CN207732449U - A kind of submodule topological structure for flexible direct current transmission converter valve - Google Patents
A kind of submodule topological structure for flexible direct current transmission converter valve Download PDFInfo
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- CN207732449U CN207732449U CN201721721824.3U CN201721721824U CN207732449U CN 207732449 U CN207732449 U CN 207732449U CN 201721721824 U CN201721721824 U CN 201721721824U CN 207732449 U CN207732449 U CN 207732449U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 25
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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
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- 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 provides a kind of submodule topological structure for flexible direct current transmission converter valve, and the submodule topological structure of the converter valve is connected to form by the full bridge structure submodule (1) and half-bridge structure submodule (2) of flexible direct current transmission converter valve.One exchange end A2 of the full bridge structure submodule (1) is connected with the DC terminal anode D21 of half-bridge structure submodule (2), and the DC terminal cathode D12 of full bridge structure submodule (1) is connected by diode D7 with the DC terminal cathode D22 of half-bridge structure submodule (2).Pass through an additional diode, full-bridge and half-bridge mixed topology, which are transformed into, can inhibit the new topology of fault current, and during inhibiting fault current, submodule two capacitances in the block automatically keep electric voltage equalization, avoid Voltage unbalance and pressure-resistant excessively high problem.
Description
Technical field
The utility model is related to flexible DC power transmissions and applied power electronics technical field, more particularly to a kind of for flexibility
The submodule topological structure of direct-current transmission converter valve.
Background technology
Flexible direct current power transmission system based on MMC voltage source converters, which has to passive system or weak AC system, to be supplied
Electric, active and idle quick independent control is readily configured multiterminal network and the excellent properties such as environmental-friendly, and MMC-HVDC systems
The conveying voltage harmonic content of system is extremely low, without being reconfigured additional filter so that based on the flexible DC power transmission of MMC defeated
Electrical domain has a wide range of applications.The core component of MMC-HVDC is power modules (the hereinafter referred to as submodule on bridge arm
Block), currently used submodule is the submodule of half-bridge topology, as shown in Figure 1.The soft lineal systems of MMC of half-bridge submodule composition
In DC line fault, fault current cannot be inhibited, can only by upper layer control and protection system by disconnect exchange side breaker come
Failure is removed, thus failure response speed is slow, fault current is big, and primary fault will cause whole straight-flow system to stop active transmission
It is reached more than the several seconds with reactive power support, seriously affects system stabilization.
Therefore, industry is proposed using traditional full bridge structure submodule, as shown in Fig. 2, to form the soft lineal systems of MMC.
The soft lineal system of full-bridge submodule composition can freely control the positive and negative of output DC voltage, can be fast in DC line fault
Speed output negative voltage inhibits fault current, and can continue to provide reactive power support in exchange side in DC side failure, hence it is evident that
Improve the reliability of system.But the loss of full-bridge submodule is very big, the soft straight system cost of composition is too high, in Practical Project
It is difficult to practicality.Meanwhile full-bridge submodule can symmetrically export same generating positive and negative voltage, this is far beyond straight-flow system to inhibiting event
The requirement for hindering electric current does not need to the negative voltage that soft lineal system output is equivalent to rated voltage in Practical Project.
In order to obtain preferable balance between system reliability and cost and loss, industry proposes a variety of methods and carries out
Compromise.A kind of modular multilevel converter valves for flexible direct current power transmission system of patent CN201420288038 propose, in bridge
Full-bridge submodule F-SM and half-bridge submodule H-SM are subjected to mixed configuration in arm, as shown in figure 3, full-bridge both played in this way
Module inhibits the characteristics of fault current, and can reduce the increase of cost and loss.But this scheme is in DC side failure, only
There is full-bridge submodule to participate in the inhibition of fault current, and then corresponding fault current energy all enters full-bridge submodule, will lead
The voltage of full-bridge submodule and half-bridge submodule is seriously uneven after causing failure.In order to ensure the reliability of system, it is necessary to increase
The pressure resistance design of full-bridge submodule, increases cost.As shown in figure 4, a kind of modular multilevel unsteady flows of patent CN103731059
Novel double clamper sub-module structure circuits of device propose a kind of new topology, can inhibit fault current, but inhibit failure electricity
When stream, internal switch pipe T5 will bear the voltage of twice normal value, it means that T5 must be designed to IGBT and directly connect, and drive
Dynamic complicated design, feasibility are relatively low.As shown in figure 5, a kind of improved modular multilevel changes of current of patent CN103904926A
Device submodule topology connects the full-bridge submodule of one IGBT of half-bridge submodule and removal, although fault current can be inhibited,
But it not only has the shortcomings that identical as CN201420288038, but also cannot export negative level in normal operation, reduce soft
Straight response of the transverter in system dynamic.
