改进型自抗扰解耦的PMSM调速控制方法研究

Research on PMSM Speed Regulation Method of Improved Active Disturbance Rejection Decoupling

为了解决永磁同步电机耦合性问题及提高其高速运行时抗扰动的能力,提出一种改进型自抗扰解耦的控制方法。系统内环引入虚拟控制量实现电流环的自抗扰解耦控制。为了提高扰动观测器的观测精度,对电流环的扰动观测器进行改进,将总扰动分为两部分,观测器只用来估计未知部分扰动。速度环采用自抗扰控制器,可以对负载变化进行扰动补偿,提高系统抗扰动能力。仿真结果表明:与传统的PI前馈解耦控制相比,该方法能够改善电流解耦性能,提高系统的调速精度及抗干扰能力。

In order to solve the coupling problem of a permanent magnet synchronous motor(PMSM)and improve its anti-disturbance ability at high speed,an improved anti-disturbance decoupling technique is proposed in this paper.A virtual control variable is introduced into the current loop of the motor to realize the active disturbance decoupling control.In order to improve the observation accuracy of the disturbance observer,the disturbance observer of the current loop is improved by dividing the total disturbance into two parts,and the observer is only used to estimate the unknowndisturbances.The anti-disturbance controller is used in the speed loop,which can perform the disturbance compensation for load changes and improve the anti-disturbance ability.Simulation results show that the proposed control algorithm can improve the current decoupling performance,improve the speed regulation accuracy and anti-disturbance ability compared with the traditional proportional-integral(PI)feedforward decoupling control.