Quantitative evaluation on consistency and complementarity of wind power variability

Compared with traditional energy sources, wind power generation possesses advantages in energy saving and emission reduction, however, insufficient understanding of mutual variation properties of wind power limits the development and application of wind power to certain extent. According to the variation properties of wind power itself, the stationarity index is defined to evaluate the fluctuation extent of wind power or that of load power; for mutual variation properties; the consistency index is defined to evaluate the consistency of variation between power sources and the consistency of variation between energy source and load; the complementarity index is defined to evaluate the complimentary ability between power sources and the complimentary ability between power source and load, and to describe mutual variation properties common with consistency index, in addition sub-indices considering the variation direction are defined. The defined indices are compared with correlation coefficient and simultaneity index. Using the proposed indices, the stationarity, consistency and complementarity of the variability of load power and wind power among three wind farms located in the same region are calculated, thus the quantitative evaluation on variation characteristics of wind power under different conditions is implemented. The evaluation results based on the proposed indices are available for reference to the comparison among various kinds of power source characteristics and can offer information to guide the operation of wind farms.