Probabilistic analysis of power system small signal stability region

With the deregulation of power industry in many countries, the traditionally vertically integrated power systems have been experiencing dramatic changes leading to competitive electricity markets. Power system planning in such an environment are now facing increasing requirements and challenges because of the deregulation. The traditional deterministic power system analyses techniques have been found in many cases have limited capability to reveal the increasing uncertainties in today´s power systems. The power system operation and planning are demonstrating probabilistic characteristics which requires emphasizes on probabilistic techniques. A key probabilistic power system analysis technique is the probabilistic power system small signal stability assessment technique. With the many factors such as demand uncertainty, market price elasticity and unexpected system congestions, it is more appropriate to have probabilistic power system stability assessment results rather than a deterministic one especially for the sake of risk management in a competitive electricity market. We present a framework of probabilistic power system small signal stability assessment technique in this paper supported with detailed probabilistic analysis and case studies. The results of this paper can be used as a valuable reference for utility power system small signal stability assessment probabilistically and reliably.