Using D-SMES devices to improve the voltage stability of a transmission system

The D-SMES device, a combination of a superconducting magnet energy storage (SMES) system with a voltage-source IGBT converter, is capable of fast, effectively controlled, and near instantaneous injection of both real and reactive power into a transmission system. Described are results of voltage stability studies for an actual transmission system with up to seven 8 MVA D-SMES devices, each utilizing 3 MJ magnets, placed at different buses. The study was performed using a new D-SMES device PSS/E model. Shown is effectiveness of using D-SMES devices in actual systems to help utilities improve voltage stability and prevent voltage collapse.