Undersökning av elkvalitet i distributionsnät med omfattande vindkraftselproduktion

TL;DRAbstract

The goal for this master thesis project has been to investigate the power quality in a\ndistribution grid, which has a high fraction of dispersed power production due to\nwindmills. The study has been done on a grid in Laholm South of Halmstad, where\napproximately 45 windmills are connected to the distribution grid owned by SHK\nEnergi. The investigation has been focused on to two radialy fed 20 kV lines, where\ntwelve windmills are connected.\nVoltage variations have been studied by creating a model of the grid in the simulation\nprogram SIMPOW. The largest deviation that has been found in any point of the grid\nis ±1.9 % of the nominal voltage. This deviation is a result of varying power\ngeneration from the windmills and the voltage regulation at the connection point of\nthe line. If load variations also are considered the largest voltage variation is ±2.4 %.\nThe voltage variations should therefore not cause any real problems.\nThe examination of flicker, which are fast voltage va

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