A Fast and Reliable State Estimation Algorithm for AEP's New Control Center

This paper presents an evaluation of some previously proposed and newly developed state estimation algorithms. One new algorithm, which employs a constant, decoupled gain matrix and certain other simplifying approximations, is shown to be clearly superior to the other methods considered; accordingly this algorithm has been chosen for use in AEP's new control center. The selected algorithm is fast, reliable and can process a measurement set consisting of line flows, bus injections and voltage magnitudes. Test results are given for several real networks and some standard IEEE test systems (having as many as 460 buses and R/X ratios ranging from 0.1 to 2). The network conditions used in the tests range from light load to severe contingencies with low voltages and large phase angles. A wide variety of practical and hypothetical measurement sets are considered.