Harmonic filters remove harmonic current from the network and improve load power factor. Some applications require harmonic mitigation without any significant reactive power contribution, for example when non-linear loads operate at close to unity power factor and the network cannot accept leading reactive power.
ONE has designed, delivered and tested solutions based on harmonic filters that draw current only at harmonic frequencies, and describe the design and steady state and transient performance in a technical note. The outcome is a passive filter circuit that is an effective solution of harmonic distortion yet that draws almost no fundamental frequency current, and has no onerous switching requirements.
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