Abstract
A novel voltage sag generator (VSG) is proposed for grid-connected photovoltaic (PV) systems low voltage ride-through (LVRT) test. The topology and parameters of the current-limiting reactor group, grounding reactor group and bi-directional thyristor valve of the VSG is designed to generator voltage sags with several sag depths and phase angles. Furthermore, for a 250kW grid-connected PV inverter modeled by real-time digital simulator (RTDS), LVRT simulations in different sag depths at different phase angles are done with the VSG. Simulation results show that the proposed VSG has reasonable design and can reveal adequately how the voltage sag depths and phase angles influent the LVRT results.
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