Active DC fault management of a bipolar full-bridge MMC-HVDC scheme with metallic return

Besides offshore applications, MMC-HVDC is discussed for embedded onshore structures. In contrast to their maritime counterparts, these systems shall be carried out with overhead transmission lines to minimize investment costs. To avoid a full outage in case of a dc fault, bipolar topologies seem ad...

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Bibliographic Details
Published in2016 IEEE International Energy Conference (ENERGYCON) pp. 1 - 6
Main Authors Wenig, S., Goertz, M., Suriyah, M., Leibfried, T.
Format Conference Proceeding
LanguageEnglish
Published IEEE 14.07.2016
Subjects
active fault clearing
bipolar MMC-HVDC
control and protection
dc fault
Fault detection
full-bridge
Grounding
overhead line
Power transmission lines
Reliability
Transient analysis
Varistors
Voltage control
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Summary:Besides offshore applications, MMC-HVDC is discussed for embedded onshore structures. In contrast to their maritime counterparts, these systems shall be carried out with overhead transmission lines to minimize investment costs. To avoid a full outage in case of a dc fault, bipolar topologies seem advantageous considering reliability aspects. While ground currents during asymmetric operation are unwanted, an additional return path needs to be introduced. This paper presents an active clearing sequence of a bipolar full-bridge MMC-HVDC system with metallic return. Subsequent to a pole to ground fault, detection, short term asymmetric operation and full system restoration are investigated. If blocking of the IGBT modules can be avoided to maintain the converters in a controllable mode, the midpoint voltage shift at the ungrounded terminal has to be explicitly considered in system controls. Transient simulations validate the developed methodology.
DOI:10.1109/ENERGYCON.2016.7514052