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TIDA-010933: How do I properly configure the board for 120 V 60 HZ operation

Juan Luera
Prodigy 40 points

Part Number: TIDA-010933

Tool/software:

My initial hypothesis was to change vref to around 200VDC instead of 380VDC I also changed some of the parameters in the dcac_settings.h file so that vDC max was around 214V, and changed the AC frequency to 60 HZ. However, I also saw that there is an ac modulation parameter of around .83636. What is the proper way to achieve ac modulation at 120Vrms? Also if I'm reducing the output voltage, should I change the parameters for the control loops. I tweaked them to around halve their original value, so that they're not as aggressive.

Any input is appreciated

p.s. i do have the proper gan's for 120vrms operation.

  • 0
    TI__Expert 3270 points

    if you are trying to operate an open loop condition of the DCAC converter and you would like to achieve 120 Vrms you need to do the following calculations:

    1) 120 x 1.41 this will become your peak voltage on teh grid.

    2)120x1.41/200 = 0.846 This will become your peak index modulation. This basically gives you teh ac modulation parameter that you need to have.

  • 0 in reply to Riccardo Ruffo
    Prodigy 40 points

    Cool, that's more or less how I had set up my code. Would you recommend tweaking the PI controllers in any way for this lower voltage operation? Also, for the phase matching I don't have to worry about that right the sogi-pll handles that?

  • 0 in reply to Juan Luera
    Prodigy 40 points

    Also this last comment is for grid operation not the open loop. Also i noticed the vac max was little higher than the reference on the code. I set mine to around 207. I wasn't sure why this was the case.

    Best,

    Juan Luera