PHOTOVOLTAIC SYSTEM AND DIRECT-CURRENT OVERCURRENT PROTECTION APPARATUS

This application provides a photovoltaic system and a direct current overcurrent protection apparatus. The photovoltaic system includes at least one first direct current module, an electromagnetic apparatus, a direct current switch-on/off apparatus, and a second direct current module. First connection ends of all first direct current modules in the at least one first direct current module are connected in parallel and then connected to a first connection end of the electromagnetic apparatus, a second connection end and a third connection end of the electromagnetic apparatus may be connected to a first connection end of the second direct current module by using the direct current switch-on/off apparatus, and second connection ends of all the first direct current modules may be connected in parallel and then connected to a second connection end of the second direct current module. The electromagnetic apparatus may be configured to: when a current flows from the second direct current module to each first direct current module and an amplitude of the current is greater than a preset amplitude, control the direct current switch-on/off apparatus to disconnect a loop between each first direct current module and the second direct current module. Based on this application, overcurrent protection may be performed for a reverse current flowing to each first direct current module. In this way, costs are low. This is applicable.