Two-Level State Estimation for Multi-Area Power System

This paper presents a two-level state estimator for multi-area interconnected power system. In the first level of the algorithm, each area runs their own state estimator using the measurements obtained from its own area. In the second level of the algorithm, the central coordinator collects the state estimation results from the individual areas and coordinates them to get the multi-area state estimation with respect to a global reference. The use of measurements from synchronized phasor measurement units along with conventional measurements from the boundary network is justified and implemented to increase the accuracy of the two-level state estimator. The algorithm is implemented on the IEEE 30-bus and a 1896-bus real world system.