Imperial College London
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ProfessorBikashPal

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor of Power Systems
 
 
 
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Contact

 

+44 (0)20 7594 6172b.pal Website CV

 
 
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Assistant

 

Miss Guler Eroglu +44 (0)20 7594 6170

 
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Location

 

1104Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Kampitsis:2022:10.1109/OJPEL.2022.3209540,
author = {Kampitsis, G and Batzelis, E and Antonis, K and Elison, M and Pal, B},
doi = {10.1109/OJPEL.2022.3209540},
journal = {IEEE Open Journal of Power Electronics},
pages = {621--634},
title = {A generalized phase-shift PWM extension for improved natural and active balancing of flying capacitor multilevel inverters},
url = {http://dx.doi.org/10.1109/OJPEL.2022.3209540},
volume = {3},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The emergence of wide bandgap power devices has brought the attention back to the flying capacitor (FC) multilevel inverters witha large number of stages, in an effort to increase the power density by minimizing the passive components. The main challenge that such systemsface, particularly the ones based on high-frequency Gallium-Nitride devices and small-value ceramic capacitors, relate to the stringentrequirements for precise and fast capacitor balancing. Conventional natural balancing techniques exhibit poor settling times, while most improvednatural balancing methods are not easily scalable to more than five levels. The alternative of active balancing normally requires one isolatedsensor per FC which increases the overall system cost and footprint, or a single ac-side sensor that is more compact but calls for sophisticatedPWMs that again are not available for multiple levels. In this paper we introduce a generalized pulse width modulation (PWM) strategy based onthe phase-shift and carrier swapping principles for an arbitrary number of levels. We provide an easy and intuitive method for the extraction ofthe PWM pattern, the switching states, and their sequence. Simulations were carried out in Matlab/Simulink and experimental tests were conductedon a single-phase 7-level GaN inverter prototype. Not only is the extended PWM advantageous in natural balancing, but it also provides the rightzero switching states for ac-side FC sensing in active balancing
AU  - Kampitsis,G
AU  - Batzelis,E
AU  - Antonis,K
AU  - Elison,M
AU  - Pal,B
DO  - 10.1109/OJPEL.2022.3209540
EP  - 634
PY  - 2022///
SN  - 2644-1314
SP  - 621
TI  - A generalized phase-shift PWM extension for improved natural and active balancing of flying capacitor multilevel inverters
T2  - IEEE Open Journal of Power Electronics
UR  - http://dx.doi.org/10.1109/OJPEL.2022.3209540
UR  - https://ieeexplore.ieee.org/document/9903053
UR  - http://hdl.handle.net/10044/1/99878
VL  - 3
ER  -
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