A Multi-scale Assessment Method for The Complementary of Wind Power and Photovoltaic Based on Singular Spectral Analysis

Multi-energy complementarity has become an important means to reduce new energy fluctuations and promote consumption. As the hottest renewable energy source, it is of great significance to discuss the complementarity of wind power and photovoltaic. Considering the different response capabilities of different units, this paper studies the multi-scale complementarity assessment of wind power and photovoltaic from the perspective of different change rates. Firstly, according to the output characteristics, the wind and photovoltaic resource data are converted into output data, and then the output is decomposed into three scales of low frequency, medium frequency and high frequency by singular spectrum analysis (SSA). Finally, complementarity assessment of wind power and photovoltaics on different scales is completed based on changes in local fluctuations. The evaluation results can accurately characterize the complementary characteristics of wind and photovoltaic in different scales, and at the same time provide a reference basis for the dispatch and operation of the multi-energy complementary system.