本文選題：高壓直流輸電線路 + 線路保護(hù)　； 參考：《華南理工大學(xué)》2016年碩士論文

【摘要】：高壓直流輸電線路是直流輸電系統(tǒng)的重要組成部分,在直流線路發(fā)生故障或受到擾動(dòng)時(shí),線路保護(hù)能準(zhǔn)確區(qū)分故障和擾動(dòng)并可靠動(dòng)作對于直流輸電系統(tǒng)安全穩(wěn)定運(yùn)行至關(guān)重要。目前直流線路保護(hù)仍存在保護(hù)判據(jù)間的時(shí)序配合不當(dāng)、保護(hù)間的時(shí)序配合不當(dāng)及保護(hù)邏輯設(shè)計(jì)不當(dāng)?shù)膯栴}。針對上述情況,本文以直流輸電線路保護(hù)為研究對象,對于行波保護(hù)因保護(hù)判據(jù)間時(shí)序配合不當(dāng)導(dǎo)致保護(hù)誤動(dòng)、行波保護(hù)和微分欠壓保護(hù)因保護(hù)間時(shí)序配合不當(dāng)導(dǎo)致保護(hù)動(dòng)作失去選擇性和縱差保護(hù)因保護(hù)邏輯設(shè)計(jì)不當(dāng)導(dǎo)致在高阻接地故障下保護(hù)拒動(dòng)等問題開展研究。針對行波保護(hù)在發(fā)生雷擊故障時(shí)保護(hù)判據(jù)間時(shí)序配合不當(dāng)導(dǎo)致行波保護(hù)發(fā)生保護(hù)誤動(dòng)的問題,本文通過研究對比了直流線路接地故障和直流線路雷擊故障時(shí)行波保護(hù)判據(jù)間的時(shí)序配合特性,發(fā)現(xiàn)接地故障下行波保護(hù)在進(jìn)行故障判別時(shí)其判據(jù)邏輯只會(huì)出現(xiàn)一次高電平信號(hào),雷擊故障下行波保護(hù)在進(jìn)行故障判別時(shí)其判據(jù)邏輯會(huì)在一段時(shí)間內(nèi)多次出現(xiàn)高電平信號(hào)的保護(hù)判據(jù)配合特征,進(jìn)而提出優(yōu)化行波保護(hù)判據(jù)間配合關(guān)系的改進(jìn)建議,即當(dāng)任意一個(gè)判據(jù)在滿足保護(hù)定值并且輸出高電平展寬后,在之后的一段時(shí)間內(nèi)該保護(hù)判據(jù)邏輯都不能再輸出高電平,防止因保護(hù)判據(jù)反復(fù)滿足保護(hù)定值而出現(xiàn)行波保護(hù)誤動(dòng)的情況。針對在直流線路接地故障下行波保護(hù)和微分欠壓保護(hù)動(dòng)作失去選擇性問題,本文結(jié)合行波保護(hù)和微分欠壓保護(hù)的原理和動(dòng)作邏輯,同時(shí)通過仿真分析明確了產(chǎn)生該問題的原因是微分欠壓保護(hù)的閉鎖信號(hào)——“直流線路故障重啟信號(hào)RESSFP”響應(yīng)時(shí)間滯后微分欠壓保護(hù)動(dòng)作時(shí)間,因此該閉鎖信號(hào)無法在行波保護(hù)動(dòng)作后可靠閉鎖微分欠壓保護(hù),最后提出在微分欠壓保護(hù)閉鎖邏輯中增加行波保護(hù)動(dòng)作閉鎖信號(hào)的改進(jìn)建議。仿真表明,改進(jìn)方案保證了保護(hù)的選擇性也兼顧了可靠性。針對在直流線路高阻接地故障下縱差保護(hù)拒動(dòng)而極保護(hù)動(dòng)作將故障極閉鎖的問題,本文結(jié)合縱差保護(hù)原理和保護(hù)動(dòng)作邏輯,同時(shí)通過仿真分析明確了產(chǎn)生該問題的原因是由于保護(hù)邏輯中的“延時(shí)閉鎖邏輯”將縱差保護(hù)閉鎖600 ms,使縱差保護(hù)出口總延時(shí)在1.1 s以上,最后提出了在縱差保護(hù)邏輯中加入交流電壓UAC閉鎖判據(jù)的改進(jìn)建議。仿真表明,改進(jìn)后縱差保護(hù)兼顧了保護(hù)的可靠性和速動(dòng)性。本文研究成果為現(xiàn)場運(yùn)行人員對于直流線路故障分析的思路、方法提供了參考,同時(shí)為直流線路繼電保護(hù)運(yùn)行和設(shè)計(jì)提供了理論依據(jù),對直流輸電系統(tǒng)安全穩(wěn)定有著重大意義。本文工作得到國家自然科學(xué)基金(51377059)的資助,部分研究成果已經(jīng)在實(shí)際直流工程詳細(xì)模型EMTDC仿真平臺(tái)上驗(yàn)證了其正確性和有效性。
[Abstract]:HVDC transmission line is an important part of HVDC transmission system. It is very important for the safe and stable operation of HVDC system that line protection can accurately distinguish fault from disturbance and operate reliably when the HVDC line fails or is disturbed. At present, there are still some problems in DC line protection, such as improper timing coordination among protection criteria, improper timing coordination among protection criteria and improper design of protection logic. In view of the above situation, this paper takes the DC transmission line protection as the research object. For the traveling wave protection, the protection malfunction is caused by the improper timing coordination between the protection criteria. Traveling wave protection and differential undervoltage protection due to the improper timing of protection between protection due to the loss of selectivity of protection action and longitudinal differential protection due to improper protection logic design led to the protection of high resistance to ground fault protection problems such as failure to carry out research. In view of the maloperation of traveling wave protection caused by improper timing coordination between the protection criteria when lightning strike failure occurs, In this paper, the timing matching characteristics of traveling wave protection