PHOTOVOLTAIC POWER GENERATION SYSTEM AND FAULT PROTECTION METHOD AND DEVICE THEREOF, COMBINER BOX, AND INVERTER

Provided are a photovoltaic power generation system and a fault protection method and device thereof, a combiner box, and an inverter. The method includes: disconnecting, when there are co-positive power conversion units or co-negative power conversion units in the plurality of power conversion units and the protection switch units corresponding to the co-positive power conversion units or the co-negative power conversion units share a protection switch when connected to their corresponding photovoltaic string units, part or all of the plurality of protection switch units in response to detecting a fault in the photovoltaic power generation system, such that at most two photovoltaic strings in each of the corresponding photovoltaic string units are connected in parallel. When the protection switch units corresponding to the co-positive power conversion units or the co-negative power conversion units are disconnected, their corresponding photovoltaic strings are disconnected separately by at least three protection switches.