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A fast-acting protection scheme for series compensators in a medium-voltage network
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Bashar, E. (2020) A fast-acting protection scheme for series compensators in a medium-voltage network. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3493135~S15
Abstract
In recent 20 years medium voltage networks have been becoming one of the important interfaces between the power plants and loads due to the increasing load demand as well as number of distributed generators connected to the network. This is the reason, managing the power flow, and voltage profile of the network at the lowest possible power losses and also price are of the utmost importance.
The series compensators such as a static synchronous series compensator are of the most cost effective power compensators that also have the high efficiency in controlling the power flow and voltage profile. However, their drawback is their vulnerability against the short circuit. This thesis presents a new protection scheme for an SSSC in an MV network by using a varistor and thyristors to eliminate this weakness.
The DC offset phenomenon is one of the main uncertainties that has been studied in the thesis. This phenomenon could cause a delay in the circuit breakers’ performance. In this thesis, the parameters of the machines that have most influence on the time when the fault current will pass the zero point have been analysed. Besides, the impact of the DC offset in the medium voltage network has been studied.
Furthermore, the thermal issues have always been one of the most challenging problems for the power electronics devices. This thesis investigates a new packaging style by using the phase change material to improve the thermal managing of a press-pack thyristor during a short circuit. This packaging style is able to absorb the heat as much as required and also could decrease the thermal resistance.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Library of Congress Subject Headings (LCSH): | Electric networks -- Protection, Voltage regulators -- Design and construction | ||||
Official Date: | January 2020 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Ran, Li | ||||
Sponsors: | Engineering and Physical Sciences Research Council | ||||
Format of File: | |||||
Extent: | xviii, 185 leaves : illustrations (some colour) | ||||
Language: | eng |
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