Abstract
Fault discrimination and protection coordination for a bipolar full‐bridge MMC‐HVDC scheme
Highlights
Bipolar high-voltage direct current transmission solutions based on modular multilevel converters (MMC-HVDC) provide an attractive set of operational benefits compared to traditional ac grid enforcement [1]
To supplement available literature mainly dealing with dc fault current interruption (FCI) and restart procedures [2, 3], this work focuses on protection scheme design and threshold determination to obtain high selectivity
A separation between several internal protection zones, where faults are cleared by blocking insulated-gate bipolar transistors (IGBTs) and ac breaker operation, and a dc protection zone for each individual converter has to be established
Summary
Bipolar high-voltage direct current transmission solutions based on modular multilevel converters (MMC-HVDC) provide an attractive set of operational benefits compared to traditional ac grid enforcement [1]. If full-bridge (FB) or comparable submodule topologies are utilised, dc side contingencies can be handled actively by using controls. This avoids blocking (converter passivation) and enables continuing in-feed of reactive power (STATCOM) into the connected ac network. To supplement available literature mainly dealing with dc fault current interruption (FCI) and restart procedures [2, 3], this work focuses on protection scheme design and threshold determination to obtain high selectivity.
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