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利用基尔霍夫定律建立STATCOM开关函数模型,采用反馈线性化解耦控制方法,实现STATCOM非线性系统有功电流和无功电流的解耦,并基于线性控制理论中的极点配置方法为解耦线性化模型设计了控制器;并根据瞬时无功功率理论对负载线路中的无功电流进行动态实时检测,作为STATCOM补偿无功功率的给定,实现对无功变化负载的快速响应。仿真实验结果表明,所设计的控制系统实现了对STATCOM的有效控制,保持其直流端口电压稳定于给定值,控制系统具有补偿精度高、动态响应快的优点。
The Kirchhoff’s law is used to establish the switch function model of STATCOM, and the feedback linearization decoupling control method is used to decouple the active current and the reactive current of the STATCOM non-linear system. Based on the pole placement method in linear control theory, In the model, the controller is designed. According to the instantaneous reactive power theory, the reactive current in the load line is dynamically detected in real time, which can be used as STATCOM to compensate the reactive power, so as to realize the rapid response to reactive load. The simulation results show that the designed control system realizes the effective control of STATCOM and keeps the DC port voltage stable at a given value. The control system has the advantages of high compensation accuracy and fast dynamic response.