Double internal model control for permanent magnet synchronous motor vector control system

摘要

Recently, the internal model control (IMC) theory is widely applied to the permanent magnet synchronous motor (PMSM) vector control system. In this paper, a double internal model control (DIMC) is proposed. The DIMC contains an improved internal model decoupling control (IMDC) and a simplified two degree of freedom internal model control (2DOF-IMC). First, in current loop, the improved IMDC can address the issue that there is a trade-off between decoupling effect, response speed and steady state error during the selection of the sole adjustable parameter in the conventional IMDC. Second, in speed loop, the simplified 2DOF-IMC can make the performances on speed tracking and disturbance rejection be regulated independently, and can simplify the structure of the speed controller. According to the simulation results, the DIMC for PMSM vector control system shows good performances on current decoupling and high current control accuracy. The speed-regulating performance is promising.