Sökning: "Multilevel converter"

Visar resultat 6 - 10 av 30 avhandlingar innehållade orden Multilevel converter.

1. 6. Efficient Modeling of Modular Multilevel Converters for HVDC Transmission Systems

   Författare :Noman Ahmed; Hans-Peter Nee; Tim Green; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-Voltage dc; Modular Multilevel Converter; Voltage-Source Converter; HVDC Grids; Multiterminal DC Systems; Hybrid HVDC Breaker; Modeling; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The drive towards getting more and more electrical energy from renewable sources, requires more efficient electric transmission systems. A stronger grid, with more controllability and higher capacity, that can handle power fluctuations due to a mismatch between generation and load is also needed. LÄS MER

3. 7. Thermal and State-of-Charge Balancing of Batteries using Multilevel Converters

   Författare :Faisal Altaf; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermal balancing; Convex optimization; DC-link ripple; Battery ripple; Battery control; Hybrid electric vehicles.; Multilevel converter; Cell balancing;

   Sammanfattning : Driven by the needs to reduce the dependence of fossil fuels and the emissions of conventional vehicles there has in recent years been an increasing interest in battery-powered electrified vehicles (xEVs). In xEVs, the battery pack, built from many small cells, is one of the most expensive components in the powertrain. LÄS MER

4. 8. Control, Modulation and Implementation of Modular Multilevel Converters

   Författare :Antonios Antonopoulos; Hans-Peter Nee; Colin Oates; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modular Multilevel Converter; Modulation; Feedback Control; Open-Loop Control; Implementation; Prototype; High-Performance Motor Drives; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Sammanfattning : Denna avhandling behandlar analys och styrning av den modulära multinivå omvandlaren (M2C). M2C är en lovande omvandlarteknologi för högspända högeffekttillämpningar. Anledningen till detta är låg distorsion i utstorheterna kan uppnås med låg  medelswitchfrekvens per switch och utan utgångsfilter. LÄS MER

5. 9. Cost-effective Cells for High-power Modular Multilevel Converters

   Författare :Matthijs Heuvelmans; Staffan Norrga; Hans-Peter Nee; Rik De Doncker; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MMC; modular multilevel converter; ARCP; IGCT; soft-switching; ZVS; ZCS; snubber; thyristor; SCR; silicon controlled rectifier; HVDC; STATCOM; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The modular multilevel converter (MMC) topology was introduced in 2003and has since been receiving considerable attention from industry and academia.Notable benefits compared to two- or three-level voltage source convertersare its scalability, low switching losses, low output filter requirementsand ease of adding redundancy combined with fail-safe operation. LÄS MER

7. 10. Modeling and Design of Modular Multilevel Converters for Grid Applications

   Författare :Kalle Ilves; Hans-Peter Nee; Rainer Marquardt; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modular multilevel converter; feed-forward control; modulation; switching frequency; energy storage;

   Sammanfattning : This thesis aims to bring clarity to the dimensioning aspects and limiting factors of the modular multilevel converter (MMC). Special consideration is given to the dc capacitors in the submodules as they are a driving factor for the size and weight of the converter. LÄS MER