基于简单占空比调节的异步电机直接转矩控制

A Direct Torque Control Strategy of Induction Motor Drives with Simple Duty Ratio Regulator

针对异步电机传统直接转矩控制(DTC)存在的转矩脉动大、开关频率不固定等问题,已经提出了一些通过优化有效电压矢量占空比来减小转矩脉动的方法。然而,这些方法不仅计算复杂而且对参数依赖性大。本文在比较三种经典占空比控制方法性能的基础上,提出一种简单有效的占空比确定方法。该方法能同时减小转矩和磁链脉动,并且尽可能保持了传统DTC结构简单和鲁棒性强的优点。仿真和实验结果验证了本文所提方法的有效性。

In order to solve the problems of high torque ripple and variable switching frequency in conventional direct torque controlled(DTC) induction motor drives, the existing literature have proposed some methods to reduce torque ripple by optimizing the duty ratio of the active vector. However, these methods are usually complicated and parameter dependent. After comparing three typical kinds of duty determination methods, this paper proposes a very simple but effective method to obtain the duty ratio. The proposed scheme is able to reduce the torque and flux ripples significantly while maintaining the simplicity and robustness of the conventional DTC at the most. Simulations and presented experimental results validate the effectiveness of the proposed schemes in this paper.