Open AccessSingle‐ended line protection for MMC‐MTDC grids
Author(s) -
Zhang Shuo,
Zou Guibin,
Huang Qiang,
Xu Bin,
Li Jun
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.6903
Subject(s) - fault (geology) , line (geometry) , grid , voltage , inductor , series (stratigraphy) , modular design , control theory (sociology) , sequence (biology) , topology (electrical circuits) , terminal (telecommunication) , computer science , electronic engineering , engineering , electrical engineering , mathematics , telecommunications , chemistry , geometry , paleontology , biochemistry , control (management) , artificial intelligence , seismology , biology , geology , operating system
This study proposes a novel non‐unit line protection for modular multilevel converter‐based (MMC) multi‐terminal high‐voltage direct current (MTDC) grids. On the basis of the symmetrical component analysis, the initial values of positive‐sequence voltage travelling waves (PSVTWs) generated by the fault are first investigated. Then, according to the TW theory and the inherent composition of the primary equipment of MMC‐MTDC grids, the initial values of PSVTWs on both sides of the series inductor are obtained in Laplace domain. Moreover, a fast fault line protection based on the positive‐sequence voltage on the series inductor at the line terminal is proposed. Besides, the method of the protection threshold determination is elaborated and is independent of simulation. Finally, extensive simulation studies are carried out in a four‐terminal MMC‐MTDC grid. Simulation results show the effectiveness of the proposed line protection method.