首页|Limits of Uneven Battery Power in Modular Multilevel Converter-based Battery Energy Storage Systems
Limits of Uneven Battery Power in Modular Multilevel Converter-based Battery Energy Storage Systems
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国家科技期刊平台
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For modular multilevel converter-based battery en-ergy storage systems(MMC-BESS),uneven power among bat-teries of SMs will be deduced by battery aging,battery fault,etc.,which will degrade performance and even lead to system failure.For maintaining the balance of capacitor voltage,this paper analyzes the limits of the uneven power of batteries,which are presented as the current limits in this paper.According to analysis,an analytical method is proposed that only the dc and fundamental frequency components of the arm current are used to calculate current limits.With the current limits it is able to evaluate the reasonability of power distribution among batteries.Meanwhile,increase of fundamental frequency component will enhance the current limits,and the dc component determines the size relationship between the absolute values of the upper and lower current limits.Finally,simulation model and experiment prototype are built for verifying the theoretical analysis and current limits calculation method,and satisfactory results are provided.
Arm currentbalance of capacitor voltagecurrent limitsMMC-BESSuneven power
Yao Pan、Xiaofeng Sun、Wei Zhao、Xin Li、Yao Cai
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Institute of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China
国家科技期刊平台
NSTL
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