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X-WR-CALNAME:EE
X-ORIGINAL-URL:https://ee.iisc.ac.in
X-WR-CALDESC:Events for EE
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TZID:Asia/Kolkata
BEGIN:STANDARD
TZOFFSETFROM:+0530
TZOFFSETTO:+0530
TZNAME:IST
DTSTART:20230101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240613T160000
DTEND;TZID=Asia/Kolkata:20240613T173000
DTSTAMP:20260404T041659
CREATED:20240605T042540Z
LAST-MODIFIED:20240605T042540Z
UID:241477-1718294400-1718299800@ee.iisc.ac.in
SUMMARY:EE Talk on Advancements in Power Electronics for Sustainable and Resilient Energy Systems.
DESCRIPTION:Title: Advancements in Power Electronics for Sustainable and Resilient Energy Systems.\n \nSpeaker: Prof Avik Bhattacharya \nIIT Roorkee \n \nDate 13/6/2024\n \nTime: 4:00 pm\n \nVenue: MMCR EE\n \nAbstract: This talk delves into the pivotal role of power electronics in advancing the sustainability\, reliability\, and efficiency of modern energy systems. Key topics include sustainable microgrids\, which utilize advanced power electronic converters to seamlessly integrate renewable energy sources and storage systems for resilient\, self-sufficient power solutions. The presentation addresses power quality improvement techniques\, leveraging power electronics to mitigate issues such as voltage sags\, harmonics\, and frequency variations\, ensuring stable and high-quality power delivery. The development of multilevel solar inverters\, which enhance photovoltaic system efficiency and reduce electromagnetic interference\, will be explored\, showcasing their design and operational benefits. The rapid expansion of electric vehicles (EVs) underscores the necessity for efficient fast charging infrastructure\, where power electronics play a crucial role in reducing charging times and enhancing the reliability of charging networks. Lastly\, the discussion highlights resilient space converters\, emphasizing innovative power electronic designs that ensure robustness against extreme conditions and cyber threats. Integrating these cutting-edge power electronic technologies significantly advances the pursuit of a more sustainable\, reliable\, and resilient energy future.
URL:https://ee.iisc.ac.in/event/ee-talk-on-advancements-in-power-electronics-for-sustainable-and-resilient-energy-systems/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240610T110000
DTEND;TZID=Asia/Kolkata:20240610T130000
DTSTAMP:20260404T041659
CREATED:20240606T110915Z
LAST-MODIFIED:20240610T034655Z
UID:241479-1718017200-1718024400@ee.iisc.ac.in
SUMMARY:Thesis defense on Estimation of flashovers in the EHV/UHV lines on the east coast due to lightning produced by the Bay of Bengal cyclones
DESCRIPTION:Name of the Candidate:  Anirban Chatterjee \nTitle of the Thesis:         Estimation of flashovers in the EHV/UHV lines on the east coast due to lightning produced by the Bay of Bengal cyclones \nDegree Registered:         MTech (Res) in Electrical Engineering \nTime and date:              11.00 AM\, 10th June 2024 \nVenue         :               MMCR Seminar Hall of EE Department \n                                    Meeting Link \nResearch Supervisor:      Udaya Kumar \nAbstract \nThe Bay of Bengal produces a considerable number of cyclones. Many of them invade the east coast of India. They can cause structural damage to towers\, substation flooding\, and conductor snapping. In many cases\, lightning causes several flashovers on the EHV/UHV grid and they are much more in numbers than the former. However\, no serious effort was made to estimate the possible number of flashovers caused by the lightning produced by such cyclones. The present work aims to fill this serious gap. \nEstimating such lightning-induced flashovers requires several aspects\, both electrical and cyclone-related. The lightning strike could be intercepted by the tower/ground wire\, or it can strike the phase conductor. The electro-geometric model (EGM)\, suggested in IEEE standards\, is employed to assess the normalized number of strokes striking the phase conductor and intercepted by the tower/ground wire. The associated probabilities are also estimated for typical EHV and UHV lines. \nThe simulations are carried out by modeling the lines in EMTP with a multi-story model for the tower and the voltage rise in the system is evaluated. Using this information and the BIL of the line\, the possibility of flashovers is assessed. \nThe cyclone’s trajectory\, the speed\, and the number of lightning flashes produced by them are assimilated from different sources. Modeling the cyclone as a disc like structure\,\, the line length shadowed as a function of time is calculated. In addition\, equivalent ground flash density per square km per hour is also calculated. Combining all this information\, the possible number of lighting-induced flashovers in the EHV/UHV grid along the East Coast is estimated.  It amounts to 100s of flashover in 400 kV lines and 1000s of flashover in 220kV line. \nFor engineering purposes\, the maximum number of possible flashovers are required. Based on the maximum number of ground flashes per hour across the cyclones for five years\, it was estimated. It amounts to a few to a few tens of flashovers in 765kV grid\, a few tens to a few hundred in 400kV grid and that for 220kV grid\, it amounted to a few hundred to a few thousands.
URL:https://ee.iisc.ac.in/event/thesis-defense-on-estimation-of-flashovers-in-the-ehv-uhv-lines-on-the-east-coast-due-to-lightning-produced-by-the-bay-of-bengal-cyclones/
LOCATION:Multi-Media Class Room (MMCR)\, EE Department (Hybrid mode)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240604T150000
DTEND;TZID=Asia/Kolkata:20240604T170000
DTSTAMP:20260404T041700
CREATED:20240603T044534Z
LAST-MODIFIED:20240603T044534Z
UID:241475-1717513200-1717520400@ee.iisc.ac.in
SUMMARY:Faculty Candidate Talk on Blind speaker separation from noisy speech mixtures
DESCRIPTION:Faculty Candidate Talk\nTitle: Blind speaker separation from noisy speech mixtures\nDate and Time: 3:00 PM: 4th JUNE\, 2024.\nLocation: MMCR\, EE dept (Online link)\n\nAbstract:\nBlind separation of speech mixtures into individual speaker signals is crucial for several speech processing applications\, including teleconferencing. These applications require blind speech separation (BSS)\, i.e.\, without any additional information about the speakers in the mixture or their count\, for both transcription and communication. This task becomes particularly difficult when the number of speakers in the mixture is unknown and recordings are made using a single microphone. In a recent work\, we developed a deep-learning-based system for BSS from noisy single-channel mixtures\, with an unknown number of speakers in the mixture. The work employs a transformer-based neural network architecture with an attractor generation scheme\, allowing it to count the speakers and separate their signals simultaneously. In my presentation\, I will share the results from experimental validation on simulated speech mixtures. Our findings show that the system can achieve 18 dB or more improvement in signal-to-distortion ratio and 99% accuracy in speaker counting for mixtures with up to three speakers. Additionally\, I will also discuss the insights gained into the model’s internal mechanics\, by examining the attention patterns computed in the transformers. We also observed that these findings apply universally across different transformer configurations used in other tasks\, such as ambisonic-to-ambisonic and multi-channel speech separation.\n\n\nBio: Srikanth Raj Chetupalli received the Master of Engineering and Doctor of Philosophy degrees from the Division of Electrical Sciences\, Indian Institute of Science (IISc.) Bengaluru\, India\, in 2011 and 2020\, respectively. He is currently a Postdoctoral Researcher with the International Audio Laboratories Erlangen (a joint institution of the Friedrich-Alexander-Universität Erlangen-Nürnberg and Fraunhofer Institute for Integrated Circuits IIS)\, Erlangen\, Germany. His research interests include speech processing\, multimicrophone processing\, spatial audio processing\, and in particular\, source extraction\, speech dereverberation\, acoustic parameter estimation\, and speaker diarization. He was the recipient of the Tata Consultancy Services Research Scholarship from 2015 to 2019.
URL:https://ee.iisc.ac.in/event/faculty-candidate-talk-on-blind-speaker-separation-from-noisy-speech-mixtures/
LOCATION:Multi-Media Class Room (MMCR)\, EE Department (Hybrid mode)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240524T100000
DTEND;TZID=Asia/Kolkata:20240524T120000
DTSTAMP:20260404T041700
CREATED:20240520T110420Z
LAST-MODIFIED:20240520T110420Z
UID:241470-1716544800-1716552000@ee.iisc.ac.in
SUMMARY:Ph.D. Thesis Colloquium of Baby Sindhu A. V.
DESCRIPTION:Colloquium \n\nCandidate’s Name       :  BABY SINDHU A V \nDegree Registered      :  Ph.D. \nDate  & Time                :   24th May 2024 @ 10.00 AM \nVenue                            :   Seminar Hall\, High Voltage Lab and in Teams Link \nTitle                               :  Developmental Studies on Polymeric Nano/Micro Composite \n                                      Insulation  for Various High Voltage  Power Applications \n\nAbstract \n  \nThe  demand for electrical  power is increasing  day by day  necessitating a higher voltage level for power transmission. Also the development of high speed rails \, electric vehicles\, more electric aircrafts and all electric ships  call  for improvement in electric motor capacity in those vehicles. Also the use of cast resin type dry transformers in high moisture area and confined area is increasing since it is more reliable in extreme conditions and also they require less maintenance. All these applications demand for  better insulating materials which can address all the above issues cost effectively. In  recent years\,  the use of  polymeric insulating material  in HV power apparatus is increasing. Hence this study focuses on the development of polymeric  composite insulating  material  with better performance for various electrical power applications. \nSilicone rubber is a  preferred  material for use as weathershed material in outdoor polymeric insulators used in high voltage power transmission lines.   The tracking & erosion on the insulator surface due to the electrical discharges  and corona cutting  of the insulator surface  are the main issues related to outdoor polymeric insulators and these are  addressed in this study.   Tracking and erosion performance of silicone rubber filled with nano/micro fillers of different loadings is  analysed using Inclined Plane Test (IPT) as per IEC 60587.  A computational study on the behavior of the samples subjected to  tracking  is also done and the same is verified with the experimental results obtained in this work. Corona ageing studies are done by ageing the samples in a corona chamber for 25 hours. Hydrophobicity changes\, crack width formation and erosion performance after corona ageing are evaluated. An effort is made to correlate the value of leakage current to the eroded mass and a reliable online condition monitoring tool is also developed as a part of the thesis work. \n   Again\, epoxy is extensively used in  many  electrical  power apparatus such as ground wall insulation of the high voltage rotating machines\, as spacer material  in Gas Insulated Substations (GIS)\, as solid insulation in dry type transformers etc. Heat dissipation is an important area of concern when using  epoxy as ground wall insulation in rotating machines and as an insulation in  cast resin dry type transformer. The performance of epoxy filled with nano/ micron sized fillers are  investigated in this study in terms of their heat removal capacity and at the same time  retaining their dielectric properties. The improvement in thermal conductivity is correlated with the performance of various composites developed. The formation of track in the ground wall insulation and the failure of the machine is a major issue as far as rotating machines are considered. Hence the tracking time of various epoxy composites are observed and compared. The initiation of a faint track on the surface of the insulator is monitored with the help of a ratio of third harmonic component to the fundamental component. This ratio can be used as an efficient condition monitoring tool for rotating machines by measuring the leakage current online. \n    In summary polymeric composite insulating  materials based on silicone rubber and epoxy with different fillers and loadings and having   better electrical and thermal performance than the conventional materials  are developed in this study.
