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Open AccessArticle

A Transformerless Medium Voltage Multiphase Motor Drive System

School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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
Energies 2016, 9(5), 323;
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)
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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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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