Review of Power Decoupling Methods for Micro-Inverters Used in PV Systems

Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (4): 26-32.

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Review of Power Decoupling Methods for Micro-Inverters Used in PV Systems

Yonggao Zhang^*, Jian Xiong, Peng He, Shuai Wang

School of Electrical Engineering and Automation, East China Jiaotong University, Nanchang 330013, China

Online:2018-12-25 Published:2019-10-31
Contact: *E-mail:z.y.gao@163.com.
About author:Yonggao Zhang was born in Jiangxi, China, in 1975. He received the M.S. degrees in Electrical Engineering from East China Jiaotong University, Nanchang, P.R.China, in 2003 and Ph.D. degrees in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, P.R.China in 2007. From 1997 to present, he was on the faculty of East China Jiaotong University (ECJTU). Now, he serves as an Associate Professor in School of Electrical and Automation Engineering, ECJTU. His research interests are in the area of 1. Power electronic apparatus and its control, PV micro-inverter and control and LED Driver. Jian Xiong was born in Jiangxi, China. He received the B.S degree in electrical engineering from Xinyu College, Xinyu, China, in 2015. He is currently working toward the M.S degree in electrical engineering from East China Jiaotong University, Nanchang, China. His research interests include power decoupling technique, renewable-energy applications and multi-port converters. Peng He was born in Jiangxi, China. He received the B.S degree in electrical engineering from University of South China, in 2013. He is currently working toward the M.S degree in electrical engineering from East China Jiaotong University, Nanchang, China. His research mainly involves power decoupling technique for photovoltaic grid-connected inverter, micro-inverter without electrolytic capacitor. Shuai Wang was born in Hunan, China. She received the B.S degree in electrical engineering from Hunan institude of engineering College, Xiangtan, China. She is currently working toward the M.S degree in electrical engineering from East China Jiaotong University, Nanchang, China.Her research interests include power decoupling technique, renewable-energy applications and AC/DC LED drivers.
Supported by:
Supported by National Natural Science Funds(51467006, 51467005),Science and Technology Industrial Planning Project of Jiangxi Province,China (20151BBE50118, 20161BBH80032) and Science and Technology Project of Education Department in Jiangxi Province (GJJ160489).

Abstract

Abstract: In single-phase photovoltaic(PV) systems, power mismatch between input and output terminal leads to power pulsation, seriously affecting maximum power point tracking (MPPT). Paralleling an electrolytic capacitor(e-cap) across the PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifespan. Various power decoupling methods used in micro-inverters have been proposed to solve the problem. These methods were categorized. Some of them were introduced in this paper regarding efficiency, cost and technical features. Special novel methods proposed in recent years were presented to show the development trend of micro-inverter. Then, conclusion and comparisons were made. Finally, a potential technological route was proposed by author for further study on power decoupling.

Key words: Photovoltaic, micro-inverter, power decoupling, MPPT

Yonggao Zhang, Jian Xiong, Peng He, Shuai Wang. Review of Power Decoupling Methods for Micro-Inverters Used in PV Systems[J]. Chinese Journal of Electrical Engineering, 2018, 4(4): 26-32.

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Review of Power Decoupling Methods for Micro-Inverters Used in PV Systems

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