基于电压分层控制的直流微电网及其储能扩容单元功率协调控制策略  

Coordinated Power Control Strategy for DC Microgrid and Storage Expansion Unit Based on Voltage Hierarchical Control

作　　者：郭慧 汪飞 顾永文 李玉菲 Guo Hui;Wang Fei;Gu Yongwen;Li Yufei(Shanghai Key Lab of Power Station Automation Technology,School of Mechatronics Engineering and Automation,Shanghai University,Shanghai,200444,China)

机构地区：[1]上海大学机电工程与自动化学院上海市电站自动化技术重点实验室,上海200444

出　　处：《电工技术学报》2022年第12期3117-3131,共15页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51977126);中国博士后科学基金(2020M681262)资助项目。

摘　　要：由于直流微电网中的分布式发电具有随机性和波动性等特点,储能单元的配合可较好地解决这一问题。但是,现有基于直流母线电压信号的分层控制未充分考虑多储能单元的协调以及孤岛系统容量不足的情况。因此,该文提出一种基于电压分层控制的直流微电网及其储能扩容单元功率协调控制策略。为实现电压分层下多储能单元的分散协调控制,该文首先揭示已有微电网系统不同运行模式所对应的负载功率边界。然后,提出基于多储能单元荷电状态(SOC)的改进模糊控制和下垂控制,以实现多储能单元充放电功率自适应分配。针对孤岛系统容量不足的情况,在储能扩容单元容量计算的基础上,提出一种基于过/欠电压控制器的储能扩容单元功率协调控制策略,并分析其对已有系统功率边界的影响,以保证直流微电网安全可靠运行。最后,通过仿真和实验结果验证了所提控制策略的可行性和有效性。The collaboration of storage units can better solve the randomness and volatility of distributed power generation in DC microgrids.However,the existing hierarchical control based on the DC bus voltage signal doesn’t fully consider the coordination of multiple storage units and the insufficient capacity of islanding systems.Therefore,a coordinated power control strategy for DC microgrid and storage expansion unit based on voltage hierarchical control is proposed.In order to realize the decentralized coordination of multiple storage units under the voltage hierarchical control,the load power boundary corresponding to different operation modes of the existing microgrid is revealed firstly.Then,the improved fuzzy control and droop control based on the SOC of multiple storage units are proposed to realize the adaptive allocation of charging and discharging power.For the insufficient capacity of islanding systems,a power control strategy based on the over/under voltage controller is proposed for storage expansion units according to the capacity calculation,and its influence on the power boundary of the existing system is analyzed,to ensure the safe and reliable operation of DC microgrids.Finally,simulation and experimental results verify the feasibility and effectiveness of the proposed control strategies.

关 键 词：直流微电网 储能单元荷电状态(SOC) 电压分层控制 储能扩容控制 

分 类 号：TM721[电气工程—电力系统及自动化]