| 引用本文: | 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. |
| ZHENG Zheng,BO Jialin,LI Bin.Open-circuit fault diagnosis method for cascade H-bridge PV inverters based on adaptive sliding mode observer[J].Power System Protection and Control,2025,53(20):120-130 |
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| 摘要: |
| 为实现级联H桥(cascaded H-bridge, CHB)光伏并网逆变器单管和双管开路故障诊断，提出了一种基于自适应滑模观测器的开路故障诊断方法。首先基于CHB光伏逆变器混合逻辑动态(mixed logic dynamic, MLD)模型设计自适应滑模观测器，并根据实际电流和估计电流设计故障检测变量。其次根据直流侧电容电压设计电压阈值进行故障模块定位。然后通过电流残差构造故障定位变量，比较故障状态下自适应滑模观测器的电流残差变化以实现对角管的区分。最后设计前次故障状态下的自适应滑模观测器实现双管开路故障诊断。实验结果表明，所提出的诊断方法可在一个基波周期内准确识别任意位置的单管和双管故障，诊断速度快、鲁棒性强。 |
| 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 |
| DOI：10.19783/j.cnki.pspc.241648 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(U1804143)；河南省重点研发专项资助(241111241700)；河南省国际科技合作项目资助(232102520017) |
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| Open-circuit fault diagnosis method for cascade H-bridge PV inverters based on adaptive sliding mode observer |
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ZHENG Zheng1, 2, BO Jialin1, 2, LI Bin1, 2
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1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China; 2. Henan International
Joint Laboratory of Direct Drive and Control of Intelligent Equipment, Jiaozuo 454003, China
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| 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. |
| Key words: cascaded H-bridge adaptive sliding mode observer voltage threshold current residual fault diagnosis |
