A review on the complementarity between grid-connected solar
• The paper proposes an ideal complementarity analysis of wind and solar sources. • Combined wind and solar generation results in smoother power supply in many places.
The review of the techniques that have been used to evaluate the complementarity of solar and wind energy systems shows that traditional statistical methods are mostly applied to assess complementarity of the resources, such as correlation coefficient, variance, standard deviation, percentile ranking, and mean absolute error.
The proposed approach enables a detailed differentiation of scales on which the complementary use of wind and solar is possible. The highest potential for complementarity within and between the analyzed regions was quantified at the seasonal scale.
On all other scales studied, including daily and inter-annual scales, the potential for wind-solar complementarity is significantly lower with wind and solar being usually very weakly anti-correlated or being uncorrelated. On these scales, there is hardly any compensation of times with low solar resource by the wind resource and vice versa.
However, improvements in the exploitation of wind-solar complementarity must be accompanied by a massive improvement in the provision and use of energy storage systems. It is understood that different kinds of storage devices mitigate periods of low wind-solar availability .
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