CN1190278A - High-voltage large-power frequency convertor without power network pollution - Google Patents
High-voltage large-power frequency convertor without power network pollution Download PDFInfo
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- CN1190278A CN1190278A CN97100477A CN97100477A CN1190278A CN 1190278 A CN1190278 A CN 1190278A CN 97100477 A CN97100477 A CN 97100477A CN 97100477 A CN97100477 A CN 97100477A CN 1190278 A CN1190278 A CN 1190278A
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- 230000001939 inductive effects Effects 0.000 claims abstract description 12
- 239000003365 glass fibers Substances 0.000 claims abstract description 11
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Abstract
The frequency convertor consists of multiple-section shift transformer, triphase induction motor, IGBT AC-DC-AC bridge, optical fibre waveform driving and protecting circuit, host computer, accessory computer, programmable control and failure diagnosing PLC, interface, etc. The new large-power frequency convertor is tend to manufacture by using IGBT device, which has small driving power, large switch safety area and less requirement to other device and is easy to realize short- circuit protection. Using the softward technology of multi-level superposing to optimize PWM waveform makes the frequency convertor reliable, controllable, low in loss, good in waveform and no power network pollution.
Description
The present invention relates to a kind of direct high voltage frequency converter, relate to a kind of high-voltage large-power frequency convertor without power network pollution.
Global energy crisis has caused that various countries more and more pay close attention to power-saving technology.The energy-consuming of China has been listed as lance before the world, and wherein most important reason is exactly that the energy consumption per unit of output value is too big.As: account for commercial power all kinds of blower fans over half, pump class, because the long-term constant-speed drive that adopts has caused the waste of a large amount of energy.In physics
This formula if realize variable-speed operation with speed adjusting technique, can be realized energy-conservation.Therefore, the speed governing converter plant of developing large, medium and small power just seems particularly important.With regard to present technical merit, common in, low power frequency converter has formed industrialization, and also there are a lot of problems in the production of high-voltage high-power frequency transformator development, with regard to the variable-frequency governor of present existing several types, its problem and defective thereof are as follows:
1, adopts the controllable silicon DC motor speed-regulating.This device is used for steel and iron industry more, though its manufacturing technology is tending towards maturation, the workload in the maintenance of motor process is very big, and controllable silicon is serious to electric network pollution.
2, controllable silicon frequency changer circuit frequency-changing speed-regulating, this converter plant price is expensive, device is complicated, and the analog control mode reliability is low, and is very big to electric network pollution, therefore needs additional expensive and huge electrical network filter.
3, use the silicon controlled thyristor frequency conversion device of step-down-common frequency conversion-boost.This device is that volume is doted on greatly, cost is high, loss is big equally, big to electric network pollution, also need to install additional filter.
4, adopt the GTO frequency converter.This frequency converter is safeguarded complexity owing to cost an arm and a leg, and therefore can only be used on the only a few key project, does energy-conservation popularization and can't popularize because of valency is high.
5, adopt GTO or SCR device.This converter plant is to utilize the conventional high-tension device, again by series connection dynamic voltage balancing technology, thereby obtains high voltage output.This converter plant is owing to adopted the multi-level high-voltage series connection, and equilibrium is very difficult, and is very high to the requirement of electric capacity and clamping diode.Simultaneously this device is very big to electric network pollution, must use expensive line filter, problem such as cause therefore that system is huge excessively, difficult in maintenance, easy break-down, cost are high.
The objective of the invention is to design a kind of to electrical network and to all free of contamination big-power transducer of motor.
