In distribution network,Distribution Static Synchronous Compensator (D-STATCOM) can stable access point voltage,reduce the net loss rate effectively and improve the power factor and prevent the nonlinear load.In d-and q-axis.D-STATCOM is a non-linear,strong coupling system,so decoupling control is very useful,because the decoupling control can ensure the output current fast without poor track setting value.Study the decoupling control strategy of D-STATCOM,through the analysis of its basic structure,which has the model of the coupling term linear decoupling.Fuzzy immune PI control and feed-forward decoupling control strategy are combined together to achieve active and reactive current decoupling.Finally,use the MATLAB simulation,the results show that the proposed decoupling control strategy is performance、the structure is simple and easy to implement.%在配电网中,静止无功补偿器(D-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D-STATCOM在d-q坐标系下是一个非线性、强耦合的系统,需要进行解耦控制,因为对其进行解耦控制可以保证输出电流快速无差地跟踪整定值.研究D-STATCOM的解耦控制策略,通过对其基本结构进行分析,得到了耦合项的模型.采用模糊免疫PI控制和前馈解耦控制相结合的方法将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,所提解耦控制策略性能优良、结构简单、容易实现.
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