Torque Ripple Suppression of PMSM Based on Robust Two Degrees-of-Freedom Resonant Controller

Abstract

This paper concentrates on a robust resonant control strategy of a permanent magnet synchronous motor (PMSM) for electric drivers with model uncertainties and external disturbances to improve the control performance of the current loop. Firstly, to reduce the torque ripple of PMSM, the resonant controller with fractional order (FO) calculus is introduced. Then, a robust two degrees-of-freedom (Robust-TDOF) control strategy was designed based on the modified resonant controller. Finally, by combining the two control methods, this study proposes an enhanced Robust-TDOF regulation method, named as the robust two degrees-of-freedom resonant controller (Robust-TDOFR), to guarantee the robustness of model uncertainty and to further improve the performance with minimized periodic torque ripples. Meanwhile, a tuning method was constructed followed by stability and robust stability analysis. Furthermore, the proposed Robust-TDOFR control method was applied in the current loop of a PMSM to suppress the periodic current harmonics caused by non-ideal factors of inverter and current measurement errors. Finally, simulations and experiments were performed to validate our control strategy. The simulation and experimental results showed that the THDs (total harmonic distortion) of phase current decreased to a level of 0.69% and 5.79% in the two testing environments.

A Combined Fractional Order Repetitive Controller and Dynamic Gain Regulator for Speed Ripple Suppression in PMSM Drives

“…When using a fractional order model to describe an object with fractional order characteristics, it can better reveal the essential characteristics and behavior of the object. Correspondingly, for a fractional order model, a corresponding fractional order controller needs to be designed to improve the control effect [27,28]. In [27], a resonant controller with fractional order calculus is proposed to suppress the periodic current harmonics caused by non-ideal factors in the inverter and current measurement errors.…”

“…Correspondingly, for a fractional order model, a corresponding fractional order controller needs to be designed to improve the control effect [27,28]. In [27], a resonant controller with fractional order calculus is proposed to suppress the periodic current harmonics caused by non-ideal factors in the inverter and current measurement errors. Reference [28] applies fractional order PID to an automatic power generation control system and uses a Crow algorithm to optimize the controller parameters, which improves the dynamic performance and robustness of the system.…”