| abstract |
The utility model discloses a kind of power filter device with first-harmonic resonance unit, described device includes first-harmonic resonance unit and filter unit, first-harmonic resonance unit is used to form series resonance to fundamental wave, zero impedance is presented to fundamental wave, big impedance is presented to harmonic wave, so that harmonic wave flows into filter unit, and then suppress harmonic wave and flow into power network；Filter unit includes N number of branch road, and Low ESR is presented to particular harmonic in each branch road, so as to form harmonic wave path；Simultaneously by controlling brancher access number, power system reactive power is adjusted, and then optimize power factor of electric network. |