Electricity Distribution by Panagiotis Karampelas & Lambros Ekonomou

Author:Panagiotis Karampelas & Lambros Ekonomou
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

Summer

Winter

Pearson correlation coefficient

Pearson correlation coefficient

Solar versus Demand

0.775

0.452

Wind versus Demand

−0.566

−0.401

Solar and Wind versus Demand (50/50)

0.805

0.442

Solar and Wind versus Demand (12/88)

−0.248

−0.343

The graphical illustration allows a better examination of the daily behaviour of these parameters. In a typical winter day (Fig. 17), the solar availability, which follows the hours of daylight, starts from 8 h, reaches the maximum output between 12 and 13 h, and ends between 18 and 19 h. The output level describes an arc-shaped curve consistent with the Sun intensity during the day, and zero during the night. On the other hand, Wind power shows opposite behaviour, with higher electricity output during the night and a considerable decrease during daytime, which enhances some complementarity between these two sources. Concerning the daily demand curve, it rises substantially from 7 to 10 h, coinciding with he beginning of the day, and maintains a constant value during daytime until 18 h, from which it peaks around 20 h and starts falling up to 40 % of the value, during night-time.

Fig. 17Hourly variation of solar and wind power in a winter day normalized to their maximum value and the normalized electricity demand curve for the maximum peak demand in January 2013

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