Damping Control Strategy for Reducing Voltage Unbalance in Three-Phase Inverter

In view of single-phase and three-phase load coexist in low-voltage distribution network, causing unbalance of the three phase voltages, this paper proposed a damping control strategy based on three-phase inverter to reduce voltage unbalance factor. The mathematical model of the active power damping control strategy of the inverter is established based on the sequential component method. By analyzing the principle of active power output and voltage unbalance suppression, the active and reactive power cooperative damping control strategy for three phase inverters was deduced. Case studies are carried out on a 10 bus asymmetric distribution network. The results verify that the control strategy proposed of the inverter in this paper which can realize power output and reduce the voltage unbalance of the network.