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Optimal energy design for the secure energy demand coverage of a floating platform - scientific laboratory

Fiorentzi Georgia

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Summary

Hybrid power systems are mainly implemented for the uninterrupted operation of significant systems, in areas where the connection to the network is an economically unviable solution or presents problems (interruptions or voltage fluctuations). A Hybrid Energy System is any autonomous power system, incorporating more than one energy sources that operate together with the necessary supporting equipment, including energy storage, in order to provide electricity to the network or at the point of installation. The use of a dispatchable power output unit is usually considered necessary, as the energy generated by the sun and wind is not enough for every hour of the day, in order to meet the load requirements. This thesis studies the design and the operation of a Hybrid Energy System, in particular a floating platform, which will be constructed north of Heraklion. The floating science laboratory combines renewable energy power plants, a dispatchable power output unit and a battery storage energy system. The simulation has been implemented in HOMER software (Hybrid Optimization Model for Energy Resources), as the aim of this study is to achieve the optimization of the energy system and the maximum energy production with the minimum cost. The initial case that was studied is the autonomous operation of the floating platform, including as main energy sources, wind turbine, photovoltaic modules and a Diesel generator. Subsequently, the autonomous hybrid system was simulated by using Solid Oxide Fuel Cells (SOFCs). All the above simulations were conducted with two different models of wind turbines and two different types of batteries, in order to select the most efficient and suitable combination of elements. In the last case, the floating platform was connected to the central grid, in which case only photovoltaic modules were used. The simulations of all the above combinations were conducted for four load prediction scenarios.Finally all the simulations’ results for the autonomous and grid connected platform are presented, analyzed and compared. In particular, in the case of modeling the platform’s autonomous operation, there are many constraints that have to be taken into consideration. The evaluation of the individual components, in terms of their suitability, cost efficiency and operational lifetime, is an important criterion for selecting the ideal combination of elements, in order to safely meet the energy needs of the floating scientific laboratory.

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