CN101917115A - Bypass circuit for online replacement of power unit of high voltage frequency converter - Google Patents
Bypass circuit for online replacement of power unit of high voltage frequency converter Download PDFInfo
- Publication number
- CN101917115A CN101917115A CN 201010218967 CN201010218967A CN101917115A CN 101917115 A CN101917115 A CN 101917115A CN 201010218967 CN201010218967 CN 201010218967 CN 201010218967 A CN201010218967 A CN 201010218967A CN 101917115 A CN101917115 A CN 101917115A
- Authority
- CN
- China
- Prior art keywords
- bypass
- unit
- controllable silicon
- high voltage
- parallel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention provides a bypass circuit for online replacement of a power unit of a high voltage frequency converter, which comprises an electronic bypass subcircuit and a mechanically operated disconnecting link K connected in parallel at two output ends of an AC bus of each intelligent power unit inverter of the high voltage frequency converter. The electronic bypass subcircuit comprises a group of antiparallel silicon controlled thyristors and a silicon controlled absorbing circuit; the silicon controlled absorbing circuit consists of a unit reactor L, an absorption capacitor C and an absorption resistor R; and the absorption capacitor C and the absorption resistor R are connected in series and then connected in parallel between two ends of the antiparallel silicon controlled thyristors. The bypass circuit is characterized in that the unit reactor L and the antiparallel silicon controlled thyristors are connected in series and then connected in parallel to the output end. The bypass circuit has the advantages of online replacement of the failed intelligent power unit, low cost, low power consumption and high reliability.
Description
Technical field
The present invention relates to a kind of bypass circuit of online replacement of power unit of high voltage frequency converter.
Background technology
Along with the development of power electronic technology, high voltage frequency converter is increasingly extensive in the application in fields such as electric power, metallurgy, oil, chemical industry.The high voltage frequency converter of the excellent performance that present stage is made of the cascade of power units technology, have that harmonic wave is little, the unit is interchangeable, can produce in batches, advantage such as easy to maintenance, be subjected to domestic converter plant user and more and more favor, shown vast potential for future development.This stability and reliability to high voltage frequency converter is had higher requirement.
Present widely used unit cascaded high-voltage converter plant, can occur indivedual power cells once in a while and break down and cause whole converter plant can not normally move even jump the situation of machine in that device is in service, make the functional reliability of high voltage frequency converter reduce greatly, this has not only brought great hidden danger to production safety, also can bring bigger economic loss to the user.For not because of the operation of single failure cell influence system, press for a bypass circuit.At this moment, can the trouble unit bypass be gone out system by bypass circuit, continue operation by remaining power cell, the assurance system normally moves.Simultaneously, standby power units more need be changed the fault power unit in that converter plant is in service, thereby do not need converter plant stopped and to realize the maintenance of fault power unit, this has higher requirement to bypass circuit, reliably conducting of bypass circuit, also wanting can reliable turn-off.Application is convenient to realize that the bypass circuit of online replacement of power unit can improve high voltage frequency converter reliability of operation and fail safe greatly.
Present domestic high voltage frequency converter bypass circuit mainly contains three kinds, and a kind of is the bypass circuit that is made of relay, and its shortcoming is that the mechanical contact of relay exists loose contact or problem that can not precision maneuver sometimes, influences the reliability of system.
Bypass circuit such as Fig. 1 or similar bypass circuit that present most of high voltage frequency converter adopts.It is made of the unilateral diode rectifier bridge 2 that is arranged on inverter bridge 1 next door (rectifier bridge provides the two-way admittance passage to electric current), controllable silicon 3 and pre-charge circuit 4 herein.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 controllable silicon.When the unit breaks down, block the driving pulse of inverter bridge, trigger controllable silicon simultaneously, make the by-pass mistake that the phase current of place, unit phase is formed through diode rectifier bridge and controllable silicon, this moment, trouble unit was excised by bypass, this shunting device is simple in structure, easy to maintenance, and pre-charge circuit has solved the too high problem of controllable silicon tolerance dV/dt simultaneously.Yet realize the online replacing of power cell, also there is weak point: provide the two-way admittance passage to electric current by the unilateral diode rectifier bridge 2 that is arranged on inverter bridge 1 next door, this bypass circuit can be realized bypass when power cell breaks down, but be difficult to realize the online replacing of trouble unit, because in a single day converter plant controllable silicon 3 in service realizes that bypass will be difficult to realize reliable turn-off.
