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Master of Science Thesis in Electric Power Engineering - page 33 / 114

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VOLTAGE ORIENTED CONTROL – SIMULATION

1

(3.7)

with

the decoupled system transfer function from

to .

 Controller transfer function As the complex transfer function is a first order (representing two non interacting first order

system in the

and

directions), a PI controller is enough :

(3.8)

Based on IMC method of [14] , we can write

(3.9)

with

(rad/s) the current controller bandwidth where the pole of

is placed, and

the

estimation of

. Finally, we obtain the PI coefficients :

and

.

(3.10) (3.11)

For this inner current control loop, the bandwidth below the sampling frequency (Fs [Hz]) [14] ).

should be selected smaller than a decade

10

(3.12)

 Decoupled current control design In order to establish the decoupled current control diagram, we have to continue with equation (3.6). We define , complex integrator state variable as :

(3.13)

Then, we can write the real and imaginary part to get our reference voltage and draw our current controller block diagram :

24

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