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Original question:

TIDA-01606: DQ-decoupling based current loop control or Decoupled double synchronous reference frame current controller

TIDA-01606: ADC sampling

asher_wang Wang
Prodigy 50 points
Part Number: TIDA-01606

Hi TI's team,

Hope you have a nice day.

I have found grid side voltage (VGRID_A,VGRID_B,VGRID_C) and dc-link voltage(VBUS_ADC) sampling have been triggered four times in each cycle. But the inverter side voltage and other sampling are only triggered once in each cycle. 

What's the major reason and major concerns about these difference?

#define TINV_VBUS_READ (float32_t)(TINV_VBUS_READ_1 + TINV_VBUS_READ_2 + TINV_VBUS_READ_3 + TINV_VBUS_READ_4) * (0.25f)
#define TINV_VGRID_A_READ (float32_t)(TINV_VGRID_A_READ_1 + TINV_VGRID_A_READ_2 + TINV_VGRID_A_READ_3 + TINV_VGRID_A_READ_4) * (0.25f)
#define TINV_VGRID_B_READ (float32_t)(TINV_VGRID_B_READ_1 + TINV_VGRID_B_READ_2 + TINV_VGRID_B_READ_3 + TINV_VGRID_B_READ_4) * (0.25f)
#define TINV_VGRID_C_READ (float32_t)(TINV_VGRID_C_READ_1 + TINV_VGRID_C_READ_2 + TINV_VGRID_C_READ_3 + TINV_VGRID_C_READ_4) * (0.25f)

  • 0
    TI__Expert 3270 points

    Hi Wang,

    having 4 measurements will allow a measurement less disturbed.

    I suggest to take multiple measurements for all the variable of the system, however ADC are limited in times and quantity and this is the reason why we cannot measure multiple times. 

    By describing the measurement of TIDA 01606:

    Current for the control loop (this value comes out from a SDFM, which is by definition a mean value, analog value cannot be used because there are problems of noise in general)

    Voltage for voltage control loop (this value comes from the mean value)

    Power calculation (this value comes from a filtered value)

    I hope that I have answered your question :)

    Thanks

    Best Regards

    Riccardo