本文選題：小電流系統(tǒng)　切入點：相間短路　出處：《華北電力大學(北京)》2017年碩士論文　論文類型：學位論文

【摘要】：配電網(wǎng)在電力系統(tǒng)中與用電側(cè)相連具有至關(guān)重要的作用。經(jīng)濟的持續(xù)發(fā)展對配電網(wǎng)提出了更高的要求。提高供電可靠性和供電質(zhì)量、擴大供電能力、實現(xiàn)配電網(wǎng)高效經(jīng)濟運行是社會和供電公司的共同目標。配電自動化就是實現(xiàn)這些目標的重要手段。配電自動化包括配電運行自動化和配電管理自動化。配電運行自動化包括配電運行監(jiān)控以及配電故障的識別、隔離和非故障區(qū)域恢復(fù)等。配電運行監(jiān)控是配電自動化的基礎(chǔ),配電網(wǎng)故障是影響配電網(wǎng)運行的重要因素。因此,研究配電網(wǎng)故障的特點及故障定位方案以及如何提升配電運行監(jiān)控的水平具有重要的理論和實際意義。本論文從作者實際工作出發(fā),針對鳳陽供電公司配電網(wǎng)的實際運行情況,就配電自動化中的故障定位方法及配電運行監(jiān)控方案進行了綜合研究,以期為鳳陽供電公司的配電自動化實際應(yīng)用提供參考。首先,本論文針對接地和短路兩種典型故障情況,分析了典型故障定位方法,并進行如何定位故障區(qū)段的應(yīng)用研究。根據(jù)故障邊界條件分析了中性點不接地的小電流系統(tǒng)和中性點經(jīng)消弧線圈接地的小電流系統(tǒng)的單相接地故障特性和相間短路故障特性,推導(dǎo)了上述故障情況下的復(fù)合序網(wǎng)圖,結(jié)合故障序網(wǎng)圖分析故障的特點,并依據(jù)不同故障的特點給出故障區(qū)段定位的策略。為實際生產(chǎn)中配電網(wǎng)單相接地故障及相間短路故障的快速定位提供理論支持。其次,隨著分布式電源的發(fā)展,其大規(guī)模并網(wǎng)指日可待。因此當配電網(wǎng)有分布式電源接入的情況下,如何簡單易行地對故障點進行定位,也是具有一定的研究價值。本文分析了分布式電源接入配電網(wǎng)對故障定位的影響,根據(jù)含分布式電源分支的數(shù)目對配網(wǎng)結(jié)構(gòu)的種類進行了劃分,并針對不同類型的配網(wǎng)結(jié)構(gòu)分別提出了故障定位的策略。最后,本文分析了當前鳳陽縣供電公司實際的配電網(wǎng)運行監(jiān)控現(xiàn)狀,針對當前配電網(wǎng)監(jiān)測信息不足的情況,提出利用用電信息采集系統(tǒng)的數(shù)據(jù)完善配電網(wǎng)監(jiān)測的解決方案。方案基于用電信息采集系統(tǒng)的終端、通信的復(fù)用。用電采集終端發(fā)起兩個連接,一個連接指向用電信息采集系統(tǒng),另一個連接指向配電自動化系統(tǒng),共用通信通道。采集終端生成兩個運行實例,分別響應(yīng)用電、配電系統(tǒng)的數(shù)據(jù)召喚。該解決方案對配電自動化系統(tǒng)自動化數(shù)據(jù)不足提供了很好的補充,也為配電調(diào)度人員了解配電網(wǎng)的潮流、執(zhí)行日常調(diào)度工作提供了有力的信息支撐。
[Abstract]:The distribution network plays an important role in connecting with the power side in the power system. The sustained development of economy has put forward higher requirements for the distribution network. The reliability and quality of the power supply are improved, and the power supply capacity is expanded. The realization of efficient and economical operation of distribution network is the common goal of society and power supply company. Distribution automation is an important means to achieve these goals. Distribution automation includes distribution operation automation and distribution management automation. Line automation includes monitoring of distribution operations and identification of distribution failures, Distribution operation monitoring is the basis of distribution automation, distribution network failure is an important factor affecting distribution network operation. It is of great theoretical and practical significance to study the characteristics of distribution network faults and the scheme of fault location and how to improve the level of distribution operation monitoring. Based on the author's practical work, this paper aims at the actual operation of the distribution network of Fengyang Power supply Company. In order to provide a reference for the practical application of distribution automation in Fengyang Power supply Company, this paper makes a comprehensive study on the fault location method in distribution automation and the monitoring scheme of distribution operation in order to provide a reference for the practical application of distribution automation in Fengyang Power supply Company. Firstly, this paper aims at two typical fault situations: grounding and short circuit. The typical fault location method is analyzed. According to the fault boundary condition, the characteristics of single-phase grounding fault and inter-phase short-circuit fault of small current system with neutral point ungrounded and small current system with neutral point grounded by arc-suppression coil are analyzed. In this paper, the complex sequence network diagram under the above fault condition is deduced, and the fault characteristics are analyzed by combining the fault sequence network graph. According to the characteristics of different faults, the strategy of fault section location is given, which provides theoretical support for the fast location of single-phase grounding fault and inter-phase short-circuit fault in distribution network. Secondly, with the development of distributed generation, Therefore, when the distribution network has distributed power access, how to easily locate the fault point, This paper analyzes the influence of distributed power supply access to distribution network on fault location, and divides the type of distribution network structure according to the number of branches of distributed power supply. Finally, this paper analyzes the actual situation of distribution network operation monitoring in Fengyang County, aiming at the current situation of insufficient information of distribution network monitoring, and puts forward the strategy of fault location for different types of distribution network structure, finally, this paper analyzes the actual situation of distribution network operation monitoring in Fengyang power supply company. This paper presents a solution to improve the distribution network monitoring by using the data of the electric information acquisition system. The scheme is based on the terminal of the power information acquisition system, the reuse of communication, and the initiation of two connections between the two terminals. One connection points to the power information acquisition system, the other to the distribution automation system, sharing the communication channel. The solution not only provides a good supplement to the shortage of data in distribution automation system, but also provides a powerful information support for distribution dispatchers to understand the power flow of distribution network and carry out daily dispatching work.
【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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