【作者】 孙伟红；

【导师】 李国庆； 王振浩；

【作者基本信息】 东北电力大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 本文首先针对中性点不接地电网正常运行和发生单相接地故障时的主要特点进行了理论分析,由此进一步介绍了经消弧线圈接地电网的运行特点以及单相接地时消弧线圈的补偿原理。其次,详细列举了当前相对比较成熟的电网对地电容电流的检测方法,并对这些检测方法的原理、精确度和可行性进行了分析。在以上研究工作的基础上,本课题研究设计了以单片机为核心具有自动跟踪补偿功能的调容式消弧装置。该装置由扫频信号装置、控制器和调容控制柜组成。它的本体电抗器部分在电感的铁芯上增加一个二次绕组,二次侧绕组上并联有不同容量的电容器组。采用“注入变频信号”的算法来跟踪计算电容电流,计算简单、精度高,而且特别适合调容式消弧线圈自动补偿系统;采用“随调式”的调节方法给,可省去有载多档开关和相对薄弱的阻尼电阻箱,简化了一次设备,降低成本且故障率低。最后,利用PSCAD/EMTDC软件对中性点经消弧线圈接地系统的各种状态进行仿真,对本文的设计进行了验证,证明了其可行性与可靠性。更多还原

【Abstract】 Firstly,this article aiming at the conditon and characteristic of Non-grouding network has carried on the therical analysis. From this it draws out normal operation status in arc suppression coil grouding neutral system ,as well as compensation principle of arc suppression coil when single-phase earth.Secondly,this paper has in detail enumerated the relative mature capacitance curreent examination method of network ,has carried on the principle analysis of the equation development to these examination methods,and has carried on the analysis to their precise degree and the feasibility.In above fundamental research, this topic successfully developed the auto arc suppression coil with switched capacitors which takes the single-chip as the core.This equipment is composed by signal generator、the controller and the combination control tank. The reactor increases two windings on the inductance core. On secondary windings has the different capacity of capacitors. The method using the“injecting variable frequency“to complete capacitive current is simple to compute, high precision moreover is suitable to arc suppression coil with switched capacitors; Using "following adjustment" can omit the on一load switch and the damping resistance box to simplify the equipment, reduce the cost and reduce the failure rate.Then author uses PSCAD/EMTDC to simulate all kinds of the conditions of the electric power system with neutral grounding through the arc suppression coil. The practicality experiment was done to validate the reliability of our set to quench grounding current. All of the results of these simulations demonstrate the function of this set.更多还原