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TIDM-HV-1PH-DCAC: control scheme question

Howard Zou
Genius 12365 points
Part Number: TIDM-HV-1PH-DCAC

Hi，

I have several questions about the picture below:

1. Vc=Vo is wrong here for grid connected inverter, right?

2. Zf in Figure 13 is Zc in Figure 12, right?

3. What does Kvdc_fbk and Gd means in Figure 13?

4. The equation from Vi to Io in Figure 13 should be reciprocal of the equation existing, right?

5. For grid connected inverter, we can use Zi only, right? What's the benefit for adding Zi, Zc, Zg (LCL in the circuit)?

  • 0
    TI__Mastermind 43730 points
    1. Vc=Vo is wrong here for grid connected inverter, right?

    Yes, sorry this is carry forward from voltage source inverter, it should have been removed for the GCI

    2. Zf in Figure 13 is Zc in Figure 12, right?
    Yes

    3. What does Kvdc_fbk and Gd means in Figure 13?
    Gd-> digital delay, this is typically 1.5 Tpwm
    Kvdc_fbk -> this is gain inverse, 1/Vdc_max_sense. If you have a filter then 1/(Vdc_max_sense*Gfltr)

    4. The equation from Vi to Io in Figure 13 should be reciprocal of the equation existing, right?
    Yes

    5. For grid connected inverter, we can use Zi only, right? What's the benefit for adding Zi, Zc, Zg (LCL in the circuit)?
    Attenuation of switching frequency is better with LCL,

    I have filed the above as task in INV project to fix documentation, this may take upto 3-4 months to be reflected, Sorry for the confusion.