基于故障树的电气主接线可靠性及薄弱环节分析

针对电力系统规划、设备选型、故障诊断等问题进行研究,提出一种基于故障树和重要度分析的电气主接线可靠性评估新方法。运用故障树分析法将系统拓扑结构转换为元件逻辑关系,简单直观的反映出系统故障根本原因,选取可靠性基本特征量,结合元件的结构重要度、概率重要度、关键重要度对比分析找出系统薄弱环节,实现了电气主接线可靠性的定性和定量评估。通过桥式接线案例分析,计算出基本电气元件三种重要度并进行排序,探讨了元件合并对评估结果的影响,同时验证了该方法的合理性。

Reliability evaluation of main electrical connection based on fault tree analysis and weak part identification

Studying the problems of power system planning, equipment selection and fault diagnosis, a new method for reliability evaluation of main electrical connection based on fault tree and elements importance analysis is proposed. The fault tree analysis method is used to convert the system topology into elements logical relations, which simply and intuitively reflects the reason of system failure. Selecting the reliability basic characteristics, comparing the structure importance, probability importance, and criticality importance of elements to identify the weak part of the system, then the reliability of main electrical connection is evaluated qualitatively and quantitatively. Through a case analysis of bridge-circuit configuration, three electrical elements importance were calculated and sorted respectively, and the influence of elements combination on the evaluation results was discussed, thus the rationality of the method is verified.