DECOUPLED RANKING OF BRANCH OUTAGES CAUSING LIMIT VIOLATIONS

ABSTRACT

This paper describes a decoupled method for ranking contingencies based on voltage deviation, overload and reactive power limit violation performance indices. It is based on non-iterative compensation technique. A novel method of secondary injections at voltage controlled buses (including slack) to maintain their voltages constant and secondary injections at slack bus to maintain its angle constant has been developed. Results for four sample test systems have been obtained to test the effectiveness of the method. The rankings obtained by the new method are in good agreement with those generated by rigorous A.C. load flow solutions for all the test systems investigated.