异步牵引电机起动峰值电流抑制控制策略研究

异步牵引电机起动峰值电流抑制控制策略研究
摘 要： 针对DTC模式下异步牵引电动机起动峰值电流过大的问题，提出了一种抑制异步牵引电机起动峰值电流的转矩和磁链分时控制策略。根据两相静止 坐标系下异步电机的数学模型，利用Matlab/Simulink软件包中的S函数模块和基本模块，构建出直接转矩控制系统的仿真模型，对交流异步电动机在不同控制策略下的起动过程进行了动态仿真。仿真结果与目前牵引电机运行的数据接近，证明了该仿真模型的合理性和有效性；同时，仿真结果表明转矩和磁链分时控制策略至少可以降低2/3的起动峰值电流。
关键词：异步电动机；起动峰值电流；直接转矩控制；Matlab

Research on Control Strategy for Suppression of Asynchronous Traction Motor Starting Peak Current

Abstract：For the problem of asynchronous traction motor starting peak over-current in the DTC system, this paper proposes torque and flux linkage time-shared control strategy for suppression of asynchronous traction motor starting peak current. According to dynamic mathematical model on αβ coordinate system of asynchronous motor，the simulation model of the DTC system is established by using S-Function and standard modules in Matlab/Simulink software package. The research on the simulation of start-up proceeding of AC asynchronous motor is carried out with the use of the model under different control strategies. Simulation results and the motor operation data at present are close, which testifies the accuracy and the effectiveness of the simulation model; At the same time, the simulation results indicate that torque and flux linkage time-shared control strategy can reduce two thirds starting peak current.
Key words：Asynchronous motor; Starting peak current; Direct torque control; Matlab