Imperial College London
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Professor Tim Green, FREng

Faculty of Engineering, Department of Electrical and Electronic Engineering

Academic Leader for Sustainability, Professor
 
 
 
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Contact

 

+44 (0)20 7594 6171t.green Website CV

 
 
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Location

 

1107EElectrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Fan:2022:10.1109/TPEL.2021.3105122,
author = {Fan, S and Xiang, X and Sheng, J and Gu, Y and Yang, H and Li, W and He, X and Green, T},
doi = {10.1109/TPEL.2021.3105122},
journal = {IEEE Transactions on Power Electronics},
pages = {1352--1368},
title = {Inherent SM voltage balance for multilevel circulant modulation in modular multilevel DC-DC converters},
url = {http://dx.doi.org/10.1109/TPEL.2021.3105122},
volume = {37},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The modularity of a modular multilevel dc converter (MMDC) makes it attractive for medium-voltage distribution systems. Inherent balance of submodule (SM) capacitor voltages is considered as an ideal property, which avoids a complex sorting process based on many measurements thereby reducing costs and enhancing reliability. This article extends the inherent balance concept previously shown for square-wave modulation to a multilevel version for MMDCs. A switching duty matrix dU is introduced: it is a circulant matrix of preset multilevel switching patterns with multiple stages and multiple durations. Inherent voltage balance is ensured with a full-rank dU . Circulant matrix theory shows that this is equivalent to a simplified common factor criterion. A nonfull rank dU causes clusters of SM voltage rather than a single common value, with the clusters indicated by the kernel of the matrix. A generalized coprime criterion is developed into several deductions that serve as practical guidance for design of multilevel circulant modulation. The theoretical development is verified through full-scale simulations and downscaled experiments. The effectiveness of the proposed circulant modulation in achieving SM voltage balance in an MMDC is demonstrated.
AU  - Fan,S
AU  - Xiang,X
AU  - Sheng,J
AU  - Gu,Y
AU  - Yang,H
AU  - Li,W
AU  - He,X
AU  - Green,T
DO  - 10.1109/TPEL.2021.3105122
EP  - 1368
PY  - 2022///
SN  - 0885-8993
SP  - 1352
TI  - Inherent SM voltage balance for multilevel circulant modulation in modular multilevel DC-DC converters
T2  - IEEE Transactions on Power Electronics
UR  - http://dx.doi.org/10.1109/TPEL.2021.3105122
UR  - http://hdl.handle.net/10044/1/101338
VL  - 37
ER  -
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