When PMSM contains system uncertainties and external disturbances, conventional PI control cannot obtain better control performance, and traditional sliding mode control based on continuous-time second-order motion equations can easily induce noises due to the speed differential term. Thus, a minimum-order disturbance estimation based novel discrete proportional-integral sliding mode (DP-ISM) composite speed control scheme is presented. First, based on the first-order discrete PMSM model, a new DP-ISM surface and a robust discrete quasi-sliding mode controller are designed, which can eliminate the steady-state error and realize global robustness. Then, to further improve system anti-disturbance ability and suppress chattering, a minimum-order disturbance estimator is constructed, which combines with the DP-ISM controller to form two degrees of freedom. It has simple design and the minimum observer dimension. Finally, the stability of the composite controller is theoretically proved and a dSPACE-based experimental platform is built to verify the superiority of the presented algorism.
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2018, Vol. 33 
