基于模糊物元-逼近理想点法的油纸绝缘状态评估

Evaluation of Oil-Paper Insulation Condition Based on Fuzzy Matter Element-Technique for Order Preference by Similarity to Ideal Solution Method

针对变压器油纸绝缘状态评估的指标参数具有不确定性和模糊性的特点,提出模糊物元-逼近理想点(TOPSIS)法的油纸绝缘状态评估模型。首先,分别通过等效电路参数、回复电压法和极化去极化电流法提取特征量,建立变压器油纸绝缘状态评估的指标体系;其次,对特征量通过从优隶属度计算得到模糊量值,并用模糊物元表征;然后,通过层次分析法和熵权法,分别从主观和客观两方面确定特征量的组合权重;最后,利用逼近理想解方法,通过评估变压器与正理想解的贴近度对其油纸绝缘状态进行评估。实例计算表明,采用该模型进行变压器油纸绝缘状态评估结果的客观性和准确性。

In view of the uncertainty and fuzziness of the parameters of the evaluation for transformer oil-paper insulation condition,an evaluation model based on fuzzy matter element and technique for order preference by similarity to ideal solution(TOPSIS)is proposed for the oil-paper insulation condition.Firstly,the characteristics were extracted by equivalent circuit parameters,return voltage method and polarization depolarization current method respectively.The index system of transformer oil-paper insulation condition evaluation is accordingly established.Secondly,the fuzzy value is calculated by the preferred subjection degree of the characteristics,which is represented by fuzzy matter element.Then,the combination weight coefficient of the characteristics is determined from the subjective and objective aspects respectively by using analytic hierarchy process(AHP)and entropy weight method.Lastly,using TOPSIS method,the oil-paper insulation condition is evaluated by assessing the closeness degree of the transformer and the positive ideal solution.The results show the objectivity and accuracy of the proposed model for transformer oil-paper insulation condition evaluation.