Essays about: "weak ac systems"

Found 5 essays containing the words weak ac systems.

  1. 1. DC-DC Converter for Fast Charging with Mobile BESS in a Weak Grid : Enabling remote charging and increased efficiency with less resource intensity

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Alexander Medén; [2023]
    Keywords : Battery energy storage systems; Buck-boost; DC DC converter; Dual-active bridge; fast charging; DC charging; Mobile battery systems; Batterienergilagringssystem; Buck-boost; DC DC-omvandlare; Dual-active bridge; snabbladdning; DC-laddning; Mobila batterisystem;

    Abstract : With the increase of electric vehicles (EVs) on the roads the availability of charging infrastructure becomes more important. Today it is relatively straightforward to install fast chargers in areas with strong power grid connections, such as in urban areas. READ MORE

  3. 2. Towards a Cooper pair splitter in InAs nanowires with crystal-phase defined quantum dots

    University essay from Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Lunds Tekniska Högskola

    Author : Louise Olausson; [2022]
    Keywords : Cooper pair splitter; quantum dot; nanowire; superconductivity; InAs; crystal-phase; Physics and Astronomy;

    Abstract : Cooper pair splitting (CPS) is a process in which the two spin-entangled electrons of a Cooper pair in a superconductor are split into two spatially separated electrons. If the separated electrons are still entangled, CPS can be studied to increase the knowledge of non-locality in quantum systems. READ MORE

  4. 3. Control Strategies for VSC-HVDC links in Weak AC Systems

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Erik Björklund; [2019]
    Keywords : HVDC; VSC; voltage source converter; control theory; weak ac systems;

    Abstract : In this master thesis control systems for a voltage-source converter HVDC connected to weak ac networks are investigated. HVDC stands for high voltage direct current and is a way to transfer power in the electrical power system. READ MORE

  5. 4. Optimal Power Flow for an HVDC Feeder Solution for AC Railways

    University essay from KTH/Elektrisk energiomvandling

    Author : John Laury; [2012]
    Keywords : ;

    Abstract : With today’s increasing railway traffic, the demand for electrical power has increased. However, several railway systems are weak and are not being controlled optimally. Thus, transmission losses are high and the voltage can be significantly lower than the nominal level. READ MORE

  6. 5. To return or not return - Trend spotting in the Swedish market

    University essay from Lunds universitet/Nationalekonomiska institutionen

    Author : Henrik Fulgentiusson; Lenny Erlesand; [2010]
    Keywords : economic policy; economic systems; economic theory; econometrics; Economics; efficient market hypothesis EMH ; contrarian strategy; momentum; Random Walk; mean reversion; Sharpe Ratio; Nationalekonomi; ekonometri; ekonomisk teori; ekonomiska system; ekonomisk politik; Business and Economics;

    Abstract : The following essays checks whether the Swedish stock market (represented by OMXS30) supports the weak efficiency of the EMH by observing whether the stocks contain a unit root and whether one can use trading strategies to create abnormal profits. The AR(1) model of the stock prices have a unit root coefficient very close to 1, thus they are trend stationary but have a very long memory. READ MORE