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I am studying a positive sequence detector and have some trouble understanding it. I understand most of it, but the author in the book "Instantaneous Power Theory and Applications to Power Conditioning" writes:

For extracting the fundamental positive-sequence voltage with the dual method shown in Fig. 4-27, the amplitude of the auxiliary currents i'alpha and i'beta are not important, and can be chosen arbitrarily.

I dont understand why the amplitude of the currents from the PLL circuit does not matter. I have simulated this in Simulink and verified that the circuit works. Does the amplitude cancel each other out behind all the math in some of the blocks?

Best regards

Source: Instantaneous Power Theory and Applications to Power Conditioning

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# Positive Sequence Detector

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