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Bypass arm based DC fault isolation scheme for MMC-HVDC systems

Wang, Yaoqiang, Sun, Ruyin, Guo, Yanxun, Wang, Kewen and Liang, Jun ORCID: 2023. Bypass arm based DC fault isolation scheme for MMC-HVDC systems. Journal of power electronics 23 , pp. 1232-1242. 10.1007/s43236-023-00618-y

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High voltage direct current transmission based on a modular multilevel converter (MMC-HVDC) is an effective method to solve the grid connection of the new energy. A DC fault is an issue that must be solved for MMC-HVDC. This paper proposes a protection scheme for HVDC converters to quickly suppress DC fault current without increasing the operation loss. By employing a bypass arm in conjunction with a switch-type zero-loss current limiter (SZCL), most of the DC current in the bridge arm flows through the bypass arm so the fault current of the power devices is reduced. There are a number of main advantages of this scheme. The fault isolation time can be greatly shortened, the cost of the system is effectively reduced, the steady-state operation loss of the system does not increase, the operation of the AC-grid can be maintained stably when a DC fault occurs, and the overcurrent impulse to the AC-grid is reduced. The proposed scheme is applicable to two-terminal systems and the DC grid, especially for faults at the converter outlet of the DC grid. Simulation results using PSCAD/EMTDC show the superiority of the proposed scheme when compared with other schemes and a comparison of the costs shows the feasibility of the proposed scheme in practical applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Springer
ISSN: 1598-2092
Date of First Compliant Deposit: 6 April 2023
Date of Acceptance: 14 February 2023
Last Modified: 14 Feb 2024 17:05

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