For achieving the above object; the present invention takes following design: high-voltage large-power frequency convertor without power network pollution is handed over orthogonal unit bridges, compositions such as the PLC of optical fiber drive waveform and protective circuit, main control computer, secondary computer, control able to programme and ruling fault and control interface circuit by multistage phase shift main transformer, three-phase induction motor, IGBT.Described main transformer is phase shift, segmentation, equal die mould transformer, it has adopted the tortuous winding of Y-△, make the secondary output winding phase place of main transformer be respectively 0 °, ± 12 °, ± 24 °, the output winding with this phase place connects each IGBT respectively and hands over orthogonal unit bridges; Adopt the join IGBT unit bridges of mode of 3,5,7,9 grades of polyphones to connect induction machine A, B, C three-phase terminal; Simultaneously, uplink and downlink optical fiber drive controlling and protection are adopted in each group IGBT unit bridges output; The two-way connection of described main control computer, PLC and secondary computer and by software and interface circuit control IGBT output signal, thus realize that IGBT low pressure low power frequency conversion device phase-splitting serial connection becomes the purpose of high-voltage high-power frequency transformator.
Adopt the big-power transducer of IGBT element manufacturing to represent the developing direction of novel high-pressure big-power transducer from now on, the driving power of IGBT is little, and the switch safety zone is big, easily realizes short-circuit protection, to device require low.In this frequency converter, adopted software take place to optimize many level of PWM waveform superimposing technique, IGBT have reliability height, control easily, loss is little, waveform is good characteristics, therefore very suitablely make big-power transducer with IBGT.The problem that is difficult to dynamic voltage balancing when but this low voltage frequency converter group series system abatement device is directly connected simultaneously.In addition, in this frequency converter transformer adopting particular design and manufacturing process, make the transformer that has rectification load have High Power Factor, low harmonic characterisitic, existing step-down buffer action has the function that replaces expensive line filter again.Adopt high withstand voltage optical fiber to drive among the present invention, make digital control part energy trouble free service.Another characteristics of the present invention are hardware components modularization, standardization, but the batch process of standard ground.Control by special-purpose software and the work allocation in the system, detection, switching, protection are many.In circuit design, owing in each IGBT element circuit the bypass electric bridge is housed all, just in case break down, circuit can automatically switch, and need not shut down, stop production.Many level PWMs have realized that the harmonic wave total amount is lower than 1.2% to electric phase pure sinusoid output current wave, (voltage, electric current); motor there are not heating of additional harmonic wave and winding overvoltage etc., the IGBT power cell in the circuit, every all have redundancy backup mutually; need not shut down safe operation continuously.Adopt master computer and standby redundancy secondary computer, all increased the reliability of system.
Fig. 1 is electric connection figure of the present invention
Fig. 2 is the main ripple and the harmonic content figure of IGBT-phase among the present invention
Fig. 3 is for being combined to back harmonic content figure for IGBT three among the present invention
Fig. 4 is for being IGBT one unit PWM oscillogram among the present invention
Fig. 5 is for being IGBT two unit PWM oscillograms among the present invention
Fig. 6 is for being IGBT three unit PWM oscillograms among the present invention
Fig. 7 is for being IGBT four unit PWM oscillograms among the present invention
Fig. 8 is for being IGBT five unit PWM oscillograms among the present invention
Fig. 9 is the voltage oscillogram after synthesizing for IGBT Unit five among the present invention
Figure 10 is the protective circuit figure of IGBT element circuit among the present invention
Be superposed to example below in conjunction with accompanying drawing and with many level PWMs (pulse-width modulation) of Pyatyi unit mode, specify as follows:
As shown in Figure 1, high-voltage large-power frequency convertor without power network pollution hands over the PLC6 of orthogonal unit bridges A1-A5, B1-B5, C1-C5, optical fiber drive waveform and protective circuit 3, main control computer 4, secondary computer 5, control able to programme and ruling fault and control interface circuit 7 etc. to form by main transformer 1, three-phase induction motor 2, IGBT.Described main transformer 1 is for the three-phase misphase, all press multiple phase shifting transformer.It adopts the tortuous winding of Y-△, make 15 mutual misphases of output winding of transformer secondary, phase place is respectively: 0 °, ± 12 °, ± 24 ° each three groups, the transformer of this band rectifier load, have High Power Factor (＞0.95), low harmonic characterisitic not only has the effect that step-down is isolated, also can eliminate harmonic pollution in electric power net (being lower than 1%), can replace expensive line filter.
