USE OF INCREMENTAL ENERGY COSTS AND LOADING ORDERnRULES IN THE ORSIM PROCEDURE FOR MIDRANGE OPTIMIZATION OF ELECTRIC UTILITY OPERATIONS

摘要

This report describes the conceptual and analytical basis of ORSIM, a computer program for simulating the generation, maintenance, and refueling strategies of an electric utility system over a period of approximately five years. The report is intended to supplement a user's manual for the computer program. Starting with the basic objective of minimizing the total present-worthed cost of electricity production over the planning period, a set of rules is derived for simulating the loading of nuclear, fossil, and hydro units. These merit order rules are developed from consistent definitions of discounted incre¬mental costs of energy from each unit. Modifications of these basic economic merit order rules to account for special operating constraints on the units are discussed;also, the applicability of the rules to the probabilistic model used in ORSIM for treating unit forced outages is demonstrated.