FUNDAMENTAL ANALYSIS OF DYNAMIC STABILITY IN SUPERCONDUCTIVE POWER-SYSTEMS

Applications of superconductivity to power systems have many possible advantages in economy, reliability and stability. On the other side, superconductive power systems have risks of including insufficient damping due to the effect of inductance-capacitance (LC) resonance. This may cause subsynchronous resonance oscillations (SSR) represented by self-excited oscillation and torsional oscillation of rotor-turbine shafts. The main subject of this paper is to analyze numerically SSR and electro-mechanical power swing in a model power system with superconductive power apparatus. A stabilizing control scheme which uses the stored energy in the field winding circuit of superconductive generator, is applied to some instabilities and its effectiveness is confirmed in a digital simulation study.