中文摘要：

结合直流线路行波保护原理及各判据的实现方法,利用云广±800 k V直流输电系统的PSCAD/EMTDC仿真模型,从采样数据不确定性、区内外故障区分度、暂态干扰等方面分析了不同采样频率对直流线路行波保护各种判据的影响,结果表明采样频率的变化主要会对直流线路行波保护中的电压变化率判据产生较大影响。最后从整体性能角度给出了直流线路行波保护采样频率选取的建议。

英文摘要：

Combined with the principle of DC line traveling wave protection and the implementation methods of various criteria,the PSCAD / EMTDC simulation model of Yunnan-Guangdong ±800 k V DC transmission system is used to analyze the influence of sampling frequency on the criteria of DC line traveling wave protection from the aspects of sampling data uncertainty,discrimination between internal and external faults,transient interference,etc. The analytical results show that,the change of sampling frequency mainly affects the criterion of voltage change rate. Some suggestions about the selection of sampling frequency are given from the aspect of overall performance of DC line traveling wave protection.