SECURITY EVALUATION OF POWER SYSTEMS
Date
1988-02
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Type
Degree Level
Doctoral
Abstract
This thesis deals with security analysis of power systems. The thesis proposes procedures for the simulation of equipment outages, for the evaluation of the relative severity of various system contingencies, and for the determination of appropriate means of alleviating the serious effects of these outages. In the outage simulation technique, a subsystem comprising a specified tier of buses in the neighborhood of the outage is used to simulate an outage. The sensitivity matrix obtained from the base case load flow is used to calculate the post outage state of the subsystem. The line on outage is then replaced by its equivalent real and reactive power injections to calculate the post outage state of the equipment elements outside the subsystem. A comparison of the sensitivity and refactorization techniques is also performed. A voltage performance index capable of detecting voltage violations 'and large voltage deviations is proposed. These techniques are adapted for contingency selection. These techniques are compared with others using the proposed performance index. Two techniques of alleviating voltage and reactive power injection violations are developed. The first technique adjusts the voltage magnitudes of generator buses in the system, while in the second, the voltage magnitudes of generator buses, autotransformer tap settings and reactive compensators in a specified subsystem, in the neighborhood of the violation, are adjusted. The sensitivity technique, and the power injection along with the economic dispatch techniques are used for line overload alleviations.
These techniques are applied to the 14-bus and 118-bus IEEE test systems, the 26-bus model of the Saskatchewan Power Corporation transmission network, and the 231-bus model of the Saskatchewan-Manitoba interconnected networks.
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Degree
Doctor of Philosophy (Ph.D.)
Department
Electrical Engineering