A Transformerless Medium Voltage Multiphase Motor Drive System

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ID: 75141
2016
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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.
Reference Key
wang2016aenergies Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Dan Wang, Jiawei Yang, Zhu Chen, Chengxiong Mao, Jiming Lu
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Journal energies
Year 2016
DOI
DOI not found
URL
http://www.mdpi.com/1996-1073/9/5/323
Keywords
Engineering (General). Civil engineering (General) Technology Electrical engineering. Electronics. Nuclear engineering production of electric energy or power. powerplants. central stations

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