SVPWM output, on the RT-Box

Question

Dear PLEXIM team

I have the same problem as already described in the "High frequency space vector PWM output, on the RT-Box" from 05.03.2019:

"Hello

I am currently working with the RT-Box and trying to control a voltage source inverter from it. I have been using the PWM out block for the initial testing of the inverter, which have enabled me to run dead times of 100ns with 200khz switching frequency.

Now i am trying to do the same with the specevector PWM block, the problem lies in that to do so i need to use the digital out block and the blanking time block, but to get the same blanking time and switching frequency as in the initial testing the RT-Box step size must be 1e-7, which is not possible.

Is it simply not possible or am i looking at the problem in a wrong way?

Best regard

Tobias T. Strate"

Was it possible to extend the space vector modulation?

King regards,

Raphael Baumeler

Answer 1

Raphael,

There is not yet a ready-made library component for SVPWM on the RT Box that covers the range of customer use-cases.

However, it is possible to create one's own SVPWM for the RT Box. One example for a 3L-SVPWM modulator is shown in the ''SVPWM Control of a Grid-Connected Three-Level NPC Inverter" demo model included with the RT Box Target Support Package.  Another simple SVPWM approach would be to use common mode injection as shown in the "Three-Phase T-Type Inverter" model in the regular PLECS demo model library (d_cm = (max(d_a,d_b,d_c)+min(d_a,d_b,d_c))/2).

As suggested in the previous ticket, if you have a more specific need for your application you can contact support@plexim.com directly so we can see if we have a solution.

Regards,

Bryan