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Fault locating for traveling-wave accelerators based on transmission line theory

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Nuclear Science and Techniques 2023年第8期34卷 24-34页

作者： Tong-Ning Hu Hai-Meng Wang Yi-Feng Zeng Hong-Jie Xu Li Chen Guang-Yao Feng Yuan-Ji Pei State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Grid Fujian Economic Research Institute Fuzhou 350012China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Radio-frequency(RF)breakdown analysis and location are critical for successful development of high-gradient traveling-wave(TW)accelerators,especially those expected to generate high-intensity,high-power *** with commonly used schemes involving dedicated devices or complicated techniques,a convenient approach for breakdown locating based on transmission line(TL)theory offers advantages in the typical constant-gradient TW-accelerating *** deliver such an approach,an equivalent TL model has been constructed to equate the TW-accelerating structure based on the fun-damental theory of the TL transient response in the time *** equivalence relationship between the TW-accelerating structure and the TL model has been established via analytical derivations associated with grid charts and verified by TL circuit ***,to validate the proposed fault-locating method in practical applications,an elaborate analysis via such a method has been conducted for the recoverable RF-breakdown phenomena observed at an existing prototype of a TW-accelerating-structure-based beam injector constructed at the Huazhong University of Science and *** addition,further considerations and discussion for extending the applications of the proposed method have been *** breakdown-locating approach involving the transient response in the framework of TL theory can be a conceivable supple-ment to existing methods,facilitating solution to construction problems at an affordable cost.

关键词： Traveling-wave structure RF breakdown Fault locating transmission line

A transmission line-type electrical model for tapered TSV considering MOS effect and frequency-dependent behavior

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Journal of Semiconductors 2015年第2期36卷 92-98页

作者：刘松单光宝谢成民杜欣荣 Department of Postgraduates Xian Microelectronics Technology Research Institute

The analytical model of voltage-controlled MOS capacitance of tapered through silicon via （TSV） is derived. To capture the frequency-dependent behavior of tapered TSV, the conventional analytical equations of RLCG for two-wire transmission lines are revised. With the adoption of MOS capacitance model and the revised RLCG analytical equations, a transmission line-type electrical model for tapered TSV is proposed finally. All the proposed models are validated by simulation tools, and a good correlation is obtained between the proposed models and simulations up to 100 GHz. With the proposed model, both the semiconductor phenomenon and frequency- dependent behavior of tapered TSV can be fully captured at high frequency, and the performance of tapered TSV can be evaluated accurately and conveniently prior to 3D IC design.

关键词： 3D IC TSV TSV electrical model MOS effect transmission line

Statistical Properties of a System Consisting of a Superconducting Qubit Coupled to an Optical Field Inside a transmission line

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Communications in Theoretical Physics 2018年第6期69卷 727-734页

作者： Clodoaldo Valverde Gabriela Rodrigues Vaz Vitor Teles de Oliveira Basilio Baseia Campus de CiSncias Exatas e Tecnologicas Universidade Estadual de GoiaisBR 153km 9875.132-903 AnapolisGOBrazil Universidade Paulista(UNIP)-74.845-090 GoianiaGoiasBrazil Instituto de Ffsica Universidade Federal de Goias-74.001-970GoianiaGoiasBrazil Departamento de Fisica Universidade Federal da Paraiba-58.051-970Joao PessoaParaibaBrazil

The present work investigates the entropy and the excitation inversion of a coupled system that consists of a qubit represented by a Cooper pair box （CPB） interacting with a transmission line working as a circuit quantum eleetrodynamics （CQED）. The proposed scheme uses the Buck-Sukumar model with a time dependent frequency in the presence of losses to study the evolution of the entropy and the excitation inversion of the system. We have shown that the CQED is much more sensitive to the presence of losses than the CPB. The results also show that it is possible to monitor properties of the subsystems through appropriate choices of the time-dependent parameters.

关键词： excitation inversion transmission line entropy Buck-Sukumar model

Fault component integrated impedance-based pilot protection scheme for EHV/UHV transmission line with thyristor controlled series capacitor(TCSC) and controllable shunt reactor(CSR)

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Science China(Technological Sciences) 2013年第2期56卷 342-350页

作者： HE ShiEn SUONAN JaLe KANG XiaoNing JIAO ZaiBin Department of Electrical Engineering Xi'an Jiaotong University Wind Power Technology Center Gansu Electric Power Corporation

This paper analyzes the fundamental frequency impedance presents a novel transmission line pilot protection scheme characteristic of a thyristor controlled series capacitor （TCSC） and based on fault component integrated impedance （FCII） calculated for a transmission line with TCSC and controllable shunt reactor （CSR）. The FCII is defined as the ratio of the sum of the fault component voltage phasors of a transmission line with TCSC and CSR to the sum of the fault component current phasors where all the phasors are determined at both line＇s terminals. It can be used to distinguish internal faults occurring on the line from external ones. If the fault is an external one the FCII reflects the line＇s capacitive impedance and has large value. If the fault is an internal one on the line the FCII reflects the impedance of the equivalent system and the line and is relatively small. The new pilot protection scheme can be easily set and has the fault phase selection ability and also it is not affected by the capacitive current and the fault transition resistance. It is not sensitive to compensation level and dynamics of TCSC and CSR. The effectiveness of the new scheme is validated against data obtained in ATP simulations and Northwest China 750 kV Project.

