The Global Precipitation Climatology Project （GPCP） monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipi...The Global Precipitation Climatology Project （GPCP） monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipitation in China in the period from January 1980 to December 2000. Results expose significantly consistent rainfall distributions between the both data in multi-year mean, multi-year seasonal mean, and multi-year monthly mean. Departures of monthly rainfall for each dataset also show a high correlation with an over 0.8 correlation coefficient. Analysis indicates small differences of both datasets during autumn, winter, and spring, but relative large ones in summer. Generally, the GPCP has trend of overestimating the rainfall rate. Based on above good relationship of both datasets, the GPCP data, are used to represent distributions and variations of precipitation in the Tibetan Plateau and Northwest China. Results indicate positive departures of precipitation in summer in the west part of Tibetan Plateau in the 1980s and negative departures after the 1980s. For the west part of Northwest China, analysis illustrates precipitation decreases a little, but no clear variation tendency.展开更多
基于光伏模块直流物理模型,在PSCAD仿真环境下,开发了光伏阵列仿真模型。此外,考虑到太阳能的波动性和随机性对光伏阵列的影响,开发了最大功率点跟踪(Maximum Power Point Tracking,MPPT)控制器仿真模型,保证光伏阵列在任何当前日照下...基于光伏模块直流物理模型,在PSCAD仿真环境下,开发了光伏阵列仿真模型。此外,考虑到太阳能的波动性和随机性对光伏阵列的影响,开发了最大功率点跟踪(Maximum Power Point Tracking,MPPT)控制器仿真模型,保证光伏阵列在任何当前日照下不断获得最大功率输出。仿真结果表明,搭建的仿真模型能够准确的反映实际物理装置的特性与功能,可以用于光伏发电并网及储能方面的仿真研究。展开更多
基金国家重点基础研究专项(2004CB418304)国家自然科学基金(40675027+4 种基金4017501540375018)国家自然科学基金海外杰出青年基金(40428006)青年科学基金(40605010)Japan International Research Center for Agricultural Sciences
基金Supported by Grants of NKBRDPC (No.2004CB418304),NSFC grant of the Joint Research Fund for Overseas Chinese Young Scholars (No.40428006),NSFC (Nos.40175015 and 40375018).
文摘The Global Precipitation Climatology Project （GPCP） monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipitation in China in the period from January 1980 to December 2000. Results expose significantly consistent rainfall distributions between the both data in multi-year mean, multi-year seasonal mean, and multi-year monthly mean. Departures of monthly rainfall for each dataset also show a high correlation with an over 0.8 correlation coefficient. Analysis indicates small differences of both datasets during autumn, winter, and spring, but relative large ones in summer. Generally, the GPCP has trend of overestimating the rainfall rate. Based on above good relationship of both datasets, the GPCP data, are used to represent distributions and variations of precipitation in the Tibetan Plateau and Northwest China. Results indicate positive departures of precipitation in summer in the west part of Tibetan Plateau in the 1980s and negative departures after the 1980s. For the west part of Northwest China, analysis illustrates precipitation decreases a little, but no clear variation tendency.
文摘基于光伏模块直流物理模型,在PSCAD仿真环境下,开发了光伏阵列仿真模型。此外,考虑到太阳能的波动性和随机性对光伏阵列的影响,开发了最大功率点跟踪(Maximum Power Point Tracking,MPPT)控制器仿真模型,保证光伏阵列在任何当前日照下不断获得最大功率输出。仿真结果表明,搭建的仿真模型能够准确的反映实际物理装置的特性与功能,可以用于光伏发电并网及储能方面的仿真研究。
