Compensator (control theory)
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.
Adjusting a control system in order to improve its performance might lead to unexpected behaviour. In order to make the system behave as desired, it is necessary to redesign the system and add a compensator, a device which compensates for the deficient performance of the original system.
