数字式纵联电流差动保护算法同步策略探讨

数字式纵联电流差动保护的先决条件之一就是保证两侧的同步。在分析数字式纵联电流差动保护内部各环节出现的各种同步问题的基础上,比较研究了各种同步技术策略对保护算法实现的影响,从中可以看出各技术环节的同步策略既相互独立,又相互紧密联系。同时,在线路两侧的电流相量同步技术问题上,侧重同步两侧采样时钟的绝对同步策略和侧重针对通信时延影响的相对同步策略两者之间各有利弊,而且在某些情况下还可相互配合,相互补充使用。

Discussion on synchronization strategy for digital longitudinal current differential protection

One of prerequisites for the digital longitudinal current differential protection is to make sure the synchronization of both sides.Based on the analysis of different synchronization problems happened inside the digital longitudinal current differential protection,influences of various technical strategies for synchronization on protection algorithms are compared,from which synchronization strategies for different technical sections are independent and related to each other.As to the current vector synchronization of both line sides,with their own advantages and disadvantages,the absolute synchronization strategy,emphasizing on synchronization sampling clock,and the relative synchronization strategy,emphasizing on the influence of communication time delay,may cooperate in some cases.