Open AccessIncorporating inductor‐capacitor branch for thyristor‐based DC fault current interruption
Author(s) -
Taha Ibrahim B.M.,
Mosaad Mohamed I.,
Ashmawy Mohamed G.
Publication year - 2020
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/2050-7038.12197
Subject(s) - thyristor , inductor , fault (geology) , integrated gate commutated thyristor , mos controlled thyristor , capacitor , fault current limiter , current (fluid) , electrical engineering , control theory (sociology) , computer science , electronic engineering , engineering , power (physics) , electric power system , voltage , physics , control (management) , quantum mechanics , artificial intelligence , seismology , geology
Summary This paper investigates the interruption capability with the aid of a parallel capacitor branch and exploits the single current direction through a series thyristor with the DC system. Two DC current interruptions are introduced by providing superimposed oscillatory currents. The first one is that the capacitor branch (capacitor and inductor) is continuously connected in parallel with the system where the capacitor is charged from the system during the normal operation. Due to fault occurrence, the capacitor branch including an inductor produces an oscillatory current that can make zero crossing through the series thyristor. However, the interrupting current is unfortunately after the second oscillatory peak current that the fault resistance can damp the oscillatory current. By changing the charged capacitor polarity, the second breaking concept is introduced depending on a precharged capacitor by the system voltage and then injecting the oscillatory current using a self‐triggered additional thyristor. The current interruption initiation is attained using the DC current raising. The interruption performance is evaluated using a thyristor‐based converter DC system.