关键词： EHV/UHV transmission line pilot protection fault component integrated impedance (FCII) thyristor controlled seriescapacitor (TCSC) controllable shunt reactor (CSR)

Optimal Parameter Estimation of transmission line Using Chaotic Initialized Time-Varying PSO Algorithm

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Computers, Materials & Continua 2022年第4期71卷 269-285页

作者： Abdullah Shoukat Muhammad Ali Mughal Saifullah Younus Gondal Farhana Umer Tahir Ejaz Ashiq Hussain Department of Electrical Engineering HITEC UniversityTaxila47080Pakistan Department of Electrical Engineering Islamia UniversityBahawalpur63100Pakistan Department of Electrical Engineering Iqra UniversityIslamabad44000Pakistan

transmission line is a vital part of the power system that connects two major points,the generation,and the *** an efficient design,stable control,and steady operation of the power system,adequate knowledge of the transmission line parameters resistance,inductance,capacitance,and conductance is of great *** parameters are essential for transmission network expansion planning in which a new parallel line is needed to be installed due to increased load demand or the overhead line is replaced with an underground *** paper presents a method to optimally estimate the parameters using the input-output quantities i.e.,voltages,currents,and power factor of the transmission *** equivalentπ-network model is used and the terminal data i.e.,sending-end and receiving-end quantities are assumed as available measured *** parameter estimation problem is converted to an optimization problem by formulating an error-minimizing objective *** improved particle swarm optimization(PSO)in terms of time-varying control parameters and chaos-based initialization is used to optimally estimate the line *** cases are considered for parameter estimation,the first case is when the line conductance is neglected and in the second case,the conductance is considered into *** results obtained by the improved algorithm are compared with the standard version of the algorithm,firefly algorithm and artificial bee colony algorithm for 30 number of *** is concluded that the improved algorithm is tremendously sufficient in estimating the line parameters in both cases validated by low error values and statistical analysis,comparatively.

关键词： Chaos parameter estimation transmission line time-varying particle swarm optimization pi-network

Impacts of flexible obstructive working environment on dynamic performances of inspection robot for power transmission line

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Journal of Central South University of Technology 2008年第6期15卷 869-876页

作者：肖晓晖吴功平杜娥李三平 College of Power and Mechanical Engineering Wuhan University

The rigid-flexible coupling dynamic modeling and simulation of an inspection robot were conducted to study the influences of the flexible obstructive working environment i.e. overhead transmission line on the robot＇s dynamic performance. First, considering the structure of the obstacles and symmetrical mechanism of the robot prototype, four basic subactions were abstracted to fulfill full-path kinematic tasks. Then, a multi-rigid-body dynamic model of the robot was built with Lagrange equation, whil^e a multi-flexible-body dynamic model of a span of lin~ was obtained by combining finite element method （FEM）, modal synthesis method and Lagrange equation. The two subsystem models were coupled under rolling along no-obstacle segment and overcoming obstacle poses, and these simulations of three subactions along different spans of line were performed in ADMAS. The simulation results, including the coupling vibration parameters and driving moment of joint motors, show the dynamic performances of the robot along ftexibile obstructive working path： in flexible obstructive working environment, the robot can fulfill the preset motion goals; it responses slower in more flexible path; the fluctuation of robot as well as driving moment of the corresponding joint in startup and brake region is greater than that in rigid environment; the fluctuation amplitude increases with increasing working environment flexibility.

关键词： inspection robot transmission line obstruction rigid-flexible coupling dynamics finite element method simulation

130 nm CMOS Multi-Stage Synthetic transmission line Based Amplifier Beyond 100 GHz

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Transactions of Tianjin University 2016年第1期22卷 1-6页

作者：张明名吴宪顺李光福王新庄晴光 School of Electronic Information Engineering Tianjin University School of Electronic Information Engineering Tianjin University Millimeter-wave and Terahertz Wireless System Electronics Research Center University of Chinese Academy of Sciences

A 130 nm CMOS complementary-conducting-strip transmission line(CCS-TL)based multi-stage amplifier beyond 100 GHz was presented in this paper. Different structural parameters were investigated to achieve higher quality factor for the matching circuits. Moreover, CCS-TL based Marchand balun was implemented to achieve higher output power. The measured small signal gain was higher than 5 d B from 101 GHz to 110 GHz. DC power consumption was 67.2 mW with V_D=1.2 V, and the chip size including contact PADs was 1.12 mm×0.81 mm.

关键词： CMOS amplifier Marchand balun transmission line 100 GHz

Classification of transmission line Ground Short Circuit Fault Based on Convolutional Neural Network

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Energy Engineering 2022年第3期119卷 985-996页

作者： Tao Guo Gang Tian Zhimin Ao Xi Fang Lili Wei Fei Li Tongren Power Supply Bureau of Guizhou Power Grid Co. Ltd.Tongren554300China

Ground short circuit faults in current transmission lines are common in the power *** order to prevent the power system from aggravating the accident caused by short-circuit faults of transmission lines,a novel convolutional neural network(CNN)model is constructed to identify the short-circuit fault of the transmission line in the power *** CNN model is mainly consisted of five convolutional layers,three max-pooling layers,one concatenate layer,one dropout layer,one fully connected layer,and a Softmax *** method uses a fixed time window to intercept system short-circuit fault data,extracts the deep features of these data from the training samples,and then corresponds the extracted features to labels ***,in PSCAD/EMTDC,the new England 10 machine 39 nodes are taken as an example to realize the *** experimental results show that the CNN model can quickly and accurately identify the short-circuit fault types,and the optimal model accuracy rate reaches 99.95%.The results of this manuscript-have positive effect on enhancing the disaster prevention capability and the operation stability of transmission lines.

关键词： Convolutional neural networks transmission line fault classification

Development of Automatic Device for Conductor Crimping of transmission line 32

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Development of Automatic Device for Conductor Crimping of Tr...