CN2391229Y - Digital wave three phase AC voltage stabilizing device - Google Patents

Abstract

The utility model relates to a digital-wave and three-phase AC voltage-stabilizing device. The utility model overcomes the defects of the prior art, such as large power dissipation, low efficiency, high temperature, poor three-phase output balance degree, large input current distortion, heavy weight, etc. The digital-wave and three-phase AC voltage-stabilizing device is provided with three double transformers and three single transformers, each of the single transformers is provided with two coil windings, each of the double transformers is provided with four coil windings, inductances with the uniform linear are arranged among phases and are connected in series with transformer windings of a plurality of saturable iron cores, and each phase is independent respectively. An input end is provided with a power-factor compensator with a triangular connection method, the storage capacitance is bridged between every two secondary phases, and the harmonic wave filtering with two and three times is output. The utility model has the advantages of less power consumption, small size, light weight, material saving performance, low temperature rise and small noise.

Description

The digital wave three-phase AC voltage stabilizer

The utility model relates to a kind of voltage stabilizer, particularly the digital wave three-phase AC voltage stabilizer.

At present, three-phase AC voltage stabilizer both domestic and external, no matter be three-in-one, or the magnetic saturation three-phase AC voltage stabilizer of three post cores, it is poor all to exist the three-phase alternating current quality of balance, require than higher to three-phase input quality of balance with to the output load quality of balance, relatively poor to the adaptability of imaginary loading, also exist power consumption big simultaneously, efficient is low, temperature rise, cost height, defectives such as Heavy Weight.In addition, this class voltage stabilizer oscillating capacitance has bigger harmonic current to flow through, thereby makes the withstand voltage and reliability of electric capacity that obvious decline be arranged.

The purpose of this utility model is to overcome the deficiency in the above-mentioned prior art, and a kind of electromagnetic circuit efficient height is provided, and simple in structure, volume is little, and the three-phase equilibrium degree is good, the reliability height, and noise is little, the digital wave three-phase AC voltage stabilizer of low cost of manufacture.

For realizing the purpose of this utility model, described digital wave three-phase AC voltage stabilizer is provided with three dual transformers and three single phase transformers, is provided with two coil winding on described single phase transformer, and they are respectively coil winding L _Sa1, L _Sa2, coil winding L _Sb1, L _Sb2With coil winding L _Sc1, L _Sc2, described dual transformer is provided with four groups of coil winding, and they are respectively coil winding L _Da1, L _Da2, L _Da3, L _Da4, coil winding L _Db1, L _Db2, L _Db3, L _Db4, coil winding L _Dc1, L _Dc2, L _Dc3, L _Dc4, single phase transformer coil winding L wherein _Sa1With dual transformer coil winding L _Da1, L _Db3, single phase transformer coil winding L _Sb1With dual transformer coil winding L _Db1, L _Dc3, single phase transformer coil winding L _Sc1With dual transformer coil winding L _Dc1, L _Da3Meet at the O point, single phase transformer coil winding L after the serial connection respectively _Sa2With dual transformer coil winding L _Da2, L _Db4, single phase transformer coil winding L _Sb2With dual transformer coil winding L _Db2, L _Dc4, single phase transformer coil winding L _Sc2With dual transformer coil winding L _Dc2, L _Da4Meet at O ' point after the serial connection respectively, inductance L is arranged respectively at input end ₁, L ₂, L ₃Be serially connected in single phase transformer coil winding L _Sa1, L _Sb1, L _Sc1On, capacitor C _Ac, C _Ab, C _BcAnd capacitor C _AC, C _AB, C _BCConnect with triangle respectively, be connected to input end c, a, 3 of b and output terminal C, A, B 3 points.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the circuit theory diagrams of digital wave three-phase AC voltage stabilizer.

Fig. 2 is the segment vector composite diagram among Fig. 1.

Fig. 3 is the induced voltage V among Fig. 1 _C1, V _C2, V _C3, V _A3, V _A1, V _A2, V _B3, V _B1, V _B2Timing waveform.

Fig. 4 is the output line voltage V among Fig. 1 _AB, V _BC, V _CAThe composite diagram that obtains according to formula (3), (4), (5).

