Accomplishing effective vehicle-to-grid benefits through wireless power interface requires accurate and quick control reaction. This paper proposes a new approach of active power flow control for a bidirectional inductive wireless power transfer system (BIWPTS) in electric vehicle (EV) ancillary services. The controller exists on the vehicle side to consider the EV's owner desire. It permits the owner to choose between three different modes of operation: abstain, charge and discharge. The proposed algorithm receives the reference power and predicts the phase pulse modulation parameters for both the primary and secondary inverters. The prediction is achieved based on an accurate mathematical model for BIWTPS. In addition, the misalignment impact on the controller performance is considered by adaptively assessing the wireless pads mutual inductance during the real-time operation. The proposed controller is implemented and tested by means of simulations and experiments for stationary and quasi-dynamic wireless power transfer situations. It shows accurate and fast performance compared to the conventional proportional integral technique.