Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

Ghanshyamsinh Gohil; Lorand Bede; Ramkrishan Maheshwari; Remus Teodorescu; Tamas Kerekes; Frede Blaabjerg

doi:10.1109/IECON.2014.7048730

Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

Ghanshyamsinh Gohil, Lorand Bede, Ramkrishan Maheshwari, Remus Teodorescu, Tamas Kerekes, Frede Blaabjerg

Aalborg University

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

The line current ripple and the size of the dc-link capacitor can be reduced by interleaving the carriers of the parallel connected Voltage Source Converters (VSCs). However, the interleaving of the carriers gives rise to the circulating current between the VSCs, and it should be suppressed. To limit the circulating current, magnetic coupling between the interleaved legs of the corresponding phase is provided by means of a Coupled Inductor (CI). The design of the CI is strongly influenced by the Pulsewidth Modulation (PWM) scheme used. The analytical model to evaluate the flux-linkage in the CI is presented in this paper. The maximum flux density and the core losses, being the most important parameters for the CI design, are evaluated for continuous PWM and discontinuous pulsewidth modulation (DPWM) schemes. The effect of these PWM schemes on the design of the CI is discussed. The simulation and the experimental results are finally presented to validate the analysis.

Original language	English
Title of host publication	IECON Proceedings (Industrial Electronics Conference)
Number of pages	7
Publisher	IEEE
Publication date	24. Feb 2014
Pages	1693-1699
Article number	7048730
ISBN (Electronic)	9781479940325
DOIs	https://doi.org/10.1109/IECON.2014.7048730
Publication status	Published - 24. Feb 2014

Keywords

Coupled inductor
Interleaving
Parallel
PWM
Voltage source converters (VSC)

Documents & Links

10.1109/IECON.2014.7048730

Cite this

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title = "Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor",

abstract = "The line current ripple and the size of the dc-link capacitor can be reduced by interleaving the carriers of the parallel connected Voltage Source Converters (VSCs). However, the interleaving of the carriers gives rise to the circulating current between the VSCs, and it should be suppressed. To limit the circulating current, magnetic coupling between the interleaved legs of the corresponding phase is provided by means of a Coupled Inductor (CI). The design of the CI is strongly influenced by the Pulsewidth Modulation (PWM) scheme used. The analytical model to evaluate the flux-linkage in the CI is presented in this paper. The maximum flux density and the core losses, being the most important parameters for the CI design, are evaluated for continuous PWM and discontinuous pulsewidth modulation (DPWM) schemes. The effect of these PWM schemes on the design of the CI is discussed. The simulation and the experimental results are finally presented to validate the analysis.",

keywords = "Coupled inductor, Interleaving, Parallel, PWM, Voltage source converters (VSC)",

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AU - Gohil, Ghanshyamsinh

AU - Bede, Lorand

AU - Maheshwari, Ramkrishan

AU - Teodorescu, Remus

AU - Kerekes, Tamas

AU - Blaabjerg, Frede

PY - 2014/2/24

Y1 - 2014/2/24

N2 - The line current ripple and the size of the dc-link capacitor can be reduced by interleaving the carriers of the parallel connected Voltage Source Converters (VSCs). However, the interleaving of the carriers gives rise to the circulating current between the VSCs, and it should be suppressed. To limit the circulating current, magnetic coupling between the interleaved legs of the corresponding phase is provided by means of a Coupled Inductor (CI). The design of the CI is strongly influenced by the Pulsewidth Modulation (PWM) scheme used. The analytical model to evaluate the flux-linkage in the CI is presented in this paper. The maximum flux density and the core losses, being the most important parameters for the CI design, are evaluated for continuous PWM and discontinuous pulsewidth modulation (DPWM) schemes. The effect of these PWM schemes on the design of the CI is discussed. The simulation and the experimental results are finally presented to validate the analysis.

AB - The line current ripple and the size of the dc-link capacitor can be reduced by interleaving the carriers of the parallel connected Voltage Source Converters (VSCs). However, the interleaving of the carriers gives rise to the circulating current between the VSCs, and it should be suppressed. To limit the circulating current, magnetic coupling between the interleaved legs of the corresponding phase is provided by means of a Coupled Inductor (CI). The design of the CI is strongly influenced by the Pulsewidth Modulation (PWM) scheme used. The analytical model to evaluate the flux-linkage in the CI is presented in this paper. The maximum flux density and the core losses, being the most important parameters for the CI design, are evaluated for continuous PWM and discontinuous pulsewidth modulation (DPWM) schemes. The effect of these PWM schemes on the design of the CI is discussed. The simulation and the experimental results are finally presented to validate the analysis.

KW - Coupled inductor

KW - Interleaving

KW - Parallel

KW - PWM

KW - Voltage source converters (VSC)

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BT - IECON Proceedings (Industrial Electronics Conference)

PB - IEEE

ER -

Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

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Keywords

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