【摘要】：配電網(wǎng)是連接電力生產(chǎn)和用電用戶的橋梁,直接面向用戶,關(guān)系著供電安全和供電可靠性的優(yōu)劣。隨著國民經(jīng)濟的迅猛發(fā)展和人民生活水平日益提高,用電用戶對供電質(zhì)量的要求也隨著提高,配電網(wǎng)故障后快速、小范圍、少人工干預情況下的故障識別、隔離以及供電恢復的需求越來越迫切。本文分析了中性點經(jīng)消弧線圈接地系統(tǒng)單相接地故障特征,研究和比較了基于穩(wěn)態(tài)分量的故障識別與定位相關(guān)理論,提出采用并聯(lián)中電阻的消弧線圈接地選線裝置能提高選線成功率。分析了杭州地區(qū)消弧線圈運行現(xiàn)狀,針對當前消弧線圈普遍容量不足、選線不準的問題,提出了兩種優(yōu)化和改造方案。討論了經(jīng)消弧線圈接地的小電流系統(tǒng)單相接地故障下暫態(tài)零序電流的相頻特性,利用特征頻帶內(nèi)故障線路暫態(tài)零序電流幅值大于健全線路的原理,基于自適應捕捉特征頻帶內(nèi)暫態(tài)零序電流特征設計了接地選線裝置,通過在某變電站內(nèi)的試運行驗證了該選線裝置的原理和設計符合現(xiàn)場需求,能夠快速定位單相接地故障線路,減少了接地試拉操作,提高了供電可靠性。本文還探討了配電自動化建設對于一次網(wǎng)架結(jié)構(gòu)、主站系統(tǒng)、子站系統(tǒng)、配電終端等各方面的需求�；谂潆娮詣踊到y(tǒng)研究了配電網(wǎng)故障識別與定位的原理,并給出了相應算法,通過該算法可以快速有效地識別故障點。針對配電網(wǎng)架空線路和電纜線路,分別提出了繼電保護與配電自動化系統(tǒng)配合隔離故障區(qū)段的方案。討論了杭州供電公司配電網(wǎng)自動化建設方案,通過案例論證了該框架下配電網(wǎng)故障識別、定位與隔離方案的可行性。提出了一種變電站10kV母線全停故障下的配電網(wǎng)快速復電及負荷轉(zhuǎn)供方案,并在杭州公司配電自動化系統(tǒng)中設計了該方案的功能模塊,實現(xiàn)了變電站10kV母線故障全停引起大規(guī)模停電情況下,快速有效地配電線路供電恢復及負荷轉(zhuǎn)供,縮短了停電時間。
[Abstract]:Distribution network is a bridge between electricity production and power consumption. It is directly oriented to users, which is related to the security of power supply and the reliability of power supply. With the rapid development of the national economy and the improvement of people's living standards, the requirements of power users for the quality of power supply are also increasing. The fault identification in the case of quick, small scope and less manual intervention after the fault of the distribution network. The need for isolation and restoration of power supply is becoming more and more urgent. In this paper, the characteristics of single-phase grounding fault of neutral point grounding system through arc suppression coil are analyzed, and the theory of fault identification and location based on steady-state component is studied and compared. It is proposed that the arc suppression coil grounding line selection device with parallel intermediate resistance can improve the success rate of line selection. Based on the analysis of the current situation of arc suppression coil operation in Hangzhou, two optimization and modification schemes are put forward to solve the problem that the current arc suppression coil is generally insufficient in capacity and the selection of wires is not allowed. The phase-frequency characteristics of transient zero-sequence current in single-phase grounding fault of small current system grounded by arc suppression coil are discussed. The principle that the amplitude of transient zero-sequence current of fault line in characteristic frequency band is larger than that of sound line is used. A grounding line selection device is designed based on adaptive capture of transient zero sequence current characteristics in the characteristic frequency band. The principle and design of the line selection device meet the field requirements through trial operation in a substation. It can quickly locate the single-phase grounding fault line, reduce the grounding test operation, and improve the reliability of power supply. This paper also discusses the requirements of primary grid structure, master station system, sub-station system, distribution terminal and so on in the construction of distribution automation. Based on the distribution automation system, the principle of fault identification and location of distribution network is studied, and the corresponding algorithm is given, through which the fault points can be identified quickly and effectively. Aiming at overhead line and cable line of distribution network, the scheme of fault isolation between relay protection and distribution automation system is proposed. This paper discusses the construction scheme of distribution network automation in Hangzhou Power supply Company, and demonstrates the feasibility of the scheme of fault identification, location and isolation of distribution network under the framework of a case. In this paper, a fast recovery and load transfer scheme for distribution network with all-stop fault of 10kV bus in substation is put forward, and the function module of the scheme is designed in the distribution automation system of Hangzhou Company. In the case of large-scale power outage caused by 10kV bus failure in substation, the power supply recovery and load transfer of distribution line can be realized quickly and effectively, and the blackout time can be shortened.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM76

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