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有载分接开关绝缘油中金属颗粒运动规律及其对介电性能的影响

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南方电网技术 2024年第5期18卷 1-11页

作者：鲁沛乐严英杰刘亚东江秀臣上海交通大学智慧能源创新学院上海200240 上海交通大学电气工程系上海200240

高压有载分接开关油室金属微粒放电引发的缺陷超一半以上严重影响长期运行可靠性。研究了有载分接开关断开过程中绝缘油中金属颗粒的运动规律及其对绝缘油介电性能的影响,可为有载分接开关绝缘状态诊断和油隙绝缘裕度设计提供理论基础... 详细信息

高压有载分接开关油室金属微粒放电引发的缺陷超一半以上严重影响长期运行可靠性。研究了有载分接开关断开过程中绝缘油中金属颗粒的运动规律及其对绝缘油介电性能的影响,可为有载分接开关绝缘状态诊断和油隙绝缘裕度设计提供理论基础。首先分别给出了流体场、金属颗粒动力学以及电场的理论分析,并阐述了三者的耦合关系;同时建立有载分接开关触头二维简化仿真模型,得到了流体场中涡流的分布、金属颗粒的运动规律以及带电金属颗粒的运动轨迹;仿真结果表明开关运动过程中,开关间隙中心处颗粒浓度最高,且会形成“小桥”。通过混合物的介电常数和电导率模型计算了金属颗粒浓度分布变化对绝缘油介电性能的影响,提出了按浓度分区计算再并联的方法,提高了介电参数计算的准确性。

关键词：有载分接开关金属颗粒运动规律介电性能

三维软件技术在自由曲面建筑设计中的应用——以益阳市科技馆为例

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当代建筑 2024年第4期 131-135页

作者：刘亚东付轶飞中国建筑设计研究院有限公司本土设计研究中心

本文介绍了三维软件技术在自由曲面建筑设计中的应用,对建立形体控制体系,以及拱形钢架、双层表皮、金属幕墙、清水混凝土、玻璃幕墙等方面的深化设计难点及解决方案进行了详细的论述,希望对类似复杂建筑的设计提供一定参考。

关键词：三维软件技术自由曲面曲面重构双层表皮清水混凝土

Risk Management of Weather-related Failures in Distribution Systems Based on Interpretable Extra-trees

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Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 1868-1877页

作者： Ying Du yadong liu Yingjie Yan Jian Fang Xiuchen Jiang Department of Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Guangzhou Power Supply Bureau Co. Ltd.Electric Power Test InstituteGuangzhou 510000China

Weather-related failures significantly challenge the reliability of distribution systems. To enhance the risk management of weather-related failures, an interpretable extra-trees based weather-related risk prediction model is proposed in this study. In the proposed model, the interpretability is successfully introduced to extra-trees by analyzing and processing the paths of decision trees in extra-trees. As a result, the interpretability of the proposed model is reflected in the following three respects: it can output the importance, contribution, and threshold of weather variables at high risk. The importance of weather variables can help in developing a long-term risk prevention plan. The contribution of weather variables provides targeted operation and maintenance advice for the next prediction period. The threshold of weather variables at high risk is critical in further preventing high risks. Compared with the black-box machine learning risk prediction models, the proposed model overcomes the application limitations. In addition to generating predicted risk levels, it can also provide more guidance information for the risk management of weather-related failures.

关键词： Extra-tree machine learning interpretability weather-related failure distribution system

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装配式主变基础受力性能有限元分析

特种结构 2024年第1期41卷 103-109页

作者：刘亚东韩力吕海刚黑龙江华装清配建筑科技有限公司内蒙古电力建设(集团)有限公司宁夏天源电力勘测设计咨询有限公司宁夏平罗凌云建材实业有限公司

本文介绍了一种新型装配式电力主变基础,通过有限元分析考察了该装配式主变基础在使用阶段、偏心加载和地震作用下的各部件应力、结构变形及混凝土损伤情况,并对结构的极限承载能力进行分析,为该工程项目的实施提供设计依据,同时为此类... 详细信息

