FAULT PROTECTION DEVICE AND PHOTOVOLTAIC POWER GENERATION SYSTEM

This application relates to a fault protection apparatus and a photovoltaic power generation system. The photovoltaic power generation system includes a capacitor bridge arm, an inverter bridge arm, and the fault protection apparatus. The capacitor bridge arm includes a positive electrode output port, a negative electrode output port, and a reference output port between the positive electrode output port and the negative electrode output port. The inverter bridge arm includes a positive electrode input port, a negative electrode input port, and a reference input port between the positive electrode input port and the negative electrode input port. The positive electrode input port is connected to the positive electrode output port. The negative electrode input port is connected to the negative electrode output port. The reference input port is connected to the reference output port by using the fault protection apparatus. The fault protection apparatus is turned off based on a magnitude or a change status of a voltage, or a magnitude or a change status of a current between the reference input port and the positive electrode input port or the negative electrode input port.