Energy Function for Power System Stability Assessment

Exhibitor: Woon Keong Ang

Supervisor: Zhao Dong

Research Group: Complex and Intelligent Systems

Industry Sector: Energy and Utilities

Most of the existing power system models designed specify the amount of mechanical power, electrical power, torque, rotor speed of generators, loads and transformer parameters incorporated in the system to calibrate the maximum load flow. There are numerous assumptions made to define the stability of theses system models. One of the method is to use the equal area criterion theory to describe stability. No doubt, these parameters can specify the characteristics of stability, but to enhance and have a more precise prediction of stability in a system, an energy function which define the nature of the system is essential when it exhibits a highly non linear characteristic when there is a severe disturbance or after disturbance.

This thesis investigates the various parameters affecting transient stability and defines an energy function for a power system. It works out a general principle model to decipher stability in a very precise and effective way to calibrate the amount of energy in a system during different rotor angles whilst the system is in post fault or after disturbance.

The main emphasis of this paper illustrates the power system stability, two models for the power system, relatively the single machine system and multi-machine system. A mathematical database was also created to predict the stability of the system using the energy function.

Lastly, it explains how these approaches affect the power system and hopefully provide a more efficient and accurate calibration in power systems.

Thesis Document (PDF)