criterion for DC line grounding fault and DC line lightning strike fault are studied and compared. It is found that only one high level signal appears in the criterion logic of downlink wave protection for grounding fault. The criterion logic of the downlink protection of lightning strike fault will appear many times in a period of time when the fault of downlink protection is judged, and the coordination characteristics of the protection criterion of the high level signal will appear many times, and the improvement of the coordination relationship between the criteria of the traveling wave protection is put forward. That is, when any criterion meets the protection limit and outputs high level broadening, the protection criterion logic can no longer output high level for a period of time thereafter. To prevent the traveling wave protection maloperation because the protection criterion meets the protection value repeatedly. Aiming at the problem of loss of selectivity of downlink wave protection and differential undervoltage protection in grounding fault of DC line, the principle and operation logic of traveling wave protection and differential undervoltage protection are combined in this paper. At the same time, through the simulation analysis, it is clear that the reason for this problem is the delay of differential under-voltage protection action time of the "DC line fault restart signal RESSFP" response time, which is the lock-in signal of differential under-voltage protection. Therefore, the locking signal can not be reliably latched after the traveling wave protection operation. Finally, the improvement suggestion of adding the traveling-wave protection action latchup signal to the differential undervoltage protection latch-up logic is put forward. Simulation results show that the improved scheme ensures both the selectivity and reliability of the protection. In view of the problem that the pole protection of longitudinal differential protection will lock the fault pole in the case of high resistance grounding fault of DC line, this paper combines the principle of longitudinal differential protection and the logic of protection operation. At the same time, through the simulation analysis, the reason for this problem is that the delay latchup logic in the protection logic will lock the longitudinal differential protection to 600msso that the total delay of the longitudinal differential protection outlet is more than 1.1 s. Finally, an improved criterion of AC voltage UAC latchup is proposed in the longitudinal differential protection logic. The simulation results show that the improved differential protection takes into account both the reliability and the rapidity of the protection. The research results in this paper provide a reference for the field operators to analyze the fault of DC line, and provide a theoretical basis for the operation and design of DC relay protection, which is of great significance to the safety and stability of HVDC transmission system. This paper is supported by the National Natural Science Foundation of China 51377059. Some of the research results have been verified on the EMTDC simulation platform of practical DC engineering.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM75;TM77

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