Generalized Feed-Forward Sampling Method for Multilevel Cascaded H-Bridge Converters

Multilevel cascaded H-bridge (CHB) converters are usually operated applying a phase-shifted pulsewidth modulation (PS-PWM) method. In this modulation strategy, it is important to define the sampling instants in order to obtain a superior harmonic performance in the CHB output waveforms. Previous app...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2024-08, Vol.71 (8), p.1-9
Main Authors: Alcaide, Abraham M., Poblete, Pablo, Vazquez, Sergio, Aguilera, Ricardo P., Leon, Jose I., Kouro, Samir, Franquelo, Leopoldo G.
Format: Article
Language:English
Subjects:
Computing time
Electric converters
Faces
Harmonic analysis
multilevel converters
Pulse duration modulation
Pulse width modulation
pulsewidth modulation (PWM)
Sampling methods
Switches
Voltage
Voltage control
Waveforms
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Summary:Multilevel cascaded H-bridge (CHB) converters are usually operated applying a phase-shifted pulsewidth modulation (PS-PWM) method. In this modulation strategy, it is important to define the sampling instants in order to obtain a superior harmonic performance in the CHB output waveforms. Previous approaches to define the PS-PWM method consider a shorter sampling time, becoming even smaller when the number of cells of the CHB is large. In addition, unbalanced operational conditions in the CHB aggravate this issue also degrading the CHB harmonic performance. In this article, both challenges (small sampling time and unbalanced operational conditions) are faced. A feed-forward compensation technique is proposed to face with the unbalanced operating conditions and enlarging the available computational time for control schemes keeping the good CHB harmonic performance. Experimental results demonstrate the superior performance of the proposed strategy.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2023.3319737