Email {csr lff jsantos} @ dei.isep.ipp.pt

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The 1997 International Conference on

Intelligent Systems Applications To Power Systems

ISAP'97

Seoul, Korea

July 6-10, 1997

Title of Paper:

KNOWLEDGE-BASED SYSTEMS FOR POWER SYSTEM CONTROL

CENTERS: IS KNOWLEDGE THE PROBLEM?

Authors:

Zita A. Vale

University of Porto/Faculty of Engineering/Department of Electrical and Computer Engineering

Rua dos Bragas - 4099 Porto Codex - Portugal/Fax: 351-2-2041820 Phone: 351-2-2041820

Email: zav@fe.up.pt

Carlos Ramos

Luiz Faria

Jorge Santos

Polytechnic Institute of Porto (IPP)/Institute of Engineering/Department of Computer Engineering

Rua de S. Tomé - 4200 Porto - Portugal/Fax: 351-2-821159 Phone: 351-2-8340500

Email: {csr | lff | jsantos }@ dei.isep.ipp.pt

M. Fernanda Fernandes

Couto Rosado

Albino Marques

REN - Portuguese Transmission Network (EDP Group)

Rua Cidade de Goa, 4 - 2685 Sacavém - Portugal/Fax: 351-1-9411318 Phone: 351-1-9411262 KNOWLEDGE-BASED SYSTEMS FOR POWER SYSTEM CONTROL

CENTERS: IS KNOWLEDGE THE PROBLEM?

Zita A. Vale

University of Porto/Faculty of Engineering/Department of Electrical and Computer Engineering

Rua dos Bragas - 4099 Porto Codex - Portugal/Fax: 351-2-2041820 Phone: 351-2-2041820

Email: zav@fe.up.pt

Carlos Ramos ; Luiz Faria ; Jorge Santos

Polytechnic Institute of Porto (IPP)/Institute of Engineering/Department of Computer Engineering

Rua de S. Tomé - 4200 Porto - Portugal/Fax: 351-2-821159 Phone: 351-2-8300922

Email: {csr | lff | jsantos }@ dei.isep.ipp.pt

M. Fernanda Fernandes ; Couto Rosado ; Albino Marques

REN - Portuguese Transmission Network (EDP Group)

Rua Cidade de Goa, 4 - 2685 Sacavém - Portugal/Fax: 351-1-9411318 Phone: 351-1-9411262

Abstract: The use of Knowledge-Based Systems (KBS) in Power System Control Centres is today recognised as a good way to

provide Control Center operators with decision support tools. Power Systems can be considered as an important field of application of

Knowledge-Based Systems not only because of the high number of applications but also because of the challenge that Power System

application usually represent to the development of this kind of applications. This is perhaps the right time to make a balance of the success of

these applications and to use the acquired experience to learn some lessons for the future.

In this paper, we present the experience of developing SPARSE, a Knowledge-Based System for assisting Portuguese Transmission Control

Center operators in incident analysis and power restoration. Based on our experience, the reasons that contribute for the success or for the failure

of such a project are discussed.

Keywords: Control Centers, Experts, Knowledge, Knowledge-Based Systems, Real time

1. INTRODUCTION

Modern Power System Control Centres (CC) operate and

control medium and large electrical networks using real-time

information acquired trough a complex SCADA (Supervisory

Control and Data Acquisition) system. Some years ago, a new

generation of computer applications started to be included in

these Control Centres in addition to the traditional computer

applications as load flow, state estimation, contingency analysis

and short-circuit analysis. This new generation of computer

applications is based on Artificial Intelligence techniques and its

main goal is to support operators in decision making.

The use of these intelligent applications is especially

important under incident conditions when a huge volume of

information can arrive to the Control Center making Control

Center operator tasks very complex. Among intelligent

applications, Knowledge-Based Systems (KBS) play a very

important role corresponding to some important and successful

achievements.

More than a decade after the first intelligent applications has

been proposed for Power Systems [Wol-86], a lot of other

applications have been developed all over the world [Cig-93]

and Power Systems can be considered an important field for intelligent applications, especially for Knowledge-Based

Systems and Expert Systems [Dur-96].

This is perhaps the right time to make a balance of the

success of these applications and to use the acquired

experience to learn some lessons for the future [Val-96b].

In this paper, we present the experience of developing

SPARSE, a Knowledge-Based System for assisting

Portuguese Transmission Control Center operators in incident

analysis and power restoration. Based on our experience, the

reasons that contribute for the success or for the failure of such

a project are discussed.

2. KNOWLEDGE AS THE MAIN PROBLEM OF KBS

KBS are recognised as having many advantages when

compared to traditional computer applications but their most