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Protection of the Inter-Tie between an Industrial Cogenerator and a Utility

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dc.contributor.advisor Edwards, David C.
dc.contributor.advisor Deans, Prof. N. D.
dc.contributor.author Mollah, Abdur Rahim
dc.date.accessioned 2018-08-09T15:06:25Z
dc.date.available 2018-08-09T15:06:25Z
dc.date.copyright 1990
dc.date.issued 1990-11
dc.identifier.other ID 0000000
dc.identifier.uri http://hdl.handle.net/20.500.12228/271
dc.description This thesis is submitted in partial fulfilment of the requirements of the Council for National Academic Awards for the degree of Doctor of Philosophy in Electronic and Electrical Engineering, November 1990. en_US
dc.description Cataloged from PDF Version of Thesis.
dc.description Includes bibliographical references (pages 173-180).
dc.description.abstract The work presented in this thesis is concerned with the development of a microprocessor based technique to detect and locate symmetrical and unsymmetrical faults on the interfacing network of a utility interconnected industrial cogenerator system; and to identify the type of the detected fault. In order to provide operational flexibility and supply security to such an interconnected industrial cogenerator plant, fault location is regarded as being of prime importance. Current protection practices using conventional technology for this sort of interconnected cogeneration system were reviewed. A relay coordination study was carried out on a simulated utility interconnected cogeneration system. This resulted in identification of the problems and limitations of the application of standard IDMT relays for overcurrent protection of such a system. A review of digital protection, and its various algorithms, was undertaken. This provided the basis for a rational choice of algorithm for the proposed new technique. The sequence of functions of the protection scheme's algorithm, based on the proposed technique, can be presented in brief as follows: First, phase currents at selected positions on the system are sampled. The positive phase sequence (pps) currents at those positions are then obtained in digitised form from the sampled phase currents. Then, these pps currents, containing fundamentals along with other harmonics and dc offsets, are used in a Fourier filtering algorithm to extract only fundamental components in rectangular forms. Signs of imaginary parts of these components are then used to determine the directions of pps currents at the selected positions. The industrial bus voltage is used as the polarising reference. Finally these directions are based in a fault detection aridlocat1on subroutine to determine the location of any fault under such conditions. After detecting a fault and locating its position, the type of fault is determined from off-line analysis of the postfault phase currents. The analysis is based on identifying the phases carrying the maximum fault current and checking the presence of zero sequence current. The proposed protection scheme has been tested on a computer simulated system which consists of a utility interconnected to an industrial plant with cogeneration. The performance has been found to be satisfactory for all kinds of solid and low are resistance faults anywhere on the interfacing network between the systems. en_US
dc.description.statementofresponsibility Abdur Rahim Mollah
dc.format.extent 196 pages
dc.language.iso en_US en_US
dc.publisher Robert Gordon's Institute of Technology, Aberdeen, Scotland en_US
dc.rights Khulna University of Engineering & Technology (KUET) thesis/dissertation/internship reports are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.
dc.subject Symmetrical and Unsymmetrical Faults en_US
dc.subject Interfacing Network en_US
dc.subject Industrial Cogenerator System en_US
dc.title Protection of the Inter-Tie between an Industrial Cogenerator and a Utility en_US
dc.type Thesis en_US
dc.description.degree Doctor of Philosophy in Electronic and Electrical Engineering
dc.contributor.department School of Electronic and Electrical Engineering

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