Research on control strategy of three-phase four-quadrant PWM rectifier

Based on the analysis of the main circuit topology and mathematical model of three-phase four-quadrant PWM rectifier, this paper puts forward a control strategy with double closed-loop of voltage and current for the four-quadrant rectifier, which can realize the bi-directional flow of energy. Phase-locked loop based on second-order generalized integrator are designed to ensure that the phase-locked loop operates precisely, even if the grid voltage distorts obviously. The effectiveness of the control strategy is verified by simulations and experiments.