Abstract
In photovoltaic grid-connected inverter based on the deadbeat current control, the filter inductance variation and one-step-delay control affect the distortion of the grid current, stability and dynamic of the system. In this paper, a fast robust PWM method for photovoltaic grid-connected inverter is proposed, which reduces the distortion of the grid current caused by the filter inductance variation, effectively solves the delay of the one-step-delay control, and improves the stability and dynamic response speed of the system. Considering the parasitic resistance of the filter inductance and the line equivalent resistance, the influence of the filter inductance deviation coefficient on the system performance is analyzed, and the appropriate control parameter range is given. Simulation and experimental results verify the effectiveness of the proposed method.
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