Picture of smart phone in human hand

World leading smartphone and mobile technology research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by Strathclyde researchers from the Department of Computer & Information Sciences involved in researching exciting new applications for mobile and smartphone technology. But the transformative application of mobile technologies is also the focus of research within disciplines as diverse as Electronic & Electrical Engineering, Marketing, Human Resource Management and Biomedical Enginering, among others.

Explore Strathclyde's Open Access research on smartphone technology now...

A hybrid modular multilevel converter for medium-voltage variable-speed motor drives

Li, Binbin and Zhou, Shaoze and Xu, Dianguo and Finney, Stephen J. and Williams, Barry W. (2017) A hybrid modular multilevel converter for medium-voltage variable-speed motor drives. IEEE Transactions on Power Electronics, 32 (6). 4619 - 4630. ISSN 0885-8993

[img]
Preview
Text (Li-etal-TPE-2017-A-hybrid-modular-multilevel-converter)
Li_etal_TPE_2017_A_hybrid_modular_multilevel_converter.pdf - Accepted Author Manuscript

Download (2MB) | Preview

Abstract

Modular multilevel converters (MMC) have revolutionized the voltage-sourced converter-based high-voltage direct current transmission, but not yet got widespread application in medium-voltage variable-speed motor drives, because of the large capacitor voltage ripples at low motor speeds. In this paper, a novel hybrid MMC topology is introduced, which significantly reduces the voltage ripple of capacitors, particularly at low motor speeds. Moreover, this topology does not introduce any motor common-mode voltage; as a result, there are no insulation and bearing current problems. Additionally, the current stress can remain at rated value throughout the whole speed range; thus, no device needs to be oversized and converter efficiency can be ensured. Operating principle of this hybrid topology is explained, and control schemes are also developed. Validity and performance of the proposed topology are verified by simulation and experimental results.