摘要电力设备的安全运行对于电网安全一直非常重要，所以需要对电力设备进行和发展 状态检修，用来确保电网的安全运行。作为至关重要的电力设备，电力变压器的状态信 息与电网的安全息息相关。本文结合模糊理论的知识，对电力变压器的状态进行评估， 以达到对变压器状态检修的目的。

本文通过研究影响变压器状态的各个因素和各个因素的类别，从电气试验、变压器 油中气体色谱分析、绝缘油特性、运行巡检和其它因素等方面建立了变压器状态评估指 标体系，在此基础上建立了模糊综合评判法的因素集；建立了{优秀，良好，一般，注意} 的评判集作为评价变压器状态的四个层次等级；利用了改进的灰色关联度法确定了影响 变压器状态的因素的权重集。为了实现综合评判，对可以量化的指标值，引入了相对劣 化度进行归一化，归一化的数据通过隶属函数的分布函数确定了评判矩阵；对于不能量 化的指标，采用模糊统计法对指标进行了量化，确定相应的评判矩阵。最终利用合适的 模糊算子 M(·，⊕）合成评判矩阵和权重集得到最终的模糊综合评判的结果。使用 MATLAB 对模糊综合评判的过程编写算法，并运用实例证明了该算法的可行性。78755

毕业论文关键词 模糊理论 电力变压器 状态评估 模糊综合评价法

毕 业 设 计 说 明 书 外 文 摘 要

Title Research on Method of Transformer Condition Eva- luation Based on the Fuzzy Theory

Abstract The safe operation of the power equipment is very important for the safety of the power grid, so it is necessary to carry out and develop the condition maintenance of the power equipment。 As the most important power equipment, the state information of power transformer is closely related to the security of the power system。 In order to achieve the purpose of transformer condition based maintenance, the fuzzy theory is used to evaluate the status of the power transformer。

In this paper,factors affecting the status of the transformer and the categories of factors are discussed,indicator system for transformer condition assessment is established on electrical test, transformer oil gas chromatographic analysis, insulating oil characteristics, operation inspection and other factors。Based on this indicator system for transformer condition assessment,the factor set of fuzzy comprehensive evaluation is established; a evaluation set,{excellent, good, in general, attention} is established as four levels of transformer state ; the improved gray correlation analysis method is used for determining the weight set of the factors affecting the state of transformer。In order to realize the comprehensive evaluation,quantitative index values are normalized by introducing the relative inferiority degree。Evaluation matrix is determined by the distribution function of membership function using the normalized data。 In order to determine the corresponding evaluation matrix,the fuzzy statistical method is used to quantify non-quantitative factors 。 Finally, the appropriate fuzzy operator,M(·，⊕),is used for obtaining the result of synthetic evaluation matrix and weight set 。 MATLAB is used to write the process of fuzzy comprehensive evaluation, and the feasibility of the algorithm is proved by examples。

Keywords fuzzy theory power transformer condition evaluation fuzzy synthetic evaluation method

目 次

1 绪论 1

1。1 研究背景及意义