STATCOM的小信号模型及控制研究

ompensating reactive power is the basic function of STATCOM. It connects self-commutated bridge circuit to the grid through transformer or shunt reactor. Appropriately adjust the bridge circuit ac voltage phase and amplitude , or directly control the ac current can make the circuit absorb or send reactive current accorded with requirement and realize the dynamic reactive compensation. The paper introduces the main circuit of STATCOM and establish a dynamic mathematical model of STATCOM. On this basis, the small signal model is established and linearization is done. The detection method and control method of STATCOM is the core part. The paper uses the decoupling control based on d - q vector transform detection method. The paper build the model in the MATLAB/simulink and get the simulation results. This paper assesses STATCOM dynamic compensation performance and the low-voltage power capacity is ±5kvar. Simulation results show that STATCOM has rapid response ,and works stably and reliably.