基于自抗扰控制技术的光储微电网无功支撑策略

Reactive Power Support Strategy of Photovoltaic/battery Microgrid Based on ADRC

针对光储微电网运行中负荷投切、分布式电源的波动性等引起的并网点电压上升/跌落超出上/下限的问题,提出一种基于自抗扰控制(active disturbance rejection control,ADRC)技术的光储微电网无功支撑控制策略,充分利用储能单元的无功调节能力提供快速有效的无功电压支撑,使并网点电压保持在限值范围内。仿真结果验证了该策略的有效性和可行性,所设计基于ADRC的双环无功支撑控制器具有超调小、响应速度快、控制精度高、抗扰能力强等优点,其控制效果和鲁棒性均优于传统基于PI的控制器。

In order to solve the problem of voltage rising or dropping caused by load switching, and distributed power fluctuation in photovoltaic/battery microgrid, a reactive power support control strategy of photovoltaic/battery microgrid based on active disturbance rejection control(ADRC) technique is proposed in this paper. It takes full advantage of the reactive power regulation capability of energy storage units to provide reactive support for power grid rapidly and effectively, keeping PCC(point of common coupling) voltage within limits. Simulation results demonstrate efficacy and feasibility of the proposed strategy. Double loop reactive power support controller based on ADRC is proved to have small overshoot, fast response, high accuracy in voltage control and strong disturbance rejection, showing better control effect and robustness than traditional PI controller.