CN107546984A - A kind of high-power modular HVDC converter of integrating filtering transformer - Google Patents
A kind of high-power modular HVDC converter of integrating filtering transformer Download PDFInfo
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- CN107546984A CN107546984A CN201710041338.5A CN201710041338A CN107546984A CN 107546984 A CN107546984 A CN 107546984A CN 201710041338 A CN201710041338 A CN 201710041338A CN 107546984 A CN107546984 A CN 107546984A
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Abstract
The invention discloses a kind of high-power modular HVDC converter of integrating filtering transformer, including modularization multi-level converter, three single-phase three-winding transformers and rectifier；The upper and lower bridge arm of each facies unit of modularization multi-level converter includes the half-bridge submodule of the equal series connection of quantity；The input of the upper and lower bridge arm of each facies unit is connected with the positive and negative end of dc bus respectively；Output end of the three single-phase three-winding transformer primary sides respectively with a upper and lower bridge arm of facies unit is connected；The secondary side of the single-phase three-winding transformer is connected with the input of rectifier respectively, realizes the rectification of three-phase alternating current.The present invention has high no-load voltage ratio, high energy conversion efficiency, wide-voltage-regulation scope, and is easy to expand, for ease of maintenaince, suitable for high pressure, the application scenario of high-capacity direct current power supply.
Description
Technical field
The present invention relates to field of power electronics, particularly a kind of high-power modular HVDC of integrating filtering transformer
Converter.
Background technology
With being substantially improved for electronic power switch device voltage grade and power grade, D.C. high voltage transmission (High
Voltage Direct Current, HVDC) at home and abroad obtain fast development.At present, HVDC is connecting asynchronous operation
The field such as AC network, remote bulk power transmission and submarine cable power transmission in be widely applied.
At present, the D.C. high voltage transmission based on voltage source converter (VSC-HVDC) and traditional current source type transverter
For D.C. high voltage transmission compared to many advantages be present, it is engineered the trend that application worldwide shows fast development.
Most crucial part is voltage source converter in VSC-HVDC systems, current existing various topological structures, wherein based on two
The voltage source converter structure of level is the simplest, in order that converter valve bears high voltage, single valve is used and can largely turned off
Device is directly connected, and necessarily brings device static, and dynamic voltage balancing problem and device will bear very high step voltage, to switch
The uniformity and reliability requirement of device are higher；To obtain preferable dynamic property and output current harmonics characteristic, need to use compared with
High switching frequency, thus produce very big devices switch loss.Three-level voltage source transverter topological structure is mostly diode clamp
Bit-type structure, compared to two level blocks, there is preferable output characteristics, but need more clamp diode, be unfavorable for mould
Blockization designs.Therefore, these factors constrain the engineering of two level and three-level structure transverter in high-voltage dc transmission electrical domain
Using.
In recent years, modularization multi-level converter (Modular Multilevel Converter, MMC) starts to be employed
Into high voltage direct current transmission project, D.C. high voltage transmission (the Modular Multilevel based on modularization multi-level converter
Converter based High Voltage Direct Current, MMC-HVDC) the very big MMC of technology is using submodule
Converter valve in series, it is highly susceptible to expanding its level number, when its submodule number is more, is significantly reduced exchange output electricity
The harmonic content of pressure, and level number is higher, and the switching frequency on MMC bridge arms needed for power device can be lower, and switching loss is got over
It is small.Based on many advantages of MMC structures, MMC-HVDC is to isolated island or passive network power supply, and distributed power generation is grid-connected, and power network is mutual
The fields such as connection, down town power supply, offshore wind farm networking have boundless application prospect.
