Transformation of measurements for using external network equivalents in state estimation

Network reduction techniques are attractive options for the analysis of large, complex power systems. In the process of network reduction, the original measurements usually get transformed along with the network parameters. It is therefore essential to take into account these transformations in applications such as state estimation. This paper presents a methodology for determining the relation between the measurements in the reduced system and the measurements in the original system. State estimation can then be carried out with the help of the transformed measurements. The developed method is applied on the IEEE 14 bus and IEEE 118 bus test systems.