99.9% Class Efficiency DC-AC Power Conversion and Its Application to Grid Interconnection
Atsuo Kawamura, Yokohama National University
Abstract
With the advent of wide-bandgap semiconductor devices, power conversion with high conversion efficiency has become possible. The DC-AC power conversion (inverter) is more difficult to achieve ultra-high efficiency than the DC-DC conversion because the output is AC and the input-output voltage ratio changes. First, a survey of recent published literature on inverters with efficiencies in the 99.9% class is presented. Next, the speaker presents the latest results of a 99.9%-class HEECS inverter being pursued by the speakers’ group. With higher efficiency comes the need to guarantee the accuracy of the measurements. The speaker proposed a loss measurement method called the VTASLM method, which uses only electrical measuring instruments and measures a conversion efficiency of 99.75% with a measurement accuracy of 0.006%. In addition, the measured results of the loss breakdown are presented, a methodology on how to obtain higher efficiency is presented, and the latest highest efficiency data (SiC and GaN HEECS inverters) will be presented. Finally, as one application, grid-interconnected HEECS inverters are introduced for renewal energy, and it is shown that leading and lagging power factor operations are realized by the proposed control.
Speaker Biography
Atsuo Kawamura (Life Fellow, IEEE) received the B.S.E.E., M.S.E.E., and Ph.D. degrees in electrical engineering from the University of Tokyo, Tokyo, Japan, in 1976, 1978, and 1981, respectively. After the five-year stay at the University of Missouri-Columbia as a faculty member, he joined Yokohama National University in 1986, and in 1996 he became a professor. He served as dean of the College of Engineering Science and Graduate School of Engineering from 2013 to 2015. He became Professor Emeritus in 2019 and is now a professor of endowed chair (Power Electronics) at the same university. He has served to the completion of 38 Ph.D., 147 Master’s, and 179 Bacheler’s students. He holds 7 patents and has published more than 140 journal papers, 320 international and 560 domestic conference papers, and 9 books. (h-index (Google) is 46.) His research interests include power electronics, digital control, electric vehicles, robotics, train traction control, etc. He received several awards, including several Transactions Prize Paper Awards from IEEE and IEEJ. Dr. Kawamura is a Fellow of the Institute of Electrical Engineers of Japan (IEE of Japan)
Robust Volt-Var Control in Power Distribution System
Bikash Pal, Imperial College London (ICL)
Abstract
Electrical generation, transmission, and distribution systems all over the world have entered a period of significant renewal and technological change. There have been phenomenal changes/deployments in the technology of generation, driven by the worldwide emphasis on energy from wind and solar as a sustainable solution to our energy needs. Increasingly, energy demand from heating and transportation is being met by electricity. These changes have significantly influenced the planning, design, operation, and control of the power distribution system. Accommodating uncertainties in renewable generation and demand forecast in a cost-effective manner is now a very complex optimization problem. This talk will share our recent research efforts on the Volt/VAr Control (VVC) strategy in distribution systems to address the uncertainties. The efficient chance-constrained conic optimisation technique accelerated through a scenario reduction approach will be discussed to demonstrate the significant reduction of voltage violations when compared with the deterministic cases while not relaxing the conservativeness of the final solutions. It will also touch upon the treatment of certain types of load characteristics in the proposed solution framework. Future research challenges and opportunities will be highlighted.
Speaker Biography
Bikash Pal is a Professor of Power Systems at Imperial College London (ICL). He is active in research on power system stability, control, and estimation. Currently, it is leading a six-university UK-China research consortium on Resilient Operation of Sustainable Energy Systems (ROSES) as part of the EPSRC-NSFC Programme on Sustainable Energy Supply. He led a UK-China research consortium project on power network stability with grid-scale storage (2014–2017). He also led an eight-university UK-India research consortium project (2013–2017) on smart grid stability and control. His research is conducted in strategic partnership with ABB, GE Grid Solutions, UK, and National Grid, UK. UK Power Networks. GE commissioned a sequel of projects with him to analyse and solve wind farm HVDC grid interaction problems (2013–2019). Prof. Pal was the chief technical consultant for a panel of experts appointed by the UNFCCC CDM (United Nations Framework Convention on Climate Change Clean Development Mechanism). He has offered trainings in Chile, Qatar, the UAE, Malaysia, and India on power system protection, stability, and control topics. He has developed and validated a prize-winning 68-bus power system model, which now forms a part of IEEE Benchmark Systems as a standard for researchers to validate their innovations in stability analysis and control design. He was the Editor-in-Chief of IEEE Transactions on Sustainable Energy (2012–2017) and Editor-in-Chief of IET Generation, Transmission, and Distribution (2005–2012). He is Vice President, PES Publications (2019–). In 2016, his research team won the President’s outstanding research team award at Imperial College London (ICL). He is a Fellow of the IEEE for his contribution to power system stability and control and a Fellow of the Royal Academy of Engineering, UK. He is an IEEE Distinguished Lecturer in Power Distribution System Estimation and Control. He was). He has published about 100 papers in IEEE Transactions and IET journals and authored four books in power system modelling, dynamics, estimations, and control. Two of his papers on power system stability and control topics have received the annual Best Journal Paper Award. He was Otto Monsted Professor at Denmark Technical University (DTU) (2019) and Mercator Professor sponsored by the German Research Foundation (DFG) at the University of Duisburg-Essen in 2011. He worked as a faculty member at IIT Kanpur, India. He holds a visiting professorship at Tsinghua University, China.
Digitalization as enabler of the Energy Transition
Santiago Bañales, Iberdrola Innovation Middle East
Abstract
The current energy transition entails two key developments in the sector: a radical increase in the share of renewable energy, mainly solar and wind power, in the final energy mix and the electrification of demand, in particular the transportation, heating, and industrial sectors. This keynote will showcase how digital technologies such as Artificial Intelligence, Machine Learning, Cloud and Edge computing are being used by energy industry leaders to improve the productivity of generation and electrical network assets, increase the penetration of renewables in the energy system, and provide tools to the final customer to be an active player in the energy transition.
Speaker Biography
Santiago Bañales is Managing Director of Iberdrola Innovation Middle East (ME), Iberdrola’s global development center of digital solutions for the energy industry, since 2016. He has 25 years of energy industry experience fulfilling executive roles in R&D, Product Development, Management Consulting, M&A, General Management and Board Directorships. Previous to his current role, Santiago was CEO of Ormazabal Current, a global smart grids product manufacturing with facilities in US, Switzerland and Spain. Santiago holds a MSc in Technology and Policy form MIT, a Dual Engineering degree from Ecole Centrale Paris and Universidad Politécnica de Madrid and an INSEAD International Board Director certification.
IEEE-ENERGYCON 2024 