CN107104418A - Converter valve submodule unit, modularization multi-level converter and its control method - Google Patents
Converter valve submodule unit, modularization multi-level converter and its control method Download PDFInfo
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- CN107104418A CN107104418A CN201710291700.4A CN201710291700A CN107104418A CN 107104418 A CN107104418 A CN 107104418A CN 201710291700 A CN201710291700 A CN 201710291700A CN 107104418 A CN107104418 A CN 107104418A
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- full
- controlled switch
- switch module
- converter valve
- converter
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention discloses a kind of converter valve submodule unit, including at least one DC support electric capacity, equalizing resistance, three full-controlled switch modules, three diodes, by-pass switch and linear quadratic control protection location.Invention additionally discloses a kind of modularization multi-level converter and its control method, the modularization multi-level converter includes several foregoing converter valve submodule units, by the second end concatenated in order comprising modules multilevel converter in the same direction of the first end of a converter valve submodule unit and another converter valve submodule unit.Such a technical scheme can realize the protection to change of current station equipment, and be conducive to the system failure to realize that fast quick-recovery starts after cutting off when direct-current short circuit failure occurs for system by the rapid disengagement failure current loop of itself full-controlled switch device locking.
Description
Technical field
The invention belongs to flexible direct-current transmission field, more particularly to a kind of converter valve that ability is cut off with fault current
Modular unit, and the modularization multi-level converter constituted using it as elementary cell, and the modularization multi-level converter
Control method.
Background technology
Technology of HVDC based Voltage Source Converter can be applied to grid-connected distribution type renewable energy, island and city load intensive area and supply
Electricity.Voltage-source type modularization multi-level converter based on full-control type power electronic switching device has in flexible direct-current transmission field
And be widely applied.
Modularization multi-level converter (Modular Multilevel Converter, MMC) passes through several converter valves
Submodule unit cascade realizes that high voltage is exported, it is not necessary to which the direct cascade of switching device, triggering requirement consistent to device is low, this
Also there is favorable expandability outside, many advantages, such as switching frequency is low, running wastage is low, output voltage waveforms quality is high, but due to soft
Property direct current transportation network low damping characteristic cause system occur short trouble when, failure current-rising-rate at initial stage reaches thousands of peaces
Every millisecond of rank, the breaking speed of AC circuit breaker a few tens of milliseconds can make the critical equipment such as transverter in DC network bear severe
The electric stress carved, reduces the security of equipment operation, in addition in view of high-voltage large-capacity dc circuit breaker technology does not have also at present
Make a breakthrough, also can not fast shut-off fault current, this require straight-flow system occur short circuit when transverter in itself can
Fast and reliable latch-up protection is to realize the removing of short circuit current flow, and the modular multilevel based on half-bridge structure conventional at present
Converter valve submodule, in DC side failure, generally can not due to the presence of full-controlled switch device inverse parallel fly-wheel diode
, typically can only be by disconnecting AC breaker come disjunction using the method for control or locking transverter come limiting short-circuit current
Fault current, result in can not realize fast quick-recovery after the system failure.
In view of analyzing above, the present inventor proposes that one kind can pass through full-controlled switch device locking in the system failure
The converter valve submodule unit in fast shut-off fault current loop, and the modular multilevel that this structure submodule unit is constituted
Transverter.
The content of the invention
The purpose of the present invention, is to provide a kind of converter valve submodule unit, modularization multi-level converter and its control
Method, it can be returned when direct-current short circuit failure occurs for system by the rapid disengagement failure electric current of itself full-controlled switch device locking
Road, realizes the protection to change of current station equipment, and be conducive to the system failure to realize that fast quick-recovery starts after cutting off.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of converter valve submodule unit, including at least one DC support electric capacity, equalizing resistance, three full-controlled switch
Module, three diodes, by-pass switch and linear quadratic control protection location, wherein, equalizing resistance and all DC support electric capacity phases
It is mutually in parallel；
First full-controlled switch module anode is connected with electric capacity anode, and the first full-controlled switch module negative terminal is connected to second
Full-controlled switch module negative terminal, this tie point is used as the first end in converter valve subelement output end；Second full-controlled switch mould
Block anode connects the negative electrode of the second diode；The anode of 3rd diode connects the negative terminal of the second full-controlled switch module, the 3rd
The negative electrode of diode connects the anode of the 3rd full-controlled switch module；Electric capacity negative terminal and the anode of the second diode and the 3rd full control
The negative terminal connection of type switch module, this tie point is used as the second end in converter valve subelement output end；
By-pass switch two ends are connected in parallel on converter valve submodule unit output end；
Linear quadratic control protection location connects the control end of first, second, third full-controlled switch module respectively and bypass is opened
The control end of pass.
