Wind Power Fluctuation Characteristics of Wind Farms

Abstract

The purpose of this paper is to research wind power fluctuation character of the wind farm.First, the qualitative and quantitative analysis methods are combined.Sliding difference algorithm is used to construct wind power fluctuations evaluation system.Calculating wind power fluctuations value volatility characteristics evaluation system at different time scales, we can get the conclusion that the optimum distribution form of distributed wind power fluctuations is t-location scale.Secondly, taking into account the wind power is non-linear, non-stationary characteristics of the data signal.This feature is fully in line with the wavelet neural net data analysis features.Therefore, the choice of wavelet neural network is learning and training and testing, and thus the total power of the future wind farms are amid to predict.And the research will predictive value as new learning data, for seven days after the wind power rolling forecasts.Then, comparative analysis of single units and the whole wind turbine power fluctuation characteristics obtained differences coverage under the volatility characteristic index wind power, and further understanding of volatility characteristic of wind power.The influence of temporal and spatial distribution and other factors, single wind turbine there is a big difference between the output power fluctuation characteristics of the wind farm, which is due to the presence of different turbine wind farm suffered difference, and wake effects between units, making the distribution of the frequent fluctuations in power.With respect to a single unit-He said fluctuation entire wind farm is more gentled, that with the increase in the spatial distribution of scale, fluctuating wind power presents a certain "Gentle Effect".Finally, the analysis overcome the adverse effects of wind power fluctuations on the grid operation, prepare the following specific solutions: rational allocation of energy storage devices, expanding the coverage area of the wind farm, or to improve the design of the windmill, so that wind farms can adapt to different directions wind, and you can try to eliminate the impact of fluctuations in the energy storage device by the wind farm output power to the grid, covering the area of large wind farms can adapt to different wind power complement each other, we have reached a stable amount of purpose into the grid.