基于随机开关脉冲定位的六相交流传动谐波频谱扩展SVM技术

This article introduces novel Random Switching pulse positioning based Space Vector Modulation (RS-SVM) techniques designed for Six-Phase Asymmetrical Induction Motor (6ΦAIM) drive. To spread the harmonic spectrum across the modulation frequency, this method uses random switching of the inverter’s switches, effectively reducing noise and harmonic distortion in the stator current. To improve harmonic distribution, RS-SVM techniques employ phase-specific switching count variations without increasing the overall switching frequency or altering the carrier period. Initially, two conventional Space Vector Modulation (SVM) techniques (RSVM1 and RSVM2) were analysed. Subsequently, four novel switching sequences (RS-SVM1, RS-SVM2, RS-SVM3, and RS-SVM4) were developed to reduce stator current harmonics and spread harmonic components around the modulation frequency more effectively than the reference SVM techniques. Both simulation and experimental results, obtained from a prototype 6ΦAIM powered by Dual Three-phase Voltage Source Inverters (DTVSIs), are presented to assess the effectiveness of each technique.