Alharbi, Bader (2022). Stress assessment of modern power systems with dynamic thermal limits of lines. University of Birmingham. Ph.D.
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Alharbi2022PhD.pdf
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Abstract
The drive toward low-carbon technologies is presenting today’s power grid operators with an expanding range of unexpected challenges stemming from the rising penetration of renewable resources. Extra-challenging grid operation and greater system stress are consequences of the randomness that characterises photovoltaic (PV) and wind generation and that reflects the use of charging stations for plug-in electric vehicles (PEVs), whose growing acceptance is also elevating demand. All of these complications can lead to aggravated stress on transmission lines. However, the strategic application of dynamic thermal limits (DTLs) on those lines can alleviate the effects of such grid-impacting changes.
For these reasons, the research reported in this thesis was aimed at using DTLs to address these issues and to evaluate stress levels associated with the presence of low-carbon sources in combination with the use of DTLs on transmission lines. Innovative frameworks are introduced for estimating and comparing stress levels created by PV and wind power generation and by PEV stations for a variety of DTL application scenarios. In particular, innovative approaches are proposed for assessing system stress in PV integrated systems that feature DTLs on transmission lines. The first of these is targeted at evaluating the stress-related impact of PV generation on generation and load buses for different geographic sites with varied levels of DTL line application. The second approach provides stress assessments of PV integrated modern power systems in which DTLs are applied only on critical transmission lines. Another inventive framework evaluates the stress impact of the introduction of PEV charging stations into a power system with DTL application on the least stressed transmission line and with integrated wind farms. Other developments include new PEV modelling, and a novel stress map based on system stress levels, whose application in a modern power system is assessed using original systematic frameworks for strategic PEV incorporation and DTL line application in a wind integrated power system.
Initial evaluations revealed only minor effects of DTL line application on system stress levels in PV integrated power systems, which emphasised the importance of exploring the utilisation of transmission line DTLs in a manner that would be beneficial for power systems. However, a considerable decline in the stress level is evident when DTLs are applied on critical lines in PV integrated power systems. Another finding is that the impact of DTL line application on wind integrated power systems with the incorporation of PEV charging stations can lead to considerably decrease in associated system stress levels. The proposed novel stress map exhibits impressive performance in a modern power grid with respect to the strategic incorporation of PEV stations and the application of DTLs on transmission lines. The results also suggest that the strategic incorporation of PEVs in either charging (G2V) or discharging (V2G) mode potentially help mitigate system stress levels. The validation of the innovative stress assessment frameworks presented in the thesis has demonstrated the enhancements available to modern power systems when DTLs are applied on transmission lines in conjunction with the integration of low-carbon technologies.
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Engineering, Department of Electronic, Electrical and Systems Engineering | |||||||||
| Funders: | Other | |||||||||
| Other Funders: | Majmaah University, Saudi Arabia represented by Saudi Arabian Cultural Bureau in London | |||||||||
| Subjects: | Q Science > QC Physics T Technology > T Technology (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| URI: | http://etheses.bham.ac.uk/id/eprint/12766 |
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