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检索条件"机构=Rail Transit Power Supply and Control Engineering Technology Research Center"

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Characteristics of Interturn Short Circuit Fault in Three Phase Transformers 6th

Characteristics of Interturn Short Circuit Fault in Three Ph...

引用

6th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2023

作者： Xie, Xiaoyong Li, Gengyu Li, Chenxu Li, Hangbo Yang, Jingjian Power Supply Branch of Beijing Metro Operation Co. Ltd Beijing100044 China Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China

ISBN: (纸本)9789819993147

Transformer inter turn short circuit affects the stable operation of the power system, may cause transformer damage and bring significant economic losses. Therefore, this article first analyzes the inter turn short-circuit current characteristics and temperature field distribution of transformers from a theoretical perspective;Secondly, a multi physical field simulation model for transformer inter turn short circuit was built based on COMSOL, and the randomness of transformer inter turn faults was simulated under different conditions;Finally, a transformer winding inter turn short circuit experimental platform was built to verify the effectiveness and correctness of the simulation model and the conclusions obtained. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Transformer windings

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Dry-Type Transformer Fault Warning Based on Infrared Thermal Images 6th

Dry-Type Transformer Fault Warning Based on Infrared Thermal...

引用

6th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2023

作者： Chen, Lin Wang, Lu Yu, Yi Li, Danyang Zhang, Gang Power Supply Branch of Beijing Metro Operation Co. Ltd Beijing100044 China Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China

ISBN: (纸本)9789819993147

Dry-Type transformer is the core equipment of urban rail traction power supply system, its running state is directly related to the stability of the whole power supply system. Through infrared images, the overheating faults of a transformer can be directly reflected. In this paper, we first analyze and simulate four typical overheating faults: inter-turn short circuit, air duct blockage, long-term overload and terminal overheating, and then the infrared image dataset of faults is established. Next, a fault recognition model based on AlexNet is established. In contrast to the original AlexNet algorithm, batch normalization (BN) layer is added to reduce overfitting, and the number of parameters of the model is reduced by improving the convolution kernel parameters. The experimental results show that the number of AlexNet parameters is reduced by 83.99%, while the average classification accuracy reaches 95.41%, which is significantly higher than the original AlexNet algorithm. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Convolution

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A power Flow Optimization Method for Urban rail Flexible Traction power supply System Considering Train Dwell Time 6th

A Power Flow Optimization Method for Urban Rail Flexible Tra...

引用

6th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2023

作者： Ni, Zishi Zhang, Gang Yu, Hong Wang, Renyu Gong, Zhaofeng Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China Power Supply Branch of Beijing Metro Operation Co. Ltd. Beijing100044 China

ISBN: (纸本)9789819993185

The introduction of flexible traction power supply system can promote the mass utilization ratio of train regenerative braking energy, but the utilization is still insufficient. The unused part will be sent back to the urban distribution network through the converter in main substation, thus affecting its power supply quality. To solve them, this paper propones a power flow optimization tactic for urban rail transit flexible traction power supply system considering train dwell time. Firstly, the principle and law of regenerative braking energy utilization in flexible system are introduced, and the feasibility and necessity of further using this part of energy are analyzed. Secondly, the energy-economizing optimal model of urban rail multiple trains is established, and the system power flow optimization scheme considering train dwell time is designed based on PSO algorithm. Finally, based on real data of a domestic subway line, the validness of the scheme is supported by simulation. The simulation results indicate that the total energy expenditure of the optimized power supply system is reduced by 1.91%, and the energy saving efficiency is high, which has great practical value. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Energy utilization

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Dry-Type Transformers Fault Diagnosis Method Based on Signal Wavelet Transform and DBN 6th

Dry-Type Transformers Fault Diagnosis Method Based on Signal...

