Sökning: "variable power factor"
Visar resultat 1 - 5 av 32 avhandlingar innehållade orden variable power factor.
1. Study of Induction Machines with Rotating Power Electronic Converter
Sammanfattning : This thesis investigates a novel induction machine topology that uses a rotating power electronic converter. Steady-state and dynamic performance of the topology is studied to understand its operational principle. Furthermore the potential of improving its efficiency and power factor is investigated. LÄS MER
2. Wind Power - Added Value for Network Operation
Sammanfattning : This dissertation deals with the investigation on different value added properties of variable speed wind turbines (VSWT) that stem from the flexible controllability of converter interfaced wind turbines (WT). Improvements in voltage and transient stability of a nearby grid, small-signal stability improvement on the power system, frequency control support for the network operation, as well as thetechnical and the economic issues related to the reactive power ancillary service provision, are among the issues covered. LÄS MER
3. Dampening variation in the European Wind Energy System
Sammanfattning : In a future European electricity system, wind power and other variable renewables may constitute a large share of electricity production. This prospect calls for measures to manage the inherent variability of wind power, such as demand-side management, storage, and flexibility of other generation. LÄS MER
4. Market structure and market power : the case of the Swedish forest sector
Sammanfattning : The Swedish forest sector is analyzed, using methods drawing on traditional (forest) market analysis and industrial organization literature. Models based on economic theory are tested empirically with time-6eries data.Paper [1] deals with how the pulp and paper industry manages wood supply risk. LÄS MER
5. Närvarons politik och det mångetniska Sverige. Om att ta plats i demokratin
Sammanfattning : This book delas with the subject of political representation and the significance of the presence of immigrants in the political process. The official stance of the Swedish democracy is that immigrants are to be represented in the political process to the same extent as the rest of the population. LÄS MER