Indices for use in composite generation and transmission system adequacy evaluation

Abstract

The adequacy of a composite power system involving both generation and transmission components can be expressed by computing a set of appropriate indices for both the individual load points and the entire system. A wide range of indices have been proposed in adequacy studies by power utilities, research organizations and educational institutions. The selection and definition of these indices are very dependent upon the intent behind the studies and the methodologies used. The absence of a uniform set of meaningful indices is a significant obstacle in any comparison of the different methodologies used for adequacy evaluation. This paper describes a set of load point and system indices that can be used in adequacy studies. These indices have been computed using the COMREL program developed at the University of Saskatchevan. The application of the indices using COMREL is illustrated by evaluating the adequacy of a small test system. The indices proposed and illustrated in this paper provide a basic framework for quantitatively assessing the adequacy of a composite generation and transmission system. It is expected that the indices presented in this paper will make a major contribution to the development of a standard set of overall system adequacy indices.