Below in conjunction with accompanying drawing, the example of executing of the utility model digital wave three-phase AC voltage stabilizer is described in further detail:

As shown in fig. 1, the digital wave three-phase AC voltage stabilizer includes three dual transformer DT ₁, DT ₂, DT ₃With three single phase transformer ST ₁, ST ₂, ST ₃, on each single phase transformer, being provided with two coil winding, they are respectively coil winding L _Sa1, L _Sa2, coil winding L _Sb1, L _Sb2With coil winding L _Sc1, L _Sc2, each dual transformer is provided with four groups of coil winding, and they are respectively coil winding L _Da1, L _Da2, L _Da3, L _Da4, coil winding L _Db1, L _Db2, L _Db3, L _Db4, coil winding L _Dc1, L _Dc2, L _Dc3, L _Dc4, single phase transformer coil winding L wherein _Sa1With dual transformer coil winding L _Da1, L _Db3, single phase transformer coil winding L _Sb1With dual transformer coil winding L _Db1, L _Dc3, single phase transformer coil winding L _Sc1With dual transformer coil winding L _Dc1, L _Da3Meet at the O point, single phase transformer coil winding L after the serial connection respectively _Sa2With dual transformer coil winding L _Da2, L _Db4, single phase transformer coil winding L _Sb2With dual transformer coil winding L _Db2, L _Dc4, single phase transformer coil winding L _Sc2With dual transformer coil winding L _Dc2, L _Da4Meet at O ' point after the serial connection respectively.The iron core of single phase transformer and dual transformer can be E sections core or O sections core, all is arranged to saturable transformer.At input end inductance L is arranged respectively ₁, L ₂, L ₃Be serially connected in single phase transformer coil winding L _Sa1, L _Sb1, L _Sc1On, capacitor C _Ac, C _Ab, C _BcAnd capacitor C _AC, C _AB, C _BCConnect with triangle respectively, be connected to input end c, a, 3 of b and output terminal C, A, B 3 points.Inductance L ₁, L ₂, L ₃All be arranged to nonsaturable reactor, they and capacitor C _Ac, C _Ab, C _BcConstitute three-phase input power factor compensator.When input end c, a, 3 of b are connected electrical network, coil winding L _Sa1, L _Da1, L _Db3L _Sb1, L _Db1, L _Dc3L _Sc1, L _Dc1, L _Da3Produce induced voltage respectively on the secondary pickup coil winding of its correspondence, they correspond to induced voltage V respectively _A1, V _A2, V _B3V _B1, V _B2, V _C3V _C1, V _C2, V _A3, the secondary work voltage waveform of single phase transformer and dual transformer as shown in Figure 3.The secondary V of dual transformer among Fig. 1 _{12 '}With the potential difference of the secondary plotted point O ' of three-phase be: ${\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="Y9923869800072.png,Y9923869800073.png"\; state="\{\{state\}\}">V</figure-callout>}}_{12^{\&prime;},0^{\&prime;}}=\sqrt{3}{V}_{a2}\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right)$ In like manner as can be known ${\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="Y9923869800072.png,Y9923869800073.png"\; state="\{\{state\}\}">V</figure-callout>}}_{12^{\&prime;},22^{\&prime;}}=\sqrt{3}{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="Y9923869800072.png,Y9923869800073.png"\; state="\{\{state\}\}">V</figure-callout>}}_{12^{\&prime;},0^{\&prime;}}\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right)$ Line voltage V in the output of 3 of output terminals A, B, C _AB, V _BC, V _CACan be represented by the formula:

V _AB＝(V _a1+V _a2-V _b3)-(V _b1+V _b2-V _c3)…………(3)

V _BC＝(V _b1+V _b2-V _c3)-(V _c1+V _c2-V _a3)…………(4)

V _CA＝(V _c1+V _c2-V _a3)-(V _a1+V _a2-V _b3)…………(5)

Can be so synthesize as pulse among Fig. 4, through capacitor C _AC, C _AB, C _BCTwo, third harmonic filtering, exportable pure sine wave.

