CN201449866U - 36-pulse-wave high-power frequency conversion rectifying transformer - Google Patents

Abstract

The utility model relates to a 36-pulse-wave high-power frequency conversion rectifying transformer, comprising a three-phase input primary winding which adopts Y-shaped connection and a secondary winding which adopts epitaxy delta connection to shift phase, and the three-phase input primary winding and the secondary winding are arranged on a bracket; the secondary winding is divided into three groups, each group comprises six phase-shifting groups, the phase-shifting angles are +25 degrees, +15 degrees, +5 degrees, -5 degrees, -15 degrees and -25 degrees respectively, and the angular difference of the phase-shifting groups is 10 degrees, each phase is formed by serially connecting a plurality of power units, and the difference of the adjacent phases of the three-phase secondary output is 10 degrees, and the six phase-shifting groups controls triggered controlled silicon IGBT to obtain 18 plus pulse waves and 18 minus pulse waves by three-phase pulses with different time sequences; each phase-shifting group is provided with three taps, and each group is provided with 18 taps to be connected with output line banks at one side of the bracket correspondingly, and three groups of the output line banks are connected with a frequency converter; the 36-pulse-wave high-power frequency conversion rectifying transformer can reach less than 5 percent of current harmonic wave tapping at grid side and has the advantages of compact structure, small volume, simple installation, less field wiring and convenient debugging.

Description

A kind of 36 pulse high-power frequency conversion rectifier transformers

Technical field

The utility model relates to a kind of rectifier transformer, especially with the supporting rectifier transformer of 36 pulse high-power frequency conversion devices.

Background technology

International energy crisis; make high-efficiency energy-saving technology and device systems that the urgency of demand arranged; on the other hand; breakthrough has appearred in power electronic technology; develop into the inverter stage from commutation phase; be systems such as realization power adjustments tandem adjustment, the energy-conservation possibility that the realization technology is provided, the eighties, converter technology began to find broad application in major industrialized country as a kind of power-saving technology.Frequency conversion not only plays energy-conserving action and also plays precision process control.It is wide that frequency converter timing has speed adjustable range, adjusting speed accuracy height, advantage such as dynamic response is good.

The high voltage converter that possesses senior functions such as vector control and energy feedback simultaneously has been widely used in electric power, oil, petrochemical industry, metallurgical, chemical industry, municipal administration, supply water, the mine, coloured, cement, weaving, papermaking, printing and dyeing, boats and ships, a plurality of industries such as railway, improve in environmental protection and energy saving consciousness, under the driving of national policy promotion and business economic interests, the breadth and depth that high-pressure frequency-conversion is used is improved just day by day, industry enters explosive growth period, 66% of the generating total amount of China consumes on motor, according to predicting in " research of motor speed adjusting technique industrialization approach and countermeasure " that the potential market of high-pressure frequency-conversion is up to 1,015 hundred million yuan.

High voltage converter in the past, by silicon controlled rectifier, devices such as thyristor inversion constitute, and shortcoming is a lot, and harmonic wave is big, and is all influential to electrical network and motor.In recent years, some new devices that grow up will change this present situation, as IGBT, IGCT, SGCT or the like.By the high voltage converter that they constitute, excellent performance can be realized the PWM inversion, or even the PWM rectification.It is little not only to have harmonic wave, and power factor also has significant improvement.

Because high-voltage high-power frequency transformator every profession and trade is at home obtained gratifying energy-saving effect, become one of ten major projects that the National Development and Reform Committee emphasis promotes, but its input rectifying current harmonics is released and is become a harm greatly.The harm of harmonic wave is well-known, distribution cable, transformer harmonic wave make electrical network or fuel electric generator produce local parallel connection or series resonance easily, produce supplementary load loss, noise is increased, can cause adverse consequencess such as misoperations such as air switch, relay and contactor, generator surge, reduce generating, transmission facility utilance, harmonic wave also produces electromagnetic interference to surrounding environment, influence the operate as normal of communication quality and equipment, it is inaccurate that conventional electric meter is measured, thereby cause the severe contamination of electrical network.

The utility model content

Because the problems referred to above, the purpose of this utility model is to propose a kind of frequency converter that reduces toward the harmonic wave discharged rectifier transformer of electrical network, can reduce the pollution that high pressure high-performance big-power transducer is released to mains by harmonics.

