Sökning: "frequency support"

Visar resultat 1 - 5 av 470 avhandlingar innehållade orden frequency support.

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

   Författare :Johan Björnstedt; Industriell elektroteknik och automation; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Frequency control; Frequency dynamics; Frequency response; Non-synchronous generation; Power system; Synthetic inertia; Wind power;

   Sammanfattning : 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. LÄS MER

3. 2. Integrated Frequency Synthesis for Convergent Wireless Solutions

   Författare :Jad G. Atallah; Mohammed Ismail Elnaggar; Erik Bruun; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wireless; transceiver; Bluetooth; DECT; GSM; 3G; LTE; WLAN; WiMAX; multi-standard; vertical handover; Sniffer; frequency synthesizer; phase-locked loop; PLL; sigma-delta; calibration; Electronics; Elektronik;

   Sammanfattning : Wireless transceivers combining several standards in one unit are of key importance. In order to reach the ultimate goal of maximizing the performance-to-cost ratio of such modules, a careful study of the target application, the architecture, and the frequency planning is strongly required. LÄS MER

4. 3. Digital support for people with cognitive impairment : An intervention to increase the occupational performance in everyday life

   Författare :Maria Andreassen; Helena Hemmingsson; Tiny Jaarsma; Henrik Danielsson; Inga-Lill Boman; Susanne Guidetti; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Active reminder; Assistive technology for cognition; Cognitive impairment; Digital support; Habits; Occupational Performance; Occupational therapy; Rehabilitation; Smartphone; Stroke; Timemanagement;

   Sammanfattning : Introduction: Senior people with cognitive impairment may experience an inability to manage everyday life due to difficulties related to time management, and planning and structuring everyday life. These difficulties can affect people negatively, for example not remembering to carry out future planned activities. LÄS MER

5. 4. Coordinated Frequency Control Between Interconnected AC/DC Systems

   Författare :Danilo Obradovic; Mehrdad Ghandari; Robert Eriksson; Jonas Persson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power System Dynamics; Frequency Stability; Small Signal Stability; HVDC Supplementary Power Control; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : With ambitions of reducing the environmental pollution, power systems integrate larger shares of Renewable Energy Sources (RES) to phase out conventional thermal and nuclear generators. Since RES (such as wind and solar power) are connected to the grid through power electronics devices, they do not inherently contribute to system inertia. LÄS MER

7. 5. Coordinated Frequency Control Using DC Interconnections Between AC Systems : Utilizing Fast Frequency Support through HVDC Links and Evaluating the Newly Uncovered Dynamics in Low-Inertia Power Systems

   Författare :Danilo Obradovic; Robert Eriksson; Mehrdad Ghandhari; Damian Flynn; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Transmission system operators are increasingly adopting renewable energy sources in response to the escalating need to reduce environmental pollution. However, renewable energy sources, like wind and solar power, connect to the grid through power electronics, offering no inherent inertia. LÄS MER