Virtual inertia control method for double-fed wind generating set

The invention discloses a virtual inertia control method for a double-fed wind generating set, which is used for improving transient stability of a power grid. The technical proposal is that: variable quantity of power grid frequency is real-time measured based on a trailing control strategy of the biggest power; a proportionality coefficient of a novel power trailing curve is calculated according to the variable quantity of the power grid frequency and the power trailing curve is switched, so that power output of a wind power generator set is quickly adjusted; and a break variable of the power grid frequency is relieved by the rotation speed of the double-fed wind generating set and the change of kinetic energy, so that the system inertia is supported. The virtual inertia control method real-time adjusts the power trailing curve according to the power grid frequency change and the current operating state based on the biggest power trailing control strategy, provides a dynamic power support to the power grid, and relieves the frequency discontinuity of the power grid by releasing or storing the kinetic energy of a rotator, so that the bad influence of reducing the system inertia is improved after a wind power farm is accessed to the power grid, and the transient stability of the power grid is improved.