一种改进的感应电机离散化模型

摘要

研究了一种基于不同坐标系下的离散化模型.根据电机静止坐标系下的定子方程与转子坐标系下的转子方程,以定子磁链和转子磁链为状态变量,设计离散化矩阵实现磁链信息的估计.混合离散模型的稳定性可由离散域稳定性定理保证,离散模型的极点轨迹存在于稳定区域内,实现了全速度区域内的模型稳定.最后通过系统仿真,验证了离散模型的正确性.%Aiming at the limitations of the discrete model of the induction motor using first-order Euler with full speed range,the model was unstable in high speed regional,an model based on different reference frame was studied.The model was based on the rotor equation in the rotor reference frame and the stator equation in the stationary reference frame,and use the stator flux and the rotor flux as the state variable to design the discrete matrix to realize the estimation of flux.The stability of the hybird discrete model can be proved by the stability theory of discrete domain.The root locus plot of the discrete model was in the stable region to achieve stability within the whole-speed range.The model was verified by MATLAB.