异步电机基于MRAC的转子时间常数在线辨识算法的统一描述

应用于异步电机转子时间常数在线辨识的模型参考自适应控制器(MRAC),依据其参考模型设计的不同,有着不同的算法形式。在深入分析转子时间常数T_r偏差对电机间接磁场定向、输出电磁转矩、无功功率影响的基础上,运用李雅普诺夫稳定理论提出了T_r在线辨识的统一MRAC自适应律,通过自适应律中参数的不同配置,可以得到多种基于MRAC的T_r在线辨识算法。借助于统一自适应律理论,为多种辨识模型间的演化和对比提供了理论依据。同时,该文所提自适应律的统一描述也有助于基于MRAC的T_r辨识理论体系的完善,使得辨识模型的选择有章可循。仿真和实验结果验证了该文分析的有效性。

Unified Description of MRAC-Based Online Rotor Time Constant Identification Algorithm for Induction Motors

Depending on the different design of the reference model,various kinds of Model Reference Adaptive Controller (MRAC)-Based online rotor time constant estimation algorithms have been proposed.The effect of detuned Tr on the flux orientation,electromagnetic torque and reactive power was presented in detail.Then a unified MRAC-based adaptive scheme for online Tr estimation was derived through Lyapunov theorem,which means different MRAC can be obtained with different configuration parameters in the unified scheme.The unified adaptive scheme supplies the theoretical basis for further study of the Tr updating model.Meanwhile,the unified scheme helps improve the system of the algorithms for Tr estimation based on MRAC,providing guideline for the selection of the estimation model.Simulation and experimental results have confirmed the validity of the proposed analysis.