Why Does Amplitude Not Matter in Positive Sequence Detector Circuits?

AI Thread Summary
In positive sequence detector circuits, the amplitude of auxiliary currents i'alpha and i'beta is deemed unimportant, as stated in "Instantaneous Power Theory and Applications to Power Conditioning." This is because the dual method for extracting fundamental positive-sequence voltage relies on phase information rather than amplitude. Simulations in tools like Simulink confirm that the circuit functions correctly regardless of current amplitude. The mathematical operations within the circuit likely lead to cancellation effects that render amplitude irrelevant. Understanding these principles is crucial for effective application in power conditioning.
OliskaP
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Hi,

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 don't 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

psd.JPG

Source: Instantaneous Power Theory and Applications to Power Conditioning
 
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