Design of fuzzy-PID controller with derivative filter and its application using firefly algorithm to automatic generation control

In this study we introduced a heuristic and powerful optimization technique called firefly algorithm to tune the coefficients of fuzzy-PID controller along with derivative filter (FPIDF) for the frequency control of a unified power system with thermal non-reheat type turbine. The response of system is observed under Step Load Perturbation (SLP) of 10% in area 1. The frequency stability analysis is carried on two phases. In the first case the system responses are analyzed by giving a perturbation of 10% in area 1 and in later case the system load is increased by 10% for verifying its robustness. The dynamic response of the FPIDF controllers are observed in terms of minimum undershoots, settling time and maximum overshoots. Further the results obtained by this established method are also compared with those of Bacteria Foraging Optimization (BFO) tuned PI controller and Hybrid BFO-PSO tuned PI controller which are published in previous journals.