IMPLEMENTATION OF PROBABILISTIC TECHNIQUES IN TRANSIENT STABILITY STUDIES
Date
1985-03
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ORCID
Type
Degree Level
Masters
Abstract
Stability studies have become an essential part of power system planning, design, control and operation. Two types of stability studies are generally considered, namely, steady-state stability studies and transient stability studies. This thesis deals with transient stability only. A transient stability study is concerned with the effect of a large or sudden disturbance on a system and the ability of the system to handle such perturbations. It has been observed that factors such as fault types, fault locations, fault clearing schemes, system parameters and initial operating conditions greatly affect the transient performance of a system. A number of these factors are probabilistic in nature. The probabilities of the occurrence of these factors vary from one system to another and depend on the weather condition. Transient stability studies are presently normally conducted in a deterministic manner. A "worst-case" contingency is introduced to the system and the system is investigated for its transient performance. The result obtained using this approach is generally conservative and ignores the probabilistic aspects of the problem. It is therefore necessary to include the probabilities associated with these factors in order to obtain a more realistic appraisal of system security. An
index, called the "Probability of Stability" was proposed by Billinton and Kuruganty which illustrates the margin and profile of the system stability. This is the probability that the system disturbance will be removed within the critical clearing time.
This thesis describes the implementation of the concept proposed by Billinton and Kuruganty into a compact framework. The digital computer program developed is a self—contained, integrated program which takes into account different possible contingencies and their corresponding probabilities. The results are displayed in both tabular and graphical forms. Some of the system parameters can be changed interactively to perform sensitivity studies. The system can be investigated in part or entirely. The result is a set of indices which indicate the transient performance of a system. The program was tested by investigating two multi—machine systems, one an 8—bus system and the other a 42—bus Saskatchewan Power Corporation equivalent system. The sentivities of these indices to some of the factors are investigated and are presented in this thesis.
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Degree
Master of Science (M.Sc.)
Department
Electrical Engineering