Study of a low voltage reactive power dynamic compensation device with continuously adjustable capacity

Abstract

Abstract A dynamic reactive power compensation device with continuously adjustable capacity is designed for low voltage power grid. According to the time requirement of reactive power dynamic compensation for capacitor switching, a signal generating circuit of voltage/current zero-crossing triggering switching is designed. A capacitor combination method to improve the compensation accuracy and the control strategy to change the compensation power of capacitor by adjusting voltage are put forward. The hardware structure of compensation device, reactive power compensation control mode, capacitor switching control method and capacitor output power regulation method are designed. Using Matlab/Simulink, the simulation results show that the proposed method can realize continuous reactive power adjustment according to the set power factor.