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– This paper attempts to evaluate the impact of power plant penetration on constraints of a transmission network and proposes a methodology based on risk level, which can evaluate the condition of the network and facilities intuitionally. Furthermore, based on this methodology, RLII(Risk Level Improvement Index) is proposed in order to establish comprehensive TNEP(Transmission Network Expansion Planning) from a viewpoint of ISO(Independent System Operator). In order to verify the proposed methods in this paper, real power systems in Incheon and Shiheung areas, south Korea are applied to the case study.Key Words : Transmission network expansion planning, Risk level improvement index, Risk level assessment*Dept. of Energy Engineering, Keimyung University, KoreaE-mail : energy@kmu.ac.kr Received : February 17, 2014; Accepted : May 17, 2014 1.    ,   ,                  . ,       ,       . ,                   . ,        ,    [1-4].  , , , ,   , ,        ,             ,       ,       . ,        ,                [5].  ,         ,       (LP: Linear Programming),  (DP: Dynamic Programming),   (MIP: Mixed Integer Programming)     [6-11].                 ,                [12]. ,        .  ,           .           ,              .        ,      ,                    . ,     ,      ,      .

Transmission Network Expansion Planning Using Risk Level Improvement Index