CN207098600U - Converter valve submodule unit and modularization multi-level converter - Google Patents
Converter valve submodule unit and modularization multi-level converter Download PDFInfo
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- CN207098600U CN207098600U CN201720469193.4U CN201720469193U CN207098600U CN 207098600 U CN207098600 U CN 207098600U CN 201720469193 U CN201720469193 U CN 201720469193U CN 207098600 U CN207098600 U CN 207098600U
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- Prior art keywords
- full
- controlled switch
- converter valve
- valve submodule
- submodule unit
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- 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]
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Abstract
The utility model 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.A kind of modularization multi-level converter is also disclosed in the utility model, comprising 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 when direct-current short circuit failure occurs for system by the rapid disengagement failure current loop of itself full-controlled switch device locking, and realize that fast quick-recovery starts after being advantageous to system failure excision.
Description
Technical field
The utility model belongs to flexible direct-current transmission field, more particularly to a kind of change of current with fault current cut-out ability
Valve submodule unit, and the modularization multi-level converter formed using it as elementary cell.
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 exports, it is not necessary to the direct cascade of switching device, it is low to the consistent triggering requirement of device, this
Also there is many advantages, such as favorable expandability, switching frequency is low, running wastage is low, output voltage waveforms quality is high outside, 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, it can bear in DC network the critical equipment such as transverter severe
The electric stress carved, the security of equipment operation is reduced, 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 it is short-circuit when transverter in itself can
Fast and reliable latch-up protection is to realize the removing of short circuit current, and the currently used modular multilevel based on half-bridge structure
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, fast quick-recovery can not be realized after result in 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 formed
Transverter.
Utility model content
The purpose of this utility model, it is to provide a kind of converter valve submodule unit and modularization multi-level converter, its
It can be realized when direct-current short circuit failure occurs for system by the rapid disengagement failure current loop of itself full-controlled switch device locking
Protection to change of current station equipment, and realize that fast quick-recovery starts after being advantageous to system failure excision.
In order to reach above-mentioned purpose, solution of the present utility model 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 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 negative terminal of anode the second full-controlled switch module of connection of 3rd diode, 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 as the second end in converter valve subelement output end；
By-pass switch both ends are connected in parallel on converter valve submodule unit output end；
Linear quadratic control protection location connects the control terminal of first, second, third full-controlled switch module respectively and bypass is opened
The control terminal 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,
Negative pole using IGBT emitter stage as the full-controlled switch device.
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 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.
After such scheme, the utility model 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, change of current station equipment is protected, and do not need tripping AC breaker, quickly restarted after being advantageous to system failure excision
It is dynamic.
(2) converter valve submodule unit output end parallel connection by-pass switch, in submodule unit failure, by-pass switch closes
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 utility model；
Fig. 2 is a kind of charging operating mode schematic diagram of the converter valve submodule unit of the utility model under forward current；
Fig. 3 is a kind of bypass operating mode schematic diagram of the converter valve submodule unit of the utility model under forward current；
Fig. 4 is a kind of electric discharge operating mode schematic diagram of the converter valve submodule unit of the utility model under negative current；
Fig. 5 is a kind of bypass operating mode schematic diagram of the converter valve submodule unit of the utility model under negative current；
Fig. 6 is a kind of bypass operating mode schematic diagram of the converter valve submodule unit of the utility model in failure；
Fig. 7 is a kind of structural representation of modularization multi-level converter of the utility model.
Embodiment
Below with reference to accompanying drawing, the technical solution of the utility model is described in detail.
The utility model provides a kind of converter valve submodule unit, and multiple submodule unit concatenated in order in the same direction may be constructed
Modularization multi-level converter, it can meet that different voltage class, different capacity convey by the adjustment of sub-module cascade number
The requirement of capacity.
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 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 as the second end in converter valve submodule unit output end.
