Research on fault isolation method for composite fault in power module of modular multilevel converter
by Yue Mo; Ming Liu; Feng Zheng; Zetao Li
International Journal of Modelling, Identification and Control (IJMIC), Vol. 39, No. 2, 2021

Abstract: The fault diagnosis technology of modular multilevel converter has important engineering significance. Isolation of composite fault is a difficult problem in fault diagnosis. In this paper, the isolation method of composite fault in modular multilevel converter power module is studied. The structural fault is modelled. The isolation problem of parametric fault superimposed with structural faults is discussed. A composite fault isolation method for power module of modular multilevel converter is established. Aiming at the problem of gradualy closing of fault isolability window caused by structural fault, an offline fault isolation method for power module composite fault based on dynamic trajectory is proposed. Simulation experiment shows the effectiveness of the proposed method.

Online publication date: Mon, 20-Jun-2022

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