The research and development of ultra high speed protective relay of transmission line has got great interest and attention of protective relay engineer over the world. Several versions and schemes of ultra high speed...The research and development of ultra high speed protective relay of transmission line has got great interest and attention of protective relay engineer over the world. Several versions and schemes of ultra high speed relay have been studied and designed in recent twenty years. But only a few of them have got actual apiication in the power system. The relay based on the deviation of power frequency component (DPFC) can get very high reliability with ultra high speed so it has got wide application in Chinese power system. Thousands relay sets have been applied and its operation experience verifies their excellent performance. This paper summarizes the course of the development of the uItra high speed protective relay and compares the merits and defects of the main schemes which have been developed. The principle and successful pratice of the ultra high speed protection based on DPFC reIay are introduced.展开更多
川藏交流联网工程中,架设于恶劣地质条件和气候环境中的长距离链式交流互联通道,故障开断风险较大。由于受电功率大且转动惯量水平小,互联通道开断形成的不平衡功率冲击,将对西藏昌都孤网频率稳定性构成严重威胁。分析了金河水电厂电力...川藏交流联网工程中,架设于恶劣地质条件和气候环境中的长距离链式交流互联通道,故障开断风险较大。由于受电功率大且转动惯量水平小,互联通道开断形成的不平衡功率冲击,将对西藏昌都孤网频率稳定性构成严重威胁。分析了金河水电厂电力系统稳定器(power system stabilizer,PSS)选型,对孤岛电网频率稳定的影响;揭示原SG型PSS不利于频率稳定的机制;以及SI型PSS跟踪转速偏差、动态柔性调控励磁电压,使可快速调节的发电机电磁功率跟随慢速变化的机械功率,进而改善孤岛电网频率稳定的机理。在此基础上,提出提升孤岛电网频率稳定对安控切负荷容量适应性的优化措施。研究结论为联网工程实施后,昌都孤岛电网安全稳定提供了保障。展开更多
文摘The research and development of ultra high speed protective relay of transmission line has got great interest and attention of protective relay engineer over the world. Several versions and schemes of ultra high speed relay have been studied and designed in recent twenty years. But only a few of them have got actual apiication in the power system. The relay based on the deviation of power frequency component (DPFC) can get very high reliability with ultra high speed so it has got wide application in Chinese power system. Thousands relay sets have been applied and its operation experience verifies their excellent performance. This paper summarizes the course of the development of the uItra high speed protective relay and compares the merits and defects of the main schemes which have been developed. The principle and successful pratice of the ultra high speed protection based on DPFC reIay are introduced.
文摘川藏交流联网工程中,架设于恶劣地质条件和气候环境中的长距离链式交流互联通道,故障开断风险较大。由于受电功率大且转动惯量水平小,互联通道开断形成的不平衡功率冲击,将对西藏昌都孤网频率稳定性构成严重威胁。分析了金河水电厂电力系统稳定器(power system stabilizer,PSS)选型,对孤岛电网频率稳定的影响;揭示原SG型PSS不利于频率稳定的机制;以及SI型PSS跟踪转速偏差、动态柔性调控励磁电压,使可快速调节的发电机电磁功率跟随慢速变化的机械功率,进而改善孤岛电网频率稳定的机理。在此基础上,提出提升孤岛电网频率稳定对安控切负荷容量适应性的优化措施。研究结论为联网工程实施后,昌都孤岛电网安全稳定提供了保障。
