【摘要】：配電網(wǎng)是整個電力系統(tǒng)最末端的環(huán)節(jié),直接面向用戶,是保證供電質(zhì)量、提高電網(wǎng)運行效率、創(chuàng)新用戶服務的關鍵環(huán)節(jié),其中的任何故障、電能質(zhì)量擾動都會影響對用戶的正常供電。而且配電網(wǎng)結(jié)構復雜、形式多變,又是整個電網(wǎng)系統(tǒng)中最容易發(fā)生故障的環(huán)節(jié),據(jù)統(tǒng)計配網(wǎng)故障占全網(wǎng)故障90%以上,極大地影響了系統(tǒng)的供電可靠性和供電質(zhì)量。隨著自動化設備和通信技術的發(fā)展、新保護控制技術的出現(xiàn)以及對供電質(zhì)量要求的提高,以自愈為特征的智能配電網(wǎng)是未來配電網(wǎng)發(fā)展的必然趨勢。因此,研究智能配電網(wǎng)自愈控制技術,減少故障引起的停電次數(shù)與停電時間、提高供電可靠性,十分必要。 針對將來智能配電網(wǎng)對供電可靠性不斷提高的發(fā)展需求,對智能配電網(wǎng)故障自愈技術進行了研究。首先對現(xiàn)有的配電網(wǎng)自愈情況進行總結(jié),自愈控制的實現(xiàn)方法有三種：集中控制方式,分布式智能控制方式和集中—分布式智能協(xié)調(diào)控制方式,并分析了對應方法的優(yōu)缺點。針對lOkV配電網(wǎng),通過大量理論分析和多次現(xiàn)場實際調(diào)研,研究了基于廣域測控系統(tǒng)、EPON無源開放式通信體系和分布式智能的故障識別與隔離保護控制技術,采用了集中—分布式智能協(xié)調(diào)控制方式實現(xiàn)故障識別與隔離,設計了一套針對1OkV配電網(wǎng)饋線的故障快速隔離控制方案,通過分析故障過流信息實現(xiàn)與變電站出線保護相配合的故障快速隔離、供電恢復等功能。根據(jù)實際的調(diào)研情況,發(fā)現(xiàn)了異地兩點接地短路問題和變電站饋線出口至饋線首個智能終端間故障死區(qū)問題,結(jié)合現(xiàn)有的故障隔離控制技術和饋線結(jié)構,提出了具體的解決方案和實現(xiàn)方法。并在靜模實驗平臺上對上述故障隔離控制方法進行試驗,在試驗結(jié)果滿足規(guī)定和要求的情況下,在X市選取4條10kV饋線作為實施線路,建設示范應用工程,把故障識別與隔離保護控制技術應用在實際配電網(wǎng)中。通過實際應用工程的驗證,基于廣域信息的10kV配電網(wǎng)故障快速識別與隔離控制技術能夠有效地提高系統(tǒng)的供電可靠性和電能質(zhì)量,減少用戶的停電損失。
[Abstract]:Distribution network is the end of the whole power system, directly facing users, is the key link to ensure the quality of power supply, improve the efficiency of grid operation, and innovate customer service. Power quality disturbance will affect the normal power supply to users. And the distribution network structure is complex, the form is changeable, and it is the most prone to fault in the whole power system. According to statistics, the distribution network fault accounts for more than 90% of the whole network fault, which greatly affects the power supply reliability and power supply quality of the system. With the development of automation equipment and communication technology, the emergence of new protection and control technology and the improvement of power supply quality, the intelligent distribution network characterized by self-healing is the inevitable trend of distribution network development in the future. Therefore, it is necessary to study the self-healing control technology of intelligent distribution network, reduce the number and time of power outages caused by faults, and improve the reliability of power supply. In order to improve the reliability of power supply in smart distribution network, the fault self-healing technology of smart distribution network is studied in this paper. Firstly, the existing self-healing situation of distribution network is summarized. There are three methods to realize self-healing control: centralized control, distributed intelligent control and centralized distributed intelligent coordinated control, and the advantages and disadvantages of the corresponding methods are analyzed. In view of lOkV distribution network, through a lot of theoretical analysis and field investigation, the technology of fault identification and isolation protection control based on wide area measurement and control system, EPON passive open communication system and distributed intelligence is studied. The centralized distributed intelligent coordinated control method is adopted to realize fault identification and isolation. A fast fault isolation control scheme for feeder of 1OkV distribution network is designed. By analyzing the information of fault overcurrent, the functions of fault isolation and power supply recovery are realized. According to the actual investigation, the problem of fault dead zone between the feeder outlet of substation and the first intelligent terminal of feeder is found, combined with the existing fault isolation control technology and feeder structure. The concrete solution and implementation method are put forward. The above fault isolation control methods are tested on the static model experiment platform. Under the condition that the test results meet the requirements and regulations, four 10kV feeder lines are selected as the implementation lines in X City, and the demonstration application project is built. The fault identification and isolation protection control technology is applied in the actual distribution network. Through the verification of practical application engineering, the fast fault identification and isolation control technology of 10kV distribution network based on wide area information can effectively improve the power supply reliability and power quality of the system, and reduce the power loss of users.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM711

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