The another kind of electronics bypass circuit that high voltage frequency converter adopts as shown in Figure 2, serial connection controllable silicon absorption circuit 5, one group of inverse parallel controllable silicon 6 and mechanically actuated operation disconnecting link K successively on the output of inverter bridge 1.This bypass circuit provides alternating current path by the inverse parallel controllable silicon, and cost is low, low in energy consumption, can realize the online replacing of power cell.The unit reactor L that this bypass circuit is used for the absorption circuit of controllable silicon absorption dV/dt is connected on the unit output, though play the effect of output waveform being carried out filtering, but there is following defective: one, the absorption circuit parameter is subjected to the influence of output system parameter, what this gave the absorption circuit parameter determines to bring very big inconvenience, can't guarantee the consistency of converter plant bypass controllable silicon two ends dV/dt under the different loads situation; Two, output current caused the reactor heating through reactor when the unit normally moved.
Summary of the invention
The bypass circuit that the purpose of this invention is to provide a kind of online replacement of power unit of high voltage frequency converter, this bypass circuit is easy to realize, can be reliably bypass excision trouble unit fast, eliminate the bypath system complex structure of other types, the deficiency that is difficult to realize the online replacing of power cell; The heating problem of reactor when solving bypass controllable silicon absorption circuit parameter simultaneously and normally moved by the influence of output system parameter and power cell.
In order to achieve the above object, technical scheme of the present invention has provided a kind of bypass circuit of online replacement of power unit of high voltage frequency converter, comprise an electronics bypass branch and a mechanically actuated operation disconnecting link K of being connected in parallel on each inverter ac bus output two ends, intelligent power unit of high voltage converter, the electronics bypass branch comprises one group of inverse parallel controllable silicon and a kind of controllable silicon absorption circuit, the controllable silicon absorption circuit comprises unit reactor L, absorbing capacitor C and absorption resistance R forms, be parallel to inverse parallel silicon controlled two ends after absorbing capacitor C and absorption resistance R connecting, it is characterized in that, unit reactor L be parallel to output after the inverse parallel controllable silicon is connected.
The present invention with the unit reactor be placed in the bypass branch after the inverse parallel controllable silicon is connected, the parameter of the absorption circuit of dV/dt and system's output are full decoupled, can guarantee the consistency of converter plant bypass controllable silicon two ends dV/dt under the different loads situation, improve the controllable silicon reliability of operation.Absorption circuit is suppressed to dV/dt very low; make the controllable silicon forward and reverse in parallel in the electronics bypass can not bear too high dV/dt; the also situation that can not make forward and reverse controllable silicon in parallel occur misleading; thereby the assurance system is reliable electronics bypass during in fault in certain intelligent power unit; make system can under the operating mode of a certain qualification, continue operation simultaneously; wait for that the maintenance personal is ready to spare part; with the intelligent power unit of fault is online withdrawing under non-stop-machine situation; the spare part that more renews; withdraw from the physics bypass mechanism; new spare part drops into automatically, and system recovers operate as normal automatically.
The present invention is placed on the unit reactor in the bypass branch, and the unit output current was not only crossed reactor when the unit normally moved, and had reduced the total caloric value of power cell to a great extent.
Advantage of the present invention is to make the intelligent power unit of fault can realize online replacing, and cost is low, low in energy consumption, reliability is high.
Description of drawings
Fig. 1 is a bypass circuit circuit diagram in a kind of prior art;
Fig. 2 is a bypass circuit circuit diagram in the another kind of prior art;
Fig. 3 is a kind of bypass circuit figure of online replacement of power unit of high voltage frequency converter.
Embodiment
Specify the present invention below in conjunction with embodiment.
Embodiment
The present invention is parallel to each power cell output of high voltage frequency converter again and the mechanically actuated operation disconnecting link is connected in parallel on the power cell output after the unit reactor need being connected with the inverse parallel controllable silicon for the bypass that realizes the high voltage frequency converter trouble unit and the online replacing of intelligent fault unit.