Above-mentioned 15 winding outputs all connect an IGBT and hand over the orthogonal single-phase bridge, and they are respectively A1-A5, B1-B5, C1-C5.IGBT can adopt three, five, seven, nine grades of serial connection modes.In the present embodiment, IGBT adopts the Pyatyi series system.Five IGBT of A unit are promptly: A1-A5, and the serial connection back connects the A phase connection terminal of induction machine 2 mutually; Five IGBT of B unit are promptly: B1-B5, and the serial connection back connects the B phase connection terminal of induction machine 2 mutually; Five IGBT of C unit are promptly: C1-C5, and the serial connection back connects the C phase connection terminal of induction machine 2 mutually; And the other end of A, B, C unit interconnects.
The unit output of each group IGBT is by optical fiber 3 (uplink and downlink) drive controlling and protection, and the other end of optical fiber 3 is connected with control connection interface circuit 7.Master control computer 4, secondary computer 5, control able to programme and mutual two-way serial connection of the PLC6 of ruling fault, its control signal exports control interface circuit 7 to by main control computer 4.
Fig. 2-Fig. 3 provides IGBT one phase, and three main ripple, harmonic content figure after being combined to, PWM (pulse-width modulation) oscillogram after Fig. 4-Fig. 9 provides unit, Unit 1-5 and Unit 5 synthetic.By above-mentioned waveform as can be known, frequency converter of the present invention adopts software that many level PWM stacks take place, and has realized continuous frequency conversion and voltage transformation under the high pressure (0-60 hertz, 0-rated voltage 3300-6600V) speed governing, and has not needed the adapted motor special.From above-mentioned figure also as can be known, many level PWMs have been realized electric phase pure sinusoid output current wave, make the harmonic wave total amount be lower than 1.2% (voltage, electric current).
In Figure 10,8 is that IGBT hands over, straight, the first bridge circuit of presentate, is connected with road and bridge on one side at the output of bridge, and this bypass bridge is a protective circuit, is made up of rectifier diode 9-12 and controllable silicon 13.Wherein diode 9-12 is a bridge circuit, and the bridge circuit two ends are parallel with controllable silicon 13.
The IGBT power cell is every in the present invention all redundancy backup mutually, and each group IGBT all is equipped with above-mentioned protective circuit, in case IGBT be damaged, protective circuit work, but need not shut down still safe operation.
Claims (5)
1, a kind of high-voltage large-power frequency convertor without power network pollution; hand over the orthogonal unit bridges by multistage phase shift main transformer, three-phase induction motor, IGBT; compositions such as the PLC of optical fiber drive waveform and protective circuit, main control computer, secondary computer, control able to programme and ruling fault and control interface circuit is characterized in that:
Described main transformer (1) is phase shift, segmentation, equal die mould transformers, and its adopts the tortuous winding of Y-△, its secondary output winding phase place be respectively 0 °, ± 12 °, ± 24 °;
The output winding of above-mentioned transformer (1) connects IGBT respectively and hands over orthogonal unit bridges (A1-A5, B1-B5, C1-C5);
Adopt the join IGBT unit bridges of mode of three, five, seven, nine grades of polyphones to connect A, B, C three-phase terminal of induction machine (2) respectively;
Uplink and downlink optical fiber (3) drive controlling and protection are adopted in each group IGBT unit bridges output;
Main control computer (4), PLC (6) and the two-way serial connection of secondary computer (5), main control computer (4) connects software and interface circuit (7).
2, high-voltage large-power frequency convertor without power network pollution according to claim 1 is characterized in that: five IGBT of A unit promptly: (A1-A5), mutually the serial connection back connects the A phase connection terminal of induction machine (2); Five IGBT of B unit are promptly: (B1-B5), the serial connection back connects the B phase connection terminal of induction machine (2) mutually; Five IGBT of C unit are promptly: (C1-C5), the serial connection back connects the C phase connection terminal of induction machine (2) mutually, and the other end of (A, B, C) unit interconnects.
