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提出一种同时实现感应电机转速和转子电流观测的方法。针对感应电机这一多变量耦合非线性时变对象 ,以 L yapunov稳定判据作为设计基础 ,通过变结构项的引入来抵消不可知部分 ,确保L yapunov稳定判据的条件成立 ,从而得到原系统的鲁棒非线性观测器。理论分析表明 ,由于变结构项的引入 ,保证了所设计的观测器具有收敛性和对参数变动的鲁棒性。感应电机的仿真实验说明了该方法的可行性和良好性能。
A new method to realize the induction motor speed and rotor current observation simultaneously is proposed. Aiming at the multivariable coupled nonlinear time-varying object of induction motor, the L yapunov stability criterion is taken as the design basis, and the unknown part is counteracted by the introduction of variable structure term to ensure that the conditions of L yapunov stability criterion are satisfied and the original system Robust Nonlinear Observer. Theoretical analysis shows that due to the introduction of variable structure, the designed observer has the characteristics of convergence and robustness to parameter variation. The simulation experiment of induction motor shows the feasibility and good performance of this method.