Abstract
A new approach for the state estimation of large-scale electric power systems is proposed. It consists in decomposing the overall system into subsystems and in performing a two-level calculation. In the lower hierarchical level, a conventional state estimation is carried out simultaneously but independently for all subsystems. These local estimations are then coordinated at the second hierarchical level which, by this means, receives and treats only a small number of variables. The potential advantages of this hierarchical procedure over the standard ‘integrated’ method include smaller subsystem state estimators, less transmitted information, higher reliability, easier bad data detection-identification, and shorter computing time.
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