Voltage dip at maximum angular swing in the context of direct stability analysis (of power systems)

Abstract

A review is provided of the sparse formulation of the transient energy function direct stability method with emphasis placed on the issue of mode-of-disturbance selection. The approximate procedure for maximizing the potential energy margin is presented. This is verified by comparative simulations with time-domain techniques. The variations of worst voltage dips and transient energy margins with fault clearing times are illustrated. An application involving the use of postfault capacitor switching to improve the voltage dip stability margin is described. A simplified voltage dip computational approach is proposed and illustrated. All these developments are used in a specification for a modified direct stability program with voltage dip criteria for stability assessment and enhancement.<>