基于分布式下垂控制的微电网分布式储能系统SOC平衡策略

doi:10.19595/j.cnki.1000-6753.tces.170436

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Abstract

When distributed energy storage systems (DESS) in islanded ac microgrid are controlled by conventional P-f droop control, the state-of-charge (SOC) of DESS is unbalanced. In order to balance the SOC of DESS with different capacities, a distributed droop control is proposed in this paper. The SOC balancing in the process of DESS charging and discharging can be realized without frequency deviation by adding a SOC balancing factor to the conventional P-f droop control. The value of SOC balancing factor is 1 after SOC balancing, and the control algorithm changes to the conventional P-f droop control automatically. Since the droop coefficient of conventional droop control is usually very small, the frequency can be kept within the specified range (±1%). Besides, the SOC balancing speed can be adjusted by changing the droop coefficient. Finally, the simulation and experimental results in different conditions show the effectiveness of the proposed scheme.

Key words： Microgrid distributed energy storage systems (DESS) droop control SOC balancing

Received: 14 April 2017 Published: 28 March 2018

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TM46

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	Articles by authors
	Wu Qingfeng
	Sun Xiaofeng
	Wang Yanan
	Xu Dexun
	Li Xin

Cite this article:

Wu Qingfeng,Sun Xiaofeng,Wang Yanan等. A Distributed Control Strategy for SOC Balancing of Distributed Energy Storage Systems in Microgrid[J]. Transactions of China Electrotechnical Society, 2018, 33(6): 1247-1256.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170436 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I6/1247

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