基于组合赋权与加权秩和比的电力变压器状态评估

Status Assessment of Power Transformer Based on Combined Weighting and WRSR

输变电设备运行状态评估是电网企业技术管理的重要内容,针对目前电力变压器健康状态评估模型中存在的对状态量单一赋权不合理、实现步骤较为繁琐、算法性能不稳定等问题,文中采用加权秩和比WRSR(weighted rank sum ratio)模型对电力变压器健康状态进行评估,该模型原理简单,易于实现。通过选取电力变压器运行中典型状态量,采用组合赋权的理论对各状态量赋予权值大小,进而计算评估对象的加权秩和比。利用加权秩和比确定待评估对象的概率单位,并将概率单位作为自变量代入回归方程中得到状态评估结果。实际算例分析表明,所构建的评估模型及其方法,不仅可以实现对单台变压器的健康状态评估,还可对多台变压器的运行状态进行综合优劣排序,可有效服务于电力变压器的运维工作。

Operation status assessment of transmission and transformation equipment is an important part of technology management of power grid enterprise. In view of such problems in the current power transformer health status assessment model as unreasonable single weight of state quantity,complicated implementation steps and unstable algorithm performance,the weighted rank sum ratio(WRSR)model is used in this paper to assess the health status of power transformer. The principle of the model is simple and is easy to achieve. By selecting the typical status variables of power transformer in operation and adopting the combination weighting theory,the weights are assigned to each state quantity,thus calculating the weighted rank sum ratio of the assessment object. The weighted rank sum ratio is used to determine the probability unit of the object to be assessed,and the probability unit is substituted into the regression equation as an independent variable to obtain the status assessment results. The actual calculation analysis shows that the constructed assessment model and method can not only achieve health status assessment of single transformer,but also sort the operation status of multiple transformers,which can effectively serve the operation and maintenance of power transformer.