基于变权重模糊综合评判法的保护装置状态评价

Condition evaluation approach of protective devices based on fuzzy comprehensive evaluation with variable weight

为提高保护装置状态评价的准确性,提出了一种基于变权重模糊综合评价的保护装置状态评价方法。提取保护装置的主要影响因素,并增加新的指标,进一步完善保护装置状态评价指标集,并对各项指标采用极值处理法进行标准化处理;以模糊层次分析法(FAHP)和熵值法确定的组合常权重为基础,引入变权原理调整各指标的权重系数。同时,选取半梯半岭型隶属函数分布模型求取模糊关系矩阵,并与三角形分布模型进行了对比;最后,利用加权平均算子对保护装置进行状态评估。算例分析表明,该状态评估方法能更准确地反映保护装置的运行状态,可为状态检修、风险评估提供分析方法和定量依据参考。

In order to improve the condition evaluation accuracy of protective devices,a condition evaluation approach of protective devices based on the fuzzy comprehensive evaluation with variable weight is proposed in this paper.Firstly,the main influencing factors of the protective device operation level are extracted.A new index is supplemented,and the condition-evaluation index set for protective devices is further improved.Secondly,the extremum processing method is utilized to standardize the indices.Subsequently,the fuzzy analytic hierarchy process(FAHP)and entropy weight method are employed to determine the combination weight coefficient,and then,the variable weight principle is introduced to adjust the weight coefficient of each index.Meanwhile,distribution model of the semi-ladder and semi-ridge membership function is selected to obtain the fuzzy relation matrix,and compared with the triangle distribution model.Finally,the weighted average operator is selected to evaluate the state of the protective device.Case study shows that the proposed approach can more accurately reflect the operating status of protective devices,while providing a reasonable reference for condition-based maintenance and risk assessment.