Comparison of two modulation strategies for a three level inverter synchronous reluctance motor (SynRM) drive

2014 IEEE Industry Application Society Annual Meeting Pub Date : 2014-12-08 DOI:10.1109/IAS.2014.6978392

L. Masisi, P. Pillay, S. Williamson

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Abstract

In this paper, two modulation strategies for a three level neutral point clamped inverter SynRM drive are compared. The inverter uses two different algorithms called Mod-1 and Mod-2 for balancing the two dc bus capacitor voltages (suppression of the neutral point voltage). These modulation strategies are of the nearest three vector (NTV) family. Mod-1 chooses certain vector states to suppress the neutral point (NP) voltage ripple, whereas Mod-2 makes use of the inverter vector state's dwell time. The parameters of interest are the torque ripple, the neutral point voltage ripple and the inverter efficiency. The inverter was operated at a switching frequency of 10 kHz. The SynRM core losses were independent of the two modulation strategies, though lower torque ripples and better power quality were registered on Mod-2 strategy. Mod-1 strategy had 18% higher inverter efficiency during transient operation. Mod-2 strategy had 11% more NP voltage ripple during transient operation. The Mod-1 strategy supressed the NP voltage ripple throughout the machine's operation.

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三电平逆变同步磁阻电机(SynRM)驱动两种调制策略的比较

本文比较了三电平中性点箝位逆变器SynRM驱动的两种调制策略。逆变器使用两种不同的算法，称为Mod-1和Mod-2来平衡两个直流母线电容电压(抑制中性点电压)。这些调制策略是最近三矢量(NTV)族。Mod-1选择一定的矢量状态抑制中性点(NP)电压纹波，而Mod-2利用逆变器矢量状态的停留时间。感兴趣的参数是转矩纹波、中性点电压纹波和逆变器效率。逆变器以10千赫的开关频率工作。SynRM磁芯损耗与两种调制策略无关，但Mod-2策略记录了更低的转矩波动和更好的电能质量。Mod-1策略在瞬态运行时逆变器效率提高18%。Mod-2策略在瞬态运行时的NP电压纹波增加11%。Mod-1策略在整个机器运行过程中抑制了NP电压纹波。

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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2014 IEEE Industry Application Society Annual Meeting

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