Novel full frequency spectrum electrical active filter

Novel full frequency spectrum electrical active filter

  • CN 101,447,672 B
  • Filed: 09/22/2008
  • Issued: 09/24/2014
  • Est. Priority Date: 09/22/2008
  • Status: Active Grant
First Claim
Patent Images

1. a novel full frequency spectrum electrical active filter, comprise the entire spectrum harmonic separation circuit that the harmonious wave transformer of three-phase standard sine wave transformer BH2 forms, it is characterized in that:

  • the method for separated entire spectrum harmonic wave, be that two distortion voltage U 1 and standard sine wave voltage U 2 with first-harmonic identical phase characteristic are compared, thereby isolate entire spectrum harmonic voltage component;

    The voltage U that wherein distorts 1 is connected to the upper end of humorous wave transformer First Line circle B2-1, standard sine wave voltage U 2 is connected to the lower end of humorous wave transformer First Line circle B2-1 by the reactor L of series connection, utilize the first-harmonic equipotential principle in distortion voltage U 1 and standard sine wave voltage U 2, by comparing, eliminated the fundametal compoment in humorous wave transformer First Line circle B2-1, the first coil B2-1 two ends of humorous wave transformer remaining be exactly the entire spectrum harmonic voltage component that distorts and contain in voltage U 1;

    This entire spectrum harmonic voltage component produces anti-phase harmonic voltage in the another side coil B2-2 of humorous wave transformer, after this anti-phase harmonic voltage and 2 stacks of standard sine wave voltage U, become new synthetic distortion voltage, because its waveform comprises anti-phase harmonic voltage, according to active power filtering principle, this synthetic distortion voltage is injected to electrical network, just can offset original harmonic wave, realize the object of full frequency spectrum electrical active power filtering;

    Three-phase standard sine wave transformer BH2 is common three-phase power transformer, its primary coil left end head and user'"'"'s distribution transformer BH1 primary coil left end head are parallel-connected to the high-pressure side of power supply, the termination of its secondary a phase coil is connected with reactor L left end head, and the right-hand member head of reactor L is connected with the lower end of humorous wave transformer the first and second coils;

    Humorous wave transformer is a two-winding transformer, and its two different lower ends of the first and second coil polarity are connected with the right-hand member head of reactor L, and the left end head of reactor L is connected with the termination of BH2 level a phase coil of three-phase standard sine wave transformer;

    Two two ends that upper end is received respectively single-phase autotransformer the second coil B1-2 of two coils of described humorous wave transformer, wherein the upper end of humorous wave transformer First Line circle B2-1 is also connected with the termination of BH1 level a phase coil of user'"'"'s distribution transformer, and the upper end of humorous wave transformer the second coil B2-2 is also connected with the upper end of single-phase autotransformer the first coil B1-1 and the left end head of load;

    Single-phase autotransformer the first lower end of coil B1-1 and the lower end of load are connected with the neutral line of power-supply system, and tie point voltage is 0.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×