URL:https://ee.iisc.ac.in/event/ph-d-thesis-colloquium-of-baby-sindhu-a-v/
LOCATION:High Voltage Lab Seminar Hall (Hybrid mode)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240520T110000
DTEND;TZID=Asia/Kolkata:20240520T130000
DTSTAMP:20260404T041700
CREATED:20240520T110840Z
LAST-MODIFIED:20240520T110840Z
UID:241473-1716202800-1716210000@ee.iisc.ac.in
SUMMARY:PhD Colloquium
DESCRIPTION:Title of Thesis:   Frequent Episode Mining: Efficient Discovery Algorithms and Significance Analysis \nSpeaker:     Mr. Santhosh B. Gandreti \nDate/Time:     Monday 20th May 2024\n11:00 AM \nVenue:    MMCR\, EE Department \nResearch Supervisor:   Prof. P. S. Sastry \nAbstract: \nFrequent Pattern Mining is a popular area of data mining aimed at discovering interesting patterns that occur often in a given data. These patterns represent structures encapsulating correlations and dependencies among data elements. This thesis focuses on frequent episode mining which is aimed at discovering temporal patterns known as episodes in sequential data of event sequences. \nEpisodes are collections of event-types constrained by a partial order.  An episode is frequent if its number of occurrences exceeds a user-defined threshold.  Techniques for mining episodes employ either Breadth-First Search (BFS) or Depth-First Search (DFS) approaches to navigate the episode space. The talk begins by giving a brief introduction to frequent episode mining and various algorithms dealing with discovery of frequent episodes. \nThe talk next discusses a novel DFS algorithm for discovering injective general episodes and chain episodes\, which are two broad subclasses of episodes. The proposed algorithms are more efficient compared to the state-of-art as demonstrated by empirical results. The talk next considers more complex patterns called episodes with simultaneous events\, where the episodes contain multiple event-types at the same time instant. A novel BFS algorithm is presented for discovering serial episodes with simultaneous events. Through simulations on both synthetic and real data sets\, the effectiveness and efficiency of the proposed algorithm is demonstrated. \nThe next part of the talk discusses significance analysis that assesses the statistical relevance of episodes and presents two novel approaches for significance analysis; one for non-overlapped occurrences under Markov-null hypothesis and the other for minimal occurrences under IID-null hypothesis. This analysis helps determine an episode-specific frequency threshold for the episode to be statistically  significant\, providing a more nuanced understanding of pattern relevance. For both the above mentioned cases\, specialized Markov chains capturing the occurrences of interest are derived for a given episode\, which help in computing episode-specific thresholds on frequency\, to access its significance. Effectiveness of the proposed methods is confirmed through empirical studies.
URL:https://ee.iisc.ac.in/event/phd-colloquium/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240508T103000
DTEND;TZID=Asia/Kolkata:20240508T113000
DTSTAMP:20260404T041700
CREATED:20240507T042856Z
LAST-MODIFIED:20240507T042941Z
UID:241466-1715164200-1715167800@ee.iisc.ac.in
SUMMARY:Open  Ph.D. Thesis Defense of Mr. Ranashree Ram
DESCRIPTION:Ph.D. Thesis Open Defense \nStudent Name          :     Ranashree Ram \nThesis Title              :     Developmental Studies on a Multistage Induction Coilgun-Based Electromagnetic  \n                                        Launcher \nPlace                        :     High Voltage Lab Seminar Hall / MS Teams \nDate & Time           :     8th May 2024\, 10.30 AM \nMicrosoft Teams Link  \nAbstract \nThe archetypal chemical propellant-based launchers (e.g.\, guns\, missiles\, spacecraft launchers\, etc.) with their hot trailing plume has been widely deployed over the decades for various applications. However\, because of certain disadvantages of these systems and the physical limitations associated with their designs\, electromagnetic launchers (EMLs) seem to offer an alternative way forward as the next-generation hypervelocity (>3 km/s) launchers. The multistage induction coilgun is one such futuristic class of EMLs that works on the principle of electromagnetic induction between an array of coils (or drive coils)\, which are wound on a long barrel of appropriate length\, and an electrically conducting projectile (or armature) placed inside the barrel. Previously charged high-voltage capacitor banks are sequentially discharged into the coils through solid-state switches leading to the generation and flow of very high pulsed currents (kA) through the coils. Time-varying magnetic flux thus produced by the pulsed currents through the coils interact with the projectile inside and induce a resultant current on it. The propulsive electromagnetic force exerted on the projectile is a product of the current through the coil\, the induced current on the projectile\, and the mutual inductance. The “turn on” and “turn off” of the coils of the various stages must be precisely and appropriately synchronized during the multistage operation to achieve a higher projectile velocity and this makes its successful design and operation a challenge. Owing to its high confidentiality in defense and space applications\, not much can be known from the published works. In the present work a four-stage induction coilgun has been designed and developed in the laboratory. The research work presented in the thesis aims to understand the factors contributing to achieving a higher muzzle velocity for a projectile of a given mass while launching a payload with the coilgun. The projectile of a coilgun can be either sleeve-type (ring-shaped projectile) or solenoid-type (multi-turn projectile). \nThe author also designed and fabricated a high-speed infrared transmitter-receiver-based sensor (with 25 ns rise and fall time) to quickly sense the moving projectile (or armature) inside the barrel. The triggering instant of the subsequent stage coils of a multistage coilgun critically depends on the projectile’s position inside the barrel. The projectile will fail to achieve the highest muzzle velocity if the subsequent stage coils are not optimally triggered in a sequence. The fast-moving projectile through the barrel necessitates the fast sensing of its position inside the barrel. In addition\, the author has also designed\, developed\, and fabricated a high-speed gate driver circuit with a peak 25 kV DC isolation for the signal circuit from the high voltage power circuit within a compact space of the printed circuit board (PCB) to trigger the high-voltage SCRs used for triggering the pulsed power source of each stage of the coilgun.. \nThe large current flowing through each stage coil creates EMI problems in the coilgun. The EMI issues corrupt the sensor data\, which prevents successful sensing of the projectile’s position. Also\, EMI causes the SCRs to trigger the coils spuriously even when the projectile has not reached its optimal triggering position inside the coil. Synchronizing the triggering of stages by preventing the EMI issues is a significant challenge and is very important in successfully operating a multistage induction coilgun. The author could successfully synchronize the stages of the coilgun by preventing spurious triggering of the SCRs using appropriate EMI mitigation techniques. \n The influence of the capacitance of the capacitor bank used in the high voltage pulsed power supply on the optimum triggering position of the projectile inside the drive coil of the coilgun has been analyzed. An empirical relationship between the projectile velocity and the charging voltage of the capacitor bank has been formulated for the first time in this thesis. The subject of the study presented in this thesis also focuses on analyzing the parameters on which the efficiency of an induction coilgun depends and how it can be optimized. Study has been performed to optimize the shape and dimensions of the projectile to achieve the highest muzzle velocity. The dependency of the projectile motion on the flow of induced current in the subsequent stages has been analyzed. The study also focuses on establishing an approach to choosing a proper distance between the stages in a multistage induction coilgun. \nA comprehensive and explicit analysis has been performed to study and explain the reasons behind the differences in the optimum triggering positions of the projectile inside each stage coil and the achieved muzzle velocities for different arrangements of the drive coil current directions in a multistage induction coilgun.
URL:https://ee.iisc.ac.in/event/open-ph-d-thesis-defense-of-mr-ranashree-ram/
LOCATION:High Voltage Lab Seminar Hall (Hybrid mode)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240423T103000
DTEND;TZID=Asia/Kolkata:20240423T113000
DTSTAMP:20260404T041700
CREATED:20240422T042104Z
LAST-MODIFIED:20240422T045632Z
UID:241458-1713868200-1713871800@ee.iisc.ac.in
SUMMARY:Defense Talk on Investigating Neural Mechanisms of Word Learning and Speech Perception
DESCRIPTION:Title \nInvestigating Neural Mechanisms of Word Learning and Speech Perception: Insights from Behavioral\, Neural\, and Machine Learning Perspectives \nSpeaker: Ms. Akshara Soman \nTime: 1030am-1130am \nVenue: MMCR\, EE\, C241 and on the Teams-Meeting-Link\n\n\nAbstract \nThe process of language learning and speech perception is a remarkable feat of the human brain\, involving complex neural mechanisms that allow us to understand and communicate with one another. By employing a multidisciplinary approach\, this talk sheds light on the underlying processes involved in word learning and speech perception. \nThe talk begins by examining how imitation of sounds influences language learning and language discrimination using EEG signals. Results show that time-frequency features and phase in the EEG signal contain information for language discrimination. Further experiments confirm these findings and analyse improvements in pronunciation over time\, identifying frontal brain regions involved. \nThe talk then discusses how learning patterns change when semantics are introduced. Participants learn Japanese words and undergo ERP analysis\, revealing distinct EEG patterns for newly learned words. Notably\, a delayed P600 component emerges\, suggesting short-term memory processing.  Based on the above neuro-behavioural experiments\, a machine model is proposed to compare human-machine performances in audio-visual association learning. The model performs comparable to humans in learning with few examples\, with slightly inferior generalisation abilities. \nMoving to naturalistic stimuli\, the talk analyses continuous speech perception using a deep learning model. This model achieves 93% accuracy in stimulus-response modelling on a speech-EEG dataset\, surpassing previous efforts. It demonstrates the role of word-level segmentation during speech comprehension in the human brain.   We further extend this study to investigate speech perception in complex listening environments where multiple speech streams are heard simultaneously. Our proposed model\, based on Long Short-Term Memory (LSTM)\, reveals that the human brain prioritises understanding the semantics rather than the acoustics under such challenging listening conditions. The proposed model has potential applications in speech recognition\, brain-computer interfaces\, and attention studies. \nOverall\, the thesis enhances our understanding of language learning\, speech comprehension\, and the neural mechanisms involved. It provides insights into familiar and unfamiliar language processing\, semantic effects\, audiovisual learning\, and word boundaries in sentence comprehension. These findings have implications for both human language learning and the development of machine systems aimed at understanding and processing speech. \n Coffee/Tea will be served before the talk.
