Method and system for determining rated wind speed of unit in wind power plant

The invention provides a method and a system for determining rated wind speed of a unit in a wind power plant. The method comprises the following steps: acquiring wind speed probability distribution of each fan point location in the wind power plant in a preset period and a wind speed feasible region of each fan point location in the wind power plant; respectively determining the wind speed corresponding to the maximum probability value in the wind speed probability distribution of each fan point location in the preset period; and according to the wind speed corresponding to the maximum probability value in the wind speed probability distribution of each fan point location in the preset period and the wind speed feasible region of each fan point location, determining the rated wind speed of the wind turbine generator set at each fan point location in the wind power plant. According to the technical scheme, the rated wind speeds of the units at the different point positions are calculated according to the wind