应用特征谐波消除改进脉振高频电压注入法

Improved pulsating high-frequency voltage injection with characteristic harmonic elimination

针对永磁同步电机无位置传感器矢量控制中传统脉振高频电压注入法存在的估算角度滞后、与中高速无位置传感器控制技术切换困难等问题提出改进方法。引入特征谐波消除的方式取代低通滤波器,同时充分考虑定子电阻对位置估算的影响,修改误差矫正项以减小估算误差,并给出了改进后的脉振高频电压注入法的完整实现方式。应用特征谐波消除的方式得到误差校正项,估算的转子位置更加精确,用特征谐波消除的方式去除高频电流信号,不会引起电流畸变和相位滞后。用改进算法得到的转子位置及转速作为反馈对电机进行闭环控制,可以改善电机低速下的动态特性。仿真分析和实验结果证明了该方法的有效性。

The traditional pulsating high-frequency voltage injection （PHFVI） method has problems such as estimated rotor position lag and difficulty in switching to higher speed region. To solve these problems, the characteristic harmonic elimination （CHE） method is applied to replace the traditional low pass filter. Besides, taking the stator resistance into consideration, a modified estimation error correction term was proposed to reduce the elimination error. It resulted in more accurate estimated position, less current distortion and less phase lag. Using the estimated position and speed as feedbacks in speed regulation loop can improve low speed dynamic performance of the motor. The complete scheme of the proposed method was given. Simulation and experimental results are demonstrated in detail to verify the feasibility and advantages of the proposed scheme.