Robust Current Predicted Control of Permanent Magnet Synchronous Motors Based on Novel Sliding Model Observer

Abstract

In the permanent magnet synchronous motor (PMSM) speed control system, having a rapidly and steady current control internal loop is the sticking point to guaranteeing that the motor has good output torque performance. The deadbeat predictive current control (DPCC) strategy has rapidly current response, but it depends heavily on the precise mathematical model of the machine. When the motor parameter in the current loop controller has a mismatch with real system, the steady error of the output current of motor will appear, and even lead to system oscillations. Therefore, a robust predicted current control of PMSM based on novel sliding model observer is proposed in this article. First, the performance of the traditional DPCC when the machine mathematical model mismatch is analyzed, and then a sliding mode observer based on an exponential-based bi-power reaching law is proposed, which can predict stator current and estimate the current transient at same time. Compared with the traditional DPCC, the scheme of this paper can remove stator current static error caused by parameter mismatch. The validity and effectiveness of method are proved by experiment.