Transient energy dissipation and damping improvement using STATCOM & SSSC

In large power systems the generators are of generally synchronous type, so it is necessary to maintain synchronism with the grid in order to provide standard service to consumer. The disturbance in power system is mainly due to sudden change of heavy load, faults, and loss of excitation. In this paper, the rate of change of transient energy of the system is taken into account i.e. the dissipation of kinetic energy (K.E.) of the power system due to disturbances as a measure of system damping. To provide additional damping in the power system without additional cost, the output power of the FACTS devices like STATCOM and SSSC already connected in the power system for compensation is used. They modulate the system output, so as to reduce the system oscillation and hence stability improves.