压缩机用永磁同步电机转速脉动抑制方法

The Method of Compressor PMSM Speed Ripple Reduction

为改善永磁同步电机(PMSM)驱动压缩制冷系统在低速运行时的转速特性,提出一种基于滑模观测器的控制策略。当压缩机处于变工况运行时,为减小负载转矩突变对PMSM控制系统的影响,提高系统抗扰动性能,使用滑模观测器对负载转矩进行观测,并将观测的转矩进行前馈补偿,以克服转矩瞬态变化对转速控制特性的影响。通过仿真和实验验证了所提控制方案的有效性和可行性。

In order to improve the speed characteristics of the permanent magnet synchronous motor（PMSM） drive at low speed compression refrigeration system,this paper proposes a control strategy based on sliding mode observer. When the compressor is running in variable conditions, in order to reduce the effect of the mutation load torque, and improve the system disturbance rejection perforrnanee ,using sliding mode observer to observe the load torque and feedforward compensation, to reduce the impact on the speed control characteristics.The simulation and experimental results are given to validate the method.