The Efficient Search Method for High Risk Events of Power Systems Caused by Natural Disasters

Power systems become large and complex, so the occurrence rates of a great deal of energy loss caused by faults become high. In this situation, the development of the efficient search method for high risk events of power systems is strongly required. Risk is defined as the product of energy loss and its occurrence rate, considering that the goal of power systems is the stable supply of power. This paper presents the developed method which can search accurately and efficiently high risk events of power systems resulted from the loss of transient stability caused by natural disasters. It was applied to the model system composed of 3 generators and 9 buses. The results of application have clarified its effectiveness. Key-Words: Power Systems, Transient Stability, Risk, Natural Disasters, Critical Fault Clearing Time