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Journal of Power and Energy Engineering, 2014, 2, 312-333 Published Online April 2014 in SciRes. /journal/jpee /10.4236/jpee.2014.24043 Automatic Generation Control of Multigeneration Power System Asma Aziz, Amanullah Mto, Alex Stojsevski Faculty of Science, Engineering and Built Environment Deakin University Geelong, Geelong, Australia Email: aazi@.au Received February 2014 Abstract Load frequency Control (LFC) is used for many years as part of Automatic Generation Control (AGC) in power system around the world. In a mixed power system, it is usual to find an area regulated by hydro generation interconnected to another area regulated by thermal generation or in com- bination of both. In the following study, performance of AGC for Thermal, Hydro and Thermal tur- bine based power system is examined, including how frequency bias setting influences AGC re- sponse and inadvertent interchange. Control performance analysis of three area interconnected systems is simulated and studied through Matlab Simulink software. Integral square error and Integral time absolute error has been used as performance criterion. It is shown that integral time absolute error (ITAE) as performance index leads to faster optimization of controller gain. Keywords Automatic Generation Control; Performance Index; ISE; ITAE; Discrete Controller 1. Introduction Today’s power system consists of control areas with many generating units with outputs that must be set ac- cording to economics. The analysis and design of Automatic Generation Control (AGC) system of individual generator eventually controlling large interconnections between different control areas play a vital role in auto- mation of power system. The purposes of AG