基于模糊物元法的电力电容器的绝缘状态评估

针对电力电容器绝缘状态评估的指标参数具有不确定性和模糊性的特点,提出基于模糊物元法的状态评估模型。首先,通过电力电容器绝缘状态在线监测技术,提取了与电力电容器绝缘状态相关的特征量,包括电量监测法中三相不平衡电压、实际运行电压、电容量、介质损耗因数以及非电量监测法中的油色谱三比值,建立电力电容器绝缘状态评估的指标体系;按等规聚丙烯薄膜的结晶度,将电力电容器绝缘状态划分为正常、老化、严重等3级状态。其次,应用"乘法"集成法对层次分析法和最大熵权技术法进行处理,获取了主客观综合赋权系数。然后,对特征量通过从隶属度计算得到模糊量值,并用模糊物元表征。最后,评估未知绝缘状态电力电容器与正理想解的关联度,判断其绝缘状态。实例分析验证了基于模糊物元法的状态评估模型能够有效地评估电力电容器的绝缘状态。

The Evaluation on Insulation State of Power Capacitors Based on Fuzzy Matter Element Method

Abstract] Aiming at the uncertainty and ambiguity of the index parameters of power capacitor insulation state evaluation, a state estimation model based on fuzzy matter-element method is proposed. Firstly, through the on-line monitoring technology of the power capacitor insulation state, the characteristic quantities related to the insulation state of the power capacitor are extracted, including the three-phase unbalanced voltage, the actual operating voltage, the capacitance, the dielectric loss factor and the non-electricity monitoring method in the electricity monitoring method. The oil chromatography three ratios establish an indicator system for the evaluation of the insulation state of power capacitors. Then, according to the crystallinity of the isotactic polypropylene film, the insulation state of the power capacitor is divided into three levels of normal, aging, and severe. Secondly, the multiplication integration method is applied to process the analytic hierarchy process and the maximum entropy weight technology method, and the subjective and objective comprehensive weighting coefficients are obtained. Then, the feature quantity is obtained by calculating the blur quantity value from the membership degree, and is characterized by the fuzzy matter element. Finally, the correlation between the unknown insulated state power capacitor and the positive ideal solution is evaluated to determine its insulation state. The example analysis verifies that the state estimation model based on fuzzy matter-element method can effectively evaluate the insulation state of power capacitors.