Invention content
In order to solve the problems, such as described in background technology, the utility model provides a kind of for flexible direct current transmission converter valve
Submodule topological structure, on the basis of patent CN201420288038, by an additional diode, by full-bridge and half-bridge
Mixed topology is transformed into the new topology that can inhibit fault current, and during inhibiting fault current, submodule is in the block
Two capacitances automatically keep electric voltage equalization, avoid Voltage unbalance and pressure-resistant excessively high problem.Meanwhile in usual operational process
In, the transverter formed with the utility model submodule can export the negative level for being equivalent to half rated voltage, meet system
The needs of dynamic regulation.
In order to achieve the above object, the utility model is realized using following technical scheme：
A kind of submodule topological structure for flexible direct current transmission converter valve, the submodule topology knot of the converter valve
Structure is connected to form by the full bridge structure submodule (1) and half-bridge structure submodule (2) of flexible direct current transmission converter valve.
One exchange end A2 of the full bridge structure submodule (1) and the DC terminal anode of half-bridge structure submodule (2)
D21 is connected, and the DC terminal cathode D12 of full bridge structure submodule (1) is straight by diode D7 and half-bridge structure submodule (2)
Stream end cathode D22 is connected.
Another exchange end A1 of full bridge structure submodule (1) is described with the end A3 that exchanges of half-bridge structure submodule (2)
Converter valve submodule topological structure two output ends.
It is also associated with reactor between the DC terminal cathode D12 and diode D7 of the full bridge structure submodule (1)
L7.Reactor L7 is for limiting dash current.
Compared with prior art, the utility model has the beneficial effects that：
1, a kind of submodule topological structure for flexible direct current transmission converter valve of the utility model, it is additional by one
Diode, full-bridge and half-bridge mixed topology be transformed into the new topology that can inhibit fault current, and inhibiting failure electricity
During stream, submodule two capacitances in the block automatically keep electric voltage equalization, avoid Voltage unbalance and pressure resistance excessively high is asked
Topic.Meanwhile in usual operational process, it can be exported with the transverter of submodule of the present invention composition and be equivalent to half rated voltage
Negative level, meet the needs of system dynamic regulation.
2, a kind of submodule topological structure for flexible direct current transmission converter valve of the utility model, ran usually
Cheng Zhong, the full-bridge being made of IGBT1, IGBT2, IGBT3, IGBT4, capacitance C1 can export equity positive negative level, and by
The half-bridge that IGBT5, IGBT6, capacitance C2 are formed can export positive level and zero level.When system jam converter blocking
Afterwards, if fault current is positive (flowing into submodule), fault current will have to flow through the series connection of two capacitances, suitable to generate
In the inhibition voltage of 2 times of capacitance voltages, inhibit fault current；If fault current is negative (outflow submodule), fault current will
The parallel connection of two capacitances is flowed through, to generate the inhibition voltage for being equivalent to capacitance voltage, inhibits fault current.Whether that feelings
Condition, fault current sharing on two capacitances inside the submodule is identical, and two capacitances will automatically keep the balance of voltage, will not
There is the case where voltage diverging.
Description of the drawings
The half-bridge sub-modular structure introduced in Fig. 1 background technologies；
The full-bridge sub-modular structure introduced in Fig. 2 background technologies；
Full-bridge submodule and half-bridge submodule the mixing composition bridge arm that Fig. 3 CN201420288038 are proposed；
The sub-modular structure that Fig. 4 CN103731059 are proposed；
The sub-modular structure that Fig. 5 CN103904926A are proposed；
A kind of submodule topological structure for flexible direct current transmission converter valve of Fig. 6 the utility model；
A kind of improved structure of the submodule topological structure for flexible direct current transmission converter valve of Fig. 7 the utility model；
A kind of positive failure electricity of the submodule topological structure for flexible direct current transmission converter valve of Fig. 8 the utility model
Approach when stream flows into；
A kind of reverse fault electricity of the submodule topological structure for flexible direct current transmission converter valve of Fig. 9 the utility model
Approach when stream flows into.
In figure：1- full bridge structure submodule 2- half-bridge structure submodules.
Specific implementation mode
Specific implementation mode provided by the utility model is described in detail below in conjunction with attached drawing.
As shown in fig. 6, a kind of submodule topological structure for flexible direct current transmission converter valve, the son of the converter valve
Module topology structure is connected to form by full bridge structure submodule (1) and half-bridge structure submodule (2).
