電力電纜故障測(cè)距方法的研究
本文選題:FIMD + 小波變換; 參考:《東北農(nóng)業(yè)大學(xué)》2017年碩士論文
【摘要】:隨著我國(guó)經(jīng)濟(jì)的快速發(fā)展,城市現(xiàn)代化進(jìn)程的加快,電力電纜的應(yīng)用也變得越來(lái)越廣泛。然而,電力電纜在運(yùn)行的過(guò)程中,經(jīng)常會(huì)出現(xiàn)各種各樣的故障,破壞電力系統(tǒng)的正常運(yùn)行,甚至?xí)䲟p壞設(shè)備,若故障因長(zhǎng)時(shí)間存在而得不到解決,將會(huì)造成不必要的經(jīng)濟(jì)損失。為了滿足用戶的供電需求以及電力系統(tǒng)的安全穩(wěn)定運(yùn)行,快速準(zhǔn)確地檢測(cè)出電力電纜故障點(diǎn)位置,有利于及時(shí)消除故障,避免輸電線路中電纜的損壞。針對(duì)電力電纜故障定位誤差大問(wèn)題,本文結(jié)合電力電纜的故障類(lèi)型,提出一種基于FIMD和小波變換模極大值導(dǎo)數(shù)的雙端行波測(cè)距方法,實(shí)現(xiàn)電力電纜故障測(cè)距。本研究首先對(duì)電力電纜國(guó)內(nèi)外測(cè)距技術(shù)進(jìn)行了闡述,對(duì)電纜的故障類(lèi)型及造成故障的因素進(jìn)行了介紹。基于此基礎(chǔ),利用PSCAD仿真軟件對(duì)電力電纜建立模型,對(duì)各測(cè)量點(diǎn)的電流突變量進(jìn)行相模變換,用Matlab進(jìn)行數(shù)據(jù)優(yōu)化和處理;然后,對(duì)變換后的模分量基于FIMD和小波變換模極大值理論求導(dǎo)數(shù),查找出暫態(tài)電流信號(hào)的奇異點(diǎn),進(jìn)而得到故障兩端的時(shí)間;根據(jù)首個(gè)暫態(tài)行波的奇異點(diǎn)來(lái)確定初始行波到達(dá)線路兩端的時(shí)間,再利用改進(jìn)的雙端行波測(cè)距算法,計(jì)算出故障距離。同時(shí),本文對(duì)電力電纜在線監(jiān)測(cè)系統(tǒng)進(jìn)行了硬件和軟件的設(shè)計(jì),并對(duì)所設(shè)計(jì)的裝置進(jìn)行了設(shè)備選型,且進(jìn)行功能描述;再結(jié)合軟件技術(shù),對(duì)故障測(cè)距系統(tǒng)進(jìn)行軟件設(shè)計(jì),通過(guò)軟、硬件的有效結(jié)合,來(lái)實(shí)現(xiàn)對(duì)故障數(shù)據(jù)的采集和分析。最后,對(duì)本文所應(yīng)用的算法進(jìn)行驗(yàn)證分析,實(shí)際故障距離與所測(cè)得的數(shù)據(jù)進(jìn)行了對(duì)比分析,其誤差小于0.4%,完全滿足預(yù)期目標(biāo),有利于提高故障測(cè)距精度,也驗(yàn)證了該方法對(duì)于電力電纜的故障測(cè)距系統(tǒng)具有可行性,為電力電纜的故障測(cè)距提供了理論價(jià)值。
[Abstract]:With the rapid development of our economy and the acceleration of urban modernization, the application of power cable has become more and more extensive. However, in the process of power cable operation, there are often a variety of faults, which destroy the normal operation of the power system, and even damage the equipment. If the fault can not be solved for a long time, it will cause unnecessary economic losses. In order to meet the demand of power supply and the safe and stable operation of power system, the location of power cable fault point can be detected quickly and accurately, which is helpful to eliminate the fault in time and avoid the damage of cable in transmission line. Aiming at the problem of large fault location error of power cable, this paper presents a dual-terminal traveling wave location method based on FIMD and wavelet transform modulus maximum derivative to realize power cable fault location. In this paper, the location technology of power cable at home and abroad is introduced, and the fault types and the factors causing the fault are introduced. Based on this foundation, the power cable is modeled by PSCAD simulation software, and the current abrupt change of each measuring point is transformed into phase mode, and the data is optimized and processed by Matlab. Based on the modulus maximum theory of FIMD and wavelet transform, the singular point of transient current signal is found out, and the time at both ends of the fault is obtained. According to the singularity point of the first transient traveling wave, the time of initial traveling wave arriving at both ends of the line is determined, and the fault distance is calculated by using the improved two-terminal traveling wave location algorithm. At the same time, the paper designs the hardware and software of the power cable on-line monitoring system, and carries on the equipment selection and the function description to the designed device, and then combines the software technology, carries on the software design to the fault location system, Through the effective combination of software and hardware, the collection and analysis of fault data are realized. Finally, the algorithm used in this paper is verified and analyzed. The actual fault distance is compared with the measured data. The error is less than 0.4, which fully meets the expected goal and is conducive to improving the accuracy of fault location. The feasibility of this method for power cable fault location system is also verified, which provides theoretical value for power cable fault location.
【學(xué)位授予單位】:東北農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TM75
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