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RELIABILITY EVALUATION OF COMPOSITE GENERATION AND TRANSMISSION SYSTEMS

Date

1978-12

Journal Title

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Type

Degree Level

Doctoral

Abstract

The problem of composite generation and transmission system reliability evaluation is now receiving considerable attention as utilities are finding it necessary to quantitatively evaluate individual load point and overall system reliability indices. This thesis extends the available techniques for composite generation and transmission system reliability evaluation to calculate bus and system indices by including line overload alleviation and common mode outages in the analysis. A new set of indices in addition to those presently available are defined and evaluated for an adequate assessment of a composite system. Computationally fast digital computer programs which examine all first and second order simultaneous independent outage combinations of generating units and transmission lines have been developed. Effects of various factors on calculated reliability indices are illustrated using various test systems. Overload of transmission lines is one of the problems encountered in network reliability evaluation. Two computationally efficient line overload alleviation techniques suitable for composite system reliability evaluation and for use in conjunction with the Newton-Raphson and decoupled load flow techniques are described. Additional sets of bus and system indices based upon load curtailment necessary for alleviating line overloads are also defined. The effectiveness of line overload alleviation techniques for evaluating more accurate bus and system reliability indices is demonstrated. A common mode or common-cause outage is an event having a single external cause with multiple failure effects where the effects are not consequences of each other. Several possible common-cause outage models are analyzed in. this thesis. The effect of common-cause outages on reliability indices is also discussed using three test system studies. The impact of system peak load variation and system modifications on bus and system indices are also examined with reference to a 30-bus model of the Saskatchewan Power Corporation System.

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Citation

Degree

Doctor of Philosophy (Ph.D.)

Department

Electrical Engineering

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