【作者】 宁广忠；

【导师】 朱东柏； 李兴斌；

【作者基本信息】 哈尔滨理工大学 ， 电气工程， 2003， 硕士

【摘要】 随着我国经济的发展和人民生活水平的提高，我国的电力系统迅速的增容。正在进行中的城网、农网改造将把我国的电网供电能力提高到一个新的水平。随之而来的是电网对地电容的增大，特别是城网改造中电力电缆的广泛应用，使电网的对地电容成倍增加，切除某一支路对整个电网的对地电容影响比较大。现有的消弧线圈装置由于调感方式落后，调节范围小，响应速度慢等原因，已经不能满足目前配电网对消弧装置的要求。所以近年来，各种新型的自动跟踪补偿的消弧线圈装置应运而生。 本文提出一种采用IGBT控制实现的新型无级调感技术，该技术不仅可以迅速调感，还可以根据需要产生谐波电流用于对地电容的检测。应用该技术设计制造的自动跟踪补偿的消弧线圈装置技术含量高，有电路结构简单，调感范围大，响应速度快，运行噪音低，振动小等优点，完全可以满足电网的要求。 论文中首先介绍了中性点接地方式的发展过程，通过对谐振接地原理和单相接地故障的暂态、稳态分析，认识到接地故障对系统安全运行的危害，通过消弧线圈对接地电容电流的迅速准确补偿是减小故障危害的最主要手段。然后文章详细论述了采用IGBT控制实现的无级调感技术的原理，并给出了仿真模拟和实际电路试验的结果。从试验结果可以看出，该技术是正确可行的。最后本文根据该技术设计了自动跟踪消弧线圈装置的电路和对地电容检测方法，给出了各部分的电路图和控制程序流程图。更多还原

【Abstract】 Following the improvement of our economy and living standard, the capacitance of power system is increased rapidly. The alteration of city and country power system will bring the power supply ability to a new level. Especially, the widely use of power cable cause the capacitance to earth doubled, and a cutoff of some lateral line has comparatively larger effect. So, many arc eliminating coils have not been satisfied with the requirment of modern power system, because of their outdated tuning method, small tuning scope and slow tuning speed. In the recent years, many capacitive current automatic tracing compensations have emerged as the times require.In this paper, a new technique of stepless inductance change controled by IGBTs is proposed, which can not only change inductance quickly and smoothly, but also generate harmonic current to detect the capacitance to earth as required. New designed auto tracing arc eliminating device based on this technique contents more technology, which has sample circuit, wide tuning scope, quick response and low noise.This paper firstly introduces neutral grounding histroy. By analyzing the syntony grounding theory, the transient and stable process of one-phase grounding fault, the threaten to secure run of power system and the importance of exact compensation for capacitive current are cognized. Following this, the theory of new stepless inductance change technique is discussed in detail. The given data of both simulated and true circuit test show that this new method is exact and feasible. Finally, the circuit of new arc eliminating device, the capacity detect method and the flow chart of its control program are proposed.更多还原