At present, domestic existing multiple MMC-HVDC practical engineering projects, which are built up, puts into operation or among construction.MMC topologys
The novel topological structure that structure is applied as high-voltage dc transmission electrical domain, there are many advantages, but be completed throw in the world at present
Fortune or the MMC-HVDC engineerings in construction, capacity is still relatively low, and Traditional DC transmits electricity maximum capacity close to 8000MW；This
Outside, the output of each facies units of traditional MMC is required for accessing the larger chokes of volume, filter inductance, this limitation upper to a certain degree
MMC high modularization.As the direct current network based on flexible DC power transmission builds fast-developing, direct current network and friendship
Stream power network is run neck and neck even, and in some fields, substitution AC network will become a reality.MMC-HVDC technologies are still in engineer applied
Initial stage, many correlation techniques are simultaneously not perfect enough, it is still necessary to further further investigation, the engineering for promoting MMC-HVDC
Using having great importance.
The content of the invention
The technical problems to be solved by the invention are, in view of the shortcomings of the prior art, providing a kind of integrating filtering transformer
High-power modular HVDC converter.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of big work(of integrating filtering transformer
Rate Modular HVDC converter, including modularization multi-level converter, three single-phase three-winding transformers and rectifier；Institute
Stating the upper and lower bridge arm of each facies unit of modularization multi-level converter includes the half-bridge submodule of the equal series connection of quantity；Each
The input of the upper and lower bridge arm of facies unit is connected with the positive and negative end of dc bus respectively；The primary side of the single-phase three-winding transformer
Each the output end with the upper and lower bridge arm of every facies unit is connected；The secondary side of the single-phase three-winding transformer successively with rectification
The input connection of device, realizes the rectification of three-phase alternating current.
The half-bridge submodule includes a storage capacitor, two IGBT to connect；Two IGBT respectively with a diode
Reverse parallel connection；The storage capacitor is in parallel with two IGBT to connect；Put into when half-bridge submodule upper end IGBT opens then electric capacity,
The sub- submodule output voltage of half-bridge is Udc/ N, wherein UdcDC bus-bar voltage is represented, N represents the half-bridge submodule of bridge arm series winding
Number；When half-bridge submodule lower end IGBT opens then capacitive bypass, the sub- submodule output voltage of half-bridge is 0.
Compared with prior art, the advantageous effect of present invention is that：Present invention introduces single-phase three-winding transformer
With the function with the filtering of traditional reactance identical, suppression circulation, thus the chokes reactance of the upper and lower bridge arm of three-phase and three-phase export
Filter reactance can be saved, and so as to reduce equipment volume, reduce equipment complexity and cost, beneficial to modularized design, together
When can realize high no-load voltage ratio, the voltage output of wide scope.To sum up, the system has high no-load voltage ratio, high energy conversion efficiency, wide-voltage-regulation model
Enclose, and be easy to expand, for ease of maintenaince, suitable for high pressure, the application scenario of high-capacity direct current power supply.
Brief description of the drawings
Fig. 1 is the high-power modular HVDC converter structure chart of integrating filtering transformer；
Fig. 2 is modularization multi-level converter overall structure figure；
Fig. 3 is the sub-modular structure figure of modularization multi-level converter；
Fig. 4 is the facies unit structure chart of modularization multi-level converter；
Fig. 5 is single-phase three winding converter structure figure.
Embodiment
Referring to Fig. 1, for the high-power modular HVDC converter of integrating filtering transformer, changed by modular multilevel
Flow device, single-phase three-winding transformer and rectifier three parts composition.The modularization multi-level converter is by half-bridge submodule string
Connection forms, and high-voltage d. c inverse transform can be achieved；The single-phase three-winding transformer primary side output with each phase upper and lower bridge arm respectively
End is connected, and high no-load voltage ratio, the voltage output of wide scope can be achieved；The input of the rectifier and three single-phase three-winding transformers
It is sequentially connected and realizes the rectification of three-phase alternating current, obtains the dc source of voltage class needed for rear class.
