Under unbalanced grid voltage, the ride-through operation of wind power systems will lead to fluctuations on output power and obvious harmonic distortion in grid-connected current. For the problem of that the constant output power and good current quality can not be achieved simultaneously, a power/current coordinate control scheme based on the quantum particle swarm optimization(QPSO) algorithm is proposed. The regulation coefficients α and beta are introduced into the calculation of reference current, and the relationships between the amplitude of power fluctuations, the harmonic distortion rate of current and the regulation coefficients are deduced. In order to take the power and current into account, the optimization model of the regulation coefficients is established with the minimum fluctuations on output power as the control objective and the current harmonic distortion limit as the constraint condition. Under the condition of different types of voltage unbalance faults, the coordinate control of power and current is realized using Matlab, which verifies the feasibility and effectiveness of the proposed control scheme.