Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers

Harith R. Wickramasinghe; Georgios Konstantinou; Josep Pou

doi:10.1109/ECCE.2018.8557788

Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers

Harith R. Wickramasinghe, Georgios Konstantinou, Josep Pou

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

The combined operation of the two arms of an alternate arm converter (AAC) phase-leg is essential for SM capacitor energy balancing but is limited to a small overlap period. The director switches (DSs) operate alternatively and the overlapping operation of the DSs provides the overlap period. The alternate operation of the two arms leads to arm inductor current interruptions increasing voltage stresses across DSs during normal operation. This paper proposes a coordinated operation of the AAC operating point and transformer on-load tap changers (OLTCs) based on power reference set-points in order to achieve ZCS of the DSs regardless of the AAC operating mode. The coordinated operation utilizes the tap positions of the converter transformer effectively and extends the operating range that offers ZCS of the DSs without additional efforts of circulating current control. Results from an AAC-based HVDC converter model derived from the CIGRE benchmark MMC system demonstrate the effective use of the transformer OLTC to achieve ZCS of the DSs in AACs.

Original language	English
Title of host publication	2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1342-1347
Number of pages	6
ISBN (Electronic)	9781479973118
DOIs	https://doi.org/10.1109/ECCE.2018.8557788
Publication status	Published - Dec 3 2018
Externally published	Yes
Event	10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States Duration: Sept 23 2018 → Sept 27 2018

Publication series

Name	2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Conference

Conference	10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
Country/Territory	United States
City	Portland
Period	9/23/18 → 9/27/18

Bibliographical note

Publisher Copyright:
© 2018 IEEE.

ASJC Scopus Subject Areas

Energy Engineering and Power Technology
Renewable Energy, Sustainability and the Environment
Control and Optimization
Computer Networks and Communications
Hardware and Architecture
Information Systems and Management

Keywords

Alternate arm converter (AAC)
High-voltage direct-current
Multilevel converter
Zero-current switching

UN SDGs

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

Access to Document

10.1109/ECCE.2018.8557788

Cite this

Wickramasinghe, H. R., Konstantinou, G., & Pou, J. (2018). Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers. In 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 (pp. 1342-1347). Article 8557788 (2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2018.8557788

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title = "Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers",

abstract = "The combined operation of the two arms of an alternate arm converter (AAC) phase-leg is essential for SM capacitor energy balancing but is limited to a small overlap period. The director switches (DSs) operate alternatively and the overlapping operation of the DSs provides the overlap period. The alternate operation of the two arms leads to arm inductor current interruptions increasing voltage stresses across DSs during normal operation. This paper proposes a coordinated operation of the AAC operating point and transformer on-load tap changers (OLTCs) based on power reference set-points in order to achieve ZCS of the DSs regardless of the AAC operating mode. The coordinated operation utilizes the tap positions of the converter transformer effectively and extends the operating range that offers ZCS of the DSs without additional efforts of circulating current control. Results from an AAC-based HVDC converter model derived from the CIGRE benchmark MMC system demonstrate the effective use of the transformer OLTC to achieve ZCS of the DSs in AACs.",

keywords = "Alternate arm converter (AAC), High-voltage direct-current, Multilevel converter, Zero-current switching",

author = "Wickramasinghe, {Harith R.} and Georgios Konstantinou and Josep Pou",

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doi = "10.1109/ECCE.2018.8557788",

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Wickramasinghe, HR, Konstantinou, G & Pou, J 2018, Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers. in 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018., 8557788, 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018, Institute of Electrical and Electronics Engineers Inc., pp. 1342-1347, 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018, Portland, United States, 9/23/18. https://doi.org/10.1109/ECCE.2018.8557788

Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers. / Wickramasinghe, Harith R.; Konstantinou, Georgios; Pou, Josep.
2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. Institute of Electrical and Electronics Engineers Inc., 2018. p. 1342-1347 8557788 (2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AU - Konstantinou, Georgios

AU - Pou, Josep

PY - 2018/12/3

Y1 - 2018/12/3

N2 - The combined operation of the two arms of an alternate arm converter (AAC) phase-leg is essential for SM capacitor energy balancing but is limited to a small overlap period. The director switches (DSs) operate alternatively and the overlapping operation of the DSs provides the overlap period. The alternate operation of the two arms leads to arm inductor current interruptions increasing voltage stresses across DSs during normal operation. This paper proposes a coordinated operation of the AAC operating point and transformer on-load tap changers (OLTCs) based on power reference set-points in order to achieve ZCS of the DSs regardless of the AAC operating mode. The coordinated operation utilizes the tap positions of the converter transformer effectively and extends the operating range that offers ZCS of the DSs without additional efforts of circulating current control. Results from an AAC-based HVDC converter model derived from the CIGRE benchmark MMC system demonstrate the effective use of the transformer OLTC to achieve ZCS of the DSs in AACs.

AB - The combined operation of the two arms of an alternate arm converter (AAC) phase-leg is essential for SM capacitor energy balancing but is limited to a small overlap period. The director switches (DSs) operate alternatively and the overlapping operation of the DSs provides the overlap period. The alternate operation of the two arms leads to arm inductor current interruptions increasing voltage stresses across DSs during normal operation. This paper proposes a coordinated operation of the AAC operating point and transformer on-load tap changers (OLTCs) based on power reference set-points in order to achieve ZCS of the DSs regardless of the AAC operating mode. The coordinated operation utilizes the tap positions of the converter transformer effectively and extends the operating range that offers ZCS of the DSs without additional efforts of circulating current control. Results from an AAC-based HVDC converter model derived from the CIGRE benchmark MMC system demonstrate the effective use of the transformer OLTC to achieve ZCS of the DSs in AACs.

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KW - High-voltage direct-current

KW - Multilevel converter

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ER -

Wickramasinghe HR, Konstantinou G, Pou J. Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers. In 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. Institute of Electrical and Electronics Engineers Inc. 2018. p. 1342-1347. 8557788. (2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018). doi: 10.1109/ECCE.2018.8557788

Zero-Current Switching for the Alternate Arm Converter through On-Load Tap Changers

Abstract

Publication series

Conference

Bibliographical note

ASJC Scopus Subject Areas

Keywords

UN SDGs

Access to Document

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Cite this