What is the function of compensator?

Unsourced material may be challenged and removed. A compensator is a component in the control system and it is used to regulate another system. In most of the time, it is done by conditioning the input or the output to that system. There are three types of compensators: lag, lead and lag-lead compensators.

What are effects of compensator in frequency response?

The lead compensator increases the gain of the system at high frequencies (the amount of this gain is equal to a). This can increase the crossover frequency, which will help to decrease the rise time and settling time of the system (but may amplify high frequency noise).

What is compensator and why it is required?

Compensator is used in the control system to improve system dynamics, improve characteristics of the open loop system, and improve stability. The lead/lag compensator, phase compensator is used to improve the stability of the system.

How are phase lead compensators used in frequency response?

In frequency response design, the phase-lead compensator adds positive phase to the system over the frequency range 1 / aT to 1 / T. A Bode plot of a phase-lead compensator C ( s) has the following form. The two corner frequencies are at 1 / aT and 1 / T; note the positive phase that is added to the system between these two frequencies.

How is phase lag compensation used in frequency response design?

Phase-Lag Compensation In the frequency response design, the phase-lag compensator serves a dual purpose: it can improve the phase margin (a measure of transient response), as well the DC gain (a measure of steady-state response). The phase-lag compensator is described as:

What is the slope of a frequency response design?

A mild slope of − 1 (or − 20dB / decade) at the crossover. The choice of compensators in the frequency response design method includes the gain compensator, the phase-lag and phase-lead compensators, and the PD, PI, and PID compensators. These are described next.

How are lead and lag compensators used in control?

Lag or phase-lag compensator using frequency response Lead-lag compensator using either root locus or frequency response Lead and lag compensators are used quite extensively in control. A lead compensator can increase the stability or speed of reponse of a system; a lag compensator can reduce (but not eliminate) the steady-state error.