Coordinated control of optimized SMES and SFCL for the improvement of power system transient stability

Abstract

In electric power systems, power quality has been one of the issues of increasing interests as it is subjected to variation of load or disturbances induced within the length of the transmission line. For this reason power system stability is of utmost importance. Power system transient instability may result in loss of synchronism. To avoid such problems energy storage becomes essential. Thus to improve stability resistive type Superconducting Fault Current Limiter (SFCL) and Superconducting Magnetic Energy Storage (SMES) can be effectively used. SMES is used to damp the power swing after the occurrence of fault but it requires a large power capacity. Additionally the SMES cannot absorb enough energy during faults since the bus voltage where the SMES is installed, drops considerably. Therefore, to enhance the SMES control effect and transient stability, this project proposes the coordinated control of the optimized resistive type SFCL and SMES. By solving the simultaneous optimization problem of SFCL and SMES, the optimal parameters can be obtained. Thus with the help of these optimal parameters, it can be proved that the performance with optimized parameters is superior when compared to non optimal units.