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LCL Filter Designs for Parallel-Connected Grid Inverters
(Lappeenranta University of Technology, 2018-12-04)
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 ...
Transition towards long-term sustainability of the Finnish energy system
(Lappeenranta University of Technology, 2018-11-01)
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 ...
Ferrite Permanent Magnet Hysteresis Loss in Rotating Electrical Machinery
(Lappeenranta-Lahti University of Technology LUT, 2019-11-15)
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 ...
Modelling and Disturbance Compensation of a Permanent Magnet Linear Motor with a Discontinuous Track
(Lappeenranta-Lahti University of Technology LUT, 2019-06-11)
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 ...
Active residential customer in a flexible energy system — a methodology to determine the customer behaviour in a multi-objective environment
(Lappeenranta University of Technology, 2018-12-05)
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 ...
Optimizing the specific energy consumption of vacuum filtration
(Lappeenranta-Lahti University of Technology LUT, 2019-12-13)
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 ...
Design and control of a permanent magnet bearingless machine
(Lappeenranta-Lahti University of Technology LUT, 2019-11-29)
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 ...
Improving the DC-DC Power Conversion Efficiency in a Solid Oxide Fuel Cell System
(Lappeenranta-Lahti University of Technology LUT, 2019-11-29)
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 ...
The role of renewable energy based seawater reverse osmosis (SWRO) in meeting the global water challenges in the decades to come
(Lappeenranta-Lahti University of Technology LUT, 2020-11-25)
Renewable energy (RE) powered desalination is rapidly gaining interest as a means to augment the increasingly stressed global water supply. This thesis introduces and describes the ways in which 100% RE-based seawater ...
Variable-speed-drive-based monitoring and diagnostic methods for pump, compressor, and fan systems
(Lappeenranta-Lahti University of Technology LUT, 2021-02-05)
Pumps, fans, and compressors account for nearly a third of the global consumption of electricity. Variable-speed drives (VSD) enable energy-efficient capacity control of these devices, and have thus become a common component ...