Super-twisting resonant controller-based inverter nonlinearity compensation for permanent magnet synchronous motor drive system

In this paper, a novel super-twisting resonant controller with a fixed-time adaptive law (FTAL-STRC) is proposed to improve robustness and current smoothness of permanent magnet synchronous motor (PMSM). Firstly, the STRC controller is proposed, which incorporates the benefits of both the super-twisting controller (STC) and the quasi-resonant controller (QRC). Compared to the universal proportional integral resonant (PIR) control method, the proposed STRC can decrease the influence of inverter nonlinearity, and improve the robustness to parameters change, simultaneously. Secondly, an adaptive law based on fixed-time convergence theory (FTAL) is proposed to further compensate for the unknown disturbance, and realize fast tracking. Then, the composite control strategy is developed. Meanwhile, the stability of the proposed FTAL-STRC is proved rigorously. Finally, simulations and experiments are conducted to validate the effectiveness of the proposed method.