DYNAMIC RESPONSE OF LOAD
FREQUENCY CONTROL LOOPS
Ø It has been shown that the load frequency
control system posses inherently steady state error for a step input.
Ø 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.
Ø For this purpose considering the relatively
larger time constant of the power system the governor action can be neglected,
treating it as instantaneous action.
Ø Further the turbine generator dynamics also may
be neglected at the first instant to derive a simple expression for the time
It has been proved that
For a step load change of magnitude k
Neglecting the governor action and turbine