Basic Concepts of Power System Reliability Evaluation

The term reliability has a very wide range of meaning and cannot be associated with a single specific definition such as that often used in the missionoriented sense.(1) It is therefore necessary to recognize this fact and to use the term to indicate, in a general rather than a specific sense, the overall ability of the system to perform its function. Power system reliability assessment can therefore be divided into the two basic aspects of system adequacy and system security as shown in Figure 2.1.