Due to transients there are some instabilities in a power system due to which load and generation will be imbalanced. For keeping
the above balance the tie-line flow and frequency are controlled using prime mover governing system. It is known as AUTOMATIC
GENE RATION CONTROL.
This has very important role in transients and also during normal operating conditions. During operation, AGC provides zero error
in steady state and frequency is maintained within limits and can distribute the load equally on neighbouring units and also the
power flow between the interconnected system is controlled
For an interconnected system, in order to get smooth operation all the above objectives should have to be achieved. The power flow
between the interconnected systems and frequency control is constituted by AGC. There are so many control theories.
For obtaining optimal values for the parameters of controller, optimization techniques are developed such as evolutionary
computational technique.
