750kV空载线路电弧重燃下分闸过电压仿真分析

发布时间：2018-01-08 22:23

本文关键词：750kV空载线路电弧重燃下分闸过电压仿真分析　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在人类社会快速向前发展的同时,电网的建设经过长时间的发展,已经取得了举世瞩目的成就。到了二十一世纪,中国的电网技术已经位于世界前列了。当前我国已经将大力发展更加智能的现代化电网作为主要的事业。随着高电压等级电网的建设,电力系统暂态过电压的类型也变得更多,对其过电压的研究就显得更加重要。在电力网中,操作过电压中的空载线路分闸过电压对电气设备的绝缘和保护都有很大的影响,多次造成绝缘子的闪络和击穿,其主要是由于其幅值高、波形陡和持续时间短的特点造成的。而造成分闸操作过电压的最根本的原因是断路器的重燃。所以,对其空载线路分闸过电压在电弧重燃的情况下进行相关的研究和分析是很有实际意义的。本文就是基于750kV的空载线路,利用图形预处理程序ATPdraw,通过组建四种不同的仿真模型,为750kV空载线路分闸过电压仿真模型和在同一种情况下的750kV空载线路并联电抗器分闸过电压仿真模型;然后是在电弧重燃下建立的仿真模型,分别为750kV空载线路电弧重燃下分闸过电压仿真模型和在同一种情况下的750kV空载线路电弧重燃下并联电抗器分闸过电压的仿真模型。具体研究方法是先对在电弧不重燃时的仿真模型进行仿真研究,得到在电弧不发生重燃时分闸过电压的情况,然后设定不同的电抗器数值,研究并联不同数值的电抗器对此种情况下分闸过电压的抑制效果;然后对电弧重燃时的仿真模型进行仿真研究,在其他条件不变的情况下,设置不同的电弧重燃次数,仿真研究不同弧重燃次数下的空载分闸过电压,得到在所取范围内影响最恶劣时的电弧重燃次数;然后设定电弧重燃次数为最恶劣的情形,在此种情况下再并联不同的电抗器数值,仿真研究不同电抗器数值对此种情况下空载分闸过电压的影响。最后对所得到的数据进行比较,分析讨论电弧重燃对空载线路分闸过电压的具体影响以及并联电抗器对电弧重燃的具体抑制效果。
[Abstract]:With the rapid development of human society, the construction of the power grid has made remarkable achievements after a long period of development. In 21th century. China's power grid technology has been in the forefront of the world. At present, China has vigorously developed a more intelligent modern power grid as the main cause. With the construction of high-voltage power grid. There are more types of transient overvoltages in power systems, so it is more important to study them. The switching overvoltage of no-load line in operating overvoltage has a great influence on the insulation and protection of electrical equipment, which causes the flashover and breakdown of insulator many times, mainly because of its high amplitude. The characteristics of steep waveform and short duration. And the most fundamental cause of switching overvoltage is the reburning of circuit breakers. It is of great practical significance to study and analyze the switching overvoltage of its no-load line in the case of arc reburning. This paper is based on 750kV no-load line. Four different simulation models are constructed by using drawing preprocessing program, which is a drawing preprocessing program. The simulation model of switching overvoltage for 750 kV no-load transmission line and the simulation model for switching overvoltage of parallel reactor of 750 kV no-load line under the same condition; Then the simulation model is established under arc reburning. The simulation models of switching overvoltage for 750kV no-load lines under arc reburning and for parallel reactors under reburning of 750kV no-load lines under the same condition are presented respectively. The method is to simulate the simulation model when the arc is not reburning. When the arc does not reburn, the switching overvoltage is obtained, and then different reactor values are set to study the suppression effect of the shunt reactor on the switching overvoltage in this case. Then the simulation model of arc reburning is simulated. Under other conditions, different arc reburning times are set, and the no-load switching overvoltage under different arc reburning times is simulated. The number of arc reburning in the worst range is obtained. The number of arc reburning is then set to be the worst case in which different reactor values are paralleled. The effects of different reactor values on the no-load switching overvoltage in this case are studied by simulation. Finally, the obtained data are compared. The influence of arc reburning on the switching overvoltage of no-load lines and the effect of parallel reactor on arc reburning are analyzed and discussed.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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