CN1610453A - 24 pulse wave rectifier large power variable frequency induction smelting system - Google Patents
24 pulse wave rectifier large power variable frequency induction smelting system Download PDFInfo
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- CN1610453A CN1610453A CN 200410065520 CN200410065520A CN1610453A CN 1610453 A CN1610453 A CN 1610453A CN 200410065520 CN200410065520 CN 200410065520 CN 200410065520 A CN200410065520 A CN 200410065520A CN 1610453 A CN1610453 A CN 1610453A
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- thyristor
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Abstract
The great power frequency variable smelting system has two rectifying transformers with two secondary windings each, four semiconductor power rectifier circuits connected separately to the secondary windings to produce DC current output fed to two parallel inverters, four thyristors in the two inverters, two compensation capacitors connected parallelly to the thyristors, and large inducing furnace with inducing coil connected parallelly to the compensation capacitors. The present invention has the advantages of low harmonic current without harm to power network, low apparatus cost and low running cost.
Description
Technical field
What the present invention relates to is a kind of high-power frequency conversion smelting system that is used for 24 pulse wave rectifiers of heavy castings production, is intended to improve Harmonic Interference and raising net side power factor to electrical network.Belong to the converter plant technical field.
Background technology
Prior art adopts the frequency converter of 12 pulse wave rectifiers to power to induction furnace, the frequency converter of this pulse wave rectifier still has 11,13 subharmonic to pollute to electrical network, its amplitude is respectively 9.1%, 7.6% of a first-harmonic, national regulation is 1500KVA at the permission access capacity of 10KV electrical network, and the capacity that the user needs is promptly more than 6000KW.
Summary of the invention
The objective of the invention is to defective, propose a kind of large power variable frequency induction smelting system of 24 pulse wave rectifiers of novel structure at above-mentioned existence.Split with two 12 pulse waves with transformer and to be combined into 24 pulse wave rectifier systems, thereby satisfy user's needs of the above capacity of 6000KW.Technical solution of the present invention: on four groups of secondary of two cover rectifier transformers each and connect two cover semiconductor power rectification circuits, the output of quadruplet semiconductor power rectification circuit is connected in series big reactor filtering respectively, is current filtering that straight direct current is exported to two groups of parallel-type converters, four thyristors in the parallel-type converter and contact; The two ends of two building-out capacitors respectively and receive on the thyristor and contact in the parallel-type converter, the induction coil of large-tonnage stove and receive compensation condenser or the another compensation condenser on.
Satisfy 24 pulse wave rectifier requirements on the phase sequence of the winding of split phase type rectifier transformer, the phase place.The phasor difference is 15 ° between each adjacent voltage of two corresponding windings of rectifier transformer secondary.
Advantage of the present invention: its minimum harmonic electric current is 23 times, 25 times, and 4.4%, the 4.0% total current aberration rate that only accounts for fundamental current only is 5.9%, can not cause harmonic wave harm to electrical network.Reduce the capacity of every cover rectification circuit, be beneficial to complete sets of equipment production.Adopt this patent project can exempt harmonic wave absorption plant and reactive power compensator are set, can save this cost of equipment and operating cost thereof in the net side.
Description of drawings
Fig. 1 is the frequency conversion one smelting system major loop figure of 24 pulse wave rectifiers,
Fig. 2 is the winding phasor graphs of a relation of 24 pulse waves with rectifier transformer,
Fig. 2-a among Fig. 2 is phase sequence, the phase diagram of the former secondary winding of rectifier transformer.
Fig. 2-b among Fig. 2 is former secondary voltage phasor diagram.
Fig. 2-c among Fig. 2 is the voltage phasor graph of a relation of secondary winding
Fig. 3 is a phase current waveform figure of the total bus in the former limit of the rectifier transformer of 24 pulse wave rectifiers,
Fig. 4 is a phase current waveform figure of the former edges generating line of rectifier transformer of 12 pulse wave rectifiers
Fig. 5 is the bind mode schematic diagram of inverter circuit,
SW1 among Fig. 1, SW2-high-voltage switch gear, the low-side switch of SW3, SW4, SW5, SW6-rectifier transformer, RT1, many windings of RT2-split phase type rectifier transformer, CON1---CON4-semiconductor power rectification circuit, DCC1-DCC8-dc flat-wave reactor, INV1, INV2-power converter, C
0-compensation condenser, F-large-tonnage electric melting furnace.
Current waveform when a ' among Fig. 3 is the Y/Y connection; Current waveform when b ' is Y/ Δ connection; C ' is the Y/ Δ, and Y connection waveform is a ' and b ' resultant current, and two group of six pulse wave rectifier synthesizes 12 postsphygmic current waveforms.