As shown in Figure 3, bypass circuit is made of inverse parallel controllable silicon 6, controllable silicon absorption circuit 5 and mechanically actuated operation disconnecting link K.Controllable silicon absorption circuit 5 is made of unit reactor L, absorption resistance R and absorption capacitor C, is connected in parallel on inverse parallel controllable silicon 6 sides after resistance R and the capacitor C series connection.Unit reactor L be parallel to output after inverse parallel controllable silicon 6 is connected.When power cell breaks down, can be bypassed by bypass circuit reliably, and continue to power to motor by remaining power cell.The present invention is the reliability of enhanced system greatly.
Because the unit carrier frequency is higher, unit reactor L adopts radio-frequency rector.When power cell normally moved, unit reactor L power consumption was very little, can ignore.When the unit breaks down bypass, realize that the winding of unit reactor L after the electronics bypass will be by the phase current of its place phase, so will consider the heating situation of reactor during design cell reactor L.
In order to realize the online replacing of power cell, also need cooperative mechanical disconnecting link K bypass mechanism.Inverse parallel controllable silicon 6 is in off state when power cell normally moves, in case power cell breaks down, triggers inverse parallel controllable silicon 6, starts the electronics bypass circuit.When changing trouble unit, at first manual closing mechanically actuated operation disconnecting link K bypass mechanism realizes mechanical bypass; Secondly trouble unit is extracted; Be to load onto standby power units once more.Adopt technical scheme of the present invention, the intelligent power unit is in case get the electric electronics bypass that will trigger inverse parallel controllable silicon realization unit automatically.Standby power units is realized can manually mechanically actuated operation disconnecting link K being opened after the electronics bypass, and converter plant is in the electronics by-path running status.The online replacing of fault power unit is finished in the standby intelligent power unit that puts into operation at last.This is a free-revving engine of the present invention.
The above is specific embodiments of the invention only, does not limit protection scope of the present invention with this.Any equivalent transformation that those skilled in the art do based on technical solution of the present invention all belongs within the protection range of the present invention.
Claims (1)
1. the bypass circuit of an online replacement of power unit of high voltage frequency converter, comprise an electronics bypass branch and a mechanically actuated operation disconnecting link K of being connected in parallel on each intelligent power unit inverter (1) ac bus output two ends of high voltage converter, the electronics bypass branch comprises one group of inverse parallel controllable silicon (6) and a kind of controllable silicon absorption circuit (5), controllable silicon absorption circuit (5) comprises unit reactor L, absorbing capacitor C and absorption resistance R forms, be parallel to the two ends of inverse parallel controllable silicon (6) after absorbing capacitor C and absorption resistance R connecting, it is characterized in that, unit reactor L be parallel to output after inverse parallel controllable silicon (6) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010218967 CN101917115A (en) | 2010-06-30 | 2010-06-30 | Bypass circuit for online replacement of power unit of high voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010218967 CN101917115A (en) | 2010-06-30 | 2010-06-30 | Bypass circuit for online replacement of power unit of high voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101917115A true CN101917115A (en) | 2010-12-15 |
Family
ID=43324535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010218967 Pending CN101917115A (en) | 2010-06-30 | 2010-06-30 | Bypass circuit for online replacement of power unit of high voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101917115A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780224A (en) * | 2012-08-08 | 2012-11-14 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN107037359A (en) * | 2017-03-21 | 2017-08-11 | 上海新时达电气股份有限公司 | A kind of method of the use cascaded high-voltage frequency converter off-line identification parameter of electric machine |
| CN112564508A (en) * | 2019-09-26 | 2021-03-26 | 国创新能源汽车能源与信息创新中心(江苏)有限公司 | Power module online replacement control device and method for power electronic transformer system |