Fig. 2 is the system modular multilevel converter overall structure figure, and the upper and lower bridge arm of each facies unit is by quantity phase
Deng half-bridge submodule be in series, the input of upper and lower bridge arm is connected with dc bus positive and negative terminal respectively, output end respectively with
Single-phase three-winding transformer primary side is connected.
Fig. 3 be submodule topology diagram, T1And T2Represent turn-off device IGBT, D1And D2Represent that inverse parallel exists
Diode on IGBT, C0Represent submodule electric capacity, ucRepresent capacitance voltage, icRepresent capacitance charging current, usmRepresent submodule
Output voltage, ismRepresent the electric current of inflow submodule.Submodule working condition can be divided into three according to switching device on off operating mode
Kind：(1)T1And T2It is turned off；(2)T1Open and T2Shut-off；(3)T1Shut-off and T2It is open-minded.
(1)T1And T2It is turned off：This working condition is typically referred to as abnormal operating state, now as electric current ismFor just
Direction (using in Fig. 3 note direction as reference direction) when, electric current passes through D1Capacitor is charged, electric current ismFor negative direction
When, electric current passes through D2By capacitor bypass.It can be seen that capacitor can only be electrically charged and can not discharge under this state, this work
State can be used for system to carry out uncontrollable charging when starting to submodule, during MMC normal works, not allow the state occur, no
It then will be deemed as submodule failure；
(2)T1Open and T2Shut-off：The state can be referred to as to Input Mode, now, if electric current ismDirection, will be right for just
Capacitor charges, electric current ismDirection be it is negative, will be to capacitor discharge, submodule capacitor is directly accessed main circuit under the state
In, and charge and discharge, submodule output capacitance voltage uc；
(3)T1Shut-off and T2It is open-minded：The state can be referred to as to excision model, now, no matter electric current ismDirection is just still
Negative, submodule capacitor will be all bypassed, and capacitor can not carry out discharge and recharge, and capacitance voltage keeps constant, equivalent to submodule
Output voltage is zero.
Whether the input of submodule electric capacity determined with input quantity by system modulation method, when sinusoidally throwing successively
It is fashionable, it can be achieved to approach the voltage output of sine wave, the number of modules of bridge arm series connection more at most about approaches sine wave.
Referring to Fig. 4, it is the facies unit structure chart of high-power modular HVDC converter, single-phase three winding therein
The double primary sides of transformer are connected with modularization multi-level converter output end respectively, and secondary side is connected with each of rectifier respectively
Connect.
Fig. 5 is single-phase three winding isolating transformer concrete structure diagram, and right figure is visible, because leakage inductance be present in transformer itself, because
And upper and lower the bridge arm inductance and output inductor of traditional modular multilevel converter can be substituted, and realize high no-load voltage ratio, width
The voltage output of scope.
Compared with traditional modularization multi-level converter, the present invention has and biography because of the single-phase three-winding transformer of introducing
Reactance identical of uniting filtering, the function of suppressing circulation, thus the chokes reactance of the upper and lower bridge arm of three-phase and three-phase output filter reactance
It can save, so as to reduce equipment volume, reduce equipment complexity and cost, beneficial to modularized design, and realize high change
Than the voltage output of, wide scope.To sum up, the system has high no-load voltage ratio, high energy conversion efficiency, wide-voltage-regulation scope, and is easy to open up
Exhibition, for ease of maintenaince, suitable for high pressure, the application scenario of high-capacity direct current power supply.
Claims (2)
1. a kind of high-power modular HVDC converter of integrating filtering transformer, it is characterised in that more including modularization
Level converter, three single-phase three-winding transformers and rectifier；The each facies unit of modularization multi-level converter it is upper,
Lower bridge arm includes the half-bridge submodule of the equal series connection of quantity；The input of the upper and lower bridge arm of each facies unit is female with direct current respectively
The positive and negative end connection of line；The respective output end phase with the upper and lower bridge arm of every facies unit of the primary side of the single-phase three-winding transformer
Even；The secondary side of the single-phase three-winding transformer is connected with the input of rectifier successively, realizes the rectification of three-phase alternating current.
