Optimized Type-2 Fuzzy Logic Controller for Load-Frequency Control in Multi-Area Power Systems Using the HBB-BC Algorithm

In this paper, an optimizedType-2 fuzzy logic controller (T2FLC) is developed for load-frequency control (LFC) of multi-area interconnected power systems. In particular, theproposed controller employs the Hybrid Big Bang-Big Crunch (HBB-BC) algorithm to optimize the membership functions, which considers system uncertainties and nonlinearities. Thecomparison results under two different load disturbances using simulation show that the optimized T2FLC is superior in frequency oscillation and transmission line poweras compared to conventional PI, PID, and Type-1 fuzzy controllers. The settling time is reduced by 40% and the frequency fluctuation amplitude is decreased by 70% compared to the PI controller; the ITAE is the lowest, indicating that the T2FLC is the bestin terms of damping oscillations and guaranteeing system stability.