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1 Test sequences and scenarios
2 Shutdown Sequences
3 Demo File

In order to run the example model, the following steps must be passed. The model execution provided below includes several test scenarios to convert different control aspects of a PELab unit.

Test sequences and scenarios

Make the power and control configurations detailed in figure 9 and figure 10
Open the model attached to this page using RT-LAB.

Figure 16. Demo model opened in RT-LAB environment

Build and run the model in RT-LAB
Set the maximum voltage of the DC power supply to 500 V and current to 15 A
Set the voltage rise time to 15 s or any equivalent slew rate which will ensure smooth pre-charge of the DC-link capacitors
Enable the output of the DC power supply and wait until the voltage reaches to 500 V. On the “Voltages” scope, the following results must be observed

Figure 17. Status of the voltages after pre-charging the DC links of the PELab power modules

Set the reference signal of both power modules to 60 Hz

Figure 18. Reference frequency of the first module

Figure. 19. Reference frequency of the second module

Set the switching frequency to 20 kHz for both power modules

Figure 20. Switching frequency of the first module

Figure 21. Switching frequency of the second module

Increase the modulation index of both modules to 0.5

Figure 22. Modulation index of the first module

Figure 23. Modulation index of the second module

Enable the PWM modulators for both power modules

Figure 24. Enable button of the PWM modulator for the first power module

Figure 25. Enable button of the PWM modulator for the second power module

Observe the modulation index of each module through the following scopes. The index must be the same as the reference

Figure 26. Monitoring scope for the modulation index of the first power module

Figure 27. Monitoring scope for the modulation index of the second power module

Figure 28. Modulation index of the first power module

Figure 29. Modulation index of the second power module

Monitor the voltages and currents using the dedicated scopes in the console

Figure 30. Voltages of both power modules

Figure 31. Currents of both power modules

Use an oscilloscope (Tektronix was used in this demo) to monitor the phase voltage, line-to-line voltage, and phase current of the first power module

Figure 32. Phase voltage (yellow), line-to-line voltage (blue), and phase current (purple)

Set the switching frequency to 30 kHz for the first power modules

Figure 33. Switching frequency of the first module

Prepare an oscilloscope (Tektronix was used in this demo) in triggered single mode
While operating the system with the previous setting, increase the modulation index of the first module from 0.5 to 0.9

Figure 34. Modulation index of the first module

Monitor the transient effect of the modulation index variation on the phase voltage, line-to-line voltage, and phase current of the power module using the oscilloscope

Figure 35. Phase voltage (yellow), line-to-line voltage (blue), and phase current (purple)

Reduce the modulation index of the first power module to 0.8

Figure 36. Modulation index of the first module

Reduce the switching frequency of the first module to 10 kHz

Figure 37. Switching frequency of the first module

Prepare the oscilloscope (Tektronix was used in this demo) in triggered single mode
Increase the switching frequency of the first module from 10 kHz to 40 kHz
Monitor the transient effect of the switching frequency variation on the phase voltage, line-to-line voltage, and phase current of the power module using the oscilloscope

Figure 38. Phase voltage (yellow), line-to-line voltage (blue), and phase current (purple)

Prepare the oscilloscope (Tektronix was used in this demo) in triggered single mode
While maintaining the same operational condition of the previous test, increase the reference frequency of the first power module from 60 Hz to 120 Hz.
Monitor the transient effect of the reference frequency variation on the phase voltage, line-to-line voltage, and phase current of the power module using the oscilloscope