In view of the issue of three-phase voltage imbalance due to imbalance of three phase power and different output impedance during the operation of islanded microgrid

the voltage balance control strategy of islanded microgrid based on combined three-phase inverter is proposed in this paper. On one hand

the combined three-phase inverter is used as the interface circuit of the distributed power supply so to achieve the independent control of each bridge. On the other hand

the traditional droop control is improved by adjusting the P～F and Q～U droop curves to obtain three-phase balance reference voltage. In addition

the issue of voltage asymmetry due to different output impedance is improved further by way of introducing impedance voltage drop compensation control in this paper. Finally

the simulation and experiment are carried out at load balance and unbalance conditions respectively. It is shown by the result that the proposed integrated voltage control strategy is feasible and effective.