Doubly-fed fan inertia evaluation method based on variable forgetting factor least square method

The method and the system relate to the technical field of power systems, and comprise the following steps: constructing a double-fed fan inertia mathematical model in a variable wind speed scene by using a double-fed fan as an interference model of a disturbance source in a variable wind speed scene in an MPPT mode; according to the discrete model of the inertia of the doubly-fed fan, constructing a least square form model of the inertia of the doubly-fed fan; and evaluating the maximum available inertia of the doubly-fed fan based on the variable forgetting factor. According to the doubly-fed fan inertia evaluation method based on the variable forgetting factor least square method, real-time online evaluation can be carried out on the virtual inertia of the doubly-fed fan according to the characteristic that the output of the doubly-fed fan is uncertain, the method can be used for measuring and calculating the inertia parameter of the doubly-fed fan, and meanwhile, the variable forgetting factor recursive l