CN101369780B - Unit bypass apparatus and control method of unit cascading high voltage frequency converter - Google Patents
Unit bypass apparatus and control method of unit cascading high voltage frequency converter Download PDFInfo
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- CN101369780B CN101369780B CN2007100529547A CN200710052954A CN101369780B CN 101369780 B CN101369780 B CN 101369780B CN 2007100529547 A CN2007100529547 A CN 2007100529547A CN 200710052954 A CN200710052954 A CN 200710052954A CN 101369780 B CN101369780 B CN 101369780B
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Abstract
The invention discloses a unit by-path apparatus for a unit cascade high voltage frequency converter, and control method thereof, wherein a by-path centralized control board being connected with a main circuit control board and an isolation transformer separately; the other end of the isolation transformer being connected with a by-pass contactor which is connected with an unit output. The by-pass apparatus is composed of a main circuit control board, a by-path centralized control board, an isolation transformer, and a by-path contactor. The method includes the steps of transferring a unit fault signal to the main circuit control board firstly; cutting off the main circuit current; thirdly, the by-path centralized control board transmitting a by-path contactor motion completion signal to the main circuit control board; fourthly, the main circuit control board transmitting IGBT control signal based on the acquisition motor backemf. The apparatus of the invention has a simple structure, and can cut off the failure unit by path completely reliably, eliminate the error and refused onstate of other type by-pass systems, and assure the safe and reliable motion of the whole by-pass method.
Description
Technical field
The invention belongs to electric and electronic technical field.More specifically be a kind of unit bypass device of unit series connection type high voltage frequency convertor, be applicable to any similar units tandem arrangement, also relate to a kind of control method of shunting device simultaneously.
Background technology
Along with the extensive use of high voltage converter, the reliable and stable operation of high voltage converter is had higher requirement in occasions that counts for much such as electric power, metallurgy, oil, chemical industry.Present stage, the high voltage converter main circuit generally adopted the power unit cascade technology, have that harmonic wave is little, the unit is interchangeable, can produce in batches, advantage such as easy to maintenance, yet some or several power cells break down in running and will cause whole frequency converter normally not move, even jumping machine, make the functional reliability of high voltage converter reduce greatly, not only brought great hidden danger, also can bring immeasurable economic loss simultaneously to the user to production safety.Adopt the power unit by-pass device, when the unit breaks down,, adjust fault-free cell operation state, make high voltage converter can continue operation, the operational reliability and the fail safe that have improved high voltage converter greatly effectively with the trouble unit excision.
The bypass circuit that present most of high voltage converter adopts is made of the diode rectifier bridge that is arranged on output next door, unit and thyristor or other similar electronic switching devices that (rectifier bridge is not traditional rectified action herein, but provide the two-way admittance passage) to electric current, the interchange input two ends of this rectifier bridge link to each other with unit output, and direct current output two ends link to each other with thyristor.When the unit breaks down, block the driving pulse of inverter bridge, trigger thyristor simultaneously, make the by-pass mistake that the phase current of place, unit phase is formed through diode rectifier bridge and thyristor, this moment, trouble unit was excised by bypass, this shunting device is simple in structure, volume is little, in light weight, easy to maintenance, however there is following problem: one, when cell power switching device IGBT control impuls is blocked or power cell output voltage when being zero level, thyristor both end voltage in the shunting device is zero, this moment, the direct voltage of power cell can directly be added in negative and positive the two poles of the earth of thyristor if control IGBT makes power cell output that level be arranged, and made thyristor bear the dv/dt that surpasses its tolerance, easily cause it to mislead, cause the short trouble of power cell.Two, because shunting device and power cell device are formed by the electronic switch device, has the common defective of product of the same type, as the scaling loss of a certain device when the overvoltage and also scaling loss in same environment very likely of another device makes the whole system reliability reduce.Three, by the control of unit controls plate, when the unit controls plate broke down, this unit was a cisco unity malfunction mostly in current bypass, also can't be by unit control board control bypass.
Summary of the invention
The present invention seeks to be to provide a kind of unit bypass device of unit series high-voltage frequency converter, apparatus structure is simple, the excision of bypass safely and reliably trouble unit, the hidden danger that the bypath system of elimination other types misleads and refuses conducting.
