Abstract
This paper is based on a linear contingency analysis program that computes line flow changes and bus voltage changes resulting from branch outages and generation changes. A modern formulation has been adopted based on the relation V=IZ. For maximum speed in processing large number of contingencies, line (branch) outage distribution factors are computed and stored through separate small program. Besides retrieval of these factors and reading of relevant data, the main program is also capable of calculating these factors using elements of bus impedance matrix (Zbus) and branch impedances. The computer language used for contingency analysis program is BASIC 5.1 codeable on Hewlett Packard computer. The language is very fast, comprehensive and powerful to code scientific programmable instructions and is combination of FORTRAN-77, PASCAL and BASIC P.C. based language. The resulting program processes single to four branch outages at a time for 50 buses WAPDA 'S 500/220 kV primary transmission system for 119 branches along with generation changes at 17 buses for 102 generating units in about 1.89 seconds on a Hewlett Packard Management Computer. 1.2.3
Published Version
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