Which one of the following provides excellent transient system and steady state response:
- Proportional + Integral action
- Proportional + Differential action
- Differential + Integral action
- Proportional + Differential + Integral
Correct answer: 4. Proportional + Differential + Integral
Proportional term: The proportional terms produces output value that is proportional to the error value. The response is adjusted by multiplying error by Kp constant.
Integral term: Integral terms is proportional to magnitude and duration of the error. Integral term eliminated residual steady-state error.
Derivative term: Derivative terms is used to improve stability of system