Another object of the present invention is the control method that is to provide a kind of unit bypass device of unit series high-voltage frequency converter.This method adopts the firm and hard existing control of bypass centralized control, and is simple in structure, easy to maintenance.This method has guaranteed whole by-pass method safety (non-impact current or switching overvoltage) action message simultaneously.
For achieving the above object, technical scheme of the present invention is: shunting device mainly comprises main circuit control board, bypass centralized control plate, bypass contactor, isolating transformer and Bypass Control program.Described bypass centralized control plate links to each other with main circuit control board, isolating transformer primary side respectively; The isolating transformer secondary is surveyed and is linked to each other with bypass contactor, and bypass contactor links to each other with corresponding power cell simultaneously.
Described main circuit control board is the embedded system based on a kind of chip (as FPGA, DSP, ARM or single-chip microcomputer), or has a control system of equal calculation process ability, it and other auxiliary equipment communications, be responsible for the processing and the output of whole inverter control signal, comprising the processing and the output of by-passing signal.The main circuit control board receives fault-signal from trouble unit, need to judge whether bypass, when needing bypass control signal is sent to bypass centralized control plate with communication modes, the plate of bypass centralized control in addition feedback contactor status signal is to the main circuit control board, main circuit control board and bypass centralized control plate adopt optical fiber serial communication mode, but actually be not limited to optical-fibre communications, the advantage of optical-fibre communications is that bypass centralized control plate and main circuit control board are implemented electrical isolation, has reduced electrical Interference between two plates.Traditional bypass is to be moved by the firm and hard Bypass Control of executing of unit controls, and the present invention adopts independently bypass centralized control plate, simple in structure, easy to maintenance, and solved the problem that the unit controls plate dead electricity that causes because of the power device fault or the fault of unit controls plate own can not effectively be excised.
Bypass centralized control plate is mainly by the opto-electronic conversion chip, control chip, and chip for driving, relay constitutes.Opto-electronic conversion chip one end links to each other with the main circuit control board by optical fiber, and the other end links to each other with control chip.Use two opto-electronic conversion chips, accept the light signal of main circuit control board and be converted into the signal of telecommunication for one to be sent to control chip, another signal of telecommunication with control chip is converted into optical signal transmission to the main circuit control board.The signal that control chip sends according to master control is responsible for judging the title of required by-pass unit, then bypass control signal is outputed to and the corresponding chip for driving of required by-pass unit, the chip for driving signal output part links to each other with corresponding relay control end own, relay output on the bypass centralized control plate links to each other with corresponding isolating transformer primary side as the control output of bypass centralized control plate, and the isolating transformer secondary side links to each other with the control coil of corresponding bypass contactor.Bypass contactor has two passages, normally closed contact passage and normal opened contact passage, and the normally closed contact passage is connected normal opened contact passage and units corresponding output-parallel with units corresponding output.Bypass centralized control plate links to each other by isolating transformer with contactor, not only can adjust voltage makes the control coil required voltage of control voltage and contactor be complementary, and make high tension apparatus such as bypass centralized control plate and contactor that electrical isolation be arranged, guaranteed the trouble free service of bypass centralized control plate.
Whole shunting device adopts effective control program, guarantees that trouble unit is excised by bypass safely and reliably.Step is as follows:
A: the cell failure signal is delivered to the main circuit control board, and the main circuit control board need to judge whether the excision trouble unit, when needs excise, preserves current high voltage converter output voltage amplitude U earlier
0With frequency F
0, successfully excise the back frequency converter in order to trouble unit and recover to use when normally exporting.
B: according to u=L di/dt, for preventing the switching overvoltage in the contactor course of action, cut off main circuit current, the main circuit control board blocks the power switch control signal of whole unit immediately, and then the by-passing signal that sends trouble unit makes the contactor of trouble unit correspondence move to bypass centralized control plate.
C: wait for that certain hour (decide by selected contactor, is chosen as generally that 200ms～400ms), the bypass contactor action is finished, and bypass centralized control plate sends corresponding contactor and moves the completion status signal to the main circuit control board by the concrete time.The main circuit control board enters the state that preparation resends the drive control signal of each cell power switching device immediately afterwards.
