考虑经济调度及电压恢复的直流微电网分布式二次控制  

Distributed Secondary Control for Economic Dispatch and Voltage Restoration of DC Microgrid

作　　者：李忠文 程志平[1] 张书源 王要强[1] 司纪凯 Li Zhongwen;Cheng Zhiping;Zhang Shuyuan;Wang Yaoqiang;Si Jikai(School of Electrical Engineering Zhengzhou University,Zhengzhou 450001 China)

机构地区：[1]郑州大学电气工程学院,郑州450001

出　　处：《电工技术学报》2021年第21期4482-4492,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(61803343);河南省科技厅科技攻关(202102210096,202102210296,212102210011)资助项目。

摘　　要：基于下垂控制的直流微电网初级控制存在稳态母线电压偏差和电流难以准确分配的缺点,传统采用集中式或分布式的二次控制策略虽然可以实现直流微电网母线电压恢复和电流均分,但并没有考虑各分布式发电单元的发电成本。为提高直流微电网的稳定性和运行效率,基于分布式一致理论,设计了分布式平均母线电压恢复控制算法和分布式最优负荷分配算法,并基于上述算法设计了直流微电网新型分布式二次控制策略。该控制策略可以在二次控制层同时实现母线电压恢复和经济调度,从而提高微电网的运行效率。另外,该控制策略完全分布式实施具有更好的灵活性、鲁棒性和可扩展性。The droop-based primary control of DC microgrid shows the drawbacks of steady-state bus voltage deviation and inaccurate current sharing. Although, the traditional centralized or distributed secondary control strategy can achieve bus voltage restoration and accurate current sharing. However,the generation cost of each DG unit is not considered in the traditional control strategy. In order to improve the stability and operation efficiency of DC microgrid, distributed average bus voltage recovery control algorithm and distributed optimal load distribution algorithm were designed based on distributed consensus theory. Based on the proposed distributed secondary control, bus voltage restoration and economic dispatch can be achieved simultaneously in the secondary control layer, thus the operational efficiency of microgrid can be improved. In addition, the proposed control strategy can be achieved in a fully distributed way, which shows the advantages of flexibility, robustness and scalability.

关 键 词：直流微电网 分布式一致 二次控制 经济调度 电压恢复控制 多智能体 

分 类 号：TM761[电气工程—电力系统及自动化]