基于改进层次模糊评判的智能变电站二次系统状态评估

Abstract

针对智能变电站各二次设备故障机理复杂、具有不确定性、难以有效评估的问题，提出了基于改进层次分析法和模糊评判理论的智能变电站二次系统综合评估方法。以运行检修规程、测试技术规范为基础，综合考虑运行经验、工作环境和检修记录，建立二次设备状态定量和定性评估指标体系，并根据各指标的相对重要性赋予相应权重；通过半梯形分布函数构建状态指标评分模型，并引入相对劣化度来表征二次设备状态转化程度的隶属函数，进而建立层次模糊评判矩阵；由此，建立基于改进层次模糊评判的智能变电站二次系统状态评估模型。实例分析表明该方法有效可行，为智能变电站二次系统健康状态评估提供了新的思路。 For smart substation secondary equipments’ failure mechanism are complex, uncertain and diffi-cult to be effectively evaluated, a comprehensive evaluation method based on improved analytic hierarchy process and fuzzy synthetic evaluation is proposed in this paper. On the basis of run maintenance procedures and test specification and taking operating experience, work environment and maintenance records into consideration, this paper establishes the quantitative and qualitative state evaluation index system of secondary equipment and gives the corresponding weight according to the relative importance of each indicator. Through building the scoring model of state indicator by the semi-trapezoidal distribution function and introducing the relative deterioration degree to characterize the membership function of secondary equipment status transformation degree and to establish a hierarchical fuzzy evaluation matrix. Thus, a condition assessment model of smart substation secondary system based on improved analytic hierarchy process and fuzzy synthetic evaluation is established. Example analysis shows that this method is effective and feasible and provides a new way for the health assessment of smart substation secondary system.