Research on Inter-phase Capacitive Voltage Balance Method of STATCOM Under Virtual Synchronous Machine Control Strategy
In view of the inter-phase capacitive voltage unbalance of static synchronous compensator which is based on cascaded H-bridge topology under traditional control framework,a kind of method to balance the inter-phase capacitive voltage is proposed on the basis of the control strategy of virtual synchronous machine. Virtual synchronizer has the advantage of fast response which,however,will cause the inter-phase capacitive voltage unbalance when used for static synchronization compensator to compensate reactive power. Therefore,the average capacitive voltage is introduced to complete the fast grid connection of the virtual synchronizer. Then,the reactive power adjustment of the virtual synchronizer algorithm is divided into three parts to achieve the phase-split reactive power compensation. Moreover,the average capacitive voltage is introduced as feedback before the voltage synthesis to achieve the balance of inter-phase capacitive voltage. Finally,a simulation model is set up under Matlab/Simulink environment to verify that the proposed control strategy can effectively solve the issue of inter-phase capacitive voltage unbalance. The simulation results show that the proposed control strategy has good dynamic response characteristics.
static synchronous compensatorvirtual synchronizer control strategybalance of inter-phase capacitive voltagecascade H-bridge converter
万方数据
维普
