송전계통의 확률론적 신뢰도 평가에 관한 연구
(A) Study on probabilistic reliability evaluation of transmission system
송전계통 신뢰도평가 전기공학;
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The primary function of an electric power system is to provide electrical energy to its customers as economically as possible and with an acceptable degree of continuity and quality. Modern society, because of its pattern of social and working habits, has come to expect the supply to be continuously available on demand. But this is not physically possible in reality due to the random system failures which are generally outside the control of power system engineers. Bulk transmission system reliability is an important consideration in system planning and operating. In the past, electric utilities were continuously adding more facilities to their systems in order to satisfy the growing customer energy requirements. In most cases, the systems were over built resulting in higher electricity rates for customers. The reliability evaluation of transmission system is being realized to play an important role in the electric power systems under the situation of the deregulation, because the electricity transmission system will be planned, operated and maintained by an independent transmission administrator in the new electric industry. And the successful operation under the deregulated electricity market depends on transmission system reliability management. A quantitative evaluation of transmission system reliability is a more important issue than it ever was. Specially, the nodal reliability indices can be used valuably for management and control of congestion and reliability of transmission system under deregulated electricity market. This paper presents a method for making a choice of the best line for transmission system expansion planning on the side of the highest reliability level Quantitative evaluation of transmission system reliability is very important because successful operation of an electric power system in the deregulated electricity market depends on transmission system reliability management. The key point is that the reliability level of the transmission system is equal to the reliability level difference between the composite power system (HLII) and the generation system (HLI). Risk indices of a composite power systems are larger than those of the generation system as the composite power systems includes uncertainties and capacity limits of the transmission lines. The characteristics and effectiveness of this methodology are illustrated by the case study using a MRBTS.