Topic: Research on the Transition and Development Strategy of China's Energy and Power System - Scenario Analysis of " Establishing before Abolishing "

Xiaoxin Zhou, IEEE Fellow, Academician of the Chinese Academy of Sciences, International Member of US National Academy of Engineering (NAE), is currently Honorary President of China Electric Power Research Institute, Council Member of China Electrical Engineering Society, Standing Council Member of China Electrotechnical Society. He has been engaged in research on mathematical models and calculation methods for modern power system analysis for a long time. He hosted the development of China's first set of "power system analysis integrated program"(PSASP) software. He conducted the study on flexible AC transmission system (FACTS) which was implemented in the controllable series compensation project of ultra-high voltage transmission for the first time, and developed Advanced Digital Power System Simulator (ADPSS). In the research of energy and power development strategy, he proposed the concept, development mode and key technologies of the third-generation power grid. He was awarded the National Science and Technology Progress Award for three times, IEEE PES Nari Hingorani FACTS Award, and Science & Technology Progress Award of the Ho Leung Ho Lee Foundation.

Based on the strategic goals of China's energy transition, this report conducts research on the transition and development strategy of China's energy and power system in 2020-2060, and proposes the primary energy consumption structure of the new energy system considering the scenario of ‘establishing before abolishing’. The revolution trend of key indicators such as energy structure, power structure, power generation, and total carbon dioxide emissions are emphatically analyzed. Then the performance requirements and new challenges for safe and economical operation of new power system are summarized. The concept and basic framework of integrated energy production unit (IEPU) are proposed, which is supposed to·be·one of the flexibility·and·comprehensive utilization retrofit ways of existing coal-fired power units. Preliminary results show that it can not only provide the power system with broad flexibility regulation and safe and stable operation support capabilities, but also create new economic value for the fossil power industry itself.

Topic: Renewable Energy Based Future Strategies for Powering the Offshore Electrical Systems

Kaushik Rajashekara is presently a Distinguished Professor in the Dept. of Electrical & Computer Engineering, University of Houston. Prior to this, he was a Distinguished Professor in University of Texas at Dallas, Chief Technologist in Rolls-Royce Corporation, and Chief Scientist in Delphi, a division of General Motors. In General Motors, he worked on developing propulsion and power electronics systems for electric, hybrid, and fuel cell vehicle systems. In Rolls-Royce Corporation, his focus was on electric systems for electric and hybrid aircraft systems. He has authored/coauthored over 300 papers in international journals and conferences, has 37 US and 15 foreign patents, and has written one book. He has given over 200 invited presentations in international conferences and universities.  He has received a number of awards including the 2022 Global Energy Prize and 2021 IEEE Medal on Environment & Safety Technologies. He was elected as a Member of the US National Academy of Engineering in 2012, Fellow of the National Academy of Inventors in 2015, a Fellow of Indian National Academy of Engineering in 2013, a Member of the Chinese Academy of Engineering in 2021. His research interests include power/energy conversion, transportation electrification, renewable energy, microgrid systems, and Subsea electrification

The offshore extraction of oil and gas is an energy-intensive process resulting in release of CO2 and methane to the atmosphere. In order to extract the subsea oil and gas, a number of electrical systems are deployed.  Many of these subsea electrical systems need high-reliability power grid and power control units located on the seabed.  To reduce the emissions from the offshore energy production, it is important to supply the subsea electrical loads using renewable energy sources. The offshore industry has become more significant in recent years because a number of offshore wind farms leading to global installed offshore wind capacity to 65 GW as of 2023, and could increase to nearly 400 GW by 2032. One of the applications for offshore wind could be to power the electrical systems that are required for oil and gas extraction, instead of from the gas turbine or diesel engine generators located on the platform. But there are many challenges for deploying the electrical systems and the power converters on the seabed, and for supplying the renewable electrical power either from the offshore wind or from onshore. In this presentation, the requirements and challenges of operating in the subsea environment, current trends, and use of power electronics for efficient transmission of power from the offshore platform or from onshore to the subsea electrical loads.  The presentation also addresses how the renewable sources such as offshore wind can be used for powering not only the subsea electrical loads, but also for other offshore applications such as  production of Hydrogen and for shore power for ships.

