ADE7755: Active and Harmonic Power

Hello

In this link

http://www.analog.com/static/imported-files/data_sheets/ADE7755.pdf  at page 13, it shows the formula of harmonic power.

I do know that active power is being measured by multiplying instantaneously both voltage and current without including the power factor. But is the measurement is correct event without considering the power factor ?

But, in Figure 23 at page 12 also shows the power factor also being included. So,  for the  energy meter practical simulation, how does the harmonic power factor being detected for power measurement?  It is just I'm being confused on how does the power factor and also harmonic power factor being detected in this meter to measured the active power.

Thanks a lot.

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