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Assessing the applicability of low voltage direct current in electricity distribution : key factors and design aspects
(Lappeenranta-Lahti University of Technology LUT, 2020-11-20)
In many countries, the electricity distribution companies are facing the challenge of how to develop the networks effectively and respond to the future needs of societies. Changes in the electricity end use, aging network ...
Application of software-defined radio for power-line-communication-based monitoring
(Lappeenranta-Lahti University of Technology LUT, 2020-02-07)
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 ...
Energy efficient hydrogen production by water electrolysis
(Lappeenranta-Lahti University of Technology LUT, 2020-02-28)
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 ...
Identification of magnetically levitated machines
(Lappeenranta-Lahti University of Technology LUT, 2020-06-16)
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 ...
Modeling and Analysis of a High-Speed Solid-Rotor Induction Machine
(Lappeenranta-Lahti University of Technology, 2020-04-28)
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 ...
Acoustic Emission Testing of Multilayer Ceramic Capacitors
(Lappeenranta-Lahti University of Technology LUT, 2022-03-25)
Capacitors are among the three fundamental passive electrical components alongside inductors and resistors. They are found in nearly every electronic circuit, with the function of storing electrical energy and filtering ...
Usability and limitations of behavioural component models in IGBT short-circuit modelling
(Lappeenranta-Lahti University of Technology LUT, 2020-09-04)
Power electronic device design and electrical system analysis can be enhanced by applying modern simulation tools, which make it possible to decrease the use of costly and time-consuming prototypes. One very critical ...
Analysis of theory and methodology used in determination of electric motor drive system losses and efficiency
(Lappeenranta-Lahti University of Technology LUT, 2021-04-23)
This research is divided into two main parts: loss determination of motors, converters, and motor drive systems and determination of measurement uncertainty. With its accurate measurements and data analysis, the work ...
Applicability of GaN high electron mobility transistors in a high-speed drive system
(Lappeenranta-Lahti University of Technology LUT, 2020-02-10)
Lossless operation and instantaneous switching are properties of an ideal power electronic switch. Wide band gap devices based on gallium nitride (GaN) are the current peak performers in regard to losses and switching ...
Evaluation of failure mechanisms in electronics using X-ray imaging
(Lappeenranta-Lahti University of Technology LUT, 2022-09-30)
Multilayer ceramic capacitors and thick film resistors are widely used in electronic circuits for frequency converters because of their small size and volumetric efficiency. In addition, as a result of the current trend ...