Thesis
Coordination of quadrature booster transformers
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2022
- Thesis identifier
- T16480
- Person Identifier (Local)
- 200952438
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- Quadrature booster (QB) transformers and other power flow control devices can help make better use of existing (or planned) electricity transmission network capacity. They are able to increase the transmission transfer capacity of an area – the power that can be securely transferred out of it or into it before there is a need for renewable or other high merit/low cost generation to be constrained off somewhere on the system – and thus enable a more economic operation of the system. The QBs are more effective when used in a coordinated way and the tap settings of multiple devices are optimised towards a common objective. This work develops comprehensive and practical framework for the coordination of tap settings of multiple QBs based on mathematical programming methods. It takes into account many of the factors that system operator (SO) engineers must consider when preparing a plan of actions to operate the system in such a way that the cost of operating the system is minimised and the security and reliability is ensured. The framework is used to examine alternative strategies (operational objectives) regarding the coordinated use of QBs. The two key parameters considered are the extent of use of QBs for preventive and corrective actions – both in isolation and when combined. Each strategy achieves a different level of economy and ‘complexity’ of operation while maintaining the same, pre-defined, level of security. A study is setup to calculate the preventive generation redispatch cost (constraint cost) that results from using the QBs according to each strategy and to help draw conclusions. It is found that the active and coordinated use of QBs in multiple locations for preventive actions is the single most important parameter (amongst the two previously mentioned) in order to reduce constraint cost. It is recommended that strategies that favour the active preventive use of QBs are preferred against ones that limit the preventive use in order to maximise their post-fault utilisation. The reason for that is the different mechanisms through which the extent of preventive and corrective use of QBs contribute to the reduction of constraint cost. It is also recommended that, if able, QBs are used for both preventive and corrective actions and to a high ‘extent’1. The analysis shows that, use of QBs in that way can result in a 36% reduction in the preventive generation re-dispatch cost, in the course of a simulated year of operation, over a strategy where QBs are not used at all for either preventive or corrective actions or 8.6% over a strategy where QBs are used for preventive and corrective actions but not to a high ‘extent’. So, the novelty and contribution of this work is twofold. First, the developed framework is a comprehensive, practical and complete method for coordinating the QB tap settings and it also addresses many of the considerations of SO engineers in a way that it could be readily used to enhance existing processes. Second, it draws a clear conclusion regarding what is the best way to utilise the QB devices that is supported by bespoke analysis and data.
- Advisor / supervisor
- Bell, Keith
- Kockar, Ivana
- Resource Type
- DOI
Relations
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PDF of thesis T16480 | 2023-02-22 | Public | Download |
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File | 2023-02-22 | Private |