IEEE Power & Energy Society Technical Webinar Series
Thyristor-Bypassed Sub-Module Power-Groups for Achieving High-Efficiency, DC Fault Tolerant Multilevel VSCs
April 5, 2018, • 10:00 am EST
Presented by Professor Dragan Jovcic, Ph.D., University of Aberdeen
Paul Judge, Ph.D., Imperial College
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This webinar will present the best paper selected from the IEEE Trans. Power Delivery special section “Frontiers of DC technology”. The webinar will also provide an overview the papers published in the special section The paper to be presented introduces a new thyristor-augmented multilevel structure called a Power-Group (PG), which replaces the stacks of SMs in modular converters. Each PG is formed out of a series stack of SMs with a parallel force-commutated thyristor branch, which is used during normal operation as a low loss bypass path in order to achieve a significant reduction in overall losses. The PG also offers negative voltage capability and so can be used to construct high-efficiency DC fault tolerant converters. Estimates indicate that this concept could result in converter topologies with power losses as low as 0.3% rated power while retaining high-quality current waveforms and achieving tolerance to both AC and DC faults.
Dragan Jovcic (S'97-M'00-SM'06) obtained a Diploma Engineer degree in Control Engineering from the University of Belgrade, Serbia in 1993 and a Ph.D. degree in Electrical Engineering from the University of Auckland, New Zealand in 1999. He is currently a professor with the University of Aberdeen, UK. In 2008 he held a visiting professor post at McGill University, Canada. Prof Jovcic is a senior member of IEEE, IEEE PES Distinguished Lecturer, and editor of IEEE Transactions on Power Delivery. Professor Jovcic is a member several CIGRE working groups and chairman of B4.76. He is founder and director of Aberdeen HVDC research centre. Prof Jovcic has around 120 publications and he is author of a book on HVDC: “High Voltage Direct Current Transmission: Converters, Systems and DC Grids”, Wiley, 2015.
Paul D. Judge (M’13) received the B.Eng. (Hons.) degree in electrical engineering from the University College Dublin, Dublin, Ireland, in 2012, and the Ph.D. degree in power converter design for HVDC applications in 2016 from the Control & Power Group in Imperial College London, London, U.K., where he is currently a Research Associate. His research interests include power converter design and control, as well as power system integration aspects of HVDC technology.