基于单相电流行波的配电线路单相接地故障选线方法

发布时间：2018-11-11 13:21

【摘要】：为解决现有单相电流行波选线方法有效时间窗短、存在死区,且受到现场电流互感器(current transformer,CT)配置方式的制约等问题,提出一种利用故障暂态单相电流和母线三相电压构造方向行波并进行故障方向识别的配电线路接地选线新方法。该方法选取一定数据窗内各线路单相电流和母线三相电压,利用单相电流与模量电压的线性组合,构造模量上的特征方向行波(characteristic directional traveling wave,CDTW)。通过二进小波变换求取CDTW在特定频带内的分解系数,进而计算出特征正、反向行波积分关系实现接地选线。数学证明与仿真结果表明,所提方法选线可靠性高,在故障全过程均有效,特征方向行波定义合理,且不受中性点接地方式等因素的影响。
[Abstract]:In order to solve the problems such as short effective time window, dead zone, and restricted by the configuration mode of field current transformer (current transformer,CT), the existing single-phase current traveling-wave line selection method can solve the problems, such as the short effective time window, the existence of dead zone, etc. A new method of earthing line selection for distribution line is proposed, which uses transient single-phase current and three-phase voltage of busbar to construct directional traveling wave and identify fault direction. In this method, single-phase current and busbar three-phase voltage are selected in a certain data window, and the characteristic directional traveling wave (characteristic directional traveling wave,CDTW) is constructed by using the linear combination of single-phase current and modulus voltage. The decomposition coefficients of CDTW in a specific frequency band are obtained by binary wavelet transform, and then the characteristic forward and reverse traveling-wave integral relations are calculated to realize grounding line selection. The mathematical proof and simulation results show that the proposed method is highly reliable, effective in the whole process of fault, reasonable definition of characteristic directional traveling wave, and not affected by neutral grounding mode.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);
【基金】：国家自然科学基金重点基金项目(50937003);国家自然科学基金重大国际合作项目(51120175001);国家自然科学基金青年基金项目(51107062,51007045)~~
【分类号】：TM862

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