Grid Capacity and Upgrade Costs

Sammanfattning: In this study the incorporation of a larger wind powerpark in an electrical system is studied. The study is based ona simplified version of an existing grid in J¨amtland, a provincein Sweden, and aims to analyse how to best integrate the windpower regarding geographical, economical and system stabilityfactors. The base system consists of five hydro power plants,four cities, four possible connections of wind power parks and aconnection to the national grid. The study is based on numericalanalysis in MATLAB using data sets of wind strength, powerconsumption in the cities and generation from hydro power plantsin the area. Four days, each representing a season, are consideredand compared to give an insight to how the wind power couldaffect the system during a year. It is shown that wind power canbe integrated in J¨amtland’s grid without affecting the systemnoticeably if building a grid based on 220 kV. For a 130 kV gridthe voltage level instability and losses are significantly increased.With the 220 kV system the voltage variations from the windpowers irregular production are heavily suppressed and insteadthe losses from increased currents becomes the restricting factor.When comparing locations for wind power parks it is shown thatit is more preferable with the wind parks located closer to thecenter of the system where the main consumption lies.