基于分布式协同的双极直流微电网不平衡电压控制策略

doi:10.19595/j.cnki.1000-6753.tces.200026

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摘要双极直流微电网正、负极直流负荷的变化会导致直流母线电压偏离额定值,使正、负极电压出现不平衡,由此产生的不平衡电流还会增加网络损耗。为协调不同分布式电源参与直流微电网的不平衡电压控制,控制电压不平衡度在合理范围内或某一限定值,保证系统的稳定运行,该文以电压下垂控制作为一次控制,再基于一致性理论和电压不平衡度与正、负极电压之间的函数关系,建立不平衡电压观测器和不平衡度控制器,设计集成母线平均电压和不平衡度的一致性控制的二次控制,以形成双极直流微电网的不平衡电压分布式协同控制,实现极间电压不平衡度趋于一致和母线平均电压维持在额定值。该文分析了该控制策略下双极直流微电网的稳定性,在Matlab/Simulink中搭建了仿真模型,并搭建实验平台,验证了该文控制策略的有效性。

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	杨美辉
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关键词 ：双极型, 直流微电网, 不平衡电压, 分布式协同

Abstract：The change of positive and negative DC loads of a bipolar DC microgrid will cause the DC bus voltage to deviate from the rated value, causing the positive and negative voltages to be unbalanced, and the unbalanced current generated by it will also increase the network loss. In order to coordinate different distributed power sources to participate in the unbalanced voltage control of the DC microgrid, control the voltage unbalance degree within a reasonable range or a certain limit value, and ensure the stable operation of the system. In this paper, the voltage droop control is used as the primary control, and an unbalanced voltage observer and a voltage unbalance factor controller are established based on the consensus algorithm and the function relationship between voltage unbalance factor and the positive and negative voltage, which as a secondary control to integrate the consensus control of the bus average voltage and the unbalance factor, and the distributed cooperative control of the unbalanced voltage in the bipolar DC microgrid is formed to achieve the convergence of the voltage unbalance factor between poles and the average bus voltage is maintained at the rated value. The stability of the bipolar DC microgrid under the control strategy is analyzed, and the simulation model is built-in MATLAB/Simulink, and the experimental platform is set up to verify the effectiveness of the control strategy.

Key words： Bipolar DC microgrid unbalanced voltage distributed cooperation

收稿日期: 2020-01-08

PACS:

TM721

基金资助:国家自然科学基金（51877017）和国家重点研发计划（2018YFB0904600）资助项目

通讯作者: 杨美辉女,1995年生,硕士研究生,研究方向为直流微电网的保护与控制。E-mail：meihuiyang@cqu.edu.cn

作者简介: 周念成男,1969年生,博士,教授,研究方向为电力系统自动化和电能质量。E-mail：cee_nczhou@cqu.edu.cn

引用本文:

杨美辉, 周念成, 王强钢, 廖建权, 孟潇潇. 基于分布式协同的双极直流微电网不平衡电压控制策略[J]. 电工技术学报, 2021, 36(3): 634-645. Yang Meihui, Zhou Niancheng, Wang Qianggang, Liao Jianquan, Meng Xiaoxiao. Unbalanced Voltage Control Strategy of Bipolar DC Microgrid Based on Distributed Cooperation. Transactions of China Electrotechnical Society, 2021, 36(3): 634-645.

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