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{Collins:2020:10.1109/tie.2019.2907511,
author = {Collins, C and Green, T},
doi = {10.1109/tie.2019.2907511},
journal = {IEEE Transactions on Industrial Electronics},
pages = {2834--2843},
title = {Comparative analysis of an MV neutral point clamped AC-CHB converter with DC fault ride-through capability},
url = {http://dx.doi.org/10.1109/tie.2019.2907511},
volume = {67},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The AC side cascaded H-bridge converter with a two-level main bridge has previously been proposed as a fault tolerant converter for HVDC. This paper explores the benefits of replacing the two-level bridge with a neutral point clamped three-level (NPC) bridge for MVDC applications and defines the optimum operating conditions for this case. By modifying the topology to include an NPC main bridge, the peak stack voltage during normal operation is decreased considerably which results in a 58% reduction in the required number of sub-modules (SM), thereby significantly increasing efficiency. However, this sacrifices the fault ride-through capability as the stacks are no longer able to support the AC voltage and thus two new SM topologies are proposed. The proposed topologies function as single full-bridges with two capacitors in parallel during normal operation. Under fault conditions, the SMs divide into two series connected full-bridges to enable DC fault ride-through. Reverse-blocking IGCTs or ultra-fast mechanical switches are used to bypass the IGBTs which are unused in normal operation and therefore the topology maintains a high efficiency. Simulation results are shown, and the proposed topologies are compared with more conventional designs in terms of efficiency, energy storage requirement and device count.
AU  - Collins,C
AU  - Green,T
DO  - 10.1109/tie.2019.2907511
EP  - 2843
PY  - 2020///
SN  - 0278-0046
SP  - 2834
TI  - Comparative analysis of an MV neutral point clamped AC-CHB converter with DC fault ride-through capability
T2  - IEEE Transactions on Industrial Electronics
UR  - http://dx.doi.org/10.1109/tie.2019.2907511
UR  - http://hdl.handle.net/10044/1/68666
VL  - 67
ER  -
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