基于层次分析法与改进D-S理论的阀水冷系统状态评估

为了及时评估保障换流阀可靠运行的阀水冷系统运行状态，首先，分析了换流站阀水冷系统整体构成，选取主要历史数据和实时数据构建了评估指标体系，通过三角形函数和半梯形函数以及专家调查法确定各个指标的隶属度；其次，基于层次分析法确定各个评估指标权重，改进D-S理论建立阀水冷系统运行状态评估模型；最后，通过采集实际工程阀水冷系统主要指标数据对模型进行了验证，并以阀水冷系统滤芯清洗前后数据为例对评估结果进行了对比。结果表明，所建模型能够对阀水冷系统运行状态做出准确识别和评估，有利于运维人员及时掌控阀水冷系统运行状态，保障其可靠运行。

State evaluation of valve water cooling systems based on AHP and improved D-S evidence theory

With the continuous increase in ultra-high voltage transmission levels and capacities,a significant challenge has emerged due to the sharp rise in heat generated during the operation of the converter valves in converter stations.This study aims to timely evaluate the operational status of valve water cooling systems to ensure the reliable operation of converter valves.Firstly,the study analyzes the overall composition of valve water cooling systems in converter stations,selecting key historical and real-time data indicators to construct an evaluation index system.Membership degrees for each indicator are determined using triangular and semi-trapezoidal functions as well as expert survey methods.Secondly,the research uses the analytic hierarchy process to determine the weights of various evaluation indicators.It develops a model for assessing the operational status of valve cooling systems based on an improved D-S evidence theory.Finally,the model is validated using data collected from key indicators of actual valve cooling systems in engineering projects.The evaluation results are compared using data from before and after cleaning the filter elements of the valve water cooling systems.The findings indicate that the established model can accurately identify and evaluate the operational status of the valve water cooling systems.It is beneficial for operating and maintenance personnel to timely manage the operational status of the valve water cooling system and ensure its reliable operation.