刮板输送机变频驱动控制策略研究

Control Strategy of Variable Frequency Drive for Scraper Conveyer

针对传统直接转矩控制系统的不足,提出了一种基于空间矢量脉宽调制(Space Vector Pulse Width Modulation,SVPWM)的直接转矩控制方法,并将其应用在刮板输送机变频驱动中.研究了刮板输送机传动系统的构成和负载特性,对直接转矩控制技术的基础理论进行了分析,对其低转速转矩脉冲大的原因进行了详细的研究,构建了基于SVPWM的直接转矩控制系统模型,利用Simulink对此模型进行了仿真.仿真结果表明,采用SVPWM技术能够弥补直接转矩控制系统下低速转矩脉冲大的缺陷.

To solve the problems in traditional direct torque control system, a direct torque control method based on Space Vector Pulse Width Modulation（SVPWM） was proposed and was applied to variable frequency driver of the scraper conveyor. The structure and load characteristics of scraper conveyor driver system were studied. The basic theory of direct torque control was described. The reasons of its low speed torque pulse were studied in details. The model of direct torque control system based on SVPWM was built, and the model was simulated by Simulink. The simulation results showed that the SVPWM technology could make up the defects of low speed torque pulse in the direct torque control system.