An expert system for generating switching sequences in distribution substations

Pao Yue-kong Library Electronic Theses Database

An expert system for generating switching sequences in distribution substations

 

Author: Ho, Kwok-wah
Title: An expert system for generating switching sequences in distribution substations
Degree: M.Sc.
Year: 1999
Subject: Electric substations
Electric power systems
Expert systems (Computer science)
Switching theory
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electrical Engineering
Pages: iv, 59 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1517598
URI: http://theses.lib.polyu.edu.hk/handle/200/2827
Abstract: The objective of this dissertation is to present an intelligent approach to generate switching sequences in distribution substations by the use of an expert system. The developed expert system is designed for optimizing the switching sequences and generating the switching instructions (switching program) for the operational personnel's quick reference. An intelligent optimal sequence switching strategy for substations based on a knowledge-based modelling technique is developed and a typical distribution network of The Hongkong Electric Company Limited is used as an example for testing the validity of the approach. An expert system has been designed, implemented and tested for generating and optimizing the switching instructions that are required for the distribution substations outage of an electrical power system. Based on the knowledge-based modelling technique and developed using an object oriented programming language - 'Delphi 3.0', a windows-based application for the developed expert system has been successfully constructed to comprise a knowledge database, an inference engine and a user interface. The software program is targeted to run under Windows95/98, which provide an intelligent assistant to expertise for determining available switching sequences and preparing switching program (instructions) for distribution planned outage. Meanwhile, the developed knowledge-base can be supported to re-configure the network configuration without any modification of source program. The expert system has been tested in a practical 11kV distribution network which consists of busbars, ring main unit, cables and circuit breakers. Meanwhile, several power system configurations which are similar to those employed on Hong Kong Island are used for the performance evaluation and the results are consistent with the conclusions of experienced power system engineers working in power utilities. It has been recognized and concluded that by using an expert system, some optimized switching sequences or instructions could be accurately and efficiently produced with consistency for the expertise's knowledge. It is hoped that with this expert system which integrates the human expertise, the operation of the electrical power system would be enhanced while possible human errors during switching operations could be mininized.

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