引用

6th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2023

作者： Yan, Siling Liu, Jing Gong, Zhaofeng Guan, Xinyu Zhang, Gang Traffic Control Technology Co. Ltd Beijing100044 China Beijing Jiaotong University Beijing China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China

ISBN: (纸本)9789819993147

Traction power supply system is a key infrastructure of urban rail transit, and dry-type transformer is an important equipment in traction power supply system, whose operation status is crucial to the safe and reliable operation of the whole power supply system. For the fault diagnosis of dry-type transformers, a fault diagnosis algorithm based on signal decomposition is proposed, and noise reduction is performed by reconstruction and hybrid feature extraction. First, the vibration signal is collected by vibration sensors, and the signal decomposition and reconstruction method based on wavelet decomposition is proposed for the noise reduction problem of the original signal. This method solves the problem that the traditional wavelet noise reduction method will lose feature information. Secondly, four relatively stable features are selected in the time domain and frequency domain respectively to form a new two-dimensional feature matrix, which enriches the fault feature information of the dry-type transformer. Finally, the extracted signals are put into the DBN deep confidence network for fault diagnosis. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Failure analysis

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On-line Monitoring and State of Health Estimation technology of Lead-Acid Battery 5th

On-line Monitoring and State of Health Estimation Technology...

引用

5th International Conference on Energy Storage and Intelligent Vehicles, ICEIV 2022

作者： Li, Danyang Zhang, Gang Gong, Zhaofeng Ma, Xingyuan Beijing Jiaotong University Beijing China Rail Transit Electrical Engineering Technology Research Center Beijing China Power Supply Branch of Beijing Metro Operation Co. Ltd. Beijing100082 China

ISBN: (纸本)9789819910267

Valve regulated lead-acid (VRLA) battery is in the floating charge state for a long time, and the online accurate assessment of its state of health (SOH) is of great significance. In this paper, the online monitoring platform is built, and the discharge characteristics of battery are tested. Based on the phenomenon of terminal voltage "steep drop and rise again" during discharge, nine characteristics were extracted, including trough voltage, plateau voltage, voltage difference, trough current, plateau current, current difference, trough time, plateau time and time difference. The health factors were obtained by dimension reduction through principal component analysis (PCA) and Pearson correlation coefficient. The BP neural network is built to estimate SOH of the battery and is optimized using genetic algorithm (GA). The accuracy of the battery SOH assessment model is verified by comparing with the capacity check discharge experiment data, and the feasibility of the proposed battery SOH assessment method is also proved. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Principal component analysis

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Wireless Resource Multiplexing Allocation Algorithm for Vehicle-vehicle Communication in 5G Network 8

Wireless Resource Multiplexing Allocation Algorithm for Vehi...

引用

8th International Conference on Electromechanical control technology and Transportation, ICECTT 2023

作者： Qiao, Yinqiang Li, Qiang Key Laboratory of Optoelectronic Technology and Intelligent Control Ministry of Education Lanzhou Jiaotong University China Gansu Industrial Transportation Automation Engineering Technology Research Center Lanzhou Jiaotong University China Gansu Province Rail Transit Signal and Control Evaluation Industry Technology Center Lanzhou Jiaotong University China

ISBN: (纸本)9781510668331

Compared with 4G, 5G has greatly improved spectral efficiency, speed, security, etc., and 5G network is suitable for large-scale and ultra-high-speed application scenarios that are highly consistent with rail transit communication modes, and can meet the communication needs of vehicle-vehicle communication. Introducing vehicle-vehicle communication into the traditional train control system, vehicle-vehicle communication will occupy the physical resource block of vehicle-ground communication, resulting in serious interference phenomenon. Aiming at the interference problem caused by the reuse of vehicle-to-vehicle communication resources, a wireless resource allocation algorithm is proposed under the premise of ensuring its reliability. The improved HM algorithm is used to allocate the channel, and finally the spectrum utilization is improved through power optimization. © 2023 SPIE.

关键词： Vehicle to vehicle communications

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Design of capacitor explosion-proof warning system based on STM32F103C8T6 single chip microcomputer 3

Design of capacitor explosion-proof warning system based on ...

引用

3rd International Conference on Mechanical, Electronics, and Electrical and Automation control, METMS 2023

作者： Yan, Jian-Hua You, Guang-Hao Zheng, Hai-Tao Zhao, Xu-Rui Yang, Cai-Wei Yu, Lan School of Energy and Power Changchun Institute of Technology Changchun130012 China Jilin Construction Energy Supply and Indoor Environment Control Engineering Research Center Changchun130012 China

ISBN: (纸本)9781510666689

This paper takes the STM32F103C8T6 single chip microcomputer as the core, adopts the combination of software and hardware, collects the field data through the partial pressure measurement module and temperature, pressure and other sensors set on the equipment site, uses the STM32F103C8T6 single chip microcomputer for intelligent data monitoring and real-Time data processing, ESP8266 Internet of Things WIFI chip to transmit the field monitoring information, and the Internet of Things platform for remote monitoring. The system can intelligently monitor all kinds of abnormal conditions. When there are abnormal conditions, the danger degree can be determined by defining the data collected on the site, and the intelligent decision-making system can conduct comprehensive analysis to realize real-Time early warning and alarm of capacitor fault. © 2023 SPIE.

