(in lingua inglese)
In this paper, an attempt has been made for the first time to apply a hybrid Differential Evolution (DE) and Pattern Search (PS) optimized Modified Integral Derivative (MID) controller for load frequency control of multi-area multisource power system in deregulated environment. The Boiler dynamics, Generation Rate Constraint (GRC) and Governor Dead Band (GDB) have been considered to have a more realistic power system. The system has been investigated all possible of power transactions that take place under deregulated environment. The proposed hybrid technique takes advantage of global exploration capabilities of DE and local exploitation capability of PS.