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Decoupled steady-state model of the modular multilevel converter with half-bridge cells
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
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2012 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Modular multilevel converters, based on cascading of halfbridge converter cells, can combine low switching frequency with low harmonic interference. They can be designed for high operating voltages without direct series connection of semiconductor elements. This has led to a rapid adoption within high-power applications such as HVDC, STATCOM and railway interties. Analysing the operation of these converters in the frequency domain poses a few challenges due to the presence of significant low-order harmonic voltages in the cell capacitors. This paper presents a frequency-domain model of the MMC converter with halfbridge cells, based on a two-stage approach. First, the circuit equations are decoupled by a simple linear transformation, whereby the circuit schematic can be separated into a dc-side and an ac-side part. Second, the switching operation within the phase arms is modelled in the frequency domain by iterated convolution. The model is verified against a timedomain simulation of a converter with ratings valid for HVDC applications. It is shown that the proposed methodology, where all calculations are made in the frequency domain, can accurately reproduce the results from the simulation.

Place, publisher, year, edition, pages
IET, 2012.
Keyword [en]
Cascaded Converter, Modular Multilevel Converter, Frequency domain
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-101732DOI: 10.1049/cp.2012.0232Scopus ID: 2-s2.0-84864646954OAI: oai:DiVA.org:kth-101732DiVA: diva2:548961
Conference
6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012),27-29 MArch, 2012
Funder
StandUp
Note

QC 20121112

Available from: 2012-11-12 Created: 2012-09-03 Last updated: 2013-10-02Bibliographically approved

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CiteExportLink to record
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Citation style
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  • nn-NB
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Output format
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