PLL与ADRC在PMSM中的应用研究

Application Research of PLL and ADRC in PMSM

利用锁相环作为永磁同步电机的速度观测器,能够有效解决经位置差分法测量伺服电机转速时产生的相位滞后问题。将锁相环与自抗扰控制相结合,把锁相环观测到的速度信号作为转速环的反馈。采用线性自抗扰控制器设计永磁同步电机控制系统的转速环和电流环。将负载作为外部扰动,将d-q轴的耦合项和电源波动作为内部扰动,该方法能估计出总的扰动量然后加以补偿。仿真和实验结果表明该方案速度观测准确,系统的动态性能和抗扰动能力良好。

Phase-locked loop(PLL) was used as the speed observer of the permanent magnet synchronous motor (PMSM).It can effectively solve the problem of phase lag when the servo motor speed was measured by the position difference method.Meanwhile,the phase-locked loop was combined with the auto-disturbance-rejection control(ADRC),and the speed signal observed by the phase-locked loop was used as the feedback of the speed-loop.The linear auto-disturbance rejection controller was used to design the speed and current loops of the PMSM control system.The load was used as the external disturbance,and the coupling term of the d-q axis and the power fluctuation were used as the internal disturbance.This method can estimate the total disturbance and then compensate it.The results of simulation and experiments demonstrate that speed was estimated precisely,the dynamic performance was improved,and the capability of disturbance rejection was satisfied.