Synchrophasor Based Three-Phase State Estimator

State estimation is the core of the Energy Management System (EMS) and plays very significant role in continuous monitoring of the electric power systems. Dynamic State Estimator (DSE) facilitates the real time awareness of power system by providing real-time states of the system. Generally used estimation models are single phase, and based on some basic assumptions (i. e. balanced operating conditions) that mask natural behavior of power system. This paper focuses on the three phase-state estimation, and consider system imbalance while estimation of system states. Phasor measurement units (PMUs) provide synchronized measurements that make estimation problem linear in case of complete observability of system. Transmission system under unbalanced and widely varying operating conditions may also fail to hold its present balanced characteristics. IEEE 14 bus and New England 39 bus system have been used for test purpose.