孤岛微电网的分布式有限时间事件触发二次协调控制

针对传统的下垂控制策略会导致孤岛微电网稳态角频率和电压偏离额定值,且其依赖周期性通信的问题,提出一种孤岛微电网的分布式有限时间事件触发二次协调控制.首先基于多智能体系统的追踪一致性,即以系统稳态电压和角频率参考值为虚拟领航者,视分布式电源(DG)为多智能体系统的智能体,来实现系统电压和角频率的恢复控制以及期望的有功功率比例分配.然后设计了分布式有限时间事件触发二次协调控制,且只在事件触发时刻进行信息交换,其余时刻利用状态估计器输出代替DG实际状态.采用李雅普诺夫方法分析了所提策略的稳定性和可行性.最后在MATLAB/Simulink中搭建孤岛微电网测试系统进行仿真分析,仿真结果及理论分析验证了所提控制方法的有效性和优越性.

Distributed finite-time event-triggered secondary coordinated control of islanded microgrids

For the problems of the steady-state angular frequency and voltage deviated from the rated value of islanded microgrid caused by the traditional droop control strategy and the dependence on periodic communication, a distributed finite-time event-triggered secondary coordinated control is proposed. Firstly, based on the tracking consistency of the multi agent system, taking the system steady-state voltage and angular frequency reference value as the virtual leader and regarding DG(Distributed Generator) as the agent of the multi agent system to achieve the recovered control of the system voltage and angular frequency and the desired active power sharing property. Then, a distributed finite-time event-triggered secondary coordinated control is designed, in which information is exchanged only at the moment of event-triggered time, and the output of the state estimator is used to replace the actual state of DG at the rest time. The Lyapunov method is used to analyze the stability and feasibility of the proposed strategy. Finally, an islanded microgrid test system is built in MATLAB/Simulink for simulation analysis, simulative results and theoretical analysis verify the effectiveness and superiority of the proposed control method.