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Transformer terminal equivalents obtained via admittance measurements are suitable for simulating high-frequency transient interaction between the transformer and the network. This paper augments the terminal equivalent approach with a measurement-based voltage transfer function model which permits...

Optimization of hydroelectric power production is often executed for river systems consisting of several powerplants and reservoirs located in the same region. For hydropower stations located along the same river, the release from upstream reservoirs ends up as inflows to downstream stations...

Using wood stoves is a common space-heating strategy in the Nordic countries. The power oversizing of a stove for a given building might deteriorate the indoor thermal environment, for instance with large thermal stratification. This thermal environment is difficult to model and, in practice, a...

Norge er et av landene i verden med størst andel elbiler, og denne trenden er forventet å øke i fremtiden. Hvis nettselskap kan finne ut hvilke områder som har mange elbiler vil det gi nyttig informasjon for planlegging og drift av distribusjonsnettet. Det har internasjonalt blitt gjort en del...

The future electricity grid will be a complex system-ofsystems, incorporating various intelligent devices for monitoring, control and automation. The interaction between various technological, regulatory and social factors add complexity which need to be addressed in a holistic and coordinated way...

For generation of required voltages and controlled energy transfer from fuel cell stacks, appropriate converter topologies are necessary. The stability of the stack against degradation and thus the possible lifetime does not meet the requirements for most applications yet. Dynamic fluctuations of...

We present a perturbation theory that combines the use of a third-order Barker–Henderson expansion of the Helmholtz energy with Miepotentials that include first- (Mie-FH1) and second-order (Mie-FH2) Feynman–Hibbs quantum corrections. The resulting equation of state, the statistical associating...

Both the reliability of natural snow and the number of potential snow production days with traditional snowmaking equipment are decreasing due to a warmer climate. This is especially the case at lower altitudes. To maintain conditions suitable for winter sports close to cities and highly populated...

På Leangen i Trondheim skal det bli bygget et nytt boligområde. Hensikten med denne masteroppgaven er å evaluere hvordan et lokalt lav-temperatur varmenett kan forsyne boligområdet med energi til romoppvarming, produksjon av tappevann og romkjøling. Spillvarme fra en skøytebane i nærheten, samt...

In recent years the need for DC distribution buses has increased considerably. As it can be noticed in the transport for example the distribution systems of the more electric aircrafts, ships, or electric cars. Given the complexities of the systems presented above, the need to use more and more...

This paper presents an assessment of the cost performance of CO₂ capture technologies when retrofitted to a cement plant: MEA-based absorption, oxyfuel, chilled ammonia-based absorption (Chilled Ammonia Process), membrane-assisted CO₂ liquefaction, and calcium looping. While the technical basis for...