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PDF of thesis T13479 PDF of thesis T13479 - (6 M)
Title Protection of physically compact multiterminal DC power systems / by Steven Fletcher.
Name Fletcher, Steven. .
Abstract The use of DC for primary power distribution has the potential to bring significant design, cost and effciency benefits to microgrid, ship- board and aircraft applications. The integration of active converter technologies within these networks is a key enabler for these bene ts to be realised, however their in uence on an electrical network's fault response can lead to exceptionally demanding protection requirements. This represents a significant barrier to more widespread adoption of DC power distribution. The principle challenge within the field is to develop protection solutions which do not significantly detract from the advantages which DC networks offer. This objective leads the thesis to not only consider how the protection challenges may be overcome but also how this can be achieved in a manner which can benefit the overall design of a system, inclusive of various system design objectives. The thesis proposes that this objective can be achieved through the operati on of network protection within the initial transient period following the occurrence of a fault. In seeking to achieve this aim, the work presented within this thesis makes a number of contributions. The thesis categorises converter type based on the components which in uence their fault response and then presents an analysis of the natural fault response of compact multiterminal DC power distribution networks containing these converters. Key factors such as the peak magnitudes and formation times of fault current profiles are determined and quantified as a function of network parameters, enabling protection system operating requirements to be established. Secondary fault effects such as voltage transients are also identified and quantified to illustrate the impact of suboptimal protection system operation. The capabilities of different protection methods and technologies for achieving the proposed
Abstract operating requirements are then analysed. Significant conclusions are: solid  state breaking technologies are essential to achieving operating targets and severe limitations exist with the application of protection methods available within literature for this application. To overcome these shortfalls, novel fault detection approaches are proposed and analysed. These approaches enable fault detection time targets to be met as well as aid with the effective integration of future circuit breaking technologies.
Publication date 2013
Name University of Strathclyde. Dept. of Electronic and Electrical Engineering
Thesis note Thesis PhD University of Strathclyde 2013 T13479
System Number 000002375

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