Mixed dynamic power quality compensation control and its application on industrial power distribution network

In order to improve the power quality of distribution network and realize power energy saving,integrating the predominance of active and passive compensators,a new low-cost high-efficiency and dynamic mixed compensation system is proposed.The active part was used to suppress flicker and harmonic based on the characters of fast and controllable,and the passive part was used to realize large capacity and low-cost step compensation.According to the rule of reactive power should balanced in every voltage rank,thyristor control reactance(TCR),thyristor switched capacitor(TSC),chain link static var generator(CLSVG) and mulriple static var generator(MSVG) were applied to different sites for different loads in a melt factory.A decision has been proposed to control the constitution of SVG and TSC to solve the question of reactive power compensation conflict,and a new method based on different frequency on different period was applied to control MSVG to improve the harmonic suppress effect.A universal converter controller was developed to satisfy the different control functions.All of power indexes were improved,and the electric power energy saving rate is 36.8% after the proposed system was put into operation.