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A mixed pivoting approach to the factorization of indefinite matrices in power system state estimation

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3 Author(s)
Machado, P.A. ; CEPEL, Rio de Janeiro, Brazil ; Azevedo, G.P.D. ; Monticelli, A.J.

A robust and efficient sparsity oriented approach to the factorization of indefinite matrices that appear in connection with a variety of power system state estimation formulations is presented. Particularly, the problem of representing zero injections as equality constraints in the normal equation formulation is discussed and analyzed. A new ordering scheme for mixed 1×1, 2×2 pivoting is proposed and tested. Tests on two real life systems (41 buses and 1331 buses) are reported and discussed

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Power Systems, IEEE Transactions on  (Volume:6 ,  Issue: 2 )