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State-of-charge Balance Control and Safe Region Analysis for Distributed Energy Storage Systems with Constant Power Loads
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This paper presents a fully distributed state-of-charge balance control(DSBC)strategy for a distributed energy storage system(DESS).In this framework,each energy storage unit(ESU)processes the state-of-charge(SoC)information from its neighbors locally and adjusts the virtual impedance of the droop controller in real-time to change the current sharing.It is shown that the SoC balance of all ESUs can be achieved.Due to virtual impedance,voltage deviation of the bus occurs inevitably and increases with load power.Meanwhile,widespread of the constant power load(CPL)in the power system may cause instability.To ensure reliable operation of DESS under the proposed DSBC,the concept of the safe region is put forward.Within the safe region,DESS is stable and voltage deviation is acceptable.The boundary conditions of the safe region are derived from the equivalent model of DESS,in which stability is analyzed in terms of modified Brayton-Moser's criterion.Both simulations and hardware experiments verify the accuracy of the safe region and effectiveness of the proposed DSBC strategy.
Constant power load(CPL)distributed controldistributed energy storage system(DESS)safe regionstate-of-charge(SoC)
Yijing Wang、Yangzhen Zhang、Zhiqiang Zuo、Xialin Li
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Department of Electrical and Information Engineering,Tianjin University,Tianjin 300384,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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