CN2574276Y

CN2574276Y - High-performance passive single-phase filter circuit

Info

Publication number: CN2574276Y
Application number: CN 02266359
Authority: CN
Inventors: 来林娟
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-14
Filing date: 2002-08-14
Publication date: 2003-09-17
Anticipated expiration: 2012-08-14

Abstract

The utility model relates to a passive single-phase filter circuit with high-performance, which is characterized in that a transformer 2, a fundamental current series resonant circuit or a harmonic current parallel resonant circuit 3, and a harmonic current resonant circuit 4 are arranged in a loop of a single-phase electric network power supply 1, wherein the fundamental current series resonant circuit or the harmonic current parallel resonant circuit 3 is composed of a reactor L1 and a capacitor C1, the harmonic current resonant circuit 4 is composed of reactors L2, L3 and L4 and capacitors C2, C3 and C4, the original side of the transformer 2 is connected in the loop of the single-phase electric network power supply 1 in series, the auxiliary side is connected with the fundamental current series resonant circuit or the harmonic current parallel resonant circuit 3 to form a series loop, and the harmonic current resonant circuit 4 and a non-linear load 5 are connected to an electric network circuit on the right side of the transformer 2 in parallel. Compared with the prior art, the scheme has the advantages that the passive single-phase filter circuit has simple control, and complicated harmonic current calculation is omitted; the passive single-phase filter circuit has enough strong suppressing capacity to harmonic current injected to the electric network from the load; resonance possibly generated between the network system and the filters can be prevented; the passive single-phase filter circuit has favorable adaptive capacity to the unbalanced running of the electric network. The utility model can be used in electric networks required to compensate current harmonic.

Description

The passive single-phase filter circuit of high-performance

Technical field

The utility model relates to a kind of device that reduces harmonic wave, the passive single-phase filter circuit of particularly a kind of high-performance.

Background technology

Along with the extensive use of non-linear electric load, the mains by harmonics electric current pollutes also serious day by day.The existence of harmonic wave has serious harm, as the electric energy loss of increase system, circuit and equipment; Reduce the utilance of electrical source power factor and power system capacity; The fail safe of power system operation descends or the like.Therefore harmonic wave and governing problem thereof have caused national governments, have ground the great attention of educational circles and industrial circle.The improvement of harmonic wave at present has dual mode: 1) active improvement makes each user load not produce current harmonics.2) passive type is administered, and promptly each user load can produce harmonic current, but is absorbed by some harmonic wave absorption plants, and the excessive harmonic current that surpasses related standards with restriction injects electrical network.The present invention relates to passive type mains by harmonics electric current administration way.

Passive type mains by harmonics electric current is administered technology two kinds of main modes at present: (1) is simple passive filter group in parallel on electrical network, this kind mode major defect is: passive filter group in parallel may and electrical network between resonance takes place, reduced the network system reliability of operation.(2) active power filter on serial or parallel connection on the electrical network or mixing connection, this kind mode characteristics are to detect harmonic current or the harmonic voltage that load produces earlier, utilize power electronic device to produce harmonic current or the harmonic current of harmonic voltage counteracting load generation or the influence of harmonic voltage proportional again with this curtage, make the harmonic current that flows into electrical network reach minimum, the major defect of this kind mode is: quite control is complicated, and the reliability of device is low.

Summary of the invention

The utility model proposes a kind of scheme that relates to the passive filtering of passive type mains by harmonics electric current improvement.Can stop the load harmonic current to inject electrical network, can suppress the high-performance of electrical network resonance, the harmonic filter circuit of usefulness high reliability again, to improve the reliability and the ratio of performance to price of filter.

Fig. 1 is the passive single-phase filter circuit block diagram of high-performance, mark 1 is the single-phase electricity network source among the figure, and 2 is transformer, and 3 is fundamental current series resonant circuit/or humorous ripple electricity stream And connection resonant circuit, 4 are connected on harmonic current resonant circuit on the electrical network loop on transformer the right Wei And, and 5 is nonlinear load.

The passive single-phase filter circuit of a kind of high-performance, the loop that comprises single-phase electricity network source 1, nonlinear load 5, it is characterized in that: in the loop of single-phase electricity network source 1, be provided with transformer 2, the fundamental current series resonant circuit of forming by reactor L1 and capacitor C1/or Xie Bo Dian Liu And connection resonant circuit 3, the harmonic current resonant circuit of forming by reactor L2～L4 and capacitor C2～C4 4, wherein the former limit of transformer 2 is serially connected in the loop of single-phase electricity network source 1, its secondary and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 3 be connected to form series loop, power network line Shang And connects harmonic current resonant circuit 4 and nonlinear load 5 on the right of transformer 2;

Another feature of the present utility model is to set up transformer 6 in the loop of single-phase electricity network source 1, form fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 7 by reactor L5 and capacitor C5, the secondary of transformer 2 and fundamental current series resonant circuit/or the former limit of Xie Bo Dian Liu And connection resonant circuit 3 and transformer 6 be connected to form series loop, the secondary of transformer 6 and fundamental current series resonant circuit/or Xie Bo Dian Liu And join resonant circuit 7 and be connected to form the loop.