本文介绍了一种新型装配式电力主变基础,通过有限元分析考察了该装配式主变基础在使用阶段、偏心加载和地震作用下的各部件应力、结构变形及混凝土损伤情况,并对结构的极限承载能力进行分析,为该工程项目的实施提供设计依据,同时为此类结构的有限元建模分析提供参考。

关键词：装配式基础主变基础无限元边界无粘结预应力有限元分析

Penetrating power characteristics of half-wavelength AC transmission in point-to-grid system

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Journal of Modern Power Systems and Clean Energy 2019年第1期7卷 123-130页

作者： Hanqing LIANG yadong liu Lei WAN Gehao SHENG Xiuchen JIANG Department of Electrical Engineering Shanghai Jiao Tong University Global Energy Interconnection Development and Cooperation Organization

With the proposed concept of global energy interconnection, half-wavelength alternating current transmission(HWACT) technology becomes of more *** lines can be adopted to establish a pointto-grid system, in which the penetrating power(PP) is produced between receiving terminals, having a significant effect on the power flow *** order to investigate this phenomenon, the PP characteristics of the HWACT system are researched in this ***, the mathematical relationship between the transmission power and terminal bus voltages of a single HWACT line is derived using the equations of a distributed parameter *** research indicates that the relationship between power and terminal voltages shows ‘‘reverse characteristics"opposite to those of regular short transmission ***, the concept and definition of PP in a point-to-grid system with two receiving terminals are proposed, and the corresponding relationship between PP and the terminal bus voltages is *** are carried out to validate the theory under different conditions, so that the accuracy and adaptiveness of the theoretical analysis can be *** addition, the results demonstrate that selecting the location for a HWACT system has demanding requirements in order to control the value of PP.

关键词： Half-wavelength alternating current transmission(HWACT) Ultra-high voltage Synchronous power grids Penetrating power(PP)

ZnO hierarchical aggregates： Solvothermal synthesis and application in dye-sensitized solar cells

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Nano Research 2013年第6期6卷 441-448页

作者： Jianxing Shi Yunxin liu Qing Peng yadong Li Department of Chemistry Tsinghua University Beijing 100084 China

ZnO hierarchical aggregates have been successfully synthesized by solvothermal methods through reaction of zinc acetate and potassium hydroxide in methanol solution. The shapes of the aggregates were controlled by varying the ratio of Zn2~ and OH- ions in the reaction system, while the size can be tuned from 2μm to 100 nm. Oriented attachment was found to be the main mechanism of the three-dimensional assembly of small ZnO nanocrystallites into large aggregates. The performance of these aggregates in dye-sensitized solar cells （DSCs） indicated that hierarchical structured photoelectrodes can increase energy conversion efficiency of DSCs effectively when the sizes of aggregates match the wavelengths of visible light.

关键词： dye-sensitized solar cells zinc oxide hierarchical aggregate solvothermal synthesis light scattering

自支撑多孔4A型分子筛整体材料的制备与表征

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非金属矿 2024年第1期47卷 18-23页

作者：仇秀梅刘亚东刘意蔡浩梁雅琪湖北省地质实验测试中心自然资源部稀有稀散矿产重点实验室湖北武汉430034 湖北城市建设职业技术学院市政工程学院湖北武汉430205 中国地质大学材料与化学学院湖北武汉430074

自支撑多孔分子筛整体材料的构建可同时解决分子筛颗粒成型和多孔结构的问题。以偏高岭土为原料,聚甲基丙烯酸甲酯(PMMA)为可去除模板,采用非溶剂法制备了自支撑多孔4A型分子筛整体材料。通过X射线衍射(XRD)、扫描电镜(SEM)等多种手段... 详细信息

