Abstract

Three-phase four-leg photovoltaic (PV) inverters suffer from active and reactive power fluctuations under unbalanced grid faults. This paper proposes improved control schemes for a three-phase four-leg grid connected PV inverter under unbalanced grid faults by controlling the positive- and negative-sequence currents. Enhanced control strategies which utilize the positive- and negative-sequence components are suggested to mitigate the double grid frequency oscillations in the active power output or reactive power output of the four-leg PV inverter. Simulation studies are carried out using the DIgSILENT Power Factory software to verify the effectiveness of control strategies.

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