An Accurate Common-Mode Current Prediction Method for Transformerless Photovoltaic Inverters Based on Graph Theory

Chinese Journal of Electrical Engineering ›› 2017, Vol. 3 ›› Issue (3): 59-67.

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An Accurate Common-Mode Current Prediction Method for Transformerless Photovoltaic Inverters Based on Graph Theory

Yangbin Zeng¹, Hong Li^1,*, Bo Zhangg²,Zhichang Yang¹, Trillion Q. Zheng¹

1. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. School of Electric Power, South China University of Technology, Guangzhou 510641, China

Online:2017-09-25 Published:2019-11-01
Contact: * E-mail: hli@bjtu.edu.cn.
About author:Yangbin Zeng (S'16) was born in Hunan, China. He received the B.Sc. degree from Xiangtan University, Xiangtan, China, in 2015, where is currently working toward the Ph.D. degree in electrical engineering in the School of Electrical Engineering at Beijing Jiaotong University, Beijing, China. His main research interest includes transformerless photovoltaic grid-connected inverters and high gain step-up DC/DC converters. Hong Li (S'07-M'09) received the B.Sc. degree in electric automatization from Taiyuan University of Technology, Taiyuan, China, in 2002, the M.Sc. degree in electrical engineering from South China University of Technology, Guangzhou, China, in 2005, and the Ph.D. degree in electrical engineering and computer science from FernUniversität in Hagen, Germany, in 2009. Currently, She is a Professor in the School of Electrical Engineering, Beijing Jiaotong University, Beijing, China. She has published 1 book, 25 journal papers, and 41 conference papers. She has also applied for 20 patents. Her research interests include nonlinear modeling, analysis and its applications, EMI suppressing methods for power electronic systems, wide-bandgap power devices, and applications. Dr. Li is an associate editor for the Chinese Journal of Electrical Engineering and the Vice Chairman of Electromagnetic Compatibility Specialized in China Power Supply Society. Bo Zhang (M'03-SM'15) was born in Shanghai, China, in 1962. He received the B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 1982, the M.S. degree in power electronics from Southwest Jiaotong University, Chengdu, China, in 1988, and the Ph.D. degree in power electronics from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1994. He is currently a Professor and the Deputy Dean of the School of Electric Power, South China University of Technology, Guangzhou, China. He has authored or coauthored more than 380 papers and 80 patents. His research interests include nonlinear analysis and control of power supplies and ac drives. Zhichang Yang (S'15) was born in Chifeng, China, in 1991. He received the B.S. degree in electrical engineering from Beijing Jiaotong University, Beijing, China, in 2013, where is currently working toward the Ph.D. degree in electrical engineering in the School of Electrical Engineering. His current research interests include power electronics, electromagnetic interference, and chaos control and its applications. Trillion Q. Zheng (M'06-SM'07) was born in Jiangshan, Zhejiang Province, China, in 1964. He received his B.S. degree in Electrical Engineering from Southwest Jiaotong University, Sichuan, China, in 1986; and his M.S. and Ph.D. degrees in Electrical Engineering from Beijing Jiaotong University, Beijing, China, in 1992 and 2002, respectively. He is a University Distinguished Professor at Beijing Jiaotong University. He is the director of the Center for Electric Traction, sponsored by the Ministry of Education, China. His current research interests include the power supplies and AC drives of railway traction systems, high performance and low loss power electronics systems, and power quality corrections. He holds 24 Chinese patents and has published over 80 journal articles and more than 120 technical papers in conference proceedings. From 2003 to 2011, he served as Dean of the School of Electrical Engineering, Beijing Jiaotong University. He is serving as the Deputy Director of the Beijing Society for Power Electronics. He was a laureate of the Delta Scholar for Power Electronics and Motor Drives of the Delta Environmental and Educational Foundation and received many other provisional-level and national-level awards.

Abstract

Abstract: The common-mode current is an important indicator with transformerless photovoltaic inverters. However, up to now, there is not an accurate method to predict common-mode current in the inverter design process, resulting from inappropriate device selection or exceeded the expected common-mode current. In order to solve this problem, this paper proposes an accurate common-mode current prediction method based on graph theory for transformerless photovoltaic inverters. In this paper, the mathematic model of the common-mode current is derived using graph theory analysis method in the full-bridge topology, and it is used to predict common-mode current. The validity and correctness of the proposed prediction method are validated by simulation and experiment. The oscillation frequency and amplitude can be predicted by the proposed common-mode prediction method, whereas the traditional common-mode analysis method cannot. This paper provides a novel way to predict and analyze common-mode current in the transformerless photovoltaic inverters.

Key words: Common-mode current, transformerless photovoltaic inverters, prediction method, electromagnetic interference

Yangbin Zeng, Hong Li, Bo Zhang, Zhichang Yang, Trillion Q. Zheng. An Accurate Common-Mode Current Prediction Method for Transformerless Photovoltaic Inverters Based on Graph Theory[J]. Chinese Journal of Electrical Engineering, 2017, 3(3): 59-67.

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An Accurate Common-Mode Current Prediction Method for Transformerless Photovoltaic Inverters Based on Graph Theory

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