Performance improvement for PMSM control system based on composite controller used adaptive internal model controller

Abstract

The dead-zone time is inevitable during the inverter working process, thus, the relationships between the input variables and the output variables of the permanent magnet synchronous motor (PMSM) control system exhibit nonlinearity characteristic. Additionally, the PMSM control system suffers from some drawbacks, such as high amount current harmonics and large torque ripples. In order to improve the operation performance for the PMSM control system, a composite controller for the current loop is proposed in this paper, which can enhance the current harmonics suppression ability. Firstly, the components of the current harmonics are analyzed. The parameters of the proportional controller are analyzed through three-dimensional image and two-dimensional image of frequency characteristics. In view of the real sampling number in the delay element maybe not an integer, an adaptive internal model controller is designed for the repetitive controller. Thus, a composite controller consist of a proportional controller and the improved repetitive controller is proposed in this paper. The parameters of the improved repetitive controller are also studied. Furthermore, the stability of the control system used the proposed composite controller is analyzed through Lyapunov theory. Finally, the PMSM control system model is established through Matlab/Simulink software, and the operation performances of the PMSM control system used different current loop controllers are studied. And the simulation results show that the proposed composite controller can suppress the current harmonics and the torque ripples effectively.

Keywords

• Permanent magnet synchronous motor
• Current harmonics
• Adaptive internal model controller
• Repetitive controller