In a general context, we can refer to harmonic filters as passive and active filters. Their essential difference, as illustrated in this chapter, stands on whether they provide a (passive) filtering action within a selected bandwidth or as a result of a real-time (active) monitoring process that leads to the injection of real-time canceling harmonic currents.
One of the most common methods for control of harmonic distortion in industry is the use of passive filtering techniques that make use of single-tuned or band-pass filters. Passive harmonic filters can be designed as single-tuned elements that provide a low-impedance path to harmonic currents at a punctual frequency or as band-pass ...
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