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C2000-DIGITAL-CONTROL-LIBRARY: How to improve the PF of PFC with C2000 MCU (PFC control , demo code is PFC2PhiL)

sheldon liu
Prodigy 240 points
Part Number: C2000-DIGITAL-CONTROL-LIBRARY
Other Parts Discussed in Thread: TMS320F28022, TIDM-1022, TIDM-1007

when  I debug PFC with TMS320F28022 (demo code is PFC2PhiL).  The input current lead the input voltage.  The waveform is  as below picture.  

The PF is 0.994.  But we need it about 0.998 or higher.   Is there any advice?  Thank you.