While the PELS continues to maintain a listing of technical experts in the power electronics field who are available for Chapters and conferences, it also invites authors of outstanding technical papers to present webinars. The objective of PELS webinars is to educate PELS members about the area of power electronics.
Professional Development: PELS is pleased to honor one hour of Professional Development training for attending a webinar. Upon completion of the session, please submit a request for a certificate. The certificate will be emailed to the address provided within ten business days. Please email any questions to the IEEE Continuing Education Department.
Abstract: The presentation will focus on the electrical system, including the drivetrain and interfaces to energy storage/generation elements, needed for the electrification of future aircraft propulsion systems. This will include the roadmaps and technologies that need to be developed over the coming decades as well as examples from existing Research and Development projects. Both hybrid and fully electric propulsion systems will be considered as well as the power electronic converters, motors/generators, gearboxes, electrical systems, and thermal management.
Biography: Prof. Pat Wheeler received his Ph.D. degree in Electrical Engineering for his work on Matrix Converters at the University of Bristol, England in 1993. In 1993 he moved to the University of Nottingham and worked as a research assistant in the School of Electrical and Electronic Engineering.
In 1996 he became a lecturer in Power Electronic Systems with the Power Electronics, Machines and Control Group at the University of Nottingham, UK, becoming a Senior Lecturer in 2003, and a Professor in January 2008. He is a member of the Power Electronics, Machines and Control research group.
Abstract: Growing trend of digitization and ever-decreasing cost of digital VLSI are the driving force for the increasing adoption of digital control in power management commercial products for emerging applications, such as automotive, data center and computing, telecom, aerospace, EV chargers, renewable, etc. Digital control offers fast transient, high efficiency and reliability, reduced conducted EMI, lower component count, fault tolerant and faster time-to-market. However, the challenges remain in identifying cost-effective digital control solutions, modelling, analysis and design methods.
This presentation covers opportunities and challenges using digital control, and highlights some commercial digital control ICs and system solutions. Well-known fixed/variable frequency analog control techniques are summarized, and possible levels of digitization are presented for individual control methods by considering cost, flexibility, modularity, etc. Thereafter, fixed and variable frequency digital control architectures are presented. Different modelling and analysis techniques are summarized. Small- and large-signal based design methods are explored by considering simplicity and accuracy aspects. Some popular digital PWM and ripple based digital control techniques are presented, and their benefits and shortcomings are presented. Thereafter, the need for cost-effective IP and skilled manpower development is identified. Finally, the overview of a newly developed online course is presented, which is entitled "Digital Control of Switched Mode Power Converter and FPGA-based Prototyping". This will provide pedagogical resources for Power Electronics researchers and engineers, which will be freely accessible on YouTube in November 2022.
From 2009 to 2010, he was a Visiting Scholar with the Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, USA. From 2010 to 2011, he was a Research Engineer with GE Global Research, Bengaluru, India. From 2011 to 2019, he was with the Electrical Engineering Department (EED), IIT Kharagpur. From July to November 2019, he was with the EED, IIT Delhi, New Delhi, India. He returned back to IIT Kharagpur in December 2019, where he is currently an Associate Professor with EED. He developed the Embedded Power Management Laboratory, IIT Kharagpur in 2014. He has initiated high-performance digital power management research in India. He has offered multiple online certification courses and industry training programs related to modeling and control in switched-mode power converters. His research interests include high-frequency power converters, high-performance mixed-signal control, nonlinear dynamics; and applications to portable, server power supply, data center, LED drivers DC grid, and battery chargers.
Dr. Kapat was a recipient of the Qualcomm Faculty Award (2022), Faculty Excellent Award (Associate Professor) at IIT Kharagpur in 2022, INSA Young Scientist Medal and the INAE Young Engineering Award in 2016, and the DAE Young Scientist Research Award in 2014. He has been serving as an Associate Editor for the IEEE Transactions on Power Electronics since 2015, IEEE Transactions on Circuits and Systems—II since 2018, and IEEE Journal of Emerging and Selected Topics in Power Electronics since 2020.
Abstract: The electrification of the transport sector is one of the main key elements to decarbonize the energy system while the charging infrastructures of electric vehicles must be supplied by sustainable, decentralized energy resources. In addition, battery energy storage systems are required to secure the power supply by volatile resources. Since e.g. photovoltaics and battery energy storage systems are operated with direct current internally, DC microgrids for the connection of energy sources, energy storage and loads have several advantages over established approaches with AC connection. The presentation will focus on the advantages and design aspects of DC microgrids for charging infrastructure.
