Whenever a conflict between the estimated and measured state arises, a set of heuristic rules is activated for the fault scenario inference and report. An included SCADA helps operators in the fast processing of large amounts of data, due to the user-friendly graphical representation of the monitored system.
Enhanced with many heuristic rules, being a knowledge based system, the proposed system goes beyond imitation of expert operators’ knowledge, being able to inference fault scenarios concerning even components like the power electronic circuits of generator excitation system.
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For example, abnormal measurements on generator’s terminals can activate rules that will generate fault hypothesis possibly related to an excitation thyristors abnormal switching operation.
An Expert System (ES) is a computer program that uses knowledge and inference procedures to resolve problems that are ordinarily solved through human expertise.
The main components of an ES are: a) inference engine, b) database, c) user-interface.
ES incorporate rule kind of programming. They are currently being used in many applications in the area of power systems and power electronics. Several systems for the short or long term load forecasting have been already introduced based on ES technology. Intelligent SCADA and offline training systems for non-expert operators is another application where ES are often used.
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