Above-mentioned full-controlled switch module include full-controlled switch device and with its antiparallel diode, wherein, full-control type
The positive pole of switching device and the anode that the negative electrode connected end sub-definite of anti-paralleled diode is full-controlled switch module；Full-control type is opened
The anode connected end sub-definite of the negative pole and anti-paralleled diode that close device is the negative terminal of full-controlled switch module.
Above-mentioned full-controlled switch device uses IGBT, using IGBT colelctor electrode as the full-controlled switch device positive pole,
The negative pole of the full-controlled switch device is used as using IGBT emitter stage.
Above-mentioned full-controlled switch device uses MOSFET, using MOSFET source electrode as the full-controlled switch device just
Pole, the full-controlled switch device negative pole is used as using MOSFET drain electrode.
Above-mentioned full-controlled switch device uses IGCT, using IGCT anode as the full-controlled switch device positive pole, with
IGCT negative electrode is used as the full-controlled switch device negative pole.
A kind of modularization multi-level converter being made up of foregoing converter valve submodule for elementary cell, if comprising
Dry converter valve submodule unit, by the first end of a converter valve submodule unit and another converter valve submodule unit
Second end concatenated in order comprising modules multilevel converter in the same direction.
A kind of control method of modularization multi-level converter, realizes its following five kinds of working condition：
Forward current charged state：First to the 3rd full-controlled switch module is turned off, the first diode current flow, direct current branch
Support electric capacity charging；
Forward current bypass condition：First full-controlled switch module is closed, and the second full-controlled switch module is closed, and the 3rd is complete
Control type switch module is open-minded, the 3rd diode current flow, and DC support electric capacity no current flows through；
Negative current discharge condition：First full-controlled switch module is open-minded, and the second full-controlled switch module is closed, and the 3rd is complete
Control type switch module is closed, the electric discharge of DC support electric capacity；
Negative current bypass condition：First full-controlled switch module is closed, and the second full-controlled switch module is open-minded, the 3rd full control
Type switch module is closed, and the second diode current flow, DC support electric capacity no current flows through；
Failure bypass state：When being broken down inside submodule unit, by-pass switch closure, electric current is from by-pass switch stream
Cross, the wholly off operation of the linear quadratic control protection location inside submodule unit.
After such scheme, the invention has the advantages that：
(1) when straight-flow system breaks down, by first, second, third full-controlled switch device locking, disengagement failure electric current
Loop, protects change of current station equipment, and does not need tripping AC breaker, is conducive to the system failure quickly to restart after cutting off
It is dynamic.
(2) converter valve submodule unit output end by-pass switch in parallel, in submodule unit failure, by-pass switch is closed
Close, failure submodule is bypassed, the work of whole transverter is not interfered with, realizes fault redundance, improve operational reliability.
Brief description of the drawings
Fig. 1 is a kind of electrical schematic diagram of converter valve submodule unit of the invention；
Fig. 2 is a kind of charging operating mode schematic diagram of the converter valve submodule unit of the invention under forward current；
Fig. 3 is a kind of bypass operating mode schematic diagram of the converter valve submodule unit of the invention under forward current；
Fig. 4 is a kind of electric discharge operating mode schematic diagram of the converter valve submodule unit of the invention under negative current；
Fig. 5 is a kind of bypass operating mode schematic diagram of the converter valve submodule unit of the invention under negative current；
Fig. 6 is a kind of bypass operating mode schematic diagram of the converter valve submodule unit of the invention in failure；
Fig. 7 is a kind of structural representation of modularization multi-level converter of the invention.
Embodiment
Below with reference to accompanying drawing, technical scheme is described in detail.
