基于分布式多代理系统的孤岛微电网二次电压控制策略

Secondary Voltage Control in an Islanded Microgrid Based on Distributed Multi-Agent System

微电网是实现分布式电源灵活管理和控制的有效手段,相比传统集中式二次控制方式,分布式协调二次控制策略具有更高的灵活性和可靠性。提出一种基于分布式多代理系统的孤岛微电网二次电压控制策略,将分布式电源看作系统中的代理,二次电压控制等效为多代理系统的追踪同步问题。基于线性状态反馈设计了分布式控制器,其中采用状态估计器输出代替系统实际状态,进而利用事件触发控制器更新系统状态。利用一定的通信网络,各代理利用本地及相邻代理的信息相互协调保证微电网电压恢复额定值,避免了对集中控制器的依赖。该控制策略允许各代理仅在事件触发时刻交换信息而非实时连续交换,减少了交换数据的信息量,降低了对通信网络的要求。利用一个孤岛微电网测试系统对所提控制策略的有效性进行了验证。

Microgrid is one of the most effective means to manage and control the distributed generation flexibly.Compared to the traditional central secondary control for voltage,the distributed cooperative way is more flexible and reliable.A secondary voltage control in an islanded microgrid based on multi-agent system is proposed.The distributed generation is represented by the agent,and consequently the researched target is converted to a synchronization problem.The distributed controller is designed based on linear states feedback,in which the actual states are replaced by outputs of the estimators and the event-triggered controllers are used to update the estimators.Each of the agents restores the voltages of the islanded microgrid to the normal value in a cooperative way using a communication network without central controller.Inter agent communication is only activated when events are triggered.Thus inter-agent communication is reduced and the requirement to the communication network is lowered.The effectiveness of the proposed control strategy is verified using an islanded microgrid test system.