| 基于光传感器的输电线路盐密在线监测系统设计 |
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| 引用本文： | 王国胜,高广德,李洪涛,刘敬之. 基于光传感器的输电线路盐密在线监测系统设计[J]. 水电能源科学, 2013, 31(8): 170-172 |
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| 作者姓名： | 王国胜 高广德 李洪涛 刘敬之 |
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| 作者单位： | 华南农业大学 水利与土木工程学院， 广东 广州 510642;华南农业大学 水利与土木工程学院， 广东 广州 510642;华南农业大学 水利与土木工程学院， 广东 广州 510642;广东省水文局， 广东 广州 510150 |
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| 基金项目： | 国家自然科学基金资助项目（41171029）；广东省水利科技创新基金资助项目（2009 42）；华南农业大学校长科学基金资助项目（7600 K07050） |
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| 摘 要： | 采用Mann Kendall检验法和重标极差法（R/S）分析了泗合水流域1965~2010年全年及年内各时期的降雨量、蒸发量和径流量时间序列变化趋势及其持续性，分离和估算了气候变化和人类活动对径流的影响。结果表明，径流变化受人类活动的影响，但不足以颠覆最大月和旱季两个极端时期的降雨变化趋势。以径流系数突变年份2003年为界，显著变化期与平顺变化期相比，多年平均降雨量和蒸发量分别减少了73、34 mm，径流量却减少200 mm；并根据平顺变化期的降雨—径流相关关系，估算出显著变化期气候变化与人类活动对径流减少的贡献率分别为33.5%、66.5%。
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| 关 键 词： | 径流变化； 趋势分析； 持续性； 气候变化； 人类活动影响 |
Variation Trend of Runoff and Influencing Factor Analysis in Siheshui Basin |
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| WANG Guosheng,GAO Guangde,LI Hongtao and LIU Jingzhi. Variation Trend of Runoff and Influencing Factor Analysis in Siheshui Basin[J]. International Journal Hydroelectric Energy, 2013, 31(8): 170-172 |
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| Authors: | WANG Guosheng GAO Guangde LI Hongtao LIU Jingzhi |
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| Affiliation: | College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China;Hydrology Bureau of Guangdong Province, Guangzhou 510150, China;College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China;Hydrology Bureau of Guangdong Province, Guangzhou 510150, China;College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China;Hydrology Bureau of Guangdong Province, Guangzhou 510150, China;College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China;Hydrology Bureau of Guangdong Province, Guangzhou 510150, China |
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| Abstract: | In order to reduce the influence of large amount of wind power access on the small interference stability of power system, this paper studies the DFIG that is configured stabilizer (DFIG-PSS) to suppress low frequency oscillation. A practical DFIG-PSS parameter tuning program is designed. The suppressing low frequency oscillation of power system is achieved by improving the damping. For four machine two area system, time domain simulation and modal analysis is conducted by using Matlab software. Finally, the power oscillation amplitude is compared before and after configuration of DFIG-PSS. The results show that the system with wind power configuration of DFIG-PSS and optimization PSS parameters can increase the damping ratio of the system and enhance the ability of suppressing low frequency oscillation of power system. |
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| Keywords: | variation of runoff trend analysis persistence climate change human activities |
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