Fault tolerant controller for a generalized n-level CHB multilevel converter

Mtepele, Kassim O.; Campos-Delgado, Daniel U.; Fernández, A.; Pecina-Sanchez, J. A.

doi:10.1109/ciep.2016.7530734

Cited by 6 publications

(12 citation statements)

References 22 publications

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“…For this purpose, a current reference i S * proportional to the fundamental component of the source voltage v S is constructed to provide an almost pure sinusoidal source current i S . Similar to [10,25], the injected current i and the voltages in the H-bridges (v C1 , …, v CN ) are assumed known variables in the control and fault diagnosis methodologies.…”

Section: Chb-n L Multilevel Convertermentioning

confidence: 99%

“…After an OCF in the jth H-bridge, the voltage gain in this module is reduced, since either the positive or negative portion of the output voltage cannot be produced [10]. Under this perspective [18], the jth faulty duty cycle u j f (t) is modelled as…”

Section: Fault Modelling In the Chb-n L Convertermentioning

confidence: 99%

“…□ As previously discussed, a sliding-mode integral observer is used in this work for the estimation of the fault profile DC components and to improve the FDI robustness and sensitivity. Three significant remarks can be summarised regarding on the properties of the sliding-mode integral observer in (8)- (10) • The dimension of the observer depends on the number of Hbridges in the CHB-n L multilevel converter. • The values of the observer gains…”

Section: Sliding-mode Integral Observer Designmentioning

confidence: 99%

“…Proof of Proposition 1: In addition to e i and e v j defined in expression (11), the following error signal is introduced e f j ≜ f j DC − f^j (18) Then, from the dynamic equations in (6)- (10), the time derivative along the error signals leads to the following dynamic model…”

Section: Appendixmentioning

confidence: 99%

“…Consequently, fast and efficient diagnosis procedures for the power switching devices become an important research line [5, 9]. These diagnosis strategies can be further used to include a fault accommodation structure, so that a fault‐tolerant control strategy could be adopted for systems that require high reliability [3, 10]. Additionally, in high‐power applications where discrete transistor modules are used, the location of the faulty switch by the diagnostic scheme reduces the converter repair time and the associated cost [9].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Model‐based strategy for open‐circuit faults diagnosis inn‐level CHB multilevel converters

Mtepele

Campos-Delgado

Fernández

et al. 2019

IET Power Electronics

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Here, the authors study open-circuit faults (OCFs) in the power switches of multilevel converters with a model-based perspective. In specific, the authors address single-phase cascaded H-bridge (CHB) converters with n-levels in its output voltage (CHB-n L), which are designed as shunt active power filters. In this task, the OCFs are modelled by fault profiles with an additive structure in each subsystem of the CHB-n L converter. These additive fault profiles have constant and oscillatory components, where the constant term sign indicates the pair of damaged switches in the H-bridge. Hence, a sliding-mode integral observer is proposed to estimate the constant terms of the fault profiles. The complexity of the observer depends on the number of H-bridges in the CHB-n L converter. As a result, the proposed fault detection and isolation (FDI) scheme relies on the estimated constant terms of the additive fault profiles to achieve a robust and fast diagnosis stage. The proposed model-based FDI scheme is validated experimentally under single and multiple fault scenarios, and model uncertainty. During the evaluation, the derived methodology only requires less than one cycle of the fundamental frequency to isolate the faults, and show robustness to load changes and parametric uncertainty.

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Section: Chb-n L Multilevel Convertermentioning

confidence: 99%

Section: Fault Modelling In the Chb-n L Convertermentioning

confidence: 99%

Section: Sliding-mode Integral Observer Designmentioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%