Determination of A Deterministic Reliability Criterion for Composite Power System Expansion Planning

The optimal design of composite power system expansion planning is proposed in this paper. One of main keys of the successful power system expansion planning comes from optimal reliability level/criteria decision, which should be given for a constraint in the optimal expansion problem. However, it's difficult to decide logically the optimal reliability criteria of a transmission system as well as generation system expansion planning in a society. This paper approaches a methodology for deciding the optimal reliability criteria for an optimal power system expansion planning considering together generation and transmission systems. A deterministic reliability criteria, DMR(Delivery Marginal Rate) is used in this study. The optimal reliability criteria, DMR*, is decided at minimum cost point of total cost curve which is the sum of the utility cost associated with construction cost and the customer outage cost associated with supply interruptions for load considering bus reserve rate at load buses in long term forecasting. The characteristics and effectiveness of this methodology are illustrated by the case study using Korea power system.