Th1 among Fig. 5, th2, th3, th4, th5, th6, th7, th8, th9, th10, th11, th12, th13, th14, h15, th16, th ' 1, th ' 2, th ' 3, th ' 4, th ' 5, th ' 6, th ' 7, th ' 8, th ' 9, th ' 10, th ' 11, th ' 12, th ' 13, th ' 14, th ' 15, th ' the 16th, thyristor (model KK)
Concrete execution mode
Contrast accompanying drawing 1, by on the secondary of rectifier transformer RT1 and meet semiconductor power rectification circuit CON1～CON2, by on the secondary of rectifier transformer RT2 and meet semiconductor power rectification circuit CON3～CON4, semiconductor power rectification circuit CON1, CON2, CON3, the output of CON4 connects big reactor filtering respectively, is current filtering that straight direct current is exported to two groups of parallel-type converter 1NV1 or parallel-type converter 1NV2, two groups of parallel-type converter INV1 or parallel-type converter INV2 are made of the thyristor th1 after the serial connection respectively 16 thyristors (model is KK), th2, th13, thyristor th ' 1 after th14 or the serial connection, th ' 2, th ' 13, th ' 14 with connect after thyristor th3, th4, th15, thyristor th ' 3 after th16 or the serial connection, th ' 4, th ' 15, th ' 16 also connects; Thyristor th ' 9, th ' 10, th ' 5, th ' 6 after thyristor th9, th10 after the serial connection, th5, th6 or the serial connection be connected in series after thyristor th11, th12, th7, th8 or be connected in series after thyristor th ' 11, th ' 12, th ' 7, th ' 8 and connect, upper end and contact A or the A ' of two groups of parallel-type converter INV1 or parallel-type converter INV2, lower end and contact B or B ' respectively and receive four big reactors and contact on; Thyristor and contact C or thyristor and contact C ', thyristor and contact D or thyristor and contact D '; Building-out capacitor C
0Two ends respectively and receive thyristor and contact C or thyristor and contact C ', building-out capacitor C
0' two ends respectively and receive thyristor and contact D or thyristor and contact D ', the induction coil L of large-tonnage stove
0And receive building-out capacitor C
0Or building-out capacitor C
0' on.
Satisfy 24 pulse wave rectifier requirements on the phase sequence of the winding of split phase type rectifier transformer, the phase place.The phasor difference is 15 ° between each adjacent voltage of two corresponding windings of rectifier transformer secondary.
The course of work
Phase relation by the three-phase voltage of two secondary of rectifier transformer RT1 or rectifier transformer RT2:
The input voltage of semiconductor power rectification circuit CON2 lags behind 30 ° of el of input voltage of semiconductor power rectification circuit CON1 on phase place;
The input voltage of semiconductor power rectification circuit CON4 lags behind 30 ° of el of input voltage of semiconductor power rectification circuit CON3 on phase place;
The input voltage of semiconductor power rectification circuit CON3 lags behind 15 ° of el of input voltage of semiconductor power rectification circuit CON1 on phase place;
The input voltage of semiconductor power rectification circuit CON4 lags behind 15 ° of el of input voltage of semiconductor power rectification circuit CON2 on phase place;
Like this, the input current of semiconductor power rectification circuit CON1, CON2 synthesizes 12 pulse wave electric currents on the former limit of rectifier transformer RT1; Semiconductor power rectification circuit CON3, the input current of CON4 synthesizes 12 pulse wave electric currents on the former limit of rectifier transformer RT2.The former limit of two rectifier transformers just synthesizes the electric current of 24 pulse waves.
Semiconductor power rectification circuit CON1, CON2, CON3, CON4, through big reactor filtering, be current filtering straight direct current respectively, respectively to shunt chopper 1NV1 or 1NV2 power supply, after inversion, direct current is transformed into the alternating current of the frequency that requires, and the induction coil of electric furnace F is under the effect of frequency-changing AC electric current, produce alternating flux, metal works in the electric furnace produces eddy current and generates heat, and heats up, until fusing.
Three-phase six pulse wave semiconductor power rectification circuit CON1～CON4, its each group rectification circuit is made up of six thyristors (its model is KP), its output big reactor of respectively connecting, the output of reactor greatly is in the same polarity mode and connect.
