This paper deals with the automatic generation control of a two area interconnected multi source power system using PID controller optimized by Hybrid DEPSO algorithm. Here in each area three types of of sources are being considered namely thermal, hydro and gas power plant. The system performance is analyzed with and without HVDC link. The gains of PID controllers are optimized considering integral time absolute error (ITAE). The dynamic response of the system is analyzed in terms of settling time, peak overshoot and peak undershoot by giving step load perturbation (SLP) in area 1. Further the result of proposed work is also compared with recently published result in order to show the supremacy of the proposed method.