D: the inconsistent impulse current that causes of back electromotive force that resends high voltage converter output voltage and motor load after the pulse for elimination, the main circuit control board must be gathered the motor stator end earlier because the inverse electromotive force that motor remanent magnetism and rotor moment of inertia are produced, comprise frequency F and amplitude U, resend the IGBT control signal according to the winding back emf of being gathered, and the output services state when making frequency converter return to before the unit bypass gradually, i.e. output voltage amplitude U
0With frequency F
0
Advantage of the present invention:
As shunting device, improved the withstand voltage level of bypass equipment with contactor, the hidden danger that misleads and refuse conducting of avoiding other shunting devices to exist.Adopt independently bypass centralized control plate centralized control, easy to maintenance, control is simple, has improved the fail safe and the reliability of bypass.
Description of drawings
Fig. 1: a kind of unit bypass device schematic diagram of unit series high-voltage frequency converter
Fig. 2: bypass centralized control plate schematic diagram
Fig. 3: high voltage converter unit bypass control flow chart
Fig. 4: high voltage converter drives the load schematic diagram
Embodiment
As shown in Figure 1, power cell 9 is mainly by fuse 8A, 8B, and 8C, rectifier diode 7A, 7B, 7C, 7D, 7E, 7F, filter capacitor 6, device for power switching 5A, 5B, 5C, 5D constitutes.Six rectifier diodes constitute the three phase full wave rectification bridge, and three-phase alternating-current supply is connected with the input of rectifier bridge through overcurrent fuse.The output of rectifier bridge is in parallel with the capacitor group that filter capacitor 6 is formed.4 device for power switching (as IGBT) constitute H type inverter bridge, and the input of inverter bridge links to each other with the capacitor group that filtering capacitor 6 is formed, and output links to each other with bypass contactor 4.Power cell 9 is as the unit series connection type high voltage frequency convertor elementary cell, and its structure present stage is widely adopted, and technology is also quite ripe.
Main circuit control board 10 is the embedded system based on a kind of control chip (as FPGA, DSP, ARM or single-chip microcomputer), or has a control system of equal calculation process ability, it and other auxiliary equipment communications, be responsible for the processing and the output of whole inverter control signal, comprising the processing and the output of by-passing signal.Main circuit control board 10 receives fault-signal from trouble unit, need to judge whether bypass, when needing bypass control signal is sent to bypass centralized control plate 2 with communication modes, the plate of bypass centralized control in addition 2 feedback contactor status signals are to the main circuit control board, main circuit control board 10 and bypass centralized control plate 2 can adopt optical fiber serial communication mode or other communication modes, the present invention adopts optical-fibre communications, but actually be not limited to optical-fibre communications, the advantage of optical-fibre communications is that bypass centralized control plate 2 and main circuit control board 10 are implemented electrical isolation, has reduced electrical Interference between two plates.
Traditional bypass circuit is to be moved by the firm and hard Bypass Control of executing of unit controls, and native system adopts independently bypass centralized control plate 2, as shown in Figure 2, bypass centralized control plate 2 is by opto-electronic conversion chip 12A, 12B, control chip 13 (as FPGA), chip for driving 14A, 14B, 14C, 14D, relay 15A, 15B, 15C, 15D constitute.The end of opto-electronic conversion chip 12A, 12B links to each other with main circuit control board 10 by corresponding optical fiber 11A, 11B with it, and the other end of opto-electronic conversion chip 12A, 12B links to each other with control chip 13.Use two opto-electronic conversion chip 12A, 12B, opto-electronic conversion chip 12A accepts the light signal of main circuit control board 10 and is converted into the signal of telecommunication to be sent to control chip 13, and opto-electronic conversion chip 12B is converted into optical signal transmission to main circuit control board 10 with the signal of telecommunication of control chip 13.Control chip 13 is provided with the control output end of respective numbers according to the frequency converter unit number, be responsible for judging required by-pass unit according to the signal controlling chip 13 that main circuit control board 10 sends, then bypass control signal is outputed to corresponding driving chip 14A from the corresponding output of required by-pass unit, 14B, 14C, 14D etc., chip for driving 14A, 14B, 14C, the signal output part of 14D etc. and corresponding relays 15A own, 15B, 15C, control ends such as 15D link to each other, relay 15A on the bypass centralized control plate 2,15B, 15C, 15D output as the control output of bypass centralized control plate 2 link to each other with a side of corresponding isolating transformer 3 (among the figure bypass centralized control plate can and line output control 36 isolating transformers, its mode of connection is all identical with control mode, and 19 refer to other road control output wiring terminals among the figure).The opposite side of isolating transformer 3 links to each other with the control coil of corresponding bypass contactor 4.Bypass contactor 4 has two passages, normally closed contact passage and normal opened contact passage, and the normally closed contact passage is connected normal opened contact passage and units corresponding output-parallel with units corresponding output.Bypass centralized control plate 2 links to each other by isolating transformer 3 with bypass contactor 4, not only can adjust voltage makes the control coil required voltage of control voltage and contactor be complementary, and make bypass centralized control plate 2 and high tension apparatus bypass contactor 4 that electrical isolation be arranged, guaranteed the trouble free service of bypass centralized control plate 2.
