LMS算法的自适应逆控制变频调速系统

Self adaptive inverse control variable frequency speed control system based on LMS algorithm

针对矢量控制变频调速系统参数鲁棒性差这一交流传动领域难题,提出基于自适应逆控制理论的感应电机变频调速新型控制结构用于增强系统参数鲁棒性;提出一种基于变论域的变步长LMS自适应滤波算法用于电机系统及其逆系统建模。研究结果表明,变论域变步长LMS算法克服了收敛速度、时变系统跟踪速度与收敛精度方面的矛盾;自适应逆控制的变频调速系统对感应电机参数摄动具有鲁棒性。

In view of at the open problem of poor parameter robustness for variable frequency speed control system in the field of AC driving, this paper introduces a novel variable frequency speed control structure of induction motor to enhance the robustness for the system parameters based on the theory of adaptive inverse control. The paper proposesa novel variable step size LMS adaptive filter algorithm based on variable region and the model and inverse model of the induction motor speed control system are built by the algorithm. The result shows that LMS algorithm could resolve the contradiction among convergent speed, trace speed of the time-varying system and convergent accuracy. The variable frequency speed control system based on adaptive inverse control is robust to the parameter varying of induction motor.