双重故障模式下基于证据理论和功能组分解的N-k事故辨识方法

N-k Contingency Identification Method Under Double Failure Incident Based on Evidence Theory and Functional Group Decomposition

根据不同阶段的特点,连锁故障可以分解为源发性故障阶段和相继故障阶段。该文分析了不同类型的保护装置隐性故障在源发性故障阶段的故障后果,指出断路器失灵故障在连锁故障研究中的重要性,提出一种由源发性故障和断路器失灵故障组成的双重故障模式,并基于证据理论和功能组分解思想,给出了该故障模式下的N-k事故辨识方法。算例分析表明,双重故障模式下的N-k事故辨识与源发性故障、故障断路器以及相关母线的接线方式有关,而变电站发电厂主接线对N-1事故扩大为N-k事故有直接影响。

According to characteristic in different development stage, the cascading failures may be decomposed as source fault stage and continual fault stage. The article analyzed consequences of different hidden failures in protective device during source fault stage, pointed out importance of breaker failure in research on cascading failures, thereupon proposed one kind of double failure incident composed by source fault and breaker failure. Based on evidence theory and functional group decomposition thought, the paper produced a kind of N-k contingency identification method under this failure mode. Example analysis indicated that N-k contingency identification result correlate with source fault, fault breaker as well as related busbar connection scheme. Furthermore, both power plant bus connection schemes and substation bus connection schemes have direct influence on N-I contingency expansion to N-k contingency.