The present invention provides a kind of converter valve submodule unit, and multiple submodule unit concatenated in order in the same direction may be constructed module
Change multilevel converter, different voltage class, different capacity transmission capacity can be met by the adjustment of sub-module cascade number
Requirement.
As shown in figure 1, the converter valve submodule unit includes at least one DC support electric capacity C1~Cn, equalizing resistance
R1, the first full-controlled switch device T1, the second full-controlled switch device T2, the 3rd full-controlled switch device T3, the first diode
D1, the second diode D2, the 3rd diode D3, by-pass switch K and linear quadratic control protection location KZ, wherein, n is natural number, works as n
>When 1, the DC support electric capacity is mutually connected in parallel in the same direction, and the shunt capacitance group of formation is in parallel with equalizing resistance R1 again.
First full-controlled switch device T1 positive pole and its anti-paralleled diode D1 negative electrode are connected with electric capacity anode, and first
Full-controlled switch device T1 negative pole is connected to the second full-controlled switch device T2 negative pole, and this tie point is used as converter valve submodule
First end in module unit output end；Second full-controlled switch device T2 positive pole connects the second diode D2 negative electrode；3rd
Diode D3 anode connects the second full-controlled switch device T2 negative pole, and the 3rd diode D3 negative electrode connects the 3rd full-control type
The positive pole of switching element T 3；The negative pole of electric capacity negative terminal and the second diode D2 anode and the 3rd full-controlled switch device T3 connects
Connect, this tie point is used as the second end in converter valve submodule unit output end.
By-pass switch K two ends are connected in parallel on the output end of converter valve submodule unit.
Linear quadratic control protection location KZ connect respectively the first full-controlled switch device T1, the second full-controlled switch device T2,
3rd full-controlled switch device T3 control end and by-pass switch K control end are complete for control first, second, third in real time
The turn-on and turn-off of control type switching device and by-pass switch K closure disjunction, and can realize to submodule unit composition member
The monitoring and protection of device.
When straight-flow system breaks down, linear quadratic control protection location KZ issues lock-in control order, and the first full-control type is opened
The whole lockings of device T1, the second full-controlled switch device T2, the 3rd full-controlled switch device T3 are closed, disengagement failure electric current is returned
Road, protects change of current station equipment, and be conducive to the system failure to realize that fast quick-recovery starts after cutting off.In addition converter valve submodule
Unit output end parallel connection by-pass switch K, in submodule unit failure, by-pass switch K closures bypass failure submodule, no
The work of whole transverter can be influenceed, fault redundance is realized, operational reliability is improved.
Wherein, the first/bis-/tri- full-controlled switch devices and it can be constituted entirely with its antiparallel the first/bis-/tri- diode
Control type switch module, the positive pole of full-controlled switch device and the negative electrode connected end sub-definite of anti-paralleled diode are full-controlled switch
The anode of module, the negative pole of full-controlled switch device and the anode connected end sub-definite of anti-paralleled diode are full-controlled switch mould
The negative terminal of block.
First, second, third full-controlled switch device can be IGBT, and the full control is used as using IGBT colelctor electrode
Type switching device positive pole, the negative pole of the full-controlled switch device is used as using IGBT emitter stage；Or, described first, second,
3rd full-controlled switch device can be MOSFET, using MOSFET source electrode as the full-controlled switch device positive pole, with
MOSFET drain electrode is used as the full-controlled switch device negative pole；Or, first, second, third full-controlled switch device
It can be IGCT, using IGCT anode as the full-controlled switch device positive pole, the full-control type is used as using IGCT negative electrode
Switching device negative pole.
As shown in fig. 7, being a kind of schematic diagram of modularization multi-level converter of the invention, several foregoing converter valves are included
Submodule unit, in each converter valve submodule unit, defines the first full-controlled switch device T1 of the submodule unit
The tie point of negative pole and the second full-controlled switch device T2 negative poles is fixed as the first end in converter valve submodule unit output end
The negative pole of the justice Support Capacitor draws the second end as the converter valve submodule unit, by a converter valve submodule unit
The second end concatenated in order comprising modules in the same direction of the first end of output end and the unit output end of another converter valve submodule
Multilevel converter.
