Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current

Zhi Xiang Zou; Frederik Hahn; Sebastian Brueske; Sandro Guenter; Giampaolo Buticchi; Marco Liserre; Friedrich W. Fuchs

doi:10.1109/ECCE.2017.8096882

Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current

Zhi Xiang Zou
, Frederik Hahn
, Sebastian Brueske
, Sandro Guenter
, Giampaolo Buticchi
, Marco Liserre
, Friedrich W. Fuchs

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

4 Citations (Scopus)

Abstract

Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation. This paper aims at investigating the influence of different modulation techniques on the circulating current of parallel Neutral-Point Clamped (NPC) inverters under interleaved operation. Two modulation techniques: Phase Disposition (PD) and Alternative Phase Opposite Disposition (APOD), have been studied and compared in terms of current ripple, spectrum quality, and circulating current. Though the PD modulation was regarded as the optimum solution in most single NPC cases, it offers worse performance in the parallel NPC application due to higher circulating current. Simulation and experimental validations are provided and show that the APOD leads to much lower circulating current and similar current ripple as well as spectrum quality compared to the PD.

Original language	English
Title of host publication	2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	5254-5261
Number of pages	8
ISBN (Electronic)	9781509029983
DOIs	https://doi.org/10.1109/ECCE.2017.8096882
Publication status	Published - 3 Nov 2017
Externally published	Yes
Event	9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States Duration: 1 Oct 2017 → 5 Oct 2017

Publication series

Name	2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Volume	2017-January

Conference

Conference	9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
Country/Territory	United States
City	Cincinnati
Period	1/10/17 → 5/10/17

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Free Keywords

APOD
Circulating current
Interleaved operation
Npc inverters
PD

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering
Renewable Energy, Sustainability and the Environment
Control and Optimization

Access to Document

10.1109/ECCE.2017.8096882

Cite this

Zou, Z. X., Hahn, F., Brueske, S., Guenter, S., Buticchi, G., Liserre, M., & Fuchs, F. W. (2017). Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current. In 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017 (pp. 5254-5261). Article 8096882 (2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017; Vol. 2017-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2017.8096882

@inproceedings{d30d66e11a534d62b62d588f47601b12,

title = "Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current",

abstract = "Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation. This paper aims at investigating the influence of different modulation techniques on the circulating current of parallel Neutral-Point Clamped (NPC) inverters under interleaved operation. Two modulation techniques: Phase Disposition (PD) and Alternative Phase Opposite Disposition (APOD), have been studied and compared in terms of current ripple, spectrum quality, and circulating current. Though the PD modulation was regarded as the optimum solution in most single NPC cases, it offers worse performance in the parallel NPC application due to higher circulating current. Simulation and experimental validations are provided and show that the APOD leads to much lower circulating current and similar current ripple as well as spectrum quality compared to the PD.",

keywords = "APOD, Circulating current, Interleaved operation, Npc inverters, PD",

author = "Zou, \{Zhi Xiang\} and Frederik Hahn and Sebastian Brueske and Sandro Guenter and Giampaolo Buticchi and Marco Liserre and Fuchs, \{Friedrich W.\}",

note = "Publisher Copyright: {\textcopyright} 2017 IEEE.; 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 ; Conference date: 01-10-2017 Through 05-10-2017",

year = "2017",

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doi = "10.1109/ECCE.2017.8096882",

language = "English",

series = "2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017",

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}

Zou, ZX, Hahn, F, Brueske, S, Guenter, S, Buticchi, G, Liserre, M & Fuchs, FW 2017, Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current. in 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017., 8096882, 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, vol. 2017-January, Institute of Electrical and Electronics Engineers Inc., pp. 5254-5261, 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017, Cincinnati, United States, 1/10/17. https://doi.org/10.1109/ECCE.2017.8096882

Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current. / Zou, Zhi Xiang; Hahn, Frederik; Brueske, Sebastian et al.
2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Institute of Electrical and Electronics Engineers Inc., 2017. p. 5254-5261 8096882 (2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017; Vol. 2017-January).

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current

AU - Zou, Zhi Xiang

AU - Hahn, Frederik

AU - Brueske, Sebastian

AU - Guenter, Sandro

AU - Buticchi, Giampaolo

AU - Liserre, Marco

AU - Fuchs, Friedrich W.

PY - 2017/11/3

Y1 - 2017/11/3

N2 - Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation. This paper aims at investigating the influence of different modulation techniques on the circulating current of parallel Neutral-Point Clamped (NPC) inverters under interleaved operation. Two modulation techniques: Phase Disposition (PD) and Alternative Phase Opposite Disposition (APOD), have been studied and compared in terms of current ripple, spectrum quality, and circulating current. Though the PD modulation was regarded as the optimum solution in most single NPC cases, it offers worse performance in the parallel NPC application due to higher circulating current. Simulation and experimental validations are provided and show that the APOD leads to much lower circulating current and similar current ripple as well as spectrum quality compared to the PD.

AB - Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation. This paper aims at investigating the influence of different modulation techniques on the circulating current of parallel Neutral-Point Clamped (NPC) inverters under interleaved operation. Two modulation techniques: Phase Disposition (PD) and Alternative Phase Opposite Disposition (APOD), have been studied and compared in terms of current ripple, spectrum quality, and circulating current. Though the PD modulation was regarded as the optimum solution in most single NPC cases, it offers worse performance in the parallel NPC application due to higher circulating current. Simulation and experimental validations are provided and show that the APOD leads to much lower circulating current and similar current ripple as well as spectrum quality compared to the PD.

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KW - Circulating current

KW - Interleaved operation

KW - Npc inverters

KW - PD

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DO - 10.1109/ECCE.2017.8096882

M3 - Conference contribution

AN - SCOPUS:85041354671

T3 - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017

SP - 5254

EP - 5261

BT - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017

Y2 - 1 October 2017 through 5 October 2017

ER -

Zou ZX, Hahn F, Brueske S, Guenter S, Buticchi G, Liserre M et al. Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current. In 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Institute of Electrical and Electronics Engineers Inc. 2017. p. 5254-5261. 8096882. (2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017). doi: 10.1109/ECCE.2017.8096882

Interleaved operation of parallel neutral-point clamped inverters with reduced circulating current

Abstract

Publication series

Conference

UN SDGs

Free Keywords

ASJC Scopus subject areas

Access to Document

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