The limitation of AGC centralized control strategy is that it requires the exchange of information from control areas spread over distantly connected geographical areas along with their increased computational and storage complexities. In the early era, the AGC strategies were proposed base on centralized control strategy (Quazza 1966 Elgerd & Fosha 1970 Aldeen & Trinh 1994 Fosha & Elgerd 1970). A large number of control techniques have been proposed by the researchers for the design of AGC regulators. The automatic generations control of interconnected power systems has become more significant as size and complexity of the system is going on increasing to meet out power demand. In modern interconnected power system, automatic generation control (AGC) is used to maintain the system frequencies and tie-line power flows at the specified nominal values. If the input-output power balance is not maintained, a change in frequency will occur which it highly undesirable. A modern power system is divided into a number of control areas and each area is responsible for its own load and power interchanges. And it is achieved by controlling of real and reactive powers. To provide a good quality of power, the operation of power system must be maintained at the nominal frequency and voltage profile.
The two power system areas may be connected through synchronous/asynchronous tie-lines. The interconnection of the power systems enhance the stability and become a viable tool to provide the almost uninterruptible power to load canters from generating stations. Modern Power system consists of large number of generating units interconnected by transmission lines.
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