中文摘要：

针对目前直流输电线路行波保护耐受过渡电阻能力差的问题,在系统地分析±800 k V直流线路不同故障暂态特性的基础上,提出了一种利用电压比自适应调整保护定值的极线行波保护新原理及其定值整定原则。采用应用于±800 k V云广直流实际工程运维分析的PSCAD/EMTDC详细仿真模型对保护新原理进行验证,结果表明所提保护原理能有效地提高目前行波保护耐受过渡电阻能力和抗干扰能力,且可在现有行波保护软硬件平台上实现,工程实用性强。

英文摘要：

In order to solve the shortcomings of the ability of enduring fault resistance of traveling wave based protection for ±800 k V UHVDC transmission line, this paper analyzes the fault transient characteristics systematically then discover that the fault feature on the ratio of maximum voltage variation to maximum voltage change ratio is particularly helpful for DC line fault identification. Hence, this paper proposes a novel ±800 k V HVDC traveling wave based protection with adaptive settings and the rule of settings. The detailed PSCAD/EMTDC simulation model, which is widely used for analyzing ±800 k V Yun-Guang UHVDC project in the process of operation and maintenance, is applied to test the proposed protection. It is proved the protection can improve the ability of enduring transition resistance and the performance of anti-interference greatly, and can be implemented based on existing hardware and software platform.