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Master of Science Thesis in Electric Power Engineering - page 40 / 114

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VOLTAGE ORIENTED CONTROL – SIMULATION

1

3

2

2

(3.26)

Then, the system transfer function

is

2

Figure 3.16 : Voltage control loop

 Controller transfer function

(3.27)

where

is the estimation of

and

(rad/s) is the bandwidth of the voltage controller. Then,

give us a proportional coefficient

:

(3.28)

with

(Em is the amplitude of the three phase input voltage in the model section

2.2.2 Mathematical model”)

We will choose

at least a decade smaller than the current control bandwidth.

10

(3.29)

As we can see there is no integrator part in the controller. In our controller, we will add a small

integrator part with gain

(for example

).

3.5.3 Voltage saturation, anti windup, active damping SATURATION, ANTI WINDUP

Exactly as the current controller, we have to add a saturation (on current id*) and an anti windup is highly recommended (useful is the saturation limit is reached).

In this case we can write :

31

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