基于降阶负载扰动观测器的永磁同步电机控制

针对永磁同步电动机(PMSM)的负载扰动问题,提出了一种基于降阶负载扰动观测器的永磁同步电机前馈控制方法。通过设计降阶负载观测器来实时观测电机负载转矩变化,并将观测值作为电流前馈补偿来增加系统鲁棒性;考虑到转动惯量对观测器的影响,引入了梯度校正参数估计法,对电机的转动惯量进行了实时辨识;最后,将负载转矩观测与永磁同步电机的矢量控制相结合,对永磁同步电机的q轴分量进行了转矩前馈补偿以提升系统的动态性能。仿真结果表明,采用梯度校正参数估算法能快速准确地迭代计算永磁同步电机的转动惯量,所设计的降阶负载扰动观测器能有效地估计转矩变化。研究结果表明,基于降阶负载转矩观测器的前馈补偿与永磁同步电机矢量控制相结合,能有效地提升永磁同步电动机转速控制的鲁棒性。

Control of PMSM based on reduced-order disturbance observer

Aiming at reducing effect of load torque disturbance to the motor speed,a novel control method for permanent magnetic synchronous motor（PMSM） with reduced order anti-disturbance observer was proposed.Reduced order anti-disturbance observer was designed to estimate the disturbance torque.The observed value was used as feed forward compensation to the current loop to improve the robustness of the system.Considering of the effect of the motor inertia parameter to the anti-disturbance observer,gradient correction parameter algorithm was introduced to estimate the inertia.Then,the estimation of the torque observer was compensated to the q-axis current to improve the dynamic response of the speed.The accuracy of the inertia estimation and the rationality of the reduced order anti-disturbance observer design were verified by the simulation result.The results indicate that the robustness of the system can be improved by vector control with the compensation of the estimation of the reduced-order disturbance observer.