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Utilization of realistic pumped hydroelectric storage system model for various optimal short term control strategies

Üstündağ, Oğuzhan
Due to ecological problems that we are facing, renewable energy sources, such as wind and solar, are emerging trends. However, unless renewable energy is supported by storage systems, the reliability of supply may decrease because of its intermittent and uncertain nature. Besides, since the generation is not controllable without the storage, profitability in the energy market may be risky. In this context, pumped hydroelectric storage systems are the most common and mature way of store electrical energy in grid level. In this thesis, Gökçekaya pumped storage power plant, whose feasibility study has been completed by Japan International Cooperation Agency-JICA, has been modeled. The model is discretized to take water level changes into account and piecewise linearized to consider efficiency alterations. Wind generation and market price data are obtained from Energy Exchange Istanbul-EXIST Transparency Platform. Optimization problem is constructed using mixed integer linear programming method with AMPL Language. Problems are solved in NEOS Servers by using CPLEX as a solver. For the short term, a combination of objective functions, fluctuated generation minimization and profit maximization, have been studied. A small pump unit has been included to the system in order to observe its effects. Operation of each problem has been demonstrated by plotting its results for three consecutive days. Then, one month results are analyzed for January and August. It is found that the small pump unit enhances the operation of the system for all problems. Besides, it is concluded that due to fluctuated electricity market prices, working in January becomes more profitable.