The various types of controllers are used to improve the performance of control systems. In this chapter, we will discuss the basic controllers such as the proportional, the derivative and the integral controllers.
Proportional Controller
The proportional controller produces an output, which is proportional to error signal.
Derivative Controller
The derivative controller produces an output, which is derivative of the error signal.
The derivative controller is used to make the unstable control system into a stable one.
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The integral controller is used to decrease the steady state error.
Let us now discuss about the combination of basic controllers.
The proportional derivative controller is used to improve the stability of control system without affecting the steady state error.
The proportional integral controller is used to decrease the steady state error without affecting the stability of the control system.
The proportional integral derivative controller is used to improve the stability of the control system and to decrease steady state error.