On-line overhead transmission line And transformer parameters identification based on PMU measurements

Knowledge of the actual values of power system components parameters represents essential input for real time applications. In this regard, this paper presents a method for estimating transmission line and transformer parameters based on phasor measurement units (PMU) installed at both ends of the network components. Transmission line parameters are essential inputs for various applications such as state estimation of power systems and protective relaying applications. Furthermore, the line length, temperature and sag can be used in dynamic thermal line rating algorithms for increased power transfer capacity. In addition, this paper presents an algorithm for estimating the actual values of electric and catalog parameters for power transformers, since it is known that they are changing in time. Numerical examples and preliminary results are presented.