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Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation / Omowumi Olasunkanmi

Swansea University Author: Omowumi Olasunkanmi

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DOI (Published version): 10.23889/SUthesis.66989

Abstract

High Voltage Direct Current (HVDC) technology has recently emerged as a significant option in current power networks to address power transmission challenges. Therefore, this research project examines the potential impact of HVDC technology on the Nigerian transmission system. Based on the informati...

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Published: Swansea, Wales, UK 2024
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Barron, Andrew B. ; Shirin, Alexander
URI: https://cronfa.swan.ac.uk/Record/cronfa66989
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Based on the information provided by the Nigerian Electricity System Operator (NESO), a model of the 330 kV transmission network in Nigeria was created using DIgSILENT PowerFactory. Summer and winter load flow scenarios were examined to enhance the model's precision and consistency. The system performance was evaluated through stability and reliability studies, which helped identify suitable locations for HVDC links. The load point indices (LPIs) and system indices were used for the reliability evaluation, while the PV and QV analyses were used for the stability evaluation. An HVDC model was created and connected to the transmission network at two locations identified by the studies, Gombe and Yola buses. A comparison was conducted using two separate HVDC connections (Case 1: Azura-Gombe and Case 2: Azura-Yola) to identify the critical impact of HVDC on the system reliability and stability. The reliability and stability simulation showed that HVDC technology significantly boosts the reliability and stability of the transmission network and reduces energy losses. However, adding an HVDC link between Azura and Yola, Case 2, significantly improved overall performance, as evidenced by improving the system and load point indices and a better voltage profile and reactive power margin. The system indices, SAIDI improved by 0.07 h/yr, SAIFI by 0.19 interruption/yr, and ASAI enhanced by 0.11%, while the LPIs improved effectively by zeroing the Load Point Interruption Frequency (LPIF) and Load Point Interruption Time (LPIT). During the stability analysis, the loadability increased by 119% while the critical point improved by 0.061 pu/ -394 MVAR. Economically, the cost incurred in Case 1 is 79.17% lower than the base case even though new equipment (HVDC) is installed; this also applies to Case 2, which is 85% lower than the base case. Integrating HVDC technology could improve financial gain, considering improved energy supply, increased production, and general economic growth. 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spelling v2 66989 2024-07-08 Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation b9908ef1660e299e3ed74b66740c1dd9 Omowumi Olasunkanmi Omowumi Olasunkanmi true false 2024-07-08 High Voltage Direct Current (HVDC) technology has recently emerged as a significant option in current power networks to address power transmission challenges. Therefore, this research project examines the potential impact of HVDC technology on the Nigerian transmission system. Based on the information provided by the Nigerian Electricity System Operator (NESO), a model of the 330 kV transmission network in Nigeria was created using DIgSILENT PowerFactory. Summer and winter load flow scenarios were examined to enhance the model's precision and consistency. The system performance was evaluated through stability and reliability studies, which helped identify suitable locations for HVDC links. The load point indices (LPIs) and system indices were used for the reliability evaluation, while the PV and QV analyses were used for the stability evaluation. An HVDC model was created and connected to the transmission network at two locations identified by the studies, Gombe and Yola buses. A comparison was conducted using two separate HVDC connections (Case 1: Azura-Gombe and Case 2: Azura-Yola) to identify the critical impact of HVDC on the system reliability and stability. The reliability and stability simulation showed that HVDC technology significantly boosts the reliability and stability of the transmission network and reduces energy losses. However, adding an HVDC link between Azura and Yola, Case 2, significantly improved overall performance, as evidenced by improving the system and load point indices and a better voltage profile and reactive power margin. The system indices, SAIDI improved by 0.07 h/yr, SAIFI by 0.19 interruption/yr, and ASAI enhanced by 0.11%, while the LPIs improved effectively by zeroing the Load Point Interruption Frequency (LPIF) and Load Point Interruption Time (LPIT). During the stability analysis, the loadability increased by 119% while the critical point improved by 0.061 pu/ -394 MVAR. Economically, the cost incurred in Case 1 is 79.17% lower than the base case even though new equipment (HVDC) is installed; this also applies to Case 2, which is 85% lower than the base case. Integrating HVDC technology could improve financial gain, considering improved energy supply, increased production, and general economic growth. This research has contributed significantly to revealed improvements in system and load indices, increased loadability, increased stability, and boosted financial gain with the HVDC connected. E-Thesis Swansea, Wales, UK Transmission System, load flow analysis, load-point indices, reliability analysis, critical demand, reactive power margin (RPM), DIgSILENT PowerFactory, VSC-HVDC, PV analysis, QV analysis, net present value (NPV), Discounted cash flow 22 5 2024 2024-05-22 10.23889/SUthesis.66989 COLLEGE NANME COLLEGE CODE Swansea University Barron, Andrew B. ; Shirin, Alexander Doctoral Ph.D Tertiary Education Trust Fund (TETFund) Federal Government of Nigeria Tertiary Education Trust Fund (TETFund) Federal Government of Nigeria 2024-07-10T08:41:56.0584909 2024-07-08T17:05:39.8997474 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering Omowumi Olasunkanmi 1 66989__30865__96749515f47d467097b3f294ccda491f.pdf Olasunkanmi_Omowumi_Grace_PhD_Thesis_Final_Redacted_Signature.pdf 2024-07-10T08:40:00.5714017 Output 1641784 application/pdf E-Thesis – open access true Copyright: The author, Omowumi G. Olasunkanmi, 2024.Released under the terms of a Creative Commons Attribution-Only (CC-BY) license. Third party content is excluded for use under the license terms. true eng https://creativecommons.org/licenses/by/4.0/deed.en
title Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
spellingShingle Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
Omowumi Olasunkanmi
title_short Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
title_full Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
title_fullStr Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
title_full_unstemmed Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
title_sort Application of HVDC transmission within Nigerian transmission system: technical and economic evaluation
author_id_str_mv b9908ef1660e299e3ed74b66740c1dd9
author_id_fullname_str_mv b9908ef1660e299e3ed74b66740c1dd9_***_Omowumi Olasunkanmi
author Omowumi Olasunkanmi
author2 Omowumi Olasunkanmi
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publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUthesis.66989
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering
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description High Voltage Direct Current (HVDC) technology has recently emerged as a significant option in current power networks to address power transmission challenges. Therefore, this research project examines the potential impact of HVDC technology on the Nigerian transmission system. Based on the information provided by the Nigerian Electricity System Operator (NESO), a model of the 330 kV transmission network in Nigeria was created using DIgSILENT PowerFactory. Summer and winter load flow scenarios were examined to enhance the model's precision and consistency. The system performance was evaluated through stability and reliability studies, which helped identify suitable locations for HVDC links. The load point indices (LPIs) and system indices were used for the reliability evaluation, while the PV and QV analyses were used for the stability evaluation. An HVDC model was created and connected to the transmission network at two locations identified by the studies, Gombe and Yola buses. A comparison was conducted using two separate HVDC connections (Case 1: Azura-Gombe and Case 2: Azura-Yola) to identify the critical impact of HVDC on the system reliability and stability. The reliability and stability simulation showed that HVDC technology significantly boosts the reliability and stability of the transmission network and reduces energy losses. However, adding an HVDC link between Azura and Yola, Case 2, significantly improved overall performance, as evidenced by improving the system and load point indices and a better voltage profile and reactive power margin. The system indices, SAIDI improved by 0.07 h/yr, SAIFI by 0.19 interruption/yr, and ASAI enhanced by 0.11%, while the LPIs improved effectively by zeroing the Load Point Interruption Frequency (LPIF) and Load Point Interruption Time (LPIT). During the stability analysis, the loadability increased by 119% while the critical point improved by 0.061 pu/ -394 MVAR. Economically, the cost incurred in Case 1 is 79.17% lower than the base case even though new equipment (HVDC) is installed; this also applies to Case 2, which is 85% lower than the base case. Integrating HVDC technology could improve financial gain, considering improved energy supply, increased production, and general economic growth. This research has contributed significantly to revealed improvements in system and load indices, increased loadability, increased stability, and boosted financial gain with the HVDC connected.
published_date 2024-05-22T08:41:55Z
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score 11.016079

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