静止同步补偿器的解耦控制策略

Decoupling Control Strategy of STATCOM

静止同步补偿器(STATCOM)可以起到稳定接入点电压,有效地降低网损率和提高功率因数及防止非线性负荷的作用。但是STATCOM在dq坐标系下是一个非线性、强耦合的系统,为了保证输出电流快速无差地跟踪整定值需要对其进行解耦。通过对STATCOM基本结构进行分析,得到了耦合项的模型。采用模糊免疫PI控制和逆系统相结合的方法,对原系统进行线性化的解耦,避免了有功和无功电流的耦合作用。最后运用MATLAB进行仿真。仿真结果表明,所提解耦控制策略具有性能优良、结构简单、容易实现的优点。

Static Synchronous Compensator （STATCOM） can stable point voltage,effectively reduce the net loss rate and improve the power factor and prevent the nonlinear load.Under the circumstance of d-and q-axis,STATCOM is a system which is non-linear,strong coupling,so decoupling control is very useful,because it can ensure output current quickly track setting value,through the analysis of its basic structure,the model of the coupling term can be got.Fuzzy immune PI controller and inverse system method are be combined together to solve the original system coupling,and avoid active and reactive current coupling.Finally,use the MATLAB simulation,the results show that the proposed decoupling control strategy is performance,the structure is simple and easy to implement.