Voltage pole‐wave protection scheme for multi‐terminal DC grid

Xie, Zhongrun; Zou, Guibin; Gao, Lei; Jie, Zhang; Gao, Houlei

doi:10.1049/joe.2018.8415

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…wileyonlinelibrary.com/iet-gtd 2573 FIGURE 1 The topology of a four-terminal MMC-based DC grid. MMC, modular multi-level converter capacitance of line [22,23]. However, this method has problems such as high requirement for communication transmission, poor sensitivity in the case of high resistance fault, difficult wave head detection, and limited anti-interference capability etc.…”

Section: Introductionmentioning

confidence: 99%

“…Pilot travelling wave protection uses information such as the direction and amplitude of fault transient travelling wave to form the protection criterion. It is capable of fast operation and is not affected by the distributed capacitance of line [22, 23]. However, this method has problems such as high requirement for communication transmission, poor sensitivity in the case of high resistance fault, difficult wave head detection, and limited anti‐interference capability etc.…”

Section: Introductionmentioning

confidence: 99%

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A new pilot protection scheme for modular multi‐level converter‐based HVDC system based on voltage matching factor

Xiao

et al. 2022

IET Generation Trans & Dist

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Concerning the incorrect operation of line protection in modular multi-level converterbased multi-terminal DC system, a pilot protection method based on voltage matching factor is proposed. First, the dynamic switching process of flexible DC converter submodule is analyzed, and the expression of DC voltage of converter station considering the influence of alternating current (AC) system is derived. On this basis, the model of DC line voltage considering the influence of AC injection current is built, and the equivalent DC line voltage is calculated according to the voltage model. Then, by constructing the distortion factor which reflects the difference between the equivalent DC line voltage and actual DC line voltage, the protection criterion for the identification of internal and external faults is established. Finally, simulation tests on real time laboratory (RT-LAB) platform verify that the proposed scheme can correctly distinguish between internal and external faults in different fault cases, with fast operation speed and strong immunity to the fault resistance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%