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Analysis of ill-conditioned power-flow problems using voltage stability methodology

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4 Author(s)
Wang, Y. ; Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada ; da Silva, L.C.P. ; Xu, W. ; Zhang, Y.

Ill-conditioned power-flow problems have been widely investigated and reported in the literature. A typical approach develops enhanced solution algorithms when a power-flow case is found divergent with the conventional Newton method. It is known that a genuine ill-conditioned problem is caused by the presence of a large condition number in the power-flow Jacobian matrix. Since a large condition number is associated with small singular values or eigenvalues of a matrix and the voltage collapse is also related to small eigenvalues, it is therefore postulated that an ill-conditioned power-flow problem is actually a voltage collapse problem. The objective of this paper is to investigate the relationship between power-flow ill-conditioning and voltage instability. The findings confirm that power-flow ill-conditioning only occurs at the voltage collapse point. As a result. Developing improved algorithms to solve the problem is an unprofitable strategy. The well-known voltage stability assessment techniques such as the PV curve method are sufficient for the problem. This conclusion is supported with case studies on five widely known ill-conditioned power-flow problems and rigorous mathematical analysis

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Generation, Transmission and Distribution, IEE Proceedings-  (Volume:148 ,  Issue: 5 )