Reliability Evaluation in Electric Power Systems
In this seminar, the reliability evaluation of an electric power system will be outlined, following a review of the fundamental concepts and basic techniques used in the reliability engineering.
Electric power systems are considered to be continuously operated systems which are repairable. One definition of power system reliability given in the literature is “the ability to provide an adequate supply of electrical energy”. The term reliability has a very wide range of meanings and cannot be associated with a single specific definition. Reliability assessment of an electric power system is divided into two basic aspects: system adequacy and system security. Adequacy relates to the ability of installed generation and transmission facilities to serve the total system-load requirements. This includes the facilities necessary to generate sufficient energy and the related transmission and distribution facilities required to transport the energy actual load points. On the other hand, security relates to the ability of the system to respond to the disturbances arising within the system .
The reliability studies of a power system are conducted individually in three basic functional zones: generation, transmission, and distribution. These functional zones can be combined to form a series of hierarchical levels. In this study, we placed the emphasis on hierarchical level two (HL II) including both generation and transmission facilities. Reliability analysis at this level is usually termed “composite system or bulk transmission system reliability evaluation. HL II studies can be performed to assess the adequacy of an existing or proposed system including the impact of various reinforcement alternatives at both the generation and transmission levels. In HL II analysis, it is necessary to consider many complications, such as overload effects, voltages violations, redispatch of generation and the independent, dependent, common cause and station-associated outages. Evaluation of reliability indices at this level involves specification of probabilistic system states to be analyzed.
Ramazan Çağlar is an Assistant Professor in the Electrical Engineering Department of the Faculty of Electrical & Electronics Engineering at Istanbul Technical University. He received his B.S., M.Sc. and Ph.D. degrees in electrical engineering from Istanbul Technical University (ITU), Istanbul, Turkey in 1983, 1987 and 1999, respectively. He has worked as a research scholar and visiting professor at the School of Electrical and Computer Engineering, in Georgia Institute of Technology between 2001 and 2003. His research interests are:electric power system modeling and analysis, probabilistic methods in power system, power system reliability, electric power quality, fault diagnosis and risk management, electric power system deregulation and electricity market. He is a member of IEEE and a member of National Chamber of Turkish Electrical Engineering.