#6. Fuzzy Logic Controller For Fault Current Limiter

This paper proposed a fuzzy logic controlled bridge type fault current limiter (FCL) to enhance the transient stability of multi-machine power systems. The transient stability performance of the fuzzy logic controlled bridge type FCL was compared with that of another static nonlinear controlled bridge type FCL. The total kinetic energy (TKE) of the generators in the system was used to determine the transient stability enhancement index. Also, the critical clearing time was presented as a stability limit. Instead of conventional reclosing, the optimal reclosing of circuit breakers was considered. Simulations were performed by using the Matlab/Simulink software. Simulation results of both permanent and temporary faults at different points of the IEEE 30 bus power system indicated that the fuzzy logic controlled bridge type FCL can enhance the transient stability of the system well. Also, the performance of the proposed fuzzy logic controller was better than that of the static nonlinear controller.

That work was published in IEEE Transactions on Power Systems.

Figure: Bridge Type Fault Current Limiter

Figure: IEEE 30 bus power system with bridge type FCL.

Figure: Fuzzy logic controller connection scheme to the bridge type FCL.

Figure: Total kinetic energy response for 3LG permanent fault at position I.