A kind of 36 pulse high-power frequency conversion rectifier transformers of the utility model, the three-phase that comprises the employing Y connection of being located on the support is imported elementary winding and the secondary winding that adopts the phase shift of lengthened triangular connection, described secondary winding divides three groups, wherein each group comprises 6 phase shift groups, its phase shifting angle is respectively+and 25 °, + 15 °, + 5 °,-5 °,-15 °,-25 °, 10 ° of each phase shift group angular differences, whenever, form by several power unit cascades, mutual deviation is 10 ° between the adjacent phase of the secondary output of three-phase, and these 6 phase shift groups trigger controllable silicon by the different time sequential pulse controls of three-phase or device for power switching IGBT obtains positive and negative each 18 pulse wave; This each phase shift group has 3 taps, and then each group has the output line row that 18 tap correspondences are connected in support one side, has three groups of output line rows and is used to connect frequency converter.

A kind of 36 pulse high-power frequency conversion rectifier transformers of the utility model adopt multipleization design, and the middle pressure of frequency converter is resolved into the stack of many group voltage, make power device can select the device of low-voltage, high-current for use, reduce the frequency conversion device cost, improve the frequency converter reliability.This elementary winding adopts Y connection, coiled cartridge type coil; This secondary winding adopts disc coil, does to insulate between cake with bus clip, makes heat dissipation design obtain good effect, and the employing disc coil adds that being entangled with the transposition technology makes the short-circuit impedance value of 18 secondary winding formation more approaching effectively; The utility model can reach frequency converter＜5% current on line side harmonic wave releases, and compact conformation, volume are little, install simple, field wiring is few, debugging is convenient.

Description of drawings

Fig. 1 is that 36 pulse wave rectifiers of the present utility model become theory diagram;

Fig. 2 is an operation principle block diagram of the present utility model;

Fig. 3 is the series connection figure of phase-splitting power cell among Fig. 2;

Fig. 4 is a structural representation of the present utility model;

Fig. 5 is 36 pulse wave polar plots in the utility model;

Fig. 6 is the wiring schematic diagram of 6 phase shift groups and 18 power cells among a group in the utility model;

Fig. 7 to Figure 12 is respectively in the utility model among a group ± and 25 °, ± 15 °, ± 5 ° of phase shift phase angle schematic diagrames that vector is synthetic.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Embodiment

At multipleization, high pressure, frequency converter is AC-DC-AC type units in series voltage with multiple levels source variable-frequency governor, and 36 supporting with it pulse wave rectifier transformer principle block diagrams as shown in Figure 1.In order to obtain the high voltage of required certain numerical value, every output mutually of transformer 1 needs to be in series by a plurality of power cells 21, how much deciding of this power cell number on the voltage height, the utility model with every be 6 power cells mutually, totally 18 power cells of three-phase is an example, and each power cell bears whole current of electric, 1/6 phase voltage, 1/18 power output.These 18 power cells are total three-phase input winding on transformer 1.Reach mutually insulated between the transformer secondary winding 11 between this power cell.

As shown in Figure 2, transformer 1 of the present utility model adopts star Y connection at primary side, is three-phase input winding; Secondary side adopts the multiple outside the pale of civilization delta connection phase shift of prolonging, and purpose is to reduce the transducer power device voltage, strengthens its electric current, reduces complete machine frequency converter cost, reduces the input current harmonics composition.The secondary winding 12 of described transformer 1 is divided into a group, the group 2 of b group and three same structures of c group, present embodiment is that example illustrates with a group, wherein a group comprises 6 phase shift groups 22, its phase shifting angle is respectively+and 25 °, + 15 °, + 5 °,-5 °,-15 °,-25 °, 10 ° of each phase shift group 22 angular differences, whenever, form by 6 power unit cascades, as shown in Figure 3, then transformer 1 secondary side is every need 6 groups of secondary winding 12 mutually, three-phase output has 18 secondary winding and constitutes 36 pulse waves, and mutual deviation is 10 ° between the adjacent phase, and these 6 phase shift groups 22 trigger controllable silicon IGBT by the different time sequential pulse controls of three-phase, obtain positive and negative each 18 pulse wave, thereby obtain 36 pulse waves.As shown in Figure 5, wherein, prolong limit triangle connecting mode and be divided into positive sequence connection method and backward connection method.Because positive sequence connection method, its phase shifting angle is clockwise mode, is called negative angle; During backward connection method, its phase shifting angle is counterclockwise mode, is called positive-angle, no matter is positive sequence connection method, and still backward connection method is 0 ° during the knot triangle, the positive sequence connection can be called-0 °, inverted sequence connection method is called+and 0 °.

