Research on control strategy of 3AC380V off-grid inverter

Through the analysis of the main circuit topology and control strategy of the three-phase inverter power supply, this paper puts forward a double closed-loop control strategy of voltage and current for three-phase inverter power supply based on the resonant regulator. The outer voltage loop ensures that the output alternating voltage keeps stable, while the inner current loop limits the current amplitude and improves the response speed of the system. Through theoretical analysis, the adjustment parameters of the controller are obtained to realize the accurate control of the output voltage of the power supply. The resonant controller is adopted to alleviate possible distortions of output voltage and suppress harmonics, such as to ensure the sinusoidal form of the output voltage. The effectiveness of the control strategy is verified by simulation and experiment.