Professinal Seminars
P R O F E S S I O N A L S E M I N A R S
1- High-Power-Density High-Frequency Modular Power Converters for Electronic Grid Applications
FEB.19, 2023 (8:00-09:45)
The unrelenting progress of the power electronics field has been a major enabler for massive deployment of renewable energy sources in the electrical power grid over the past several decades, and it may not be long before all human energy needs could be dominantly provided by electricity, delivered through a hierarchical network of dynamically-decoupled, electronically-interconnected, sub-networks: the Intergrid. The replacement of the existing substations with electronic energy routers will facilitate the change to energy transport and distribution, but will require major advances in power system modeling, analysis, and control methodologies, both at the converter and system levels. The tutorial will present several modeling and control technologies that are being investigated in the Center for Power Electronics Systems (CPES) at Virginia Tech, and it will be organized in 3 parts:
Part 1: Future Electronic Power Systems
· Concept of Hierarchical Electronic Grid Þ Intergrid
· Average modeling of Power Electronics Converters
Part 2: Modeling, Analysis and Control of Electronic Power Systems
· Simple DC and Single-Phase AC System Examples
· Simple Three-Phase AC System Examples
Part 3: Electronic Power Systems Integration
· Subsystem Interactions and Stability of Electronic Power Systems
· Global Intergrid for Sustainable Energy Abundance
Dr. Dushan Boroyevich
University Distinguished Professor
Bradley Department of Electrical and Computer Engineering
Center for Power Electronics Systems (CPES)
Virginia Tech, Blacksburg, Virginia, U.S.А.
Dushan Boroyevich received his Dipl. Ing. degree from the University of Belgrade in 1976 and his M.S. degree from the University of Novi Sad in 1982, in what then used to be Yugoslavia. He received his Ph.D. degree in 1986 from Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, USA. From 1986 to 1990, he was an assistant professor and director of the Power and Industrial Electronics Research Program in the Institute for Power and Electronic Engineering at the University of Novi Sad. He then joined the Bradley Department of Electrical and Computer Engineering at Virginia Tech as associate professor. He is now University Distinguished Professor and Associate Vice President for Research and Innovation in Energy Systems at Virginia Tech, and Deputy Director of the Center for Power Electronics Systems.
Dr. Boroyevich has led numerous research projects in the areas of multi-phase power conversion, electronic power distribution systems, modeling and control, and multi-disciplinary design optimization. He has advised over 40 Ph.D. and 40 M.S. students to graduation and has co-authored with them almost 1,000 papers which have been referenced by other authors over 40,000 times. Dushan is an IEEE Life Fellow, a recipient of the IEEE William E. Newell Power Electronics Technical Field Award and of IEEE Power Electronics Society Harry A. Owen Distinguished Service Award, and a past President of the IEEE Power Electronics Society. He is also the recipient of the Outstanding Achievement Award by the European Power Electronics Association and the award for Outstanding Achievements and Service by the European Power Electronics and Motion Control Council. Dr. Boroyevich is an Honorary Professor at Xi'an Jiaotong University and at Tsinghua University, and the Pao Yue-Kong Chair Professor at Zhejiang University in P.R. China, and the Kwoh-Ting Li Chair Professor at the National Cheng-Kung University in Taiwan. He received many prize paper awards, several awards for excellence in research and teaching at Virginia Tech and he is a member of the Virginia Tech College of Engineering Academy of Engineering Excellence. Dushan was elected to the U.S. National Academy of Engineering in 2014 for advancements in the control, modeling, and design of electronic power conversion for electric energy and transportation.