Below we study the phase shift of a group 2, as shown in Figure 6. among the figure right side label 1. to 6. be 6 adopt among three-phase phase shift group 22. figure that lengthened triangulars connect the A in a post, b post and the corresponding three-phase of c post mutually, B mutually with C mutually, with 1. phase shift group 22 is example, the left side is the wiring schematic diagram of 3 power cell u1a, v1a, w1a, 1,2,3 three wiring point is arranged among the power cell u1a, wiring point 1 is a tapping point, then each phase shift group 22 has 3 taps, there are 18 taps in a group 3, and transformer 1 just has 54 taps to offer the frequency converter connection.

Among a group 2 ± 25 °, ± 15 °, the phase shift phase angle of ± 5 ° of synthetic formations of vector such as Fig. 7 are to shown in Figure 12, calculate modulus, design its corresponding number of turn according to each phase shift angle, and press the different connections of Yd1 with Yd11, algebraical sum by phase angle obtains respectively ± and 25 °, ± 15 °, ± 5 ° of 6 groups of phase shift groups 22.Trigger controllable silicon IGBT by the different time sequential pulse controls of three-phase and then obtain positive and negative each 18 pulse wave, thereby obtain 36 pulse waves.

Shown in Figure 4, be structural representation of the present utility model.A kind of 36 pulse high-power frequency conversion rectifier transformers 1 of the utility model mainly comprise support 101, primary coil 102, secondary coil 103, iron core 104, the output line row of a group 105, the output line row of b group 106 and the output line row of c group 107; Described primary coil 102, secondary coil 103 and iron core 104 are formed three single-phase posts on support 101, this iron core 104 is by 7 rank mitre chipset sheets, and iron core column from the inside to surface, whenever folded different sheet arrays become, the direct high-frequency magnetic flux is uniform, can reduce iron loss, reduces the rectification noise; This primary coil 102 adopts Y connections, coiled cartridge type coil, and add vertical uniform stay and do air duct radiation; This secondary coil 103 adopts disc coil, stays the logical heat radiation of wind between cake, does to insulate between cake with bus clip 108, and this secondary coil 103 is pressed A, B, the segmentation coiling of three groups of C, and this disc coil short-circuit impedance in each group is approaching; Three groups at the corresponding secondary coil 103 of a side of support 101 are respectively equipped with the output line row of a group 105, the output line row of b group 106 and the output line row of c group 107, offer frequency converter and connect; Support 101 bottoms are provided with vanning support 109 and are convenient to vanning, convenient transportation; This vanning support 109 is provided with and lands universal wheel 110 that complete machine is being pushed away is mobile.

Have a little phase difference between each winding of secondary coil of the present utility model each other, this can eliminate most of harmonic currents that each power cell produces, thereby fundamental current is sinusoidal wave, and net side input power factor can remain on more than 0.95.

We study rectification circuit, draw the rectification circuit general formula by mathematical derivation:

$u_{\mathrm{d\α}}=U_{d0}[1-\underset{n=\mathrm{mk}}{\overset{\∞}{\mathrm{\Σ}}}\frac{2\cos \mathrm{k\π}}{n_2-1}\cos \mathrm{n\ωt}]$

