hyGWO-PS Tuned FOPID for AGC of Three Area Interconnected Hydro-Thermal Power System

In the present work, the application of a mixed/hybrid algorithm: grey wolf optimization-pattern search (hyGWO-PS) has been elaborated for automatic generation control (AGC) of three area interconnected hydro-thermal power system. The fractional-order proportional-integral-derivative (FOPID) controller has been incorporated in each area of the investigated power system and controllers’ parameters have been tuned/optimized using the hyGWO-PS algorithm. For this purpose, a constrained control optimization problem has been defined with minimum and maximum ranges of controllers’ parameters in which objective function: integral of time multiplied absolute error (ITAE) is minimized. The application of hyGWO-PS algorithm to tune the controllers’ parameters for the same is abbreviated as hyGWO-PS/FOPID approach. The results carried out using the proposed approach for the investigated system have also been compared with some existing approaches and the results reveal that the proposed approach: hyGWO-PS/FOPID for the aforesaid power system produces the better performance in terms of ITAE, settling times/peak overshoots, number of oscillations and speed of frequency and tie line power deviations while comparing with some other approaches in the literature. The percentage reduction in ITAE, settling times, and overshoots with respect to other techniques have also been evaluated which shows the improvement in aforesaid parameters with respect to other existing techniques.