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Low-voltage ride through (LVRT) is amongst the important attributes suggested by various grid codes for operation of photo-voltaic (PV) inverters. Asymmetric grid faults can hinder performance during LVRT due to their nature to introduce oscillations at the double grid frequency in active power and thus in DC-link voltage. This paper proposes a method for reducing the double grid frequency components from the inverter's i<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</inf> and i<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q</inf> currents in the presence of asymmetric faults resulting in reduced charging power fluctuations and eliminating DC overvoltage. Stable DC link voltage ensures steady power flow between PV panels and AC grid. The reduced oscillation will enhance reliability and life of capacitor.
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Tawada et al. (2024) studied this question.