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Keynote Address 1
Prof. Frede Blaabjerg
Aalborg University, Aalborg, Denmark
“Power Electronics – The Key Technology For Renewable Energy System Integration”
The energy paradigms in many countries (e.g., Germany and Denmark) have experienced a significant change from fossil-based resources to clean renewables (e.g., wind turbines and photovoltaics) in the past few decades. The scenario of highly penetrated renewable is going to be further enhanced– Denmark expects to be 100 percent fossil-free by 2050. Consequently, it is required that the production, distribution and use of the energy should be as technologically efficient as possible and incentives to save energy at the end-user should also be strengthened. In order to realize the transition smoothly and effectively, energy conversion systems, currently based on power electronics technology, will again play an essential role in this energy paradigm shift. Using highly efficient power electronics in power generation, power transmission/distribution and end-user application, together with advanced control solutions, can pave the way for renewable energies. In light of this, some of the most emerging renewable energies — , e.g., wind energy and photovoltaic, which by means of power electronics are changing character as a major part in the electricity generation —, are explored in this paper. Issues like technology development, implementation, power converter technologies, control of the systems, and synchronization are addressed. Special focuses are paid on the future trends in power electronics for those systems like how to lower the cost of energy and to develop emerging power devices and better reliability tool.
Biography: 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 was a Ph.D. Student with Aalborg University, Aalborg, Denmark. He became an Assistant Professor in 1992, an Associate Professor in 1996, and a Full Professor of power electronics and drives in 1998. His current research interests include power electronics and its applications such as in wind turbines, PV systems, reliability, harmonics and adjustable speed drives. He has published more than 450 journal papers in the fields of power electronics and its applications. He is the co-author of two monographs and editor of 4 books in power electronics and its applications. He has received 18 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 and the Villum Kann Rasmussen Research Award 2014. 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. He is nominated in 2014, 2015 and 2016 by Thomson Reuters to be between the most 250 cited researchers in Engineering in the world.
Keynote Address 2
Prof. Sanjib Kumar Panda
“High – altitude Wind Energy Harvesting”
Among various renewable energy sources, development of the wind power generating system has been extensive over the last two decades. The size of the turbine has increased by 10 fold from 10 m to 100 m to increase the generated electrical power. In order to increase power generated from the wind turbine, only size of wind turbine has been increased till date. However, high speed and streamlined wind enables higher power generation with a small size turbine at higher capacity factor. The wind speed increases with increase in the altitude from the earth’s surface. The mechanism of harvesting wind power from high altitude wind is less explored till date.
This talk would highlight an electrical system for a blimp/aerostat based High Altitude Wind Power (HAWP) generating system. Two different power generation and transmission mechanisms are proposed and their performance evaluation would be presented. A medium voltage AC generation and transmission based electrical system with aluminium power cable is found to be the optimal choice for generation and transmission of HAWP. In addition, variation in power-to-weight (P/W) ratio with respect to altitude and power rating of the HAWP generation system would also be presented and the optimal operating altitude is determined. The transmitted electrical power is interfaced to the load/grid using a suitable power conversion system (PCS) at the ground-based station. Two different PCSs and their control mechanisms are proposed and simulated. The proposed PCSs provide generation side maximum power-point tracking (MPPT) of the air-borne wind turbine, step-down of voltage and isolation operation of medium-voltage (MV) and low-voltage (LV) side, and active power control on the grid side. The proposed PCS for medium power rating consists of a three-level neutral point clamp (NPC) rectifier, an intermediate three-level NPC DC-DC converter, and a two-level inverter. On the other hand, for low power rating HAWP generating system, the proposed PCS consists of a three-level Vienna rectifier, a half-bridge DC-DC converter, and a two-level inverter. The generation-side and grid-side control mechanisms are also investigated and their performances are evaluated. Scaled-down laboratory prototypes are built and tested to validate the proposed control strategies. Experimental test results would be presented.
Biography: Sanjib Kumar Panda (S’86-M’91-SM’01) received B. Eng. Degree from the South Gujarat University, India, in 1983, M.Tech. degree from the Indian Institute of Technology, Banaras Hindu University, Varanasi, India, in 1987, and the Ph.D. degree from the University of Cambridge, U.K., in 1991, all in electrical engineering. He was the recipient of the Cambridge-Nehru Scholarship and M. T. Mayer Graduate Scholarship during his PhD study (1987-1991). Since 1992, he has been holding a faculty position in the Department of Electrical and Computer Engineering, National University of Singapore and currently serving as an Associate Professor and Director of the Power & Energy Research Area. Dr. Panda has published more than 300 peer-reviewed research papers, co-authored one book and contributed to several book chapters and holds six patents. His research interests include high-performance control of motor drives and power electronic converters, condition monitoring and predictive maintenance, building energy efficiency enhancement etc. He is serving as an Associate Editor of several IEEE Transactions e.g. Power Electronics, Industrial Electronics and Transportation Electrification and IEEE Journal of Emerging and Selected Topics in Power Electronics.