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The subsystem consists of five areas as shown in figure 2:

• The blue area (PWM Enable (Module 1, 2)) enables the PWM signals of the inverter modules

• The green area (Frequency Reference (Module 1, 2)) is dedicated to adjusting the switching frequency of the inverter modules

• The yellow areas (Duty Cycle Reference (Module-1)) and orange (Duty Cycle Reference (Module-2)) areas are used to set individual modulation indexes for each leg of the inverter modules.

• The gray area (Signal Monitoring) is the block for receiving and monitoring data from the OPAL-RT simulator

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• The OP5707 IO Interfaceis used to interface the PWMs, voltages, current measurements, and encoder signals

• ThePWM_GENERATIONgenerates the PWM signals for the inverter modules based on the modulation index and switching frequency set by the user

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Connection Diagrams

• The connections of the OP5707 to the OP8662 and to the OP8219 are demonstrated in figure 4. The encoder terminal (DB9F) of the dynamometer needs to be connected to the encoder input (DB9F) of the OP8219 to measure the speed and position of the WRIM (DFIG). Connections must be performed as shown in figure 4.

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• Ensure that the Festo inverter modules 8857 are powered on using the 24 V AC voltage provided by the Festo power supply 8525 (figure 10).

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• Ensure that the 120 Ω resistive load Festo 8509 is switched on.

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• Launch RT-LAB.

• Import the model zip file in RT-LAB (see below).

• Build, load, and execute the model.

• Adjust the variable voltage knob to establish an AC voltage level with the amplitude of 80 Vpeak (Line-to-line voltage).

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Based on the preceding tests, the hardware and software included in Festo’s models are declared fully functional and compliant with OPAL-RT specifications.

Model (Zip File)

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