Overview on Resonance Characteristics and Resonance Suppression Strategy of Multi-Parallel Photovoltaic Inverters

Chinese Journal of Electrical Engineering ›› 2016, Vol. 2 ›› Issue (1): 40-51.

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Overview on Resonance Characteristics and Resonance Suppression Strategy of Multi-Parallel Photovoltaic Inverters

Xing Zhang^*, Changzhou Yu, Fang Liu, Fei Li, and Haizhen Xu

School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, 230009, China

Online:2016-01-20 Published:2019-10-31
Contact: *, E-mail: honglf@ustc.edu.cn.
About author:Xing Zhang received the B.S., M.S., and Ph.D. degrees in electric engineering and automation from Hefei University of Technology, Hefei, China, in1984, 1990, and 2003, respectively. In 1984, he joined the School of Electric Engineering and Automation, Hefei University of Technology, where he is currently a Professor and is also at the Photovoltaic Engineering Research Center of Ministry of Education. He is a senior member of IEEE, and an Associate Editor for the IEEE Journal of Emerging and Selected Topics in Power Electronics. He has been cooperating with the Sun grow Power Supply Co., Ltd for a long time in the area of power electronics. His main research interests include photovoltaic generation technologies, wind power generation technologies, and distributed generation system.
Changzhou Yu received the B.S. degree in electric engineering and automation from Hefei University of Technology, Hefei, China, in 2009. He is currently working toward the Ph.D. degree in electric engineering and automation in Hefei University of Technology. His current research interests include control of photovoltaic converters, parallel converter systems, and photovoltaic generation technologies.
Fang Liu received the B.S., M.S. and Ph.D. degrees in electrical engineering from Hefei University of Technology (HFUT), Hefei, China, in 2005, 2008 and 2015, respectively. In 2015, she joined the teaching faculty of the School of Electrical Engineering and Automation, HFUT. From April. 2008 to Aug. 2009, she served as a software engineer at EMERSON network (Xi’an) Power. From Oct. 2011 to Oct.2012, she served as a Visiting Scholar at the Lab of WEMPEC, University of Wisconsin, Madison, America. Her research interests include the PV generation system, storage energy system, Micgrid system, energy management system, and grid-tied converters.
Fei Li received the B.S. and Ph.D. degrees in electric engineering and automation in 2008 and 2015 from Hefei University of Technology, Hefei, China. Since 2015, he has been a Faculty Member of the School of Electric Engineering and Automation, Hefei University of Technology. His current research interests include filter topology and parameter design, Harmonic mitigation in parallel converter systems, and photovoltaic generation technologies.
Haizhen Xu received the B.S. degrees in electric engineering and automation from Hefei University of Technology, Hefei, China, in 2010. She is currently working toward the Ph. D. degree in electric engineering and automation in Hefei University of Technology. Her current research interests include control of VSG converters, parallel converter systems, and photovoltaic generation technologies.
Supported by:
Supported by the key program of National Natural Science Foundation of China under Grant 51277051.

Abstract

Abstract: Photovoltaic(PV) inverters have been widely used in large-scale PV power generation systems to reduce the system mismatch and increase the output power. With the increasing installed capacity of PV power stations, the number of string PV inverters increases, which brings about risk of inverter resonance and influences the quality and stability of multi-parallel inverters grid-connected system. Thus, the problems of multi-parallel inverters resonance have become a hot research topic. This paper is focused on the case of grid-connected string PV inverter systems, and the grid-connected PV inverter resonance where resonance suppression strategy will be analyzed and discussed. Firstly, the structure of string PV inverter and multi-parallel inverters system are presented. Secondly, discussions are made about the model of multi-parallel inverters system and its resonance characteristics based on the multi-input-multi-output(MIMO) system, Norton equivalent circuit and carrier synchronization. Thirdly, two strategies of “inverter level” and “system level” are provided to summarize the multi-parallel inverters resonance suppression strategy. Finally, the development tendency of resonance suppression strategy and conclusions are prospected.

Key words: String PV inverters, multi-parallel inverters resonance, resonance characteristics, Resonance suppression strategy

Xing Zhang, Changzhou Yu, Fang Liu, Fei Li, and Haizhen Xu. Overview on Resonance Characteristics and Resonance Suppression Strategy of Multi-Parallel Photovoltaic Inverters[J]. Chinese Journal of Electrical Engineering, 2016, 2(1): 40-51.

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Overview on Resonance Characteristics and Resonance Suppression Strategy of Multi-Parallel Photovoltaic Inverters

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