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.
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.
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.
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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