When getting m=2, the substitution formula

$u_{\mathrm{da}}=\sqrt{2}{u}_2\frac{2}{\mathrm{\&pi;}}\sin \frac{\mathrm{\&pi;}}{2}[1+\frac{2}{2\&times;4}\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="H2009200594235E00011.png,H2009200594235E00012.png"\; state="\{\{state\}\}">cos</figure-callout>}2\mathrm{\&omega;t}+\frac{2}{3\&times;5}\mathrm{<figure-callout\; id="4"\; label="cos"\; filenames="H2009200594235E00011.png,H2009200594235E00051.png"\; state="\{\{state\}\}">cos</figure-callout>}4\mathrm{\&omega;t}+\frac{2}{5\&times;7}\mathrm{<figure-callout\; id="6"\; label="cos"\; filenames="H2009200594235E00011.png,H2009200594235E00051.png"\; state="\{\{state\}\}">cos</figure-callout>}6\mathrm{\&omega;t}+\mathrm{\&Lambda;}]$

Work as m=6, the substitution formula

$u_{\mathrm{da}}=\sqrt{2}{u}_{2\mathrm{<figure-callout\; id="6"\; label="L"\; filenames="H2009200594235E00011.png,H2009200594235E00051.png"\; state="\{\{state\}\}">L</figure-callout>}}\frac{6}{\mathrm{\&pi;}}\sin \frac{\mathrm{\&pi;}}{6}[1+\frac{2}{5\&times;7}\mathrm{<figure-callout\; id="6"\; label="cos"\; filenames="H2009200594235E00011.png,H2009200594235E00051.png"\; state="\{\{state\}\}">cos</figure-callout>}6\mathrm{\&omega;t}+\frac{2}{11\&times;13}\mathrm{<figure-callout\; id="12"\; label="cos"\; filenames="H2009200594235E00012.png,H2009200594235E00051.png"\; state="\{\{state\}\}">cos</figure-callout>}12\mathrm{\&omega;t}+\frac{2}{17\&times;19}\cos 18\mathrm{\&omega;t}+\frac{2}{23\&times;25}\cos 24\mathrm{\&omega;t}+\mathrm{\&Lambda;}]$

The increase of number of phases m makes that the frequency of minimum subharmonic increases in the harmonic wave as can be known from top expression formula, and its amplitude reduces rapidly simultaneously, and this conclusion has important directive significance to the heavy-duty rectifier structure choice.Launch to see two rectifier bridges from 12 pulse wave rectifier fourier series sorrows, harmonic wave is cancelled each other, only remaining 12K ± 1 time, K is a positive integer, to the only remaining 36K of 36 pulse waves ± 1 time, the above pulse wave of 36 pulse waves has not played much effects to the inhibition of harmonic wave, so select 36 pulse waves for use, can obtain maximum cost performance.

A kind of 36 pulse high-power frequency conversion rectifier transformers of the utility model adopt multipleization design, the middle pressure of frequency converter is resolved into the stack of many group voltage, make power device can select the device of low-voltage, high-current for use, reduce the frequency conversion device cost, improving the frequency converter reliability. this elementary winding adopts Y connection, coiled cartridge type coil; This secondary winding adopts disc coil, do to insulate between cake with bus clip, make heat dissipation design obtain good effect, the employing disc coil adds that being entangled with the transposition technology makes the short-circuit impedance value of 18 secondary winding formation more approaching effectively. the utility model can reach frequency converter＜5% current on line side harmonic wave and release, and compact conformation, volume are little, install simple, field wiring is few, debugging is convenient.

Claims (2)

1. pulse high-power frequency conversion rectifier transformer, the three-phase that comprises the employing Y connection of being located on the support is imported elementary winding and the secondary winding that adopts the phase shift of lengthened triangular connection, it is characterized in that: described secondary winding divides three groups, wherein each group comprises 6 phase shift groups, its phase shifting angle is respectively+and 25 °, + 15 °, + 5 °,-5 °,-15 °,-25 °, 10 ° of each phase shift group angular differences, whenever, form by several power unit cascades, mutual deviation is 10 ° between the adjacent phase of the secondary output of three-phase, and these 6 phase shift groups trigger controllable silicon by the different time sequential pulse controls of three-phase or device for power switching IGBT obtains positive and negative each 18 pulse wave; This each phase shift group has 3 taps, and then each group has the output line row that 18 tap correspondences are connected in support one side, has three groups of output line rows and is used to connect frequency converter.

2. a kind of 36 pulse high-power frequency conversion rectifier transformers according to claim 1 is characterized in that: this elementary winding adopts Y connection, coiled cartridge type coil; This secondary winding adopts disc coil, does to insulate between cake with bus clip.

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