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Optimization-Based Capacitor Balancing Method with Selective DC Current Ripple Reduction for CHB Converters
 
 
Article

Optimization-Based Capacitor Balancing Method with Customizable Switching Reduction for CHB Converters

Electronical Engineering Department, University of Seville, 41092 Seville, Spain
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Authors to whom correspondence should be addressed.
Academic Editor: Abraham Marquez
Energies 2022, 15(6), 1976; https://doi.org/10.3390/en15061976
Received: 14 February 2022 / Revised: 4 March 2022 / Accepted: 7 March 2022 / Published: 8 March 2022
(This article belongs to the Special Issue Advances in Multilevel Converter/Inverter Topologies and Applications)
This paper presents a method for switching reduction in cascaded H-bridge converters. Given the wide applicability of this topology, it would be especially desirable to increase its efficiency with switching losses reduction techniques. Since this type of converter requires voltage balancing methods, several modulation methods consider the possibility of combining the balancing and switching reduction goals together. In this paper, a previously disclosed optimization-based balance method was modified further to consider the switching losses in its objective function. Each commutation was penalized in proportion to the phase current and the module voltage, thus avoiding commutations that would produce the most losses but tolerating low-losses commutations. The structure of the original method was maintained so that the algorithm could be applied with minimal change. The results show that it is possible to reduce the switching up to 14% without any noticeable drawback and up to 22% at the cost of a greater DC-link ripple. It is also possible to selectively reduce the effective switching frequency of only some modules, making it significantly low. This extends the adaptability of the converter, possibly allowing hybrid converters with modules of different transistor technologies. View Full-Text
Keywords: capacitor balance; cascaded H-bridge converter (CHB); common-mode voltage; commutations reduction; multilevel converter; optimal control; pulse-width modulation (PWM); switching losses capacitor balance; cascaded H-bridge converter (CHB); common-mode voltage; commutations reduction; multilevel converter; optimal control; pulse-width modulation (PWM); switching losses
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MDPI and ACS Style

Galván, L.; Gómez, P.J.; Galván, E.; Carrasco, J.M. Optimization-Based Capacitor Balancing Method with Customizable Switching Reduction for CHB Converters. Energies 2022, 15, 1976. https://doi.org/10.3390/en15061976

AMA Style

Galván L, Gómez PJ, Galván E, Carrasco JM. Optimization-Based Capacitor Balancing Method with Customizable Switching Reduction for CHB Converters. Energies. 2022; 15(6):1976. https://doi.org/10.3390/en15061976

Chicago/Turabian Style

Galván, Luis, Pablo J. Gómez, Eduardo Galván, and Juan M. Carrasco. 2022. "Optimization-Based Capacitor Balancing Method with Customizable Switching Reduction for CHB Converters" Energies 15, no. 6: 1976. https://doi.org/10.3390/en15061976

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