The Best Line Choice for Transmission System Expansion Planning on the Side of the Highest Reliability Level

Abstract This paper presents a new method for making a choice of the best line for transmission system expansion planning on the side of the highest reliability level of transmission system. Conventional methodologies for transmission system expansion planning have been mainly focused on economics, which is minimization ofconstruction cost. However, quantitative evaluation of transmission system reliability is important because successful operation and planning of an electric power system under the deregulated electricity market depends on transmission system reliability management. Therefore, it is expected that the development of methodology in order to choice best lines on side ofthe highest transmission system reliability level considering uncertainties of equipments of transmission system is useful in future. The characteristics and effectiveness of the proposed methodology are illustrated by the case study using a MRBTS.