2- Design for Reliability in Power Electronic Systems
FEB.19, 2023 (10:15-11:30)
In recent years, the automotive and aerospace industries have brought stringent reliability constraints on power electronic converters because of safety requirements. Today customers of many power electronic products expect up to 20 years of lifetime and they also want to have a “failure free period” and all with focus on the financials. The renewable energy sectors are also following the same trend, and more and more efforts are being devoted to improving power electronic converters to account for reliability with cost-effective and sustainable solutions. This presentation will introduce the recent progress in the reliability aspect study of power electronic converters for power electronic applications with special focus on renewables. It will cover the following contents: the motivations for highly reliable electric energy conversion in renewable energy systems; the reliability requirements of typical renewable energy systems and its implication on the power electronic converters; failure mechanisms and lifetime models of key power electronic components (e.g., power semiconductor switches, capacitors, and fans); long-term mission profiles in Photovoltaic (PV) and wind power applications and the component level stress analysis; reliability analysis methods, tools, and improvement strategies of power electronic converters for renewable energy systems. A few case studies on PV and wind power based renewable energy systems will also be discussed.
Prof. Frede Blaabjerg
Aalborg Universitet, Denmark.
Frede Blaabjerg (S’86–M’88–SM’97–F’03) was with ABB-Scandia, Randers, Denmark, from 1987 to 1988. From 1988 to 1992, he got the PhD degree in Electrical Engineering at Aalborg University in 1995. He became an Assistant Professor in 1992, an Associate Professor in 1996, and a Full Professor of power electronics and drives in 1998 at AAU Energy. From 2017 he became a Villum Investigator. He is honoris causa at University Politehnica Timisoara (UPT), Romania in 2017 and Tallinn Technical University (TTU), Estonia in 2018.
His current research interests include power electronics and its applications such as in wind turbines, PV systems, reliability, Power-2-X, power quality and adjustable speed drives. He has published more than 600 journal papers in the fields of power electronics and its applications. He is the co-author of eight monographs and editor of fourteen books in power electronics and its applications.
He has received 38 IEEE Prize Paper Awards, the IEEE PELS Distinguished Service Award in 2009, the EPE-PEMC Council Award in 2010, the IEEE William E. Newell Power Electronics Award 2014, the Villum Kann Rasmussen Research Award 2014, the Global Energy Prize in 2019 and the 2020 IEEE Edison Medal. He was the Editor-in-Chief of the IEEE TRANSACTIONS ON POWER ELECTRONICS from 2006 to 2012. He has been Distinguished Lecturer for the IEEE Power Electronics Society from 2005 to 2007 and for the IEEE Industry Applications Society from 2010 to 2011 as well as 2017 to 2018. In 2019-2020 he served as a President of IEEE Power Electronics Society. He has been Vice-President of the Danish Academy of Technical Sciences.
He is nominated in 2014-2021 by Thomson Reuters to be between the most 250 cited researchers in Engineering in the world.
3- Advances in integrated point-of-load power converters
FEB.19, 2023 (15:15-16:15)
Miniaturized power supplies are essential for the development of electronics systems. As more functions are packed in a limited space in such systems, power supplies are required to be more compact and efficient.
In a power supply in package (PSIP) structure, discrete inductors and capacitors are co-packaged with the power management integrated circuits on either a lead-frame or laminate substrate.
On the other hand, power supply on chip (PwrSoC) integration technologies is an ideal approach toward compact, efficient, and low-cost converters. However, various technological obstacles need to be resolved to achieve the aforementioned goals.
The PSIP methods of integration have relatively fast prototyping and production cycles as well as simple packaging steps. On the other hand, designing miniaturized PSIP units is extremely challenging. The main limitation of further miniaturization comes from thermal performance. Assembling components next to each other in a very close proximity leads to severe thermal penalty and can result in device failures
In this talk, advances integrated power electronics components and integration methods will be presented. Moreover, Lotus Microsystems’ Power Interposer Technology (PIT) is introduced. The PIT technology allows for PSIP integration on silicon-based interposers which offer superior thermal performance compared to existing technologies
Yasser Nour
(IEEE Senior Member) is CTO and Co-Founder of Lotus Microsystems. Yasser received the B.Sc. and M.Sc. degrees in electrical engineering from South Valley University, Aswan, Egypt, in 2007 and 2011, respectively. He received the PhD degree in electrical engineering from the Technical University of Denmark, Kongens Lyngby, Denmark, in 2018.
Miniaturized power supplies are essential for the development of electronics systems. As more functions are packed in a limited space in such systems, power supplies are required to be more compact and efficient.
