基于行波的电力线路绝缘故障预警系统研究
发布时间：2018-10-20 14:33
【摘要】：电力线路故障大部分是由绝缘不良引起的,当前国内外缺乏成熟的线路绝缘薄弱点精确定位技术,论文为了解决电力线路绝缘水平监测的技术难题,试图通过检测线路局部放电产生的行波信号对线路健康状况进行监视,利用双端行波定位原理实现线路绝缘薄弱点精确定位,实现绝缘故障预警,防患于未然,切实提高供电可靠性。论文首先在研究线路绝缘故障发生机理的基础上,分析了线路绝缘故障产生的行波信号特征。根据绝缘闪络往往发生在电压峰值附近、过渡电阻较大、行波信号微弱的特点,提出了一种专门针对电力线路绝缘故障的行波检测方法。然后通过该行波信号幅值、行波信号间歇性特点,将模糊逻辑控制理论运用到电力线路绝缘故障预警中,提出了电力线路绝缘故障模糊预警方法,以绝缘故障产生的行波的幅值以及行波出现的时间间隔这两个特征量为模糊预警算法的输入,以这两个特征量与绝缘故障程度的关系建立模糊规则库,从而实现模糊预警。最后,论文实现了电力线路绝缘故障预警系统,并进行高压实验测试,测试了预警系统对不同电压等级绝缘故障的灵敏性,验证了该预警系统能广泛适用于各个电压等级的电网的绝缘故障预警。论文研究的电力线路绝缘故障预警系统,能监测绝缘故障发展的过程,对于强化安全基础管理,严格隐患治理,提高技防水平,降低事故发生的概率,提高电力系统安全稳定运行水平等具有非常重要理论与实践意义。
[Abstract]:The fault of power line is mostly caused by poor insulation. At present, there is a lack of mature precise location technology of insulation weakness at home and abroad. In order to solve the technical problem of monitoring insulation level of power line, This paper attempts to monitor the line health by detecting the traveling-wave signal generated by partial discharge of the line, realizes the accurate location of the insulation weakness of the line by using the principle of dual-terminal traveling wave localization, realizes the insulation fault warning, and prevents the trouble in the early stage. Improve the reliability of power supply. Firstly, on the basis of studying the mechanism of line insulation fault, the characteristics of traveling wave signal generated by line insulation fault are analyzed. According to the characteristics that the insulation flashover often occurs near the peak voltage, the transition resistance is large and the traveling wave signal is weak, a traveling wave detection method is proposed to detect the insulation fault of power line. Then the fuzzy logic control theory is applied to the power line insulation fault warning through the amplitude of the line wave signal and the intermittent characteristic of the traveling wave signal, and the fuzzy early warning method of the power line insulation fault is put forward. The amplitude of traveling wave produced by insulation fault and the time interval of traveling wave are taken as the input of fuzzy early warning algorithm. The fuzzy rule base is established based on the relationship between these two characteristic quantities and the degree of insulation fault, so as to realize fuzzy early warning. Finally, the paper realizes the power line insulation fault warning system, and carries on the high voltage experiment test, tests the early warning system to the different voltage grade insulation fault sensitivity. It is verified that this early warning system can be widely used in the insulation fault warning of various voltage levels of power systems. The power line insulation fault warning system studied in this paper can monitor the process of insulation fault development. It can strengthen the basic management of safety, strictly deal with hidden dangers, improve the level of technical prevention and reduce the probability of accidents. It is of great theoretical and practical significance to improve the safe and stable operation level of power system.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75
本文编号：2283451
[Abstract]:The fault of power line is mostly caused by poor insulation. At present, there is a lack of mature precise location technology of insulation weakness at home and abroad. In order to solve the technical problem of monitoring insulation level of power line, This paper attempts to monitor the line health by detecting the traveling-wave signal generated by partial discharge of the line, realizes the accurate location of the insulation weakness of the line by using the principle of dual-terminal traveling wave localization, realizes the insulation fault warning, and prevents the trouble in the early stage. Improve the reliability of power supply. Firstly, on the basis of studying the mechanism of line insulation fault, the characteristics of traveling wave signal generated by line insulation fault are analyzed. According to the characteristics that the insulation flashover often occurs near the peak voltage, the transition resistance is large and the traveling wave signal is weak, a traveling wave detection method is proposed to detect the insulation fault of power line. Then the fuzzy logic control theory is applied to the power line insulation fault warning through the amplitude of the line wave signal and the intermittent characteristic of the traveling wave signal, and the fuzzy early warning method of the power line insulation fault is put forward. The amplitude of traveling wave produced by insulation fault and the time interval of traveling wave are taken as the input of fuzzy early warning algorithm. The fuzzy rule base is established based on the relationship between these two characteristic quantities and the degree of insulation fault, so as to realize fuzzy early warning. Finally, the paper realizes the power line insulation fault warning system, and carries on the high voltage experiment test, tests the early warning system to the different voltage grade insulation fault sensitivity. It is verified that this early warning system can be widely used in the insulation fault warning of various voltage levels of power systems. The power line insulation fault warning system studied in this paper can monitor the process of insulation fault development. It can strengthen the basic management of safety, strictly deal with hidden dangers, improve the level of technical prevention and reduce the probability of accidents. It is of great theoretical and practical significance to improve the safe and stable operation level of power system.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75
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