矿井电网新型漏电保护研究
发布时间：2018-12-11 20:08
【摘要】：漏电不仅是低压矿井电网产生故障的主要形式之一,而且是影响工矿企业安全供电以及人身安全的重要因素。因此,在矿井电网特殊环境下准确可靠地判定漏电支路是亟待解决的问题。由于漏电机理较为复杂,影响因素较多,且漏电信号微弱,特征不明显,故矿井电网漏电保护一直是一个很难解决的课题。本论文基于对故障过程分析的基础上,探寻一种矿井电网漏电保护的新途径。针对矿井电网漏电特征机理不甚明确的问题,本论文搭建了附加直流源低压矿井电网漏电模型,对附加直流源低压矿井模型暂态特征进行了详细的分析,揭示了附加直流源系统故障暂态过程中的部分特征规律,分析给出了交流作用下各个支路的故障瞬时零序电流、直流作用下各个支路的故障瞬时零序电流、交直流共同作用下各个支路的故障瞬时零序电流等单相漏电特征数学动态表达式,从而使附加直流源矿井低压电网故障瞬时得到了定量的估计。理论分析以及大量的仿真分析得出结论,在故障初始阶段,故障支路与非故障支路零序电流中的直流分量差别较大,在复杂的暂态信号中提取直流分量,需研究快速可靠的合适方法。针对复杂的暂态零序电流,需要准确可靠地提取其中的直流分量,本论文提出了利用最小二乘矩阵束算法来满足课题的要求。同时对选漏方法进行了构建,利用最小二乘矩阵束算法准确地得到各个支路在故障初始状态下零序电流中的直流分量,根据得到的直流分量来得到各个支路的绝缘电阻值,进而根据绝缘电阻值的大小来判定故障支路。从而达到了故障选漏的快速、准确可靠性以及普适性。为了验证本论文提出故障选漏方法的可靠性,因此,本论文利用Matlab软件搭建附加直流源低压矿井仿真模型验证,本论文不仅仿真验证而且进行了试验验证,搭建模拟的附加直流源低压矿井实验平台,结果表明,该选漏方法快速、准确可靠以及普适性。
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD611.5
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD611.5
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