A New Hybrid Multi-Level Voltage-Sourced Converter with DC Fault Blocking Capability

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Title: A New Hybrid Multi-Level Voltage-Sourced Converter with DC Fault Blocking Capability
Author(s): Merlin, MMC
Green, TC
Mitcheson, PD
Trainer, D
Critchley, R
Crookes, RW
Item Type: Conference Paper
Abstract: Voltage-Source Converters have brought numerous advantages to HVDC transmission. However, they suffer from high losses and are usually weak against faults on the DC-side. In this paper, a new topology which brings together some concepts from traditional Current Source Converters and multi-level converters, is presented. Two stacks of H-bridge cells alternate to construct the converter voltage using director switches made of IGBTs in series. The resulting converter generates AC current with low harmonic content and with low loss. Furthermore, the converter is still very responsive in case of a fault. This paper first explains the composition and the working of this converter, then detailed simulations at 20 MW illustrate the performances and low losses of this converter under normal conditions. The ability of this topology to deal with abnormal conditions is also demonstrated, especially its ability to keep control of the current despite the collapse of the DC bus voltage, e.g. a DC-side fault.
Publication Date: 19-Oct-2010
URI: http://hdl.handle.net/10044/1/11020
DOI: http://dx.doi.org/10.1049/cp.2010.0987
Copyright Statement: © 2010 IET. First published at the IET Conference on AC and DC Power Transmission 2010.
Conference Name: IET Conference on AC/DC Transmission
Publication Status: Published
Start Date: 2010-10-19
Finish Date: 2010-10-21
Conference Place: London
Appears in Collections:Electrical and Electronic Engineering

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