This article proposes a three-level inverter topology for nine-phase pole phase-modulated induction motor (PPMIM) drives by using the two identical voltage profile coils (IVPC) of a four-pole stator winding. In general, the two IVPCs of each phase winding are connected in series, but in this article, these two IVPCs are separated and excited with conventional two-switch inverter legs without disturbing the flux per pole and other machine parameters. The 18 IVPCs of four-pole nine-phase induction motor (IM) are excited with 18 two-switch inverter legs and fed by the same dc source. Each two-switch inverter leg generates the two-level voltage across each IVPC winding, i.e., the resultant voltage seen by the phase winding is a three-level voltage waveform. As compared to conventional nine-phase neutral point and flying capacitor multilevel inverters (MLIs), the requirement of the dc-link magnitude for the proposed topology is reduced by 50%. The nine-phase PPMIM drive is modulated with the carrier-based three-phase space vector pulsewidth modulation in order to enhance the linear modulation range (LMR). The inverter legs associated with two IVPCs per phase in 9-phase 4-pole (9PH-4PO) mode and six IVPCs per phase in 3-phase 12-pole (3PH-12PO) mode are modulated with the same reference wave and phase-displaced triangular waves. This results in the generation of multilevel voltage with improved harmonic voltage profile, i.e., minimizes the torque pulsations of nine-phase PPMIM drive. The validation of the proposed MLI-fed 5 hp nine-phase PPMIM drive is carried out by using the Ansys Maxwell FEM tool as well as with an experimental prototype.

中文翻译：

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用于四极开放式绕组九相 PPMIM 驱动器的基于单直流源的三电平逆变器拓扑


本文提出了一种用于九相极调相感应电机 (PPMIM) 驱动器的三电平逆变器拓扑，该拓扑使用四极定子绕组的两个相同的电压分布线圈 (IVPC)。一般情况下，每相绕组的两个 IVPC 串联连接，但在本文中，这两个 IVPC 通过传统的双开关逆变器支路分离和励磁，而不会干扰每极磁通和其他机器参数。四极九相感应电机 (IM) 的 18 个 IVPC 由 18 个二开关逆变器支路励磁，并由同一直流电源供电。每个二开关逆变器桥臂在每个IVPC绕组上产生两电平电压，即相绕组看到的合成电压是三电平电压波形。与传统的九相中性点和飞跨电容器多电平逆变器（MLI）相比，所提出的拓扑对直流母线幅度的要求降低了50%。九相 PPMIM 驱动器采用基于载波的三相空间矢量脉宽调制进行调制，以增强线性调制范围 (LMR)。与 9 相 4 极 (9PH-4PO) 模式下每相 2 个 IVPC 和 3 相 12 极 (3PH-12PO) 模式下每相 6 个 IVPC 关联的逆变器支路使用相同的参考波和相位进行调制。位移三角波。这导致生成具有改进的谐波电压分布的多电平电压，即最小化九相PPMIM驱动器的扭矩脉动。使用 Ansys Maxwell FEM 工具以及实验原型对拟议的 MLI 馈电 5 马力九相 PPMIM 驱动器进行了验证。