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Plate-like carbon-supported Fe_(3)C nanoparticles with superior electrochemical performance

Rare Metals 2021年第6期40卷 1402-1411页

作者： Chuan Chen Sen Qian Tian-Hao Yao Jing-Hong Guo Hong-Kang Wang Electric Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Future Science ParkBeijing 102209China Department of Electric Power Sensing Technology Future Science ParkGlobal Energy Interconnection Research Institute Co.LtdBeijing 102209China School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Iron-based anodes for lithium-ion batteries(LIBs)with higher theoretical capacity,natural abundance and cheapness have received considerable attention,but they still suffer from the fast capacity *** address this issue,we report a facile synthesis of plate-like carbonsupported Fe_(3)C nanoparticles through chemical blowing/carbonization under *** ultrafine Fe_(3)C nanoparticles are prone to be oxidized when exposing in air;thus,Fe_(3)C/C with mild oxidization and the fully oxidized product of Fe_(2)O_(3)/C are successfully prepared by controlling the oxidization *** applied as an anode material in LIB,the Fe_(3)C/C electrode demonstrates excellent cycle stability(826 mAh·g^(-1)after 120 cycles under 500 mA·g^(-1))and rate performance(410.6 mAh·g^(-1) under 2 A·g^(-1)),compared with the Fe_(2)O_(3)/C *** enhanced electrochemical performance can be ascribed to the synergetic effect of the Fe_(3)C with mild oxidation and the unique hierarchical structure of plate-like carbon decorated with Fe_(3)C *** importantly,this work may offer new approaches to synthesize other transition metal(e.g.,Co,Ni)-based anode material by replacing the precursor ingredient.

关键词： Lithium-ion batteries Fe_(3)C Mild oxidation Anode material Lithium storage

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Channel Characteristics Analysis of Medium Voltage Overhead and Mixed Overhead/Underground Cable power Network 20

Channel Characteristics Analysis of Medium Voltage Overhead ...

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20th IEEE International Conference on Communication technology, ICCT 2020

作者： Lu, Yang An, Chunyan Gao, Hongjian Ye, Jun Elec. Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Beijing China State Grid Chongqing Electric Power Company Electric Power Research Institute Chongqing China

ISBN: (纸本)9781728181417

This paper analyzes the Medium Voltage (MV) power line channel characteristics with overhead and mixed overhead/underground cable network in China. In order to compare the characteristics such as attenuation and noise between narrow-band (30-500 kHz) and broadband (0.5-20 MHz) channels, some field measurements were performed and Link Quality Index (LQI) was proposed to evaluate the channel conditions at different frequencies. The results show that, in contrast to most Low Voltage (LV) underground cables, the MV overhead lines have much less attenuation over the wide frequency range. However, due to small attenuation and long distance, overhead line usually presents strong multipath effects which lead to fragile landscape of usable frequencies for power Line Communications (PLC). On the other side, broadcast radios can present dominant narrow-band noises at broadband channels. According to the LQI evaluations, to effectively cope with the great variety of MV channels with unknown characteristics, viable PLC system should flexibly adapt its working frequency to the local channel conditions. © 2020 IEEE.

关键词： Underground cables

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Electric Field Distribution Characteristics of Novel Fiber Sensor with Semiconductor Light Source 2

Electric Field Distribution Characteristics of Novel Fiber S...

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2nd IEEE International Conference on Electronic technology, Communication and Information, ICETCI 2022

作者： Jie, Huang Ni, Pengcheng Shuo, Chen Zhao, Xuyang Global Energy Internet Research Institute Changping Beijing China Elec. Pwr. Intelligent Sensing Technology and Application of State Grid Corporation Joint Laboratory Beijing China Anhui Jiyuan Software Co. Ltd Sgitg Hefei China North China Electric Power University School of Electrical and Electronic Engineering Changping Beijing China

ISBN: (数字)9781728181158

ISBN: (纸本)9781728181158

The light source element is an important part of the optical fiber sensor, and the selection of a suitable and reliable light-emitting element is critical factor for accurately measuring the parameters. The structural optimization of the optical fiber sensor semiconductor light source device is based on obtaining a more accurate field distribution. This paper analyzes the electric field distribution characteristics of a novel optical fiber sensor with semiconductor light source device by finite element method (FEM). The rationality of the electromagnetic shielding design of the model is verified by analyzing electric field distribution of the semiconductor light source device under different electromagnetic radiation conditions. © 2022 IEEE.

关键词： Finite element method

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Beam collimation scheme of laser wireless power supply system for high potential monitoring node of power transmission and transformation 7

Beam collimation scheme of laser wireless power supply syste...

