Deadbeat Predictive Current Control Using Super-Twisting Observer for SPMSM Drives With Anti-Disturbance Sliding Mode Speed Controller

Abstract

Deadbeat predictive current control (DPCC) has received widespread attention due to its fast dynamic response and good current tracking accuracy. However, DPCC suffers from internal disturbance, such as parameter mismatch, and external disturbance, such as external load change. Firstly, an anti-disturbance terminal sliding mode controller (ATSMC), consisting of a novel reaching law (NRL) based terminal sliding mode controller (TSMC) and an integral-type terminal sliding-mode observer (ITSMO) is developed to improve the performance of speed loop. ATSMC can accelerate the convergence velocity and suppress the chattering simultaneously. Furthermore, to promote the current tracking performance and anti-disturbance property of DPCC against various unknown disturbances, a super-twisting observer (STO) in discrete time is designed to eliminate the disturbance caused by parameter mismatch of conventional DPCC, and the estimated values are compensated for the voltage vector to enhance the robustness. Finally, experiments are implemented on a 1.7-kW surface-mounted permanent-magnet synchronous motor (SPMSM) experimental platform, and the results validate the superiority of the proposed method compared with conventional methods.