URL:https://ee.iisc.ac.in/event/defense-talk-on-investigating-neural-mechanisms-of-word-learning-and-speech-perception/
LOCATION:Multi-Media Class Room (MMCR)\, EE Department (Hybrid mode)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240423T093000
DTEND;TZID=Asia/Kolkata:20240423T113000
DTSTAMP:20260404T041700
CREATED:20240412T111613Z
LAST-MODIFIED:20240412T111613Z
UID:241445-1713864600-1713871800@ee.iisc.ac.in
SUMMARY:Colloquium On Plasma activated/assisted solid wastes in diesel exhaust treatment: a case study with agricultural\, industrial and composite wastes
DESCRIPTION:Name of the candidate: Ms. Apoorva Sahu \nResearch Supervisor:     BS Rajanikanth \nDegree Registered:        PhD \nDepartment:                   Electrical Engineering \nTitle of the Thesis:         Plasma activated/assisted solid wastes in diesel exhaust treatment: a case study with agricultural\, industrial and composite wastes \nTime and Date:               9.30 AM\, 23rd April 2024 (tuesday) \nVenue:                            High Voltage building seminar hall \nSynopsis \nThe consumption of crude oil is increasing every day particularly in developing countries like India which is the third largest consumer of crude oil in the world\, utilizing on an average around 160 million litres per annum of which 30% constitutes diesel fuel. More than 50% of the NOx and hydrocarbons in air come from the diesel exhaust affecting the health of human beings\, vegetation\, and environment. While the solid particulate in the exhaust is taken care to a greater extent by the mechanical filters it is the gaseous pollutants such as oxides of nitrogen (NOx)\, oxides of carbon\, hydrocarbons (HC) etc.\, that need to be addressed as they cause several health-related ailments in addition to acid rain\, global warming\, smog etc. It is timely to work on the development of economical and efficient pollution control strategies. On the other hand\, issues that is affecting our country India currently are accumulation of wastes from utility industry\, mariculture industry and agriculture industry. The prominent amongst them are fly ash\, red mud\, foundry sand\, iron ore tailings\, lignite ash\, rice husk\, wheat straw and sugarcane bagasse etc. Accumulation of these wastes are in several million tons per annum in India. Any proposition in recycling waste is a welcoming step. \nEfforts are continuously being made for the past three decades to mitigate these gaseous pollutants\, particularly NOx\, at various levels by changing the fuel composition\, engine modifications\, pre-combustion techniques and post-combustion (aftertreatment) techniques. The existing post-combustion mode technique “catalyst-based converters and adsorbent based techniques” are becoming expensive owing to the short life\, dependency on noble metals\, more vulnerability to acidic coating\, bulk usage of adsorbents etc. In this regard the application of non-thermal plasma or electric discharge plasma for pollution control aided by additional techniques is slowly gaining popularity in the past few years. Discharge plasma ionizes the atoms at normal temperature and atmospheric pressure (NTP) thus creating an oxidative environment resulting in chemical reactions such as reduction\, oxidation\, decomposition etc. However\, among these reactions it was observed that oxidation was dominating\, to a certain extent the oxidised by-products in the plasma appeared to be less hazardous to humans than to nature. This led to the redesigning of plasma reactors with the intention of enhancing the energy in the charged species favouring reduction reactions instead of oxidation ones but not without serious limitations with respect to the gas flow. \nApplication of electrical discharges for environmental purposes lies in the basic concept of treating the pollutants\, particularly the gaseous ones\, with plasma excited species. It is observed that plasma alone is insufficient for the successful treatment of any of the gaseous pollutants due to the oxidative environment prevailing in the discharge plasma at atmospheric conditions. This necessitated inclusion of additional treatment technique along with plasma leading to the origin of plasma catalysis/plasma adsorption methods where in the catalytic materials were kept inside the plasma environment (plasma catalysis) or the adsorbent materials are cascaded with plasma (plasma adsorption). It should be noted here that the total cost involved in the proposed technique\, should be lower than that associated with conventional catalyst-alone or adsorbent-alone techniques so that the proposed ones can be a promising economic alternative to the conventional ones. That said\, cascading commercially available catalysts/adsorbent with plasma can never be a cheaper alternative. Several research works\, therefore\, started by blending plasma with other lab made catalysts/adsorbents but the DeNOx efficiency was not significant. \nPresent work aimed at studying the NOx abatement in diesel engine exhaust at controlled laboratory condition using electrical discharges. The intention of the study is to provide not only an efficient but also an economical solution for reduction of the NOx pollutants. Keeping this in mind\, it was decided to utilize electrical discharge technique in association with abundantly available solid wastes in India be it from industrial\, mariculture or agriculture domains. Given the whole spectrum of parametric variations the thesis plan was carefully drawn to touch upon the following variations: type of corona electrodes\, type of applied high voltage\, type of solid wastes\, type of gas treatment. Four types of electrodes were studied that include needle plate\, metal film\, helical wire and pipe type. Type of voltage involves fast rising repetitive pulses at 80 Hz\, power frequency and high frequency AC. The solid wastes comprise of three categories namely (a) industrial/mariculture wastes that include namely iron tailings\, lignite ash\, red mud\, foundry sand\, waste tiles and copper slag\, oyster shell (b) agricultural wastes including coffee husk\, sugarcane waste\, mulberry husk\, rice husk\, ragi husk\, corn husk\, wheat husk\, pine\, ground nut and areca nut husk and (c) composite wastes which include a blend of waste tiles + foundry sand\, copper slag + red mud\, iron tailings + waste tiles\, red mud + waste tiles\, foundry sand + red mud and foundry sand + iron tailings. The type of gas treatment involves treating the exhaust with only plasma/plasma catalysis/plasma adsorption/thermal catalysis utilizing catalytic properties of metal oxides present in the industry wastes or porous nature of the industry wastes. A comparison was also made by replacing the industrial wastes with commercial NOx catalysts. Important contribution of this research work can be summarized as: (a) with plasma catalysis approach the NOx removal efficiency gets enhanced by a factor of 5.3-6.7 compared to only plasma. (b) with plasma adsorption approach the NOx removal efficiency gets enhanced by a factor of 4-6 compared to only plasma. (c) Fe2O3/TiO2 present in red mud can act as photo catalysts in oxidizing NO through plasma generated ethyl nitrate in the plasma cascaded red mud adsorption process (d) Amongst the agricultural wastes\, ground nut husk-based pellets exhibited 83% NOx removal efficiency (e) The newly developed metal film based DBD reactor enhances surfaces discharges far better than the helical wire reactor (f) commercial catalysts performed much better in NOx removal under plasma catalysis mode when compared to thermal catalysis mode. Further\, plasma catalysis with industrial wastes such as iron tailings and oyster shell yielded better/similar DeNOx efficiency when compared to that with commercial NOx catalysts thus\, justifying the usage of cheaper industrial wastes instead of expensive commercial ones.
URL:https://ee.iisc.ac.in/event/colloquium-on-plasma-activated-assisted-solid-wastes-in-diesel-exhaust-treatment-a-case-study-with-agricultural-industrial-and-composite-wastes/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240415T150000
DTEND;TZID=Asia/Kolkata:20240415T170000
DTSTAMP:20260404T041700
CREATED:20240412T111144Z
LAST-MODIFIED:20240412T112129Z
UID:241443-1713193200-1713200400@ee.iisc.ac.in
SUMMARY:Colloquium on Development of Pulsed Power Systems and Tooling Coils for Electromagnetic Manufacturing Applications
DESCRIPTION:Title: Development of Pulsed Power Systems and Tooling Coils for Electromagnetic Manufacturing Applications \nSpeaker: DEEPAK KAUSHIK . of Ph.D. (Engg) in Electrical Engineering under Electrical Engineering \nDate/Time: April 15 / 15:00:00 \nLocation: HV Lab Seminar Hall \nResearch Supervisor: Joy Thomas M \nAbstract:\nElectromagnetic pulse manufacturing is an emerging non-conventional manufacturing technique used for the forming of workpieces at very high strain rates. The manufacturing assembly consists of the tooling coil (or actuator)\, the workpiece\, a pulsed power source\, and finally\, a suitable die as per the required final shape that needs to be achieved. In this work\, the author focuses on developing high voltage and high current pulsed power sources as well as the tooling coils required for the electromagnetic forming applications. The study encompasses theoretical simulations and practical experiments pertaining to electromagnetic forming applications involving workpieces made of sheet metal and tubular structures. Electromagnetic forming is a complex multi-physics process that involves electromagnetic\, thermal\, and mechanical fields which are strongly coupled to each other. Initially\, the author focused on understanding the interaction between various physical fields involved and development of fast analytical methods to predict the deformation in the workpiece due to their interaction. Impact velocity and the pressure applied to the workpiece are critical aspects that determine the workpiece’s deformation. Based on the developed coupled models\, the author has proposed techniques to control the impact velocity and the applied pressure on the workpiece and designed the Pulsed Power Systems to achieve the same. The tooling systems are the most vital components in the electromagnetic forming process. This is because they generate the necessary pressure on the workpiece to achieve the final desired shape. The author has designed and developed various tooling coil assemblies for sheet metal forming and operations on tubular workpieces. The author has developed a novel clamp-on type electromagnetic tooling coil for agile manufacturing of tubular components. The designed actuator offers several advantages over conventional helical tooling systems\, including a pressure distribution which does not produce any end effects as opposed to the pressure on the workpiece dropping to 58% of the peak in a conventional helical actuator. It is also marginally less sensitive to standoff distance\, where the reduction in the peak pressure is only 13% as compared to the conventional actuator\, which shows a drastic drop of 56% as the standoff distance varies from 2 mm to 5 mm. The proposed clamp-on tooling coil is also robust to failure as the stress on the proposed actuator is compressive and reinforces it against the toroidal former. In contrast\, the stress on the conventional helical actuator coil is repulsive\, requiring external reinforcements. The proposed actuator is openable and can be reused easily for repeated applications. For sheet metal forming\, the author optimized the uniform pressure actuator and proposed a high-efficiency dual-channel uniform pressure tooling coil (UPTC). The salient features of the designed dual-channel actuator are as follows. The designed tooling coil draws 6.2% more current and applies 24.9% more force than the conventional UPTC for the same pulsed power source parameters. The spatial distribution of the pressure is identical in both the tooling coils\, but the magnitude of the pressure in the proposed dual-channel tooling coil is about 23% higher. In addition\, the proposed tooling coil also has better capabilities for handling electromagnetic stress during the forming process. For the first time\, the author has integrated attractive and repulsive sheet metal forming technology into a single assembly. The author introduces a novel design and analysis of a dual-mode universal uniform pressure tooling coil that integrates both forming techniques\, simplifying the requirements for the pulsed power system. Finally\, the author has studied the effect of tooling coil designs on the efficiency of the forming process. The study aims to find the effect of coil design on the forming efficiency and compares the performance of multi-turn and multi-layer coils over the existing tooling coils. The study has been validated using the development of multi-layered uniform pressure tooling coils with experiments performed on free bulging of AA-6061-T6 sheets. The author found that the multi-layered tooling coils outperformed the single-layered wire-wound coils for all values of the system capacitances used. \nMeeting Link 
URL:https://ee.iisc.ac.in/event/colloquium-on-development-of-pulsed-power-systems-and-tooling-coils-for-electromagnetic-manufacturing-applications/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240412T160000
DTEND;TZID=Asia/Kolkata:20240412T173000
DTSTAMP:20260404T041700
CREATED:20240412T043837Z
LAST-MODIFIED:20240412T043837Z
UID:241439-1712937600-1712943000@ee.iisc.ac.in
SUMMARY:Talk On Making Machine Learning Models Safer and Better: Data and Model Perspectives
DESCRIPTION:  \nAbstract: As machine learning systems are increasingly deployed in real-world settings like healthcare\, finance\, and scientific applications\, ensuring their safety and reliability is crucial. However\, many state-of-the-art ML models still suffer from issues like poor out-of-distribution generalization\, sensitivity to input corruptions\, requiring large amounts of data\, and inadequate calibration – limiting their robustness and trustworthiness for critical real-world applications. \nIn this talk\, I will present a broad overview of different safety considerations for modern ML systems. I will then proceed to discuss our recent efforts in making ML models safer from two complementary perspectives – (i) manipulating data and (ii) enriching the model capabilities by developing novel training mechanisms. First\, I will discuss our work on designing new data augmentation techniques for object detection followed by demonstrating how\, in the absence of data from desired target domains of interest\, one could leverage pre-trained generative models for efficient synthetic data generation. Next\, I will introduce a new paradigm of training deep networks called model anchoring and show how one could achieve similar properties to an ensemble but through a single model. I will specifically discuss how model anchoring can significantly enrich the class of hypothesis functions being sampled and demonstrate its effectiveness through its improved performance on several safety benchmarks. Finally\, I will present our efforts in proactively identifying samples on which a model would fail through a novel model counterfactual synthesis technique by leveraging foundation models (e.g.\, GPT family and CLIP). I will then conclude by highlighting exciting future research directions for producing robust ML models through leveraging multi-modal foundation models. \n\nBio: Kowshik Thopalli is a Machine Learning Scientist and a post-doctoral researcher at Lawrence Livermore National Laboratory. He is currently mentored by Dr. Jay Thiagarajan. His research focuses on developing reliable machine learning models that are robust under distribution shifts. He has published papers on a variety of techniques to address model robustness\, including domain adaptation\, domain generalization\, and test-time adaptation using geometric and meta-learning approaches. His expertise also encompasses integrating diverse knowledge sources\, such as domain expert guidance and generative models\, to improve model data efficiency\, accuracy\, and resilience to distribution shifts. He received his Ph.D. in 2023 from Arizona State University under the mentorship of Dr. Pavan Turaga.\n______\n\nAll are welcome.
