Coordinated Control Strategy of Wind-Photovoltaic Hybrid Energy Storage Considering Prediction Error Compensation and Fluctuation Suppression

To improve the accuracy of wind power forecasting and suppress wind power fluctuations, a coordinated control strategy of wind-photovoltaic hybrid energy storage considering prediction error compensation and fluctuation suppression is proposed. Firstly, the target region of compensating prediction error and smoothing fluctuations is established by utilizing the statistical probability distribution to analyze the prediction error and power fluctuation. The charging / discharging reference power of the target domain for compensating prediction error is determined based on the upper and lower limits of the allowable prediction error while the charging/discharge reference power of the target domain for smoothing fluctuations is determined through first-order low-pass smooth filter curve. Then, power allocation is carried out based on spectrum analysis. The hybrid energy storage batteries are divided into four groups based on the target domain, so to realize the control of compensating prediction error and smoothing fluctuations in different working conditions. Finally, a wind farm is taken as an example to analyze the calculation example, and the result shows the effectiveness of the proposed strategy.