中国电气工程学报（英文） ›› 2019, Vol. 5 ›› Issue (2): 32-42.

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  • 出版日期:2019-06-20 发布日期:1900-01-01

CSI and CSI7 Current Source Inverters for Modular Transformerless PV Inverters*

E. Lorenzani1, G. Migliazza1, F. Immovilli1, G. Buticchi2*   

  1. 1. DISMI-Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, Reggio Emilia Italy;
    2. Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China
  • Online:2019-06-20 Published:1900-01-01
  • About author:E. Lorenzani (S’03 - M’07) was born in Parma, Italy, in 1976. He obtained his M.S. degree in Electronic Engineering in 2002 and his Ph.D. in Information Technologies in 2006, both at the University of Parma, Italy. Since 2011 he has been at the Department of Science and Engineering Methods at the University of Modena and Reggio Emilia, where he is currently an Associate Professor of Elec- tric Machines and Drives. His research activity is mainly focused on power electronics for renewable energy resources, electric drives and electric motor diagnostics. He is the author or coauthor of more than 50 technical papers, and holds five industrial patents.
    G. Migliazza was born in Catanzaro, Italy, in 1987. He received the graduate degree in Mechatronic Engineering from University of Modena and Reggio Emilia in 2014. He is currently Ph.D Student at same university. His research interests include power electronics, converters and electric drives.
    F. Immovilli (S’08 - M’11) was born in Italy on March 11, 1981. He received the M.S. degree and the Ph.D. in Mechatronic Engineering at the University of Modena and Reggio Emilia in 2006 and 2011 respectively. In 2009 he was a Visiting Scholar at the Power Electronics, Machines and Control Group of the University of Nottingham, Nottingham, UK. In 2011 he joined the University of Modena and Reggio Emilia, Reggio Emilia, Italy, as a Research Fellow in Electric Converters, Machines and Drives at the Department of Sciences and Methods of Engineering. His research interests include electric machine diagnosis, power converters, machines for energy conversion from renewable energy sources and thermoacoustics. He holds two international industrial patent.
    G. Buticchi (S’10-M’13-SM’17) received the Master degree in Electronic Engineering in 2009 and the Ph.D degree in Information Technologies in 2013 from the University of Parma, Italy. In 2012 he was visiting researcher at The University of Nottingham, UK. Between 2014 and 2017 he was a post-doctoral researcher at the University of Kiel, Germany. He is now Associate Professor in Electrical Engineering at The University of Not- tingham Ningbo China. His research focuses on power electronics for renewable energy systems, smart transformer fed micro-grids and DC grids for the More Electric Aircraft. He is author/co-author of more than 170 scientific papers.
  • Supported by:
    buticchi@ieee.org

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Abstract: Current source inverter (CSI) is a class of power electronic converters that, thanks to the inherent boost capability and ease of control, is investigated for grid-tied photovoltaic power conversion applications. Traditional CSI and CSI7 topologies are here analyzed and compared with two kind of space vector modulation strategies mainly in terms of ground leakage current both in simulations and experiments. Furthermore, THD of the injected grid current and the computation of conduction and switching semiconductor power losses are also carried out in numerical simulations. The topology comparison is carried out with the use of a different number of PV modules, to analyze the robustness of the topologies to different size of the PV strings. Simulation and experimental results show that the CSI7 topology, with respect to conventional CSI, allows to strongly reduce ground leakage current, phase current THD and semicondutor power losses, at the price of an additional power device.

Key words: Current source inverter, photo-voltaic power systems, ground leakage current, renewable energy sources