In a power supply in package (PSIP) structure, discrete inductors and capacitors are co-packaged with the power management integrated circuits on either a lead-frame or laminate substrate.
On the other hand, power supply on chip (PwrSoC) integration technologies is an ideal approach toward compact, efficient, and low-cost converters. However, various technological obstacles need to be resolved to achieve the aforementioned goals.
The PSIP methods of integration have relatively fast prototyping and production cycles as well as simple packaging steps. On the other hand, designing miniaturized PSIP units is extremely challenging. The main limitation of further miniaturization comes from thermal performance. Assembling components next to each other in a very close proximity leads to severe thermal penalty and can result in device failures
In this talk, advances integrated power electronics components and integration methods will be presented. Moreover, Lotus Microsystems’ Power Interposer Technology (PIT) is introduced. The PIT technology allows for PSIP integration on silicon-based interposers which offer superior thermal performance compared to existing technologies
4- Challenges in Transportation Electrification- Modeling, Electric Drives, Power Electronics Architectures & Packaging FEB.20, 2023 (10:15-11:30)
Electrification of the transportation industry and large-scale integration of renewable energy sources into the power grid represent some of the most disruptive transformations of our time. This field brings ideas from Computational electromagnetics, power and energy, electromechanics, IoT, and artificial intelligence. We are meeting new challenges in creating efficient, reliable, safe, and environmentally friendly means of implementing these ideas for the electrified transportation infrastructure.
In this talk, we will share our views on the future of these applications through a detailed discussion of the roles of computational modeling, Power electronics architectures, devices, the embedding of components, challenges of utilizing magnetics, and thermal management under higher operational frequencies, currents, and voltages. We will discuss packaging issues and describe some applications requiring increased power densities. The presentation will also identify the research areas with high impact and potential for achieving improved performance.
Dr. Osama A.Mohammed
Dr. Osama A.Mohammed is a Distinguished Professor of Electrical Engineering and the Associate Dean of Research at the College of Engineering and Computing at Florida International University. He has researched various topics in computational methods, power and energy systems, design optimization, and physics-based modeling in electric drive systems, power electronics, and other low-frequency environments. Dr. Mohammed is world-renowned for his contributions in these areas. He has significant research in electromagnetic signatures, EMI, wide bandgap devices, and movable power systems modeling and analysis. Professor Mohammed has active research projects for several federal agencies in these areas. In addition, he has also completed projects in power system operation, smart grid distributed control and interoperability, cyber-physical.
5- Power Electronics, Startup Companies and Venture Capital; a View for Capitalizing on New Technologies FEB.20, 2023 (15:15-16:15)
This talk provides a broad view on how new technology innovations in power electronics can become successful commercial enterprises. It also describes how venture capital can serve as one of the primary catalysts to realize that success.
Dr. Ashraf Lotfi
Deep Science Ventures
For the past 35 years, Ashraf has been leading power semiconductor research, technology, product development as well as business management, acquisitions, intellectual property, and global marketing and sales.
He is Venture Partner at Deep Science Ventures, a firm specializing in creating new companies based on fundamental science and technology. Prior to that he founded power semiconductor company Enpirion in 2002 as its President & CEO. He built it from the ground up to profitable revenues by delivering innovative power conversion technology products. He led its acquisition by Altera in 2013 and into Intel in 2015. He was Vice President for global business development until 2020 in its Programmable Solutions business group.
Formerly, he was Director of Power Management Research at Bell Laboratories, Murray Hill NJ. His research leadership work in power systems ranged from high speed, high-voltage transistors in Si, SiC, GaAs, thin-film magnetic semiconductors and high-density power conversion for systems-on-chip. He served on the advisory boards of Potentia Semiconductor (acq. POWI 2008) and Enterprise Ireland – Power electronics initiative.
He received the BS degree Cairo Univ. 1984, PhD Virginia Tech 1993 and Exec. MBA Northeastern Univ. 2001. He is inventor on 170 US patents and received the 2013 New Jersey Technology Council’s CEO-of-the-year award. He is a Fellow of the IEEE.
