الفهرس 
power system reliability an introductionOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
Development of reliability assessment techniques and programs is very important in power system planning and in testing of existing power network configurations for detecting its weak points. The development and utilization of a reliability program are greatly influenced by experience of a utility and the intent of the system manager, planner and designer conducting the reliability studies .The reliability studies of bulk power systems indicate the ability of the composite generation and transmission system to satisfy the load demand at major load points. Considerable effort has been done over the three last decades to develop techniques and criteria for adequacy evaluation of composite power systems. A major burden in the developed methods used in evaluation of large composite system reliability is the computation time required to solve a large number of credible contingencies or outage states.
The aim of the present thesis is to introduce a novel approach capable of solving real large size networks reliability problems using normal size computers. This approach is used in the field of bulk generation and transmission reliability evaluation. It is an additional effort to calculate the reliability indices at individual load buses and reliability of the whole system. The role of loading factor between loads is also introduced and studied. Its effect on reliability is investigated.
The loss of load probability (LOLP) is taken as a measure of the reliability index in this evaluation .The approach is based on the minimal path set and dual fault tree techniques. This approach shows that the study of loading conditions is essential in the evaluation of reliability, since it determines the direction of the power flow in every element of the system .. The proposed approach is expanded to calculate the reliability of composite generation and transmission system taking the following constraints into consideration.
Amount of reliability of system generation.
Amount of reliability of transmission lines. Maximum system generation capacity. Maximum transmission lines capacity. Maximum connected load at each bus.
Also, comparison is done between the proposed method and the previous methods and the difference between all methods are discussed. It was found that the proposed method is more accurate and precise with respect to some other techniques. A new concept is introduced in the thesis, which is defined as ”constant reliability region”. This concept is utilized in the field of optimum operation of power networks. The thesis develops a new special program, which helps in reliability calculations throughout the research. The suggested approach combines loading conditions with reliability assessment and provides a useful loading guide regarding system reliability