PMU Based Robust Dynamic State Estimation Method for Power Systems

An accurate and dynamically robust state estimator is indispensable for the efficient and reliable operation of a power system. In this paper, a state estimation method based on Phasor Measurement Units (PMUs) is proposed for the real-time monitoring of power systems under various operating conditions. This PMU-based Robust Dynamic State Estimator (PRDSE) makes feasible the combination of historical measurements, obtained from the Supervisory Control And Data Acquisition (SCADA) system, with present more precision measurements obtained from PMUs. A new state accuracy-based weighting function is proposed to increase the robustness when the system encounters a large unwanted disturbance. Several IEEE test systems under normal and dynamic operation conditions are used to demonstrate the high performance of the PRDSE. Numerical results show the effectiveness and robustness of the PRDSE.