2. the high-power modular HVDC converter of integrating filtering transformer according to claim 1, its feature exist
In the half-bridge submodule includes a storage capacitor, two IGBT to connect；Two IGBT respectively with a diode reverse simultaneously
Connection；The storage capacitor is in parallel with two IGBT to connect；When half-bridge submodule upper end IGBT opens then electric capacity input, half-bridge
Submodule output voltage isU dc /N, whereinU dc Represent DC bus-bar voltage,NRepresent the half-bridge submodule number of bridge arm series winding；When half
Bridge submodule lower end IGBT opens then capacitive bypass, and the sub- submodule output voltage of half-bridge is 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041338.5A CN107546984A (en) | 2017-01-20 | 2017-01-20 | A kind of high-power modular HVDC converter of integrating filtering transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041338.5A CN107546984A (en) | 2017-01-20 | 2017-01-20 | A kind of high-power modular HVDC converter of integrating filtering transformer |
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| CN107546984A true CN107546984A (en) | 2018-01-05 |
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| CN201710041338.5A Pending CN107546984A (en) | 2017-01-20 | 2017-01-20 | A kind of high-power modular HVDC converter of integrating filtering transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381607A (en) * | 2021-06-08 | 2021-09-10 | 哈尔滨工业大学 | Low-cost high-efficiency high-transformation-ratio DC/DC converter |
| US11437816B2 (en) | 2018-11-27 | 2022-09-06 | Hitachi Energy Switzerland Ag | STATCOM arrangement without phase reactors |
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| CN103339814A (en) * | 2011-02-01 | 2013-10-02 | 西门子公司 | Method for eliminating a fault on a high-voltage DC line, system for transmitting an electric current via a high-voltage dc line, and converter |
| CN104067504A (en) * | 2012-01-26 | 2014-09-24 | 西门子公司 | Multilevel converter |
| CN204145305U (en) * | 2014-09-16 | 2015-02-04 | 安徽理工大学 | A kind of novel DC-AC-DC converter being applied to high voltage direct current transmission |
| CN104485821A (en) * | 2014-11-18 | 2015-04-01 | 浙江大学 | Direct current transformer device used for power distribution |
| US20160365807A1 (en) * | 2009-03-30 | 2016-12-15 | Hitachi, Ltd. | Power conversion device with a plurality of series circuits |
-
2017
- 2017-01-20 CN CN201710041338.5A patent/CN107546984A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160365807A1 (en) * | 2009-03-30 | 2016-12-15 | Hitachi, Ltd. | Power conversion device with a plurality of series circuits |
| CN103339814A (en) * | 2011-02-01 | 2013-10-02 | 西门子公司 | Method for eliminating a fault on a high-voltage DC line, system for transmitting an electric current via a high-voltage dc line, and converter |
| CN104067504A (en) * | 2012-01-26 | 2014-09-24 | 西门子公司 | Multilevel converter |
| CN204145305U (en) * | 2014-09-16 | 2015-02-04 | 安徽理工大学 | A kind of novel DC-AC-DC converter being applied to high voltage direct current transmission |
| CN104485821A (en) * | 2014-11-18 | 2015-04-01 | 浙江大学 | Direct current transformer device used for power distribution |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11437816B2 (en) | 2018-11-27 | 2022-09-06 | Hitachi Energy Switzerland Ag | STATCOM arrangement without phase reactors |
| CN113381607A (en) * | 2021-06-08 | 2021-09-10 | 哈尔滨工业大学 | Low-cost high-efficiency high-transformation-ratio DC/DC converter |
| CN113381607B (en) * | 2021-06-08 | 2022-09-02 | 哈尔滨工业大学 | Low-cost high-efficiency high-transformation-ratio DC/DC converter |
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Application publication date: 20180105 |