改进的广义二阶积分器的高频脉振方波电压注入PMSM无传感器控制

High-frequency pulsating square wave voltage injection PMSM for sensorless control based on improved SOGI

针对传统高频脉振方波电压注入算法的永磁同步电机(PMSM)无传感器控制系统中,使用多个滤波器来提取电流环反馈电流与高频响应电流,从而获取转子位置信息造成的系统延迟以及估计误差较大的问题,提出一种基于广义二阶积分器的无传感器控制策略。首先,与其他利用广义二阶积分器自身特性只提取高频方波响应电流检测转子位置方法不同的是,所提方法先在电流环双环控制中用广义二阶积分器对反馈基频电流信号进行提取;其次,在此控制系统的基础上,转速环用广义二阶积分器对包含电机转子位置信息的高频响应电流信号进行提取,并重新对广义二阶积分器进行了设计,在其结构上加入了高阶巴特沃斯滤波器,提高了抗谐波的衰减能力,改善了其动态性能。最后,在Simulink搭建了仿真模型并进行验证。实验结果表明,该方法相比于传统方法具有更好的动态性能和抗干扰能力。

In the permanent magnet synchronous motor(PMSM)sensorless control system based on the traditional high frequency pulsating square wave voltage injection algorithm,multiple filters are used to extract the current loop feedback current and the high frequency response current,so as to obtain rotor position information,which can cause system delay and estimation error.On this basis,a sensorless control strategy based on second-order generalized integrator(SOGI)is proposed.Different from other methods that only extract high frequency square wave response current based on SOGI characteristics to detect rotor position,the proposed method can extract the feedback fundamental frequency current signal by means of SOGI in current-loop double-loop control.On the basis of this control system,SOGI is used at the rotor speed loop to extract the high-frequency response current signal containing the position information of the motor rotor,and SOGI is re-designed.The high-order Butterworth filter is added to its structure to improve the anti-harmonic attenuation ability and improve its dynamic performance.The simulation model is built in Simulink for verification.The experimental results demonstrate that,in comparison with traditional methods,this method has better dynamic performance and anti-interference ability.