本文選題：繼電保護(hù) + 隱藏故障��； 參考：《華中科技大學(xué)》2014年碩士論文

【摘要】：隨著電網(wǎng)結(jié)構(gòu)復(fù)雜性和運(yùn)行不確定性的不斷增加，電力系統(tǒng)的運(yùn)行可靠性面臨著日趨嚴(yán)峻的挑戰(zhàn)，繼電保護(hù)系統(tǒng)的隱藏故障是影響電力系統(tǒng)運(yùn)行可靠性的主要因素之一。對(duì)繼電保護(hù)系統(tǒng)隱藏故障進(jìn)行建模分析，有助于研究隱藏故障的產(chǎn)生機(jī)理，辨識(shí)保護(hù)系統(tǒng)的薄弱環(huán)節(jié)；對(duì)繼電保護(hù)系統(tǒng)隱藏故障進(jìn)行風(fēng)險(xiǎn)評(píng)估，有助于分析連鎖故障發(fā)展過程，識(shí)別系統(tǒng)中的關(guān)鍵線路和高風(fēng)險(xiǎn)故障路徑。研究繼電保護(hù)系統(tǒng)隱藏故障的相關(guān)問題可以提高電網(wǎng)的運(yùn)行可靠性，對(duì)于提高電力系統(tǒng)安全穩(wěn)定水平方面起著至關(guān)重要的作用。 首先，分析了繼電保護(hù)系統(tǒng)隱藏故障的產(chǎn)生機(jī)理。從繼電保護(hù)裝置內(nèi)部元件功能故障、保護(hù)整定定值不合理、保護(hù)原理性失效和保護(hù)系統(tǒng)輔助元件故障四個(gè)方面研究產(chǎn)生隱藏故障的原因。分析發(fā)現(xiàn)繼電保護(hù)系統(tǒng)的隱藏故障具有多模式的特點(diǎn)。總結(jié)歸納了現(xiàn)有研究在處理隱藏故障問題時(shí)所采用的分析方法，，從概率和風(fēng)險(xiǎn)兩個(gè)角度闡述了各種方法的實(shí)現(xiàn)機(jī)理。 接著，研究了超高壓輸電線路繼電保護(hù)系統(tǒng)的隱藏故障。通過分析線路主保護(hù)、后備保護(hù)、斷路器裝置、斷路器失靈保護(hù)的隱藏故障，建立了多模式的隱藏故障模型。在該模型的基礎(chǔ)上，提出了電網(wǎng)N-k故障預(yù)想分析方法。從定值風(fēng)險(xiǎn)區(qū)間、距離III段躲負(fù)荷可靠性和斷路器裝置故障三個(gè)角度預(yù)想了電網(wǎng)可能存在的N-k故障路徑。算例分析表明：該方法有助于分析電網(wǎng)N-k故障的故障機(jī)理，辨識(shí)出一些重要的故障路徑，發(fā)現(xiàn)保護(hù)系統(tǒng)的薄弱環(huán)節(jié)。 最后，評(píng)估了繼電保護(hù)系統(tǒng)隱藏故障的風(fēng)險(xiǎn)。通過研究由繼電保護(hù)系統(tǒng)隱藏故障導(dǎo)致的電網(wǎng)N-k故障風(fēng)險(xiǎn)來評(píng)估隱藏故障的風(fēng)險(xiǎn)水平。提出一種基于事件樹分析法和功能組分解法的電網(wǎng)N-k故障概率求取方法，以及一種綜合電源功率損失、負(fù)荷功率損失和輸電斷面功率損失的故障后果評(píng)價(jià)指標(biāo)。實(shí)際電網(wǎng)算例分析表明：該方法有助于提高N-k故障概率的計(jì)算準(zhǔn)確度，辨識(shí)出系統(tǒng)中的關(guān)鍵線路，發(fā)現(xiàn)電網(wǎng)的薄弱環(huán)節(jié)，防治連鎖故障的發(fā)生。
[Abstract]:With the increasing complexity of power network structure and operation uncertainty, the operational reliability of power system is facing more and more serious challenges. The hidden fault of relay protection system is one of the main factors that affect the operation reliability of power system. Modeling and analysis of hidden fault of relay protection system is helpful to study the mechanism of hidden fault, identify the weak link of protection system, evaluate the risk of hidden fault of relay protection system and analyze the development process of cascading fault. Identify critical circuits and high risk fault paths in the system. The research on hidden fault of relay protection system can improve the reliability of power system, and it plays an important role in improving the level of power system safety and stability. Firstly, the mechanism of hidden fault in relay protection system is analyzed. The causes of hidden faults are studied from four aspects: the failure of internal components of relay protection device, the unreasonable setting of protection, the failure of protection principle and the fault of auxiliary component of protection system. It is found that the hidden fault of relay protection system has the characteristics of multi-mode. This paper summarizes the analysis methods used in the existing research to deal with hidden faults, and expounds the realization mechanism of these methods from the point of view of probability and risk. Then, the hidden fault of the relay protection system of EHV transmission line is studied. By analyzing the hidden faults of main line protection, backup protection, circuit breaker device and circuit breaker failure protection, a multi-mode hidden fault model is established. Based on this model, a method of N-k fault prediction analysis is proposed. The N-k fault path of power network is forecasted from three angles of fixed risk range distance III load reliability and circuit breaker fault. Numerical examples show that this method is helpful to analyze the fault mechanism of N-k fault, identify some important fault paths, and find the weak links of the protection system. Finally, the risk of hidden fault of relay protection system is evaluated. The risk level of hidden fault is evaluated by studying N-k fault risk caused by hidden fault of relay protection system. A fault probability estimation method based on event tree analysis and function group decomposition is proposed, and an evaluation index of fault consequence of power loss, load power loss and power loss of transmission section is presented. The practical examples show that this method is helpful to improve the accuracy of N-k fault probability, identify the key lines in the system, find the weak links of the power network, and prevent the occurrence of cascading faults.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM77

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