In Italy during the last years the number of energy plants based on combined cycles has noticeably grown due to the improvement of thermal performances. Originally this technology was thought for a continuous operation, but today a more and more flexible use is suitable because of the strong impact of the cost of natural gas as well as of the market price of electrical energy. This work, lying on a techno-economic analysis, aims to assess the most convenient operation policy of a typical 380 MWel plant during a 20 years lifecycle in the liberalized market. Two different management strategies are considered. The first one and more adopted at present prescribes minimum load operation whenever costs exceed gains for a period greater than 18 hours, otherwise the plant is stopped. The second one designs a very flexible operation policy such that the plant is stopped if economic drawback arises for more than 8 hours. Results put in evidence that relevant benefits are achieved only adopting the second strategy. Moreover the interest for a more flexible plant management is also supported by the expected increase of the value of CO2 emission shares according to the Emission Trading forecast presented in WEO 2009.
VALUTAZIONE DI STRATEGIE DI ESERCIZIO FLESSIBILE PER CICLI COMBINATI
COLOMBO, LUIGI PIETRO MARIA;
2010-01-01
Abstract
In Italy during the last years the number of energy plants based on combined cycles has noticeably grown due to the improvement of thermal performances. Originally this technology was thought for a continuous operation, but today a more and more flexible use is suitable because of the strong impact of the cost of natural gas as well as of the market price of electrical energy. This work, lying on a techno-economic analysis, aims to assess the most convenient operation policy of a typical 380 MWel plant during a 20 years lifecycle in the liberalized market. Two different management strategies are considered. The first one and more adopted at present prescribes minimum load operation whenever costs exceed gains for a period greater than 18 hours, otherwise the plant is stopped. The second one designs a very flexible operation policy such that the plant is stopped if economic drawback arises for more than 8 hours. Results put in evidence that relevant benefits are achieved only adopting the second strategy. Moreover the interest for a more flexible plant management is also supported by the expected increase of the value of CO2 emission shares according to the Emission Trading forecast presented in WEO 2009.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
