Search for dissertations about: "rate of change of frequency"

Showing result 1 - 5 of 84 swedish dissertations containing the words rate of change of frequency.

  1. 1. Integration of Non-synchronous Generation - Frequency Dynamics

    Author : Johan Björnstedt; Lund University.; Lunds universitet.; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Frequency control; Frequency dynamics; Frequency response; Non-synchronous generation; Power system; Synthetic inertia; Wind power;

    Abstract : Traditionally the predominant generation has been large synchronous generators providing the system inertia. Nowadays when wind power and other non-synchronously connected units displaces this synchronous generation, the system inertia is reduced. Hence higher rate of change of frequency and larger frequency deviations are expected. READ MORE

  2. 2. The Physiology of Chicken Domestication : Involvement of the HPA-axis and the Autonomic Nervous System

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Magnus Elfwing; Linköpings universitet.; Linköpings universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Domestication; chickens; HPA-axis; autonomic nervous system; heart rate; allometry;

    Abstract : Domesticering är en urvalsprocess för önskvärda egenskaper hos djur som över tid förändrar deras utseende, beteende och genetik. Några exempel av djur som genomgått denna riktade avel är vargen, mufflon, uroxen, vildsvinet och den röda djungelhönan som vi idag känner som hunden, fåret, kon, grisen och slaktkycklingen. READ MORE

  3. 3. Frequency Response by Wind Farms in Islanded Power Systems with High Wind Power Penetration

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Mattias Persson; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Synthetic inertia; rate of change of frequency; inertia emulation; variable speed wind turbine; frequency control;

    Abstract : The integration of variable speed wind turbines (VSWT) in power systems keep increasing inorder to reduce the emission of green house gases. This increase of power electronic converterinterfaced generation causes a decrease of power system inertia and issues previously existingin power systems tend to become more complicated and new solutions should be evaluated. READ MORE

  4. 4. Autonomic cardiac control in patients with epilepsy : spectral analysis of heart rate variability

    University dissertation from Stockholm : Karolinska Institutet, Department of Clinical Neuroscience

    Author : Håkan Persson; Karolinska Institutet.; Karolinska Institutet.; [2006]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; SUDEP; autonomic nervous system; heart rate variability; epilepsy; carbamazepine; epilepsy surgery;

    Abstract : The heart is affected by the central nervous system via sympathetic and para-sympathetic efferents from autonomic centres in the brain stem. By assessing the beat to beat variation of the RR-intervals of the heart, i.e. the heart rate variability (HRV) it is possible to separately analyse sympathetic and parasympathetic effects on the heart. READ MORE

  5. 5. Calling for change : the effectiveness of helpline counselling and spontaneous change in problematic alcohol use

    University dissertation from Stockholm : Karolinska Institutet, Dept of Public Health Sciences

    Author : Eleonor Säfsten; Karolinska Institutet.; Karolinska Institutet.; [2018]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Abstract : Population studies have estimated the remission rate from alcohol use disorders as well as the life course trajectory of alcohol consumption. However, less is known about the spontaneous change to low-risk use in populations of hazardous and heavy drinkers. READ MORE