基于状态观测器的异步电机定子磁链观测和速度辨识

Stator Flux Linkage and Speed Estimation of Induction Motor Based on Full-Order State Observer

提出一种基于全阶观测器的感应电机磁链估计方法,系统地给出了这种观测器的设计过程.仿真研究表明,该方案对电机参数变化的鲁棒性较好,磁链观测精度高.根据李雅普诺夫稳定性原理推导出基于自适应状态观测器的直接转矩控制系统速度辨识算法,其收敛速度快、精度高.基于状态观测器方案在准确观测电机磁链的同时,可实现高性能的无速度传感器运行.

A method for designing full-order state observer for induction motor is proposed, in which the state variables are stator current and stator flux linkage. The design method for the state observer is given systematically. Simulation results show that the observer has satisfactory estimation performance of stator flux. Based on the adaptive full-order observer, a speed estimation method is obtained based on the Liapunov stability theorem. With the proposed full-order observer, the flux linkage of motor can be accurately observed and high performance achieved without shaft encoder.