Power values and harmonics
From Electrical Installation Guide
Contents |
Active power
The active power P of a signal comprising harmonics is the sum of the active powers resulting from the currents and voltages of the same order.
Reactive power
Reactive power is defined exclusively in terms of the fundamental, i.e.
Distortion power
When harmonics are present, the distortion power D is defined as 
where S is the apparent power.
