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Full selective protection strategy for multi-terminal cable HVDC grids based on HB-MMC converters

Abstract : In a near future, multi-terminal High Voltage Direct Current grids (MT-HVDC grids) appear to be a suitable solution for the integration of power electricity produced by remote offshore windfarms into the AC transmission system. Though the recourse to HVDC point-to-point links is well-known, challenges still remain for a safe operation of HVDC grids. Protection is the main technical field still under study and reliable protection strategies ensuring the best technological and economic ratio are investigated. This thesis focused on a full selective protection philosophy similar to the one applied to AC transmission systems. The consideration of cable links, Half-Bridge VSC-MMC converters and hybrid DC circuit breakers defines the frame of the study. An association of two algorithms for the identification of faults is suggested. The time available for the fault clearing process has been investigated. Simulations performed with EMTP software have been used to evaluate the reliability of the suggested strategy.
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Submitted on : Wednesday, February 28, 2018 - 12:07:07 PM
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  • HAL Id : tel-01719612, version 1

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Geoffrey Auran. Full selective protection strategy for multi-terminal cable HVDC grids based on HB-MMC converters. Electric power. Université Grenoble Alpes, 2017. English. ⟨NNT : 2017GREAT060⟩. ⟨tel-01719612⟩

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