本文關(guān)鍵詞： 配電網(wǎng) 容性電流 信號注入法 IIR濾波器　出處：《西安科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著負(fù)荷密度區(qū)配電網(wǎng)規(guī)模的擴(kuò)大和電纜線路的大量應(yīng)用,配電網(wǎng)對地容性電流達(dá)到一個較高的水平。當(dāng)配電網(wǎng)發(fā)生單相接地故障時,故障點流過過大的容性電流,導(dǎo)致故障點易于產(chǎn)生電弧,進(jìn)而引起弧光過電壓,弧光過電壓會引起線路絕緣薄弱處損壞。在配電網(wǎng)中,當(dāng)容性電流超過規(guī)定值時,為了使故障接地點電弧迅速熄滅,避免事故的擴(kuò)大,需在配電網(wǎng)的中性點裝設(shè)消弧線圈。因此,為了減小配電網(wǎng)容性電流的危害,確定配電網(wǎng)的運(yùn)行方式,確定是否需要安裝消弧線圈及確定消弧線圈的容量,準(zhǔn)確的測量配電網(wǎng)的容性電流是十分必要的。深入研究現(xiàn)有的配電網(wǎng)對地容性電流測量方法,并對各種測量方法進(jìn)行了仿真,分析各種測量方法的測量精度、適用范圍和優(yōu)缺點。最終采用具有較多優(yōu)點的注入信號向量法,進(jìn)行進(jìn)一步深入研究。對向量法注入信號的選擇進(jìn)行深入研究,研究表明合理地選擇注入信號的強(qiáng)度和頻率可減小測量誤差,并最終確定選擇注入“一高一低”的頻率。其次,在仿真環(huán)境中搭建含有自噪聲、電弧爐和變頻器模型的不對稱系統(tǒng),仿真分析非線性負(fù)荷、系統(tǒng)不對稱等對注入信號向量法的影響。最后,對注入信號向量法的信號提取進(jìn)行研究,設(shè)計IIR濾波器,從含有噪聲、50Hz工頻干擾的信號中提取信號,仿真結(jié)果表明IIR濾波器能準(zhǔn)確提取信號,能使容性電流測量結(jié)果具有較高的精度。
[Abstract]:In recent years, with the expansion of distribution network size in load density area and a large number of applications of cable lines, the distribution network capacitive current to the ground reaches a higher level, when the single-phase grounding fault occurs in the distribution network. Fault points flow too large capacitive current, which leads to the fault point easily produce arc, and then cause arc over-voltage, arc over-voltage will lead to the line insulation weak damage, in the distribution network. When the capacitive current exceeds the specified value, arc suppression coils should be installed at the neutral point of the distribution network in order to extinguish the arc at the fault location quickly and avoid the expansion of the accident. Therefore, in order to reduce the harm of the capacitive current in the distribution network. Determine the operation mode of the distribution network, determine whether it is necessary to install the arc suppression coil and determine the capacity of the arc suppression coil. It is very necessary to measure the capacitive current of distribution network accurately. The existing methods of measuring capacitive current of distribution network to ground are deeply studied, and various measuring methods are simulated, and the measuring accuracy of various measuring methods is analyzed. Application range, advantages and disadvantages. Finally, the injection signal vector method with many advantages is used to further research. The selection of vector injection signal is studied deeply. The results show that selecting the intensity and frequency of the injection signal reasonably can reduce the measurement error, and finally determine the frequency of injection "one high and one low". Secondly, the self-noise is built in the simulation environment. The effects of nonlinear load and system asymmetry on the injection signal vector method are simulated and analyzed. Finally, the signal extraction of the injection signal vector method is studied. The IIR filter is designed to extract the signal from the signal with 50 Hz power frequency interference. The simulation results show that the IIR filter can extract the signal accurately and make the capacitive current measurement results have higher accuracy.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM933.1

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