28335 Software PLL function for motor control application

What specifically does the customer want to use the pll for ? they need?

depending on the requirement the pll can be of different types, 3 phase, single phase and others..

Can you provide informaton for a 3-phase and a single phase software PLL? Thanks

We have some code for single phase pll, i can share it with you through a private message.

Please accept the friend request

Done. Thanks!, there wouldn't happen to be some code for 3-Phase would there?

Is there any way you could forward this code to me as well?

Thanks,

Jim

James,

The code is available through controlsuite, the PLL specifically is targeted for the single phase grid connected PV inverter, however the code structure can be used for any application,

Remember to select Solar Library when installing controlsuite, or if already installed you can update it to download the solar library. Once installed the code can be found at:

controlSUITE\libs\app_libs\solar\v1.0\float

regards

Manish Bhardwaj

Manish Bhardwaj,

About the code you mentioned in the controlsuite, I have some questions below:

In the code , there are some initialized value below,

void SPLL_1ph_init(int Grid_freq, int DELTA_T, SPLL_1ph *spll_obj)
{
 spll_obj->Upd[0]=SPLL_Q(0.0);
 spll_obj->Upd[1]=SPLL_Q(0.0);
 spll_obj->Upd[2]=SPLL_Q(0.0);
 
 spll_obj->ynotch[0]=SPLL_Q(0.0);
 spll_obj->ynotch[1]=SPLL_Q(0.0);
 spll_obj->ynotch[2]=SPLL_Q(0.0);
 
 spll_obj->ylf[0]=SPLL_Q(0.0);
 spll_obj->ylf[1]=SPLL_Q(0.0);
 
 spll_obj->sin[0]=SPLL_Q(0.0);
 spll_obj->sin[1]=SPLL_Q(0.0);
 
 spll_obj->cos[0]=SPLL_Q(0.999);
 spll_obj->cos[1]=SPLL_Q(0.999);
 
 spll_obj->theta[0]=SPLL_Q(0.0);
 spll_obj->theta[1]=SPLL_Q(0.0);
 
 spll_obj->wn=SPLL_Q(2*3.14*Grid_freq);

}

From the code above,we can see that : spll_obj->theta[0]=SPLL_Q(0.0); spll_obj->sin[0]=SPLL_Q(0.0);

But you konw ,because the sampling is random, the A/D sampling circuit can't sample the first Phase Voltage Value at theta[0]= 0,

So can you explain why set the spll_obj->theta[0]=SPLL_Q(0.0) ?

Regards!

Lyre