The decoupled state-space equations of three-phase voltage-source YWM rectifier in synchronous rotating reference frame (d-q frame) is established first.The double-closed-loop control strategy is adopted,which means the inner current-loop tracks reference current and the outer voltage-loop keeps the output voltage constant.A simplified algorithm is proposed,which simplifies the determination of the sector for reference voltage vector and calculation of the duty ratio in different sectors and avoids the nonlinear operations and improves the calculation speed and accuracy.Finally,The whole system is simulated using the toolbox of Matlab/Simulink and realized in experiment.The results illustrate that three-phase YWM rectifier could achieve unity power factor,low harmonic and constant DC output.