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Using of sparse principal component analysis for identifying critical locations of the active distribution system

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Using of sparse principal component analysis for identifying...

Analysis on the Structural Type of Large-span Steel Truss Bridge Specially Designed for Cables

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作者： Peixiang Zheng Bin Chen Yuanliang Fan Gonglin Zhang Yang Liu State Grid Fujian electric power CO. Ltd State Grid Fujian electric Research institute Fujian Provincial Enterprise Key Laboratory of High Reliable electric power Distribution Technology College of electrical and Electronic engineering Shandong University of Technology

ISBN: (纸本)9781538629185

This paper presents a method for the identification of critical locations of power systems using the measurable variables of the active distribution *** critical locations are identified using sensitive sparse principal component analysis（SSPCA） where the loadings of some variable in principal components are restricted to *** is tested on the UK 77-bus ***,SSPCA and principal component analysis were investigated and the results analyzed and *** two methods provided comparable results in identification of critical *** validity and potential of SSPCA are demonstrated through simulation and a comparative *** identification of critical locations in a power system will enable power operators/engineers using limited resources for prioritization of these locations for Phasor Measurement Units（PMUs） and other advanced measurement systems deployment.

关键词： critical locations active distribution grid sensitive sparse principal component critical variable steady state

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Journal of Building Material Science 2021年第1期3卷 9-14页

作者： Xipeng Gao Xiwei He shandong electric power engineering consulting institute Corp. Ltd.JinanShandong250013China

When the installation of cables and pipelines needs to go across rivers,bridges are usually adopted to support the cables and pipelines for crossing the *** measure can make full use of the space resources and have no effect on the flow pattern of *** this reason,analysis on the structural-type design of a large-span steel truss bridge specially used for cables has been *** numerical results indicate that the stayed-cable bridge with steel truss beam and concrete main tower has better performance and improved structural type caparisoned with that of the beam and arch bridges,and the construction of the major beam can be without the temporary support.

关键词： Large span Steel truss Cable Pipe bridge Design

Vibration Deformation Monitoring of Offshore Wind Turbines Based on GBIR

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Journal of Ocean University of China 2021年第3期20卷 501-511页

作者： MA Deming LI Yongsheng LIU Yanxiong CAI Jianwei ZHAO Rui The First institute of Oceanography Ministry of Natural ResourcesQingdao 266061China College of Environmental Science and engineering Ocean University of ChinaQingdao 266100China The Predecessor of the institute of Crustal Dynamics China Earthquake AdministrationBeijing 100085China China Center for Resource Satellite Data and Applications Beijing 100094China State Nuclear electric power Planning Design and Research institute Company Limited Beijing 100094China

In view of the disadvantages of vibration safety monitoring technology for offshore wind turbines,a new method is proposed to obtain deformation information of towering and dynamic targets in real-time by the ground-based interferometric ra-dar(GBIR).First,the working principle and unique advantages of the GBIR system are ***,the offshore wind turbines in Rongcheng,shandong Province are selected as the monitoring objects for vibration safety monitoring,and the GPRI-II portable radar interferometer is used for the health diagnosis of these wind ***,the interpretation method and key processing flow of data acquisition are described in *** experiment shows that the GBIR system can accurately identify the millimeter-scale vibration deformation of offshore wind turbines and can quickly obtain overall time series deformation images of the target bodies,which demonstrate the high-precision deformation monitoring ability of the GBIR *** accuracy meets the requirements of wind turbine vibration monitoring,and the method is an effective spatial deformation monitoring means for high-rise and dynamic *** study is beneficial for the further enrichment and improvement of the technical system of wind turbine vibration safety monitoring in *** also provides data and technical support for offshore power engineering management and control,health diagnosis,and disaster prevention and mitigation.

