Paul H. Haley

Super Decoupled Loadflow With Distributed Slack Bus

The algorithm presented here achieves better decoupling of the Load flow equations for networks having branch elements with low X/R ratios. It does this by applying unitary (rotation) operators to the complex bus injections and the complex bus voltages. This simple modification to Stott & Alsacs [1] Fast Decoupled Loadflow (FDLF), along with the: implementation of a distributed slack bus, yields a robust and fast algorithm for loadflow problems involving large networks. Tests show that the algorithm can be more than twice as fast as FDLF.

Bad Data Groups in Power System State Estimation

A problem in Power System State Estimation is the detection of Bad Data Groups. These are groups of measurements topologically related so that their normalized residuals are always equal (or nearly so). In this paper we derive numerical and topological methods to identify Bad Data Groups and include simulation and real time test results for the proposed methods.