Dynamic state estimation of an electric power system

An estimator of the dynamic state of an electric power system (EPS) is presented in this paper. The developed algorithm involves two stages which are based on the weighted least square (WLS) technique. The first stage uses conventional measurements (delivered by RTU - SCADA meters) and synchronized phasor measurements (delivered by PMU meters) in order to estimate the state of the system forming an iterative hybrid state estimator (HSE). The second stage uses synchronized phasor measurements and voltage pseudo-measurements obtained from the estimated state on the first stage and the dynamic information delivered from synchronized phasor measurements. This stage runs at PMU speed. The method has been tested on the New England system. Results prove the estimator can accurately estimate the state of a system on dynamic condition in the presence of both slow and fast transient phenomena.