Tham khảo tài liệu 'data acquisition part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Wind Farms Sensorial Data Acquisition and Processing 201 a Power Curve. Left wind turbine n. 3 right wind turbine n. 8 b Active power versus low shaft velocity c SVM classification for Power curve Fig. 16. SVM classification of a wind farm according to equation 5. Red breakdown. Green good operation Fonseca 2010 . 202 Data Acquisition a Power curve. Left Wind turbine n. 3 right wind turbine n. 8 b SVM classification for Active power versus low shaft speed c SVM classification of Fig. 17 b transposed to the power curve Fig. 17. SVM classification of a wind farm according to equation 6. Red breakdown. Green good operation Fonseca 2010 . Wind Farms Sensorial Data Acquisition and Processing 203 Additionally the second method classifies identically to the first. To overcome this problem it is necessary to relax restrictions on the right graph of Fig. 17 b . The data indicated belongs to a wind farm in which there is not relevant information to determine surely to what situation applies. PTP synchronization This section presents results for PTP Synchronization. Experiences have also been made with two modifications in the PTP protocol in particular changing the messages Sync and Follow Up to include the value of the master clock time. Fig. 12 shows a block diagram of the text described for the modifications made to PTP master software. The results show a faster initial convergence due to the decrease of initial error but in subsequent periods is normal. Matlab simulation and experimental setup has been used to collect results and the experimental work confirms theoretical simulation. The error update of CNT_TICK_MAX used in experiments is based on the mean of last two error samples times . A 90000 threshold has been applied on this error. Fig. 18 outline the simulation through large seconds. It can be observed the convergence of the clocks and after 50 timing messages at the end a maximum deviation of 50 ns exists. In this experiment it was considered two decimal
