Research on Control Strategy of Photovoltaic Grid-Connected Inverter

Abstract

This paper presents a control strategy of three-phase grid inverter Based on space vector modulation. First, the model of the inverter was built in the two-phase rotating reference frame, then control principle was proposed Based on the space vector SPWM current control, which realize the grid current active component and reactive component of the independent control, and presents a decoupled current control and feed-forward of power grid voltage control. The simulation results verify that the proposed control strategy not only can improve the quality of grid current, but also can connect to grid with unity power factor.