Search for dissertations about: "modular"

Showing result 21 - 25 of 380 swedish dissertations containing the word modular.

  2. 21. Modeling and Design of Modular MultilevelConverters for Grid Applications

    Author : Kalle Ilves; Nee Hans-Peter; Alireza Nami; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modular multilevel converter; feed-forward control; modulation; switching frequency; energy storage;

    Abstract : Grid-connected high-power converters are found in high-voltage direct current transmission (HVDC), static compensators (STATCOMs), and supplies for electric railways. Such power converters should have a high reliability, high efficiency, good harmonic performance, low cost, and a small footprint. READ MORE

  4. 22. Modeling of Modular Multilevel Converters for Stability Analysis

    Author : Luca Bessegato; Stefan Östlund; Staffan Norrga; Lennart Harnefors; Xiongfei Wang; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modular multilevel converters MMCs ; stability; admittance; frequency-domain analysis; linearization techniques; current control; voltage control; ac ac converters; railway engineering.; Modulära multinivåomvandlare MMC ; stabilitet; admittans; frekvensanalys; linjäriseringsmetoder; strömreglering; spänningsreglering; ac ac omvandlare; järnvägsteknik.; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Modular multilevel converters (MMCs) have recently become the state-of-the-art solution for various grid-connected applications, such as high-voltage direct current (HVDC) systems and flexible alternating current transmission systems (FACTS). Modularity, scalability, low power losses, and low harmonic distortion are the outstanding properties that make MMCs a key technology for a sustainable future. READ MORE

  5. 23. On conceptual development of modular products - Development of supporting tools for the modularisation process

    Author : Roger Stake; KTH; []
    Keywords : Conceptual product development; modular products; product families; module drivers; tools;

    Abstract : The research work detailed in this dissertation relates tothe development of modular products and product families.Historically, product variants have been developed more or lessindependently; but in order to stay competitive in today’sbusiness environment where globalisation and explosion ofvariety are some of the buzzwords, products should be developedas a product family. READ MORE

  6. 24. On Modeling and Optimal Control of Modular Batteries: Thermal and State-of-Charge Balancing

    Author : Faisal Altaf; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; convex optimization; converters; electrified vehicles.; model predictive control; thermal balancing; SOC balancing; battery control; Modular batteries;

    Abstract : There has in recent years been an increasing interest in battery-powered electrified vehicles (xEVs) to reduce carbon footprint of transportation and the dependence on fossil fuels. Since the battery pack of xEVs is one of the most expensive but a key component in the powertrain, the battery lifetime is an important factor for the success of xEVs. READ MORE

  7. 25. Whatever goes around comes around : modular invariance in string theory and conformal field theory

    Author : Patrick D. Roberts; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; conformal field theory; Kac-Moody algebra; covariant lattice; modular invariance; string theory;

    Abstract : .... READ MORE