基于改进模型预测转矩控制的高精度PMSM控制方法研究

High precision PMSM control method based on improved model predictive torque control

摘要:

为了准确预测电机的未来状态,提前采取控制措施,从而实现更精确和高效的电机控制,研究提出了基于双滑模观测器的高精度永磁同步电机预测转矩控制策略。反电动势滑模观测器中的滤波器以锁相环计算的位置信号为参考,自适应调节带通截止频率,滤除反电动势中的抖振和谐波,同步输出基波反电动势??。依据定子电流误差方程和转子磁链误差方程,建立磁链滑模观测器。最后,将两种滑模观测器组合而成双滑模观测器。结果表明,当转子系统达到稳态时,模型参考自适应系统观测器的控制误差仍有较大的变化,且在±0.4 rad范围内；而研究所提出的双滑模观测器,其转子系统的稳态时间较短,控制误差在±0.04 rad范围内,并且几乎没有抖动。研究所设计的双滑模变结构观测器,其速度估算值与真实速度曲线几乎一致,误差较小,即使在加减速状态下,也有较高的估计精度。该方法有效地降低了预测转矩脉动和预测磁链波动,提高了永磁同步电机的性能和稳定性。

Abstract:

To accurately predict the future state of the motor, take control measures in advance, and achieve more precise and efficient motor control, a high-precision permanent magnet synchronous motor predictive torque control strategy based on dual sliding mode observer is proposed. The filter in the anti electromotive force sliding mode observer takes the position signal calculated by the phase-locked loop as a reference, adaptively adjusts the bandpass cut-off frequency, filters out chattering and harmonics in the anti electromotive force, and synchronously outputs the fundamental anti electromotive force. Establish a magnetic flux sliding mode observer based on the stator current error equation and rotor magnetic flux error equation. Finally, combine the two sliding mode observers into a dual sliding mode observer. The results show that when the rotor system reaches steady state, the control error of the model reference adaptive system observer still varies greatly, and is within ±0.4 Within the range of rad; The dual sliding mode observer proposed by the research institute has a shorter steady-state time of the rotor system, a positioning error within ±0.04 rad range, and almost no jitter. The dual sliding mode variable structure observer designed by the research institute has a speed estimation value that is almost consistent with the true speed curve, with small errors and high estimation accuracy even in acceleration and deceleration states. This method effectively reduces the predicted torque ripple and predicted magnetic flux fluctuation, improving the performance and stability of permanent magnet synchronous motors.