Claims (4)
1, the large power variable frequency induction smelting system of 24 pulse wave rectifiers, it is characterized in that by on the secondary of rectifier transformer (RT1) and meet semiconductor power rectification circuit (CON1, CON2), by on the secondary of rectifier transformer (RT2) and meet semiconductor power rectification circuit (CON3, CON4), semiconductor power rectification circuit (CON1, CON2, CON3, CON4) output connects big reactor filtering respectively, is current filtering that straight direct current is exported to parallel-type converter (1NV1) or parallel-type converter (1NV2), thyristor and contact (C in parallel-type converter (INV1) or the parallel-type converter (INV2), C ', D, D '); The two ends of building-out capacitor (C0) respectively and receive thyristor in the parallel-type converter (INV1) and the thyristor in contact (C) or the parallel-type converter (INV2) and contact (C '), the two ends of building-out capacitor (C0 ') respectively and receive (D) in thyristor and the contact parallel-type converter (INV1) or the thyristor in the parallel-type converter (INV2) and contact (D '), the induction coil (L of large-tonnage stove
0) and receive building-out capacitor (C
0) or building-out capacitor (C
0') on.
2, the large power variable frequency induction smelting system of 24 pulse wave rectifiers according to claim 1, it is characterized in that two groups of parallel-type converter INV1 or INV2 are made up of 16 thyristors respectively, the thyristor (th ' 1, th ' 2, th ' 13, th ' 14) after thyristor after the serial connection (th1, th2, th13, th14) or the serial connection with connect after thyristor (th3, th4, th15, th16) or be connected in series after thyristor (th ' 3, th ' 4, th ' 15, th ' 16) and connect; Thyristor (th ' 9, th ' 10, th ' 5, th ' 6) after thyristor after the serial connection (th9, th10, th5, th6) or the serial connection be connected in series after thyristor (th11, th12, th7, th8) or be connected in series after thyristor (th ' 11, th ' 12, th ' 7, th ' 8) and connect, the upper end of two groups of parallel-type converters (INV1, INV2) and contact (A or A '), lower end and contact (B or B ') respectively and receive four big reactors and contact on.
3, the large power variable frequency induction smelting system of 24 pulse wave rectifiers according to claim 1, it is characterized in that the input voltage of semiconductor power rectification circuit (CON2) lags behind 30 ° of el of input voltage of semiconductor power rectification circuit (CON3) respectively respectively at the input voltage of 30 ° of el of the input voltage that lags behind semiconductor power rectification circuit (CON1) on the phase place and semiconductor power rectification circuit (CON4) on phase place.
4, the large power variable frequency induction smelting system of 24 pulse wave rectifiers according to claim 1, it is characterized in that satisfying 24 pulse wave rectifier requirements on the phase sequence, phase place of the winding of split phase type rectifier transformer, the phasor difference is 15 ° between each adjacent voltage of two corresponding windings of rectifier transformer secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100655207A CN100502217C (en) | 2004-11-22 | 2004-11-22 | 24 pulse wave rectifier large power variable frequency induction smelting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100655207A CN100502217C (en) | 2004-11-22 | 2004-11-22 | 24 pulse wave rectifier large power variable frequency induction smelting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1610453A true CN1610453A (en) | 2005-04-27 |
| CN100502217C CN100502217C (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100655207A Active CN100502217C (en) | 2004-11-22 | 2004-11-22 | 24 pulse wave rectifier large power variable frequency induction smelting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521468B (en) * | 2008-11-14 | 2010-09-29 | 浙江大学 | High-frequency three-phase medium-voltage power supply rectifier |
| CN110444371A (en) * | 2019-07-17 | 2019-11-12 | 孙崇山 | Wire current contrary distribution core type smoothing reactor |
-
2004
- 2004-11-22 CN CNB2004100655207A patent/CN100502217C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521468B (en) * | 2008-11-14 | 2010-09-29 | 浙江大学 | High-frequency three-phase medium-voltage power supply rectifier |
| CN110444371A (en) * | 2019-07-17 | 2019-11-12 | 孙崇山 | Wire current contrary distribution core type smoothing reactor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100502217C (en) | 2009-06-17 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Suzhou Zhenwu Electric Furnace Co., Ltd. Assignor: Zhu Xingfa Contract fulfillment period: 2009.7.1 to 2014.6.30 contract change Contract record no.: 2009320001258 Denomination of invention: 24 pulse wave rectifier large power variable frequency induction smelting system Granted publication date: 20090617 License type: Exclusive license Record date: 2009.7.27 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.7.1 TO 2014.6.30; CHANGE OF CONTRACT Name of requester: SUZHOU ZHENWU ELECTRIC STOVE CO., LTD. Effective date: 20090727 |