Offshore semi-direct-drive wind power plant equivalence method, system and device

The invention discloses an offshore semi-direct-drive wind power plant equivalence method, system and device, and the method comprises the following steps of obtaining the wind resource data of an offshore wind power plant; dividing the wind speed in the wind resource data into a plurality of wind speed segments according to a preset step length so as to establish a wind speed database; performingfirst grouping on the wind turbine generators according to the pitch angle control action of the semi-direct-drive wind turbine generators to obtain a first group and a second group; according to thewind speed database, grouping the wind turbine generators in the first group and the second group for the second time; respectively calculating the equivalent parameters of each wind turbine generator group obtained by the second time of grouping; and establishing an offshore semi-direct-drive wind power plant equivalent model according to each wind turbine generator group and the equivalent parameters thereof. The model