Topic: Reflections on the Construction of a New Energy System

Ayman M. El-Refaie received the M.S. and Ph.D. degrees in electrical engineering from the University of Wisconsin Madison on 2002, and 2005 respectively. Between 2005 and 2016 he has been a principal engineer and a project leader at the Electrical Machines and Drives Lab at General Electric Global Research Center. His interests include electrical machines and drives. Since January 2017 he joined Marquette University as the Werner Endowed Chair for Energy Sustainability. He has over 200 journal and conference publications. He has 48 issued US patents.

At GE, he worked on several projects that involve the development of advanced electrical machines for various applications including, aerospace, traction, wind, and water desalination. He was the chair for the IEEE IAS Transportation Systems committee and an associate editor for the Electric Machines committee. He was a technical program chair for the IEEE 2011 Energy Conversion Conference and Exposition (ECCE). He was the general chair for ECCE 2014 and 2015 ECCE steering committee chair. He was the general chair of IEMDC 2019. He was the IEEE IAS Industrial Power Conversion Systems Department. He was the IAS Publications Department Chair He is currently serving as IAS president-elect . He is an IEEE Fellow and a member of Sigma Xi He received several prestigious awards including the IEEE IAS Industrial Power Conversion Systems Department Gerald Kliman Innovator Award and the 2022 ICEM Arthur Ellison Achievement Award. He is the recipient of three paper awards.

Topic: A Time-domain Stability Analysis Method of Power Converters System and Stability Improving Controls

Hong Li (Senior Member, IEEE) received the M.Sc. degree in electrical engineering from South China University of Technology, Guangzhou, China, in 2005, and the Ph.D. degree in electrical engineering from Fernuniversität in Hagen, Germany, in 2009.

Hong Li is the Distinguished Young Scholar of National Science Fund China,  and she has hosted five projects granted by National Natural Science Foundation China. She is currently a Full Professor with the School of Electrical Engineering, Beijing Jiaotong University, Beijing, China. She has published 2 book, 70 journal papers, and 63 conference papers. She has also authorized 50 patents. Her research interests include nonlinear modeling, analysis and its applications, EMI suppressing methods for power electronic systems, wide bandgap power devices and applications. She is an Associate Editor of the IEEE Transactions on Industrial Electronics, an Associate Editor of  IEEE Transactions on Power Electronics, , an Associate Editor of the IEEE Open Journal of Industrial Electronics Society, an Associate Editor of the Chinese Journal of Electrical Engineering, She is the IEEE PELS member-at-large, Vice Chairman of IEEE PELS China and the Vice Chairman of Electromagnetic Compatibility Specialized Committee in China Power Supply Society.

Different from the traditional frequency-domain stability analysis method, this report focuses on the time-domain modeling and stability analysis of power converters system. Considering the complexity of the traditional frequency-domain stability analysis method in multi-converters system, a general time-domain stability analysis method based on Floquet theory is introduced and verified in theory, simulation and experiment. This method can used not only in DC-DC converters system, single-phase and three-phase DC-AC inverters system, but also in the hybrid converters system with DC-DC converter and DC-AC converter. Furthermore, based on this time-domain stability criteria and eigenvalue sensitivity, the stability improving controls are deduced, finally, the universality and practicality of these controls are proved by simulation and experiment both.

Topic: Short Resonance Aided Soft-switching Current-fed DC/DC Converters

Akshay Kumar Rathore is an IEEE Fellow and expert in power electronics and control of electrical motor drives. He is currently a Professor and Program leader of Electrical Power Engineering Degree Program jointly offered with Newcastle University, UK. He received the Gold Medal for securing the highest academic standing in his Master’s degree among all electrical engineering specializations at Indian Institute of Technology (BHU) Varanasi, India. He received his PhD degree in Power Electronics from University of Victoria, British Columbia, Canada in 2008. He had two subsequent postdoctoral research appointments with the University of Wuppertal, Germany, and the University of Illinois at Chicago, USA.  From 2011-2015, he served as an Assistant Professor in Electrical   and   Computer   Engineering, National   University   of Singapore. From 2016-2021, he served as an Associate Professor in Electrical   and   Computer   Engineering, Concordia University, Montreal, Canada where he was listed in the Provost Circle of Distinction in 2021. He served as the Graduate Program Director and Chair of Graduate Awards during 2020-21.

