Optimal Power Allocation for Parallel Grid-Connected Inverters Based on Lagrangian Function Method

Chinese Journal of Electrical Engineering ›› 2017, Vol. 3 ›› Issue (3): 68-76.

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Optimal Power Allocation for Parallel Grid-Connected Inverters Based on Lagrangian Function Method

Weidong Jiang^1,*, Peixia Wang², Jinping Wang¹, Lei Wang¹

1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, 230009, China;
2. Department of Information Engineering, Hefei University of Technology Xuancheng Campus, Xuancheng, 242099, China

Online:2017-09-25 Published:2019-11-01
Contact: * E-mail:ahjwd@163.com.
About author:Weidong Jiang (M'15) was born in Sichuan, China, in 1976. He received the B.S. and the Ph.D degree in electrical engineering. from Hefei university of Technology, Hefei, China, in1999 and 2004, respectively. Since June 2004, he has been with the School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China, where he is currently a Professor. His research interests include electrical machines and their control systems, power electronics, and electric drives. Peixia Wang was born in Anhui, China, in 1991. She received the B.S. degree from the department of electrical engineering, Anhui University of Engineering, Wuhu, China, in 2015. She is working toward the M.S. degree in the Department of Information Engineering, Hefei university of Technology Xuancheng Campus, Xuancheng, China. Her main research interests include power electronics, and power converters in renewable energy. Jinping Wang (M'16) was born in Hunan, China, in 1984. He received the B.S. degree in electronic and information engineering and the Ph.D. degree in electrical engineering from Southwest Jiaotong University, Chengdu, China, in 2007 and 2013. Since June 2013, he has been with the School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China, where he is currently an Associate Professor. His main research interests include modeling, analysis, control and applications of switching-mode power supplies. Lei Wang was born in Anqing, Anhui Province, China,in 1993 He received the B.Sc. degree from the Department of Electrical Engineering and Automation, Anhui University, Hefei, China, in 2016. He is currently working toward the M.S. degree in the Department of Electrical Engineering, Hefei university of Technology, Hefei, China. His research interests include application of power converters in renewable energy and power quality.

Abstract

Abstract: Two parallel grid-connected inverters can increase system capacitance effectively. In order to exert maximum efficiency of parallel grid-connected inverters, an optimal power allocation (OPA) method is proposed. Firstly, the power model of every inverter is established. Compared with the equal power allocation (EPA) method, theoretically, higher overall system efficiency can be achieved with the OPA method. Secondly, the overall system efficiency can be calculated with easily measurable electric parameters, and the online optimization realized by adopting an existing method, such as the hill-climbing method. Lastly, the feasibility of the OPA method is verified by simulation and experimentation.

Key words: Power allocation, efficiency optimization, parallel inverters

Weidong Jiang, Peixia Wang, Jinping Wang, Lei Wang. Optimal Power Allocation for Parallel Grid-Connected Inverters Based on Lagrangian Function Method[J]. Chinese Journal of Electrical Engineering, 2017, 3(3): 68-76.

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Optimal Power Allocation for Parallel Grid-Connected Inverters Based on Lagrangian Function Method

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