Advances in impedance based fault location in distribution systems

Aboshady, Fathy (2019) Advances in impedance based fault location in distribution systems. PhD thesis, University of Nottingham.

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The transmission and distribution system is seeing an increasing penetration of embedded generation especially renewable energy sources (RES) and its resilience will be further challenged by the increasing electrification of

transport and heating/air conditioning. Renewable energy sources behave differently to conventional generation systems from both a power system protection and an operation point of view. For this reason, embedding renewable energy sources and its effect on the protection of the electricity system requires more investigation.

This thesis investigates the use of the high frequency transient generated when a fault occurs to locate the faults in distribution systems (frequency range up to 3 kHz). The project considers conventional distribution systems fed from one point and the modern distribution systems with embedded distributed generation. The effect of distributed generation on the fault location process is studied in two ways. Firstly, a high frequency model is developed for both inverter based and synchronous based distributed generation types. This allows the fault location algorithm to use the measurements at the main substation only. The inverter based distributed generation transfers power at the fundamental frequency with some low order and switching harmonics also being present. On the other hand, the synchronous based distributed generation can be assumed as a fundamental frequency voltage source. Therefore, approximations in the developed model will be different for the two types. The second approach assumes measurements at the distributed sources are available and a double end fault location algorithm is introduced.

The performance of the proposed fault location methods is evaluated through simulation of a medium voltage system. The simulation studies for different scenarios show the accuracy of the proposed concepts. The feasibility of the concepts is experimentally validated on a small scale 400 V system including the proposed single end method, the proposed high frequency model for the inverter based distributed generation and the proposed double end method.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Sumner, Mark
Thomas, David
Keywords: Impedance (Electricity); Electric fault location; Electric power distribution
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3001 Distribution or transmission of electric power
Faculties/Schools: UK Campuses > Faculty of Engineering
Item ID: 57178
Depositing User: Aboshady, Fathy
Date Deposited: 15 Sep 2023 08:18
Last Modified: 15 Sep 2023 08:18

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