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Multiphase optimal injection PWM with dual carrier frequency to reduce current THD

机译：具有双载频的多相最佳注入PWM，可降低电流THD

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摘要

Multiphase voltage source inverter drives have recently applied to various industrial applications for variable speed motor drives. Both space-vector pulse-width modulation (SVPWM) and discontinuous PWM (DPWM) are commonly used modulators. Under the three-phase setting, it is well known that SVPWM is preferred for small modulation indices, whereas DPWM is better for large modulation indices. However, little detailed discussions on multiphase setting are reported. Further, for phase number higher than 5, no explicit instructions on how to select between SVPWM and DPWM to reduce current total harmonics distortion (THD). This study developed a generalised method to select either SVPWM or DPWM under different reference amplitudes and angles. The method can be easily extended to general -phase settings. Firstly, a generalised expression of PWM harmonic flux which is proportional to current distortion is derived. Second, by selecting the modulator that corresponds to minimum rms harmonic flux for every carrier period, optimal injection pulse-width modulation (OIPWM) is constructed. The theoretical analyses indicate that the harmonics distortion of OIPWM is greatly improved comparing with conventional SVPWM. A five-phase inverter drive built for experiments verifies the correctness and effectiveness of the proposed OIPWM.
机译：多相电压源逆变器驱动器最近已应用于变速电动机驱动器的各种工业应用中。空间矢量脉宽调制（SVPWM）和不连续PWM（DPWM）都是常用的调制器。在三相设置下，众所周知，对于较小的调制指数，SVPWM是首选，而对于较大的调制指数，DPWM更好。然而，很少有关于多相设置的详细讨论的报道。此外，对于高于5的相数，没有明确的指令说明如何在SVPWM和DPWM之间进行选择以减小电流总谐波失真（THD）。这项研究开发了一种通用方法来选择不同参考幅度和角度下的SVPWM或DPWM。该方法可以轻松扩展到通用相位设置。首先，推导了与电流畸变成比例的PWM谐波通量的一般表达式。其次，通过选择与每个载波周期的最小均方根谐波通量相对应的调制器，可以构建最佳注入脉冲宽度调制（OIPWM）。理论分析表明，与传统的SVPWM相比，OIPWM的谐波失真得到了很大的改善。用于实验的五相逆变器驱动器验证了所提出的OIPWM的正确性和有效性。

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