Small grid-connected wind power generation system and control method thereof

The invention discloses a small grid-connected wind power generation system and a control method thereof. The system comprises a rectification converter, a bidirectional energy storage converter, a BOOST converter and a grid-connected inverter; the input end of the rectification converter is connected with the three-phase output end of a fan L, while the output end of the rectification output side is connected with the direct-current input end of the BOOST converter through a direct-current bus; the bidirectional energy storage converter is composed of a bidirectional energy storage DC-DC converter and an energy storage battery adopting a lithium battery, and the bidirectional port of one side of the bidirectional energy storage converter is connected with the output end of the rectification converter; the BOOST converter is a direct-current voltage conversion circuit, the input end of the BOOST converter is connected with the direct-current bus, and the output end of the BOOST converter is connected with the direct-current side input end of the grid-connected inverter; the grid-connected inverter is a single-phase bridge grid-connected inverter; and the altering-current side output end of the grid-connected inverter is connected with a grid. The system can effectively improve the output voltage level of the rectification converter and relieve the pressure of the later BOOST converter for improving the direct-current voltage, and is significant for realizing normal grid-connected power generation.