High Performance Direct Torque Controlled Induction Motor Drive for Adjustable Speed Drive Applications

B. Babu, C. Poongothai
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引用次数: 8

Abstract

Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque control in steady state and transient operating conditions to be obtained. This paper is aimed to analyze DTC principles, the strategies and the problems related to its implementation and the possible improvements using Space Vector Pulse Width Modulation (SVPWM). In SVPWM for each sampling period the switching instants of different space vectors are determined to reduce torque ripple. The time durations of two adjacent voltage space vectors and the corresponding zerovoltage space vectors are determined in this method depending on maximum and average switching frequency, allowable for the switching devices in the three phase inverter. Simulation studies have been carried out for different operating conditions of the drive system. The results have been presented and compared with those of the conventional method.
高性能直接转矩控制感应电机驱动可调速度驱动应用
在感应电机驱动的所有控制方法中,直接转矩控制(DTC)似乎特别有趣,因为它独立于机器转子参数,不需要速度或位置传感器。该方案的特点是不需要PI调节器、坐标变换、电流调节器和PWM信号发生器。尽管简单,但直接转矩控制可以在稳态和瞬态工况下获得良好的转矩控制。本文分析了空间矢量脉宽调制(SVPWM)实现DTC的原理、策略和相关问题,以及可能的改进方法。在SVPWM中,每个采样周期确定不同空间矢量的切换瞬间以减小转矩脉动。该方法根据三相逆变器中开关器件允许的最大开关频率和平均开关频率确定相邻两个电压空间矢量和相应的零电压空间矢量的持续时间。对不同工况下的驱动系统进行了仿真研究。给出了计算结果,并与常规方法进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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