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PD controller vs PI controller vs PID controller | Difference between PD controller,PI controller,PID controller

This page compares PD controller vs PI controller vs PID controller and mentions difference between PD controller, PI controller and PID controller.

Definition: The controller is a device which is used in series with plant in order to drive the plant towards decreased output.

PD Controller

PD Controller

Following are the features of PD controller shown in the figure-1.
• Transient response improves.
• Damping ratio increases.
• Peak overshoot decreases.
• Bandwidth increases.
• Noise level increases.
• Improves gain margin, phase margin and resonant peak.

PI Controller

PI Controller

Following are the features of PI controller shown in the figure-2.
• Improves Steady state response.
• Improves type and order of system by one.
• Noise level reduces.
• Increases error constant.
• Bandwidth reduces.

PID Controller

PID Controller

Following are the features of PID controller shown in the figure-3.
• It is similar to lead-lag compensator and band reject filter.
• It improves both steady state as well as transient response.
• It reduces rise time.
• It increases bandwidth.
• It increases stability.
• It eliminates steady state error between input and output.
• It increases type and order of system by one.



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