Dr. Rathore is a recipient   of   the   2013   IEEE   IAS   Andrew   W.   Smith Outstanding Young Member Achievement Award, 2014 Isao Takahashi Power Electronics Award, 2017 IEEE IES David Irwin Early Career Award, 2019 IES Publications Service Recognition Award, 2020   IEEE   Bimal   Bose   Award   for   Industrial Electronics Applications in Energy Systems, 2021 Nagamori Award, and 2023 Distinguished Alumna Award (Young Achiever Category -IIT BHU Varanasi). He published about 300 research papers in international journals and conferences, including 105 IEEE TRANSACTIONS. 

Dr. Rathore is currently serving as the co-Editor-in-Chief of IEEE Transactions on Industrial Electronics, IEEE Fellow Evaluation Committee member of IEEE IES Society, member of the IEEE Nikola Tesla Award Committee and a Distinguished Lecturer of the IEEE PELS society. .

High-frequency power conversion has been a subject of high interest to design and realise high-density, lightweight, and cost-effective power electronic converters. However, hard switching of semiconductor devices leads to increased switching power losses limiting their utilisation to their full capacity and compromising on efficiency. Soft-switching techniques have been introduced for many years to elevate the device switching frequency while reducing/eliminating the switching losses to promote the high-frequency power conversion. Soft-switching can be obtained by several methods and that introduced different design constraints and limitations on soft-switching as well as power converter performance. Resonant converters are popular but offer challenges in voltage gain applications. Additionally, resonant converters suffer from low partial load efficiency owing to circulating current at light load conditions. Other crucial challenges are frequency modulation for load voltage regulation and power flow control, and immunity to resonant current variation with reduction in load current. Partial resonance converters allow resonance only during the switching transition (on and off) that is less than 20% of the switching cycle. This improves light load efficiency and reduces the circulating current through the components reducing their kVA ratings.

Topic: Protection principle and fault current limiting techniques for Flexible DC Grid

Bin Li, Professor, IEEE Senior Member, FIET. His main research field is involved in the protection and control of smart grid. Currently he is an investigator of some on-going research projects in this area supported by National Natural Science Foundation of China and the industry. He has been authorized 50 invention patents. He has published 3 monographs and more than 180 papers, of which 75 are indexed by SCI and more than 100 are indexed by EI. Currently, he is the Director of the Tianjin Key Laboratory of Power System Simulation and Control, and the Deputy Director of Key Laboratory of Smart Grid of Ministry of Education of China.

The VSC techniques have outstanding advantages on the flexible control, large-scale renewable power generation integration. For the VSC-based dc grid, the fault current increases to very large level within a few milliseconds. The dc protection, fault isolation and fault current limitation must effectively cooperate with each other to fast cut off the fault line and guarantee the other healthy dc network to be able to ride through the fault. This presentation analyzes fault characteristics of VSC-base dc system. Based on that, the protection principles and novel fault current limiter are discussed.

Topic: Exploring Grid-Forming Capability Requirements for Converter-Based Resources

Xiongfei Wang is currently a Full Professor at the Department of Electrical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden, a Parttime Professor at Aalborg University, Aalborg, Denmark, and a Visiting Professor at Hitachi Energy Research Center, Vasteras, Sweden. His research interests include modeling and control of power electronic converters, stability and power quality of power-electronic-dominated power systems, and high-power converters.          

