基于电流检测误差补偿的嵌入式永磁同步电动机无位置传感器控制实验平台设计

Design of a Sensorless Control Experimental Platform for Interior Permanent Magnet Synchronous Motor Based on Current Detection Error Compensation

对基于高频脉振电压注入法的无位置传感器控制策略而言,转速和转子位置的准确估计十分重要。在传统高频脉振电压注入法的基础上,针对电流检测误差问题,提出一种电流检测误差补偿方法。该方法在传统位置观测器的基础上,增加了参数自适应陷波器环节,通过实时参数修订,消除位置观测器中由电流检测误差引起的二次谐波,提高转速和转子位置估计的准确性。采用品质因数更高的二阶广义积分器提取高频电流,改善控制系统的动态性能。通过搭建实验平台验证了所提补偿方法的可行性。

It is important to accurately estimate speed and rotor position for the sensorless control strategy of interior permanent magnet synchronous motor in pulsating high-frequency voltage injection method.In order to solve the problem of inaccurate current signal detection,a current detection error compensation method is proposed in this paper.The method adds a parameter-adaptive notch filter section on the basis of the traditional position observer.Through real-time parameter revisions,it eliminates the second harmonic caused by current detection errors in the position observer,thereby enhancing the accuracy of speed and rotor position estimation.Additionally,a second-order generalized integrator with higher quality factor is employed to extract high-frequency response current,thereby improving the dynamic performance of the control system.Finally,an experimental platform is constructed to validate the feasibility of the proposed compensation method.