Fast single-end line protection method for the meshed multi-terminal HVDC grid

The Journal of Engineering

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[1] State Grid Weihai Electric Power Company, Weihai, People's Republic of China;The Department of Relaying Protection, School of Electrical Engineering, Shandong University, Jinan, People's Republic of China;

关键词: HVDC power transmission;    power transmission lines;    HVDC power convertors;    power grids;    power transmission protection;    fault diagnosis;    power transmission faults;    current limiting reactors;    short-circuit fault characteristics;    protection technique;    multilevel converter-based HVDC grid;    MMC;    transient voltages;    internal faults;    external faults;    single-end protection scheme;    transition period;    TP;    abrupt changing point;    fault voltage;    four-terminal symmetrical bipolar HVDC grid;    dc transmission line protection method;    fast single-end line protection method;    meshed multiterminal HVDC grid;    current-limiting reactors;    PSCAD;    EMTDC;   

DOI  :  10.1049/joe.2018.8722

来源: publisher

【 摘 要 】

In view of the short-circuit fault characteristics, the protection technique of the dc lines limits the development of the modular multi-level converter (MMC)-based HVDC grid in a large extent. This study derives the calculation formulas of the transient voltages of internal and external faults and proposes a single-end protection scheme based on the transition period (TP) from the abrupt changing point to the first extreme point of the fault voltage. Due to the current-limiting reactors, the TP of the internal fault is much shorter than that of the external fault, which is used to discriminate internal fault from external fault. A four-terminal symmetrical bipolar HVDC grid based on MMC is modelled using PSCAD/EMTDC, and simulation results demonstrate the validity of the new proposed dc transmission line protection method.

【 授权许可】

CC BY