Abstract: The intermittence of renewable energy, such as wind and solar power, reduced their reliability and hence is a huge challenge for tradition energy system to integrate wind and solar power. Different strategies, such as synergy of wind, solar or hydropower as well as distributed wind and solar energy system, batteries, hydrogen etc, were explored to reduce the intermittence of wind and solar powers. However, most of previous studies focused on the short-term variability and the long-term variability of wind and solar attracted less attention, while long-term variability could cause high backup or maintenance cost for the power system. Hence, this study aimed to assess the annual and seasonal variability of wind and solar in China as well as explore the optimal location of wind and solar farms as well as the complementary between solar and wind power to reduce the long-term variability. The reanalysis data (MERRA2) and regional downscaled climate data (East-Asia CORDEX) was used to assess the annual and seasonal variability of wind and solar in China. The effectiveness of distributed wind and solar farms systems in reducing their variability was quantified. We found the annual variability of wind power reaching 40% and seasonal variability as high as 50%. The distributed wind and solar can effectively reduce the annual and seasonal variability. The analysis of solar power is on the way.
Acknowledge: This work was supported by ” Hundred Talent Program” of Chinese Academy of Sciences” .