Coupling type vertical axis wind turbine and power generation method thereof

The invention discloses a coupling type vertical axis wind turbine and a power generation method thereof. A traditional lift type wind turbine cannot be self-started at a low wind speed. A pure drag type wind turbine is not high in power generation efficiency. According to the coupling type vertical axis wind turbine, a first sleeve and a second sleeve are both connected with a vertical shaft through bearings; the vertical shaft, the first sleeve and the second sleeve are in transition fit with the bearings; four blade grid assemblies are uniformly distributed in the circumferential directionof the vertical shaft; and in each blade grid assembly, the inner ends of two arc-shaped rod pieces are correspondingly fixed to the first sleeve and the second sleeve, the outer ends of the two arc-shaped rod pieces are correspondingly fixed to a corresponding airfoil blade, the two ends of grid plates are correspondingly hinged to the two arc-shaped rod pieces through first metal pins, one endsof the n grid plates are c