Selaus koulutusohjelman mukaan kokoelmassa VäitöskirjatSchool of Energy Systems, Sähkötekniikka

    • Active residential customer in a flexible energy system — a methodology to determine the customer behaviour in a multi-objective environment 

      Belonogova, Nadezda
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 05.12.2018)
      The transformation from passive into active end customers in modern energy systems has already started in many European countries, and it is a long process. The first step to engage residential customers to be active actors ...
    • Application of software-defined radio for power-line-communication-based monitoring 

      Poluektov, Anton
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 07.02.2020)
      Power line communication (PLC) is an established telecommunication technology. A PLC-based communication system has the advantage of securing data. transmission over already existing power line networks. In this way, an ...
    • Design and control of a permanent magnet bearingless machine 

      Jaatinen, Pekko
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.11.2019)
      The overall efficiency of high-speed applications can be improved by applying direct drive motor technology. Operating in the high-speed region is a demanding task for the traditional bearing technology. With active magnetic ...
    • Energy efficient hydrogen production by water electrolysis 

      Koponen, Joonas
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 28.02.2020)
      Hydrogen is the most abundant element in the universe. On Earth, it not only forms water molecules, but also commonly combines with carbon into hydrocarbons that power the current world economy. The use of these natural ...
    • Ferrite Permanent Magnet Hysteresis Loss in Rotating Electrical Machinery 

      Egorov, Dmitry
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 15.11.2019)
      Electrical machines with permanent magnets (PMs) find numerous applications in present energy-efficient technologies. A reasonable compromise in terms of costs and efficiency makes electrical machines with ferrite PMs a ...
    • Grid Support by Battery Energy Storage System Secondary Applications 

      Alaperä, Ilari
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 13.12.2019)
      Global developments in renewable energy and energy efficiency of the power consumption present challenges to maintain the frequency stability of the electricity grids. The objective of the research is to investigate how ...
    • Identification of magnetically levitated machines 

      Vuojolainen, Jouni
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 16.06.2020)
      Magnetically levitated machines use magnetic levitation to maintain the separation between the bearing races. They offer various benefits compared with other types of bearings: no contact between the bearing races, the ...
    • Improving the DC-DC Power Conversion Efficiency in a Solid Oxide Fuel Cell System 

      Hiltunen, Jani
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.11.2019)
      The solid oxide fuel cell (SOFC) is a promising technology for combined heat and power generation as it provides low local emissions, high efficiency, and fuel flexibility. However, the unique electrical characteristics ...
    • LCL Filter Designs for Parallel-Connected Grid Inverters 

      Juntunen, Raimo
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 04.12.2018)
      Power generation has become more dispersed as a result of the increasing popularity of the renewable energy sources, which interface with the utility grid with power electronic converters. Higher power levels can be achieved ...
    • Modeling and Analysis of a High-Speed Solid-Rotor Induction Machine 

      Di, Chong
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology, 28.04.2020)
      Over the last few decades, high-speed electrical machines have become more popular than ever before because of the rapid development of power electronics, magnetic materials, and control engineering. Among all the machine ...
    • Modelling and Disturbance Compensation of a Permanent Magnet Linear Motor with a Discontinuous Track 

      Huikuri, Marko
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 11.06.2019)
      It is very common that industrial applications require linear motion in some part of the process, especially in transportation of products from place to place. Traditional technologies to produce short-distance linear ...
    • Optimizing the specific energy consumption of vacuum filtration 

      Huttunen, Manu
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 13.12.2019)
      Vacuum filtration is applied in solid-liquid separation in a wide variety of industrial processes for instance in the mining, chemical, and paper industries. The main contributor to the considerable energy consumption of ...
    • The applicability of GaN high electron mobility transistors in a high-speed drive system 

      Jarvisalo, Heikki
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 10.02.2020)
      Lossless operation and instantaneous switching are properties of an ideal power elec-tronic switch. Wide band gap devices based on gallium nitride (GaN) are the current peak performers in regard to losses and switching ...
    • Transition towards long-term sustainability of the Finnish energy system 

      Child, Michael
      Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 01.11.2018)
      This dissertation describes the meaning, potential elements and impact of a transition towards the long-term sustainability of the Finnish energy system. Such a transition is possible that would adhere to the goals of the ...