Virtual Inertia Estimation Method of DFIG-based Wind Farm with Additional Frequency Control

With the increasing penetration of wind power, using turbines to participate in frequency regulation support power system has become a clear consensus. To accurately quantify inertia provided by doubly-fed induction generator (DFIG) based farm, response model DFIG with additional control is established, and then Routh approximation, explicit expression virtual moment derived for grid-connected system. further enhance availability expression, an estimation method proposed on matrix pencil least squares algorithm estimating farm. Finally, numerical results tested modified IEEE 30-bus verify method.