针对配电网故障寻址中经常遇到的多区段故障和故障指示器拒动误动等问题,提出了一种基于可信度的多区段故障诊断方法.采用基于可辨识矩阵的属性约简算法对原始决策表进行约简,根据约简决策表和故障指示器的实际状态将区段分为峰、谷、坡三种.在分析峰及其组合发生故障可信度的基础上,把故障指示器的理想状况与实际状况的最大匹配问题转化成峰的最佳组合问题.同时,提出了一种寻找异脉峰组及递推不一致故障指示器的尾部添峰法,使基于故障指示器的配电网故障寻址系统不仅诊断速度快而且通用性强.
Considering mal-operation and refusal-operation of fault indicators, an approach of multi-sections fault diagnosis based on creditability was proposed. In order to simplify the original decision table, an attribute reduction algorithm based on distinct matrix was used. The section was divided into three kinds, peak, valley, and slope, according to the reductive decision table and the actual states of fault indicators. The task of finding the maximum match degree between the ideal states and actual states of fault indicators was transformed into finding the best combination of the peaks by analyzing the fault creditability of peaks and their combinations. By means of increasing peak on the tail, the peaks on different ridges and inconsistent fault indicators could both be found out easily, and the distribution network fault addressing based on fault indicators became flexible and universal.