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Visar resultat 1 - 5 av 141 avhandlingar som matchar ovanstående sökkriterier.
1. Analysis of Synchronous machine dynamics using a novel equivalent circuit model
Sammanfattning : This thesis investigates simulation of synchronous machines using a novel Magnetic Equivalent Circuit (MEC) model. The proposed model offers sufficient detail richness for design calculations, while still keeping the simulation time acceptably short. Different modeling methods and circuit alternatives are considered. LÄS MER
2. Assessment of safety characteristics for Li-ion battery cells by abuse testing
Sammanfattning : Despite the many advantages with lithium-ion batteries there can be disadvantages in form of safetyissues. In an abuse situation a Li-ion cell can undergo a thermal runaway releasing excessive heat,flammable and toxic gas emissions and eventually accompanied by dissembling/explosion and fire. LÄS MER
3. Steady State Operation and Control of Power Distribution Systems in the Presence of Distributed Generation
Sammanfattning : In this thesis, the impact of distributed generation (DG) on steady state operation and control of power distribution systems is investigated. Over the last few years, a number of factors have led to an increased interest in DG schemes. DG is gaining more and more attention worldwide as an alternative to large-scale central generating stations. LÄS MER
4. Condition measuring and lifetime modelling of disconnectors, circuit breakers and other electrical power transmission equipment
Sammanfattning : The supply of electricity is important in modern society, so the outages of the electric grid should be few and short, especially for the transmission grid. A summary of the history of the Swedish electrical system is presented. The objective is to be able to plan the maintenance better by following the condition of the equipment. LÄS MER
5. On Reliability of SiC Power Devices in Power Electronics
Sammanfattning : Silicon Carbide (SiC) is a wide-bandgap (WBG) semiconductor materialwhich has several advantages such as higher maximum electric field, lowerON-state resistance, higher switching speeds, and higher maximum allowablejunction operation temperature compared to Silicon (Si). In the 1.2 kV - 1. LÄS MER