DYNAMIC RESPONSE OF LOAD FREQUENCY CONTROL LOOPS

·         It has been shown that the load frequency control system posses inherently steady state error for a step input.

·         Applying the usual procedure, the dynamic response of the control loop can be evaluated so that the initial response also can be seen for any overshoot.

·         For this purpose considering the relatively larger time constant of the power system the governor action can be neglected, treating it as instantaneous action.

·         Further the turbine generator dynamics also may be neglected at the first instant to derive a simple expression for the time response.

It has been proved that

For a step load change of magnitude k

Neglecting the governor action and turbine dynamics