基于暂态电流Pearson相关性的两电平VSC-HVDC直流线路故障判别

发布时间：2019-03-21 14:45

【摘要】：为提高柔性直流(VSC-HVDC)输电系统的直流线路故障处理能力,提出了一种基于暂态电流相关性的直流线路故障判别方法。直流线路发生区内、外故障时,直流线路两端的电容支路暂态电流与直流线路入口处暂态电流特征差异明显;利用Pearson相关系数来描述电容支路与线路入口处暂态电流的差异程度,直流线路故障的判别仅通过线路两端计算的暂态电流Pearson相关系数即可实现。该故障判别方法可克服非故障线路馈入电流的影响,适用于两端以及多端柔性直流输电系统。分析和仿真结果表明,该故障判别方法不受高频分量、数据同步、故障位置与类型、噪声干扰以及控制方式等因素的影响,能准确地识别直流线路区内、外故障,实现故障线路的选择。
[Abstract]:In order to improve the capability of DC line fault processing in flexible DC (VSC-HVDC) transmission system, a fault diagnosis method based on transient current dependence is proposed. The characteristics of the capacitor branch transient current at both ends of DC line and the transient current at the entrance of DC line are obviously different when the internal and external faults occur in the DC line. Pearson correlation coefficient is used to describe the difference of transient current between capacitor branch and line entrance. The fault discrimination of DC line can only be achieved by calculating the Pearson correlation coefficient of transient current at two ends of the line. The fault detection method can overcome the influence of feed current on non-fault line and is suitable for both ends and multi-terminal flexible DC transmission systems. The analysis and simulation results show that the fault discrimination method is not affected by high frequency components, data synchronization, fault location and type, noise interference and control mode, and can accurately identify the internal and external faults of DC lines. The fault line selection is realized.
【作者单位】：电力传输与功率变换控制教育部重点实验室(上海交通大学电气工程系);
【基金】：国家自然科学基金项目资助(51377104,51407115)
【分类号】：TM721.1

【相似文献】