Steady State Instability: Simplified Studies In Multimachine Power Systems

Steady State instabilities cause problems in electrical power systems all over the world. Most of the time critical conditions have been undetected by planning and operational studies since the cost of studying the stability of all potential operational conditions becomes prohibitively expensive for large multimachine power systems. This paper shows how classical concepts and techniques can be used in simplified analysis of these systems. Synchronizing and damping torques are formulated in a simple matrix form that permits the exploration of system characteristics and weaknesses. A European power system is used as an example to show the qualities of the proposed techniques.