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Which one of the following is the transfer function of the PI-controller?

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Proportional Integral Controller:

This controller resembles the combination of the proportional and integral controller.

The structure of this controller is shown below:

This is used to decrease the steady-state error without affecting the stability of the system.

The transfer function is defined as:

Analysis:

The transfer function of the system is calculated as:

Disadvantages: Slow reaction to the disturbances.

Advantages:

1) It provides the zero control error

2) It is insensitive to the interference of the measurement channel.

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