Results 11 to 20 of about 215,177 (206)
Guangtongxin yanjiu, 2013 利用模糊数学理论对光网络中的多故障定位问题进行分析,得到了光网络中多故障定位的模糊聚类模型。根据由模糊聚类算法得到的专家系统和由此确定的告警和故障之间的隶属函数公式进行故障定位。在格状光网络拓扑下进行多故障定位仿真实验,得出故障定位成功率的对比图和时间性能的对比图。实验结果表明,模糊聚类算法可以高效快速地定位故障。
宋继恩 +6 more
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, 2023 为提升远海风电对称双极柔性直流送端交流系统单相接地故障和两相短路故障工况（第一类故障）下的功率输送能力，以及三相接地故障工况（第二类故障）的交流电压稳定性，提出海上换流站协调控制策略。首先分析了第一类故障的过电压和极间环流产生机理，以及第二类故障的交流电压失稳机理。在此基础上，提出了功率平衡控制策略和输出有功电流策略。第一类故障下定电压控制极采用限压策略，功率平衡控制策略抑制极间环流，增大定电压控制极的功率，减少了交流电压控制器响应时间，提升了功率输送能力。第二类故障工况下 ...
黄海 +4 more
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适用于直流配电网故障选线的电力电子变压器分步闭锁方案 [PDF]
, 2023 级联H桥型电力电子变压器（power electronic transformer with cascaded H-bridge，CHB-PET）是柔性变电站的重要组成设备之一，在直流配电网中具有重要作用。当CHB-PET低压直流侧发生双极短路故障后，故障电流上升速度快且幅值较高，易导致电力电子器件迅速闭锁，使低压直流电网保护难以准确获取故障信息。针对CHB-PET低压侧多分支直流配电网，提出一种基于PET分步闭锁的故障穿越策略。当检测到PET低压侧直流系统故障后 ...
于弘洋 +5 more
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Journal of Diabetes, Volume 15, Issue 12, Page 1048-1069, December 2023., 2023 Highlights We identified that CGM can increase motivation for self‐management and confidence in treatments. A supportive treating team may help to reduce the practical and psychological burden in patients with type 1 and type 2 diabetes. Abstract Aims Blood glucose control is central to the management of diabetes, and continuous glucose monitoring (CGM)
Patrizia Natale +10 more
wiley +1 more source
Supporting conservationists’ mental health through better working conditions
Conservation Biology, Volume 37, Issue 5, October 2023., 2023 Abstract Biodiversity conservation work can be challenging but rewarding, and both aspects have potential consequences for conservationists’ mental health. Yet, little is known about patterns of mental health among conservationists and its associated workplace protective and risk factors.
Thomas Pienkowski +14 more
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JAPAN ARCHITECTURAL REVIEW, Volume 6, Issue 1, January–December 2023., 2023 This study examined the impact of the Plan for Ōsaka, 1899 by Hanroku Yamaguchi on the urbanization of the Ōsaka Port Reclaimed Area. Abstract This study examined the impact of the Plan for Ōsaka, 1899 by Hanroku Yamaguchi on the urbanization of the Ōsaka Port Reclaimed Area.
Junne Kikata, Kouki Yoshimoto
wiley +1 more source
Journal of Sociolinguistics, Volume 25, Issue 3, Page 438-452, June 2021., 2021 Abstract Speakers of pathologized speech have not received much attention from sociolinguists. This article explores the stylistic practices of deaf and hard‐of‐hearing (DHH) people who demonstrate pathologized variants. This article adopts minimal pair reading and story reading to elicit various stylistic practices, as part of a larger project that ...
Tsung‐Lun Alan Wan
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Dianci bileiqi, 2022 目前，我国城市中低压配电网电容电流骤增且消弧线圈补偿能力不足问题突出，为解决由此带来的单相接地故障电弧难以自熄问题，故障相接地消弧技术在配电网逐渐开展试用，故障相准确辨识是该技术可靠熄弧的基础。本研究分析故障后三相电压暂态信号，得到故障相暂态电压波形与非故障相极性相反的特征，提出利用故障相和非故障相暂态电压波形相似度判断故障相的方法；采用Matlab&Simulink建立10 kV典型配电网模型和电弧故障模型，并在不同中性点接地方式下改变过渡电阻、故障点距离、故障相角、间歇性接地等弧光接地故障条件 ...
李景丽 +4 more
doaj
全球能源互联网, 2019 光伏电站采用直流汇集方式能够解决采用交流汇集方式时的宽频域振荡问题和线路损耗大的问题，但是现有文献对直流升压汇集系统的故障特性特别是断线故障特性研究很少。针对基于IPOS结构的直流升压变换器单元的光伏直流升压汇集系统，提出了系统断线故障发展过程中，非故障线路上存在故障电流的特性。首先，分析了非故障线路上故障电流产生的机理；其次，按照故障点位置的不同，对故障电流引起的系统电压电流变化特性进行了分析，并推导了故障电流的计算表达式；再次，从继电保护的角度分析了故障电流对直流升压汇集系统的影响；最后 ...
宋晓梅 +5 more
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基于MEEMD和SVM的贯通式同相牵引直接供电系统牵引网故障识别
Dianci bileiqi, 2021 针对贯通式同向牵引直接供电系统牵引网故障识别,提出了一种基于改进总体平均经验模态分解和支持向量机的故障识别方法。利用PSCAD仿真平台搭建3种不同类型(雷击故障,雷击干扰,接地故障)的故障模型,通过模拟仿真得到故障暂态电流,并对其解耦得到故障电流相模分量。采用MEEMD算法对故障电流相模分量进行分解,提取特征向量,通过SVM工具箱进行故障识别。为了验证SVM在故障识别中的优越性,通过对比概率神经网络故障识别,结果表明SVM在故障识别中具有更高的正确率。
庄启康 +4 more
doaj