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PGCIL DT Electrical 13 Aug 2021 Official Paper (NR I)

Option 4 : The derivative controller

Effects of Proportional Derivative (PD) controllers:

- Decreases the type of the system by one
- Reduces the rise time and settling time
- Rise time and settling time decreases and Bandwidth increases
**The speed of response is increased i.e. the transient response is improved**- Improves gain margin, phase margin, and resonant peak
- Increases the input noise
- Improves the stability

Effects of Proportional Integral (PI) controllers:

- Increases the type of the system by one
- Rise time and settling time increases and Bandwidth decreases
- The speed of response decreased i.e. transient response becomes slower
- Decreases the steady-state error and steady-state response is improved
- Decreases the stability