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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 ...
Ownership unbundling in electricity distribution: The Russian experience
(Elsevier, 2018-10-15)
Russia is the first and thus far only country that has separated ownership of electricity distribution and transmission and then, a few years later, reunified these services under one company. We examine the impact of these ...
Effect of Converter Topology on the Specific Energy Consumption of Alkaline Water Electrolyzers
(IEEE, 2018-10-17)
Water electrolysis will be used to produce renewable hydrogen for energy storage and Power-to-X applications in the future renewable-energy-based energy systems. Therefore, the energy efficiency of hydrogen production will ...
Dynamic analysis of flexible multibody systems using finite elements based on the absolute nodal coordinate formulation
(Lappeenranta University of Technology, 2018-10-19)
The computational analysis of mechanical systems has a wide array of applications and is therefore essential in many fields of modern industry. This dissertation studies the simulation of mechanical systems using the ...
Pattern recognition algorithm for analysis of chugging direct contact condensation
(Elsevier, 2018)
Direct contact condensation of steam bubbles in a boiling water reactor suppression pool has long been studied utilizing video recording of experiments. The use of video recording enables observation of the behaviour of ...
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 ...
Dynamic analysis of rotating systems including contact and thermal-induced effects
(Lappeenranta University of Technology, 2018-10-16)
Rotor dynamics is a special field of structural dynamics focusing on the study and analysis of rotating structures. Practical applications for rotor dynamics are found in typical industrial rotating electrical machine ...
Product Processes based on Digital Twin
(Springer Vieweg, Wiesbaden, 2018-05-03)
Product development is performed by accomplished designers who make their best efforts to understand customer needs and desires via verbal or written feedback. This approach becomes cumbersome if a product design undergoes ...
Nonlinear PI-control approach for improving the DC link voltage control performance of a power factor corrected system
(IEEE, 2018)
When fast voltage control is used in a power factor control, the ripple of the DC link causes current harmonics. This paper proposes a method to reduce the harmonic content of a fast voltage loop in a power factor correction ...
Experimentation on Wind Powered Hydraulic Heating System
(IEEE, 2018-09-27)
It is common knowledge of the world’s dependency on fossil fuel for energy, its unsustainability on the long run and the changing trend towards renewable energy as an alternative energy source. This aims to cut down ...