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A Transformerless Medium Voltage Multiphase Motor Drive System

Author

Listed:
  • Dan Wang

    (School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Jiawei Yang

    (Dongfang Electric Corporation, New & Hi-tech Industry Western Zone, Xixin Avenue No. 18, Chengdu 611731, China)

  • Zhu Chen

    (School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Chengxiong Mao

    (School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Jiming Lu

    (School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

A multiphase motor has several major advantages, such as high reliability, fault tolerance, and high power density. It is a critical issue to develop a reliable and efficient multiphase motor drive system. In this paper, a transformerless voltage source converter-based drive system for a medium-voltage (MV) multiphase motor is proposed. This drive converter employs cascaded H-bridge rectifiers loaded by H-bridge inverters as the interface between the grid and multiphase motor. The cascaded H-bridge rectifier technique makes the drive system able to be directly connected to the MV grid without the phase-shifting transformer because it can offset the voltage level gap between the MV grid and the semiconductor devices, provide near-sinusoidal AC terminal voltages without filters, and draw sinusoidal line current from the grid. Based on a digital signal processor (DSP), a complete improved Phase Disposition Pulse Width Modulation (PD-PWM) method is developed to ensure the individual DC-link capacitor voltage balancing for enhancing the controllability and limiting the voltage and power stress on the H-bridge cells. A downscaled prototype is designed and developed based on a nine-phase motor. The experimental results verify the excellent performances of the proposed drive system and control strategy in steady-state and variant-frequency startup operations.

Suggested Citation

  • Dan Wang & Jiawei Yang & Zhu Chen & Chengxiong Mao & Jiming Lu, 2016. "A Transformerless Medium Voltage Multiphase Motor Drive System," Energies, MDPI, vol. 9(5), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:5:p:323-:d:69008
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    Citations

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    Cited by:

    1. Jingyuan Yin & Wen Wu & Tongzhen Wei & Xuezhi Wu & Qunhai Huo, 2018. "A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults Based on Phase Disposition PWM," Energies, MDPI, vol. 12(1), pages 1-17, December.
    2. Jia Zou & Cong Wang & Hong Cheng & Jinqi Liu, 2018. "Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive," Energies, MDPI, vol. 11(5), pages 1-16, April.

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