The availability of Phasor Measurement Units (PMU) improves the accuracy and redundancy of existing state estimators as direct measurements of phasor angles are extracted from the synchronization of PMUs across the system

The paper proposes a novel multi-area state estimator based on wide area measurements where only boundary buses are considered in the coordination level. The power injection measurements are not used during the coordination level reducing the number of states and therefore size of the problem. Instead, a set of pseudo-measurements are included whenever a power injection measurement is available in boundary buses. The proposed method was validated using the IEEE 300 bus system split into 7 different areas.