A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent p...

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Bibliographic Details
Published inApplied sciences Vol. 9; no. 9; p. 1737
Main Authors Jiang, Bin, Gong, Yanfeng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2019
Subjects
Alternative energy sources
Converters
Equivalent circuits
fault current limiter (FCL)
modular multilevel converter (MMC)
Overcurrent
Power lines
Power supplies
reclosing current limiting resistance (RCLR)
reclosing process
Renewable resources
Short circuits
short-circuit current calculation
Beijing China
China
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Summary:A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9091737