A decoupling technique to improve the efficacy of the vector control model for SSSC

In this paper a decoupling technique for improving the vector control model of SSSC is presented. In the present vector models for SSSC, which are based on d-q line currents so called indirect control methods, there is a coupling between d and q axis, and therefore a coupling between P & Q control channel is seen. Obviously it would be more interesting to completely separate the controlled parameters which in the case of a SSSC are active and reactive powers in such a way that the deviation of one of the parameters affects the other one as least as possible. By the technique presented here, an independent control of P and Q is achieved while other control parameters of the SSSC (such as rise time, settling time, overshoot and ...) are also improved and a faster and more precise response is achieved. Simulation results are presented to prove the validity of this technique