TAILIEUCHUNG - Wind Power 2011 Part 11

Tham khảo tài liệu 'wind power 2011 part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Variability and Predictability of Large-Scale Wind Energy in the Netherlands 285 In addition the 15-minute average wind speeds at the wind farm locations foreseen in the Netherlands for the period of one year were considered. It is found that on three days the wind speed exceeds 25 m s in at least one location. Day 222 was selected for further analysis the wind speeds are presented in figure 19. It should be noted that the wind speed does not exceed 25 m s at all wind farms so that not all wind farms shut down. As shown in figures 20 and 21 with the abrupt shut-down strategy there are large differences between the forecasted and the produced wind power and as a consequence larger imbalances. With the gradual shut-down strategy the differences are significantly less. It was found that with gradual shut-down the imbalance due to forecasting errors is reduced by more than 50 as compared to abrupt shut-down. In addition benefits in terms of decreasing the variability in the wind power output can also be observed in figure 20. Power realisation and forecast in the case of 2 shutting down strategies Fig. 20. Wind power production and forecast during the day with wind speeds over 25 m s and after applying the abrupt and gradual shut-down strategies Fig. 21. Remaining forecast imbalance during the day with wind speeds over 25 m s and after applying the abrupt and gradual shut-down strategies 286 Wind Power The concept of shutting down the wind farm gradually as a linear function of the high wind speed is therefore found to be significantly better than abrupt shut-down. 8. Summary A statistical interpolation method to generate time series of system- and participant-aggregated wind power production and forecast values has been presented. The method takes into account the spatial and temporal correlations among multiple sites as derived from the measurement and forecast data. In addition a method for deriving park-aggregated power curves with smooth cut-in and cut-out that .

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