A Transformerless Medium Voltage Multiphase Motor Drive System

Dan Wang, Jiawei Yang, Zhu Chen, Chengxiong Mao and Jiming Lu
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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

Energies, 2016, vol. 9, issue 5, 1-14

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.

Keywords: cascaded H-bridge converter; motor drive; multiphase motor; PD-PWM; transformerless (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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