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Classification of Transmission Line Ground Short Circuit Fault Based on co.volutional Neural Network

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 co.mon in the power *** order to prevent the power system from aggravating the accident caused by short-circuit faults of transmission lines,a novel co.volutional neural network(CNN)model is co.structed to identify the short-circuit fault of the transmission line in the power *** CNN model is mainly co.sisted of five co.volutional layers,three max-pooling layers,one co.catenate layer,one dropout layer,one fully co.nected 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 co.responds 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： co.volutional neural networks transmission line fault classification

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Parameters Identification for Extended Debye Model of XLPE Cables Based on Sparsity-Promoting Dynamic Mode Deco.position Method

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Energy Engineering 2023年第10期120卷 2433-2448页

作者： Weijun Wang Min Chen Hui Yin Yuan Li Guiyang power supply bureau Guizhou Power Grid Co.Ltd.Guiyang550004China co.lege of Electrical Engineering Sichuan UniversityChengdu610065China

To identify the parameters of the extended Debye model of XLPE cables,and therefore evaluate the insulation performance of the samples,the sparsity-promoting dynamicmode deco.position(SPDMD)methodwas introduced,aswell the basics and processes of its applicationwere *** amplitude vector based on polarization current was first *** on the non-zero elements of the vector,the number of branches and parameters including the co.fficients and time co.stants of each branch of the extended Debye model were *** research on parameter identification of XLPE cables at different aging stages based on the SPDMD method was carried out to verify the practicability of the *** with the traditional differential method,the simulation and experiment indicated that the SPDMD method can effectively avoid problems such as the relaxation peak being unobvious,and possessing more accuracy during the parameter *** due to the polarization current being less affected by the measurement noise than the depolarization current,the SPDMD identification results based on the polarization current spectral line proved to be better at reflecting the response characteristics of the *** addition,the time domain polarization current test results can be co.verted into the frequency domain,and then used to obtain the dielectric loss factor spectrum of the *** integral of the dielectric loss factor on a frequency domain can effectively evaluate the insulation co.dition of the XLPE cable.

关键词： Cable insulation dielectric response sparsity-promoting dynamic mode deco.position parameter identification

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Functional Analysis on Superposition of Harmonic Sources in AC Arc-furnaces

Functional Analysis on Superposition of Harmonic Sources in ...

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International co.ference on Industrial Technology and Management Science(ITMS 2015)

作者： Pu Deng Feng-yuan Wang Xiao-bo Liu Xian-song Pi Hong-li Li power grid Planning and Research Center Guizhou Power Grid Corporation guizhou University Duyun Electric power bureau

To solve the problem of harmonic level evaluation for AC arc-furnace supply area, this paper analyses the synchronous measuring data of harmonic current in AC arc-furnaces with functional analysis, verifies harmonic current released from AC arc-furnaces with independence and orthogonality approximately between each other, proves superposition of harmonic current in acco.dance with root of sum of squares, derives the formula for evaluating harmonic voltage level of PCC at which AC arc-furnaces were co.nected. The formula is verified Actually, it shows that multi-arc-furnaces harmonic current can be largely co.nteracted each other, If these AC arc-furnaces were co.nected to a PCC in which short-circuit capacity is enough for that the superposed harmonic current of AC arc-furnaces can be electromagnetic co.patible, then power quality of the PCC can reach the qualified level.

关键词： AC arc-furnace superposition of harmonic current orthogonal co.plex-valued co.co.relativity co.fficient evaluation of harmonic level

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