Open AccessContribution of travelling wave propagation time to the speed of optical link protections in multi‐terminal high‐voltage DC systems
Author(s) -
Johannesson Niclas,
Norrga Staffan
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.2019.0344
Subject(s) - fault (geology) , computer science , terminal (telecommunication) , process (computing) , propagation delay , fault detection and isolation , electronic engineering , line (geometry) , circuit breaker , telecommunications , electrical engineering , real time computing , engineering , computer network , actuator , geometry , mathematics , seismology , geology , operating system
During faults in multi‐terminal high‐voltage DC systems, the disturbance will quickly become evident throughout the entire system. If DC breakers are included in such systems, the entire fault clearing process needs to occur within a few milliseconds. Therefore, DC line protection schemes based on telecommunication have previously been discarded by some authors as their performance is constrained by the communication delay. However, telecommunication‐based detection methods offer some very favourable features, one being that selectivity can be achieved without coordination of settings. In this study, several telecommunication‐based protection schemes are evaluated with regards to their minimum possible detection time when considering telecommunication delay. It is shown that they perform best during faults located at the remote end of a line, i.e. fault locations that are difficult to reliably detect using single‐ended methods. Therefore, it is reasonable that the most reliable protection system will consist of both single‐ended and communication‐based methods because they complement each other well. Furthermore, it is shown that the travelling wave differential protection offers the shortest theoretical detection time due to the wave propagation delay being included in the formulation.