S
ection
5
PID DATA
MARATHON-DVR2000E-32 enables generator stability to be set through the automatic calculation of PID
parameters. PID stands for Proportional, Integral, Derivative. The word proportional means that the response of
the DVR2000E output is proportional or relative to the amount of change that is observed. Integral means that
the DVR2000E output is proportional to the amount of time that a change is observed. Integral action eliminates
offset. Derivative means that the DVR2000E output is proportional to the required rate of excitation change.
Derivative action avoids excitation overshoot.
MARATHON-DVR2000E-32 automatically calculates PID values after the user selects the generator frequency,
generator time constant (T’do), and exciter time constant (Texc). With MARATHON-DVR2000E-32, the user may
generate new PID numbers, add to a PID list le, and update the AVR gain settings.
The PID window (Figure 5-24) is accessed by clicking the PID button. The PID button can be clicked only when
the Stability Range setting of the Control Gain screen is set at a value of 21. (A setting of 21 enables the entry of
custom stability settings through the PID window.) Then, when a eld of the Control Gain screen is changed or
selected, the PID button changes from gray to yellow and the button can be clicked to view the PID window. After
the PID numbers are modied, calculated, and updated, the PID window is closed by clicking the Update Setting
Screen button. The modied PID values are then shown on the Control Gain screen.
Figure 5-24. PID Window
PID Calculation Based on Input Values
The available range for the exciter time constant depends on the value entered for the generator time constant.
(The default value for the exciter time constant is the generator time constant divided by 6.) The generator time
constant value selected must be in the range of 1.00 to 15.00 seconds and in 0.05 increments. When the generator
time constant value is 1.00, the available exciter time constant range is 0.03 to 0.50 in 0.01 second increments.
When the generator time constant value is 15.00, the available exciter time constant range is 0.30 to 3.00 in 0.01
second increments.
For example, when T’do is set at 2.0 seconds, Texc is 0.33. After specifying the input values, a set of PID
parameters (output data) is generated automatically. If T’do is set at 5.00 seconds, then Texc is 0.83 seconds. The
calculated KP is 155.47, KI is 138.72, KD is 48, and Kg is 1.
PID parameters can be directly removed from, added to, or modied in the PID List Data. PID parameters may
also be saved into a le (pidlist.dat).
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Section 5 Index
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