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Design and simulation of the operation of an autonomous hybrid power systemusing renewable energy sources and hydrogen fuel cells

Dinopoulou Vaia

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Year 2017
Type of Item Diploma Work
Bibliographic Citation Vaia Dinopoulou, "Design and simulation of the operation of an autonomous hybrid power system using renewable energy sources and hydrogen fuel cells", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2017
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Renewable energy sources are forms of usable energy from various natural processes. Important factors such as the dependence on fossil fuels such as oil as demand for electricity is increasing and these resources are gradually depleted, as well as addressing serious environmental problems caused by the release of harmful gases and waste into both air and waters, have led the global economies to shift to renewable energy sources. A Hybrid Energy System is any autonomous power system, incorporating more than one energy sources that work together with the necessary supporting equipment, including energy storage, in order to provide electricity to the network or at the point of installation.This thesis deals with the development of a dynamic model that simulates the operation of an autonomous hybrid plant RES - hydrogen. In the studied system a wind turbine and a photovoltaic generator are included, which are the main energy sources, while a fuel cell is used for supplying power to the load when the latter exceeds the produced output power. An electrolyzer and a hydrogen storage tank are used in order to convert excess power generation into hydrogen. The interconnection of individual subsystems and power management is carried out through a common DC bus with the help of specially designed controllers. The system produces no pollutants and is a reliable and environmentally friendly solution. All the subsystems are modeled in detail with mathematical equations in the Matlab /Simulink environment, where simulations were performed for four days of the year 2015, one for each season, in order to test the performance of the overall hybrid system. The data used for the simulation concern the area of Chania, as Crete has many remote rural areas with low population density, for which the system can provide a satisfactory solution to the electricity problem.

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