Sökning: "Multilevel"

Visar resultat 6 - 10 av 251 avhandlingar innehållade ordet Multilevel.

  1. 6. Multilevel Power Converters with Smart Control for Wave Energy Conversion

    Författare :Deepak Elamalayil Soman; Mats Leijon; Jan Isberg; Sebastain Nielebock; Gopal Mondal; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multilevel power converter; FPGA control; Wave Energy; Three-level boost converter; Three-level buck-boost converter; Variable-renewable-energy; Three-level neutral point clamped inverter; Linear generator; DC-link; AC2AC direct converter; Modular multilevel converter; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Sammanfattning : The main focus of this thesis is on the power electronic converter system challenges associated with the grid integration of variable-renewable-energy (VRE) sources like wave, marine current, tidal, wind, solar etc. Wave energy conversion with grid integration is used as the key reference, considering its high energy potential to support the future clean energy requirements and due the availability of a test facility at Uppsala University. LÄS MER

  3. 7. Issues of Complex Hierarchical Data and Multilevel Analysis : Applications in Empirical Economics

    Författare :Joel Karlsson; Ghazi Shukur; Håkan Locking; Scott Hacker; Linnéuniversitetet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Multilevel modelling; Hierarchical modelling; Single farm payments; Part-time unemployment; Educational attainment; Performance evaluation; Economics; Nationalekonomi;

    Sammanfattning : This thesis consists of four individual essays and an introduction chapter. The essays are in the field of multilevel analysis of economic data. The first essay estimates capitalisation effects of farm attributes, with a particular focus on single farm payments (SFP), into the price of farms. LÄS MER

  4. 8. Analysis of Some Convolutional Coding Constructions

    Författare :Karin Engdahl; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbo-codes; low-density parity-check convolutional codes; low-density codes; PSK; PAM; QAM; coded modulation; multilevel coding; convolutional codes; multilevel modulation; iterative decoding; Informatics; systems theory; Informatik; systemteori;

    Sammanfattning : This thesis focuses on different convolutional coding constructions for digital communication systems, and on methods to analyze these constructions. The work presented in the thesis can be divided into three main areas; error probability bounds for convolutional codes, analysis of multilevel modulation, and investigation of low-density parity-check convolutional codes. LÄS MER

  5. 9. Inverter Design for SiC-based Electric Drive Systems with Optimal Redundant States Control of Space Vector Modulation

    Författare :Georgios Mademlis; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric Vehicle; Common Mode Voltage; Power Hardware-in-the-Loop; Tidal power; Voltage balancing; Silicon Carbide SiC ; Medium Voltage Converters; Multilevel; Neutral Point Clamped NPC ; Maximum Power Point Tracking MPPT ; Space Vector Modulation;

    Sammanfattning : The need for inverters with ever increasing power density and efficiency has recently become the driving factor for research in various fields. Increasing the operating voltage of the whole drive system and utilizing newly developed SiC power switches can contribute towards this goal. LÄS MER

  7. 10. Managing the Transformation Towards Advanced Service Provision : A Multilevel Framework of Servitization

    Författare :Sambit Lenka; Daniel Kindström; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Servitization; Advanced Services; Multilevel; Transformation; Ambivalence; Microfoundations; Capabilities; Entreprenörskap och innovation; Entrepreneurship and Innovation;

    Sammanfattning : Product-oriented firms are increasingly moving towards providing services to customers in a bid to differentiate their offerings, increase customer loyalty, and achieve higher, more stable revenue streams. This trend of servitization is becoming ubiquitous in manufacturing firms. LÄS MER