Avancerad sökning
Visar resultat 16 - 20 av 87 avhandlingar som matchar ovanstående sökkriterier.
16. CFD of Air Flow in Hydro Power Generators
Sammanfattning : The air flow through a generator has been numerically investigated with different rotor and stator designs to give a better understanding of the flow for cooling purposes. A simple rotor design has been chosen to start with, and modified through a set of changes, where stepwisemodifications have been imposed to the design of the rotor and the stator. LÄS MER
17. EAL's boundary lubrication performance in hydro power plants
Sammanfattning : This licentiate thesis concerns the possibility to change mineral based hydraulic fluid to environmentally adapted lubricants (EAL's) in water turbine applications from the point of view of boundary lubrication. A new test rig was designed to meet the conditions for a slow and/or intermittent motion journal bearing. LÄS MER
18. Some Control Applications in Electric Power Systems
Sammanfattning : This thesis presents some control applications in electric power systems. The work consists of the four parts: interaction between DC cables and ship steering autopilots; frequency estimation; computer relaying; field tests using load switching to damp power oscillations. LÄS MER
19. DC Distributed Power Systems - Analysis, Design and Control for a Renewable Energy System
Sammanfattning : Renewable energy systems are likely to become wide spread in the future due to environmental demands. As a consequence of the dispersed nature of renewable energy systems, this implies that there will be a distributed generation of electric power. LÄS MER
20. Wind Power in Areas with Limited Export Capability
Sammanfattning : During the last two decades, increase in electricity demand and environmental concern resulted in fast growth of power production from renewable sources. Wind power is one of the most efficient alternatives. LÄS MER