Samira Khakpour - Student of Electrical Engineering, Master of Science, Islamic Azad University of Ardebil
Davar Mirabbasi - Instructor at Electrical department of Islamic Azad University of Ardebil

This paper investigates the AGC of a two-area power system composed of two interconnected thermal power plants in a deregulated environment. With existence of Electrical industry deregulation, the AGC system has been considered by taking the effect of bilateral contracts into account; it means that any DISCO may have contracts with any GENCO in other areas. In this research the effect of classic controllers such as Integral (I), Proportional - Integral (PI), Proportional – Integral – Derivative (PID) and Proportional – Integral – double Derivative (PIDD) controllers are also investigated and compared with each other. The investigations show that PIDD controller has a better dynamic response than the other controllers in the same case study.

Automatic Generation Control, two-area power system, deregulated environment, classic controllers, PIDD controller