Unipolar stitched inverter low-frequency harmonics caused by stitching delay

Article

Sharma, R. and Ball, J. A. R.. 2009. "Unipolar stitched inverter low-frequency harmonics caused by stitching delay." IET Power Electronics. 2 (5), pp. 508-516. https://doi.org/10.1049/iet-pel.2008.0133
Article Title

Unipolar stitched inverter low-frequency harmonics caused by stitching delay

ERA Journal ID40528
Article CategoryArticle
AuthorsSharma, R. (Author) and Ball, J. A. R. (Author)
Journal TitleIET Power Electronics
Journal Citation2 (5), pp. 508-516
Number of Pages9
Year2009
Place of PublicationStevenage, UK
ISSN1755-4535
1755-4543
Digital Object Identifier (DOI)https://doi.org/10.1049/iet-pel.2008.0133
Abstract

Unipolar switched single-phase inverters experience lower switching losses and generate less electro-magnetic interference (EMI) when compared with bipolar switched inverters. However, these benefits come at the expense of increased distortion in the current waveform near the voltage zero crossing. Furthermore, it is demonstrated in this paper that circuit delay is a major cause of the generation of low-frequency harmonics (LFH). A new analytical method to explain why circuit delays are responsible for the generation of LFH in unipolar switched inverters, and not in bipolar switched inverters, is presented. Numerical results calculated from this theory are compared with simulation and experimental results to illustrate this relationship.

Keywordselectromagnetic interference; harmonic analysis; invertors; numerical analysis
ANZSRC Field of Research 2020401703. Energy generation, conversion and storage (excl. chemical and electrical)
490406. Lie groups, harmonic and Fourier analysis
400805. Electrical energy transmission, networks and systems
Byline AffiliationsDepartment of Electrical, Electronic and Computer Engineering
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