PHOTOVOLTAIC SYSTEM AND POWER SYSTEM

Abstract

Disclosed in the present application are a photovoltaic system and a power system. The photovoltaic system comprises a first inverter circuit, a second inverter circuit, and a switching circuit; a first input end and a second input end of the first inverter circuit are respectively connected to a direct-current positive bus and a neutral bus; a first input end and a second input end of the second inverter circuit are respectively connected to the neutral bus and a direct-current negative bus; and the switching circuit comprises a first state and a second state. When the switching circuit is in the first state, a first photovoltaic array is connected to the direct-current positive bus and the neutral bus by means of the switching circuit, and a second photovoltaic array is connected to the neutral bus and the direct-current negative bus by means of the switching circuit; and when the switching circuit is in the second state, the first photovoltaic array is connected to the neutral bus and the direct-current negative bus by means of the switching circuit, and the second photovoltaic array is connected to the direct-current positive bus and the neutral bus by means of the switching circuit. Changing the potential of each photovoltaic array avoids a PID effect caused by the photovoltaic array in a negative potential for a long time, the PID effect is suppressed, and the service life of a photovoltaic module is prolonged.

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Applicants

IPC Classification

H02S 40/ 30 A I