磁链对异步电机直接转矩控制系统影响的仿真研究

The Simulation Study on Flux Effect on Direct Torque Control System of Induction Motor

异步电动机直接转矩控制的普遍问题是转矩脉动大 ,而磁链脉动是其主要原因。在分析了传统方法磁链对异步电机转矩和转速影响的基础上 ,采用一种新的直接转矩控制方法 ,完成系统硬件和软件设计 ,在克服逆变器死区带来的磁链脉动的前提下 ,能够比较平滑的建立磁链 ,形成逼近的圆形磁链轨迹。文章对该系统进行建模 ,并与两点式磁链调节器和传统方法进行仿真比较 ,证实该系统具有更好的磁链调节性能 ,使转矩脉动减小。

Direct torque control for induction motor generally has a shortcoming of torque pulsation. Flux pulsation is a major cause. An improved control system is applied in this paper based on the analysis on flux effect in the case of traditional method. The hardware structure and software are designed better so that flux is built smoothly, the approximate circle flux trajectory is developed, and flux pulsation brought by dead time of inverter is overcome. The simulation model of the system is built in this paper. The system is verified to decrease flux pulsation and torque pulsation through comparison with two point flux regulator and traditional method.