URL:https://ee.iisc.ac.in/event/talk-on-making-machine-learning-models-safer-and-better-data-and-model-perspectives/
LOCATION:B306 \, EE Dept
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240412T093000
DTEND;TZID=Asia/Kolkata:20240412T110000
DTSTAMP:20260404T041700
CREATED:20240409T063344Z
LAST-MODIFIED:20240409T063642Z
UID:241435-1712914200-1712919600@ee.iisc.ac.in
SUMMARY:Colloquium on  Estimation of flashovers in the EHV/UHV lines on the east  coast due to lightning produced by the Bay of Bengal cyclones
DESCRIPTION:Name of the Candidate:       Anirban Chatterjee \nTitle of the Thesis:              Estimation of flashovers in the EHV/UHV lines on the east coast due to lightning produced by the Bay of Bengal cyclones \nDegree Registered:                MTech (Res) in Electrical Engineering \nTime and date:                     9.30 AM\, 12th April 2024 \nVenue:                                   High Voltage Laboratory Seminar Hall of EE Department \nResearch Supervisor:           Professor Udaya Kumar \nAbstract \nThe Bay of Bengal produces a considerable number of cyclones. Many of them invade the east coast of India. They can cause structural damage to towers\, substation flooding\, conductor snapping\, etc. In many cases\, through lightning\, they cause several flashovers on the EHV/UHV grid. However\, there is no serious effort to estimate the possible number of flashovers caused by the lightning produced by such cyclones. The present work aims to fill this serious gap. \nThe estimation of such lightning-induced flashovers requires several aspects\, both electrical and cyclone-related. The lightning stroke could be intercepted by the tower/ground-wire\, or it can strike the phase conductor. The electro-geometric model(EGM)\, suggested in IEEE standards\, is employed for assessing the normalized number of strokes striking the phase conductor and intercepted by the tower/ground-wire. The associated probabilities are also estimated for typical EHV and UHV lines. \nThe relation between the peak stroke current and the rise time is made based on the literature. Then\, by modelling the lines in EMTP with a multi-story model for the tower\, simulations are carried out to deduce the corresponding voltage rise. Using this information and the BIL of the line\, the possibility of flashovers is assessed. \nThe trajectory of the cyclone and the speed\, along with the number of lightning flashes produced by them are assimilated from different sources. Modelling the cyclone as a disc above ground\, the line length shadowed as a function of time is calculated. In addition\, equivalent ground flash density per square km per hour is also calculated. Combining all these information\, the possible number of lighting-induced flashovers in the EHV/UHV grid along the east coast is estimated.  Within three to four days the number of such flashover incidents can range from a few to few tens of flashovers within a time span of two to four days.
URL:https://ee.iisc.ac.in/event/colloquium-on-estimation-of-flashovers-in-the-ehv-uhv-lines-on-the-east-coast-due-to-lightning-produced-by-the-bay-of-bengal-cyclones/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240410T093000
DTEND;TZID=Asia/Kolkata:20240410T113000
DTSTAMP:20260404T041700
CREATED:20240408T041654Z
LAST-MODIFIED:20240408T042412Z
UID:241429-1712741400-1712748600@ee.iisc.ac.in
SUMMARY:Colloquium On Investigation Of Direct Lightning Strike To High Voltage Transmission Lines
DESCRIPTION:Name of the Candidate :      Mr. Sukesh A \nDegree Registered :               Ph.D. \nTitle of the thesis :                 Investigation Of Direct Lightning Strike To High Voltage Transmission Lines \nTime and date :                     9.30 AM\, 10th April 2024 \nVenue :                                   High Voltage Laboratory Seminar Hall \nResearch supervisor :           Udaya Kumar \nABSTRACT \nLightning continues to be the single largest natural cause of line outages. With high voltage lines spanning millions of kilometres around the globe\, it has been a serious concern to transmission line engineers. Quite unfortunately\, the lightning performance of ultra-high voltage lines falls far below that estimated from the available models. There are two reasons for this difference\, namely\, inadequacy in the present standards in evaluating the lightning attachment process and in ascertaining the surge response of these tall lines. \nThe recent progress in simulating the attachment process is dealt with in the latest CIGRE technical brochure. It is shown that the simplified model proposed over there can account for the observed differences between estimated using older models and the field data. \nDifferent modelling approaches have been employed to evaluate lightning surge response. The most popular approach in power engineering is a lumped current source in parallel with an impedance. However\, there is no consensus among researchers regarding the value of impedance to be used in such models. Based on observations over tall towers\, it has been inferred that the peak value of the lightning current depends on the strike object. Importantly\, a seven years long study based on measurements on heavily instrumented UHV lines in Japan has provided additional information that is not in line with expectations. \nAn alternative modelling approach for evaluating the lightning surge response of lines is to make use of the return stroke models. Among the different categories of return stroke models available\, only the transmission line and electrodynamic models can\, in some sense\, be employed for modelling a direct strike to the transmission line. Even though current is not assumed in the transmission line models\, the mode of propagation is assumed as TEM mode\, which is not true on the channel\, at least in the initial stages of current evolution. Even though the mode of propagation is not assumed in electrodynamic models\, usually\, a lumped excitation is assumed. \nTherefore\, a model that does not assume the excitation and the mode of propagation is essential. A self-consistent return stroke model recently proposed by the group would be an ideal tool for the required investigation. It basically emulates basic essential physical processes along with accurate tracing of dynamic electromagnetic fields using time-domain thin-wire formulation. \nIn order to apply this model to simulate a direct strike scenario to a transmission line\, the field computation methodology had to be extended from the axisymmetric to a fully three-dimensional wire geometry. Further\, wire junctions need to be considered. These were achieved and for the latter\, spatial basic function is borrowed by the Numerical Electromagnetic Code. \nUsing this extended self-consistent return stroke model\, detailed simulations are carried out for a direct strike to the transmission line. The peak current during a strike-to-phase conductor and strike-to-ground (or simplified ground wire-tower structure) are deduced. Using this consistent modelling approach\, it has been clearly shown by modelling that the peak current value for the same conditions reduces to half of that for a strike to ground/ground wire-tower structure. The physical reason for this difference has also been identified. Furthermore\, the mode of propagation of the stroke current along the phase conductor is also assessed.  In summary\, this work has delved into some of the fundamental aspects of lightning strikes.
URL:https://ee.iisc.ac.in/event/colloquium-of-mr-sueksh-9-30-am-10th-april-2024/
LOCATION:HV seminar Hall
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240404T090000
DTEND;TZID=Asia/Kolkata:20240405T170000
DTSTAMP:20260404T041700
CREATED:20240401T164553Z
LAST-MODIFIED:20240401T165252Z
UID:241422-1712221200-1712336400@ee.iisc.ac.in
SUMMARY:EECS Symposium
DESCRIPTION:The EECS division cordially invites you to the EECS Symposium on 4th & 5th April 2024. \nFor more details please see: https://eecs.iisc.ac.in/EECS2024 \nRegistration link for the event: EECS Symposium 2024 Registration Form.
URL:https://ee.iisc.ac.in/event/eecs-symposium/
LOCATION:IISc
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240326T090000
DTEND;TZID=Asia/Kolkata:20240326T110000
DTSTAMP:20260404T041700
CREATED:20240325T061036Z
LAST-MODIFIED:20240325T061324Z
UID:241418-1711443600-1711450800@ee.iisc.ac.in
SUMMARY:PhD Thesis defence on Imaging Inverse Problems
DESCRIPTION:Title : Improved Derivative-based Regularizations for Imaging Inverse   problems\n\nStudent : Manu Ghulyani\n\nAdvisor : Prof. Muthuvel Arigovindan\n\nThesis Examiner:  Prof.  Ajit Rajwade\nDepartment of Computer Science and Engineering\,\nIIT Bombay.\n\nDate and Time:   26.03.2024 (Tuesday)\,  :.9:00  am\n\nVenue :  MMCR\, Department of Electrical Engineering\n\nAlso online in Teams\n\n\n\nAbstract:\n\n\nImages undergo degradation during the capturing process due to physical limitations inherent to the capturing devices. Addressing this degradation and recovering high-quality images constitute the image recovery problem\, a crucial concern with diverse applications across various fields such as biology\, astronomy\, and medicine. The enhancement of captured image resolution significantly influences these disciplines. Examples of this problem include tasks like reconstructing computed tomography images\, magnetic resonance imaging\, image deconvolution\, and microscopic image reconstruction.\n\nImage recovery is frequently approached using regularization techniques\, with derivative-based regularizations being popular due to their ability to exploit image smoothness\, yielding interpretable results devoid of introduced artifacts. Total Variation regularization (TV)\, proposed by Rudin\, Osher\, and Fatemi\, is a seminal approach for image recovery. TV involves the norm of the image’s gradient\, aggregated over all pixel locations. As TV encourages minimal values in the derivative norm\, it leads to piece-wise constant solutions\, resulting in what is known as the “staircase effect.” To mitigate this effect\, the Hessian Schatten norm regularization (HSN) employs second-order derivatives\, represented by the pth norm of eigenvalues in the image hessian vector\, summed across all pixels. HSN demonstrates superior structure-preserving properties compared to TV. However\, HSN solutions tend to be overly smoothed. To address this\, we introduce a non-convex shrinkage penalty applied to the Hessian’s eigenvalues\, deviating from the convex lp norm. While the analytical form of this penalty was unknown\, we derived the algorithm using proximal operations. We established that the proposed regularization adhered to restricted proximal regularity\, ensuring the algorithm’s convergence. The images recovered by this regularization were sharper than the convex counterparts.\n\nIn the subsequent work\, we extend the concept of the Hessian-Schatten norm. By encompassing Schatten norms of the Hessian and introducing a smoothness constraint\, we broaden the scope of Hessian Schatten norm. The resulting regularization can be derived as a Lagrange dual of the Hessian Schatten norm\, akin to the total generalized variation. Furthermore\, we present an efficient variable splitting scheme for solving image restoration challenges.\n\nTotal Generalized Variation (TGV) represents an important generalization of Total Variation. TGV involves multiple orders of derivatives\, with higher-order TGV leading to improved recovered image quality. This enhancement has been validated through numerical experiments in image denoising. Consequently\, a demand arises for an algorithm capable of solving TGV for any order. While various methods address TGV regularization\, many are confined to second-order TGV\, and only a few explore orders greater than three for image recovery with TGV regularization. To our knowledge\, no algorithm resolves image recovery challenges employing TGV regularization for orders exceeding three under a general forward model. This challenge arises from the intricate nature of TGV representation. We surmount this obstacle by presenting two simple matrix based representations of TGV: the direct and compact forms. We prove the equivalence of both forms with the original TGV definition. Leveraging the compact representation\, we propose a generalized ADMM-based algorithm to solve TGV regularization for any order.\n\nALL ARE WECOME.
