Method and device for determining blade tip speed ratio of wind turbine generator and main controller

The invention discloses a method and device for determining the blade tip speed ratio of a wind turbine generator and a main controller. The method for determining the blade tip speed ratio of the wind turbine generator comprises the steps that a target wind speed interval and M preset optimal gain coefficients Kopt are obtained, wherein M is a positive integer larger than 1; on the basis of the target wind speed interval and the M preset Kopts, obtaining respective corresponding internet surfing powers of the wind turbine generator in the target wind speed interval and under the M preset Kopts; determining the maximum internet surfing power in all the internet surfing powers; determining a preset Kopt corresponding to the maximum on-grid power as a target Kopt; and the target tip speed ratio of the wind turbine generator is determined according to the target Kopt. By means of the method for determining the blade tip speed ratio of the wind turbine generator, the target blade tip speed ratio determined accord