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

This paper deals with design and analysis of automatic generation control (AGC) of a two area four unit interconnected thermal power system. Three different structures of proportional integral-derivative (PID) controller are used to study the transient response of the proposed system. Areal consists of two thermal generating units with reheat turbines and area2 has two thermal generating units with non-reheat turbines. The gains of PID controllers are optimized by using a novel hybrid Differential Evolution-Particle Swarm Optimization (DEPSO) technique. Step load perturbation (SLP) of 1 % is applied in areal to study the performance of different structures of PID controllers. Finally it is observed that the 3^rd PID controller configuration performs better than the other two.