In this paper, a non-linear control scheme for the TCSC (thyristor-controll
ed series compensator) to dampen power oscillations and to improve the tran
sient stability of power systems is presented. Based on an one-machine-infi
nite-bus system, a non-linear mathematical model is established which is pr
oven as an affine non-linear system. With the help of the feedback lineariz
ation technique, the affine non-linear model is exactly transferred to a li
near model, and then the control scheme is designed for the TCSC based on t
he global linearization, where the input signal uses local measurements onl
y. The effectiveness and robustness of the proposed non-linear control sche
me are demonstrated with one-machine test system, where the TCSC modeling a
nd power system simulations are performed by using the program system NETOM
AC. In comparison with a conventional control scheme, significant improveme
nts of dynamical performance in the test power system are achieved by the p
roposed non-linear control strategy for the TCSC.