Power factor correction

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Power Factor Correction (PFC) is often employed to correct the reactive power load (VAR) and to bring the delivered power to the load in phase.

Alternating current has two characteristics, complex power (Volt Amps Reactive) and real power (Watts). These quantities can be determined by calculation or measurement knowing a few important factors, such as the magnitude of the power, the phase angle, or the magnitude of the components.

These components are:

$P = V I c o s θ$ , Where P is real power in Watts [W]

$Q = V I s i n θ$ , Where Q is reactive power in Volt Amps Reactive [VAR]

$S = P + j Q$ , Where S is the complex magnitude of the complex power.

Apparent Power is the absolute value of the complex power vector S, and is the more familiar measure of power in Volt Amps [VA].

$S = VI(cos\theta +jsin\theta)=VI\angle\theta$ [VA]