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CCS/TMS320F28335: software Phase Locked Loop Design Using C2000™Microcontrollers for Single Phase Grid Connected Inverter

user5031811
Prodigy 30 points
Part Number: TMS320F28335
Other Parts Discussed in Thread: CONTROLSUITE, C2000WARE-DIGITALPOWER-SDK, TIDM-HV-1PH-DCAC, TIDM-1007, C2000WARE

Tool/software: Code Composer Studio

Hello，everyone！

Now，I have a problem about software Phase Locked Loop and need your help.

In my code, "SPLL_1ph_SOGI_F.c" is used to  lock grid phase. This file implements a software phase lock loop based on orthogonal signal generation using second order generalized integrators.

And, "SPLL_1ph_SOGI_F.c" is located in "controlSUITE\libs\app_libs\solar\v1.2".

I have done everything according to "controlSUITE\libs\app_libs\solar\v1.2\SolarLib.pdf\page86".

However, it doesn't work and I can't get the grid phase. WHY?

Q1:

In "controlSUITE\libs\app_libs\solar\v1.2\SolarLib.pdf\page86",

Step 4 – Using the module
spll1.u[0]=(Float32)(GridMeas);

what's the value of GridMeas?    220VAC/50Hz voltage is used in my program.

Q2:

Do I need to adjust these parameters？

 // loop filter coefficients for 20kHz
 spll_obj->lpf_coeff.B0_lf=(float32)(166.9743);
 spll_obj->lpf_coeff.B1_lf=(float32)(-166.266);
 spll_obj->lpf_coeff.A1_lf=(float32)(-1.0);

Thamks. I am looking forward to your reply.

 

 

  • 0
    TI__Mastermind 43730 points

    1. Please note you are referring to controlSUITE code, these modules in controlSUITE are in non-maintained state. We have moved our collateral into C2000Ware-DigitalPower-SDK

    2. The input for the module is vac measurement in per unit value which is +1 to -1

    3. The coefficients for the loop filter need to be tuned, we provide an excel file to tune that, see spll_coeff_compute.xlsx

    C:\ti\controlSUITE\libs\app_libs\solar\v1.2

    4. We use this in several projects inside the C2000Ware-DigitalPower-SDK
    see
    TIDM-1007, TIDM-HV-1PH-DCAC code for the latest information and interface of the module, which brings this out more clearly.

    The documentation is here:

    file:///C:/ti/C2000Ware_DigitalPower_SDK_1_03_00_00/docs/html/dplib_html/group___s_p_l_l__1_p_h___s_o_g_i.html

  • 0 in reply to Manish Bhardwaj
    Prodigy 30 points
    How can I get vac measurement in per unit value？In project , I don't know the max value of grid.
  • 0 in reply to user5031811
    TI__Mastermind 43730 points

    You do not know the grid max value, but you know the sense circuitry you designed to sense that voltage (res dividers, op-amps etc). That will give you what will be the max that ADC can sense. Which is used for the per unit value calculation,