本文選題：廣域保護(hù) + 綜合序分量��； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：隨著互聯(lián)電網(wǎng)規(guī)模和范圍的日益擴(kuò)大,區(qū)域電網(wǎng)之間的電氣聯(lián)系日益緊密,加之電力市場開放出現(xiàn)的運行方式多樣化以及大量新型控制技術(shù)的營運,使得電力系統(tǒng)網(wǎng)絡(luò)的穩(wěn)定特性越來越復(fù)雜,電網(wǎng)的穩(wěn)定性問題越來越需要關(guān)注。其中,振蕩過程中的再故障判別技術(shù)作為保障電網(wǎng)安全穩(wěn)定運行、降低大規(guī)模停電風(fēng)險、提高用戶用電可靠性和電能質(zhì)量的重要手段,有待于進(jìn)行深入研究。廣域測量系統(tǒng)(wide area measurement system,WAMS)的出現(xiàn)和通信技術(shù)的發(fā)展,為繼電保護(hù)向新的領(lǐng)域發(fā)展帶來了動力。本文研究利用廣域信息的大電網(wǎng)振蕩再故障的識別及故障元件判斷識別方法�？紤]到振蕩中系統(tǒng)的頻率偏移對濾序算法的影響,本文采用綜合序分量構(gòu)成差動電流,提出了一種用于識別互聯(lián)電網(wǎng)振蕩后再故障的差動保護(hù)原理,該原理利用聯(lián)絡(luò)線的單端綜合序分量作為啟動元件、雙端綜合序分量構(gòu)成差動保護(hù),能有效提高經(jīng)大過渡電阻接地的靈敏度,改善振蕩中心附近短路傳統(tǒng)負(fù)序元件靈敏度低的問題。為進(jìn)一步識別故障元件,設(shè)計了一種智能電子設(shè)備(intelligent electronic device,IED)的分類方式和表達(dá)方式,并給出了相應(yīng)的表達(dá)式。利用配合關(guān)系矩陣描述IED間的相互配合關(guān)系,并結(jié)合多點方向信息確定與故障元件直接相連的IED,這些IED保護(hù)對象的交集即為故障元件。算例分析表明,本文提出的廣域保護(hù)原理簡單易行,不受振蕩頻率偏移和系統(tǒng)運行方式影響,耐過渡電阻能力強,能很好實現(xiàn)振蕩再故障判斷及定位,作為現(xiàn)有振蕩再故障保護(hù)的冗余補充能有效提高保護(hù)性能。
[Abstract]:With the increasing expansion of the scale and scope of interconnected power grids, the electrical links between regional power grids are becoming increasingly close, coupled with the diversification of the operation modes of the open electricity market and the operation of a large number of new control technologies. The stability of power system becomes more and more complex, and the stability of power network needs more and more attention. Among them, as an important means to ensure the safe and stable operation of power network, reduce the risk of large-scale power outage, and improve the reliability and power quality of power consumption, the technology of re-fault identification in the oscillation process needs to be deeply studied. The emergence of wide area measurement system (WAMS) and the development of communication technology have brought the impetus to the development of relay protection in new fields. In this paper, a wide area information based method for the identification of large power grid oscillation re-fault and fault element identification is studied. Considering the influence of frequency shift of system on filtering algorithm, a differential protection principle is proposed to identify the oscillation fault of interconnected power network, which is composed of differential current by synthesizing sequence component. In this principle, the single terminal integrated sequence component of the tie line is used as the starting element, and the two-terminal integrated sequence component forms the differential protection, which can effectively improve the sensitivity of grounding through the large transition resistance. The problem of improving the sensitivity of conventional negative sequence elements near the oscillation center is low. In order to further identify the fault elements, a classification and expression method of intelligent electronic device (IEDs) for intelligent electronic devices is designed, and the corresponding expressions are given. The coordination relation between IED is described by using the coordination relation matrix, and the IEDs directly connected with the fault elements are determined with the multi-point direction information. The intersection of these IED protection objects is called the fault element. The analysis of an example shows that the principle of wide area protection proposed in this paper is simple and easy to carry out. It is independent of oscillation frequency offset and system operation mode, and has strong resistance to transition. As a redundant supplement to the existing oscillatory refault protection, the performance of the protection can be improved effectively.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM732

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 宋洪磊;吳俊勇;郝亮亮;冀魯豫;;基于WAMS和改進(jìn)拉普拉斯特征映射的同調(diào)機(jī)群在線識別[J];電網(wǎng)技術(shù);2013年08期

2 吳為;湯涌;孫華東;徐式蘊;;基于廣域量測信息的電力系統(tǒng)暫態(tài)穩(wěn)定研究綜述[J];電網(wǎng)技術(shù);2012年09期

3 劉宇;舒治淮;程逍;張勝祥;;從巴西電網(wǎng)“2·4”大停電事故看繼電保護(hù)技術(shù)應(yīng)用原則[J];電力系統(tǒng)自動化;2011年08期

4 孫鑫;張幼明;;智能電網(wǎng)中的廣域保護(hù)[J];東北電力技術(shù);2011年01期

5 李振興;尹項根;張哲;何志勤;;有限廣域繼電保護(hù)系統(tǒng)的分區(qū)原則與實現(xiàn)方法[J];電力系統(tǒng)自動化;2010年19期

6 尹項根;汪e，

本文編號：1904604