Optimization Design and Application Research on Low Voltage Ride-Through Technology for Fixed-Axis Photovoltaic Power Stations

Taking a 99 MWp horizontal single-axis photovoltaic power station project in a certain city of Croatia as an example, this study delves into the design and application effects of a coordinated low-voltage ride-through control technology for horizontal single-axis photovoltaic power stations. Engineering verification has shown that this solution significantly enhances the grid-connected stability of photovoltaic power stations, reducing the reactive current response delay from 120 ms to 22 ms. In a 0.55p.u. voltage dip test, it achieves zero grid disconnection with a synchronization error of less than 10 ms among inverter clusters. Therefore, research on low-voltage ride-through technology for horizontal single-axis photovoltaic power stations can address issues such as grid disconnection during power system faults, slow reactive power support response, and difficulties in system coordination control in traditional photovoltaic power stations. This study holds certain significance for promoting the integration of renewable energy and operational safety in regional power grids.