Abstract: Compared with conventional synchronous generators,wind turbines（WT）active power response and grid frequency are decoupled. WT do not have the ability of active frequency response. New challenges of gird frequency stability occur with high percentage of new energy access. Through virtual synchronous generator（VSG）technology transformation of WT,active frequency regulation ability is possessed. Field tests of reserve capacity and rotor inertia frequency regulation control method are conducted. The results show that WPVSG have ability of active power support. Active power jump when exiting frequency regulation and improper control coordination of electromagnetic torque and pitch angle engineering problems are closed loop optimized.