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Prof.Dr.Hasan KÖMÜRCÜGİL Eastern Mediterranean University, Turkey hasan.komurcugil@emu.edu.tr
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Prof. Dr.-Ing. Marco Liserre University of Kiel (Christian-Albrechts-Universität zu Kiel), Germany
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Prof.Dr.Hasan KÖMÜRCÜGİL
Title: Lyapunov-Function-Based Control Method for Power Converters
Abstract: Existing classical linear control methods developed for power converters are derived from the linearized model of the converter. In this case, the stability is guaranteed when the converter operates around the operating point and disturbances are small. However, when the operating point of the converter is changed by load variations and large signal disturbances, the stability may not be preserved by the linear control methods. Lyapunov’s stability theory method has gained significant importance in the research community. This method is based on formulating a Lyapunov function, an energy-like function, in terms of the error variables of the converter under consideration. The error variables belong to energy storage components like inductors and capacitors. The idea behind this control method is to derive a control law (usually nonlinear), without linearizing the converter model, which assures the derivative of Lyapunov function to be always negative. In this case, the stabilization of converter can be achieved not only in the vicinity of the operating point, but also away from the operating point of the converter. Lyapunov’s stability theory can also be applied to linear systems. In this talk, the design of Lyapunov-based control methods will be explained for various power converters such as AC-DC PWM rectifiers, UPS inverters, grid-connected inverters, and shunt active power filters. The perforance of Lyapunov-based control method will be demonstrated by simulation and experimental results obtained from these applications.
Short Biography: Hasan Komurcugil (Senior Member, IEEE) received the B.Sc., M.Sc. and Ph.D. degrees from the Eastern Mediterranean University (EMU), Famagusta, North Cyprus, Via Mersin 10, Turkey, in 1989, 1991, and 1998, respectively, all in electrical engineering. He is currently full-time Professor with the Computer Engineering Department, EMU. From 2004 to 2010, he was the Head of the Computer Engineering Department, EMU. In 2010, he played an active role in preparing the department's first self-study report for the use of Accreditation Board for Engineering and Technology. In 2010, he was elected as the as the Board Member of Higher Education, Planning, Evaluation, Accreditation and Coordination Council (YODAK) North Cyprus. From 2010 to 2019, he played active role in evaluating the universities in North Cyprus. His research interests include power electronics and innovative control methods for power converters such as sliding mode control, Lyapunov-based control, and model predictive control. He is a coauthor of one book (Multilevel Inverters: Introduction and Emergent Topologies) chapter. He was the recipient of the best presentation recognitions at the 41st and 42nd annual conferences of the IEEE Industrial Electronics Society (IECON) in 2015 and 2016, respectively. He is a member of the IEEE Industrial Electronics Society and Senior Member of the IEEE. Also, he is the Chair of the Renewable Energy Systems Subcommitee of Power Electronics Technical Committee of IES. He served as the Corresponding Guest Associate Editor of the IEEE TRANSACTIONS ON ENERGY CONVERSION and Guest Editor of the IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS. Currently, he serves as the Associate Editor of the IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS and the IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS.
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Prof. Dr.-Ing. Marco Liserre
Title: Modulation and control of modular power converters for high-power applications
Abstract: In this presentation modular power converters made by series or parallel connection of basic conversion cells are discussed respect to their application-specific challenges and to the possibility to tackle them through modulation and control approaches. As a consequence applications in the field of power quality, regenerative energies and HVDC are considered. These high power applications have often conflict requirements in terms of high efficiency, reliability and high bandwidth. Moreover power system aspects related to the connection of hybrid grids and their protections are also considered and addressed at power converter level. The presentation reports examples from strategic projects developed to support the so called "Energie Wende" (Energy Change) in Germany, where technologies for enabling a 100 % sustainable society are studied in cooperation with major companies in the field.
Short Biography: Marco Liserre (S'00-M'02-SM'07-F´13) received the MSc and PhD degree in Electrical Engineering from the Bari Polytechnic, respectively in 1998 and 2002. He has been Associate Professor at Bari Polytechnic and from 2012 Professor in reliable power electronics at Aalborg University (Denmark). From 2013 he is Full Professor and he holds the Chair of Power Electronics at Kiel University (Germany). He has published 500 technical papers (1/3 of them in international peer-reviewed journals) and a book. These works have received more than 35000 citations. Marco Liserre is listed in ISI Thomson report “The world’s most influential scientific minds” from 2014. He has been awarded with an ERC Consolidator Grant for the project “The Highly Efficient and Reliable smart Transformer (HEART), a new Heart for the Electric Distribution System”. He is member of IAS, PELS, PES and IES. He has been serving all these societies in different capacities. He has received the IES 2009 Early Career Award, the IES 2011 Anthony J. Hornfeck Service Award, the 2014 Dr. Bimal Bose Energy Systems Award, the 2011 Industrial Electronics Magazine best paper award and the Third Prize paper award by the Industrial Power Converter Committee at ECCE 2012, 2012, 2017 IEEE PELS Sustainable Energy Systems Technical Achievement Award and the 2018 IEEE-IES Mittelmann Achievement Award.
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