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2021 7th International Conference on Manufacturing technology and Applied Materials, ICAMMT 2021

作者： Feng, Huang Hui, Huang Hui, Deng Yang, Tianyi Zhang, Xiangyu Global Energy Internet Research Institute Co. Ltd. Jiangsu ProvinceNanjing210003 China Elec. Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Beijing China Nanjing University of Aeronautics and Astronautics Nanjing China Economic and Technological Research Institute of State Grid Shanxi Electric Power Company Shanxi China

Laser wireless power supply technology has the advantages of high energy density, good directionality, small transmitting and receiving aperture, convenient and flexible installation and deployment. It is very suitable for power supply for sensors or mobile electrical equipment in complex high potential environment, such as patrol UAV. Because the beam quality of high-power semiconductor laser is far worse than that of other types of lasers, when it is used as the transmitter of beam shaping system, it must be equipped with corresponding beam shaping system to obtain laser beam with uniform spot, appropriate size and small divergence angle, so as to ensure that the photoelectric cell module has high conversion efficiency and meet the needs of long-distance laser transmission. In this paper, a beam collimation scheme based on aspheric lens group is designed, which integrates optical devices with low cost, reduces the energy loss in the process of laser transmission, and obtains laser beam with certain intensity uniformity. The test shows that the collimator can better meet the parameter requirements of the collimation system. © Published under licence by IOP Publishing Ltd.

关键词： Laser beams

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Channel Modeling of BPLC at Customer Side Based on Parameter Estimation 21

Channel Modeling of BPLC at Customer Side Based on Parameter...

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21st IEEE International Conference on Communication technology, ICCT 2021

作者： Gao, Hongjian Lu, Yang Liu, Yao Wang, Qiang Xie, Guangcheng Li, Jianqi Global Energy Interconnection Research Institute Co. Ltd. Elec. Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Beijing China Beijing University of Posts and Telecommunications National Engineering Lab for Mobile Network Technologies Beijing China Marketing Service Center State Grid Chongqing Electric Power Company Chongqing China

ISBN: (纸本)9781665432061

power line communication (PLC) is a unique communication mode of the power grid. It has the advantages of no need for communication channel construction, flexible deployment, convenient operation, and maintenance. This paper analyzes the influence of basic characteristics of distribution network at customer side on broadband PLC (BPLC) channel (0.5 20MHz), including line branch, cable length, and power load. Then, we fitted the real data of typical urban distribution networks in China and the nonlinear least square method. The results show that the average attenuation model can not accurately represent the characteristics of the BPLC channel. As a result, the multipath model of BPLC is then developed, which has a good description ability for BPLC at the customer side with lower RMSE and lays a foundation for the further research and application of BPLC application technology. © 2021 IEEE.

关键词： Sales

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Phase resolved partial discharge patterns of typical defects from generator stators with different size of samples

Phase resolved partial discharge patterns of typical defects...

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International Conference on High Voltage Engineering and application, ICHVE

作者： Cong Li Xiaosheng Peng Peng Ling Tao Liu Jin Zhou Yue Zhang School of Electrical and Electronic Engineering The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory Huazhong University of Science and Technology Wuhan China China Southern Power Grid Energy Storage Co Ltd Guangzhou China Dongfang Electric Machinery Co Ltd. Dongfang Electric Corporation Deyang China

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

Partial discharge (PD) is a common fault in power equipment, which poses a serious threat to the safe operation of large generators. This study is to analyze the phase resolved partial discharge (PRPD) mode of large generator stator in detail, and to explore the characteristics of different typical insulation defects in PRPD mode. In this study, typical defect types of stator bar are made, including delamination defects between the conductor and insulation, delamination defects between insulation and insulation, defects in the slot, and defects at the end. Voltage withstand tests were carried out at 20 kV, and PRPD patterns with 1, 10, 100, 1000 superposition groups of different defects were obtained. Main conclusions can be drawn as follows: (1) Unique shapes in patterns are evident at different superposition group sizes. As for delamination defects between the conductor and insulation, unique cluster can be clearly seen in low-number superposition groups but another unique cluster can be clearly seen in high-number superposition groups. (2) The PRPD patterns of different superposition groups of the same defect type can be well separated by t-SNE. As for defects in slot, the silhouette coefficients and rand coefficients gradually increase. (3) The more superimposed groups are, the better the PRPD patterns of different defect types can be distinguished. As for defects at the end, the discreteness gradually increases and the densities gradually decreases as the superposition groups increase.

关键词： Partial discharges Insulation Shape Voltage High-voltage techniques Conductors Stator bars

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Next POI Recommendation Based on Location Interest Mining with Recurrent Neural Networks

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Journal of Computer Science & technology 2020年第3期35卷 603-616页

作者： Ming Chen Wen-Zhong Li Lin Qian Sang-Lu Lu Dao-Xu Chen State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China Sino-German Institutes of Social Computing Nanjing UniversityNanjing 210023China State Grid Electric Power Research Institute NARI Group CorporationNanjing 211000China

In mobile social networks,next point-of-interest(POI)recommendation is a very important function that can provide personalized location-based services for mobile *** this paper,we propose a recurrent neural network(RNN)-based next POI recommendation approach that considers both the location interests of similar users and contextual information(such as time,current location,and friends’preferences).We develop a spatial-temporal topic model to describe users’location interest,based on which we form comprehensive feature representations of user interests and contextual *** propose a supervised RNN learning prediction model for next POI *** based on real-world dataset verify the accuracy and efficiency of the proposed approach,and achieve best F1-score of 0.196754 on the Gowalla dataset and 0.354592 on the Brightkite dataset.

