NEW TECHNIQUES TO SPEED-UP VOLTAGE COLLAPSE COMPUTATIONS USING TANGENT VECTORS

This paper discusses various methods based on network partitioning and voltage stability indices to accelerate the computation of voltage co llapse points using continuation techniques. Partitioning methods deri ved from right eigenvector and tangent vector information are thorough ly studied, identifying limitations and probable a mixed partition-red uction technique is then proposed to reduce computational burden. Also , tangent vectors are used to define a clustering method for the ident ification at any operating condition of the critical area at the colla pse point, and. a new voltage stability index is defined based on the identification of this critical area. Finally, a predictor-corrector m ethodology based on this index and the continuation method is proposed for fast computations of voltage collapse points. All the different m ethods are compared based on the results obtained for the IEEE 300-bus test system, and a methodology is recommended based on its prospectiv e computational savings.