Method for adjusting parameters of additional frequency controller of double-fed variable-speed wind turbine generator

The invention discloses a method for adjusting the parameters of an additional frequency controller of a double-fed variable-speed wind turbine generator so as to ensure the stable operating of the wind turbine generator and fully exert the function of the wind turbine generator of supporting the frequency of a system. The method comprises the following steps: (1) collecting a power grid data, calculating the characteristic parameters of the conventional generator of the power grid, including the total installed capacity, the moment of inertia, the primary frequency modulation capability and the total load, and simplifying the system into a two-generator system; (2) setting power disturbance quantity for the system in the form of increasing the load suddenly, working out the optimal values of the gains of the additional frequency controller through a large amount of simulation calculation, and forming a standby parameter library for the selection of the gain of the additional frequency controller, wherein the gains of the additional frequency controller correspond to the cut-in wind speed and the cut-out wind speed which are different from each other, and the power disturbance quantity is 5% of the total load of the system; and (3) rounding the measured wind speed downwards according to the gains of the additional frequency controller, which correspond to the integral cut-in wind speed and the integral cut-out wind speed, and searching the corresponding gain of the additional frequency controller in the standby parameter library to set the additional frequency controller.