Substation data validation by a local three-phase generalized state estimator

This work presents a framework allowing the huge amount of data currently available at substations to be locally processed and filtered before being transmitted to the energy management system. The proposed approach is based on the application of a three-phase state estimator (SE) at the substation level. In order to check the substation topology, individual switching elements are modeled following the ideas recently introduced by the generalized SE paradigm. Such a detailed model allows in turn the use of many more three-phase sets of measurements, like those provided by the protection system, leading to a significant increase in local redundancy. Achieving this goal is facilitated by exploiting the possibilities offered by the so-called intelligent electronic devices, integrated in modern networked architectures which are becoming common in more and more substations. This way, both analog measurements and positions of switching devices can be locally validated. This paper focuses particularly on new types of measurements which are included in the local SE formulation and presents experimental results showing the potential benefits that can be obtained when the proposed scheme is adopted.