The Regionalization Of Wind Resource Over China Offshore

This article reviews the development history of climatic regionalization of China and the achievement and the methods of climatic regionalization of foreign. Starting from the current situation of wind speed datas offshore, Try to calculate and analyze wind resources and maximum winds in a 50-year return period over China offshore combining Marine observation datas and Satellite observations with Climatology and climate statistics.Then, conduct the regionalization of the wind turbines security levels and the wind resource, and the comprehensive regionalization of wind power development over China offshore area. The main results as follows:1. This article contrasts the research, Application and evaluation of many scholars for various satellite wind speed data with consulting literature.Finally choose the CCMP wind speed data which has long period, high precision and complete spatial distribution. In the next moment, the comparison result of CCMP wind satellite speed and ERA reanalysis wind speed shows that the difference between them is relatively small,CCMP wind speed is lower than the ERA in nearshore waters.2. Fifteen selected buoy stations and oil platforms distribute in China offshore (Lack of Jiangsu coastal).They have good regional representative. It comparises the buoy station wind speed data and the CCMP wind speed with 6-hour-period,and calculates the correlation coefficient, wind speed standard deviation and average wind speed difference percentage between them under the conditions of high winds(≥ 11m/s),small winds(<3m/s) and all.As the results:the correlation coefficients are well because all are more than 0.7 and six are more than 0.9. Wind speed standard deviation is between 1.2m/s and 2.3m/s. Average wind speed difference percentages of the half stations are about 10%,it means that the CCMP wind speed is about 10% smaller.3. Monthly average wind speed of CCMP and ICOADS within the scope of China’s offshore 1°×1° grid points from 1988-2011 are comparised and analyzed.The conclusion shows that the pattern of them are same,but there is difference in central Taiwan Srait, Maximum wind speed zone for ICOADS but not for CCMP. Obviously,the situation of CCMP is unreasonable. The difference percentage between ICOADS and CCMP is about 10% to 20% over China offshore but about 40% in Taiwan Strait. Eliminate marine observation instrument installation height which is between 20m and 30m, close to 10% corrected to 10m above the surface. The CCMP wind speed is about 10% smaller than ICOADS.This result is similar as buoy stations.4. Analyze the comparison result synthetically between CCMP wind speed and measured data of buoy stations or ICOADS marine observation wind speed. For the most part in China offshore areas, the correction factor is 10%, but 40% for Taiwan Strait. The CCMP wind speed with correction can make up for the defects of ICOADS wind speed that insufficient data on non-marine routes.5. There is great difference of the maximum wind distributions in a 50-year return period calculated by wind speed data under the influence of TC, ICOADS wind speed data and CCMP wind speed data at the distribution situation and the magnitude.The result of ICOADS is similar with multi-year mean wind speed. The result of the influence of TC can reflect high winds of typhoon,but the credibility is low in north of 30°N.The result of CCMP is similar with the former,but has large disparity at value, especially Zhejiang offshore, the northeast of the South China Sea and southeast of Hainan.6. Combine the maximum wind distributions in a 50-year return period calculated by wind speed data under the influence of TC, ICOADS and CCMP to calculate the maximum winds in a 50-year return period over China offshore.This method can avoid the three data respective limitations and play the advantages of the three kinds of data. The distribution diagram is integrated and credible.7. According to the GB/T 18710-2002:Methodology of wind energy resource assessment for wind farm, regionalize China offshore 5 kinds with wind resources. Then according to the wind turbines security levels of IEC61400-1 divide China offshore into 6 levels. Finally obtain the comprehensive regionalization of wind power development offshore which has 4 primary levels and 9 secondary levels combining multi-year mean wind speed and maximum winds in a 50-year return period.8. The regionalizations of wind resources,wind turbines security levels and wind power development over China offshore fill the gaps of wind development climatic regionalization offshore and provide a scientific basis for wind power development,ship sailing and other Marine development.