Aiming at the distortion of grid-side current when the three-phase high-power photovoltaic grid-connected inverter is running with unbalanced grid voltage, a control strategy based on the positive-sequence dq coordinate system is proposed to suppress the unbalanced negative-sequence current of the grid-connected inverter. Based on the study of the influence of grid voltage imbalance on the operating performance of photovoltaic grid-connected inverter, a space vector PWM (SVPWM) control algorithm with feedforward decoupling is proposed. Simulation and experiments show that this control strategy effectively suppresses the grid-side current distortion of photovoltaic grid-connected inverter when the grid voltage is unbalanced, and improves the system operating performance.
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