基于PR控制器的双三相永磁同步电机的矢量控制系统

Vector Control System of Dual Three-Phase Permanent Magnet Synchronous Motor Based on PR Controller

目前对于双三相永磁同步电机,传统的电流矢量控制策略大都采用同步旋转坐标系下d-q分量进行前馈解耦PI控制。这种传统的矢量控制技术不但需要复杂的旋转坐标变换计算,而且电机在运行中,电机的电感、电阻、等电机参数会随着磁路的饱和、温度的升高而发生改变,从而使交叉耦合项不准确,导致控制精度下降。本文提出一种基于比例谐振控制的静止坐标系下的电流矢量控制策略,其控制效果与同步坐标系下的PI控制器相同,可以无稳态误差地跟踪特定额定频率的正弦信号,对指定频率的谐波进行有选择的补偿。相对于传统的PI控制方法,基于PR控制器的在静止坐标系下的矢量控制系统不含与电机参数有关的前馈补偿项和解耦项,减少了坐标变换,从而减小了控制算法的实现难度,提高了控制系统的鲁棒性。

At present,for the two-phase three-phase permanent magnet synchronous motor,the traditional current vector control strategy mostly adopts the d-q component in the synchronous rotating coordinate system for feedforward decoupling PI control.This traditional vector control technology not only requires complex rotational coordinate transformation calculation,but also the motor’s inductance,resistance,and other motor parameters change with the saturation of the magnetic circuit and the temperature rise during the operation of the motor,thus making the cross coupling terms are inaccurate,resulting in reduced control accuracy.In this paper,a current vector control strategy based on proportional resonance control in a stationary coordinate system is proposed.The control effect is the same as that of the PI controller in the synchronous coordinate system.It can track the sinusoidal signal of a specific rated frequency without a steady-state error.The harmonics are selectively compensated.Compared with the traditional PI control method,the vector control system based on the PR controller in the stationary coordinate system does not contain the feedforward compensation term and the decoupling term related to the motor parameters,which reduces the coordinate transformation and thus reduces the control algorithm.The difficulty of implementation increases the robustness of the control system.