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max number of switches in Plecs RT BOX

0 votes
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hi there,

do you know what is the maximum number of switches I can emulate in the plecs RT BOX?

Thanks

Lello
asked Sep 20, 2018 by Lello (12 points)

1 Answer

0 votes
Hi Lello,

It’s a little hard to pinpoint the maximum number of switching devices that can be run on the RT Box, without having an understanding of your topology. Because with the power modules and PWM Capture blocks we are able to realize more devices while reducing the burden on the CPU.

If you are able to share what kind of topology you’re intending to run on the RT Box, please send us an email to support@plexim.com, so that we can help you better.

Regards,
Manu
answered Sep 21, 2018 by Manu Parimi (163 points)

Hi Lello,

To elaborate, the PLECS circuit to be deployed on the RT Box for a real-time simulation can be optimized using sub-cycle averaging and model splitting.

Model splitting — With model splitting, for complex circuits, the number of switching combinations can be reduced. For example, as shown in the attached image labeled modelsplit, if we split the model of the rectifier and inverter together at the DC link level, we can reduce the number of switching combinations to 2^7 instead of 2^12.


Sub-cycle averaging — Using the sub-cycle averaged (hybrid) modules combined with PWM Capture blocks, not only can we increase the PWM resolution to 7.5 ns, but for some topologies, the number of switching combinations can be reduced as well. For example, as seen in the attached image labeled subcycle, for a 3-phase NPC model, using sub-cycle averaging, the switching combinations can be brought down to 2^6 from 2^18.



Regards,
Manu

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