一种基于三角模糊数理论的断路器状态评估改进方法

An Improved Method for Condition Assessment of Circuit Breaker Based on Triangular Fuzzy Number Theory

在断路器状态评价的研究中常采用模糊综合评价模型,其评价指标权重的选择主要依赖于经验,可能出现与实际情况不符的现象。针对这一问题,在原有的模糊综合评价模型基础上,提出了应用三角模糊数理论计算断路器状态评估中各指标权重的改进方法。使用"正态云"模型表示各指标的隶属度函数,对各因素的隶属度值进行计算,得到各因素的评估结果;再使用三角模糊数计算各因素的权重,确定断路器在整体运行中的状态和评估结果,由最大隶属度原则及其评语集得出断路器的状态评语。最后,对成都市某变电站内SF_6断路器进行评估,验证了该方法的有效性。

The fuzzy comprehensive evaluation model is often used in the state evaluation research of circuit breakers. The weights for different evaluation indexes mainly depend on the expertise, which could be inconsistent with the actual situation. Regarding this issue, this paper proposes a triangular fuzzy number based improved method to calculate the weight of each index in the state evaluation of the circuit breakers. Each state factor set for the circuit breakers is established. The membership function of each index is calculated by the normal cloud model. Based on the membership calculation of the each index, the evaluation results are obtained. The triangular fuzzy number is utilized to calculate the weight of the each index and determine the states and evaluation results of the circuit breakers in the whole operation. The maximum membership principle can evaluate the state of the circuit breakers. This model is used to evaluate the state of SF6 circuit breakers for a certain substation in Chengdu. Finally, the effectiveness of this method is verified.