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  • The load is now

VOLTAGE ORIENTED CONTROL – SIMULATION . This resistor is set to a high value to avoid the discharge of

.

¬ Step

: Closing SW1 The AC side capacitor (filter) is charged (small transient). All IGBTs are OFF and the controller is in standby mode (no integration).

As

, there is no current flowing into the rectifier.

¬ Step

: Closing SW2 and START

SW2 is closed.

can now be neglected since

The controller is fully activated and the IGBTs can be turned ON.

.

SIMULINK BLOCK DIAGRAM

Figure 3.49 : Top level Simulink model

The Figure 3.49 shows the top level block diagram of Simulink. You can find the details of different block in APPENDIX F. Before presenting the simulation results, we have to precise two important points, that are, how the IGBT OFF state and how the disabled integrators are modeled in Simulink.

¬ IGBT OFF state When the IGBTs are OFF in our simulation, no current is flowing into the rectifier (DC link voltage is high enough and the body diode of the IGBTs are blocked). Consequently, we decided to force the current to zero with the Figure 0.39 in APPENDIX F.

¬ Disabled integrators The integrators are disabled by forcing the value to zero (another solution could be to set Ki to zero). You can see the Simulink block in APPENDIX F, Figure 0.35.

3.9.2

Verification

In this sub section, we verify that the equation presented in the second Chapter (“2.2.3 Limitations”).

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