Open AccessProtection principle for MMC‐HVDC DC lines based on boundary signals
Author(s) -
Lv Cheng,
Tai Nengling,
Zheng Xiaodong
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0473
Subject(s) - transient (computer programming) , modular design , fault (geology) , boundary (topology) , computer science , control theory (sociology) , electronic engineering , transmission system , topology (electrical circuits) , transmission (telecommunications) , engineering , electrical engineering , mathematics , control (management) , artificial intelligence , mathematical analysis , seismology , geology , operating system
The protection of modular multilevel converter (MMC) is a research interest in the flexible DC transmission, particularly with the increasing penetration of distributed generators. A 21‐level MMC converter is firstly modelled in PSCAD/EMTDC. Different types of DC fault characteristics are analysed in detail. Based on these transient features, a definition of signal distance is then introduced combining boundary DC currents. Furthermore, based on the difference of boundary signals, a protection principle for MMC‐HVDC DC lines is proposed. Various simulations are carried out in PSCAD/EMTDC on different fault conditions, such as different fault resistances and distances. Finally, the proposed protection principle is tested under different fault types and locations. Simulation results show that the proposed protection principle is feasible and reliable.