Study on SVC control for power systems with nonlinear loads

The paper describes an exact linearization technique for multi input power systems with nonlinear loads. The nonlinear differential algebraic systems (NDAS) considered are not in general state variable form. The definitions of M derivative and M bracket similar to the definitions in classic differential geometric theory and some related revised results are given. M derivative and M bracket are used to obtain the feedback control law for the NDAS. The approach is used to design a nonlinear controller of SVC in single-machine infinite system with nonlinear loads. The simulation result shows that the nonlinear controller of SVC has better ability to improve the damping and voltage level than the conventional PID controller. Furthermore, the control law is even superior when the nonlinear loads vary.