电力系统保护与控制2025，Vol.53Issue(20)：120-130,11.DOI:10.19783/j.cnki.pspc.241648
基于自适应滑模观测器的级联H桥光伏逆变器开路故障诊断方法
Open-circuit fault diagnosis method for cascade H-bridge PV inverters based on adaptive sliding mode observer
摘要
Abstract
To diagnose single-and double-switch open-circuit faults in cascaded H-bridge(CHB)photovoltaic(PV)grid-connected inverters,an open-circuit fault diagnosis method based on an adaptive sliding mode observer is proposed.First,an adaptive sliding mode observer is designed using the mixed logic dynamic(MLD)model of the CHB PV inverter,and fault detection variables are constructed based on actual and estimated currents.Second,voltage thresholds derived from the DC-side capacitor voltage are used for fault module localization.Then,fault localization variables are constructed from current residuals,and the variations of current residuals of the adaptive sliding mode observer under fault conditions are compared to distinguish diagonal switch faults.Finally,double-switch open-circuit fault diagnosis is realized by designing an adaptive sliding mode observer based on the previous fault state.Experiment results show that the proposed method can accurately identify single-and double-switch faults at any position within one fundamental cycle,with fast diagnosis speed and strong robustness.关键词
级联H桥/自适应滑模观测器/电压阈值/电流残差/故障诊断Key words
cascaded H-bridge/adaptive sliding mode observer/voltage threshold/current residual/fault diagnosis引用本文复制引用
郑征,薄佳林,李斌..基于自适应滑模观测器的级联H桥光伏逆变器开路故障诊断方法[J].电力系统保护与控制,2025,53(20):120-130,11.基金项目
This work is supported by the National Natural Science Foundation of China(No.U1804143). 国家自然科学基金项目资助(U1804143) （No.U1804143）
河南省重点研发专项资助(241111241700) （241111241700）
河南省国际科技合作项目资助(232102520017) （232102520017）
