利用暂态测量阻抗的高压直流线路故障识别方法

发布时间：2018-05-12 14:56

本文选题：高压直流 + 暂态测量阻抗　；参考：《中国电机工程学报》2016年20期

【摘要】：为提高高压直流线路故障检测的准确性,提出一种利用直流线路两端暂态测量阻抗特征的故障判别方法。基于长线路传输方程,分析直流区内、外故障暂态过程中线路两端的暂态测量阻抗特征(定义为暂态电压分量与暂态电流分量之比)。由于直流线路与边界在不同频带下呈现的阻抗特征存在差异,区内、外故障时,线路两端暂态测量阻抗将不同,据此可形成故障判据。利用暂态测量阻抗进行故障判别,克服传统暂态谐波保护中谐波幅值低、易受线路衰减及过渡电阻的影响等缺陷。结合双极线路低频段暂态分量耦合系数小的特点,提出利用低频段暂态电流比值进行故障极判别。仿真分析与现场录波数据测试表明,该方法能准确、可靠地实现直流线路的故障判别,具有较强的抗过渡电阻能力,且对于系统参数的变化具有一定的适应性。
[Abstract]:In order to improve the accuracy of fault detection of HVDC transmission line, a fault discrimination method using transient impedance characteristics of both ends of DC line is proposed. Based on the transmission equation of long transmission line, the impedance characteristics of transient measurement at both ends of the line during the transient process of external fault in DC region are analyzed (defined as the ratio of transient voltage component to transient current component). Because the impedance characteristics of DC line and boundary are different in different frequency bands, the transient measurement impedance at both ends of the line will be different when the fault occurs in the region or outside, so the fault criterion can be formed. In order to overcome the defects such as low harmonic amplitude easy to be affected by line attenuation and transient resistance in traditional transient harmonic protection the fault identification is carried out by using transient measurement impedance. Combined with the small coupling coefficient of transient components in the low frequency band of bipolar line, the fault pole discrimination is proposed by using the transient current ratio in the low frequency band. Simulation analysis and field wave recording data test show that the method can accurately and reliably distinguish the fault of DC line, has strong resistance to transition resistance, and has certain adaptability to the change of system parameters.
【作者单位】：上海交通大学电子信息与电气工程学院;国网福建省电力有限公司电力科学研究院;
【基金】：国家自然科学基金项目(51377104,51407115) 中国博士后科学基金(2014M560333)~~
【分类号】：TM755

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