Browsing Institutt for elkraftteknikk by Issue Date
Now showing items 1-20 of 2570
-
Power supply interruption costs: Models and methods incorporating time dependent patterns
(Doktor ingeniøravhandling;1996:101, Doctoral thesis, 1996)The main results of this thesis are improved methods for the estimation of annual interruption costs for delivery points from electricity utilities to the end users. The improvements consist of a combined representation ... -
Electrical and Thermal Ageing of Extruded Low Density Polyethylene Insulation Under HVDC Conditions
(Dr. ingeniøravhandling, 0809-103X; 2000:125, Doctoral thesis, 2000)After extensive research during the last decades extruded polymeric insulation is now becoming an alternative to the traditional oil-paper systems for high voltage DC (HVDC) cables. Durability is of great importance for ... -
Ageing and Restoration of Transformer Windings
(Research report, 2001) -
Long Term Planning in Restructured power Systems: Dynamic Modelling of Investments on New Power Generation under Uncertainty
(Dr. ingeniøravhandling, 0809-103X; 2003:106, Doctoral thesis, 2003)This thesis describes the development of three decision support models for long-term investment planning in restructured power systems. The model concepts address the changing conditions for the electric power industry, ... -
Analysis and modelling of the dynamics of aggregate energy demand
(Dr. ingeniøravhandling, 0809-103X; 2003:88, Doctoral thesis, 2003)The thesis consists of four papers that can be read separately. The papers involve analyses and modelling of residential energy demand. Through my work I have derived a nonlinear time-series econometric model and a ... -
Risk Management in Electricity Markets Emphasizing Transmission Congestion
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:42, Doctoral thesis, 2004)This thesis analyzes transmission pricing, transmission congestion risks and their associated hedging instruments as well as mechanisms for stimulating investments in transmission expansion. An example of risk management ... -
Sensorless Control of Permanent Magnet Synchronous Machines
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:147, Doctoral thesis, 2004)As the cost for permanent magnets are decreasing and the quality of the magnets are increasing the Permanent Magnet Synchronous Machine (PMSM) are becoming more popular. The PMSM is superior to induction machines both in ... -
Dynamic analysis and monitoring of power transmission cables using fibre optic sensors
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:203, Doctoral thesis, 2005)Aeolian vibration is a well known phenomen that can occur on overhead power lines in light to moderate steady winds. The amplitude of these vibrations is usually less than the conductor diameter, while the frequency, ... -
High frequency modeling of power transformers: Stresses and Diagnostics
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:30, Doctoral thesis, 2005)In this thesis a reliable, versatile and rigorous method for high frequency power transformer modeling is searched and established. The purpose is to apply this model to sensitivity analysis of FRA (Frequency Response ... -
Wave Energy Conversion: Direct Coupled Point Absorber in Heave with Induction Machine as Power Take Off
(Master thesis, 2007)In the area of offshore renewable, wave energy can give great contribution. There has been research for developing wave energy converters since the late eighteenth century when the first patent was applied for in 1799 [1], ... -
Fundamentals of Grid Connected Photo-Voltaic Power Electronic Converter Design
(Master thesis, 2007)In this master thesis the basic theory of grid connected photo-voltaic systems is explained, giving an introduction to the different aspects of system design. Starting with a look at the standards concerning grid connection ... -
Investigating the Potential of Two Large Diameter Magnetic Bearings
(Master thesis, 2007)MAGNETIC bearings for large diameters and low rotational speeds are rarely developed and utilized due to poor competitive ability. They require little maintenance and offer high reliability, but until now mechanical bearings ... -
Tekniske og økonomiske forhold ved bruk av alternative strukturer i bygningsinstallasjoner
(Master thesis, 2007)Denne rapporten er en vurdering av alternative strukturer i utførelsen av moderne bygningsinstallasjoner. To konkrete bygninger er vurdert, Sentralbygg II (SBII) på NTNUs campus Gløshaugen, og en del av Byåsen Videregående ... -
Klimapåkjenninger og sårbarhet i kraftnett: klimarelatert sårbarhet i norske regional- og distribusjonsnett
(Master thesis, 2007)En rekke alvorlige hendelser har de siste årene ført til økt fokus på sårbarhet. Potensiell sårbarhet har fått stor oppmerksomhet i media i etterkant av for eksempel ekstremvær, store strømbrudd og terrorangrep. Også i ... -
Børsteslitasje i vannkraftgeneratorer
(Master thesis, 2007)Diplomoppgaven er en gjennomgang av laboratorieundersøkelser foretatt i løpet av første halvår 2007 knyttet til børsteslitasje i vannkraftgeneratorer. Det er varierende hvorvidt børsteslitasje oppleves som et problem i ... -
Elektrotekniske forhold i Trondheim kommunes veilysnett
(Master thesis, 2007)Veilyset i Trondheim ble vinteren 2006/07 (særlig høsten 2006) satt under søkelyset som følge av mørklagte gater/veier og mørke veilysarmaturer. Hensikten med denne oppgaven er følgelig å kartlegge status for veilysanlegget ... -
Technical and Economic Analysis of a Power Plant Based on Rice Husk: Optimized generation of power and amorphous silica ash based on controlled rice husk combustion
(Master thesis, 2007)Elkem Materials is in the initial phase of developing rice husk combustion as a business strategy. By burning rice husk under controlled conditions the ash generated is amorphous silica in nature. This amorphous silica ash ... -
Tofase varmeovergang og strømningsfordeling i prosessteknisk utstyr
(Master thesis, 2007)Sammendrag del 1: Institutt for Energi- og Prosessteknikk ved NTNU har inngått et samarbeid med industrien for å utvikle et fordamperkjølerkonsept til smelteovnskjøling. Dette konseptet anvender boblekoking av et høytemperatur ... -
Steady-state and dynamic converter modeling in system analysis
(Master thesis, 2007)This master thesis was executed at the Department of Electrical Power Engineering at the Norwegian University of Science and Technology (NTNU). The thesis was initiated to establish and evaluate an alternative model ... -
Spenningssammenbrudd i Midt-Norge
(Master thesis, 2007)I Midt-Norge er det i dag et stort kraftunderskudd, og på grunn av økende industrilast i regionen forventes det at underskuddet stiger i årene som kommer. Det finnes planer for å etablere ny produksjon i området, men ...