When the grid voltage is unbalanced, the double closed-loop PI control strategy needs to control the positive and negative sequence components of the grid voltage separately. Its parameter setting is complicated and the stability performance is poor. To simplify the control structure under unbalanced condition and improve the overall control effect of the system, a power control strategy for Vienna rectifier grid voltage reconfiguration under grid unbalanced condition is proposed. Firstly, by using grid voltage reconfiguration control to deal with the unbalanced voltage of the grid in the αβ two-phase static coordinate system, the coordinate transformation is reduced and the separation of positive and negative sequence components is cancelled. Then, from the perspective of optimizing the complexity of tuning parameters, a mathematical model of predicted power based on instantaneous power theory is formulated, and the tuning of PI controller parameters is cancelled. Finally, the comparison and analysis are implemented by building the simulation model of the predictive power control based on the network voltage reconstruction and the PI double closed-loop control strategy in MATLAB/ Simulink. Compared with the traditional PI control strategy, the analysis shows that this control strategy reduces the total distortion rate of grid-side current by about 70% under grid unbalance, and about 40% under grid unbalance and load mutation. The feasibility of the control strategy is evaluated on the platform.