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间谐波相序特征和闪变传播特性的研究 被引量:3
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作者 陈利 《陕西电力》 2015年第4期80-86,共7页
随着电力电子等非线性装置和负荷在电力系统中的广泛应用,大量间谐波注入系统。为了提高电网运行的电能质量。有必要对电力间谐波在电网运行中的特点深入研究。针对交直交变流器系统总结了电力谐波和间谐波的相序特征,分析了两者相序特... 随着电力电子等非线性装置和负荷在电力系统中的广泛应用,大量间谐波注入系统。为了提高电网运行的电能质量。有必要对电力间谐波在电网运行中的特点深入研究。针对交直交变流器系统总结了电力谐波和间谐波的相序特征,分析了两者相序特征的不同。在此基础上,研究了单个间谐波和间谐波成对存在时,引起的电压峰值波动和有效值波动。通过实例仿真计算表明基波初相位、间谐波的相序和变压器连接方式会影响问谐波传播的相位关系,从而影响到间谐波的波动闪变效果。本文的研究工作对间谐波的测量和抑制具有指导意义。 展开更多
关键词 间谐波 相序特征 闪变传播特性 交直交变流器 间谐波对
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从城市勘察设计角度对潍坊市区第四系沉积类型进行探讨
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作者 袁希鹏 解尔波 《建设科技》 2017年第5期70-71,共2页
本文从潍坊市区第四系的分布规律及岩性特征出发,结合第四纪冰期、间冰期的沉积环境理论,将第四系沉积物划分为早更新世河湖相沉积;中更新世河流相沉积;晚更新世风成相沉积;全新世近代河流相沉积等四大成因类型,并对每种成因类型进行了... 本文从潍坊市区第四系的分布规律及岩性特征出发,结合第四纪冰期、间冰期的沉积环境理论,将第四系沉积物划分为早更新世河湖相沉积;中更新世河流相沉积;晚更新世风成相沉积;全新世近代河流相沉积等四大成因类型,并对每种成因类型进行了证据的搜集和论述,对今后第四系地质工作具有一定的指导意义。 展开更多
关键词 第四系地层 岩性及相序特征 沉积成因类型
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PROGRAM SLICING BASED ON INTERESTING INDEX 被引量:2
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作者 WuFangjun YiTong 《Journal of Electronics(China)》 2004年第3期255-260,共6页
With the scale of programs becoming increasingly bigger, and the complexity degree higher, how to select program fragments for slicing has become an important research topic. A new type of criterion called interesting... With the scale of programs becoming increasingly bigger, and the complexity degree higher, how to select program fragments for slicing has become an important research topic. A new type of criterion called interesting index is proposed for selecting parts of procedures or procedure fragments to do program slicing. This new criterion considers not only the subjective aspects in users, namely users' emphasis on the time efficiency, storage capacity or readability, but also the objective aspect in large procedures. It also represents the benefit of the users, while displaying the many-faceted roles that program slicing plays. In this way users call proceed with program slicing to large systems or unfinished systems. 展开更多
关键词 Program analysis Program slicing Relative complexity of types Interesting slicing
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Study on Focal Mechanism Changing Characteristics of the 2013 Zogang-Markam Ms6. 1 Earthquake Sequence 被引量:1
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作者 He Chang Zhu Hang 《Earthquake Research in China》 CSCD 2016年第1期13-21,共9页
The M_S6. 1 earthquake was a foreshock-mainshock-aftershock type which occurred in the boundary region between Zogang and Markam counties on August 12,2013. Within 9hours before the main shock seven earthquakes of gre... The M_S6. 1 earthquake was a foreshock-mainshock-aftershock type which occurred in the boundary region between Zogang and Markam counties on August 12,2013. Within 9hours before the main shock seven earthquakes of greater than M_L2. 0 occurred,with a maximum of M_L4. 7. In this paper,the earthquake focal mechanism changing process of the Zogang-Markam M_S6. 1 earthquake sequence is studied by calculating the correlation coefficient of body wave spectral amplitudes,and the result shows that the correlation coefficients of spectral amplitude of foreshocks present high value fluctuation with an average value of 0. 86,which shows that the focal mechanism of foreshocks are similar;and the correlation coefficients of spectral amplitude of aftershocks present low value,which shows that the possibility of a large earthquake is not high after a time. 展开更多
关键词 Zogang-Markam Ms6. 1 earthquake Earthquake sequence Focal mechanismSpectral amplitude correlation coefficient
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基于电压相序突变信息的配电线路单相断线故障方向识别方法 被引量:5
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作者 陈锦荣 李赫 +2 位作者 谭振鹏 朱延廷 梁永亮 《供用电》 2022年第9期35-41,共7页
随着配电线路绝缘化率的提高,断线故障成为配电网常见故障之一。以不接地系统为例,根据单相断线故障模型与中性点偏移电压的分布范围,分析了配电线路发生断线故障时断口前后电压相序的变化特征,发现由于断口后故障相电压由两个健全相电... 随着配电线路绝缘化率的提高,断线故障成为配电网常见故障之一。以不接地系统为例,根据单相断线故障模型与中性点偏移电压的分布范围,分析了配电线路发生断线故障时断口前后电压相序的变化特征,发现由于断口后故障相电压由两个健全相电压合成,断口后电压相序发生改变,而断口前电压相序不变。基于此特征,提出了一种基于电压相序突变信息的配电线路单相断线故障方向识别方法。MATLAB/Simulink仿真表明,所述方法具有不受过渡电阻、负荷大小影响的特点,能够在各种断线形态下可靠识别故障方向。 展开更多
关键词 配电网 不接地系统 单相断线故障 相序特征 故障方向
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