变压器状态评估指标权重计算的未确知有理数法

Calculation Method of Power Transformer Condition Assessment Index Weight Using Unascertained Theory

多信息量融合的电力变压器状态评估中,评估指标的权重确定是极为关键的环节。目前在进行变压器状态评估时,指标权重的确定主要依赖专家经验,而专家意见的未确知性带来了判断的不确定性。为此,引入未确知数学理论,提出了基于未确知有理数的变压器状态评估指标权重计算方法。通过建立评估指标重要性程度的未确知有理数,有效减小了专家主观性对权重量化结果的影响。理论分析和实例验证表明,基于未确知有理数的评估指标权重计算方法与现在使用较多的层次分析法相比不仅计算过程大为简化,实用性更强,而且计算结果也更符合实际,该方法可以为更准确地评估电力变压器的状态提供参考。

Calculating index weight is critical for power transformer integrative condition assessment,and the weights of evaluation indicators mostly depend on expertise at present.Experts’ unascertained knowledge and experience make the indicators weight results uncertain.Thereby,we adopted the unascertained mathematics theory to determine the weight values of assessment indicators.The impact of the experts’ subjectivity on the results of index weight was effectively reduced by constructing the unascertained rational numbers.The case analysis show that the calculation method of power transformer condition assessment index weight by the unascertained theory can greatly reduce the process of calculating compared with the analytic hierarchy process.The calculation method can provide a reference for evaluating the comprehensive state of power transformer more accurately.