PHOTOVOLTAIC SYSTEM, POWER SUPPLY SYSTEM, AND CONTROL METHOD

Abstract

The present application discloses a photovoltaic system, a power supply system, and a control method. A first inverter has a first input end connected to a second end of a direct-current positive bus, and a second input end connected to a second end of a neutral bus; a second inverter has a first input end connected to the second end of the neutral bus, and a second input end connected to a second end of a direct-current negative bus; and a controller is used for controlling, during startup and shutdown, a voltage of the direct-current positive bus to the ground, a voltage of the direct-current negative bus to the ground, and a voltage of the neutral bus to the ground to be less than or equal to a preset voltage threshold, so as to ensure personal and device safety. During startup, shutdown, and working of the photovoltaic system, the controller controls the startup and shutdown sequence of each device in the photovoltaic system, and ensures that the voltages of three direct-current buses to the ground cannot exceed the requirements of a safety voltage, so as to ensure the personal and device safety. If overvoltage occurs during working of the photovoltaic system, the photovoltaic system needs to be protected in time to avoid the expansion of a fault range.

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Applicants

IPC Classification

H02J 3/ 12 A I H02J 3/ 38 A I