Programing C2000 F28069M using Matlab simulink

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Damsith Wasala
Damsith Wasala 2020-1-10
回答： Antonin 2020-1-14
I am using malab2019b simulink version to program the c2000 f28069m development kit
I do my project on 3 phase inverter and I need to synchronize the inverter with the grid and control the output voltage of the inverter. I did my simulation and it run correctly in Matlab. the switching frequency that I need is 20kH for controlling . But when I upload this to the board it can only work for 2.5kH only. If the switching frequency increased than 2.5kH it gives a error. (I change the sampling time according to the switching frequency.).
Other problem is I am using a ADC block to give the input(Voltage measurement) input signal is distorted more. I attach some pictures of my output and simulation.
in hear sample time is 0.0001s
Screenshot (89).png
******
This is my Input sine wave shows in Matlab Scope
Screenshot (90).png
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I incresed sample time to 0.00001 and then this error occur
Screenshot (91).png
plz give me a solution for this two problems
Thank you.

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回答（2 个）

Venkatesh Chilapur
Venkatesh Chilapur 2020-1-13
Hi,
We have motor control example using ePWM block which is more efficient way to produce the 3phase output than GPIO DO. Here is the link to the page:
Motor Control TI C2000
You may also find the video handy when exploring these models.
https://www.youtube.com/watch?v=wxYTLbYfBP0
Regards,
Venkatesh C
Antonin
Antonin 2020-1-14
Hi Damsith Wasala,
This is a logging issue. Your ADC is fine, External mode is not able to log at these rates.
Please take a look at the answer I provided on this page:
https://www.mathworks.com/matlabcentral/answers/353939-can-simulink-use-ti-c2000-launchxl-f28027f-or-f2808-to-monitor-a-analog-signal-200khz
If you want to log at 20kHz, I suggest that you use the technic descirbed as 2-model approach.
I hope it helps,
Thanks,
Antonin.

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