Abstract
In the grid-connected system, the stability of the grid-connected inverter (GCI) often suffers from the grid impedance, especially when connected to a weak grid. Using an impedance-based stability analysis method, this paper proposes an active capacitor converter (ACC) in parallel at the point of common coupling (PCC) to reshape the grid impedance, making the ratio of the reshaped grid impedance to the output impedance of GCI satisfy the Nyquist stability criterion. The ACC can guarantee the GCI to have high stability-robustness against wide-range grid impedance variation with low additional power losses and high power factor. Experimental results on a 6-kW prototype confirm the validity of the theoretical analysis.
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