Zero-current switching for the alternate arm converter through on-load tap changers
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 al...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/144596 |
| _version_ | 1811689373084680192 |
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| author | Wickramasinghe, Harith R. Konstantinou, Georgios Pou, Josep |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Wickramasinghe, Harith R. Konstantinou, Georgios Pou, Josep |
| author_sort | Wickramasinghe, Harith R. |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T05:47:04Z |
| format | Conference Paper |
| id | ntu-10356/144596 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:47:04Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1445962020-11-13T08:44:45Z Zero-current switching for the alternate arm converter through on-load tap changers Wickramasinghe, Harith R. Konstantinou, Georgios Pou, Josep School of Electrical and Electronic Engineering 2018 IEEE Energy Conversion Congress and Exposition (ECCE) Engineering::Electrical and electronic engineering Alternate Arm Converter (AAC) Zero-current Switching 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. Accepted version This research was supported under Australian Research Council’s Discovery Early Career Research Award (DECRA - DE170100370). 2020-11-13T08:44:45Z 2020-11-13T08:44:45Z 2018 Conference Paper Wickramasinghe, H. R., Konstantinou, G., & Pou, J. (2018). Zero-current switching for the alternate arm converter through on-load tap changers. Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition (ECCE), 1342-1347. doi:10.1109/ECCE.2018.8557788 978-1-4799-7313-2 https://hdl.handle.net/10356/144596 10.1109/ECCE.2018.8557788 1342 1347 en © 20XX IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/ECCE.2018.8557788. application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Alternate Arm Converter (AAC) Zero-current Switching Wickramasinghe, Harith R. Konstantinou, Georgios Pou, Josep Zero-current switching for the alternate arm converter through on-load tap changers |
| title | Zero-current switching for the alternate arm converter through on-load tap changers |
| title_full | Zero-current switching for the alternate arm converter through on-load tap changers |
| title_fullStr | Zero-current switching for the alternate arm converter through on-load tap changers |
| title_full_unstemmed | Zero-current switching for the alternate arm converter through on-load tap changers |
| title_short | Zero-current switching for the alternate arm converter through on-load tap changers |
| title_sort | zero current switching for the alternate arm converter through on load tap changers |
| topic | Engineering::Electrical and electronic engineering Alternate Arm Converter (AAC) Zero-current Switching |
| url | https://hdl.handle.net/10356/144596 |
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