Abstract
In this paper, a new fast decoupled state estimator with equality constraints is proposed. The Langrange multipliers were utilized to deal with the zero injections. The proposed method is based on the equivalent-current-measurement and rectangular coordinates. The conventional assumptions on voltage magnitudes, angles and r/ x ratios are no longer necessary by the new method in decoupling the network. The method uses a compact constant-symmetric gain matrix which can be decoupled into two ‘identical’ sub-gain matrices. The update and factorization of the sub-gain matrix needs to be carried out only once. Tests have shown that the proposed low-storage method is efficient, accurate and robust in solving the equality-constrained state estimation.
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