Chapter: Power System Operation and Control : Reactive Power -Voltage Control
Steady State Performance Evaluation
STEADY STATE PERFORMANCE EVALUATION
The control loop must regulate the output voltage VI so that the
error is made equal to zero. It is also imperative that the response must be
reasonably fast, yet not cause any instability problem.
The performance of the AVR loop is measured by its ability to
regulate the terminal voltage of the generator within prescribed static
accuracy limit with an acceptable speed of response. Suppose the static
accuracy limit is denoted by Ac in percentage with reference to the nominal
value.
The error voltage is to be less than (Ac/100)∆|V|ref.
From the block diagram, for a steady state error voltage ∆e;
Larger the overall gain of the forward block gain K smaller is the
steady state error. But too large a gain K cans instability
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