6-14
6-3-2 PID Control Operation
·Tosimply explain the operation ofproportional control, integral control, andderivative
control, the following graph is used to show that the output frequency changes while
thedeviation(i.e.,thedifferencebetweenthetarget valueandfeedbackvalue) iscon-
stant.
Deviation
Control
value
Time
PID control
Integral
(I) control
Derivative
(D) control
Proportional (P)
control
Time
·Proportional (P) Control: The output is in proportion to the deviation. The deviation
cannot be set to 0 with proportional control only.
·Integral (I) Control: The output is the integral value of the deviation. This control
methodmakesthefeedbackvaluecoincidewiththetargetvalueeffectivelybutcannot
catch up with a rapid change in deviation.
·Derivative(D)Control:Theoutputisthederivativevalueofthedeviation.Thiscontrol
method quickly responds to a rapid change in deviation.
·PID Control: By combining the merits of the above control functions, ideal control is
possible.
6-3-3 Types of PID Control
·Two types of PID control are available to the 3G3MV Inverter. Normally, feedback-
value integral PID control is used.
Advanced Operation Chapter 6
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