Analysis of Dead-time Harmonics in Single-phase Transformerless Full-bridge PV Inverters

Yang, Y., Zhou, K. and Blaabjerg, F. (2018) Analysis of Dead-time Harmonics in Single-phase Transformerless Full-bridge PV Inverters. In: 2018 IEEE Applied Power Electronics Conference and Exposition (APEC), San Antonio, TX, USA, 04-08 Mar 2018, pp. 1310-1315. ISBN 9781538611807 (doi: 10.1109/APEC.2018.8341186)

Abstract

A short period, called dead time, is usually implemented (e.g., through adding extra hardware in gate drivers or modifying pulse-width modulation schemes) for voltage source inverters to prevent shoot-through incidents. Clearly, larger dead time provides more safety, but may also degrade the injected currents from inverters. It thus requires sophisticated compensation schemes to meet certain stringent standards. For single-phase transformerless full-bridge PV inverters, different modulation schemes can be employed to suppress leakage currents, which in return may affect the distribution of the dead time harmonics. Thus, this drives the analysis of dead time harmonics in single-phase transformerless full-bridge inverters considering two modulation strategies: bipolar and unipolar modulation schemes. Effects of modulation on the dead time harmonics are observed in simulations and experimental tests. Furthermore, a periodic controller is adopted to mitigate the harmonics, which is independent of the modulation schemes.

• Item Type: Conference Proceedings
• Additional Information: This work was supported in part by the European Commission within the European Union’s Seventh Framework Program (FP7/2007-2013) through the SOLAR-ERA.NET Transnational Project (PV2GRID), by Energinet.dk (ForskEL, Denmark, Project No. 2015-1-12359), and in part by the Research Promotion Foundation (RPF, Cyprus, Project No. KOINA/SOLARERA.NET/0114/02). The study was also supported by the European Research Council (ERC) under the European Unions Seventh Framework Program (FP/20072013)/ERC Grant Agreement [321149-Harmony].
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Zhou, Dr Keliang
• Authors: Yang, Y., Zhou, K., and Blaabjerg, F.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• ISSN: 2470-6647
• ISBN: 9781538611807
• Published Online: 19 April 2018
• Copyright Holders: Copyright © 2018 IEEE
• First Published: First published in 2018 IEEE Applied Power Electronics Conference and Exposition (APEC): 1310-1315
• Publisher Policy: Reproduced in accordance with the publisher copyright policy