关键词： wind turbine vibration deformation monitoring GBIR key technology technology support

Research progress of semiconductive shielding layer of HVDC cable

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High Voltage 2020年第1期5卷 1-6页

作者： Yanhui Wei Wang Han Guochang Li Qingquan Lei Mingli Fu Chuncheng Hao Guanjun Zhang institute of Advanced electrical Materials Qingdao University of Science and TechnologyQingdaoPeople's Republic of China State Key Laboratory of electrical Insulation and power Equipment Xi'an Jiaotong UniversityXi'anPeople's Republic of China China South power Grid International Co. LtdGuangzhouPeople's Republic of China

As an indispensable part of high-voltage direct current(HVDC)cable,the semiconductive shielding layer plays the role of uniforming electric field in the ***,cable shielding materials>35 kV mainly rely on foreign imports in China,which belongs to the technical weak issues in the field of electrical *** present,there are few systematic reports on semiconductive shielding material of HVDC *** the work,the mechanisms of charge conduction and thermal conduction of semiconductive material have been *** of raw material,carbon black content and the second conductive filler on the resistance characteristics of the semiconductive layer,the charge accumulation characteristics of the insulating layer and the interface characteristics have been studied.A kind of semiconductive layer as a high voltage terminal charge emission method has been proposed to study charge emission from the semiconducting layer to the insulation *** work can provide theoretical guidance for the research of semiconductive shielding materials.

关键词： conductive layer conduction

A Novel electric Dual Motor Transmission for Heavy Commercial Vehicles

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Automotive Innovation 2021年第1期4卷 34-43页

作者： Xiangyang Xu Jiajia Liang Qingjun Hao Peng Dong Shuhan Wang Wei Guo Yanfang Liu Zhonghua Lu Jiantao Geng Bin Yan School of Transportation and Science engineering Beihang UniversityBeijing 102206China Ningbo institute of Technology Beihang UniversityNingbo 315832China eKontrol Co. Ltd.Suzhou 215211China

As a vital vehicle part,the powertrain system is undergoing a fast transition towards *** new integrated electric drive system has been widely used,especially for passenger *** this work,a novel electric dual motor transmission is proposed for heavy commercial *** transmission scheme is firstly introduced,which can achieve 9 different operating modes including 5 single motor modes and 4 dual motor ***,the mode shift map with minimum energy consumption is designed based on the motor efficiency map and the proposed energy management *** driving power is appropriately distributed between the two motors in dual motor modes under the condition of minimum power *** addition,a coordinated control strategy is developed for mode shift control without power *** results show that the electric dual motor transmission has advantages in power consumption and power shift ability compared with the conventional single motor automated manual transmission.

关键词： Dual motor transmission Operating mode Mode shift map Mode shift control Torque distribution Coordinated control

the shandong electric power engineering consulting institute science and technology project(Grant No.37-K2014-33).

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Fluid Dynamics & Materials Processing 2021年第1期17卷 123-139页

作者： Mengyuan Cao Yi Xu Yilin Dong institute of Biothermal Science&Technology University of Shanghai for Science and TechnologyShanghai200093China

The damage caused by thermal stress during rewarming vitrified biosamples is one of the major obstacles for clinical *** warming is a highly effective approach to overcome this hurdle and can achieve rapid and spatially homogeneous *** current research investigates the effects of magnetic warming on the histological and biomechanical properties of the vitrified umbilical arteries(UAs)through experiments and *** results of experiments show that,for the case of magnetic warming comparing with the conventional water bath,magnetic warming presents better preservation of extracellular matrix(ECM),collagen fibers,elastic fibers,and muscle fibers of the umbilical *** is no significant difference between magnetothermal and fresh UAs(p>0.05)in the elastic modulus and the ultimate *** theoretical results reveal that the maximum temperature difference Tmax inside the biosample is 1.117±0.649℃,and the maximum thermal stressmax is 0.026±0.016 ***,for the case of conventional water bath,Tmax is 32.342±0.967℃andmax is 1.453±0.047 ***,we have arrived at the same conclusion by simulation as theoretical calculation ***,magnetic warming can effectively reduce the thermal stress damage of biological samples during the warming period due to more uniform and rapid *** results confirm that magnetothermal can significantly improve the mechanical properties of large size cryopreserved tissues or organs such as UAs.

关键词： Umbilical artery vitrified magnetic warming mechanical properties thermal stress