Research of fuzzy logic-controlled smes for power system transient voltage stability

Superconducting Magnetic Energy Storage (SMES) is a power electronic based device with a superconducting coil that has the potential to bring essential functional characteristics to the utility transmission and distribution systems. This paper presents a new approach and corresponding experiments for fuzzy logic-controlled SMES to improve the transient voltage stability of electric power system. The SMES coil built for power utility applications has the following unique design characteristics: 0.2 H, 20 kW/100 kJ, 1 kA dc current. Based on the result of SMES prototype experience, a mathematic model of power system and SMES are adopted. A fuzzy controller is assigned. Bus voltage is taken as the input signal to fuzzy controller. The fuzzy rule-bases are designed and explained. The validity of the suggested control strategies are confirmed by simulation and experimental tests. From the results they are demonstrated that transient voltage stabilizing effect by mean of SMES was very significant.