| CN112671253A (en) * | 2021-03-15 | 2021-04-16 | 四川华泰电气股份有限公司 | Cascaded H-bridge converter, open-circuit fault redundancy processing method, medium, and apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6687102B2 (en) * | 2000-08-18 | 2004-02-03 | Thomson Licensing S.A. | Battery-operated power supply unit |
| CN1545199A (en) * | 2003-08-22 | 2004-11-10 | 北京利德华福电气技术有限公司 | Method for processing power module fault of high voltage and high power frequency converter |
| CN101087108A (en) * | 2007-06-07 | 2007-12-12 | 上海科达机电控制有限公司 | A power unit bypass machine of high-voltage frequency conversion and speed-adjusting device |
| CN101299572A (en) * | 2008-05-23 | 2008-11-05 | 北京合康亿盛科技有限公司 | Pass-by apparatus for high voltage frequency transformer |
-
2010
- 2010-06-30 CN CN 201010218967 patent/CN101917115A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6687102B2 (en) * | 2000-08-18 | 2004-02-03 | Thomson Licensing S.A. | Battery-operated power supply unit |
| CN1545199A (en) * | 2003-08-22 | 2004-11-10 | 北京利德华福电气技术有限公司 | Method for processing power module fault of high voltage and high power frequency converter |
| CN101087108A (en) * | 2007-06-07 | 2007-12-12 | 上海科达机电控制有限公司 | A power unit bypass machine of high-voltage frequency conversion and speed-adjusting device |
| CN101299572A (en) * | 2008-05-23 | 2008-11-05 | 北京合康亿盛科技有限公司 | Pass-by apparatus for high voltage frequency transformer |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780224A (en) * | 2012-08-08 | 2012-11-14 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN102780224B (en) * | 2012-08-08 | 2014-04-23 | 西安交通大学 | Seamless cut-off controlling method for chained multi-level inverter error unit |
| CN107037359A (en) * | 2017-03-21 | 2017-08-11 | 上海新时达电气股份有限公司 | A kind of method of the use cascaded high-voltage frequency converter off-line identification parameter of electric machine |
| CN107037359B (en) * | 2017-03-21 | 2022-02-18 | 上海新时达电气股份有限公司 | Method for identifying motor parameters by using cascaded high-voltage frequency converter offline |
| CN112564508A (en) * | 2019-09-26 | 2021-03-26 | 国创新能源汽车能源与信息创新中心(江苏)有限公司 | Power module online replacement control device and method for power electronic transformer system |
| CN112564508B (en) * | 2019-09-26 | 2021-11-09 | 国创新能源汽车能源与信息创新中心(江苏)有限公司 | Power module online replacement control device and method for power electronic transformer system |
| CN112671253A (en) * | 2021-03-15 | 2021-04-16 | 四川华泰电气股份有限公司 | Cascaded H-bridge converter, open-circuit fault redundancy processing method, medium, and apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103036238B (en) | Control structure and method of chain-type active power filter (FAPF) linkage unit bypass | |
| CN203574421U (en) | Common direct current bus charging and discharging system | |
| CN103107689A (en) | Cascading transducer and power unit and bypass module of power unit | |
| CN106972479B (en) | Design method of direct-current micro-grid and high-low-voltage direct-current circuit breaker | |
| CN106877301A (en) | A kind of high voltage DC breaker and test method | |
| CN101882863B (en) | Unit bypass circuit of unit cascaded high-voltage frequency converter | |
| CN103236710A (en) | Unified power flow controller in modular structure | |
| CN103973094A (en) | Rapid precharging circuit for modular multi-level converter | |
| CN203104278U (en) | Power unit bypass structure for cascaded multi-level converter | |
| CN101917115A (en) | Bypass circuit for online replacement of power unit of high voltage frequency converter | |
| CN104600831A (en) | Inverter auxiliary power supply system and method | |
| CN205377695U (en) | High frequency electric separates power | |
| CN102394554A (en) | Power unit bypass circuit with redundancy control function | |
| CN201051720Y (en) | Power unit bypass machine of high-voltage frequency conversion speed-adjusting device | |
| CN202373976U (en) | Active filtering device | |
| CN202268801U (en) | Power unit bypass circuit with redundancy control function | |
| CN103560523A (en) | Photovoltaic generator set low-voltage ride-through supporting system based on DVR | |
| CN101087108B (en) | A power unit bypass machine of high-voltage frequency conversion and speed-adjusting device | |
| CN109728571A (en) | A kind of hybrid fault current limiter of capacitor commutation and its control method | |
| CN209593003U (en) | A kind of double-feed current transformer and power electronic equipment | |
| CN202872382U (en) | A high-voltage chained STATCOM and a mixed bypass system employed by the high-voltage chained STATCOM | |
| CN103023135A (en) | Multi-level direct current transformation power supply device | |
| Xu et al. | A restart strategy of bipolar short-circuit fault for MMC based power electronic transformer | |
| CN201393179Y (en) | Photovoltaic off-grid inverter | |
| CN202121324U (en) | Dynamic harmonic wave inhibition and reactive compensation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101215 |