URL:https://ee.iisc.ac.in/event/phd-thesis-defence-on-imaging-inverse-problems/
LOCATION:Multi-Media Class Room (MMCR)\, EE Department (Hybrid mode)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240325T080000
DTEND;TZID=Asia/Kolkata:20240325T110000
DTSTAMP:20260404T041700
CREATED:20240313T091258Z
LAST-MODIFIED:20240313T104335Z
UID:241415-1711353600-1711364400@ee.iisc.ac.in
SUMMARY:PhD Oral Exam
DESCRIPTION:Title: Reduced Electrolytic Capacitor-Based Single-Phase Converters: Topologies\, Control\, and StabilityName of the Student: Anwesha MukhopadhyayName of the Advisor: Prof. Vinod JohnDegree Registered: Ph.D.Date and Time:  25th March\, 2024\, 08:00 AMTeams Meeting Link:Abstract: Single-phase power converters find wide applications as inverters. Applications ranging from a few hundred Watts for household solar micro-inverters\, to multi-Megawatt levels for electric traction power train\, single-phase converters are adopted worldwide.In single-phase power conversion\, there is always a mismatch between the instantaneous input and output power\, producing a second-harmonic ripple in the dc link current. Electrolytic capacitors are conventionally deployed for filtering the second-harmonic ripple due to their low cost and excellent energy density. However\, their frequent premature failures often compromise the lifespan of the converters. In recent technologies demanding high power density\, active filters have minimised the electrolytic capacitors in the circuit. However\, the cost\, efficiency\, and power density trade-offs need scrutiny before adopting an active filter topology.Among the reported active filters (AF) for second-harmonic ripple mitigation\, series capacitor stacked buffer (SSB) topology has emerged as a popular choice owing to its high efficiency and compactness. The use of low VA-rated switching devices enables achieving the high efficiency equivalent to passive filters. Despite its prospective utility in a range of applications\, the model of the SSB\, essential for implementing functional engineering control strategies under a wide range of operating conditions\, is not discussed in existing literature.In the first part of the work\, the plant model for controlling the buffer converter in voltage control mode as well as current control mode is developed. Using the proposed model\, a closed-loop control scheme is developed\, which ensures a fixed-frequency switching of the buffer converter. A step-by-step controller design procedure is elaborated\, and the controller gain limit is identified to ensure closed-loop stability.Based on the developed SSB model\, an average current mode control is implemented in the second part of the work. Unlike the existing methods of current mode control\, in the proposed scheme\, the current reference is estimated without using the dc-link current sensor\, which is verified experimentally.The SSB-based existing topologies\, though promising for many applications\, are not realised with minimum switch counts. As opposed to four switch H-bridge-based buffer converter\, two switch-based series capacitor stacked buffer converter topologies are synthesised in this part of the work. The generalised topology synthesis procedure and control challenges are identified. One of the proposed two-switch-based topologies named Series Capacitor Boost Hybrid Filter (SC-BOHF) is implemented and verified experimentally.Apart from the active solutions\, an alternative dc bus filter structure\, consisting of a combination of an inductor (L) and capacitor (C)\, tuned at the second harmonic (2ω) frequency\, reduces the capacitance requirement\, enhancing the likelihood of deployment of film capacitors. The proposed solid-state tuning restorer (SSTR) offers consistent filtering performance of the LC filter under frequency and parameter variations. As per the tuning requirement of the LC filter\, SSTR acts as an electronic inductor or capacitor. It also ensures a graceful degradation in the filter characteristics during SSTR converter failure modes. The evolution of the SSTR configuration\, analysis of its VA rating\, and control requirements are studied in this work.The realisation that SSTR requires to behave as an electronic inductor and capacitor as per the sense of LC filter detuning motivated this part of the work\, where a unified active capacitor and inductor (UACI) is proposed and implemented without using any dc capacitor. Based on the current reference\, the proposed configuration emulates inductive or capacitive characteristics and smoothly transits from one characteristic to another. The operation of the proposed UACI is studied\, and a closed-loop control scheme is developed.All the proposed methods are validated on hardware prototypes that have been developed as a part of the research.             ——————           ALL ARE WELCOME               —————
URL:https://ee.iisc.ac.in/event/phd-oral-exam/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240307T100000
DTEND;TZID=Asia/Kolkata:20240307T120000
DTSTAMP:20260404T041700
CREATED:20240305T092013Z
LAST-MODIFIED:20240305T092532Z
UID:241397-1709805600-1709812800@ee.iisc.ac.in
SUMMARY:Phd Thesis Defense
DESCRIPTION:Title: Pulse Width Modulation Techniques of Two-level Inverter Fed Asymmetrical Six-phase Machine Drive in Linear and Overmodulation Regions \nName of the Student: Sayan Paul \nName of the Advisor: Dr. Kaushik Basu \nDegree Registered: Ph.D. \nDate and Time: 07th March\, 2024\, 10:00 AM  \nTeams Meeting Link \nALL ARE CORDIALLY INVITED. \nAbstract: \nMulti-phase machines (MPMs) have more than three windings in their stator\, rotor\, or both. With the broader adoption of power-electronic converters for efficient driving of the machines\, MPMs are gaining attention in different applications due to their certain advantages over three-phase machines. One such advantage is higher fault tolerance due to having higher phase redundancy\, which makes it suitable for safety-critical applications like electric vehicles (EVs)\, ship propulsions\, electric aircraft\, etc. Another advantage is that MPMs allow power splitting across multiple phases. Hence\, the power rating per phase drive unit becomes low\, making it suitable for high-power applications like railway traction\, pumps\, compressors\, etc. Recent literature also proposes using the same multi-phase converter fed MPM\, otherwise used for propulsion\, as an onboard battery charger; it substantially reduces space\, weight\, and cost. During charging mode\, the leakage inductance of the machine provides the required inductance for the grid connection\, and MPM’s higher degrees of freedom are used to lock the rotor electronically. An asymmetrical six-phase machine (ASPM) is one of such MPMs and is very common in EVs. This thesis aims to devise the pulse-width modulation (PWM) techniques of a two-level six-phase inverter fed ASPM to improve the overall drive efficiency.  \nASPM has two sets of balanced three-phase windings\, which are spatially shifted by 30 degrees (electrical angle). In one of the popular configurations\, the two three-phase winding sets are connected in star fashion with two isolated neutral points. This machine is conventionally analyzed in two two-dimensional (2D) orthogonal subspaces. One of these subspaces is associated with electromagnetic energy transfer and torque production. The other subspace doesn’t transfer energy through the air gap and the equivalent circuit in this plane\, consisting of winding resistance and leakage inductance\, provides a low impedance. Therefore\, excitation of this non-energy-transferring subspace causes a large current and associated copper loss. Any PWM technique of ASPM aims to synthesize the desired voltages in the energy-transferring plane and minimize the applied voltage in the non-energy-transferring subspace.  \nLinear modulation techniques (LMTs) of ASPM apply zero average voltage in the non-energy-transferring subspace and synthesize the desired voltages in the energy-transferring plane on an average over a switching cycle. It is desired that these LMTs should avoid more than two switching transitions of an inverter leg within a carrier period to limit the instantaneous switching loss. Through an innovative approach\, our work finds a way to account for all possible infinitely many LMTs that follow the rule of at most two transitions per leg. But each of them results in a different current ripple performance. Ripple current is inevitable in PWM converters and should be minimized through modulation to reduce the associated copper loss. The total ripple current RMS of ASPM is contributed by both energy-transferring and non-transferring planes. One machine parameter also impacts this performance\, which is the ratio of high-frequency inductances in these two subspaces. For all reference voltage vectors and the whole feasible range of the machine parameter\, our work finds the techniques with minimum current ripple RMS among the above infinite possible LMTs through numerical optimization. A hybrid PWM strategy is proposed with these optimal techniques\, which outperforms all existing techniques in terms of current ripple performance. \nOvermodulation (OVM) techniques of ASPM attain higher voltage gain in energy-transferring subspace than LMTs by applying non-zero average voltage in the non-energy transferring subspace. This operation doesn’t cause any torque ripple\, but the applied voltage in non-energy transferring subspace should be minimized to reduce unwanted current and associated loss. The existing OVM technique in the literature minimizes this average voltage from the space-vector perspective with a pre-defined set of four active vectors. To find the best technique\, one needs to perform the above minimization problem with all possible sets of active vectors\, which can give higher voltage gain. So\, this requires the evaluation of a large number of cases. In this thesis\, we have formulated the above minimization problem in terms of average voltage vectors of two three-phase inverters\, where active vectors need not be specified beforehand. Thus\, the analysis is more general. Following the above analysis\, eight switching sequences in one part and two in another part of OVM are derived\, which attain the minimum average voltage injection in the non-energy transferring subspace. \nAlthough the above OVM sequences apply the same average voltages in the two subspaces\, they have different high-frequency ripple currents due to having different switching strategies. The current ripple study of the OVM techniques of ASPM is missing in the literature. Hence\, one of our works in the thesis studies the current ripple performances of the above PWM sequences in the OVM region\, which apply minimum average voltage in the non-energy-transferring subspace. The article finds the sequence with the best ripple performance for a given reference vector in the OVM region and the machine parameter. After that\, a PWM technique is proposed\, which substantially improves the high-frequency current ripple RMS compared to two existing OVM techniques for a feasible machine parameter. \nFinally\, simple carrier-comparison-based implementation methods of the proposed LMTs and OVM sequences will be discussed. The six-phase inverter is split into two three-phase inverters\, and the proposed strategy implements the PWM sequences per three-phase inverter basis. In carrier-based implementations\, the duty signal of the top switch of an inverter leg is compared with a triangular carrier. The bottom switch’s gating pulse complements the top switch’s pulse with a fixed dead time. The duty signal of the top switch of any leg has two components- a modulation signal and a common-mode signal. And two 180-degree phase-shifted carrier signals are required to implement the proposed sequences. The energy-transferring plane of ASPM is divided into twenty-four equivalent sectors; the carrier signals and the expressions of modulation and common-mode signals differ from one sector to another. Henceforth\, a sector-independent algorithm is proposed in this thesis to derive these signals with a lower computational burden and smaller size of program memory. \nThe above theoretical analyses are validated through MATLAB Simulink simulation and experiments on a hardware prototype at a power level of 4 kW. \n 