3, high-voltage large-power frequency convertor without power network pollution according to claim 1 is characterized in that: the unit output of each group IGBT is by uplink and downlink optical fiber (3) drive controlling and protection, and the other end of optical fiber (3) is connected with control interface circuit (7).
4, high-voltage large-power frequency convertor without power network pollution according to claim 1 is characterized in that: IGBT hands over, output straight, presentate phase bridge circuit (8) connects road and bridge on one side, and this bypass bridge is made up of rectifier diode (9-12) and controllable silicon (13).
5, high-voltage large-power frequency convertor without power network pollution according to claim 4 is characterized in that: diode (9-12) is formed bridge circuit, and the bridge circuit two ends are parallel with controllable silicon (13).
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| CN97100477A CN1060599C (en) | 1997-02-03 | 1997-02-03 | High-voltage large-power frequency convertor without power network pollution |
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| CN97100477A CN1060599C (en) | 1997-02-03 | 1997-02-03 | High-voltage large-power frequency convertor without power network pollution |
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| CN100380799C (en) * | 2004-11-10 | 2008-04-09 | 广州智光电机有限公司 | Electric contravariant system main loop topological structure with short-circuit protection and constituting method thereof |
| CN100385782C (en) * | 2000-12-27 | 2008-04-30 | 艾默生网络能源有限公司 | Multiple-level serially connected high-voltage inverter |
| CN101860232A (en) * | 2010-03-29 | 2010-10-13 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| CN102882382A (en) * | 2012-10-07 | 2013-01-16 | 叶露微 | Power-frequency power supplied electromagnetic device capable of running at magnetic flux frequency lower than power frequency |
| US8619446B2 (en) | 2012-04-27 | 2013-12-31 | Rockwell Automation Technologies, Inc. | Cascaded H-bridge (CHB) inverter level shift PWM with rotation |
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| CN101098107B (en) * | 2006-06-28 | 2010-05-12 | 北京利德华福电气技术有限公司 | High-voltage frequency converter of power unit series |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6450763A (en) * | 1987-08-21 | 1989-02-27 | Fuji Electric Co Ltd | Two-multiplex polyphase cycloconverter |
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1997
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| CN101860232A (en) * | 2010-03-29 | 2010-10-13 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| CN101860232B (en) * | 2010-03-29 | 2012-08-08 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| US8619446B2 (en) | 2012-04-27 | 2013-12-31 | Rockwell Automation Technologies, Inc. | Cascaded H-bridge (CHB) inverter level shift PWM with rotation |
| US8982593B2 (en) | 2012-04-27 | 2015-03-17 | Rockwell Automation Technologies, Inc. | Cascaded H-Bridge (CHB) inverter level shift PWM with rotation |
| US9912221B2 (en) | 2012-08-13 | 2018-03-06 | Rockwell Automation Technologies, Inc. | Method and apparatus for bypassing cascaded h-bridge (CHB) power cells and power sub cell for multilevel inverter |
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| CN102882382A (en) * | 2012-10-07 | 2013-01-16 | 叶露微 | Power-frequency power supplied electromagnetic device capable of running at magnetic flux frequency lower than power frequency |
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Address after: 611731 No. 2, Tian Lang Road, Chengdu hi tech Industrial Development Zone, Sichuan, China Co-patentee after: Lidehuafu Technology Co., Ltd., Beijing Patentee after: Dongfang Hitachi (Chengdu) Electrical Control Apparatus Co., Ltd. Address before: 610041 Chengdu high tech Development Zone West 1008 mailbox Co-patentee before: Lidehuafu Technology Co., Ltd., Beijing Patentee before: Dongfang Kaiqi Electric Co., Ltd., Chengdu |
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