1. GTO-CSC as Component of Reactive Power Compensator in an
EHV Transmission Lines Model
Syamsir Abduh
Electrical Engineering Department, Trisakti University, Jakarta
E-mail : syamsir@trisakti.ac.id;the_abduh@hotmail.com
Phone/Fax : 021-5663232 Ext. 421/021-5605841
Abstract
Series compensation of long distance EHV transmission lines has been used to compensate longitudinal voltage
drop, increase stability margins, and control load shaping between parallel transmission path. Recently, several
methods of thyristor controlled series compensation have been proposed. The excellent performance of switching
and fast stepping of power semiconductor devices technology at present time, have bridged the phenomenon of
dependence between optimizing the EHV transmission line utilization and reactive power compensation control
using series capacitor, more flexible. One of power semiconductor devices whose the function as the bridge is Gate
Turn Off (GTO) Thysristor. This paper discussion the operation principle of series compensation with controlled by
GTO, it’s called GTO-CSC. Performance of GTO-CSC in supplying reactive power will be shown by calculating
simulation in a model of EHV transmission line single phase-short line, through designed by mathematical equation.
The result of simulations will displayed in graphics that programmed by MATHCAD. The result of analysis in
resistive-inductive and pure inductive loading explain the ability of GTO-CSC to provide a fast, continues, and
smooth compensation of transmission line series inductance. It can be said like that because GTO is easy to turn-on
and turn-off every half cycle, so GTO-CSC has capability to respond for various load conditions in vary capacitance
level more accurately.
Keywords: GTO-CSC, series compensation, EHV line transmission