CN203968008U - A kind of modular multilevel converter valve for flexible DC power transmission system - Google Patents
A kind of modular multilevel converter valve for flexible DC power transmission system Download PDFInfo
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- CN203968008U CN203968008U CN201420288038.9U CN201420288038U CN203968008U CN 203968008 U CN203968008 U CN 203968008U CN 201420288038 U CN201420288038 U CN 201420288038U CN 203968008 U CN203968008 U CN 203968008U
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- converter valve
- submodule
- power transmission
- flexible
- transmission system
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- 208000035126 Facies Diseases 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 description 25
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000004087 circulation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 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
- 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 relates to a kind of modular multilevel converter valve for flexible DC power transmission system, and this converter valve structure applications, in high-voltage large-capacity flexible DC power transmission system (VSC-HVDC), can realize remote conveying and the control of electric energy.The purpose of this utility model is to provide a kind of advantage of giving full play to different submodules, avoids the novel converter valve topological structure of the shortcoming of the converter valve of single type submodule formation simultaneously.Valve group is every comprises upper and lower 2 brachium pontis mutually; Each brachium pontis forms by several submodules; In each brachium pontis, at least comprise the submodule of 2 kinds of Basic Topologicals; Between same brachium pontis submodule, be connected in series.The Basic Topological of submodule is half-bridge structure, full bridge structure, clamp Shuangzi modular structure or other structures.This converter valve adopts overhead wire as DC power transmission line, is applied in the flexible DC power transmission system of 10kV and above voltage.
Description
Technical field
The utility model relates to a kind of modular multilevel converter valve structure, and this converter valve structure applications, in high-voltage large-capacity flexible DC power transmission system (VSC-HVDC), can realize remote conveying and the control of electric energy.
Background technology
Flexible high pressure DC transmission system, claims again voltage-source type HVDC (High Voltage Direct Current) transmission system (VSC-HVDC), is the extremely superior long distance power transmission means of performance that are applied to electric power system.Its basic fundamental means are: turn on and off all controlled all-controlling power electronics device by employing, as switching devices such as IGBT, realize meritorious, the controlled and rapid response of idle height.DC transmission system, without reactive effect and the capacity effect of AC system, can realize the remote delivery of electrical energy of high power density under low-loss level, and can not cause circuit on the way the sky of distributed capacitance fill the overvoltage that effect causes.Therefore, flexible DC power transmission system is generally applied in isolated island power transmission, power plant's remote accessing, interconnected between different electrical networks (synchronous or asynchronous), the fields such as high reliability supply network.Especially remote isolated island power transmission at sea, the collection of sea long distance wind energy turbine set electric energy and access aspect, flexible high pressure direct current transportation is the different mode of best performance.
Converter valve is equipment most crucial in flexible DC power transmission system, and it is bearing the mutual conversion between alternating current and direct current, is the tie connecting between AC electric power systems and direct current power system.At present, the structure of flexible DC power transmission converter valve is divided into 2 level structures, 3 level structures and many level structure.The converter valve harmonic wave of many level structure is little, and voltage is high, is the common method of the large capacity flexible DC power transmission of solid line system.Wherein, the converter valve of modular multilevel (MMC) structure is that many level converter valve performance is the most excellent.It is large that it has electric current, is easy to be applied to high voltage occasion, and low to power device requirement, manufacture difficulty is little, controls the advantages such as relatively simple.Its basic structure can be referring to Fig. 1.
Submodule 1 in Fig. 1 in modular multilevel converter valve, according to circuit Basic Topological, at least can be divided into half-bridge submodule (Fig. 2), full-bridge submodule (Fig. 3) and clamp Shuangzi module (Fig. 4).In addition, also has the submodule of other Basic Topologicals.
The converter valve being formed by half-bridge submodule (Fig. 2), each module is only used 10 and 2 diodes 9 of 2 full control devices, and cost is minimum.It has 3 kinds of operating states, that is:
1) blocking: T
1, T
2all cut-offs.Electric current by B through D
2flow to A, between A, B, be equivalent to short circuit; Or by A through D
1, C flows to B, capacitor charging.When normal operation, do not allow to occur this state.
2) input state: T
1open-minded, T
2cut-off.Electric current by B through C, T
1flow to A, module capacitors electric discharge; Or by A through D
1, C flows to B, capacitor charging.Now between A, B, voltage is condenser voltage.
3) bypass condition: T
2open-minded, T
1cut-off.Electric current by B through D
2flow to A, or by A through T
2flow to B.Now between A, B, voltage is only D
2or T
2forward voltage drop, be almost 0.
In the time that direct current system is short-circuited fault, control system is sent locking order, and module works in blocking.If short circuit current flows to A by B, due to diode D in submodule
2form current path, in this path, there is no to control the equipment of short circuit current, thus cause short circuit current and short circuit current rate of change excessive.If do not install DC circuit breaker, Fig. 2 half-bridge submodule is not suitable for the occasion that short trouble probability is higher.
The converter valve being formed by full-bridge submodule (Fig. 3), each module at least comprises 10 and 4 diodes 9 of 4 full control devices, and cost is the highest.It has 4 kinds of operating states, that is:
1) blocking: T
1, T
2, T
3, T
4all cut-offs.Electric current by A through D
1, C, D
4flow to B, or by B through D
2, C, D
3flow to A; Or.Regardless of the sense of current between A, B, capacitor is all in charged state.When normal operation, do not allow to occur this state.
