Design discrete controller for zero steady state error

1. What type of controller is recommended for obtaining zero steady-state error?
2. How do you make steady-state error zero?
3. Which controller has steady-state error?

What type of controller is recommended for obtaining zero steady-state error?

P-I controller is mainly used to eliminate the steady state error resulting from P controller. However, in terms of the speed of the response and overall stability of the system, it has a negative impact. This controller is mostly used in areas where speed of the system is not an issue.

How do you make steady-state error zero?

In general, the steady-state error will be zero if there is at least one pure integrator in the forward path of a unity feedback control system with a step input, but a different form of input will give an error.

Which controller has steady-state error?

Steady State Error & PI Controllers – Effect of PI Controller on Steady State Error. A steady-state error is defined as the difference between the desired value and the actual value of a system output when the response has reached the steady state.