Abstract
Large scale utilization of solar energy helps promotion of carbon neutrality progress. Photovoltaic power generation system (PVPGS) connects to the grid through converters. However, the PVPGS may trip from the grid under fault since large voltage dip will significantly enlarge the output current of the converter which may exceed the maximum allowable value. Low voltage ride-through (LVRT) control can help the PVPGS keep connecting to the grid and support grid voltage during fault. However, its optimal design has not been addressed sufficiently. Given this problem, the mathematic model of PVPGS is built and the control formulas are analyzed first. Secondly, the impact of grid fault on the transient characteristics of PVPGS is analyzed to address the key factors during fault ride-through process. Finally, a comprehensive LVRT control strategy is proposed to suppress the DC side voltage and supply reactive power for grid supporting. Simulation results prove the effectiveness of proposed strategy.
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