关键词： Microcomputers

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A Train Positioning technology Based on Dual-Terminal Electrical Quantities 5th

A Train Positioning Technology Based on Dual-Terminal Electr...

引用

5th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2021

作者： Xu, Zhenxing Zhang, Gang Han, Lun Tan, Chen Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China Power Supply Branch of Beijing Metro Operation Co. Ltd Beijing100044 China

ISBN: (纸本)9789811699085

Train positioning failure will directly affect the safe operation of the train. In order to ensure the accuracy and availability of train positioning information, a new positioning method is urgently needed as an important supplement to traditional positioning technology. The structure, parameters, and operation characteristics of the DC traction power supply system for urban rail transit are analyzed. According to the relationship between the equivalent model of the power supply network and train position, a new train positioning method based on the electrical quantities of two traction stations is proposed, and the least square method is adopted to solve the equations. In view of the possibility that two trains operate in a single power supply interval, a dual train operation positioning method is proposed by adding the electrical quantities of the two trains. The proposed methods are verified by experiments on the simulation platform of urban rail transit power supply system, which proves the feasibility of this method. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Simulation platform

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Fault Section Location Method for Distribution Network Based on Characteristic Coefficient Matrix 10th

Fault Section Location Method for Distribution Network Based...

引用

10th Frontier Academic Forum of Electrical engineering, FAFEE 2022

作者： Tu, Chunming Liu, Chenxin Xiao, Fan Gun, Qi Ge, Pingjuan National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha410082 China State Grid Hunan Electric Power Corporation Limited Changsha Power Supply Company Changsha410015 China

ISBN: (纸本)9789819934034

Aiming at the problems that the existing fault location methods for distri-bution network with hybrid lines have poor adaptability of section location, a fault location method for distribution network with hybrid lines based on characteristic coefficient matrix is proposed. Firstly, the distribution network topology is analyzed to select reference nodes, and the inherent coefficient matrix is constructed based on the transmission characteristics of the line. Then, the difference between the coeffi-cient matrix before and after the fault is calculated to establish a fault discrimination matrix, and the fault section is determined according to the element distribution of the discrimination matrix. The simulation results show that the proposed method is simple and reliable, can accurately locate the fault location, and effectively improves the practicability of the distribution network fault location system. © Beijing Paike Culture Commu. Co., Ltd.

关键词： Location

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Fault Diagnosis technology of Low Voltage Circuit Breaker Based on Multilayer Perceptron 16th

Fault Diagnosis Technology of Low Voltage Circuit Breaker Ba...

引用

16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Yan, Siling Zhang, Gang Chen, Bei Li, Chenxu Liu, Yang Yang, Jingjian Power Supply Branch of Beijing Metro Operation Co. Ltd. Beijing100084 China Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China

ISBN: (纸本)9789811915314

Low voltage circuit breaker is the key equipment of distribution system, so it is of great significance to monitor its condition and diagnose its fault. In this paper, the vibration signals of many typical faults such as false closing, incomplete opening and jammed operating mechanism of low-voltage circuit breaker are collected, among which 30 groups of data are collected for each fault type;Then, based on the theory of information entropy, the concept of cross-correlation entropy is introduced, and the energy entropy, singular entropy, approximate entropy, sample entropy and fuzzy entropy of vibration signal are extracted as feature entropy. The principal component dimension reduction PCA method is used to fuse the feature entropy, and the two-dimensional feature matrix is obtained;Finally, MLP diagnosis method of multi-layer sensor is introduced, and parameters such as activation function, regularization coefficient, weight optimizer and test set proportion are optimized to realize fault diagnosis based on vibration signal. The test results show that the MLP based fault diagnosis method in this paper can achieve more than 98% diagnostic accuracy after model parameter optimization. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Failure analysis

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