Coordinated control of UPFC with SMES and SFCL for improvement of power system transient stability

摘要

System stability and protection from any disturbances are significant problems in power system especially in a distribution system with dispersed generation. Superconductivity is expected to be a powerful controller to stabilize and protect the power systems. SMES is effective to damp the power swing Improvement transient stability SMES not able to absorb enough energy during fault. In order to enhance the control effect of SMES resistive type SFCL is installed appropriately. The optimal parameter of SFCL & SMES can be automatically obtained. UPFC is used to smooth out the power output. UPFC (Unified Power Flow Controller) is the most powerful FACTS devices, it can vary the parameter values independent so that it can control the power flow. Superconducting Magnetic Energy Storage (SMES) is effective to damp the power swing after the occurrence of faults. To enhance the SMES control effect and transient stability, this project proposes the coordinated control of the optimized resistive type superconducting fault current limiter (SFCL) inconpereted with active part UPFC, SMES acts as the storage device. Since the stored energy of the capacitor is limited, it can only continuously inject into the system or absorb reactive power from the system, but to provide active power compensation for a long time Super conductor magnetic storage system (SMES) was applied. The system are simulated in Matlab Simulink platform and appreciable results are obtained.