The parameters are defined inside the mask of the DFIG Wind Turbine. To see it, do the following:
1) Double click the "DFIG Wind Turbine" block.
2) Under "Display" select "Control parameters for 1 wind turbine".
3) Scroll down to see the Frequency of the rotor-side PWM carrier and Frequency of the grid-side PWM carrier.
To see how the parameters in this dialog relate to the underlying variables such as "PWM_freq_rotor", do the following:
1) Right click on the "DFIG Wind Turbine" block.
2) Select Mask > Edit Mask
3) Go to the Parameter & Dialog tab
4) You can see how all the parameters in the dialog is related to the variables. The frequency ones are parameter #30 and #31.
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