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Hydropower is the largest renewable energy source available in today's society. Operation and production is handled by high-tech electronics. This thesis is done on behalf of Statkraft Sweden AB who wants to explore the possibility of replacing the hydraulic cylinder with an …
… of the deregulation of the electricity market 1996 in Sweden on short-term hydropower regulation are unknown. This report investigates patterns in subdaily regulation in the Ångerman River Basin during the period 1993-2011. Differences in subdaily flows and zero flow events …
Har elmarknadens avreglering påverkat regleringsintensiteten?
… of the deregulation of the electricity market 1996 in Sweden on short-term hydropower regulation are unknown. This report investigates patterns in subdaily regulation in the Ångerman River Basin during the period 1993-2011. Differences in subdaily flows and zero flow events …
… and validate a Power System Stabilizer (PSS) to a generator at Trängslet hydropower station in Dalarna, Sweden. Problems with local rotor oscillations can occur at the hydropower station when power is transferred on a new power line (130 kV) from Northern to Southern part of …
Small hydropower plants have been an important source for electricity for many years. During the 70?s the general thought was that nuclear was the future. Around 2000 small waterpower plants were shut down. It wasn’t profitable to invest in. But now, over 30 years later, society …
… an automatic fault detection system for surveillance of bearing temperature in hydropower turbines. The parameters used except the bearing temperature were cooling water temperature and cooling water flow. A simple static model based on data sampled every minute was developed to …
… create scour of the material in the channel. Usually, for spillways in Swedish hydropower plants, this material is rock and the scour is in form of rock blocks. Scour downstream of dams can in the worst case endanger the dam construction. The purpose of this study was to …
Denna rapport sammanställer vattenhydraulikens möjligheter samt fördelar och nackdelar vid konvertering av befintliga hydraulsystem, eller nya anpassade system inom vattenkraften. Dessutom ska en jämförelse mellan miljöpåverkan av olja jämfört med vatten som behandlats för att …
… of the report describes the Nordic power market, production planning of hydropower plants and regulation power. A case study has been performed with the purpose to understand how the new demands and the strategy developed in this report might influence the regulation bids. The …
Vattenkraftstationer, med dammar och turbiner, utgör hinder för nedströmsvandrande smolt. Syftet med denna studie var att undersöka turbindödligheten för öringsmolt (Salmo trutta) vid två kraftstationer, de befintliga ytlänsarnas avledningseffekt och om effekten kunde förstärkas …
Kraftindustrin arbetar oavbrutet med att försöka höja och upprätthålla dammsäkerheten i Sverige. Erosionsskydd för fyllningsdammar skall dimensioneras och utformas så att de medverkar till en god dammsäkerhet. Vid dimensionering och projektering av erosionskydd måste …
… describes a method of measuring axial magnetic leakage flux in an operational hydropower generator. Axial magnetic leakage flux is the magnetic flux at the ends of a rotating generator, which goes through the stator parallel to the rotor axis. This flux can cause circulating …
… of the river has been made to supply a growing human population with food, hydropower, and to reduce the risk of flooding. These changes have resulted in a degraded habitat for the porpoise. A major problem is that the species natural behaviour and morphological adaptions to a …
att skapa ett hållbart fiske med hög kvalitet
… land. The entire Ammerån is today a nature reserve and protected from hydropower development. Fishing in Ammerån has mainly been focused on trout and grayling, and is so even today. There are many indications that the grayling and trout stocks declined if compared to the data …
Due to historically low prices for electricity in Sweden, many small-scale hydropowerplants were closed down. A small-scale power plant has more or less the samemaintenance costs as larger plants, but doesn’t generate as much income. Today?sincreasing price for electricity in …
