Wind-Hydrogen Hybrid System

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Supervisor:
Dr. Hunyár Mátyás
Department of Electric Power Engineering

In this paper a wind-hydrogen hybrid system will be analized. The intermittency of renewable energy sources, such as the wind, makes their implementation hard in the distribution network and according to this unable to follow the costumers' demands. The part time availability makes the output power difficult to predict and consequently lowers the value of wind-electricity. With temporary, buffer storage constant output power could be fed in the distribution system, due to storage capacity optimalization, in addition to this the the operatior of the windfarm can fulfill the output schedule so that the penalties due to schedule discrepancies are lowered, the sudden drop of output power is also eliminated issue. This work investigates the benefits of utilization of buffer storage in the form of hydrogen. The hiydrogen production with renewable wind is justified as long as the prices and the exploitation of fossil fuels are rising, furthermore the dependency of national economies from fossil fuel raises doubt regarding the future of these nations. In this thesis, the examined system consists of a 16 MW windpark which feeds the network and with it's surplus electricity supplies a 420 kVA electrolyser. The alcaline type electrolyser produces hydrogen which is cleaned, fed and compressed to 200 bar gas hydrogen tank. When the costumers demand arises a 150 kW PEM fuel cell stack consumes the hydrogen and pumps electricity in the network. The work studies the operation, type, efficiency and the adaptation parameters of the individual parts of the system. PEM fuel cells are investigated more thoroughly, through its describing equation, the polarisation curve and as the accomplishment of the chapter a simulation with Matlab Simulink will be carried out. The different states of the system in the aspect of network integration and stability is also examined. The final chapter investigates an implementation of the model with all available on market units, extended to costs as well. Through the model building the capacity of the hydrogen tank to satisfy a previously attained schedule of output power is also estimated.

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