Analysis and Performance Comparison of Resonance-Based Fault Current Limiters for Transient Stability in Steam Turbine Generators

This paper presents a comprehensive evaluation of resonance-based Fault Current Limiters (FCLs) to enhance the transient stability of steam turbine-based synchronous generators during fault events. Various FCL configurations were analyzed under symmetrical fault conditions using MATLAB/Simulink simulations. The results demonstrate that the SRRFCL consistently outperformed other configurations, achieving superior fault current limitation, minimal oscillations, and rapid stabilization across key system parameters, such as voltage, power, rotor speed, and torque. While SPRFCL and PRFCL offered moderate improvements over the SRFCL and the non-protected system, their recovery times and transient oscillations were less optimal. The Dual SPRFCL and SRFCL exhibited the least stability, with significant deviations and prolonged recovery times. These findings highlight the critical role of resonant-based FCL designs in maintaining system reliability and mitigating transient instability in modern power systems. Future research should focus on optimizing FCL designs to balance performance, cost, and implementation complexity.