Search for dissertations about: "Small Hydropower"

Showing result 21 - 25 of 33 swedish dissertations containing the words Small Hydropower.

  2. 21. Extension of the Pressure Time Method to 3-Dimensional Flows

    Author : Mehrdad Kalantar Neyestanaki; Michel Cervantes; Pontus Jonsson; Georgiana Dunca; Thomas Staubli; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Abstract : Hydropower has stood as a clean and sustainable energy source since the late 19th century. Many turbines were built 50 to 70 years ago and require refurbishment. It is important to assess the efficiency of turbines before and after refurbishment to meet performance guarantees .However, the flow rate makes such estimation challenging. READ MORE

  4. 22. An experimental approach to energy storage based synthetic inertia and fast frequency regulation for grid balancing

    Author : Martin Fregelius; Urban Lundin; Roy Nilsen; Uppsala universitet; []
    Keywords : Renewable energy; Synthetic inertia; Enhanced inertia; Energy storage system; Hybrid energy storage system; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : The increasing interest in renewable energy has significantly increased in the last decades. The increasing amount of variable renewable energy resources in the grid, which are connected via power electronics, reduces the total mechanical system inertia. READ MORE

  5. 23. Characterization of dye-sensitized solar cells : Components for environmentally friendly photovoltaics

    Author : Hanna Ellis; Anders Hagfeldt; Gerrit Boschloo; Erik Johansson; Maria Hahlin; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; solar cells; dye-sensitized solar cells; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi;

    Abstract : As fossil fuels, the major source of energy used today, create the greenhouse gas carbon dioxide which causes global warming, alternative energy sources are necessary in the future. There is a need for different types of renewable energy sources such as hydropower, windpower, wave- power and photovoltaics since different parts of the world have different possibilities. READ MORE

  6. 24. Magnetic Leakage Fields and End Region Eddy Current Power Losses in Synchronous Generators

    Author : Birger Marcusson; Urban Lundin; Göran Engdahl; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; magnetic leakage fields; leakage flux; eddy currents; losses; synchronous generator; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : The conversion of mechanical energy to electrical energy is done mainly with synchronous generators. They are used in hydropower generators and nuclear plants that presently account for about 80% of the electric energy production in Sweden. READ MORE

  7. 25. Journal bearing design, lubrication and operation for enhanced performance

    Author : Gregory F Simmons; Rob Dwyer-Joyce; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Abstract : The increasing introduction of intermittent power sources combined with the de-regulation of electricity markets has led to increased instability in the electrical grid. This has led to increased start-up and shutdown of regulating power sources such as hydro-electric power plants and operation at non-ideal operating states both of which increase the wear and tear on machines. READ MORE