Sökning: "Power beräkning"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden Power beräkning.

  1. 1. Managing uncertainties through efficient calculation of transients and harmonic propagation in power systems

    Författare :Oscar Lennerhag; Math Bollen; Jan Lundquist; David Thomas; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Overvoltages; harmonics; uncertainties; stochastic methods; Electric Power Engineering; Elkraftteknik;

    Sammanfattning : The electric power system is undergoing changes including large-scale introduction of renewable energy sources together with HVDC/FACTS, changes in the network such as increased amount of high voltage cables, industrial electrification, and changes in the load composition. These changes will impact the system in different ways and lead to challenges that must be addressed to facilitate planning, dimensioning, and operation of the system in a secure and economical way. LÄS MER

  3. 2. Renewing power : Including global asymmetries within the system boundaries of solar photovoltaic technology

    Författare :Andreas Roos; Humanekologi; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; solar energy; photovoltaic technology; ecologically unequal exchange; philosophical materialism; social metabolism; political artifacts; authoritarian technics; machine fetishism; environmental justice; environmental sustainability; solar power;

    Sammanfattning : Solar photovoltaic (PV) technology is one of the most favored means of mitigating climate change. At the same time, there is a growing concern over how this technology is both environmentally harmful and unevenly distributed in the world economy. LÄS MER

  4. 3. 14C Produced by Nuclear Power Reactors - Generation and Characterization of Gaseous, Liquid and Solid Waste

    Författare :Åsa Magnusson; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; waste disposal; spent ion-exchange resins; mass balance assessment; Nuclear physics; environmental impact; Fysicumarkivet A:2007:Magnusson; nuclear power plant; Kärnfysik; Carbon-14;

    Sammanfattning : This thesis presents the results from studies on carbon-14 produced by nuclear power reactors. Radioactive 14C enters the carbon cycle and can be taken up by humans, where it will constitute a potential health hazard. LÄS MER

  5. 4. Some Fluid Dynamic Characteristics in the Scale-up of Rushton Turbine-Agitated Tanks

    Författare :Eva Ståhl Wernersson; Livsmedelsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical technology and engineering; Livsmedelsteknik; Food and drink technology; Rushton turbine; turbulent kinetic energy; geometry; local energy dissipation rate; power input; scale-up; anemometry measurements; agitated tanks; turbulence; Kemiteknik och kemisk teknologi;

    Sammanfattning : Turbine-agitated tanks are used in chemical and biochemical applications to increase mixing which, in turn, affects the yield, productivity and product quality. The purpose of this work was to study the hydrodynamic influence on the scale-up of turbine-agitated tanks, commonly used in fermentation. LÄS MER

  7. 5. Efficient Trading in the Short-term Electricity Markets for Integration of Renewable Energy Sources : Multistage Stochastic and Agent-based Modeling Approaches for Continuous Intraday Electricity Market

    Författare :Priyanka Shinde; Mikael Amelin; Lennart Söder; Nikolaos Paterakis; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Continuous intraday electricity market; Virtual power plant; Trading strategy; Stochastic dual dynamic program; Agent-based modeling; Adaptive learning; Renewable energy sources; Cross-border intraday trading; Flow-based market coupling; Balancing market; Imbalance settlement cost; Randomized progressive hedging; Multistage stochastic programming; Energy storage; Intraday prices; Intraday price analysis; Time series analysis; Kontinuerliga intradagmarknaden; Virtuellt kraftverk; Handelsstrategi; Stokastisk dual dynamisk programmering; Agentbaserad modellering; Adaptivt l¨arande; F¨ornybara energik¨allor; Gr¨ans¨overskridande intradaghandel; Fl¨odesbaserad marknadskoppling; Balansmarknaden; Balansavr¨akningskostnader; Randomiserad progressive hedging; Stokastisk multiskedesprogrammering; Energilagring; Intradagpriser; Intradagprisanalys; Tidsserieanalys; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis investigates the role of different short-term electricity market design aspects that can facilitate better coordination of resources within the power system. The work also emphasizes on better cross-border integration of the short-term markets to improve the market liquidity, competition, social welfare, and flexibility in the system, which is essential for facilitating the integration of renewable sources. LÄS MER