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Master of Science Thesis in Electric Power Engineering - page 37 / 114

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VOLTAGE ORIENTED CONTROL – SIMULATION

  • Ua Ub Uc are line voltage ;

  • Ed Eq are the dq transformation of Ua Ub Uc.

Em (V), ph to gnd amplitude (=Ed)

115√2

Id* (A)

3

Id*step (A) at 0.025s

3

Iq* (A)

0

Fsw (kHz), switching frequency

20

Figure 3.13 : Block diagram for current control tests

Remark : The tests can also be simulated in dq but we’ve decided to stay in ABC frame to model the rectifier and the grid impedance to be as close as possible to the real system.

Table 3.1 : Current controller simulation parameters

  • is selected equal to .

  • The Simulink block diagram is available in APPENDIX B B.1, Figure 0.7. We also advice to read

the simulation of coordinate transformation in APPENDIX A A.4 before.

SIMULATION

  • The bandwidth of the current controller have been selected at :

take a decade smaller than the switching frequency).

(we chose to

The system have been simulated in continuous and discrete (only the continuous simulation is shown here). No saturation or anti windup are present in this simulation. They will be added later.

PI controller, Kpi PI controller, Kii

(rad/s)

1.26e4

62.8 1.26e3

Parameters

Value

R ()

0.1

L (H)

5e 3

(rad/s)

2 50

28

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