When the power cell operating state changes, as from pulse blocking or output zero level when the output non-zero level changes, the voltage dv/dt that the shunting device two ends apply is bigger, the present invention adopts bypass contactor 4 as shunting device, even if dv/dt is big again, shunting device can not produce misleading yet, and makes the unit bypass security reliability be improved.
Adopt bypass centralized control plate, not only simple in structure, easy to maintenance, and solved the problem that the unit can not effectively excise because of unit controls plate fault.Be equipped with independently power supply power supply for simultaneously bypass centralized control plate, when having avoided unit power down fault, the situation of Bypass Control normal power supply work can not be given in the unit, thereby avoids the bypass failure.
When certain unit breaks down, adopt the control program that adapts with it, guarantee that trouble unit is excised by bypass safely and reliably, Bypass Control flow chart such as Fig. 3, its control flow step is as follows:
A: the cell failure signal is delivered to main circuit control board 10, need to judge whether the excision trouble unit, when needs excise, preserve current frequency converter output voltage amplitude U0 and frequency F0 earlier, successfully excise in order to trouble unit and use when the back frequency converter recovers normal output.
B: according to u=Ldi/dt, for preventing the switching overvoltage in the contactor course of action, cut off main circuit current, main circuit control board 10 should block the switch controlling signal of the switching device IGBT of whole unit immediately, and then the by-passing signal that sends trouble unit makes the contactor 4 of trouble unit move to bypass centralized control plate 2.
C: wait for that certain hour (decide by selected contactor, is chosen as generally that 200ms～400ms), bypass contactor 4 actions are finished, and bypass centralized control plate 2 sends corresponding contactor 3 and moves the completion status signals to main circuit control board 7 by the concrete time.Main circuit control board 10 enters immediately and prepares to resend IGBT drive control signal state afterwards.
D: as Fig. 4, during high voltage converter 16 operate as normal, high voltage converter 16 links to each other with motor load 17 by power cable 18, resend the inconsistent impulse current that causes of back electromotive force of high voltage converter 16 output voltages and motor load 17 after the pulse for elimination, main circuit control board 10 must be gathered the motor stator end earlier because the inverse electromotive force that motor remanent magnetism and rotor moment of inertia are produced, comprise frequency F and amplitude U, resend the IGBT control signal according to the winding back emf of being gathered, and the output services state when making frequency converter return to before the unit bypass gradually, i.e. output voltage amplitude U
0With frequency F
0
Adopt above Bypass Control program circuit, safe and reliable excises the trouble unit bypass, and the impulse current minimum that motor load bore, and has realized the reliable and secure operation of high-performance of high voltage converter.
Subordinate list: the present invention used each components and parts model and producer:
| Sequence number | Title | Range of | Manufacturer | |
| 1 | Opto-electronic conversion chip 12A | T1521 | Agilent | |
| 2 | Opto-electronic conversion chip 12B | T2521 | Agilent | |
| 3 | |
FPGA-EP1C6 | Cyclone | |
| 4 | Chip for driving 14A, 14B, 14C, 14D | AQW214 | Panasonic | |
| 5 | |
G6D | The Omron | |
| 6 | Isolating transformer 3 | TOUT02 | The sky and water | |
| 7 | Bypass contactor 4 | GSC1-5008 | The sky and water |
In sum, there is advantage passing and that generally adopt mode institute not reach now in novel unit bypass proposed by the invention system, open the new window of a fan for the safe and reliable work of high voltage converter, opened up the new developing direction of unit series high-voltage frequency converter unit bypass.