One exchange end A2 of the full bridge structure submodule (1) and the DC terminal anode of half-bridge structure submodule (2)
D21 is connected, and the DC terminal cathode D12 of full bridge structure submodule (1) is straight by diode D7 and half-bridge structure submodule (2)
Stream end cathode D22 is connected.
Another exchange end A1 of full bridge structure submodule (1) is described with the end A3 that exchanges of half-bridge structure submodule (2)
Converter valve submodule topological structure two output ends.
The full bridge structure submodule (1) and half-bridge structure submodule (2) is the existing skill introduced in background technology
The full bridge structure sub-modular structure and half-bridge structure sub-modular structure of flexible direct current transmission converter valve, are the normal of MMC systems in art
With valve sub-modular structure.
In Fig. 6, the topological structure of the half-bridge structure submodule (2) by the IGBT5 containing anti-paralleled diode,
IGBT6 is in series, and the both ends of cascaded structure are also parallel with DC bus capacitor C2.
In Fig. 6, the topological structure of the full bridge structure submodule (1) is by the submodule of two half-bridge structures in parallel
DC terminal D11, D12 is connected to form, and the submodule of one of half-bridge structure is in series by IGBT1, IGBT2, another
The submodule of half-bridge structure is in series by IGBT3, IGBT4, the submodule common DC lateral capacitance C1 of two half-bridge structures.
As shown in fig. 7, may be used also between the DC terminal cathode D12 and diode D7 of the full bridge structure submodule (1)
To be connected with reactor L7.Reactor L7 is for limiting dash current.
Full bridge structure submodule (1) is made of two half-bridge structure submodules in parallel, the element in Fig. 6 include by
The half-bridge structure submodule that IGBT1, IGBT2 are constituted and the half-bridge structure submodule being made of IGBT3, IGBT4, two half-bridge knots
DC terminal D11, D12 of structure submodule is connected to form.
The operation principle of the submodule topological structure for flexible direct current transmission converter valve is：
In usual operational process, the full-bridge that is made of IGBT1, IGBT2, IGBT3, IGBT4, capacitance C1 can export pair
Deng positive negative level, and the half-bridge being made of IGBT5, IGBT6, capacitance C2 can export positive level and 0 level.When system occurs
After failure converter blocking, if fault current is positive (flowing into submodule), fault current will have to flow through the string of two capacitances
Connection inhibits fault current to generate the inhibition voltage for being equivalent to 2 times of capacitance voltages；If fault current is negative (outflow submodule
Block), fault current will flow through the parallel connection of two capacitances, to generate the inhibition voltage for being equivalent to capacitance voltage, inhibit failure electricity
Stream.Whether that situation, fault current sharing on two capacitances inside the submodule is identical, and two capacitances will be protected automatically
The case where holding the balance of voltage, being not in voltage diverging.
In order to be further simplified the control of submodule, can connect a low reactance L7 by separate diode D7, be used for
Inhibit dash current.The control of submodule can be reduced to the help of L7, during converter Control one it is independent
The control of full-bridge submodule and a half-bridge submodule, without worrying because internal impact electric current occurs in the combination of on off state.
In transverter start-up course, external ac power source charges to converter valve by pre-charge resistance.For this
The submodule of invention only need to normally be latched all IGBT, you can charge normal.No matter the direction of charging current, submodule are in the block
Two capacitances C1 and C2 can keep the balance of voltage automatically, not have to carry out additional control.
After converter deblocking, the submodule of the utility model can add a half-bridge submodule as a full-bridge submodule
Block is controlled.When bridge arm requires output positive level, according to nearest level approximate algorithm, corresponding submodule is put into；Work as bridge
When arm requires output negative level, is selected in full-bridge submodule and put into corresponding submodule.If using the realization side of Fig. 6
Formula needs, when the voltage of capacitance C1 is higher than the voltage of capacitance C2, to avoid opening submodule IGBT3 in the block.Fig. 7 is that can inhibit
The sub-modular structure of fault current and the holding capacitor balance of voltage improves, if using the realization method of Fig. 7, control system does not have to
Consider the inner case of submodule, can regard a completely self-contained full-bridge submodule and an independent half-bridge submodule into
Row control.Corresponding level recently approaches the method that control method has been industry maturation, is had a detailed description in more papers,
It repeats no more.
