Reactive Power Meter for Nonsinusoidal Systems

This paper describes a novel reactive power meter realized by electronic circuits that determine successively the terms of the equation Q = Σn=1 V
_r
I
_r
,sin ϕr for n significant harmonics. The harmonic contributions to the total reactive power is determined by electronic simulation of the mathematical expression that sets the orthogonal condition of two functions in a periodical interval. Partial reactive power with its sign are stored and added in a circuit to get at the end of the cycle the total reactive power. A control system permits operation in a repetitive form.