Gate-controlled series compensator on gate-controlled power semiconductor devices

Characteristics of a nonreactor series compensator (NRSC) based on a gate-controlled power semiconductor for the production of flexible (controlled) AC power lines are considered. Analytical solutions of the transient equation on the commutation of gate switching in an NRSC circuit for steady-state processes are obtained. The forms of currents and voltages in the NRSC circuit are analyzed. The dependence of the equivalent impedance of NRSC on the commutation delay angle of gate control and its effect on the degree of compensation for an electric power line (EPL) are determined. A comparison of the characteristics of an NRSC and a thyristor-controlled series compensator (TCSC) is performed. Estimation of the maximum switching frequency of an NRSC is given; the effect of an NRSC on the distortion of the curves of currents and voltages in EPLs is shown. © 2008 Allerton Press, Inc.