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An Improved Fault Diagnosis and Fault Tolerant Control Strategy for Modular Multilevel Converters With Switch Open-Circuit Faults
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DOI：10.1109/jestpe.2026.3691497.png)
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Abstract
En 中文
The presence of a large number of switches in modular multilevel converters (MMCs) is a cause of significant reliability issues. To improve the reliability of MMCs, this article presents the design and implementation of a comprehensive fault-tolerant (FT) strategy, which consists of a fault detection and localization (FDL) scheme and a fault accommodation control, to allow continued operation of the MMC under several different open-circuit faults (OCFs). The fault detection mechanism involves using features defined on the arm inductors, particularly, the faulty arm is identified by utilizing an error signal between the sum of upper and lower arm capacitor voltages. Then, the faulty submodule is isolated by using the switching signals generated from the capacitors’ voltage sorting algorithm. Finally, a novel fault accommodation scheme is proposed, which employs an indirect finite control set model predictive control (FCS-MPC) scheme to balance the energies in the arms and minimize the effect of the faults. The FT capability is integrated with the normal operation of the MMC, thereby eliminating the need to change the control structure after the FDL. Extensive simulations and experimental results validate the effectiveness of the proposed scheme.
Keywords:
Fault diagnosis
fault-tolerant (FT) control
finite control set model predictive control (FCS-MPC)
modular multilevel converter (MMC)
open-circuit faults (OCFs)
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I
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4.9
Papers:
249
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0
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