發(fā)布時(shí)間：2018-10-30 08:46

【摘要】：單相接地故障通常伴隨電弧接地,電弧接地產(chǎn)生大量諧波,配電網(wǎng)非線性負(fù)載也會(huì)產(chǎn)生諧波,諧波直接導(dǎo)致故障零序電壓、電流畸變,現(xiàn)有的信號(hào)分析方法不能準(zhǔn)確的對(duì)故障畸變信號(hào)進(jìn)行分解,直接影響現(xiàn)有故障選線方法的準(zhǔn)確性。論文采用適用于畸變信號(hào)的數(shù)學(xué)分析方法計(jì)算分析含諧波的單相接地故障信號(hào),可有效提高故障選線的可靠性,對(duì)保證配電網(wǎng)的安全運(yùn)行具有重要意義。論文研究了在畸變電壓、電流作用下,利用Fryze非正弦分析方法分解畸變故障信號(hào)的優(yōu)勢(shì)。分別分析了中性點(diǎn)不接地運(yùn)行方式下和中性點(diǎn)經(jīng)消弧線圈接地運(yùn)行方式下,故障線路和非故障線路等效電導(dǎo)與零序諧波電壓頻率、零序諧波電流畸變率等的影響關(guān)系,推導(dǎo)出當(dāng)系統(tǒng)發(fā)生單相接地故障時(shí),故障線路零序等效電導(dǎo)大于非故障線路零序等效電導(dǎo)的結(jié)論的結(jié)論。在此基礎(chǔ)上,論文選用零序等效電導(dǎo)作為故障特征參數(shù)來辨識(shí)接地線路,在matlab仿真平臺(tái)上編寫并實(shí)現(xiàn)了單相接地故障選線算法。采用Fryze電流分解方法計(jì)算單相接地故障的零序等效電導(dǎo)時(shí)能夠?qū)⒅C波因素考慮在內(nèi),該方法不受中性點(diǎn)運(yùn)行方式的影響,尤其適合于對(duì)單相弧光接地故障的辨識(shí)。論文通過改變配電網(wǎng)不同的中性點(diǎn)接地方式、不同的線路參數(shù)、不同的諧波環(huán)境等條件,利用論文的選線方法對(duì)單相接地故障進(jìn)行仿真分析,結(jié)果表明該選線方法均能準(zhǔn)確選出故障線路,驗(yàn)證了論文選線方法的可靠性。
[Abstract]:Single phase grounding fault is usually accompanied by arc grounding, arc grounding produces a large number of harmonics, distribution network nonlinear load will also produce harmonic, harmonic directly lead to fault zero sequence voltage, current distortion, The existing signal analysis method can not decompose the fault distortion signal accurately, which directly affects the accuracy of the existing fault line selection method. In this paper, the mathematical analysis method suitable for distortion signal is used to calculate and analyze the single-phase grounding fault signal with harmonics, which can effectively improve the reliability of fault line selection, and is of great significance to ensure the safe operation of distribution network. In this paper, the advantage of decomposing the distorted fault signal by Fryze non-sinusoidal analysis method under the action of distorted voltage and current is studied. The relationship between the equivalent conductance of fault line and non-fault line and the frequency of zero-sequence harmonic voltage, the distortion rate of zero-sequence harmonic current and so on are analyzed respectively under neutral ungrounded operation mode and neutral point grounding mode through arc-suppression coil. The conclusion that the zero sequence equivalent conductance of the fault line is greater than the zero sequence equivalent conductance of the non fault line is deduced when the single phase grounding fault occurs in the system. On this basis, zero sequence equivalent conductance is selected as the fault characteristic parameter to identify the earth wiring, and the algorithm of single-phase grounding fault line selection is compiled and implemented on the matlab simulation platform. The harmonic factor can be taken into account when Fryze current decomposition method is used to calculate the zero-sequence equivalent conductance of single-phase grounding fault. This method is not affected by the operation mode of neutral point and is especially suitable for identification of single-phase arc grounding fault. By changing different neutral grounding modes, different line parameters, different harmonic environment and other conditions of distribution network, the paper uses the method of line selection to simulate and analyze single-phase grounding fault. The results show that the fault lines can be selected accurately by this method, and the reliability of the method is verified.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM862

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本文編號(hào)：2299523