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For example, please view the picture bellow:
Figure 3 – Digital input
PI CONTROLLER
The digital control block is show in figure bellow:
The controller used by the GRTD-TH3 voltage regulator is a PI control. The adjustment of the two
parameters that are the proportional gains KP, integral KI, are performed through the stability
potentiometer. The calculation cycle of the control is connected to the operating frequency of the
machine.
The purpose of the controller is to maintain the null error, the difference between the measured
voltage (negative terminal of figure 4) and the reference (positive terminal) equals zero. When
perceived a variation in the error it compensates increasing or reducing the output of the controller
with response dependent of the adjusted gains. The figure 5 exemplifies some typical controller
responses by varying the settings and the controlled system (generators).
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