By-pass switch K both 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 terminal and by-pass switch K control terminal 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 and member is formed to submodule unit
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
Device T1, the second full-controlled switch device T2, the 3rd full-controlled switch device T3 whole lockings are closed, disengagement failure electric current is returned
Road, change of current station equipment is protected, and realize that fast quick-recovery starts after being advantageous to system failure excision.In addition converter valve submodule
Unit output end parallel connection by-pass switch K, in submodule unit failure, by-pass switch K closures, failure submodule is bypassed, no
The work of whole transverter can be influenceed, realizes fault redundance, improves operational reliability.
Wherein, the first/bis-/tri- full-controlled switch devices and can be formed 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 using IGBT emitter stage as the full-controlled switch device；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 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, be a kind of schematic diagram of modularization multi-level converter of the utility model, foregoing changed comprising several
Valve submodule unit is flowed, in each converter valve submodule unit, defines the first full-controlled switch device of the submodule unit
The tie point of part T1 negative poles and the second full-controlled switch device T2 negative poles is as first in converter valve submodule unit output end
End, second end of the negative pole extraction of the Support Capacitor as the converter valve submodule unit is defined, by a converter valve submodule
The second end concatenated in order in the same direction of the first end of module unit output end and the unit output end of another converter valve submodule forms
Modularization multi-level converter.
A kind of control method of modularization multi-level converter of the utility model, realize its following five kinds of working condition：
(1) forward current charged state：As shown in Fig. 2 T1, T2, T3 are closed, and 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 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 are cut off rapidly.
Above example is only to illustrate technological thought of the present utility model, it is impossible to limits protection model of the present utility model with this
Enclose, it is every according to the utility model proposes technological thought, any change done on the basis of technical scheme, each fall within this reality
Within the scope of novel protected.
Claims (6)
- A kind of 1. 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 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；Electric capacity negative terminal is opened with the anode of the second diode and the 3rd full-control type The negative terminal connection of module is closed, this tie point is as the second end in converter valve subelement output end；By-pass switch both ends are connected in parallel on converter valve submodule unit output end；Linear quadratic control protection location connects the control terminal and by-pass switch of first, second, third full-controlled switch module respectively Control terminal.
- A kind of 2. 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.
- A kind of 3. converter valve submodule unit as claimed in claim 2, it is characterised in that：The full-controlled switch device uses IGBT, using IGBT colelctor electrode as the full-controlled switch device positive pole, opened using IGBT emitter stage as the full-control type Close the negative pole of device.
- A kind of 4. converter valve submodule unit as claimed in claim 2, it is characterised in that：The full-controlled switch device uses 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.
- A kind of 5. converter valve submodule unit as claimed in claim 2, it is characterised in that：The full-controlled switch device uses 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.
- A kind of 6. modular multilevel change of current being made up of converter valve submodule unit as claimed in claim 1 for elementary cell Device, it is characterised in that：Comprising the converter valve submodule unit described in several claims 1, by a converter valve submodule list The first end of member and the second end concatenated in order comprising modules multilevel converter in the same direction of another converter valve submodule unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720469193.4U CN207098600U (en) | 2017-04-28 | 2017-04-28 | Converter valve submodule unit and modularization multi-level converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720469193.4U CN207098600U (en) | 2017-04-28 | 2017-04-28 | Converter valve submodule unit and modularization multi-level converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207098600U true CN207098600U (en) | 2018-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720469193.4U Expired - Fee Related CN207098600U (en) | 2017-04-28 | 2017-04-28 | Converter valve submodule unit and modularization multi-level converter |
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| CN (1) | CN207098600U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104418A (en) * | 2017-04-28 | 2017-08-29 | 南京南瑞继保电气有限公司 | Converter valve submodule unit, modularization multi-level converter and its control method |
-
2017
- 2017-04-28 CN CN201720469193.4U patent/CN207098600U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104418A (en) * | 2017-04-28 | 2017-08-29 | 南京南瑞继保电气有限公司 | Converter valve submodule unit, modularization multi-level converter and its control method |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 |
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| CF01 | Termination of patent right due to non-payment of annual fee |