基于模糊分数阶PID的含电动汽车的多能源微电网二次频率控制

为了解决分布式可再生能源间歇性发电和电动汽车接入微电网导致的微电网频率波动问题,针对含电动汽车接入的多能源微电网系统,设计了一种基于模糊自适应理论的分数阶比例-积分-微分(PID)二次频率控制器,通过建立模糊控制规则,结合频率偏差对模糊分数阶PID控制器参数进行实时在线整定.考虑光伏发电和风力发电输出功率波动、电动汽车接入微电网、随机负荷扰动3种不同场景,对所提出的模糊分数阶PID控制方法进行了仿真验证与量化分析.仿真结果表明,相比于传统PID控制器和分数阶PID控制器,所设计的模糊分数阶PID控制器使得系统频率响应振荡减少、超调量明显降低、动态调节时间更短,呈现出更强的抗扰动能力和鲁棒性,对于多能源微电网的二次频率调节具有优良的控制效果.

Secondary frequency control of multi-energy microgrid with electric vehicles based on fuzzy fractional-order PID

In order to solve the problems of microgrid frequency fluctuation caused by the connection of distributed intermittent renewable energy power generations and electric vehicles to microgrid, a fractional-order PID(Proportional Integral Differential) secondary frequency controller based on the fuzzy adaptive logic is designed. Through the fuzzy control rules, the parameters of the fuzzy fractional-order PID controller are set online in real time by combining with the frequency deviation. Considering three scenarios of the output power fluctuation of photovoltaic power generation and wind power generation, the connection of electric vehicles to microgrid, and the random load disturbances, the proposed fuzzy fractional-order PID control method is simulated, verified and analyzed quantitatively. Simulative results show that compared with the traditional PID controller and the fractional-order PID controller, the designed fuzzy fractional-order PID controller achieves fewer system frequency response oscillation, lower overshoot and shorter dynamic adjustment time, and shows stronger capacity of anti-disturbance and robustness, which has the excellent control effect for secondary frequency regulation of multi-energy microgrid.