In-field verification of the real-time distribution state estimation

The State Estimation represents the basic function in both Energy Management System (EMS) and Distribution Management System (DMS), since a lot of power applications in both systems (load flow, fault calculation, relay protection, voltage control, security and loss analysis, etc.) are based on the estimated actual (or studied) state. The state estimation of transmission networks has been established several years ago [1]. The corresponding estimation procedures are founded on the high level of network remote monitoring provided by usual Supervisory Control and Data Acquisition (SCADA) systems. The redundancy of real-time telemetered data about both the network state and topology is usually higher than 2.0. Such a redundancy provides not only a high quality estimation of the network state, but also a high quality dealing with wrong measurements, validation of network parameters and topology.