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1

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

2

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





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

Fuente: http://mdpi.com/



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