TMS320F28035: Power Factor Correction In Grid Tie Inverter?

Your question is not very clear. It seems like your application is a grid tie inverter. In such case you want to maintain your inverter current in phase and at same frequency with grid voltage in order to maximize power transfer to grid. A PLL control loop can ensure this condition. With inverter current in phase/freq with grid voltage the inverter power factor is unity. Is this the power factor you are talking about?

Or you want to operate a GTI in a PF converter mode? In that case you are talking about a bi-directional Inverter/PFC application.

For the first case we have TI Design at TI website. You can download the complete hardware design, software, and documentation. 

For the second case we dont have any bi-dir PFC/Inverter design at this time.

Shamim

->"Your question is not very clear. It seems like your application is a grid tie inverter. In such case you want to maintain your inverter current in phase and at same frequency with grid voltage in order to maximize power transfer to grid. A PLL control loop can ensure this condition. With inverter current in phase/freq with grid voltage the inverter power factor is unity. Is this the power factor you are talking about?"

Yes this is what i am taking about Three Phase GTI (Grid Tied Inverter)!

The point is, if My inverter is set to inject power to grid with Unity Power factor i.e. just the active power, but due to reactive power on the grid the total power Factor will reduce. This will be a issue .

How to go about this?

I believe what you are saying is that grid voltage has harmonics (not a pure sine wave voltage) and so you cannot inject all real power with a sine wave current from the inverter. If this is true then my answer is nothing can be done to improve the amount of injected power when the grid itself is distorted.

Shamim