Inverter Design and Droop Parallel Control Strategy Based on Virtual Impedance

Abstract

The present work is aimed at improving the performance of the multiobjective energy parallel step-by-step power generation system and enhancing the reliability and stability of the energy supply. Firstly, the difficulties of the ring current control method of the inverter power supply are summarized. Secondly, the causes of ring current in the circuit are analyzed. On this basis, the topology structure of the primary circuit of the inverter unit is designed, and the simulation model of the droop control is proposed for the inverter power supply. Finally, experiments are implemented to test the performance of the model. The results demonstrate that the waveform quality of the output voltage of the parallel system controlled by the virtual impedance technology is significantly improved. Specifically, the harmonic content near the fundamental wave significantly decreases compared with the original, from 6% to about 2%. Besides, the interference of the ring current to the parallel control inverter of the power supply system is weakened, and the output stability of the inverter power supply is improved. This study designs the structure of the inverter converter based on multiobjective decision-making and discusses the droop parallel control strategy. It provides a specific reference for controlling the circuit parallel system and has positive promotion significance for sustainable energy management and the rational utilization of electric energy.