Taheri A
Faculty of Engineering, Department of Electrical Engineering, University of Zanjan, Zanjan, Iran.
ISA Trans. 2016 Jul;63:299-314. doi: 10.1016/j.isatra.2016.02.014. Epub 2016 Mar 24.
In this paper, a new switching method in Direct Torque Control (DTC) of a six-phase induction machine for reduction of current harmonics is introduced. Selecting a suitable vector in each sampling period is an ordinal method in the ST-DTC drive of a six-phase induction machine. The six-phase induction machine has 64 voltage vectors and divided further into four groups. In the proposed DTC method, the suitable voltage vectors are selected from two vector groups. By a suitable selection of two vectors in each sampling period, the harmonic amplitude is decreased more, in and various comparison to that of the ST-DTC drive. The harmonics loss is greater reduced, while the electromechanical energy is decreased with switching loss showing a little increase. Spectrum analysis of the phase current in the standard and new switching table DTC of the six-phase induction machine and determination for the amplitude of each harmonics is proposed in this paper. The proposed method has a less sampling time in comparison to the ordinary method. The Harmonic analyses of the current in the low and high speed shows the performance of the presented method. The simplicity of the proposed method and its implementation without any extra hardware is other advantages of the proposed method. The simulation and experimental results show the preference of the proposed method.
本文介绍了一种用于降低电流谐波的六相感应电机直接转矩控制（DTC）中的新型开关方法。在六相感应电机的空间矢量直接转矩控制（ST-DTC）驱动中，在每个采样周期选择合适的矢量是一种常用方法。六相感应电机有64个电压矢量，并进一步分为四组。在所提出的DTC方法中，合适的电压矢量从两个矢量组中选择。通过在每个采样周期合适地选择两个矢量，与ST-DTC驱动相比，谐波幅值能更大程度地降低。谐波损耗大幅降低，而机电能量有所减少，开关损耗略有增加。本文提出了六相感应电机在标准和新开关表DTC中的相电流频谱分析以及各次谐波幅值的确定方法。与普通方法相比，所提方法具有更短的采样时间。对低速和高速时电流的谐波分析表明了所提方法的性能。所提方法的简单性及其无需任何额外硬件即可实现是该方法的其他优点。仿真和实验结果表明了所提方法的优越性。