关键词： location interest location-based service point-of-interest(POI)recommendation mobile social network

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Partial Discharge Small Sample Pattern Recognition for Generator Stator based on SP-Attention and Triplet-DenseNet

Partial Discharge Small Sample Pattern Recognition for Gener...

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International Conference on High Voltage Engineering and application, ICHVE

作者： Hongyu Wang Xiaosheng Peng Cong Li Peng Ling Tao Liu Yue Zhang Jin Zhou The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China China Southern Power Grid Energy Storage Co. Ltd. Guangzhou China Dongfang Electric Machinery Company Ltd. Dongfang Electric Corporation Deyang China

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

A novel partial discharge (PD) pattern recognition method based on SP-Attention and Triplet-DenseNet is proposed. Generator stators face a multitude of aging stresses that can compromise their insulation systems, making reliable PD detection crucial for assessing their condition. Traditional methods face challenges due to the scarcity of comprehensive and well-labeled datasets. Our proposed method integrates SP-Attention to enhance feature extraction throughout Phase-Resolved Partial Discharge (PRPD) spectra, establishing critical long-range dependencies within the dataset. Furthermore, we employ Triplet-DenseNet, a contrastive learning framework designed to efficiently process features in datasets with limited samples. This system significantly improves diagnostic capabilities, especially in distinguishing between highly similar PD patterns. In laboratory conditions, common insulation defects were simulated and subsequent tests were conducted. These tests were shown to confirm that our method surpasses traditional deep learning models in terms of accuracy and robustness. The proposed method achieves an accuracy exceeding 97% in scenarios characterized by limited and similar sample sets, significantly enhancing the analysis of generator stator PD.

关键词： Partial discharges Training Deep learning Insulation Accuracy Face recognition Feature extraction

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Microstructure, Magnetic Domains and Magnetic Properties of Ti/Fe/Ni81fe19/Fe/Ti Multilayer Films by Obliquely Deposition

SSRN

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SSRN 2022年

作者： He, Zongsheng Li, Ziyu Ma, Zenan Chen, Chuan Wang, Chaoming Wu, Chuanjian Song, Xinglian Jiang, Xiaona Yu, Zhong Lan, Zhongwen Sun, Ke School of Materials and Energy University of Electronic Science and Technology of China Chengdu610054 China Electric Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Beijing102209 China Department of Electric Power Sensing Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing102209 China Shandong Chunguang Magnetoelectricity Technology Co. Ltd. Linyi276017 China

The metallic magnetic thin films are widely used in high-frequency magnetic devices, the reliability of which greatly depends on the saturation magnetization ( Ms) and resonance frequency ( fr) of the films. However, increasing the operating frequency of the magnetic thin film is extremely challenging. This study investigates the microstructure, magnetic domains and magnetic properties of obliquely deposited Ti/Fe/Ni81Fe19/Fe/Ti multilayer films. The coercivity distribution of the deposited films is investigated by first order reversal curve (FORC) measurements. The result of static magnetic properties revealed the in-plane uniaxial anisotropy with a high anisotropy field ( Hk) up to 495 Oe. A magneto-optical Kerr microscope image displayed the multi-step magnetization reversal processes at different oblique angles. Complex permeability spectra indicated that the resonance frequency increases from 1.27 to 4.71 GHz as the deposition angle is increased from 0 to 25°. Thus, Ti/Fe/Ni81Fe19/Fe/Ti multilayer film with tunable magnetic performances is one of the good candidate materials for microwave devices. © 2022, The Authors. All rights reserved.

关键词： Magnetization reversal

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Research on passive trigger technology of thyristor controllable arrester 16

Research on passive trigger technology of thyristor controll...

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16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Li, Fangyi Qiao, Guangyao Chen, Shaobing Jin, Yanjiao Zhao, Guoliang Li, Weiguo Shi, Qiuyu Feng, Qian State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing102209 China State Grid Corporation of China Beijing102209 China State Grid Shanghai Electrical Power Company Research Institute Shanghai200437 China

ISBN: (纸本)9781839533914

The operating and lightning overvoltage in UHV system can be deeply suppressed by the thyristor controllable metal oxide arrester (TCMOA), which means that the cost of insulation for key equipment in the system can be greatly reduced. Traditional triggering methods are no longer suitable for TCMOA because of the limitation of application scenarios, such as, insulation, volume, time delay, etc. Based on the V-I characteristic of BOD, in this paper, a passive and compact trigger circuit was designed and applied to the laboratory prototype for TCMOA. The transient impact of trigger circuit and prototype tests were carried out. The results show that, the circuit can be stably turned on at about 6kV, and the action voltage index of the prototype meets the design requirements. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Thyristors

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