超高压输电线路潜供电弧特性分析与对策研究

发布时间：2018-05-10 19:46

本文选题：单行自动重合闸 + 潜供电流　；参考：《广西大学》2014年硕士论文

【摘要】：我国超高压同塔双回输电线路在系统发生单相接地瞬时性故障时,通常采用单向自动重合闸的操作方式,来保证电力系统的稳定性和可靠性。故障点的潜供电弧能否及时熄灭很大程度上决定了单相重合闸的成功与否。潜供电弧的两个重要参数是潜供电流和恢复电压,有必要对其特性进行研究,并采取合理有效的抑制措施,以提高重合闸的成功率。本文首先采用了集中参数法和分布参数法对潜供电流和恢复电压进行理论推导与分析,得出其主要由容性分量和感性分量构成,由得到的数学表达式可知潜供电流的容性分量与线路长度呈正比关系,亦随着线路的相间电容的增大而增大,潜供电流的感性分量与线路故障的发生点密切相关,并呈一定的规律性,在线路两端数值相等方向相反。恢复电压的容性分量仅仅与线路的电压和电容有关,线路的长度和故障发生点对其没有影响,感性分量与线路参数和故障点都密切相关。讨论了输电线路参数对潜供电弧的影响,并应用ATP电磁暂态仿真软件对单回输电线路和双回输电线路研究了大地电阻率、故障相、故障点、线路长度等因素对潜供电流和恢复电压的影响。分别介绍了并联电抗器中性点加装小电抗和加装快速接地开关(HSGS)对潜供电弧的抑制原理,并应用ATP仿真软件对一条同塔双回输电线路进行模拟仿真分析,提出了利于快速灭弧的中性点小电抗的取值范围和快速接地开关的最优配置。结果表明,两项抑制措施均能快速有效的将潜供电流迅速限制在10A以下,加快了灭弧速度,大大提高了单相自动重合闸的成功率
[Abstract]:In order to ensure the stability and reliability of the power system, the single-phase grounding transient fault is usually adopted in the UHV double-circuit transmission line with the same tower in our country, and the operation mode of one-way automatic reclosing is usually adopted to ensure the stability and reliability of the power system. The success of single-phase reclosing is largely determined by whether the submersible arc of fault point can be extinguished in time. The two important parameters of the submersible arc are the submersible current and the recovery voltage. It is necessary to study its characteristics and take reasonable and effective suppression measures to improve the success rate of reclosing. In this paper, the concentrated parameter method and the distributed parameter method are used to derive and analyze the potential supply current and the recovery voltage, and it is found that the submersible current and the recovery voltage are mainly composed of capacitive and inductive components. The obtained mathematical expression shows that the capacitive component of the potential current is proportional to the length of the line and increases with the increase of the interphase capacitance of the line. The inductive component of the potential current is closely related to the occurrence point of the line fault. And there is a certain regularity, the opposite direction is equal at both ends of the line. The capacitive component of the recovery voltage is only related to the voltage and capacitance of the line, the length of the line and the fault occurrence point have no effect on it, and the inductive component is closely related to the line parameters and fault points. The influence of transmission line parameters on submersible arc is discussed, and the earth resistivity, fault phase and fault point of single circuit transmission line and double circuit transmission line are studied by ATP electromagnetic transient simulation software. The influence of line length and other factors on the submersible current and recovery voltage. This paper introduces the principle of suppression of submersible arc by adding small reactance to neutral point of parallel reactor and fast grounding switch (HSGSs), and simulates and analyzes a double-circuit transmission line with the same tower by using ATP simulation software. The range of small reactance of neutral point and the optimal configuration of fast grounding switch are proposed. The results show that both of the two suppression measures can quickly and effectively limit the potential supply current to less than 10A, accelerate the arc extinguishing speed, and greatly improve the success rate of single-phase automatic reclosing.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75

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