This paper reports the results from a survey conducted in 2010/2011 among 14 Norwegian distribution system operators (DSOs) concerning their experiences with integration of distributed generation (DG) in distribution networks. The survey shows what kind of problems DSOs experience caused by DG...
An jet in cross-flow (JICF) of air is studied using three-dimensional direct numerical simulation with and without chemical reaction in order to investigate the role of the complex JICF turbulent flow field in the mechanism of fast fuel-oxidant mixing and of aerodynamic flame stabilization in the...
The amount of wind power and other timevariable non-dispatchable renewable energy sources (RES) is rapidly increasing in the world. A few power systems are already facing very high penetrations from variable renewables which can surpass the systems' consumption during no-load periods, requiring the...
Cleanliness is considered as one of the most important factors for ensuring long endurance of HV and EHV XLPE cable insulation. Organic contaminants as oxidized XLPE fragments are difficult to completely remove during cable production. Such contaminants can either origin as inclusions in PE granules...
In Zeiten steigenden Energiebedarfs für Kühl- und Klimatisierungsanwendungen ist die Untersuchung alternativer, nachhaltiger Konzepte zur Kälteerzeugung lohnenswert. Energiequellen wie die Solarstrahlung können helfen, die Belastung von Umwelt und Energienetzen zu reduzieren. Solarstrom aus...
Das Gemisch aus Wasser, Additiv und Eispartikeln wird im Allgemeinen als Eisbrei bezeichnet. Als Kälteträger bringt Eisbrei im Vergleich zu einphasigen Kälteträgern viele Vorteile mit sich. So ist die Energiedichte aufgrund der im Phasenübergang gespeicherten latenten Wärme bis zu sieben Mal höher...
The large remote offshore wind clusters that are planned in the North Sea will most likely be connected with a meshed HVDC grid. Power will mostly flow from the offshore wind clusters to shore, creating asymmetrical requirements for the HVDC links that will consist of several parallel HVDC systems...
It will be important for the operation of future multi-terminal HVDC systems that each converter unit is capable of limiting the influence of nearby AC faults on the DC grid. Thus, the local control systems at each terminal should be able to prevent double frequency active power oscillations...
Wood stoves are attractive for the space-heating (SH) of passive houses. Nevertheless, there are still questions about their integration. Firstly, the power oversizing of the current stoves and their long operating time may lead to unacceptable overheating. Secondly, it is also unclear how one stove...
Heat exchangers are important units in most industrial processes. They involve physical phenomena such as condensation and evaporation including several boiling regimes. Different types of heat exchangers constructed for different applications may differ much in geometrical design. This work...
This paper presents results from water tree ageing experiments of XLPE cables exposed to both voltage stress and mechanical tension. The main purpose was to examine possible water tree enhancement due to dynamic mechanical tension forces, likely to occur in power cables connected to floating off...