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Chapter: Power System Operation and Control - Real Power Frequency Control

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.

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 response.

 

It has been proved that


For a step load change of magnitude k


Neglecting the governor action and turbine dynamics

 





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