URL:https://ee.iisc.ac.in/event/phd/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240224T090000
DTEND;TZID=Asia/Kolkata:20240224T170000
DTSTAMP:20260404T041700
CREATED:20240219T085818Z
LAST-MODIFIED:20240222T070820Z
UID:241328-1708765200-1708794000@ee.iisc.ac.in
SUMMARY:IISc EE Open Day 2024
DESCRIPTION:Click here for IISc EE Open Day \n  \n  \n  \n  \n 
URL:https://ee.iisc.ac.in/event/iisc-ee-open-day-2024/
LOCATION:IISc
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240216T160000
DTEND;TZID=Asia/Kolkata:20240216T173000
DTSTAMP:20260404T041700
CREATED:20240207T040341Z
LAST-MODIFIED:20240207T040341Z
UID:241323-1708099200-1708104600@ee.iisc.ac.in
SUMMARY:EE Faculty Colloquium
DESCRIPTION:Title: Challenges & Opportunities in Dysarthric Speech ProcessingSpeaker: Dr. Prasanta Kumar Ghosh\, Dept of Electrical Engineering\, Indian Institute of ScienceVenue: MMCR\, EETime: 4pm\, Friday\, 16 FebAbstract:Dysarthria is a speech condition caused by motor impairments. This talk will give an overview of Dysarthric Speech Processing (DSP) arising due to Amyotrophic Lateral Sclerosis (ALS) and Parkinson’s Disease (PD). It will present our latest research results and bring out the challenges and opportunities in DSP.Speaker’s Bio:Prasanta Kumar Ghosh received his Ph.D. in Electrical Engineering from University of Southern California (USC)\, Los Angeles\, USA in 2011. Prior to that he obtained his M.Sc.(Engineering) in Electrical Communication Engineering from Indian Institute of Science (IISc)\, Bangalore and B.E.(ETCE) in Electronics from Jadavpur University\, Kolkata in 2006 and 2003 respectively. He has been a Research Intern at Microsoft Research India\, Bangalore in the area of audio-visual speaker verification from March to July in 2006. During 2011-2012 he was with IBM India Research Lab (IRL) as a researcher. Currently\, he is an assistant professor in the department of Electrical Engineering (EE) at IISc. Before joining as assistant professor\, he was a faculty fellow in the department of EE under the INSPIRE faculty fellowship program.Prasanta Kumar Ghosh was awarded the INSPIRE faculty fellowship from Department of Science and Technology (DST)\, Govt. of India in 2012. He was the winner of the first prize in Mr. BRV Varadhan Post-Graduate student paper contest in IEEE Bangalore chapter\, in 2005. He received the best M.Sc. (Engg.) thesis award for the year 2006-07 in the Electrical Sciences division at IISc. He was awarded Center of Excellence in Teaching’s award for excellence in teaching in the category of EE for the year 2010-11 in USC. He has also received the best teaching assistantship (TA) awards for the years 2007-08 and 2008-09 and the honorable mention for the best paper award in the EE\, USC. He was also awarded Ming Hsieh Institute (MHI) Ph.D. scholar for the year 2010-11 in EE\, USC. His research interests include non-linear signal processing methods for speech and audio\, speech production and its relation to speech perception\, and automatic speech recognition inspired by the speech production and perception link.————–
URL:https://ee.iisc.ac.in/event/ee-faculty-colloquium/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240206T113000
DTEND;TZID=Asia/Kolkata:20240206T130000
DTSTAMP:20260404T041700
CREATED:20240201T101134Z
LAST-MODIFIED:20240206T040039Z
UID:241319-1707219000-1707224400@ee.iisc.ac.in
SUMMARY:[EE Defense Talk]- Graph Based Approaches for Diarization of Conversational Speech\,
DESCRIPTION: The thesis defense talk of Ms. Prachi Singh (PhD candidate\, EE dept.) with the following details \nTitle Graph Clustering Approaches for Speaker Diarization of Conversational Speech \nDate and time  February 6\, 2024 (11:30am) \nVenue  MMCR\, EE\, (C241). And in Teams \nAbstract \nIn this era of advanced machine intelligence\, real-world speech applications still find it challenging to deal with conversations involving multiple speakers. An essential first step in speech information extraction from conversational speech is the task of finding “who spoke when”\, also referred to as speaker diarization. The focus of this talk is to describe our efforts in investigating graph representation learning and clustering techniques for this problem. While graph models have been used in several other domains\, our work on its application to temporal segmentation of speech is the first of its kind. \nThe talk is divided into three main parts. In the first part of this talk\, I will describe a novel proposal on self-supervised learning to perform joint representation learning and clustering\, called self-supervised clustering (SSC) for diarization. On the learned representations\, we explore path integral clustering (PIC)\, a graph-based clustering algorithm. The PIC is an unsupervised agglomerative graph clustering method that performs clustering based on the edge connections of a node\, called path integral. The proposed SSC with path integral clustering (SSC-PIC) is shown to achieve state-of-the-art performance for benchmark datasets. \nThe second part of the talk is an extension of SSC-PIC to incorporate metric learning. We design a neural version of the probabilistic linear discriminant analysis (PLDA) approach with learnable parameters to compute a log-likelihood score between embeddings from two segments of the recording.  We propose a joint self-supervised representation learning and metric learning approach called Selfsup-PLDA-PIC. \nIn the third part of the talk\, we develop a supervised learning setup using labeled conversational data for training. In this setting\, we propose a supervised clustering approach called Supervised HierArchical gRaph Clustering (SHARC) for speaker diarization. This approach uses Graph Neural Networks (GNN) to capture the similarity between the speaker embeddings and performs hierarchical clustering. An extension of this work is the joint training of the speaker embedding extractor along with the GNN module\, referred to as end-to-end SHARC (E-SHARC). I will also illustrate how to extend the E-SHARC model for diarization of overlapped speech recordings. \nThe talk will conclude with a summary of our key contributions\, highlighting the pros and cons of using graph-based models for speaker diarization. \n\n\n–—————–\nCoffee/tea will be served before the talk. All are welcome.
URL:https://ee.iisc.ac.in/event/ee-defense-talk-graph-based-approaches-for-diarization-of-conversational-speech/
LOCATION:Multi-Media Class Room (MMCR)\, EE Department (Hybrid mode)
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240129T140000
DTEND;TZID=Asia/Kolkata:20240201T153000
DTSTAMP:20260404T041700
CREATED:20240127T075025Z
LAST-MODIFIED:20240129T053328Z
UID:241314-1706536800-1706801400@ee.iisc.ac.in
SUMMARY:Lecture series on Electric Vehicles
DESCRIPTION:Dr Gautham Ram Chandra Mouli from TU Delft will visit us next week as part of an IISc-TU Delft collaborative effort. He will deliver a short (4-part) lecture series on electric vehicles from Jan 29th to Feb 1st from 2.00 pm to 3.30 pm.  \nThe venue will be Room B303 in the Department of EE. \nPlease sign up for the lecture series using the below link before 28/01/2024. \nhttps://forms.gle/8tQn5Mbaoh6s7tXdA
URL:https://ee.iisc.ac.in/event/lecture-series-on-electric-vehicles/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240124T170000
DTEND;TZID=Asia/Kolkata:20240124T180000
DTSTAMP:20260404T041700
CREATED:20240123T031947Z
LAST-MODIFIED:20240123T131734Z
UID:241307-1706115600-1706119200@ee.iisc.ac.in
SUMMARY:EE Seminar: Multicore Digital Processors in Power Electronic Applications
DESCRIPTION:Title: Multicore Digital Processors in Power Electronic Applications\n\nSpeaker: Professor Mukul Chandorkar\, IIT Bombay \nTime: 5-6 pm 24/01/2024 Wednesday \nVenue: MMCR EE IISc \nAbstract: Multicore digital processors have been available for industrial equipment control applications for several years. We will examine current state-of-the-art multicore processor offerings\, their features\, and how they fit in with demanding power electronic control applications. The use of RTOS will also be touched upon. \nAll are welcome.
URL:https://ee.iisc.ac.in/event/multicore-digital-processors-in-power-electronic-applications/
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240119T160000
DTEND;TZID=Asia/Kolkata:20240119T173000
DTSTAMP:20260404T041700
CREATED:20240117T052613Z
LAST-MODIFIED:20240117T052613Z
UID:241303-1705680000-1705685400@ee.iisc.ac.in
SUMMARY:Talk by CPRI Chair Prof Tarlochan Sidhu
DESCRIPTION:Title:  IEC Standard Enabling Digitization of Power Systems – Opportunities\, Challenges and Possible Solutions  \n  \nSpeaker: \nProfessor \nDepartment of Electrical\, Computer and Software Engineering\nFaculty of Engineering and Applied Science\nOntario Tech University\, Canada\n\nDate: 19th January 2024\, 4 PM \n  \nVenue: MMCR\, EE Dept\, IISc \n  \n\n Abstract: \nIntroduction of IEC61850 standard and related communication infrastructure has the capability to facilitate a smart grid enabling digitization and smooth integration of renewables in power systems. This standard has provided many new opportunities for improving protection\, control\, monitoring and automation functions within electric power systems. However\, there are still a number of challenging aspects that need innovative solutions not directly discussed in the standard. \nThis talk will start with an overview of the IEC61850 standard which is rapidly being applied not only in power systems but also in other areas. This will be followed by a brief description of some aspects not included in the standard and are open questions. Details of possible issues and solutions especially those related to process bus such as lost samples will be provided. Interesting and innovative improvements for protection and automation that can be achieved within the new environment using IEC61850 will be discussed. Implementation and some test results for the above-mentioned solutions and improvements will be shared.\n \nShort Biography:\nTarlochan S. Sidhu received Ph.D degree from the University of Saskatchewan\, Canada. He worked for the Regional Computer Center\, Chandigarh\, India\, Punjab State Electricity Board\, India\, and Bell-Northern Research Ltd.\, Canada. From July 1990 to June 2002\, he was with the Department of Electrical Engineering\, University of Saskatchewan\, where he served as Professor and Graduate Chairman of the Department. From July 2002 to Dec 2011\, he was Professor and Chair of the Electrical and Computer Engineering Department at the University of Western Ontario\, Canada. He also held the NSERC/Hydro One Networks Senior Industrial Research Chair in Power Systems Engineering. From Jan. 2012 to Feb 2020\, he was the Dean of Faculty of Engineering and Applied Science at the Ontario Tech University where he is currently a Professor.\n\nHe has regularly contributed to the activities of IEEE Power Systems Relaying Committee in various capacities\, and he was awarded the 2001 Distinguished Service Award of this Committee. He has published more than 300 papers in various journals and conferences\, and some of these papers have won major awards. He is regularly invited to give lectures/tutorials around the world on the subject of power system protection\, automation and monitoring. He has served regularly as a consultant to power system industries both nationally and internationally. Prof. Sidhu is a Fellow of the Institution of Engineers (India)\, a Fellow of the Institution of Engineering and Technology (U.K)\, a Fellow of the Engineering Institution of Canada\, a Fellow of the Canadian Academy of Engineering and a Fellow of the Institute of Electrical and Electronics Engineers (USA).
