Control Strategy of MMC Battery Energy Storage System under Asymmetrical Grid Voltage Condition

Chinese Journal of Electrical Engineering ›› 2016, Vol. 2 ›› Issue (2): 76-83.

Control Strategy of MMC Battery Energy Storage System under Asymmetrical Grid Voltage Condition

Lei Zhang, Feng Gao^*, Nan Li

Key Lab of Power System Intelligent Dispatch and Control(Shandong University), Ministry of Education, Jinan, 250061, China

Online:2016-12-25 Published:2019-11-01
Contact: E-mail: fgao@sdu.edu.cn.
About author:Lei Zhang (S'13-M’16) received the B. Eng. in electrical engineering from Shandong University of Science and Technology, Qingdao, China, in 2012. He received the M.Eng. degree in electrical engineering from Shandong University, Jinan, China, in 2015. From 2015 to 2016, he joined the School of Electrical and Electronic Engineering, Nanyang Technological University, where he worked as a Research Associate. Currently, he is working toward the Ph.D degree at the Arizona State University, USA. His research interests include the modular multilevel converters (MMC), energy storage system, and hybrid AC-DC microgrid. Feng Gao (S'07-M’09) received the B.Eng. and M.Eng. degrees in electrical engineering from Shandong University, Jinan, China, in 2002 and 2005, respectively, and the Ph.D. degree from the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, in 2009. From 2008 to 2009, he was a research fellow in Nanyang Technological University. Since 2010, he joined School of Electrical Engineering, Shandong University, where he is currently a professor and serving as Vice Dean. From September 2006 to February 2007, he was a Visiting Scholar at the Institute of Energy Technology, Aalborg University, Aalborg, Denmark. Dr. Gao was the recipient of the IEEE Industry Applications Society Industrial Power Converter Committee Prize for a paper published in 2006, and he is now serving as an Associate Editor of the IEEE Transactions on Power Electronics. Nan Li Nan Li received the B.Eng degree in electrical engineering from Tianjin University, Tianjin, China, in 2011, and is currently working toward the Ph.D. degree in electrical engineering from Shandong University, Jinan, China. His research interests include MMC, energy storage system, BMS and MPC.

Abstract

Abstract: A battery energy storage system using modular multilevel converter (MMC) as the interfacing converter could have several inherent advantages when compared with battery energy storage systems based on two-level inverter or cascaded H-bridge converter. It can manage the state-of-charges (SOCs) of all batteries to be equal to avoid the overcharge or over discharge of single battery. The inherent power exchange characteristics using circulating currents could increase the control flexibility and consequently improve the output quality and the internal regulation capability. This paper investigates the operational principle and control strategy of MMC battery energy storage system under unbalanced grid voltage condition, where key issues of system model and corresponding control methods are very different from those under the normal grid voltage condition. The injected dc current control, SOC balancing control and circulating current control methods are fully discussed in this paper. Finally, the theoretical findings were verified through Matlab simulation and a scaled down experimental prototype.

Key words: Modular multilevel converters (MMC), battery energy storage system, circulating current, asymmetrical grid voltage

Lei Zhang, Feng Gao, Nan Li. Control Strategy of MMC Battery Energy Storage System under Asymmetrical Grid Voltage Condition[J]. Chinese Journal of Electrical Engineering, 2016, 2(2): 76-83.

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