[IEEE 2014 International Conference on Circuit, Power and Computing Technologies (ICCPCT) - Nagercoil, Tamil Nadu, India (2014.3.20-2014.3.21)] 2014 International Conference on Circuits, Power and Computing Technologies [ICCPCT-2014] - Application of hybrid DEPSO algorithm to study the performance of different PID controller structures for automatic generation control of a two-area multi-units interconnected power system