時間帯別料金制下における電力託送を含めたコジェネ自家発の最適挙動

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  • The Optimal Behavior of Co-generation with and without Wheeling under Time-of-Use-Pricing
  • ジカンタイベツ リョウキンセイカ ニ オケル デンリョク タクソウ オ フクメ

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Authors already developed a model which describes the behavior of co-generator with and without wheeling. Wheeling enables co-generators to send electricity produced by them to remote customers through the transmission lines of utility companies. In the previous study, we theoretically analyzed its optimal behavior from the viewpoint of maximizing the co-generator's benefit and numerically evaluated the effects of wheeling on the energy efficiency. In this study the model is expanded so as to investigate its behavior under time-of-use-pricing of electricity. While the previous model is of a single time period, new model has two periods, i.e. peak and off-peak periods. It is interesting to model and analyze the behavior of co-generator under time-of-use-pricing because some modes of operating co-generation depend upon the price of each period.<br> Expanded criterion of the behavior under time-of-use-pricing is formulated and optimized analytically based on the Kuhn-Tucker condition. The condition under which wheeling occurs and that under which electricity is purchased are also clarified. In comparison with the behavior of auto-producers which supply only electric power, co-generator expands the range in operation with respect to time-of-use-pricing. The impacts of wheeling on the energy efficiency estimated in numerical examples imply that it is socially beneficial because it increases the efficiency of the system with co-generation plants.

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