Improving Controllability of Flexible Transmission Lines With Series Compensation

Abstract

This study is focused on application of controlled devices of series and shunt compensation to improve the characteristics of operating conditions and level of small-signal stability. Analysis of steady-state operations of long-distance AC transmission line with determination of the maximum transmitted power at various control parameters of SVC, TCSC and generator PSS is carried out. Investigation of small-signal stability of long-distance transmission line is performed in wide range of operating conditions from zero to surge impedance loading. Simultaneous coordination of control system parameters is proposed under consideration to ensure maximum oscillation damping. It is noted that application of controlled compensation devices and correct adjustment of control system make it possible to increase the stability characteristics of the power system significantly.