A Transformerless Medium Voltage Multiphase Motor Drive SystemReport as inadecuate

A Transformerless Medium Voltage Multiphase Motor Drive System - Download this document for free, or read online. Document in PDF available to download.


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


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


Author to whom correspondence should be addressed.

Academic Editor: Jihong Wang

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

Author: Dan Wang 1, Jiawei Yang 2, Zhu Chen 1, Chengxiong Mao 1,* and Jiming Lu 1

Source: http://mdpi.com/


Related documents