Sökning: "Grids"

Visar resultat 1 - 5 av 302 avhandlingar innehållade ordet Grids.

1. 1. Hybrid Grid Generation for Viscous Flow Computations Around Complex Geometries

   Författare :Lars Tysell; Laszlo Fuchs; Nigel P. Weatherill; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; grid generation; unstructured grids; hybrid grids; surface grids; three-dimensional grids; adaptive grids; moving grids; grid quality; accuracy; Fluid mechanics; Strömningsmekanik;

   Sammanfattning : A set of algorithms building a program package for the generation of twoandthree-dimensional unstructured/hybrid grids around complex geometrieshas been developed. The unstructured part of the grid generator is based on the advancing frontalgorithm. LÄS MER

3. 2. Distributed Control of HVDC Transmission Grids

   Författare :Davood Babazadeh; Lars Nordström; Oriol Gomis; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; co-simulation; cyber-physical system; DC slack bus; distributed control; HVDC grids; power injection; topology processor; wind farms; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Recent issues such as priority access of renewable resources recommended by European energy directives and increase the electricity trading among countries lead to new requirements on the operation and expansion of transmission grids. Since AC grid expansions are limited by legislative issues and long distance transmission capacity, there is a considerable attention drawn to application of HVDC transmission grids on top of, or in complement to, existing AC power systems. LÄS MER

4. 3. Energy Storage Systems in Electrical Distribution Grids : Analysis and implementations of use cases for service stacking

   Författare :Johannes Hjalmarsson; Cecilia Boström; Karin Thomas; Louise Ödlund; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ancillary services; congestion management; distribution grids; energy storage systems; scheduling optimization; service stacking.;

   Sammanfattning : This Ph.D. thesis investigates the possibility of using energy storage systems for multiple services by implementing service stacking, with special emphasis on congestion management in distribution grids. LÄS MER

5. 4. Parallel computational fluid dynamics on overlapping grids

   Författare :Stefan Nilsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; partition of unity; line-implicit time-integration; incompressible flows; suspension feeders; benthic boundary layers; bivalves; computational fluid dunamics; Overlapping grids; parellel computing; grid partitioning;

   Sammanfattning : .... LÄS MER

7. 5. Demand Response Polices for the Implementation of Smart Grids

   Författare :Elta Koliou; Lennart Söder; Rudi Hakvoort; Marloes Dignum; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; demand response; smart grids; dynamic pricing; balancing; policy; tariffs; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : With the grasp of a smart grid in sight, discussions have shifted the focus of system security measures away from generation capacity; apart from modifying the supply side, demand may also be exploited to keep the system in balance. Specifically, Demand Response (DR) is the concept of consumer load modification as a result of price signaling, generation adequacy, or state of grid reliability. LÄS MER