URL:https://ee.iisc.ac.in/event/talk-by-cpri-chair-prof-tarlochan-sidhu/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240102T160000
DTEND;TZID=Asia/Kolkata:20240102T173000
DTSTAMP:20260404T041700
CREATED:20231226T042348Z
LAST-MODIFIED:20231226T042348Z
UID:241287-1704211200-1704216600@ee.iisc.ac.in
SUMMARY:Title: Power Architecture and Battery Management Systems Research in EVTOLs (Electric Vertical Take-off and Landing)
DESCRIPTION:EE SeminarSpeaker: Prof. Abhijit KulkarniAalborg University\, Denmark.Title: Power Architecture and Battery Management Systems Research in EVTOLs (Electric Vertical Take-off and Landing)Date: Tuesday\, 2nd January 2024Time: 4.00 pmVenue: EE MMCR (C241)Power Architecture and Battery Management Systems Research in EVTOLs (Electric Vertical Take-off and Landing)Abstract:Urban air mobility (UAM) is an emerging mode of transportation that aims to reduce the traffic congestion using green technologies\, which will also reduce environmental pollution. In this presentation\, we will discuss the energy storage system and the power architecture for electric vertical take-off and landing (eVTOL) aircraft\, which are popularly under development for UAM. The energy storage system comprising of the Li-ion batteries need to be sized optimally and operated to maximize their cycle time. The presentation introduces the sizing details and a reconfigurable battery architecture that paves the way to optimize and improve the operation of the batteries for different flight conditions. The sizing/configuration of the battery packs has an impact on the dc bus voltage\, drive train topology and system weight. In this presentation\, an optimization method is discussed to select the dc bus configuration that improves the efficiency and payload capacity of the eVTOL.The safe operation of an eVTOL energy system is dependent on the battery management system used. In this presentation\, the importance of battery impedance and a novel method to extract battery temperature using online impedance measurement is discussed. A low-complexity method is introduced to develop the battery equivalent circuit model online\, that can be used as a digital twin within the battery management system for system diagnostics and protection.Biography of the speaker:Abhijit Kulkarni received the Ph.D. degree in electrical engineering from the Department of Electrical Engineering\, Indian Institute of Science\, Bengaluru\, India\, in 2016. From July 2016 to July 2017\, he was a Post-Doctoral Research Associate with the University of Illinois at Chicago\, Chicago\, IL\, USA. Subsequently\, he worked as a Scientist with Honeywell Technology Solutions Lab. Pvt. Ltd.\, Bengaluru. He is currently an Assistant Professor at Aalborg University\, Denmark.All are welcome.
URL:https://ee.iisc.ac.in/event/title-power-architecture-and-battery-management-systems-research-in-evtols-electric-vertical-take-off-and-landing/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20231229T080000
DTEND;TZID=Asia/Kolkata:20240116T170000
DTSTAMP:20260404T041700
CREATED:20231229T084231Z
LAST-MODIFIED:20231229T084509Z
UID:241290-1703836800-1705424400@ee.iisc.ac.in
SUMMARY:Courses offered by EE faculty during Jan-April Semester 2024
DESCRIPTION:Courses offered by EE faculty during Jan-April Semester 2024 \nEE Courses_JanTerm2024
URL:https://ee.iisc.ac.in/event/courses-offered-by-ee-faculty-during-jan-april-semester-2024/
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20231222T100000
DTEND;TZID=Asia/Kolkata:20231222T113000
DTSTAMP:20260404T041700
CREATED:20231212T083929Z
LAST-MODIFIED:20231212T083929Z
UID:241198-1703239200-1703244600@ee.iisc.ac.in
SUMMARY: Ph.D. Thesis Defence: Resource-Aware State-Triggered Networked Control Systems
DESCRIPTION: Ph.D. Thesis Defence.Speaker: Anusree RajanSupervisor: Pavankumar TallapragadaDate and Time: Friday\, 22 December 2023\, at 10 amVenue (Hybrid): MMCR (C241)\, EE DepartmentMS Teams LinkTitle: Resource-Aware State-Triggered Networked Control SystemsAbstract:Networked control systems are very popular nowadays\, with different fields of applications such as environmental monitoring\, industrial automation\, military surveillance\, and disaster management. State-triggered control is a commonly used control method in the field of networked control systems owing to its advantage of efficient utilization of resources while simultaneously achieving control objectives. In this control method\, the communication times are opportunistic and implicitly determined by a triggering rule. In addition\, state-triggered control can be designed with provable guarantees for a variety of systems\, including nonlinear systems\, distributed systems\, and multi-agent systems\, and for a variety of control objectives\, such as stabilization\, filtering\, trajectory tracking\, distributed optimization\, multi-agent consensus\, and model predictive control.However\, the question of how to theoretically analyze the resource usage by a state-triggered control system is not well understood even in the simplest settings. Understanding inter-event times generated by a triggering rule is necessary for higher level planning and scheduling for control over shared or constrained resources as well as for the analytical quantification of the usage of communication or other resources compared to a time-triggered controller. This motivates the first part of the thesis\, in which\, we provide a systematic way to analyze the evolution of inter-event times in planar linear systems\, under a general class of scale-invariant event triggering rules. We provide a sufficient condition for the convergence or non-convergence of inter-event times to a steady state value. We also provide a sufficient condition for the asymptotic average inter-event time to be a constant for all non-zero initial states of the system. Then\, under a special case\, we comment on the asymptotic behaviour of the inter-event times\, including on whether the inter-event times converge to a periodic sequence. Later\, we extend our analysis of inter-event times to linear systems under region-based self-triggered control. In this control method\, the state space is partitioned into a finite number of conic regions and each region is associated with a fixed inter-event time. We provide several necessary conditions and sufficient conditions for the local convergence of inter-event times to a constant or to a given periodic sequence.In the second part of this thesis\, we consider a design problem. Most of the existing event- or self-triggered controllers are designed using sampled-data zero-order-hold (ZOH) control input. However\, many communication protocols used in networked control systems\, such as TCP and UDP\, have a minimum packet size. So\, ZOH control may lead to under-utilization of each packet while also increasing the number of communication instances. On the other hand\, use of non-ZOH control leads to better utilization of the minimum payload of each packet while also reducing the overall number of communication instances. With these motivations\, we propose a new control method called event-triggered parametrized control (ETPC). In this control method\, between two consecutive events\, each control input to the plant is a linear combination of a set of linearly independent scalar functions. At each event\, the coefficients of the parameterized control input are chosen to minimize the error in approximating a continuous time control signal and then they are communicated to the actuator. We\, first\, showcase this method by focusing on the specific problem of stabilization of linear systems. We design two event-triggering rules that guarantee global asymptotic stability of the origin of the closed loop system under some conditions on the model uncertainty. Later\, we use a similar idea to propose an event-triggered polynomial control method for trajectory tracking of unicycle robots. We design an event-triggered parametrized controller for trajectory tracking by a unicycle robot and provide guarantees for uniform ultimate boundedness of the tracking error.Due to time limitations\, the defence will focus on the second part of the thesis.——————————- All are Welcome —————————-
URL:https://ee.iisc.ac.in/event/ph-d-thesis-defence-resource-aware-state-triggered-networked-control-systems/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20231221T110000
DTEND;TZID=Asia/Kolkata:20231221T130000
DTSTAMP:20260404T041700
CREATED:20231218T044331Z
LAST-MODIFIED:20231218T044331Z
UID:241280-1703156400-1703163600@ee.iisc.ac.in
SUMMARY:[EE/CPS Seminar] Apurv Shukla - Differentially Private Online Resource Allocation
DESCRIPTION:EE/CPS SeminarSpeaker: Apurv ShuklaPostdoctoral Associate at Texas A&M UniversityTitle: Differentially Private Online Resource AllocationDate: Thursday\, 21 December 2023Time: 11amVenue: EE MMCR (C241)Abstract:We consider an online resource allocation problem when thedecision-maker wishes to preserve the privacy of incoming arrivals andrewards. We present a family of algorithms based on private meanestimation and primal-dual schemes that achieve optimal utilityguarantees. We establish utility and privacy bounds on the behavior ofalgorithms in this family under minimal assumptions on the arrivalprocess. These results are further corroborated by a set of numericalexperiments that demonstrate the tightness of our bounds.Biography of the speaker:Apurv is a Postdoctoral Associate at Texas A&M working with Prof. Le Xieand Prof. PR Kumar. His research interest lies in learning and controlwith applications in power systems. He obtained his PhD from ColumbiaUniversity and his bachelor’s degree from IIT Kharagpur.
URL:https://ee.iisc.ac.in/event/ee-cps-seminar-apurv-shukla-differentially-private-online-resource-allocation/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20231211T110000
DTEND;TZID=Asia/Kolkata:20231211T130000
DTSTAMP:20260404T041700
CREATED:20231211T040647Z
LAST-MODIFIED:20231211T040647Z
UID:241170-1702292400-1702299600@ee.iisc.ac.in
SUMMARY:[Talk] TCE Lecture Series on Power Systems
DESCRIPTION:Title:  Control and Management of Electric Grid with Inverter-Based Resources (IBRs)  \nSpeaker: \nProf Sukumar Kamalasadan \nProfessor and Distinguished Scholar \nDepartment of Electrical & Computer Engineering \nThe University of North Carolina at Charlotte \n Abstract: \nIn this talk\, the management and control of the electric grid with renewables is discussed. Functions that include renewable energy resources\, energy storage\, advanced management systems\, and the operational framework is illustrated. Further\, operational methods including newer management and control tools are presented with a special emphasis on supply-side management functions. Finally\, evolving methods and pathways of electric grid management that integrate data sets generated from sensors and meters are discussed with a special emphasis on the overall reliability and resiliency of the electric grid with renewable energy resources. \n \n \nShort Biography: \nSukumar Kamalasadan is a Professor and Distinguished Scholar of electric power engineering at the University of North Carolina at Charlotte (UNCC) and the Director of power energy and intelligent systems lab (PEISL) within the Energy Production and Infrastructure Center (EPIC) at UNCC. He received his Ph.D. degree in electrical engineering from the University of Toledo\, OH in 2004. His research interests include inverter-based resources modeling and integration\, data-driven approaches to power grid modernization\, smart grid\, microgrid\, power system operation and optimization\, and power system dynamics\, stability\, and control. Prof. Kamalasadan’s research for the last 20 years has resulted in tools and methods that have a high-level impact on electric utility modernization with a fleet-wide deployment of his tools that enabled modern grid management and control towards 100% integration of renewable energy. His research work has secured more than $12M in grants and contracts notably from the US Department of Energy\, National Science Foundation (NSF)\, Siemens Energy\, Duke Energy Corporation\, Schweitzer Engineering Lab\, and several other industries. He is the chief architect of Duke Energy Smart Grid Laboratory at UNCC\, a $5M facility. Prof. Kamalasadan has co-authored more than 250 refereed journal and conference articles and has received several awards from IEEE and NSF including the National Science Foundation CAREER award. He has delivered more than 100 talks in the form of tutorials\, keynotes\, panels\, and webinars/workshops at various international IEEE conferences.
