Now showing items 1-10 of 10

  • Agent-based Optimization to Estimate Nash Equilibrium in Power Markets 

    Authors:Yucekaya, Ahmet; Valenzuela, Jorge
    Publisher and Date:(Taylor & Francis Inc, 2013)
    In most deregulated power markets firms bid daily into a day-ahead power market. The auction mechanism supply and demand determine the equilibrium at each hour. In this environment firms aim to maximize their revenues by carefully determining their bids. This requires the development of effective computational methods that help them estimate their competitors' behaviors under incomplete information. In this article an agent-based method that uses particle swarm optimization is described to simulate ...

  • Bidding of price taker power generators in the deregulated Turkish power market 

    Authors:Yucekaya, Ahmet
    Publisher and Date:(Pergamon-Elsevier Science Ltd, 2013)
    In deregulated power markets power firms bid into the day-ahead power market either with buy offers or sell offers. The auction mechanism and competition determine the equilibrium price and quantity for each hour. If the bid price of a company is below the market clearing price then the offer of the company is accepted and rewarded with the market price. A company can be a price maker or price taker depending on the capacity it offers to the market. A price-taker unit must determine the right offer ...

  • Forecasting electricity demand for Turkey: Modeling periodic variations and demand segregation 

    In deregulated electricity markets the independent system operator (ISO) oversees the power system and manages the supply and demand balancing process. In a typical day the ISO announces the electricity demand forecast for the next day and gives participants an option to prepare offers to meet the demand. In order to have a reliable power system and successful market operation it is crucial to estimate the electricity demand accurately. In this paper we develop an hourly demand forecasting method ...

  • Landfill Gas to the Energy Potential of Turkey: A Scenario-based Multi-period Simulation 

    Authors:Yucekaya, Ahmet
    Publisher and Date:(Taylor & Francis Inc, 2013)
    Turkey is a developing country with increasing power demands and limited energy sources. Municipal solid waste processing landfilling and utilization of the gas to generate electric power and lower emissions has been used in developed countries for decades however it is relatively new in Turkey. The new regulations force municipalities in the country to build landfills to safely store the waste and secure the emission gases. The landfill gas can be utilized to produce energy and heat or if the ...

  • Managing Fuel Coal Supply Chains With Multiple Objectives and Multimode Transportation 

    Authors:Yucekaya, Ahmet
    Publisher and Date:(AMER SOC ENGINEERING MANAGEMENT, 2013)
    Power companies require sophisticated tools to manage fuel-coal supply chains which include multiple suppliers coal contracts and multimode transportation routes. In this article a multi-objective model which is integrated with multi-attribute decision-making for the selection of suppliers transportation routes and coal orders is developed. The model simultaneously optimizes multiple objectives such as minimizing purchase costs transportation costs and ash output and it also presents a decision ...

  • Multi-objective Fuel Supply for Coal-fired Power Plants Under Emission Transportation and Operational Constraints 

    Authors:Yucekaya, Ahmet
    Publisher and Date:(Taylor & Francis Inc, 2013)
    Coal-fired power plants need to decrease their generation cost in deregulated power markets so as to be selected dispatched and compete with other cheaper resources. On the other hand coal prices have risen significantly and extra costs for SO2 and NOx emission outputs are imposed that force power companies to lower the costs for the fuel-coal supply process. In this article a multi-objective model for supplier transportation and coal order selection is developed for the coal supply of electric ...

  • Nutrient Dynamics in Flooded Wetlands. I: Model Development 

    Wetlands are rich ecosystems recognized for ameliorating floods improving water quality and providing other ecosystem benefits. This part of a two-paper series presents a relatively detailed process-based model for nitrogen and phosphorus retention cycling and removal in flooded wetlands. The model captures salient features of nutrient dynamics and accounts for complex interactions among various physical biogeochemical and physiological processes. The model simulates oxygen dynamics and the impact ...

  • Nutrient Dynamics in Flooded Wetlands. II: Model Application 

    In this paper the authors applied and evaluated the wetland nutrient model that was described in Paper I. Hydrologic and water quality data from a small restored wetland located on Kent Island Maryland which is part of the Delmarva Peninsula on the eastern shores of the Chesapeake Bay was used for this purpose. The model was assessed through various methods against the observed data in simulating nitrogen (N) phosphorus (P) and total suspended sediment (TSS) dynamics. Time series plots of observed ...

  • A probabilistic model to maximize cross-selling revenues in financial institutions 

    Authors:Altun, Yasin
    Publisher and Date:(Kadir Has University, 2016)
    Alongside earns transaction volume and transaction number goals banks also have cross selling rate aims in recent years. Also again many banks of our day have studies on transaction cost and calculate costs for every single transaction without missing any and take this information into account while calculating the actual profitability of customer. We searched which product could be sold to customer in this process. While doing this we took the cost of offer into consideration and try to maximize ...

  • The operational economics of compressed air energy storage systems under uncertainty 

    Authors:Yucekaya, Ahmet
    Publisher and Date:(Pergamon-Elsevier Science Ltd, 2013)
    A Compressed Air Energy Storage System is a means of storing energy which can then be used when the demand for energy increases. In this system air is compressed in a cavern when power prices are low and this air is used to run a natural gas-fired turbine to generate power when prices go up with the aim of profiting from the price difference. This type of system can independently compress air generate electricity or do both. However the prices of electricity and natural gas fluctuate which directly ...