Research on Power Distribution Control of Parallel Inverters in Off-grid Mode

Abstract The power distribution of inverters in parallel operation is uneven due to the difference in line impedance. In this paper, the parallel operation of two inverters is taken as an example, the power distribution mechanism is derived and the relevant mathematical model is established, and the influencing factors of the parallel inverter power distribution are analyzed. Then, the virtual impedance is introduced based on the voltage and current double closed-loop of the photovoltaic inverter, and an improved strategy based on the virtual impedance is proposed. Finally, PLECS simulation proves the effectiveness of the proposed method.