WIT Press

Electromagnetic Transients Modeling In Power Systems Using The Finite Element Technique


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I. Juric-Grgic, R. Lucic & M. Kurtovic


This paper presents a new method when modeling electromagnetic transients in a power system in the time domain, based on the finite element technique. Each element of the power system under consideration, such as the synchronous generator, transformer, transmission line, circuit breaker, etc. is modeled as a finite element. In the case of a large power system the size of the problem can be effectively reduced using a special finite element obtained by the Thevenin equivalent. With such an approach, elegant modeling of transient behavior of a power system can be carried out. 1 Introduction Electromagnetic transients analysis is the essential part of power system analysis in order to predict power system behavior under sudden changes. At this moment there are several numerical methods [1], which are used to do power system analysis. Question is, is there any need for the new one? In our opinion, the answer is affirmative, especially if it is possible to make such algorithm, which will be effective, simple and versatile. The concept of the finite element technique up to now used for electromagnetic field problems can be used in power system analysis. Electrical network with lumped and distributive parameters can be considered as a set of "finite elements" [2]. Consequently, each part of electric power system such as generator, transformer transmission line, load etc. can be considered as a "finite elements". Differential equations describing each element of power system (generator, transformer transmission line, load etc.) using appropriate procedure (theta method as a natural generalization of the backward difference, mid-difference