Control system of static var generator based on sliding variable structure

The PQ discrete-time decoupled model for the ASVG(Advanced Static Var Generator)controller is researched for the rapid decoupled control of the active power and the instantaneous reactive power.Based on it,a double￣loop control system is designed for the ASVG.The internal loop is to control the power,and a changing reaching law method in discrete sliding variable structure control is proposed to reduce the system chattering,ensure the asymptotic stability of the system in steady state and improve the robustness of the colse￣loop system.The external loop is to control the DC(Direct Current) capacitor voltage.A single neure adaptive PI(Proportional Integral) control is adopted for the voltage control,which adapts itself to online system parameter changes for avoi￣ding disturbances and keeping capacitor voltage almost constant during instantaneous reactive power exchange.Simulations verify its effectiveness.