孤岛微电网分布式电压不平衡补偿控制策略

针对不平衡负载、故障等引起的微电网公共连接点电压不平衡问题,提出了一种基于多代理系统的分布式协调电压不平衡补偿控制策略。将微电网各分布式电源等效为多代理系统中的代理,利用领导节点产生只有少数代理能够接收的补偿信号参考,公共连接点电压不平衡补偿等效为各代理节点向领导节点同步的追踪同步问题。利用线性状态反馈设计了分布式控制率。该控制策略基于一个单向通信的有向通信网络,各代理只需处理本地及相邻代理信息。该控制策略避免了对集中控制器的依赖,提高了系统的可靠性。利用一个微电网测试系统对所提控制策略进行了验证,仿真结果表明所提控制策略能够有效抑制公共连接点电压不平衡度。

Distributed Control Strategy for Voltage Unbalance Compensation in Islanded Microgrid

A multi-agent system(MAS)based distributed cooperative control strategy for voltage unbalance compensation in the islanded microgrid is proposed to deal with the voltage unbalance at the point of common coupling(PCC)due to unbalanced loads or faults. The distributed generators(DGs)in the microgrid are equivalent to the agents in a networked MAS. And the reference of compensation signal is produced by a leader node connected only to a small portion of the agents. Thus the voltage unbalance compensation design resembles a tracking synchronization problem. The distributed control rate is designed using linear state feedback. This control strategy relies on a directed one-way communication graph. Each agent only deals with local information and that from its neighborhood. This kind of control strategy obviates the requirement for a central controller, which, in turn, improves the reliability. The effectiveness of the proposed control strategy is verified by a microgrid test system. The simulation results show that the proposed control strategy can effectively suppress the voltage unbalance at PCC. This work is supported by National High Technology Research and Development Program of China(863 Program)(No. 2015AA050603)and Fundamental Research Funds for the Central Universities(No. 2016XS01).