【摘要】：漏電不僅是低壓礦井電網(wǎng)產(chǎn)生故障的主要形式之一,而且是影響工礦企業(yè)安全供電以及人身安全的重要因素。因此,在礦井電網(wǎng)特殊環(huán)境下準(zhǔn)確可靠地判定漏電支路是亟待解決的問(wèn)題。由于漏電機(jī)理較為復(fù)雜,影響因素較多,且漏電信號(hào)微弱,特征不明顯,故礦井電網(wǎng)漏電保護(hù)一直是一個(gè)很難解決的課題。本論文基于對(duì)故障過(guò)程分析的基礎(chǔ)上,探尋一種礦井電網(wǎng)漏電保護(hù)的新途徑。針對(duì)礦井電網(wǎng)漏電特征機(jī)理不甚明確的問(wèn)題,本論文搭建了附加直流源低壓礦井電網(wǎng)漏電模型,對(duì)附加直流源低壓礦井模型暫態(tài)特征進(jìn)行了詳細(xì)的分析,揭示了附加直流源系統(tǒng)故障暫態(tài)過(guò)程中的部分特征規(guī)律,分析給出了交流作用下各個(gè)支路的故障瞬時(shí)零序電流、直流作用下各個(gè)支路的故障瞬時(shí)零序電流、交直流共同作用下各個(gè)支路的故障瞬時(shí)零序電流等單相漏電特征數(shù)學(xué)動(dòng)態(tài)表達(dá)式,從而使附加直流源礦井低壓電網(wǎng)故障瞬時(shí)得到了定量的估計(jì)。理論分析以及大量的仿真分析得出結(jié)論,在故障初始階段,故障支路與非故障支路零序電流中的直流分量差別較大,在復(fù)雜的暫態(tài)信號(hào)中提取直流分量,需研究快速可靠的合適方法。針對(duì)復(fù)雜的暫態(tài)零序電流,需要準(zhǔn)確可靠地提取其中的直流分量,本論文提出了利用最小二乘矩陣束算法來(lái)滿足課題的要求。同時(shí)對(duì)選漏方法進(jìn)行了構(gòu)建,利用最小二乘矩陣束算法準(zhǔn)確地得到各個(gè)支路在故障初始狀態(tài)下零序電流中的直流分量,根據(jù)得到的直流分量來(lái)得到各個(gè)支路的絕緣電阻值,進(jìn)而根據(jù)絕緣電阻值的大小來(lái)判定故障支路。從而達(dá)到了故障選漏的快速、準(zhǔn)確可靠性以及普適性。為了驗(yàn)證本論文提出故障選漏方法的可靠性,因此,本論文利用Matlab軟件搭建附加直流源低壓礦井仿真模型驗(yàn)證,本論文不僅仿真驗(yàn)證而且進(jìn)行了試驗(yàn)驗(yàn)證,搭建模擬的附加直流源低壓礦井實(shí)驗(yàn)平臺(tái),結(jié)果表明,該選漏方法快速、準(zhǔn)確可靠以及普適性。
[Abstract]:Leakage is not only one of the main forms of failure in low-voltage mine power network, but also an important factor affecting the safety of power supply and personal safety in industrial and mining enterprises. Therefore, it is an urgent problem to determine leakage branch accurately and reliably under the special environment of mine power network. Because the leakage mechanism is more complex, the influence factors are many, and the leakage signal is weak and the characteristics are not obvious, the leakage protection of mine power network is always a difficult problem to solve. Based on the analysis of fault process, this paper explores a new way of leakage protection in mine power network. In order to solve the problem that the mechanism of leakage characteristics of mine power network is not clear, a leakage model of low voltage mine network with additional DC source is built in this paper, and the transient characteristics of low voltage mine model with additional DC source are analyzed in detail. In this paper, some characteristic laws of fault transient process of additional DC source system are revealed. The instantaneous zero sequence current of each branch under AC action and the instantaneous zero sequence current of each branch under DC action are analyzed. The mathematical dynamic expression of fault instantaneous zero sequence current and other single-phase leakage characteristics of each branch under the joint action of AC and DC makes the instantaneous quantitative estimation of the fault of mine low voltage power network with additional DC source. Theoretical analysis and a large number of simulation analyses show that in the initial stage of the fault, the DC component in the zero-sequence current of the fault branch and the non-fault branch is quite different, and the DC component is extracted from the complex transient signal. It is necessary to study suitable and rapid and reliable methods. In view of the complex transient zero-sequence current, it is necessary to extract the DC component accurately and reliably. In this paper, the least square matrix beam algorithm is proposed to meet the requirements of the subject. At the same time, the leakage selection method is constructed, and the DC component of each branch in the initial state of fault is accurately obtained by using the least square matrix beam algorithm, and the insulation resistance of each branch is obtained according to the obtained DC component. Then the fault branch is determined according to the value of insulation resistance. Thus, the fault leak selection is fast, accurate, reliable and universal. In order to verify the reliability of the fault leak selection method proposed in this paper, this paper uses Matlab software to build an additional DC source low-voltage mine simulation model verification, this paper not only simulation validation but also experimental verification. The experimental platform of low pressure mine with additional DC source is built, and the results show that the method is fast, accurate and reliable.
【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】：2016
【分類號(hào)】：TD611.5

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本文編號(hào)：2373147