The present invention also provides a kind of control method of modularization multi-level converter, realizes its following five kinds of working condition：
(1) forward current charged state：As shown in Fig. 2 T1, T2, T3 are closed, the first diode D1 conductings, DC support
Electric capacity charges；
(2) forward current bypass condition：As shown in figure 3, T1 is closed, T2 is closed, and T3 is open-minded, the 3rd diode D3 conductings,
DC support electric capacity no current flows through；
(3) negative current discharge condition：As shown in figure 4, T1 is open-minded, T2 is closed, and T3 is closed, the electric discharge of DC support electric capacity；
(4) negative current bypass condition：As shown in figure 5, T1 is closed, T2 is open-minded, and T3 is closed, the second diode D2 conductings,
DC support electric capacity no current flows through；
(5) failure bypass state：As shown in fig. 6, when being broken down inside submodule unit, by-pass switch K closures, electric current
Flowed through from by-pass switch K, the wholly off operation of the linear quadratic control protection location inside submodule unit.
Using the converter valve submodule unit of the program, after straight-flow system breaks down, T1, T2 and T3 drive signal
Locking, fault current path is cut off rapidly.
The technological thought of above example only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.
Claims (7)
1. a kind of converter valve submodule unit, it is characterised in that：Including at least one DC support electric capacity, equalizing resistance, three
Full-controlled switch module, three diodes, by-pass switch and linear quadratic control protection location, wherein, equalizing resistance and all direct currents
Support Capacitor is parallel with one another；
First full-controlled switch module anode is connected with electric capacity anode, and the first full-controlled switch module negative terminal is connected to the second full control
Type switch module negative terminal, this tie point is used as the first end in converter valve subelement output end；Second full-controlled switch module is just
The negative electrode of the second diode of end connection；The anode of 3rd diode connects the negative terminal of the second full-controlled switch module, the three or two pole
The negative electrode of pipe connects the anode of the 3rd full-controlled switch module；The anode and the 3rd full-control type of electric capacity negative terminal and the second diode are opened
The negative terminal connection of module is closed, this tie point is used as the second end in converter valve subelement output end；
By-pass switch two ends are connected in parallel on converter valve submodule unit output end；
Linear quadratic control protection location connects the control end and by-pass switch of first, second, third full-controlled switch module respectively
Control end.
2. a kind of converter valve submodule unit as claimed in claim 1, it is characterised in that：The full-controlled switch module includes
Full-controlled switch device and with its antiparallel diode, wherein, the positive pole of full-controlled switch device and anti-paralleled diode
Negative electrode connected end sub-definite is the anode of full-controlled switch module；The negative pole of full-controlled switch device and the sun of anti-paralleled diode
Pole connected end sub-definite is the negative terminal of full-controlled switch module.
3. a kind of converter valve submodule unit as claimed in claim 2, it is characterised in that：The full-controlled switch device is used
IGBT, using IGBT colelctor electrode as the full-controlled switch device positive pole, is opened using IGBT emitter stage as the full-control type
Close the negative pole of device.
4. a kind of converter valve submodule unit as claimed in claim 2, it is characterised in that：The full-controlled switch device is used
MOSFET, using MOSFET source electrode as the full-controlled switch device positive pole, the full-control type is used as using MOSFET drain electrode
Switching device negative pole.
5. a kind of converter valve submodule unit as claimed in claim 2, it is characterised in that：The full-controlled switch device is used
IGCT, using IGCT anode as the full-controlled switch device positive pole, the full-controlled switch device is used as using IGCT negative electrode
Part negative pole.
6. a kind of modularization multi-level converter being made up of converter valve submodule as claimed in claim 1 for elementary cell,
It is characterized in that：Comprising the converter valve submodule unit described in several claims 1, by converter valve submodule unit
The second end concatenated in order comprising modules multilevel converter in the same direction of first end and another converter valve submodule unit.
