一种计及饱和特性的感应电机三相不平衡稳态计算模型
A three-phase unbalanced steady state calculation model of induction motor considering saturation characteristics

摘要 感应电机磁路饱和时的三相不平衡电磁暂态仿真，Simulink通常采用初始值为零的处理方法，其存在的问题是计算收敛速度比较慢.本文提出一种解决该问题的新方法，可以显著缩短感应电机电磁暂态仿真的时间.以感应电机qd模型为基础，采用拉氏变换推导感应电机的正/负序阻抗模型，该模型可计算任一频率分量的正/负序阻抗；基于多项式拟合提出感应电机的非线性饱和特性处理方法.在此基础上，建立计及饱和特性的感应电机三相不平衡稳态计算模型，将该模型的计算结果作为感应电机电磁暂态仿真的初始值.用Matlab/Simulink进行仿真，验证了所提出方法和模型的正确性和有效性.
Abstract：When simulating the three-phase unbalanced electromagnetic transient of magnetic saturation induction motor, Simulink usually adopts the processing method of initial values default is zero. The problem is that the calculation of convergence rate is relatively slow. This paper presents a new method to solve this problem, which can significantly shorten the time of electromagnetic transient simulation of induction motor. Based on the model of induction motor, the positive/negative sequence impedance q-d model of induction motor is first derived through Laplace transform. The model can calculate the positive/negative sequence impedance of any frequency component. Then, the nonlinearity of induction motor is proposed based on polynomial fitting. Based on this, a three-phase unbalance steady-state calculation model of induction motor with saturation characteristic is established. The calculation results of this model are used as initial values of electromagnetic transient simulation of induction motor. Finally, the simulation with Matlab/Simulink verifies the correctness and effectiveness of the proposed method and model.