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The harmonic impedance means the equivalent spectral impedance of the power system, as seen from the measurement point towards the supply source of the
system and the value of it allows one to evaluate the quality of the supply line,the risk of failure in case of overload and the risk of resonance between the system and the loads.
The harmonic impedance value is used for designing passive harmonic filters and for controlling the active ones.What I know is that this term si pure theoreticaly.
Regards
---------- Post added at 14:49 ---------- Previous post was at 14:47 ----------
If you want to get more(formulas, explications) try this pdf.Is really good.
The active ones means the active filters.An active filter is a type of analog electronic filter that uses active components such as an amplifier. Amplifiers included in a filter design can be used to improve the performance and predictability of a filter, while avoiding the need for inductors (which are typically expensive compared to other components).Active filters can implement the same transfer functions as passive filters,like high pass filter, low-pass filter,band -pass and notch filter.Of course the passive filters are those that uses only lumped components like coil, capacitors,resistors and transformers.
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