Abstract: In this paper, a novel damping controlling schemein subsynchronous resonance（SSR） mitigation by model currents injection was proposed, including the torque maximization scheme and the damping maximization scheme.Through Park inverse transformation, the sub-synchronous and sup-synchronous components in the statorcorresponding to shaft speed deviation were derived. In synchronous frame, the distribution characteristics of both the sub-synchronous and the sup-synchronous currents were analyzed. On this basis, the torque maximization controlling scheme was proposed, which maximize the electromagnetic torque generated by injected currents. Then, the damping maximization controlling scheme was proposed. Finally, the proposed controlling scheme is demonstrated by digital simulation.