Optimal Control of Electrical Power Systems Containing Controlled Reactors Part 1: Effect of Controlled Reactors on the Transient Stability Limit

This paper considers the effect of controlled reactors connected to an EHV long transmission line on the transient stability power transfer limit of the system. It is shown that this effect may be substantial and depends on the parameters of the controlled reactors themselves (time constant and control range) as well as on the degree of series capacitive compensation and the prefault operating conditions of the line. The optimum values of the controlled reactor parameters under transient conditions have been determined. The results obtained provide a good basis to continue the study to show the damping effect of the controlled reactors in case of large disturbances in the system.