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Analysis of single-phase-to-ground faults at the valve-side of HB-MMCs in bipolar HVDC systems

Li, Gen, Liang, Jun, Malirat, Fanny, Ugalde Loo, Carlos, Liang, Haifeng and Li, Hui 2017. Analysis of single-phase-to-ground faults at the valve-side of HB-MMCs in bipolar HVDC systems. Presented at: 2017 IEEE Energy Conversion Congress and Exposition (ECCE), Cincinnati, OH, 1-5 October 2017. p. 2659. 10.1109/ECCE.2017.8096501

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Half-bridge (HB) modular multi-level converter (MMC) based bipolar HVDC transmission systems can be employed to transfer bulk power over long distances with high reliability and flexibility. However, this configuration exhibits special fault behaviors that should be taken into account during its design stage. For instance, a single-phase-to-ground fault at the valve-side of the HB-MMCs will lead to overvoltages in the upper arm and high dc components in the fault currents. More importantly, such type of fault currents will bring difficulties for grid side ac circuit breakers to interrupt arcings within the contact parting time. In this paper, such issues are theoretically analyzed in detail. A hybrid MMC using both HB and full-bridge submodules is proposed to solve the aforementioned problems. The proposed solution is verified through simulations performed in PSCAD/EMTDC. The studies in this paper will contribute to the design and protection of MMCs in bipolar HVDC transmission systems for station internal ac grounding faults.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Funders: EU FP7, National Grid, NSF
Last Modified: 23 Jul 2022 08:30

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