He is an IEEE Fellow and the Executive Editor (Editor-in-Chief) for the IEEE Transactions on Power Electronics Letters, as well as an Associate Editor for the IEEE Journal of Emerging and Selected Topics in Power Electronics. He received 10 IEEE Prize Paper Awards, the 2016 AAU Talent for Future Research Leaders, the 2018 Richard M. Bass Outstanding Young Power Electronics Engineer Award, the 2019 IEEE PELS Sustainable Energy Systems Technical Achievement Award, and the 2022 Isao Takahashi Power Electronics Award.

The global movement towards achieving a net-zero energy system is accelerating the uptake of renewable energy resources and the shift towards electrifying various energy consumption. Consequently, there is a significant transformation in electrical grids, primarily driven by the massive use of power electronic converters in this energy transition. Unlike synchronous generators, the dynamics of power converters are highly programmable, depending on their control algorithms, and they often interact with one another across varying timescales. This interaction poses challenges to the stability and security of power systems. Recently, grid-forming converters emerge as a promising solution to address stability issues in modern converter-based electrical grids. Across the globe, power system operators have been continuously updating the functional requirements of grid-forming technologies. This talk will provide a critical review of the latest grid-forming capability requirements, delving into the opportunities and challenges associated with system integration of grid-forming converters.

Topic: Advancements and Challenges in Simultaneous Wireless Power and Data Transfer

Yijie Wang was born in Heilongjiang Province, China, in 1982. He received the B.S., M.S. and PH.D. degrees in electrical engineering from Harbin Institute of Technology (HIT), Harbin, China, in 2005, 2007 and 2012, respectively. From 2012 to 2014, he was a lecturer with the Department of Electrical and Electronics Engineering, HIT. From 2014 to 2017, he was an Associate Professor with the Department of Electrical and Electronics Engineering, HIT. Since 2017, he has been a Professor with the Department of Electrical and Electronics Engineering, HIT. Currently, he serves as the Deputy Dean of the School of Electrical Engineering. His interests include Wireless Power Transfer, High Frequency Power Conversion, Very High Frequency Power Conversion, AC-DC converters, DC-DC converters, soft-switching power converters, power factor corrector, Lighting, LED Drivers. Among them, the research on high-frequency power conversion and wireless power transfer is quite profound. So far, He has published more than 80 high-level journal papers. In addition, he has won IEEE Transactions on Power Electronics 2018 Prize Paper Award (First Place), IEEE Transactions on Power Electronics 2017 Prize Paper Award (Second Place) and IEEE Transactions on Industry Applications 2018 Prize Paper Award (Second Place). Prof. Wang is an Associate Editor of the IEEE Transactions on Industrial Electronics, IEEE Journal of Emerging and Selected Topics in Power Electronics, IEEE Access, IET Power Electronics and Journal of Power Electronics. Also he is a Corresponding Guest Editor of Special Section for IEEE Transactions on Industrial Electronics "High & Very High Frequency Power Supplies for Industrial Applications", a Guest Editor in Chief of Special Issue for IEEE Transactions on Industry Applications "Advanced and Emerging Technologies of High-efficiency and Long-distance Wireless Power Transfer Systems", a Guest Associate Editor of Special Issue for IEEE Journal of Emerging and Selected Topics in Power Electronics "Topologies, Modeling Methodologies and Control Techniques for High-Frequency Power Conversion" and a Leading Guest Editor of Special Issue for IET Power Electronics "Advanced Technologies Utilised in Wireless Power Transfer Systems".

Traditional wireless charging technologies, while capable of powering devices wirelessly, often require separate communication devices for data transfer, limiting flexibility and convenience. Therefore, the development of technologies enabling Simultaneous Wireless Power and Data Transfer (SWPDT) has become a significant area of research. SWPDT aims to supply power and transfer data to mobile devices using the same wireless channel, eliminating the constraints of traditional wired connections. This keynote presentation will delve into the principles, key challenges, and applications of SWPDT technology. It will begin by outlining the fundamental principles of SWPDT, including the coupling of power transfer with data transmission and the modulation techniques employed. The presentation will then focus on the technical challenges facing SWPDT, such as improving rate, mitigating interference. Furthermore, the keynote will discuss and explore the vast application prospects of SWPDT.