For making output terminal can access 220 volts phase voltage, be connected to three-phase transformer NT at 3 at described output terminals A, B, C.Three-phase transformer NT is three post core transformers.Every have two pickup coil windings on mutually, is respectively coil winding L _Na1, L _Na2, coil winding L _Nb1, L _Nb2With coil winding L _Nc1, L _Nc2, coil winding L _Na1With coil winding L _Nb2, coil winding L _Nb1With coil winding L _Nc2, coil winding L _Nc1With coil winding L _Na2Meet at O after the series connection respectively " (being the N point) point.Inductance L ₄With capacitor C ₄, inductance L ₅With capacitor C ₅, inductance L ₆With capacitor C ₆After the serial connection, be connected into the star-like connection that central point is N in twos at output terminal.The N point is a neutral point, and the voltage between output terminals A, 3 of B, C and the N point is phase voltage.Inductance L ₄, L ₅, L ₆With capacitor C ₄, C ₅, C ₆Constitute the even-order harmonic wave filter.

The utility model is arranged to saturable transformer because single phase transformer and dual transformer have adopted, and whenever alternate have identical linear inductance to be connected in series mutually with the Transformer Winding of several saturable cores, and each is independent separately mutually.During work, each transformer enters magnetic saturation in turn, so that iron core can design is smaller.Output terminal has the power-factor compensator of Δ connection, the special connection of the adaptable network of load reactance is adopted in output, it is per two alternate that storage capacitor is connected across, output has two, third harmonic filtering, available transformer is introduced neutral point and is obtained line, the three-phase four-wire system of two groups of voltages mutually, utilizes that peak power is saturated to carry out work.It is little to have power consumption, the efficient height, and volume is little, and is in light weight, the material saving, temperature rise is low, the advantage that noise is little.

Claims (2)

1. a digital wave three-phase AC voltage stabilizer is characterized in that having three dual transformers and three single phase transformers, is provided with two coil winding on described single phase transformer, and they are respectively coil winding L _Sa1, L _Sa2, coil winding L _Sb1, L _Sb2With coil winding L _Sc1, L _Sc2, described dual transformer is provided with four groups of coil winding, and they are respectively coil winding L _Da1, L _Da2, L _Da3, L _Da4, coil winding L _Db1, L _Db2, L _Db3, L _Db4, coil winding L _Dc1, L _Dc2, L _Dc3, L _Dc4, single phase transformer coil winding L wherein _Sa1With dual transformer coil winding L _Da1, L _Db3, single phase transformer coil winding L _Sb1With dual transformer coil winding L _Db1, L _Dc3, single phase transformer coil winding L _Sc1With dual transformer coil winding L _Dc1, L _Da3Meet at the O point, single phase transformer coil winding L after the serial connection respectively _Sa2With dual transformer coil winding L _Da2, L _Db4, single phase transformer coil winding L _Sb2With dual transformer coil winding L _Db2, L _Dc4, single phase transformer coil winding L _Sc2With dual transformer coil winding L _Dc2, L _Da4Meet at O ' point after the serial connection respectively, inductance L is arranged respectively at input end ₁, L ₂, L ₃Be serially connected in single phase transformer coil winding L _Sa1, L _Sb1, L _Sc1On, capacitor C _Ac, C _Ab, C _BcAnd capacitor C _AC, C _AB, C _BCConnect with triangle respectively, be connected to input end c, a, 3 of b and output terminal C, A, B 3 points.

2. digital wave three-phase AC voltage stabilizer according to claim 1 is characterized in that being connected to three-phase transformer at described output terminal C, A, 3 of B, and every have two pickup coil windings on mutually, is respectively coil winding L _Na1, L _Na2, coil winding L _Nb1, L _Nb2With coil winding L _Nc1, L _Nc2, coil winding L _Na1With coil winding L _Nb2, coil winding L _Nb1With coil winding L _Nc2, coil is around é L _Nc1With coil winding L _Na2Meet at the N point, inductance L after the series connection respectively ₄With capacitor C ₄, inductance L ₅With capacitor C ₅, inductance L ₆With capacitor C ₆After the serial connection, be connected into the star-like connection that central point is N in twos at output terminal.

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