This exercise presents the case of a DC to AC inverter, as shown.

In this model, the simulator provides the inverter pulses where the modulation frequency, the carrier frequency, and the modulation amplitude can be controlled.

The central feature in this exercise is to compare the same circuit side-by-side based on three setups, using:

Lab-Volt components
Simulink model with the IGBT from Simscape Electrical™ Specialized Power Systems (SPS) formerly known as SimPowerSystems™.
Simulink model with the IGBT from RTe-Drive.

This is done using a variable DC source where its value is directly fed into the three models. The same applies to the pulses generated by the Simulink model and fed to the physical model through the OP8660.

Materials Needed

Variable DC source (8821)
IGBT chopper/inverter (8857)
Inductance
Resistance
Measurement (OP8660)

Test Procedure

Make sure the connections are identical to the circuit shown in Schematics for Exercise 1
Make the connections between the physical circuit and the OP8660. Pay attention to the sign of the current measurement and voltage measurement
In the TestDrive user interface, open the panel Ex1_IGBT
Click to enable the inverter, and turn on the power supply
On the Power Supply, slowly turn the rheostat to increase the voltage to approximately 40 volts
Vary the DC bus (DC power supply) voltage and observe the current and voltage changes on the scope at the right
Now vary the modulation frequency

Before making any high voltage connections, the firing pulses must be tested for various cases.

The cable between the Lab-Volt IGBT chopper/inverter switching control and the OP8660 must be connected.
You can test both Inverter1 and Inverter2 by using two IGBT chopper/inverter modules

The All_resistive model must be ready to load
Connect an oscilloscope to the IGBT chopper/inverter switching control (yellow banana jacks numbered 1 through 6) to display pulses on a monitor
All 12 inverter pulses must be verified for each condition listed.

Test #	Condition always Pulses 0 when:	Passed
PULSE CONDITIONS
P1	Loading
P2	Reseting
P3	Pausing
P4	Flash update
P5	Network disconnect
P6	Target disconnect
P7	Mapping box disconnect

Once the model is running the model, you should check that each pulse...:

Test #	Condition for each pulse when model is running	Passed (check mark required)
RUNNING MODEL CONDITIONS
P8	...has its complement
P9	...has a minimum dead time of 2µs
P10	1 arm cannot be short-circuited using the pulse error ON/OFF in the console

This completes the firing pulse unit testing.

P1 to P4 and P8 to P10 test the software protection hard-coded in the bitstream.
P5, P6, P7 test the hardware protection made using a board inside the OP8660.

Now using the cable, IGBT chopper/inverter, variable source, inductance and resistance module make the connections as per the circuit in Annex B (for connection plan).

Make sure to use the variable DC source. Note that only the first 4 voltage and current sensors are tested in this model.

FIG 22 MISSING

Once the circuit is complete and running the model, turn ON the power of the IGBT bridge and the variable voltage source.

Turning the rheostat slowly to about 40 volts, use voltage display and make sure to select the right reading.

Looking at the console, all waveforms should be superimposed.

Once the circuit is complete and running the model, turn ON the power of the IGBT bridge and the variable voltage source.

Turning the rheostat slowly to about 40 volts, use voltage display and make sure to select the right reading.

Looking at the console, all waveforms should be superimposed.

In the figure above, we can see the current and the voltage; simulated results are superimposed with the real one.

The same model can be run using the second inverter bridge and using all the other measurements.

Pulses are sent to both inverter firing signal and the group 1 to 4 in the console to indicate which measuring group is used; the first 4 currents and 4 voltages correspond to group 1, the next 4 to group 2 and so on.

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