关键词: 对比分析, 平均风速, 风向风速频率, 风功率密度, 风电后评估

Abstract: A comprehensive post-assessment of a wind farm in Inner Mongolia is performed based on contrast analysis. The assessment aspects include average wind speed, wind direction frequency, maximum wind speed, wind speed frequency, hours of effective wind speed and variation of wind power concentration. By comparing assessment factors in two different stages, the research shows that annual average wind speed and average maximum wind speed of the weather station decrease. The decrease rates are -0.015 and -0.185 respectively. Predominant wind direction, which is SSE, stays same. The rate of calm wind is lower by 21.6 percent. The decrease of average wind speed is about 0.8 m/s. The wind speed decrease 10 percent during day and 12 percent during night. The hours of effective wind speed in three wind speed rang lowered 263 h, 533 h and 925 h. The peak wind speed frequency decrease from 6.5~7.5 m/s to 4.5~5.5 m/s. Wind power concentration and wind speed change are similar. In January, wind power concentration is similar to months of second half in the year. The decrease of wind power concentration is more obvious for other months excluding May. The peak wind speed area decrease from 14.5~16.5 m/s to 9.5~10.5 m/s.

Key words: contrast analysis, average wind speed, wind speed and wind direction frequency, wind power density, wind power post- assessment