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Energies 2016, 9(5), 323; doi:10.3390/en9050323

A Transformerless Medium Voltage Multiphase Motor Drive System

1
School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
Dongfang Electric Corporation, New & Hi-tech Industry Western Zone, Xixin Avenue No. 18, Chengdu 611731, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jihong Wang
Received: 31 January 2016 / Revised: 14 April 2016 / Accepted: 18 April 2016 / Published: 27 April 2016
(This article belongs to the Special Issue Energy Efficient Actuators and Systems)
View Full-Text   |   Download PDF [5119 KB, uploaded 27 April 2016]   |  

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. View Full-Text
Keywords: cascaded H-bridge converter; motor drive; multiphase motor; PD-PWM; transformerless cascaded H-bridge converter; motor drive; multiphase motor; PD-PWM; transformerless
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, D.; Yang, J.; Chen, Z.; Mao, C.; Lu, J. A Transformerless Medium Voltage Multiphase Motor Drive System. Energies 2016, 9, 323.

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