Protection adaptability analysis method for photovoltaic grid-connected generating system

Abstract Inverter power sources such as photovoltaic inverters and SVG have unique fault characteristics compared to traditional synchronous motors due to their unique power generation methods, circuit topology, and low-voltage traversal control strategies. The power grid faces various adverse effects due to the ongoing expansion of photovoltaic power station (PV power station) capacity. How to comprehensively analyze the impact of photovoltaic power stations above 1000 MW on power grid relay protection has become a problem. Therefore, a protection adaptability analysis method for photovoltaic grid-connected generating systems is proposed, which is suitable for engineering analysis before the connection of large-capacity PV power stations to ensure the safety of the power system. And it is found that current differential protection exhibits better adaptability than distance protection.