When in outside, catastrophe failure occurs in DC line, converter Control protection system can be latched transverter, in submodule
All IGBT can correspond to shutdown.At this moment, if bridge arm current flows into submodule, as shown in figure 8, electric current will be followed by：D1、
C1, D4, C2, D6 inhibit fault current so submodule port voltage will be equivalent to twice capacitance voltage.If
Bridge arm current flows out submodule, as shown in figure 9, electric current will be divided into two-way, flow through all the way after flowing through D5：D3, C1, in addition
It flows through all the way：C2、D7；Then two-way is understood and flows out submodule after flowing through D2.From analysis as it can be seen that when electric current flows into submodule,
Capacitance C1 and C2 are equivalent to series connection in circuit, and the charging rate of the two is identical, will keep the balance of voltage.When electric current flows out submodule
When block, capacitance C1 and C2 are equivalent to parallel connection in circuit, are charged to them by fault current, will keep the balance of voltage.And
And even if in aforementioned normal control, the voltage of capacitance C1 and C2 have slight difference, when fault current flows out submodule,
Electric current will first charge to the lower capacitance of voltage, after two capacitor voltage balances, can just be filled to the two parallel connection
Electricity.
As can be seen from the above analysis, submodule of the invention starts, normal in unlock operational process, and control is simple,
Existing ripe control algolithm is not influenced, and can export the negative level for being equivalent to half rated voltage size, improves system
Dynamic response；No matter the fault current direction in the system failure can inhibit fault current, and strict guarantee internal capacitance
The balance of voltage does not need additional control.
Above example is implemented under premised on technical solutions of the utility model, gives detailed embodiment
With specific operating process, but the scope of protection of the utility model is not limited to the above embodiments.Side used in above-described embodiment
Method is conventional method unless otherwise instructed.
Claims (2)
1. a kind of submodule topological structure for flexible direct current transmission converter valve, the submodule topological structure of the converter valve
It is connected to form by the full bridge structure submodule (1) and half-bridge structure submodule (2) of flexible direct current transmission converter valve；
It is characterized in that, the direct current of exchange an end A2 and half-bridge structure submodule (2) of the full bridge structure submodule (1)
Rectify pole D21 to be connected, the DC terminal cathode D12 of full bridge structure submodule (1) passes through diode D7 and half-bridge structure submodule
(2) DC terminal cathode D22 is connected；
Another exchange end A1 of full bridge structure submodule (1) is described change with the end A3 that exchanges of half-bridge structure submodule (2)
Flow two output ends of the submodule topological structure of valve.
2. a kind of submodule topological structure for flexible direct current transmission converter valve according to claim 1, feature exist
In being also associated with reactor L7 between the DC terminal cathode D12 and diode D7 of the full bridge structure submodule (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721721824.3U CN207732449U (en) | 2017-12-12 | 2017-12-12 | A kind of submodule topological structure for flexible direct current transmission converter valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721721824.3U CN207732449U (en) | 2017-12-12 | 2017-12-12 | A kind of submodule topological structure for flexible direct current transmission converter valve |
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| CN207732449U true CN207732449U (en) | 2018-08-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107910886A (en) * | 2017-12-12 | 2018-04-13 | 荣信汇科电气技术有限责任公司 | A kind of submodule topological structure and method for flexible direct current transmission converter valve |
| CN111293911A (en) * | 2020-02-10 | 2020-06-16 | 华北电力大学（保定） | Shift full-bridge modular multilevel converter |
| WO2021052298A1 (en) * | 2019-09-19 | 2021-03-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Charging method for extra-high voltage flexible direct-current hybrid full-bridge and half-bridge converter |
| CN113595128A (en) * | 2021-08-10 | 2021-11-02 | 东南大学 | Flexible ring network controller topology without connection transformer |
-
2017
- 2017-12-12 CN CN201721721824.3U patent/CN207732449U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107910886A (en) * | 2017-12-12 | 2018-04-13 | 荣信汇科电气技术有限责任公司 | A kind of submodule topological structure and method for flexible direct current transmission converter valve |
| CN107910886B (en) * | 2017-12-12 | 2024-01-12 | 荣信汇科电气股份有限公司 | Submodule topological structure and method for flexible direct-current transmission converter valve |
| WO2021052298A1 (en) * | 2019-09-19 | 2021-03-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Charging method for extra-high voltage flexible direct-current hybrid full-bridge and half-bridge converter |
| CN111293911A (en) * | 2020-02-10 | 2020-06-16 | 华北电力大学（保定） | Shift full-bridge modular multilevel converter |
| CN113595128A (en) * | 2021-08-10 | 2021-11-02 | 东南大学 | Flexible ring network controller topology without connection transformer |
| CN113595128B (en) * | 2021-08-10 | 2023-08-22 | 东南大学 | Flexible ring network controller topology without coupling transformer |
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Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee after: Rongxin Huike Electric Co.,Ltd. Patentee after: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Address before: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee before: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Patentee before: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. |
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