URL:https://ee.iisc.ac.in/event/talk-tce-lecture-series-on-power-systems/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20231201T150000
DTEND;TZID=Asia/Kolkata:20231201T170000
DTSTAMP:20260404T041700
CREATED:20231128T085732Z
LAST-MODIFIED:20231128T085732Z
UID:241165-1701442800-1701450000@ee.iisc.ac.in
SUMMARY:[EE Ph. D. Colloq.] - Dual Mode Operation of Grid-tied Inverters: Modeling\, Islanding Detection\, and Transfer of Control
DESCRIPTION:Ph. D. Thesis ColloquiumStudent: Sugoto MaulikAdvisor: Prof. Vinod JohnDegree: PhDDate and Time: 03:00 PM\, 1st December 2023Place: MMCR EE\, IISc.=========================================Title: Dual Mode Operation of Grid-tied Inverters: Modeling\, Islanding Detection\, and Transfer of ControlAbstract: Increased penetration of renewable energy sources like solar PVs and wind is fundamentally altering the power flow dynamics in distribution networks. These localized forms of generation add redundancy to the power system and increase its load-handling capacity. However\, these advantages come at the cost of reduced stability and altered protection requirements. These distributed forms of generation (DGs) are interfaced with the power grid via power electronic converters operating at high bandwidths compared to conventional sources. While these offer higher performance\, but consequently lower the stability margins. An analytical framework is thus necessary for modeling and stability analysis of such systems. The dynamics involved in modeling a grid-tied DG system span a wide spectrum of frequencies. While simplified modeling can lead to inaccuracies\, an all-inclusive model leads to complex and unintuitive models. This work proposes a systematic approach to model the behavior of 3-phase AC grid-tied DG systems using dynamic phasors. Dynamic phasors allow for a state-space representation of the relevant dynamics.The developed state space model is used for the following:1.      Islanding detectionIslands are formed in 3-phase distribution networks when an active DG is disconnected from the grid. If undetected\, the DG continues to energize its local loads\, leading to safety concerns. In this work\, a state-feedback approach is developed for islanding detection\, which places a system pole in the right half plane (RHP). This ensures the destabilization of the islanded network and a zero non-detection zone. Methods for tuning of the control parameters to meet the system islanding detection requirements are proposed. The scheme is designed and implemented experimentally.2.      Transfer of ControlPost-island detection\, the DG is required to disconnect from the grid while ensuring uninterrupted power flow to its local loads. A control scheme involving a voltage control loop and grid current feed-forward is developed to achieve a fast transfer from grid-following to grid-forming mode of operation. The introduced voltage control loop ensures that rated voltage is maintained across the loads\, and the grid current feed-forward is used to minimize the transients during the transfer process. The method is designed and implemented in conjunction with the islanding detection scheme and verified experimentally with local loads.3.      Stability analysis of grid-tied DG systemsOwing to the formation of microgrids and weak grids in the distribution network\, the stability assessment of such networks becomes essential. This assessment is performed by extending the dynamic phasor-based model for islanded systems to model grid-tied systems as well. The developed model includes the dynamics of the PLL\, grid\, DG current levels\, and load. In addition to passive loads\, considered in the relevant literature\, the proposed model also incorporates the effect of constant power and constant current type power electronic loads. It is demonstrated\, analytically and experimentally\, that the presence of local loads has a stabilizing impact on the synchronization stability of a DG. Additionally\, an upper limit on the bandwidth of power-electronic type constant power loads is derived\, affirming the observation that high bandwidth loads lead to reduced system stability.All the proposed methods are validated on hardware prototypes that have been developed as a part of the work. ——————           ALL ARE WELCOME            —————
URL:https://ee.iisc.ac.in/event/ee-ph-d-colloq-dual-mode-operation-of-grid-tied-inverters-modeling-islanding-detection-and-transfer-of-control/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20231129T160000
DTEND;TZID=Asia/Kolkata:20231129T173000
DTSTAMP:20260404T041700
CREATED:20231129T050107Z
LAST-MODIFIED:20231129T050107Z
UID:241167-1701273600-1701279000@ee.iisc.ac.in
SUMMARY:Talk: India Semiconductor Mission by Prof Tummala Rao
DESCRIPTION:Title: Next Gen\, Global- level and Large-scale Device\, Packaging and Systems R&D and Workforce development in India. \nSpeaker: Professor Tummala Rao is a distinguished IISc alumnus and an ISM\, India advisor. Former IBM Fellow and Founding Director of Georgia Tech 3D Systems Packaging Research Center. \nDate and Time: Wednesday\, November 29\, 2023. 4:00 PM \nVenue: MMCR Department of Electrical Engineering IISc \nTeams Link \nAbstract: India has not been a global player in semiconductors and packaging. But it can be with the new ISM initiative in manufacturing and R&D. Prof. Rao Tummala believes that India can transform its electronics by transforming its academics into industry-centric R&D culture\, based on the Georgia Tech model\, by performing massive global level R&D that India is capable of. But this R&D must be consistent with global industry needs in integrated systems packaging by highly- innovative\, young\, and energetic faculty and great executive Directors that India already has at its IITs and IISc. The proposal describes the strategic\, next- gen global level R&D\, education and skill development programs\, infrastructure needed for these and the resulting IP creation and exponential growth in startups to attract many global companies to make India globally competitive. Indian Government is committed to invest in next gen R&D at its academic institutions with the state-of-the-art facilities\, as well as state of the art facilities for technology development at ISRC thereby attracting companies both for R&D and manufacturing in both semiconductors and packages. With these investments\, India\, for the first time\, has all the programs necessary for it to be a global player in the short term and global leader in the long term in integrated systems. If such an investment by the GOI is matched by the industry in a consortium mode\, India can transform itself from its current design-centric to system centric with expertise and resources spanning from system design and architectures to system integration\, assembly and test to offer system foundry for the world. \nA proposal was developed by more than 50 academic faculty from India’s top 13 academic institution and 20  colleges and universities under the advice and leadership of Prof. Rao Tummala\, as a champion for vision\, strategy\, and programs\, based on a highly successful Georgia Tech model for leading-edge R&D from concept to commercialization\, education of large number cross-disciplinary students\, and industry partnership with about 100 global companies—all simultaneously. The Indian proposal is expected to result in 12 India-wide Centers of Excellence in 12 different strategic technologies funded by GOI and potentially another 12 COEs funded by the private industry. The proposal also involves partnership with more than 50 global semiconductor and packaging companies from around the globe and 24 global academic experts from Purdue\, Georgia Tech\, Penn State\, USC\, University of Arkansas\, Maryland\, Florida International and Illinois in the proposed 12 strategic research areas (SRAs). \nThe proposed R&D and workforce development programs are the best examples of how government\, universities and global companies can work together for mutual benefit. For the academic community\, the Indian universities will begin to perform global R&D and educate the needed workforce for the emerging semiconductor\, packaging\, and systems industry – the two most important strategic needs for the global industry. In so doing\, it will develop global academic faculty leaders and provide jobs for their students in India. For global academic collaborators from US\, Indian R&D provides additional opportunities\, in addition to educated students from India as their Ph. D students for the global industry\, India will develop most comprehensive\, large scale global- level R&D\, unlike most\, if not all countries\, and attract large number of companies to come to India\, just for R&D in a decade. For its investment\, Indian government can claim to have set up the complete ecosystem from research to technology development to manufacturing\, just like in advanced countries\, in semiconductors and packaging to grow its economy to capture a significant portion of $2T market\, to become 3rd largest economy by 2030. \n This program requires large number of faculty and students from electrical\, mechanical\, materials and chemical engineering disciplines \nBiography: Education: B.E: Indian Institute of Science. Ph.D.: U of Illinois \n\nIndustry: 25 years at IBM \n\n\n\nIBM Fellow and Director of Advanced Packaging Lab\nPioneered Industry 1st Plasma Display\nPioneered industry’s first LTCC for all RF applications.\nDeveloped Industry’s 1st 100-144 integrated chip package\, very much like today’s chip let package.\n\n\n\nAcademia: 28 Years at Georgia Tech as Distinguished & Chair Professor and Founding Director \n\n\n\n Founding Director of first and only   NSF Eng. Research Center in packaging in US pioneering System on Package vision\nCreated a model at Georgia Tech for a very large and successful global industry consortium.\nEducated 10\,000 engineers in more than 20 different packaging courses.\nGraduated 900 Ph. D & MS packaging engineers to supply to almost all electronic companies in US.\n\n\n\nProfessional Awards \n\n\n\nIEEE named him Father of Modern Packaging and created IEEE Rao Tummala Electronic Packaging Award\, a technical field award.\n Wrote > 800 papers\, 7 Textbooks and > 100 US patents.\nMember of National Academy of Eng.in US and India\, Fellow of IEEE\, &IMAPS\nPresident of IEEE CPMT 2000-2004 and President of IMAPS 1998-2000\n Distinguished Alumni of IISc\, U of Illinois and Distinguished faculty of Georgia Tech\n\n\n\nIndia; Now Advisor to Government of India and Championing large scale R&D and industry consortium in India. \n\nAll are welcome.
URL:https://ee.iisc.ac.in/event/talk-india-semiconductor-mission-by-prof-tummala-rao/
LOCATION:MMCR\, Hall C 241\, 1st floor\, EE department
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DTSTART;TZID=Asia/Kolkata:20231129T100000
DTEND;TZID=Asia/Kolkata:20231129T110000
DTSTAMP:20260404T041700
CREATED:20231128T053238Z
LAST-MODIFIED:20231128T053238Z
UID:241163-1701252000-1701255600@ee.iisc.ac.in
SUMMARY:[Talk] Technology trends and innovation in HV transmission industry\,
DESCRIPTION:Talk \nTitle: Technology trends and innovation in HV transmission industry \nSpeaker: Dr. Manoj Pradhan\, Global R & D Manager HVDC\, Hitachi Energy\, Sweden \nDate: WEDNESDAY\, 29 November 2023 \nTime: 10:00-11:00 AM \nVenue: Seminar Hall\, HVE BUILDING \nCoffee will be served \nABSTRACT \nIn this presentation\, Dr. Pradhan\, R&D manager from Hitachi Energy will share technology trends in HV transmission industry and especially role of HVDC technology in enabling energy transition towards integration of renewable resources. He will provide a comprehensive view of how Hitachi Energy is playing a leading role in advancing the world’s energy system to be more sustainable\, flexible and secure. ​As the pioneering technology leader\, we collaborate with customers and partners to enable a sustainable energy future. \nBiography \n  \nManoj Pradhan joined ABB in 2008\, is now global R&D portfolio manager for HVDC at Hitachi Energy (formerly ABB)\, located in Sweden. He is responsible for technology\, product and solution readiness for both offshore and onshore HVDC projects. \nMr. Pradhan has represented Hitachi Energy in several international multiparty joint industrial initiatives (JIP). He is actively involved and leading discussions in several clean energy forum viz.\, European commission working group on offshore renewable\, EU Horizon InterOPERA and OceanGrid initiatives to enable EU’s renewable energy ambition. \nHe is a great promoter of sustainability and digitalization of power infrastructure. He has also led new business development projects in EV charging sector to align players in the ecosystem to make offerings to accelerate EV adoption. He has led cross business and customer engagement initiatives in decarbonization of steel industry. He has been board member of large research consortium on digitalization\, digital cellulose center. \nHe holds MSc. and PhD degrees in Electrical Sciences from Indian Institute of Science Bangalore\, India (2000-2004). He was senior researcher and postdoctoral research fellow at IIT Madras\, ETH Zurich\, Switzerland\, University of Queensland\, Australia. He is author of > 25 article in IEEE journals and international conferences and Inventor of > 25 granted patents and several high impact publications in CIGRE and IEEE. Mr. Pradhan holds management diploma from Wharton business school\, USA and diploma in global innovation management from Chalmers University of Technology\, Sweden. \nALL ARE WELCOME
URL:https://ee.iisc.ac.in/event/talk-technology-trends-and-innovation-in-hv-transmission-industry/
LOCATION:HV seminar Hall
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