基于非线性抗扰滑模控制的永磁同步电机直接转矩控制

Permanent Magnet Synchronous Motor Direct Torque Control Based on Nonlinear Disturbance Rejection Sliding Mode Control

针对永磁同步电机(PMSM)内部参数不确定和外部干扰未知的问题,提出了一种基于非线性光滑扩张状态观测器(ESO)的非线性控制方法。通过引入非线性光滑函数设计了ESO,实现了对PMSM内部和外部不确定因素的观测,并把观测结果实时补偿给非线性控制器,有效提高了电机的动静态性能和抗扰能力。采用基于非线性光滑函数的滑模控制器替代传统直接转矩控制中的滞环控制器,有效地削弱了转矩和磁链的抖振和脉动。仿真结果表明所提方法响应速度快、稳定性好、抗扰能力强,是一种鲁棒性强的控制方法。

In order to solve the problem of uncertain internal parameters and unknown external disturbances of permanent magnet synchronous motor (PMSM), a nonlinear control method based on nonlinear smooth extended state observer (ESO) was proposed. By introducing the non linear smooth function, the ESO was designed to observe the internal and external uncertainties of PMSM. The observational results were compensated to the non linear controller in real time, which improved the dynamic and static performance and anti-disturbance ability of the motor effectively. Sliding mode controller based on non linear smooth function was used to replace the hysteresis controller in traditional direct torque control (DTC), which effectively weakened the chattering and pulsation of the torque and flux linkage. The simulation results showed that the method has fast response, good stability, strong anti-disturbance ability, and good robustness.