發(fā)布時(shí)間：2018-04-02 16:36

  本文選題：配電網(wǎng)　切入點(diǎn)：消弧柜　出處：《長沙理工大學(xué)》2014年碩士論文

【摘要】：線路接地故障和變壓器內(nèi)部接地故障辨識問題是經(jīng)消弧柜接地配電網(wǎng)亟待解決的一大難題。經(jīng)消弧柜接地配電網(wǎng)采用中性點(diǎn)不接地的方式,不需使用消弧線圈,當(dāng)線路發(fā)生單相接地故障時(shí),將安裝在母線處的消弧柜合閘,解決了弧光接地故障帶來的危害。但同時(shí)也帶來了變壓器內(nèi)部故障時(shí)消弧柜誤動而使變壓器內(nèi)部繞組短路的威脅。因此如何辨識線路故障和變壓器故障并使消弧柜正確動作是維護(hù)電網(wǎng)安全穩(wěn)定運(yùn)行的重要研究內(nèi)容。為此,論文旨在發(fā)現(xiàn)現(xiàn)有辨識方法存在的不足,研究新的辨識方法,提出了基于多信息融合的故障辨識方法以及消弧柜動作后的故障二次辨識方法,并對消弧柜進(jìn)行相應(yīng)的投入控制。為解決經(jīng)消弧柜接地配電網(wǎng)線路故障和變壓器故障的辨識難題,論文分析了上述兩種故障情況下變壓器出口和各線路首端零序電流和負(fù)序電流大小、相位等故障信息,計(jì)算了各條線路首端與變壓器出口的序電流比值,分別構(gòu)建了基于零序電流標(biāo)幺值的辨識判據(jù)和基于負(fù)序電流標(biāo)幺值的辨識判據(jù),分別提出了基于零序電流和負(fù)序電流的故障辨識方法；并根據(jù)序電流的相位差別構(gòu)建了基于序電流相位的辨識判據(jù),提出了基于序電流相位的故障辨識方法。為充分挖掘故障信息,全面刻畫故障狀態(tài),論文分析在線路故障和變壓器內(nèi)部故障情況下監(jiān)測出口零序電流和零序電壓導(dǎo)數(shù)之間的關(guān)系,提出了基于相關(guān)分析的故障辨識方法。比較論文提出的四種辨識方法的優(yōu)缺點(diǎn)及適用范圍,構(gòu)建基于多判據(jù)的信息融合辨識判據(jù),提出了基于多信息融合的故障辨識方法,并根據(jù)辨識結(jié)果對消弧柜進(jìn)行相應(yīng)的投入控制。該辨識方法不受系統(tǒng)運(yùn)行方式及參數(shù)的影響,可靠性高針對特定情況下辨識錯(cuò)誤而消弧柜誤動的情況,通過檢測消弧柜動作后流經(jīng)消弧柜的電流的大小來重新辨識故障,提出了消弧柜動作后的故障二次辨識方法和消弧柜投入控制策略,避免了消弧柜誤動而引發(fā)變壓器內(nèi)部繞組短路而使變壓器燒毀等嚴(yán)重事故。通過MATLA和EMTP仿真驗(yàn)證,上述故障辨識方法能對經(jīng)消弧柜接地配電網(wǎng)中的線路故障和變壓器故障進(jìn)行準(zhǔn)確辨識,并對消弧柜進(jìn)行相應(yīng)投入控制,實(shí)現(xiàn)了變壓器繞組100%的保護(hù),避免了變壓器內(nèi)部故障時(shí)消弧柜誤動作引起變壓器燒壞等事故的發(fā)生,辨識精度和可靠性高,有待在經(jīng)消弧柜接地配電網(wǎng)中推廣應(yīng)用。
[Abstract]:The identification of line grounding fault and transformer internal grounding fault is a difficult problem to be solved urgently in the grounding distribution network through the arc-suppression cabinet.When the single phase grounding fault occurs, the arc-suppression cabinet will be installed in the busbar to close the arc-suppression cabinet, which solves the harm caused by the arc-light grounding fault.But at the same time, it also brings about the threat of short-circuit in transformer inner windings because of the maloperation of arc-suppression cabinet.Therefore, how to identify line faults and transformer faults and make the arc-suppression cabinet operate correctly is an important research content to maintain the safe and stable operation of power grid.Therefore, the purpose of this paper is to find out the shortcomings of the existing identification methods, to study new identification methods, and to propose a fault identification method based on multi-information fusion and a secondary fault identification method after the operation of the silencer.And the corresponding input control to the arc suppression cabinet.In order to solve the problem of fault identification of distribution network line and transformer fault through arc-suppression cabinet, the fault information of zero sequence current and negative sequence current at the outlet of transformer and the first end of each line are analyzed in this paper, such as the magnitude and phase of the zero sequence current and negative sequence current at the first end of each line.The sequence current ratio between the first end of each line and the outlet of the transformer is calculated, and the identification criteria based on the zero sequence current standard and the negative sequence current standard unitary value are constructed, respectively.The fault identification method based on zero sequence current and negative sequence current is proposed, and the identification criterion based on sequence current phase is constructed according to the phase difference of sequence current, and the fault identification method based on sequence current phase is proposed.In order to fully mine fault information and depict the fault state, the relationship between zero-sequence current and zero-sequence voltage derivative is analyzed in this paper, and a fault identification method based on correlation analysis is proposed.By comparing the advantages and disadvantages of the four identification methods proposed in this paper, the information fusion identification criterion based on multi-criteria is constructed, and the fault identification method based on multi-information fusion is proposed.According to the identification results, the corresponding input control of the arc suppression cabinet is carried out.The identification method is not affected by the operation mode and parameters of the system, and the fault is identified by detecting the magnitude of the current flowing through the silencer by detecting the magnitude of the current flowing through the silencer after the operation of the silencer.The second identification method of the fault after the operation of the silencer and the input control strategy of the silencer are put forward to avoid serious accidents such as fault operation of the silencing cabinet and short circuit of the inner winding of the transformer and the burning of the transformer.The simulation results of MATLA and EMTP show that the above fault identification method can accurately identify the line faults and transformer faults in the grounding distribution network through the arc-suppression cabinet, and the corresponding input control of the arc-suppression cabinet can realize 100% protection of the transformer windings.It can avoid accidents such as burning out of transformer caused by maloperation of arc suppression cabinet inside fault of transformer, and has high identification precision and reliability. It needs to be popularized and applied in distribution network through arc-suppression cabinet grounding.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM862

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 王艷松;解飛;;配電網(wǎng)單相接地故障的仿真分析[J];高電壓技術(shù);2008年01期

，

本文編號：1701232