Sökning: "facts"

Visar resultat 6 - 10 av 367 avhandlingar innehållade ordet facts.

1. 6. Power Electronics for Mitigation of Voltage Sags and Improved Control of AC Power Systems

   Författare :Marcio Magalhães de Oliveira; KTH; []
   Nyckelord :power electronics; power quality; voltage sags; voltage-source converters; Custom Power; FACTS; real-time simulations; solid-state devices;

   Sammanfattning : The thesis deals with the application of compensators andswitches based on power electronics in AC transmission anddistribution systems. The objective of the studieddevices/equipment is the power flow and voltage control intransmission systems and the mitigation of voltage sags andmomentary interruptions to critical loads in distributionsystems. LÄS MER

3. 7. Synchronous Voltage Reversal Control of Thyristor Controlled Series Capacitor

   Författare :Lennart Ängquist; KTH; []
   Nyckelord :ThyristorControlled Series Capacitor; TCSC; FACTS; reactive power compensation; boost control; phasor estimation; Quantitative Feedback Theory; subsynchronous resonance; SSR;

   Sammanfattning : Series compensation of transmission lines is an effectiveand cheap method of improving the power transmission systemperformance. Series capacitors virtually reduces the length ofthe line making it easier to keep all parts of the power systemrunning in synchronism and to maintain a constant voltage levelthroughout the system. LÄS MER

4. 8. On control of cascaded H-bridge converters for STATCOM applications

   Författare :Ehsan Behrouzian; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cascaded H-bridge converters; FACTS.; Modular Multilevel Converters MMC ; STATCOM;

   Sammanfattning : Cascaded H-bridge (CHB) converters are today considered the industrial standard for STATCOM applications, mainly due to their small footprint, high achievable voltage levels, modularity and reduced losses. However, there are still areas of research that need to be investigated in order to improve the performance and the operational range of this converter topology for grid-applications. LÄS MER

5. 9. Operation and control of cascaded H-bridge converter for STATCOM application

   Författare :Ehsan Behrouzian; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modular Multilevel Converters MMC ; STATCOM; FACTS.; cascaded H-bridge converters;

   Sammanfattning : In the last decade, particular attention has been paid to the use of Modular Multilevel Converters(MMC) for grid applications. In particular, for STATCOM applications the phase leg ofthe converter is constituted by a number of single-phase full-bridge converters connected incascade (here named Cascaded H-Bridge, CHB, converter). LÄS MER

7. 10. Stödbevisning i brottmål

   Författare :Katrin Lainpelto; Christian Diesen; Frank Lindblad; Dan Frände; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; theory of evidence; evidence law; evaluation of evidence; evidence; evidentiary facts; circumstantial evidence; auxiliary facts; corroborating evidence; the principle of free evaluation of evidence; equal treatment; legal certainty; reasons for a decision; conceptual analysis; epistemology; rationality; justification; precedent; processrätt; Procedural Law;

   Sammanfattning : Corroborating evidence is a modern evidence law concept used in furtherance of the administration of justice. The exact meaning of the term is, however, unclear, which is why the concept can be described as both vague and ambiguous. Accordingly, the aim of this thesis was to examine this type of evidence with the help of functional analysis. LÄS MER