16-2 9440300990
Stability Tuning DECS-250
Figure 16-1. AVR Stability Settings
PID Calculator
The PID calculator is accessed by clicking the PID calculator button (Figure 16-1) and is available only
when the primary gain option is “Custom”. The PID calculator (Figure 16-2) calculates the gain
parameters K
p
, K
i
, and K
d
based on the generator time constants (T’do) and exciter time constant (T
e
). If
the exciter time constant is not known, it can be forced to the default value which is the generator time
constant divided by six. A derivative time constant (T
d
) setting field enables the removal of noise effects
on numerical differentiation. A voltage regulator gain (K
a
) setting field sets the voltage regulator gain level
of the PID algorithm. Calculated and entered parameters can be applied upon closure of the PID
calculator.
Generator information appears in the PID Record List where records can be added or removed.
A group of settings can be saved with a unique name and added to a list of gain setting records available
for application. Upon completion of stability tuning, undesired records can be removed from the record
list.
Calculated or user-defined PID values are to be implemented only
after their suitability for the application has been verified by the user.
Incorrect PID numbers can result in poor system performance or
equipment damage.
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