Above-mentioned filter circuit is on the former limit of transformer 2 and 6 or secondary Ke And connecting resistance, variable resistor, protection switch, or and combination; Can on the power network line on transformer group 2 the right, increase or reduce harmonic current resonant circuit 4 is set; ， Bu And connects harmonic current resonant circuit 4 when nonlinear load 5 is harmonic voltage source.

Transformer in the above-mentioned filter circuit, fundamental current series resonant circuit, the formed circuit of Xie Bo Dian Liu And connection resonant circuit, can stop nonlinear load on electrical network, to form the harmonic current that exceeds standard effectively, also stop the harmonic current of grid side to inject load, also stoped the harmonic voltage of grid side in load, to form the harmonic current that exceeds standard simultaneously.

With prior art relatively, the utility model has the advantages that: (1) control is simple, has omitted complicated harmonic current and has calculated, and has increased the reliability of filter circuit work; (2) harmonic current that injects electrical network from load there is very strong inhibition ability; (3) can stop contingent resonance between network system and the filter, increase the reliability of operation of power networks.Can be widely used in to carry out on the electrical network of current harmonics compensation.

Description of drawings

Fig. 1 is a high-performance passive filter circuit block diagram.

Fig. 2 is the passive single-phase filter circuit schematic diagram of a kind of high-performance.

Fig. 3 is the passive single-phase filter circuit schematic diagram of a kind of high-performance.

Fig. 4 is the passive single-phase filter circuit schematic diagram of a kind of high-performance.

Fig. 5 is the passive single-phase filter circuit schematic diagram of a kind of high-performance.

Embodiment

Embodiment 1:

A kind of passive single-phase filter circuit of high-performance that is used for electric locomotive, as shown in Figure 2.Transformer 2 is 800 kilovolt-amperes, and reactor L1 is 200 milihenries, and L2 is 20.7 milihenries, and L3 is 13.5 milihenries, L4 is 2.79 milihenries, the inductance quality factor q 1=Q2=Q3=30 of L1, L2, L3, and capacitor C1 is 50.7 microfarads, C2 is 10 microfarads, and C3 is 30 microfarads, and C4 is 30 microfarads.

Claims

1. passive single-phase filter circuit of high-performance, the loop that comprises single-phase electricity network source (1), nonlinear load (5), it is characterized in that: in the loop of single-phase electricity network source (1), be provided with transformer (2), the fundamental current series resonant circuit of forming by reactor (L1) and capacitor (C1)/or Xie Bo Dian Liu And connection resonant circuit (3), by reactor (L2, L3, L4) and capacitor (C2, C3, C4) the harmonic current resonant circuit (4) of Zu Chenging, wherein the former limit of transformer (2) is serially connected in the loop of single-phase electricity network source (1), its secondary and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit (3) be connected to form series loop, connect harmonic current resonant circuit (4) and nonlinear load (5) at the right of transformer (2) power network line Shang And.

2. filter circuit according to claim 1, it is characterized in that: in the loop of single-phase electricity network source (1), set up transformer (6), by reactor (L5) and capacitor (C5) forms the fundamental current series resonant circuit/or Xie Bo Dian Liu And join resonant circuit (7), the secondary of transformer (2) and fundamental current series resonant circuit/or the former limit of Xie Bo Dian Liu And connection resonant circuit (3) and transformer (6) be connected to form series loop, the secondary of transformer (6) and fundamental current series resonant circuit/or Xie Bo Dian Liu And join resonant circuit (7) and be connected to form the loop.

3. according to claim 1 and 2 described filter circuits, it is characterized in that: on the former limit of transformer (2,6) or secondary Ke And connecting resistance, variable resistor, protection switch, or and combination.

4. according to claim 1 and 2 described filter circuits, it is characterized in that: can increase on the power network line on transformer group (2) the right or reduce that harmonic current resonant circuit branch road being set.

5. according to claim 1 and 2 described filter circuits, it is characterized in that: ， Bu And connects harmonic current resonant circuit (4) when nonlinear load (5) is harmonic voltage source.