基于三环反馈解耦控制策略的储能元件在风光互补微网系统中的应用

摘要

Energy storage component plays an important role in the operation and control process of microgrid which consists of wind and solar. It can be used as a main networking power in the islanded operation of microgrid, in order to maintain the system voltage and frequency stability. For energy storage component controller, a tricyclic feedback control strategy which consists of a power ring, a filter capacitor voltage ring and a filter inductor current ring is designed. And its role in the process of the stable operation of the microgrid and the island / network switching is analyzed. A microgrid system including the energy storage components, wind power and photovoltaic is simulated in MATLAB, and an experimental platform is established. Simulation and experimental results show that the control strategy can maintain voltage and frequency stability of the microgrid in islanding, networking, and the process of switching. It can also achieve a smooth switch between island/network mode of microgrid.%　　储能元件在风光互补发电系统组成的微网运行控制过程中具有重要地位，可以作为微网孤岛运行的组网电源，从而维持系统的电压和频率稳定。对于储能元件控制器，设计了一种包括功率环、逆变器滤波电容电压环以及滤波电感电流环的三环反馈解耦控制策略，分析了该策略在微网稳定运行和孤岛/联网模式无缝切换过程的作用。利用Matlab仿真了由储能元件、风电和光伏组成的微网系统并且建立了实验平台。仿真及实验结果表明，基于该控制策略的微网在孤岛运行、联网运行以及两者切换的过程中能够保持电压和频率稳定性，对微网内负荷供电可靠，并可实现微网孤岛/联网两种模式的平滑切换。