Biography: Marco Stieneker studied Electrical Power Engineering at RWTH Aachen University, Aachen, Germany, and at NTNU in Trondheim, Norway. He received the Diploma degree (Dipl.-Ing.) in 2010 and the doctoral degree (Dr.-Ing.) in 2017 from RWTH Aachen University. At the E.ON Energy Research Center (E.ON) of RWTH Aachen University, he worked as Research Associate and headed the research group on high-power electronics of Prof. Rik De Doncker as Chief Engineer until he joined industry in 2018. After working on MVDC grids and hybrid power plants for industry plants as well as on the product development of conventional high-power DC chargers, he joined the Maschinenfabrik Reinhausen GmbH in 2021 as project manager for DC power applications. His focus is on power-electronic converters and high-power DC chargers for DC microgrids.
This webinar is sponsored by the IEEE Power Electronics Society Technical Committee on Aerospace Power.
Abstract: High-voltage and high-power multilevel inverters (MLIs) have gained attention as the transportation electrification trend is rapidly expanding towards high-capacity mass transit systems. Conventional MLIs such as neutral point clamped (NPC) and T-type inverters provide high-voltage and high-power operation capabilities but require stacked dc-link capacitors with neutral point connection for zero voltage vectors. This neutral point connection generates a neutral current oscillating at three times the fundamental frequency, causing capacitor voltage imbalance and overvoltage stress on capacitors and switching devices. Neutral-point-less (NPL) MLI topologies with a small and single dc-link capacitor, the H- and X-type inverters, and their operating principles are proposed. The performance of the NPL inverter is investigated through simulation and compared to the T-type and NPC inverters. Simulation and experimental results show that the NPL inverter has >50% reduced dc-link capacitor current and voltage ripple, as well as less current waveform distortion, leading to smoother power output and a higher volumetric power density.
Biography: Woongkul Lee (S’13-M’19) received the M. S. and Ph. D. degrees from the University of Wisconsin-Madison, WI, USA, in 2016 and 2019 respectively both in electrical engineering. He received his B. S. degree from Yonsei University, Seoul, South Korea, in 2013. He was a postdoctoral research associate with the Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC), the University of Wisconsin-Madison from 2019 to 2020. In 2020, he joined the Department of Electrical and Computer Engineering at Michigan State University as an assistant professor. His research interests include wide bandgap device-based power electronics, high-performance motor drives, and multilevel/multiphase motor drives.
Abstract: Thermal fluctuation posed by periodical power loss is a dominant failure mode of power semiconductor modules. It can lead to accumulated fatigue of bond wires and die-attach. Power cycling is a common reliability test for automotive qualified high-power modules. The conventional power cycling method is time-consuming. To minimize the test time, high junction temperature swing is desired, yet it can be hardly implemented due to the limited load current. In this presentation, the major challenges and pros/cons of the state-of-the-art methods such as conventional DC power cycling and DC power cycling with switching losses are analyzed. An advanced power cycling acceleration method is introduced and validated with experimental results. A novel on-line measurement method of pure solder layer thermal resistance for aging process monitoring is proposed. Additionally, this presentation will discuss several emerging thermal fluctuation suppression methodologies applied in the industry to enhance the reliability of the power modules.
Biography: Shuang Zhao received the B.S. and M.S. degrees in electrical engineering from Wuhan University, Wuhan, China, in 2012 and 2015, respectively. He received his Ph.D. degree in electrical engineering from University of Arkansas, Fayetteville, AR, USA in 2019. In 2018, he was an intern at ABB US Corporate Research Center, Raleigh, NC, USA. In 2019, he joined Infineon Technologies, El Segundo, USA where he was a Sr. Application Engineer for ATV. Since October 2021, he has been with Hefei University of Technology, Hefei, Anhui, China, where he is currently an associate professor in the Department of Electrical Engineering. His research interests include wide bandgap device applications, gate driving, automotive applications, and distributed generation.
Dr. Zhao has published more than 20 peer-reviewed papers and holds a US patent and several pending China patents. He serves as a reviewer for multiple journals, a session chair for several IEEE conferences, and a guest editor for several journals. He was a recipient of the Outstanding Presentation Award of APEC 2018.
Biography: Erping Deng was born in Hunan province, China, in 1989. He received a bachelor degree in electrical engineering from Harbin Institute of Technology, China, in 2013 and the Ph.D degree in electrical engineering from North China Electric Power University, China, in 2018
Dr. Deng works as a full-professor at Hefei University of Technology, Hefei, Anhui province, since 2022. He was a University Lecturer at North China Electric Power University, China from 2018 to 2022 and a PostDoc at Chemnitz University of Technology, Germany from 2018 to 2020. His research interests include packaging and reliability of high voltage and high-power press pack IGBTs, power cycling reliability, failure mechanism, lifetime modelling and prediction of power devices.
Looking for a past webinar? All past webinars can be accessed and watched on-demand at the PELS Resource Center - it's also free for PELS members!