In order to reduce the influence of physical parameter perturbation and load disturbance on stability control

improve the power quality of voltage PWM rectifier and reduce the harmonic content of input current

a kind of weak chattering Super-Twisting（WST）method is proposed by way of introducing the hyperbolic tangent function in the traditional Super-Twisting（ST）algorithm. By constructing a nonlinear robust control simulation model of the voltage-type PWM rectifier

the traditional ST and WST algorithms are compared and analyzed at the condition of sudden load change and large-scale perturbation of physical parameters. The simulation results show that the WST algorithm can significantly shorten the voltage stabilization time and effectively reduce the harmonic content of the AC input current under the perturbation of physical parameters. It has obvious effect on reducing the ripple of rectified voltage and has a good robustness on improving the load-shock resistance and model uncertainty of voltage PWM rectifier.