本文選題：帶分支配電網(wǎng) + 離線　； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：配電網(wǎng)作為連接輸電網(wǎng)和用戶的紐帶,在電力分配中扮演著重要的角色。但由于配電網(wǎng)分支較多,拓?fù)浣Y(jié)構(gòu)復(fù)雜、覆蓋區(qū)域較廣,加之近年來分布式電源(Distributed Generation,DG)的接入,傳統(tǒng)的故障定位方法已經(jīng)不適用。配電線路廣泛應(yīng)用在城鎮(zhèn)、農(nóng)村,它的運(yùn)行情況直接影響到終端用戶的用電質(zhì)量。若能對(duì)配電網(wǎng)故障,尤其是帶分支的配電網(wǎng)單相接地故障進(jìn)行快速有效的定位,這對(duì)整個(gè)電力系統(tǒng)的穩(wěn)定安全和經(jīng)濟(jì)運(yùn)行都具有十分重要的意義。然而,現(xiàn)階段配電網(wǎng)故障定位大多依賴需要精確對(duì)時(shí)的測(cè)距系統(tǒng),對(duì)通信設(shè)備的要求較為嚴(yán)苛,成本較大,廣大的農(nóng)村配電網(wǎng)適應(yīng)性較差。單相接地故障是配電網(wǎng)發(fā)生率最高的一類故障。發(fā)生單相接地故障時(shí),非故障相電壓上升為線電壓,產(chǎn)生的過電壓很可能導(dǎo)致設(shè)備燒毀擊穿,也可能產(chǎn)生電弧,引起相間短路,從而擴(kuò)大事故范圍。許多年來,國內(nèi)外學(xué)者對(duì)單相接地故障問題給予了很多的關(guān)注,提出了不同的故障定位方法。但由于配電網(wǎng)本身結(jié)構(gòu)復(fù)雜和其他種種原因,故障定位的準(zhǔn)確率一直不高。在實(shí)際應(yīng)用中,行之有效的方式依舊采用拉閘選線結(jié)合人工巡線的方式查找故障點(diǎn),這種方式不僅耗時(shí)耗力,降低電網(wǎng)的供電可靠性,也不契合當(dāng)代的配電網(wǎng)向自動(dòng)化的發(fā)展趨勢(shì)。鑒于此,本文提出一種基于雙頻信號(hào)注入的配電網(wǎng)多分支故障定位方法。在此方法中,為避免諧波的干擾,選擇在離線的狀態(tài)下,用信號(hào)源向帶分支配電網(wǎng)中注入兩種不同頻率的高頻信號(hào),通過對(duì)電壓和電流信號(hào)的提取,并依據(jù)傳輸方程,遍歷線路全長,最后利用診信方程求解出故障距離。本文分別對(duì)直配線和帶分支結(jié)構(gòu)的配電網(wǎng)單相接地故障測(cè)距進(jìn)行建模仿真,基于在相異千赫茲的診信頻率下,真故障的值不變,偽故障的值不同的判據(jù),有效的測(cè)出真實(shí)故障距離,剔除了等效故障。仿真表明,該方法能快速、準(zhǔn)確的實(shí)現(xiàn)直配線和帶分支配電線路故障的有效辨識(shí)和故障距離的測(cè)定,是一種比較有效的測(cè)距方法。
[Abstract]:As a link between transmission network and users, distribution network plays an important role in power distribution. However, due to the large number of branches, complex topology, wide coverage and the access of distributed Generation (DG) in recent years, the traditional fault location method is no longer applicable. Distribution line is widely used in towns and villages, its operation directly affects the power quality of the end users. If the fault of distribution network, especially the single-phase grounding fault with branches, can be located quickly and effectively, it will be of great significance to the stability, safety and economic operation of the whole power system. However, at this stage, most of the distribution network fault location depends on accurate and timely location system, the requirements of the communication equipment is more stringent, the cost is high, the wide range of rural distribution network adaptability is poor. Single-phase grounding fault is one of the most common faults in distribution network. When a single-phase grounding fault occurs, the non-fault phase voltage rises to a line voltage, which may cause the equipment to burn out and break down, also may produce arc, which will cause inter-phase short circuit, thus extending the range of accidents. For many years, scholars at home and abroad have paid much attention to the problem of single-phase grounding fault, and put forward different fault location methods. However, due to the complexity of distribution network structure and other reasons, the accuracy of fault location has not been high. In the practical application, the effective way still adopts the way of selecting the line by pulling and combining with the manual inspection to find the fault point, this way not only time-consuming and labor-consuming, but also reduces the power supply reliability of the power network. Also does not accord with the contemporary distribution network to the automation development trend. In view of this, a multi-branch fault location method based on dual-frequency signal injection is proposed in this paper. In this method, in order to avoid harmonic interference, two kinds of high frequency signals with different frequencies are injected into the distribution network with branch by signal source under the condition of off-line, by extracting the voltage and current signals, and according to the transmission equation, The whole length of the line is traversed, and the fault distance is solved by using the diagnostic signal equation. This paper models and simulates single-phase grounding fault location of distribution network with direct distribution line and branch structure, based on the criterion that the value of true fault is invariant and the value of pseudo-fault is different under the different KHz diagnostic frequency. The true fault distance is effectively measured and the equivalent fault is eliminated. The simulation results show that this method can quickly and accurately identify the faults of direct distribution lines and distribution lines with branches and determine the fault distance. It is a more effective method for location.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM755

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相關(guān)期刊論文 前10條

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本文編號(hào)：1879383