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University of Manchester

1. Gutierrez Lagos, Luis Daniel. Advanced voltage control for energy conservation in distribution networks.

Degree: 2018, University of Manchester

The increasing awareness on the effect of carbon emissions in our planet has led to several countries to adopt targets for their reduction. One way of contributing to this aim is to use and distribute electricity more efficiently. In this context, Conservation Voltage Reduction (CVR), a well-known technique that takes advantage of the positive correlation between voltage and demand to reduce energy consumption, is gaining renewed interest. This technique saves energy by only reducing customer voltages, without relying on customer actions and, therefore, can be controlled by the Distribution Network Operator (DNO). CVR not only brings benefits to the electricity system by reducing generation requirements (fewer fossil fuel burning and carbon emissions), but also to customers, as energy bill reductions. The extent to which CVR can bring benefits mainly depends on the customers load composition and their voltages. While the former dictates the voltage-demand correlation, the latter constraints the voltage reduction that can be applied without violating statutory limits. Although CVR has been studied for many years, most of the studies neglect the time-varying voltage-demand characteristic of loads and/or do not assess end customer voltages. While these simplifications could be used to estimate CVR benefits for fixed and limited voltage reductions, realistic load and network models are needed to assess the performance of active CVR schemes, where voltages are actively managed to be close to the minimum limit. Moreover, distribution networks have been traditionally designed with limited monitoring and controllability. Therefore, CVR has been typically implemented by adopting conservative voltage reductions from primary substations, for both American and European-style networks. However, as new infrastructure is deployed in European-style LV networks (focus of this work), such as monitoring and on-load tap changers (OLTCs), the opportunity arises to actively manage voltages closer to end customer (unlocking further energy savings). Although these technologies have shown to effectively control voltages in LV networks, their potential for CVR has not been assessed before. Additionally, most CVR studies were performed in a context where distributed generation (DG) was not common. However, this has changed in many countries, with residential photovoltaic (PV) systems becoming popular. As this is likely to continue, the interactions of residential PV and CVR need to be studied. This thesis contributes to address the aforementioned literature gaps by: (i) proposing a simulation framework to characterise the time-varying voltage-demand correlation of individual end customers; (ii) developing a process to model real distribution networks (MV and LV) from DNO data; (iii) adopting a Monte Carlo-based quantification process to cater for the uncertainties related to individual customer demand; (iv) assessing the CVR benefits that can be unlocked with new LV infrastructure and different PV conditions. To accomplish (iv), first, a… Advisors/Committee Members: MUTALE, JOSEPH J, Ochoa, Luis Nando, Mutale, Joseph.

Subjects/Keywords: Conservation Voltage Reduction (CVR); Distribution Networks; On-load tap changers (OLTC); Optimal power flow (OPF); PV systems; Voltage control; Low voltage; Network operation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gutierrez Lagos, L. D. (2018). Advanced voltage control for energy conservation in distribution networks. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317466

Chicago Manual of Style (16th Edition):

Gutierrez Lagos, Luis Daniel. “Advanced voltage control for energy conservation in distribution networks.” 2018. Doctoral Dissertation, University of Manchester. Accessed January 23, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317466.

MLA Handbook (7th Edition):

Gutierrez Lagos, Luis Daniel. “Advanced voltage control for energy conservation in distribution networks.” 2018. Web. 23 Jan 2019.

Vancouver:

Gutierrez Lagos LD. Advanced voltage control for energy conservation in distribution networks. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2019 Jan 23]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317466.

Council of Science Editors:

Gutierrez Lagos LD. Advanced voltage control for energy conservation in distribution networks. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317466

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