Inproceedings,
Correlations between future wind and solar power generation in Sweden
3rd International Scientific Conference on Energy systems with IT, (March 2010)
Abstract
In fulfilling the European Union's goals for renewable energy expansion, the member states are likely to integrate increasing amounts of renewable electricity generation in the power system. As an intermittent output has to be in- stantaneously balanced by the power system reserve, it is important to investigate the time variability, coincidence and correlations between renewable power sources. Previous studies have mainly focused on wind power, but there is a need to study more types of renewables in combination. This study analyses the time variability and correlations between large amounts of wind and solar power in Sweden. Eight years of hourly irradiation data for all existing Swedish radiation stations were used to construct a scenario for building-integrated photovoltaics (PV) on a national level. Cross-correlations and coincidence with simulated large-scale wind power data for the same years were evalu- ated. It was found that there is a clear negative correlation between solar and wind power on all time scales, from hourly to annual, and that this correlation is particularly strong on monthly time intervals. It is further shown that a combined wind and solar power output has a more evened-out profile than wind or solar alone.