7. a kind of control method of modularization multi-level converter as claimed in claim 6, it is characterised in that realize that its is as follows
Five kinds of working conditions：
Forward current charged state：First to the 3rd full-controlled switch module is turned off, the first diode current flow, DC support electricity
Capacity charge；
Forward current bypass condition：First full-controlled switch module is closed, and the second full-controlled switch module is closed, the 3rd full-control type
Switch module is open-minded, the 3rd diode current flow, and DC support electric capacity no current flows through；
Negative current discharge condition：First full-controlled switch module is open-minded, and the second full-controlled switch module is closed, the 3rd full-control type
Switch module is closed, the electric discharge of DC support electric capacity；
Negative current bypass condition：First full-controlled switch module is closed, and the second full-controlled switch module is open-minded, and the 3rd full-control type is opened
Close module to close, the second diode current flow, DC support electric capacity no current flows through；
Failure bypass state：When being broken down inside submodule unit, by-pass switch closure, electric current flows through from by-pass switch, son
The wholly off operation of linear quadratic control protection location inside modular unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710291700.4A CN107104418A (en) | 2017-04-28 | 2017-04-28 | Converter valve submodule unit, modularization multi-level converter and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710291700.4A CN107104418A (en) | 2017-04-28 | 2017-04-28 | Converter valve submodule unit, modularization multi-level converter and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107104418A true CN107104418A (en) | 2017-08-29 |
Family
ID=59657898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710291700.4A Pending CN107104418A (en) | 2017-04-28 | 2017-04-28 | Converter valve submodule unit, modularization multi-level converter and its control method |
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| CN (1) | CN107104418A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508267A (en) * | 2017-09-20 | 2017-12-22 | 国家电网公司 | A kind of modularization multi-level converter of voltage source converter submodule unit and its composition |
| CN110808606A (en) * | 2019-12-09 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Power module overvoltage prevention circuit of flexible direct current transmission and converter valve |
| CN112310946A (en) * | 2020-10-22 | 2021-02-02 | 许继集团有限公司 | Flexible direct current converter valve submodule and control method thereof |
| CN112542947A (en) * | 2019-09-20 | 2021-03-23 | 南京南瑞继保电气有限公司 | Conversion circuit, front-end circuit, submodule, direct current converter and control method |
| CN112968591A (en) * | 2021-03-08 | 2021-06-15 | 清华大学 | High-power water-cooling unit structure based on IGCT thyristor constitutes |
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| CN105790228A (en) * | 2016-04-20 | 2016-07-20 | 广州供电局有限公司 | Converter valve sub-module and modularized multi-level converter |
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| CN205982459U (en) * | 2016-08-05 | 2017-02-22 | 南京南瑞继保电气有限公司 | MMC developments sub - modular unit of simulation and transverter with topology switching ability |
| CN207098600U (en) * | 2017-04-28 | 2018-03-13 | 南京南瑞继保电气有限公司 | Converter valve submodule unit and modularization multi-level converter |
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| SE1300553A1 (en) * | 2013-08-20 | 2013-08-27 | Abb Technology Ltd | DC / DC converter with multiple ports |
| CN105790228A (en) * | 2016-04-20 | 2016-07-20 | 广州供电局有限公司 | Converter valve sub-module and modularized multi-level converter |
| CN106154086A (en) * | 2016-08-05 | 2016-11-23 | 南京南瑞继保电气有限公司 | A kind of MMC dynamic analog submodule unit with topological switching capability |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508267A (en) * | 2017-09-20 | 2017-12-22 | 国家电网公司 | A kind of modularization multi-level converter of voltage source converter submodule unit and its composition |
| CN112542947A (en) * | 2019-09-20 | 2021-03-23 | 南京南瑞继保电气有限公司 | Conversion circuit, front-end circuit, submodule, direct current converter and control method |
| CN112542947B (en) * | 2019-09-20 | 2023-05-09 | 南京南瑞继保电气有限公司 | Conversion circuit, front-end circuit, sub-module, direct current converter and control method |
| CN110808606A (en) * | 2019-12-09 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Power module overvoltage prevention circuit of flexible direct current transmission and converter valve |
| CN112310946A (en) * | 2020-10-22 | 2021-02-02 | 许继集团有限公司 | Flexible direct current converter valve submodule and control method thereof |
| CN112310946B (en) * | 2020-10-22 | 2022-07-12 | 许继集团有限公司 | Flexible direct current converter valve submodule and control method thereof |
| CN112968591A (en) * | 2021-03-08 | 2021-06-15 | 清华大学 | High-power water-cooling unit structure based on IGCT thyristor constitutes |
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