This paper proposes a new three-phase to five-phase transformer, with a 30-pulse AC–DC converter for power quality improvement in vector-controlled induction motor drive. Here, three isolated transformers (T1, T2, and T3) are used and each transformer is designed to convert three-phase AC-supply into five-phase AC supply, to achieve ten-pulse AC–DC conversion. A unique configuration and angle among these three transformers is designed in such a way that the resultant input current of this transformer shows 30 pulses in it. A hybrid multilevel inverter is proposed in this paper, which is cascading a three-level neutral point clamped inverter with a two-level voltage source inverter to drive an induction motor (IM). A modified level shifted carrier-based sinusoidal pulsewidth modulation and a 3rd harmonic injection techniques are utilized to modify the modulating signal, to enhance the fundamental magnitude, and to reduce the harmonics than traditional technique. The responses of proposed medium voltage induction motor drive (MVIMD) are evaluated by simulating in MATLAB-Simulink. The proposed MVIMD performance is then verified using a scaled down laboratory prototype under various operating conditions such as steady state, starting, load perturbation, speed control, field weakening, varying load conditions, and over a wide speed range of IM.

中文翻译：

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基于 VCIMD 的混合多电平逆变器中具有电能质量改进的新型三相到五相变压器

本文提出了一种新的三相到五相变压器，带有 30 脉冲 AC-DC 转换器，用于改善矢量控制感应电机驱动的电能质量。这里使用了三个隔离变压器（T1、T2 和 T3），每个变压器设计用于将三相交流电源转换为五相交流电源，以实现十脉冲 AC-DC 转换。这三个变压器之间独特的配置和角度的设计方式是，该变压器的合成输入电流在其中显示 30 个脉冲。本文提出了一种混合多电平逆变器，它将三电平中性点钳位逆变器与两电平电压源逆变器级联以驱动感应电机 (IM)。改进的基于电平偏移的载波正弦脉宽调制和三次谐波注入技术用于修改调制信号，以增强基波幅度，并比传统技术减少谐波。通过在 MATLAB-Simulink 中进行仿真来评估提议的中压感应电机驱动器 (MVIMD) 的响应。然后使用按比例缩小的实验室原型在各种操作条件下验证建议的 MVIMD 性能，例如稳态、启动、负载扰动、速度控制、弱磁、变化负载条件和宽的 IM 速度范围。通过在 MATLAB-Simulink 中进行仿真来评估提议的中压感应电机驱动器 (MVIMD) 的响应。然后使用按比例缩小的实验室原型在各种操作条件下验证建议的 MVIMD 性能，例如稳态、启动、负载扰动、速度控制、弱磁、变化负载条件和宽的 IM 速度范围。通过在 MATLAB-Simulink 中进行仿真来评估提议的中压感应电机驱动器 (MVIMD) 的响应。然后使用按比例缩小的实验室原型在各种操作条件下验证建议的 MVIMD 性能，例如稳态、启动、负载扰动、速度控制、弱磁、变化负载条件和宽的 IM 速度范围。