【摘要】 针对直接转矩控制(Direct Torque Control,简称DTC)模式下异步牵引电动机启动峰值电流过大的问题,提出了一种抑制异步牵引电机启动峰值电流的转矩和磁链同步控制策略。根据两相静止αβ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,构建出交流异步电动机直接转矩控制系统的仿真模型,对其在转矩和磁链不同控制策略下的启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。这表明,采用转矩和磁链同步控制策略至少可以降低2/3的启动峰值电流。更多还原

【Abstract】 Since asynchronous traction motor starting peak current is too large in the direct torque control (DTC) system, this paper proposes torque and flux linkage synchronous control strategy for suppression of asynchronous traction motor starting peak current. According to the dynamic mathematical model of asynchronous motor in αβ stator reference frame, the simulation model of AC asynchronous motor DTC system is established by using S-function and primary modules in Matlab/Simulink software package. The dynamic simulation of start-up proceeding of AC asynchronous motor is carried out with the use of the model under different torque and flux linkage control strategies. Simulation results are close to the motor operation data collected at present, which testifies the accuracy and the effectiveness of the simulation model. The simulation results indicate that torque and flux linkage synchronous control strategy can reduce two thirds of the starting peak current.更多还原