自支撑多孔分子筛整体材料的构建可同时解决分子筛颗粒成型和多孔结构的问题。以偏高岭土为原料,聚甲基丙烯酸甲酯(PMMA)为可去除模板,采用非溶剂法制备了自支撑多孔4A型分子筛整体材料。通过X射线衍射(XRD)、扫描电镜(SEM)等多种手段表征各工艺参数对产物结构和形貌的影响。结果表明,自支撑多孔4A型分子筛的最佳制备工艺为:偏高岭土(MK)与PMMA微球质量比为5∶5,Na与Al摩尔比为1.2,水与偏高岭土质量比为1.1,固化温度为70℃,煅烧温度为550℃,煅烧时间为2 h时,产物具有立方体形貌和多孔结构,比表面积为393.83 m^(2)/g,总孔体积为0.26 cm^(3)/g。4A型分子筛块体外观规整、致密,可作为整体式吸附剂或大体积吸附剂使用。

关键词：自支撑4A型分子筛多孔结构偏高岭土有机微球煅烧

Analysis of minimum specific energy consumption and optimal transport concentration of slurry pipeline transport systems

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Particuology 2022年第7期20卷 38-47页

作者： Mingzhi Li Yanping He Ruhong Jiang Ji Zhang Hongsheng Zhang Weihuang liu yadong liu State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Marine Equipment Shanghai Jiao Tong UniversityShanghai 200240China CHEC Dredging Co. Ltd.Shanghai 200136China National Engineering Research Center of Dredging Shanghai 200120China

Slurry pipeline transport is widely used in several industrial *** the specific power consumption(SPC)and determining the best working conditions are important for the design and operation of transportation *** on the Shanghai Jiao Tong University high-concentration multi-sized slurry pressure drop(SJTU-HMSPD)pipeline-resistance-calculation model,the SJTU-SPC model for calculating the power required to transport a unit volume of solid materials over a unit pipeline length is established for a slurry transport *** said system demonstrates a uniformity coefficient in the 1.26–7.98 range,median particle size of 0.075–4 mm,particle volume concentration of 10–60%,and pipeline diameter of 0.203–0.8 *** results obtained were successfully verified against existing experimental *** influence of parameters,such as particle-gradation uniformity coefficient,median particle size,pipe diameter,and particle volume concentration,on the SPC were *** results revealed that the greater is the uniformity coefficient,the smaller is the minimum specific energy consumption and the larger the optimal transport concentration for a constant,median particle size *** observed,the optimal transport concentration for broad-graded sand equalled approximately 48%.These results supplement the conclusions of existing research,indicating that the optimal transport concentration is approximately 30%and provides theoretical support for high concentration transportation of broad graded slurry.

关键词： Slurry pipeline transport system Specific power consumption Minimum specific energy consumption Optimal transport concentration

基于变分模态分解与空洞卷积神经网络的配电网故障选线方法

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电网与清洁能源 2024年第2期40卷 110-118,126页

作者：李成钢刘亚东杨雪凤侍哲于非桐刘乃毓罗国敏国网吉林省电力有限公司电力科学研究院吉林长春130021 北京交通大学电气工程学院北京100044

小电流接地系统发生单相接地故障时,零序电流故障特征微弱且繁杂多变,传统选线方法可靠性有待提高。提出了一种基于变分模态分解(variational mode decomposition,VMD)与空洞卷积神经网络的配电网故障选线方法。首先,分析配电网健全线... 详细信息

小电流接地系统发生单相接地故障时,零序电流故障特征微弱且繁杂多变,传统选线方法可靠性有待提高。提出了一种基于变分模态分解(variational mode decomposition,VMD)与空洞卷积神经网络的配电网故障选线方法。首先,分析配电网健全线路和故障线路的电气特征,采用零序电流作为故障特征信号,为选线模型的输入量提供理论依据;其次,通过变分模态分解把零序电流序列分成不同频率的固有模态函数,提高故障信号特征的平稳性和差异性;然后,采用空洞卷积神经网络作为选线网络,以增大卷积操作感受野的方式增强模型的自适应分类能力;最后,在MATLAB/Simulink中构建10kV配电网进行算例分析,结果表明,该方法在不同故障场景条件下均有较高的选线效果,验证了所提方法的鲁棒性与准确性。

关键词：变分模态分解空洞卷积神经网络单相接地故障故障选线配电网