基于数学形态学的高压直流输电线路无通道保护研究

高压直流输电线路的行波保护，分有通道保护和无通道保护2种方式。现有输电线路行波故障测距的共同缺点是：无论单端法还是双端法都会由于故障发生时行波波速的不确定，给故障定位造成误差。新型的基于单端行波故障澳4距的无通道保护方案，利用数学形态学检测故障波形，准确确定暂态初始行波、故障点反射波、对端母线反射波到达保护装置端的时间，能实现故障准确判别和故障定位。

A Non-communication Protection of HVDC Transmission Lines Based on Mathematical Morphology

The dissertation introduces the main protection of HVDC transmission line-Traveling Wave Protection, which consists of communication and non-communication protection. In view of either single-terminal method or dual-terminal method has error, which is caused by the uncertainty of wave speed. An accurate fault locating method based on single terminal traveling waves is presented, using the merits of mathematical morphology to detect fault waveforms. To make sure the accurate arriving times of the ini- tial traveling waves, echo from fault point and echo from opposite bus. Then makes the basement of the quick fault judgment and precise fault location.