Abstract
Power grid in remote areas may show the feature of weak grid with time-variable impedance. Robustness of control of grid connected inverter (GCI) to grid impedance is one of the key technologies. For grid connected inverters with voltage feed-forward and time delay, IMC (Internal Model Controller) is used so that the adaptability to the grid impedance is improved. Detailed IMC and its parameter design method are provided, theoretical analysis and simulation results verify that IMC has robustness of grid and LCL impedance.
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