An Expert System Based Power System Modeling And Analysis With Symmetrical Components

Marizan, Sulaiman and Zainuddin, Mat Isa (2005) An Expert System Based Power System Modeling And Analysis With Symmetrical Components. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The Graphical User Interface (GUI) provides the user with interactive visual communication to analyze and model the power systems. Applying the advantages of the GUI in Visual Basic operating system, new expert system based software for modeling and analysis of the modem power system network was developed. The software allows the user to draw the single line diagram representing the power system with ratings of each component. It calculates the corresponding per-unit values and the change of impedance of individual component referred to the common system MV A. These per-unit values can be used to draw the reactance diagram of symmetrical components, known as sequence networks, automatically. Applying expert system features, this software is able to reduce these sequence networks looking at fault location in order to obtain equivalent Thevenin impedances. These values is useful in calculating fault data for four typical types of fault, single-line to ground (SLG), line-to-line (LTL), and double-line to ground (DLG) for nonsymmetrical types faults and three-phase (3-P) for symmetrical-type fault. Besides, the software present output data not only in numerical values but also in phasor form. Moreover, it also permit fault analysis been performed using standard bus impedance matrix method. This analysis incorporates transformer phase-shifting effect into account and been carried-out for all buses. It will greatly help practicing engineers and students to visualize the operating conditions of power system subjected to various types of fault.

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