Implementation of a stability index for power system using energy balance criteria

It is important for transient stability assessment to define a stability index to assure rigorous results and to be as much as closer to the ideally stable condition. Number of indices of stability has been suggested for this purpose using Energy Function. This paper suggests a stability index based on the generator power balance equation, enforced by proper mathematical analysis and simulation results. It is named Improved Rate of Change of Kinetic Energy (IRACKE). This paper also suggests the practical implementation of this stability index to avoid instability. This technique is implemented by suggesting embedding measuring devices inside the generator to record all machine power parameters of power balance equation (Input, output, magnetizing and losses), which seems to be feasible to achieve stability automatically using IRACKE. It is prospected that this implementation is mostly suitable for Wind and Hydro generators because of their small inertias compared to other types of generators. This implementation will transfer the criteria of protection of power network to a new level using online stability assessment.