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For grid-connected inverters, the feedforward of the grid voltage at the point of common coupling (PCC) highly suppresses the grid current harmonics caused by the grid distortion; however, when the PCC grid is weak with non-negligible grid impedance, the feedforward of the PCC voltage arouses serious current harmonics or even instability. In order to maintain the stability in the weak grid case, the...
This paper proposes a fault-ride-through (FRT) method for a single-phase grid-connected inverter with a minimized inductor by reducing the inverter output current overshoot. When a low-inductance interconnected inductor is used, the inverter output current overshoot becomes very high at a voltage sag and a voltage recovery. Therefore, a grid-voltage fault stops the operation of the grid-connected...
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 impedance-based stability criterion is usually used to evaluate the performance of a current-controlled inverter in the weak grid with considerable grid impedance at the point of common coupling (PCC). The stability of the real inverter-grid system is the same as the virtual system where the ratio of the grid impedance and the inverter output impedance is the open-loop transfer function. However,...
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