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TMS320F280039C：TMS320F280039C

綱瑋 范
Prodigy 60 points
Part Number: TMS320F280039C
Other Parts Discussed in Thread: SFRA, C2000WARE

Tool/software:

I am currently designing a program for an inverter, using PR control for the controller. However, after several tests, I found that my current command (ui) always stays at the saturation value I set, and the switching cannot modulate. Is there something wrong with my settings?

my pr conroller code:

 // --- voltage ---
    ev = v_ref - v_feedbackcorrect;
    uv = (b0_v * ev + b1_v * ev1 + b2_v * ev2) + (a1_v * uv1 - a2_v * uv2);
    ev2 = ev1 ; ev1= ev ; uv2 = uv1 ; uv1= uv;

    if (uv > 10000)
    {
        uv = 10000;
    }
    else if (uv < -10000)
    {
        uv = -10000;
    }

    i_ref = uv;  // 將電壓控制器輸出作為電流參考

    // --- current ---
    //ei =  i_test_phase - i_feedbackcorrect;
    ei =  i_ref - i_feedbackcorrect;
    ui = (b0_i * ei + b1_i * ei1 + b2_i * ei2) + (a1_i * ui1 - a2_i * ui2);
    //ui = 901.62;
    ei2 = ei1 ; ei1 = ei ; ui2 = ui1 ; ui1= ui;

    if (ui > 923*0.99)
    {
        ui = 923*0.99;
    }
    else if (ui < -923*0.99)
    {
        ui = -923*0.99;
    }
  • 0
    TI__Genius 11945 points

    Check the open loop operation by applying applying same Vin and same PWM waveform to generate the same Vout you are trying to control in closed loop. If you cannot do this then your signal scaling needs to be adjusted.

    If this works, then it could be a PID controller issue. Run SFRA and then tune your loop. This is documented in our ref design docs. See C2000Ware Digital Power SDK for detail on many such ref designs

  • 0 in reply to Shamim Choudhury
    Prodigy 60 points

    Check the open loop operation by applying the same Vin and the same PWM waveform to generate the same Vout you are trying to control in closed loop. Do you mean that I am simply testing the current loop? Thank you for your reply.

  • 0 in reply to 綱瑋 范
    TI__Genius 11945 points

    Yes, that will be a test for the inner current loop. As I understand, your outer volt loop generates the ref current command for the inner current loop