LINKAGE PROTECTION SYSTEM AND METHOD FOR PHOTOVOLTAIC POWER STATION

This application discloses a linkage protection system and method for a photovoltaic power station. The system includes an inverter, an anti-potential induced degradation PID module, and an insulation monitoring module. The anti-PID module is configured to inject a voltage into an input end or an output end of the inverter, to increase or decrease a voltage to earth of a photovoltaic system. The insulation monitoring module is configured to inject an insulation monitoring voltage into a direct current side or an alternating current side of the inverter. The anti-PID module and the insulation monitoring module directly or indirectly communicate with each other, to learn of information about whether a peer module is operating, and perform linkage control, so that the anti-PID module and the insulation monitoring module alternately operate in different time periods. The anti-PID module and the insulation monitoring module operate in different time periods, to avoid a problem that the insulation monitoring module gives an abnormal insulation alarm when a voltage injected when the anti-PID module operates is detected by the insulation monitoring module. In addition, the system may realize an anti-PID function, and may further detect an insulation fault, to improve power generation efficiency of the photovoltaic power station and ensure safety of the photovoltaic power station.