Method and apparatus for real time measurement of three phase electrical parameters
A technology of phase electricity and reference vector, applied in the real-time measurement of balanced or unbalanced three-phase electrical parameters, in the field of real-time measurement
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[0015] A preferred embodiment of the present invention is illustrated at 100 in Figures 1A and 1B. Broadly speaking, in the preferred embodiment, there are three main functional parts, namely quadrature detector, phase locked loop and phase shift feedback. These functional parts will be introduced one by one below. Figure IA is discussed first, but it should be appreciated that most of these functions are repeated in Figure IB, albeit for a different input signal.
[0016] The quadrature detector section preferably includes signal inputs 110a, 110b connected to multiplication blocks 114a, 114b, 114c, 114d, respectively, which are also connected to the reference sine signal 118 and cosine signal of the output voltage controlled oscillator (VCO) 116 120 connections. Each of the multiplication blocks 114a, 114b, 114c, 114d is connected to a low-pass filter 126a, 126b, 126c, 126d which is also connected to a square function 132a, 132a, 132b, 132c, 132d are connected. Additiona...
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