中文摘要：

采用理论推导与仿真分析相结合的方法对高压直流线路区内和区外故障的电压以及电压变化率的暂态特性进行了研究,发现区内外故障的电压变化率最大值出现时刻存在明显差异。利用该特性区分高压直流线路区内外故障。基于PSCAD/EMTDC的仿真测试结果表明,所提方法能可靠识别直流线路区内外故障,且耐受较高的过渡电阻,所需采样频率较低、时间窗短,可基于现有软硬件平台实现。

英文摘要：

A method combining theoretical derivation and simulative analysis is applied to study the transient characteristics of voltage and its variation rate during the in-zone and out-zone faults of HVDC transmission line. Results show that the maximum voltage variation rate occurrence time of in-zone fault is obviously different from that of out-zone fault,which is then used to distinguish them from each other. The simulative results of PSCAD / EMTDC show that,the proposed method can reliably identify the in-zone and out-zone faults;immune to high transition resistance,it needs low sampling frequency and short time window;and it can be implemented based on the existing hardware and software platforms.