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The Online Assessment of Electric Distribution Network Load Capability
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作者 Haoming liu zhenkun li +1 位作者 Kun Yu Xingying Chen 《Journal of Electromagnetic Analysis and Applications》 2009年第1期42-47,共6页
To improve the security and reliability of a distribution network, several issues, such as influences of operation con-strains, real-time load margin calculation, and online security level evaluation, are with great s... To improve the security and reliability of a distribution network, several issues, such as influences of operation con-strains, real-time load margin calculation, and online security level evaluation, are with great significance. In this pa-per, a mathematical model for load capability online assessment of a distribution network is established, and a repeti-tive power flow calculation algorithm is proposed to solve the problem as well. With assessment on three levels: the entire distribution network, a sub-area of the network and a load bus, the security level of current operation mode and load transfer capability during outage are thus obtained. The results can provide guidelines for prevention control, as well as restoration control. Simulation results show that the method is simple, fast and can be applied to distribution networks belonged to any voltage level while taking into account all of the operation constraints. 展开更多
关键词 Distribution Network Online Security Assessment LOADING CAPABILITY Variable STEP-SIZE REPETITIVE Power Flow LOAD TRANSFER
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基于微电网的分布式电源并网规划研究
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作者 张彦 李丽娟 +3 位作者 马杰 高华 李振坤 符杨 《智能电网(汉斯)》 2015年第3期111-122,共12页
新能源的迅速发展,使得大电网与分布式电源矛盾加剧.为了充分挖掘分布式电源为电网和用户所带来的价值和效益,微电网应运而生。微电网集成多个DG为一功率稳定的独立系统,有效解决了大规模DG的接入问题,其作为对单一大电网的有益补充,具... 新能源的迅速发展,使得大电网与分布式电源矛盾加剧.为了充分挖掘分布式电源为电网和用户所带来的价值和效益,微电网应运而生。微电网集成多个DG为一功率稳定的独立系统,有效解决了大规模DG的接入问题,其作为对单一大电网的有益补充,具有广泛应用的巨大潜力。本文根据微电网应用环境的不同对其进行了分类,分析了其不同的功能需求,提出了微电网的规划设计原则,列举了常用的微电网结构形式,并对微电网内电源的规划进行了阐述。最后,对一个实际算例进行仿真,仿真结果对微电网分布式电源并网规划提供了参考。 展开更多
关键词 微电网 规划设计 微电网结构 电源规划 分布式电源
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Evaluation of the Trend Uncertainty in Summer Ozone Valley over the Tibetan Plateau in Three Reanalysis Datasets 被引量:14
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作者 Dong GUO Yucheng SU +5 位作者 Xiuji ZHOU Jianjun XU Chunhua SHI Yu liU Weiliang li zhenkun li 《Journal of Meteorological Research》 SCIE CSCD 2017年第2期431-437,共7页
Trend uncertainty in the ozone valley over the Tibetan Plateau(OVTP)and the South Asian high(SAH)during1979–2009 in ERA-Interim(interim reanalysis data from the ECMWF),JRA-55(55-yr reanalysis data from the Jap... Trend uncertainty in the ozone valley over the Tibetan Plateau(OVTP)and the South Asian high(SAH)during1979–2009 in ERA-Interim(interim reanalysis data from the ECMWF),JRA-55(55-yr reanalysis data from the Japan Meteorological Agency),and NCEP-CFSR(Climate Forecast System Reanalysis)datasets was evaluated.The results showed that the NCEP-CFSR OVTP became strong in the summers of 1979–2009,whereas it became weak according to ERA-Interim and JRA-55.Satellite data merged with TOMS(Total Ozone Mapping Spectrometer)and OMI(Ozone Monitoring Instrument)agreed with the OVTP trend of NCEP-CFSR.The OVTP strengthening in NCEP-CFSR may have been caused by SAH intensification,a rising tropopause,and increasing ozone over non-TP(non-Tibetan Plateau)areas(27°–37°N,〈75°E and〉105°E).Analogously,the OVTP weakening in ERA-Interim and JRA-55 may have been affected by weakening SAH,descending tropopause,and decreasing non-TP ozone. 展开更多
关键词 uncertainty trends ozone valley over the Tibetan Plateau South Asian high tropopause height
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