Probabilistic Evaluation of Substation Criticality Based on Static and Dynamic System Performances

In most practical cases, traditional methods for assessing the reliability of substations, separately from the electric power network, are not sufficient to a good understanding of the system performance and possible reinforcements. This paper presents a new methodology to evaluate the criticality of electrical substations taking into account their possible operating states, associate probabilities, and consequences on the static and dynamic performance of the electric power system. Two complementary reliability indices are proposed to express the dynamic security and static adequacy levels that a substation provides to the power grid. An application in a test system is presented and the substation criticality ranking is provided and discussed.