1. Key Laboratory of Detection Technology and Energy Saving Devices of Anhui Province,Anhui Polytechnic University, Wuhu 241000 在期刊界中查找 在百度中查找 在本站中查找
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摘要:
为了改善传统滑模观测器( sliding mode observer, SMO)存在高频抖振、相位延迟、低速段失效等问题,提出一种改进 SMO 控制策略。 该方法在低通滤波器之前引入一个放大因子,放大反电动势信号以便于提取估计;采用双曲正切函数替换符 号函数,减少系统的高频抖振与信号干扰;采用自适应滤波器来提高检测精度,减小相位延迟。 通过 MATLAB/ Simulink 仿真分 析比较了改进 SMO 和传统 SMO 两种策略,结果显示改进 SMO 相较于传统 SMO 相位延迟时间缩短了 97. 5%,并且能够显著减 少抖振现象,精准估计 20 r/ min 以下的电机转速,实现在全速段保持良好的估算性能,表明改进 SMO 策略具有更优的估算精度 和适应性能。
In order to improve the problems of high-frequency chattering, phase delay, and low-speed failure in traditional sliding mode observers (SMO), this paper proposes an improved SMO control strategy. This method introduces an amplification factor before the lowpass filter to amplify the back-EMF signal for easy extraction and estimation; adopts the hyperbolic tangent function as the sign function to reduce the high-frequency chattering and signal interference of the system; adopts an adaptive filter to improve detection Accuracy, reduce phase delay. Through MATLAB/ Simulink simulation analysis, the two strategies of improved SMO and traditional SMO are compared. The results show that the improved SMO reduces the phase delay time by 97. 5% compared with the traditional SMO, and it can significantly reduce chattering phenomenon, and accurately estimate the motor below the speed of 20 r/ min. , to achieve good estimation performance at full speed, indicating that the improved SMO strategy has better estimation accuracy and adaptability.
