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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摘要

针对孤岛交流微电网中的分布式储能系统（DESS）采用传统的P-f下垂控制时出现的荷电状态（SOC）不平衡问题,提出一种分布式下垂控制。该方案通过在传统的P-f下垂控制基础加入SOC平衡因子控制逆变器输出的有功功率,从而实现不同容量的DESS充电和放电过程中SOC平衡,并且在SOC平衡过程中频率不会发生偏移。当SOC平衡以后,SOC平衡因子为1,控制算法自动变为传统的P-f下垂控制。由于下垂系数一般很小,频率可以保持在规定的范围（±1%）内。此外,通过调节SOC的下垂系数,可以调节SOC的平衡速度。最后,不同工况下的仿真和实验结果验证了所提方案的有效性。

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	吴青峰
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	李昕

关键词 ：微电网, 分布式储能系统, 下垂控制, SOC平衡

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

收稿日期: 2017-04-14 出版日期: 2018-03-28

PACS:

TM46

基金资助:

中国重点研发项目基金（2016YFB0900300）,国家自然科学基金（51677162）和河北省自然科学基金（E2015203407、E2017203337）资助项目

作者简介: 吴青峰男,1987年生,博士研究生,研究方向为新能源并网及控制技术,电能质量治理。E-mail: 827211907@qq.com;孙孝峰男,1970年生,教授,博士生导师,研究方向为变流器拓扑及控制、新能源并网和电能质量控制。E-mail: sxf@ysu.edu.cn（通信作者）

引用本文:

吴青峰, 孙孝峰, 王雅楠, 徐德勋, 李昕. 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[J]. 电工技术学报, 2018, 33(6): 1247-1256. Wu Qingfeng, Sun Xiaofeng, Wang Yanan, Xu Dexun, Li Xin. A Distributed Control Strategy for SOC Balancing of Distributed Energy Storage Systems in Microgrid. Transactions of China Electrotechnical Society, 2018, 33(6): 1247-1256.

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

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