Claims (1)
1. the unit bypass device of a unit series high-voltage frequency converter, it is characterized in that: described shunting device (1) comprises main circuit control board (10), bypass centralized control plate (2), isolating transformer (3) and bypass contactor (4); Described bypass centralized control plate (2) links to each other with isolating transformer (3) with main circuit control board (10) respectively, and isolating transformer (3) links to each other with bypass contactor (4), and bypass contactor (4) links to each other with corresponding power cell (9); Bypass centralized control plate (2) is by first, the second opto-electronic conversion chip (12A, 12B), control chip (13), chip for driving (14A, 14B, 14C, 14D) and relay (15A, 15B, 15C, 15D) constitute, first, the second opto-electronic conversion chip (12A, 12B) end is respectively by optical fiber (11A, 11B) link to each other with main circuit control board (10), first, the second opto-electronic conversion chip (12A, 12B) other end links to each other with control chip (13), the first opto-electronic conversion chip (12A) is accepted the light signal of main circuit control board (10) and is converted into the signal of telecommunication to be sent to control chip (13), the second opto-electronic conversion chip (12B) is converted into optical signal transmission to main circuit control board (10) with the signal of telecommunication of control chip (13), chip for driving (14A, 14B, 14C, 14D) signal output part and relay (15A, 15B, 15C, 15D) control end links to each other, relay (15A on the bypass centralized control plate (2), 15B, 15C, 15D) output links to each other with corresponding isolating transformer (3) one sides as the control output of bypass centralized control plate (2), the opposite side of isolating transformer (3) links to each other with the control coil of corresponding bypass contactor (4), bypass contactor (4) has two passages, normally closed contact passage and normal opened contact passage, the normally closed contact passage is connected with units corresponding output, normal opened contact passage and units corresponding output-parallel, bypass centralized control plate (2) links to each other by isolating transformer (3) with bypass contactor (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100529547A CN101369780B (en) | 2007-08-14 | 2007-08-14 | Unit bypass apparatus and control method of unit cascading high voltage frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100529547A CN101369780B (en) | 2007-08-14 | 2007-08-14 | Unit bypass apparatus and control method of unit cascading high voltage frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN101369780A CN101369780A (en) | 2009-02-18 |
| CN101369780B true CN101369780B (en) | 2011-04-20 |
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| CN2007100529547A Expired - Fee Related CN101369780B (en) | 2007-08-14 | 2007-08-14 | Unit bypass apparatus and control method of unit cascading high voltage frequency converter |
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Cited By (1)
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| CN102684468A (en) * | 2012-05-18 | 2012-09-19 | 卧龙电气集团股份有限公司 | Bypass cross control circuit and control method of high-voltage frequency conversion device |
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| CN101819430B (en) * | 2010-01-28 | 2012-07-04 | 中电电气(江苏)股份有限公司 | Fault signal processing system of high-voltage frequency converter controller and working method thereof |
| CN101951134A (en) * | 2010-08-24 | 2011-01-19 | 艾默生网络能源有限公司 | Cascade topology frequency converter and bypass topology thereof |
| CN103078483B (en) * | 2011-10-26 | 2015-07-01 | 乐星产电(无锡)有限公司 | High-voltage inverter device and control method thereof |
| CN102457196B (en) * | 2011-12-22 | 2014-04-09 | 上海中发变频科技有限公司 | Power unit control plate of high-voltage frequency converter |
| CN104953806B (en) * | 2014-08-23 | 2018-08-10 | 希望森兰科技股份有限公司 | Cascaseded power cell high-voltage frequency converter idle shunting device and its control method |
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| CN104269998B (en) * | 2014-09-28 | 2017-04-26 | 中冶赛迪电气技术有限公司 | Unit bypass device and control method of unit series frequency converter |
| CN107171537B (en) * | 2017-06-29 | 2023-07-14 | 上海电气富士电机电气技术有限公司 | Bypass control system of power unit and high-voltage variable-frequency speed regulation device |
| CN110308781A (en) * | 2019-03-26 | 2019-10-08 | 深圳大锄科技有限公司 | One kind can tolerance high power density series-fed devices and methods therefor |
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| CN101369780A (en) | 2009-02-18 |
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Denomination of invention: Unit bypass apparatus and control method of unit cascading high voltage frequency convertor Effective date of registration: 20140318 Granted publication date: 20110420 Pledgee: Hubei junior Finance Leasing Co., Ltd. Pledgor: Hubei Sanhuan Development Co., Ltd. Registration number: 2014990000172 |
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