At first, through analysis of the system performance and the mathematics matrix of STATCOM, we introduced the voltage of the point where STATCOM jointed in the system as state variable.
A variable structure controller for Static var Compensator (SVC) which can improve power Angle stability of power system and local voltage characteristics of SVC is proposed.
The result of simulation shows that the proposed variable structure controller can improve dynamic characteristics of system more effectively in contrast to conventional voltage controller of SVC.