基于模糊逻辑的定子电阻辨识及仿真分析

摘要

针对感应电机定子电阻在电机运转过程中会发生非线性动态变化,进而影响矢量控制系统的动态性能和稳定性问题,为改善无速度传感器控制系统的调速性能,分析了基于MRAS的转子磁链和速度估算原理,提出了一种以转子磁链和定子电流矢量作为输入,以定子电阻的变化量作为输出,基于模糊逻辑的感应电机定子电阻在线辨识的方法；在仿真环境下对增加定子电阻辨识后的转速波形进行了对比,对定子电阻突变到原来值两倍时的辨识效果进行了仿真,实验结果表明这种方案结构简单,可靠性高,计算复杂度低,对定子电阻的变化具有明显的辨识能力,能显著改善控制系统的调速性能.%Induction motor stator resistance occur non-linear dynamics changes during the motor operation, thereby further affecting the dynamics performance and stability of vector control system. To improve the speed sensorless speed control system performance, analyzed the rotor flux and speed estimation principle based on MARS. On this basis, a induction motor stator resistance online identification new method based on fuzzy logic is proposed. This kind of fuzzy logic identification method with rotor flux and stator current vector as input, the stator resistance variation as the output. Experiments in Matlab / Simulink simulation environment show that the method has simple structure, high reliability, low computational complexity, obvious identification ability about the stator resistance Variation, can significantly improve the speed control system performance.