The increasing importance of cascaded H-bridge multilevel converters (CHBMCs) in high-power applications requires a higher priority to detect and protect against fault conditions. In this article, a current residual-based diagnosis scheme is proposed for the CHBMCs without additional sensors. On the premise of filtering the sampled dc voltages, comparing the calculated actual values of output current with the expected values in the control system, normalized diagnostic variables are established to localize single or multiple open-circuit switches. Benefit from the diagnostic variables corresponding directly to the switches of each H-bridge, this method can be easily extended to the CHBMCs with arbitrary submodules. Furthermore, the parameter estimation and enhanced detection algorithm are introduced to ensure the immunity of the diagnostic method to the large parameter changes and measurement noises. The faulty component can be accurately diagnosed within one line cycle regardless of the faulty modules and operating conditions. The effectiveness of the proposed method is substantiated using experimental results from the hardware platform of the CHBMCs.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A Fast Diagnosis Scheme for Multiple Switch Faults in Cascaded H-Bridge Multilevel Converters


    Contributors:
    Xie, Dong (author) / Lin, Chunxu (author) / Deng, Qingli (author) / Ge, Xinglai (author) / Gou, Bin (author)


    Publication date :

    2021-09-01


    Size :

    13485516 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Fast fault detection of open power switch in cascaded H-bridge multilevel inverters

    Mukherjee, Suvajit / Zagrodnik, Michael Adam / Wang, Peng | IEEE | 2016


    Switching Scheme for Cascaded Multilevel Converters with Non-Equal DC Sources

    Rangarajan, Rajmohan / Villaseca, F. Eugenio | AIAA | 2008


    Control of modular multilevel transformerless cascaded bidirectional converters

    Cong Wang / Guang-lin Sha / Jun Wang et al. | IEEE | 2014


    Reliable detection of open-circuit faults in cascaded H-bridge multilevel inverter via current residual analysis

    Thantirige, Kalpani / Mukherjee, Suvajit / Zagrodnik, Michael A. et al. | IEEE | 2017


    Control Scheme of Transformer Magnetic Bias Suppression in Cascaded H-Bridge Multilevel Inverters

    Li, Yufei / Wang, Yue / Feng, Yupeng et al. | British Library Online Contents | 2015