基于GPR的变工况下闭环SEPIC的故障预测  

Closed-loop SEPIC converter fault prediction method based on GPR under variable operating conditions

作　　者：葛震君 帕孜来·马合木提[1] Ge Zhenjun;Pazilai Mahemuti(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830047

出　　处：《电测与仪表》2020年第19期8-13,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(61364010);新疆维吾尔自治区自然科学基金资助项目(2016D01C038)。

摘　　要：变工况下闭环单端初级电感变换器(SEPIC)系统级的故障预测,不仅受故障模式的影响,还受工况变化的影响。针对此问题,采用了一种新颖的变工况下闭环SEPIC变换器系统级故障特征参数(S-FCP)的提取方法,并提出了一种基于高斯过程回归(GPR)对S-FCP退化状态预测的方法。研究了在不同工况下闭环SEPIC变换器关键元件的退化对系统级参数的影响。选取对关键元件退化敏感且退化趋势有规律的系统级参数作为闭环SEPIC变换器的S-FCP,并利用多元最小二乘回归得到额定工况下的S-FCP。基于GPR对S-FCP进行故障预测,实现变工况下闭环SEPIC变换器的故障预测。实验结果证明了该S-FCP提取方法和预测框架的可行性。The system-level fault prediction of a closed-loop single-ended primary inductor converter(SEPIC)under variable operating conditions is not only affected by the fault mode,but also affected by changes in operating conditions.Aiming at this problem,a new extraction method of system-level fault characteristic parameter(S-FCP)for the performance degradation state of the whole converter under variable operating conditions is proposed in this paper.A Gaussian process regression(GPR)based method is proposed to predict the degradation state of S-FCP.Firstly,the influence of key component degradation of closed-loop SEPIC converter on system-level parameters under different operating conditions is studied.Secondly,the system-level parameters that are sensitive to degradation of all key components and have regular degradation trends are selected as the S-FCP of the closed-loop SEPIC converter,and the S-FCP under rated conditions is obtained by multivariate least squares regression.Finally,the fault prediction of S-FCP is carried out based on GPR to realize the fault prediction of closed-loop SEPIC converter under variable operating conditions.Experimental results demonstrate the feasibility and effectiveness of the S-FCP extraction method and prediction framework.

关 键 词：变换器 故障预测 高斯过程回归 故障特征参数 

分 类 号：TM46[电气工程—电器]