Power supply system

Abstract

Provided in the present application is a power supply system. The system comprises a direct-current bus, an AC-DC conversion circuit, a load circuit, an energy storage unit and a partial power conversion circuit. The AC-DC conversion circuit converts an alternating-current voltage into a direct-current bus voltage. When the energy storage unit discharges to the direct-current bus, the partial power conversion circuit directly transmits to the direct-current bus a first part of the electrical energy provided by the energy storage unit, and converts a second part of the electrical energy provided by the energy storage unit and then transmits same to the direct-current bus. When the energy storage unit is charged by the direct-current bus, the partial power conversion circuit directly transmits to the energy storage unit a first part of the electrical energy provided by the direct-current bus, and converts a second part of the electrical energy provided by the direct-current bus and then transmits same to the energy storage unit. In this way, the direct-current bus voltage is kept stable. (FIG. 3A)

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