Lecture
Instantaneous power of a three-phase source of electrical energy:
P = P a + P b + P c = U a I a + U b I b + U c I c
The average for the period value of power, i.e. generator power is equal to the sum of the active powers of the individual phases. 
Active power of any phase: 
P = Pa + Pb + Pc
Reactive power is equal to the algebraic sum of the reactive powers of the individual phases:
Q = Qa + Qb + Qc
Full power module: 
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Electrical Engineering, Circuit design
Terms: Electrical Engineering, Circuit design