基于键合图的级联逆变器系统故障诊断技术  

Fault diagnosis technology of cascade inverter systembased on bond graph

作　　者：李佳伟 帕孜来·马合木提[1] LI Jia-wei;PAZILAI·Mahemuti(School of Electrical Engineering,Xinjiang University,Urumqi 830049,China)

机构地区：[1]新疆大学电气工程学院,新疆维吾尔自治区乌鲁木齐830049

出　　处：《陕西科技大学学报》2023年第5期139-144,151,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(61963034)。

摘　　要：旨在改善单相级联型五电平逆变器(SPFLCI)系统的故障检测自适应阈值,使系统的故障诊断更加准确.针对SPFLCI系统复杂的机电结构和多种故障模式,提出了一种基于键合图的级联型逆变器系统故障诊断技术.首先结合键合图理论和受控结点的思想,建立级联逆变器键合图模型.然后通过最小化正常状态下残差与区间阈值之间的间隙来计算各参数的不确定性值的取值范围的上下界,并使用这些新的不确定性值的取值范围生成优化的区间阈值.最后,使用优化区间阈值检测是否有故障发生.仿真结果表明,相对于绝对型(AT)阈值和优化的绝对型(OAT)阈值,优化的区间型(OIT)阈值检测到更多的故障.This paper aims to improve the fault detection adaptive threshold of Single-Phase Cascade Five-Level Inverter(SPFLCI)systems to make the system fault diagnosis more accurate.According to the complex electromechanical structure and various fault modes of the SPFLCI system,we proposed a fault diagnosis technique of cascade inverter system based on bonding diagram.Firstly,established a cascade inverter bond graph model through the bond graph theory and the ideas of controlled knots.Then,the upper and lower bounds of the range of uncertainty values of each parameter were calculated by minimizing the gap between residuals and interval thresholds in a normal state.And generated the optimized interval thresholds using the new ranges of these uncertainties.Finally,the optimized interval type(OIT)threshold is used to detect whether any fault has occurred.The simulation results showed that the OIT threshold can detect more minor faults relative to the absolute type(AT)thresholds and the optimized absolute type(OAT)threshold.

关 键 词：键合图 故障检测与隔离 不确定的系统 自适应阈值 级联逆变器 

分 类 号：TM464[电气工程—电器]