2) forward drops into state: T
1, T
4open-minded, T
2, T
3cut-off.Electric current by A through D
1, C, D
4flow to B, module capacitors charging; Or by B through T
4, C, T
1flow to A, capacitor discharge.Now between A, B, voltage is capacitor forward voltage.
3) oppositely drop into state: T
2, T
3open-minded, T
1, T
4cut-off.Electric current by A through T
3, C, T
2flow to B, module capacitors electric discharge; Or by B through D
2, C, D
3flow to A, capacitor charging.Now between A, B, voltage is capacitor negative voltage.
4) bypass condition or excision state: T
1, T
2open-minded, T
3, T
4cut-off; Or T
1, T
2cut-off, T
3, T
4open-minded.Now Fig. 3 full-bridge submodule works in bypass condition, and between A, B, voltage is almost 0.
In the time that direct current system is short-circuited fault, Fig. 3 full-bridge submodule enters rapidly blocking, and according to above-mentioned narration, capacitor 8 is in charged state, thereby plays the effect of limiting short-circuit current and short circuit current rate of change.This submodule is applicable to the occasion that short trouble probability is higher.
The converter valve being formed by clamp Shuangzi module (Fig. 4), at least comprise 10 and 7 diodes 9 and 11 of 5 full control devices, but the required submodule quantity of converter (Fig. 1) is only the half of half-bridge submodule converter valve and full-bridge submodule converter valve, overall cost is between half-bridge submodule converter valve and full-bridge submodule converter valve.It has 4 kinds of operating states, that is:
1) blocking: T
11, T
12, T
21, T
22, T
0all cut-offs.Electric current by A through D
11, C
1, D
0, C
2, D
21flow to B, between A, B, voltage is 2 times of single condenser voltages; Or by B through D
22, C
2, D
23, D
13, C
1, D
12flow to A (wherein, C
2-D
23, D
13-C
1two branch circuit parallel connections),, between A, B, voltage is capacitor C
1or C
2voltage.Regardless of the sense of current between A, B, capacitor is all in charged state.When normal operation, do not allow to occur this state.
2) normal operation mode: the T in guiding loop 11
0remain conducting, to guide loop 11 as boundary, left and right is respectively a half-bridge submodule (Fig. 2), because clamp diode 13 is D
13with D
23one-way conduction characteristic, two half-bridge submodules are equivalent to be connected in series, and are equal to the characteristic of two half-bridge submodules in external behavior.Now between A, B, voltage is 2 times of capacitor forward voltages of capacitor or 1 times of capacitor forward voltage.
3) bypass condition or excision state: similar with normal operation mode, when two half-bridge submodules are during all in bypass condition, whole clamp Shuangzi module (Fig. 4) is in bypass condition or excision state, and between A, B, voltage is almost 0.
In the time that direct current system is short-circuited fault, whole clamp Shuangzi module (Fig. 4) enters rapidly blocking, regardless of short circuit current direction, certainly exists the capacitor C of the forward voltage of two or serial or parallel connection in short-circuit current paths
1, C
2, be equivalent to charge to capacitor, thereby play the effect of limiting short-circuit current and short circuit current rate of change, applicable to the higher occasion of short trouble probability.
Existing converter valve all adopts the submodule of single type, submodule quantity on each brachium pontis is identical, the advantage of the submodule that the converter valve of this structure can not make full use of different topology structure on performance or cost, the converter valve of manufacturing or cost are low but cannot limiting short-circuit current, or can limiting short-circuit current but cost is too high.
Summary of the invention
The purpose of this utility model is to provide a kind of advantage of giving full play to different submodules, avoid the novel converter valve topological structure of the shortcoming of the converter valve of single type submodule formation simultaneously, this topological structure is for flexible DC power transmission system, and cost is low, and effective limiting short-circuit current.
For achieving the above object, the utility model is achieved through the following technical solutions:
For a modular multilevel converter valve for flexible DC power transmission system, described converter valve is every comprises upper and lower 2 brachium pontis mutually; Each brachium pontis is connected in series formation by several submodules; In each brachium pontis, at least comprise the submodule of 2 kinds of Basic Topologicals; Upper and lower 2 brachium pontis of described converter valve form a facies unit, and each facies unit is connected in parallel.
Described submodule Basic Topological is half-bridge structure, full bridge structure, clamp Shuangzi modular structure or other structures.
In described submodule, at least comprise the submodule of 1 half-bridge structure.
In described each brachium pontis, comprise 2 kinds of Basic Topological submodules, two kinds of submodules adopt half-bridge and full bridge structure; Or employing half-bridge structure and clamp Shuangzi modular structure.
The submodule quantity of the described different brachium pontis of converter valve can be identical, also can be different.
Described converter valve is applied in the flexible DC power transmission system of 10kV and above voltage.
Described converter valve adopts overhead wire as DC power transmission line; Described converter valve can be connected with AC system by valve reactor; Described converter valve can be connected with AC system by switchgear.
Compared with prior art, the utility model has the advantages that:
1) the utility model can make full use of 2 kinds or two or more submodule advantage separately, overcomes its shortcoming, realizes the flexible direct current converter valve that is applicable to high voltage direct current overhead wire under lower cost.
In the time that these 2 kinds of submodules adopt half-bridge and full bridge structure, taking half-bridge module as brachium pontis main body, coordinate a small amount of full-bridge module, the cost of whole valve group is only a little more than the complete valve group of half-bridge module, the valve group that is significantly less than complete full-bridge module, cost is lower, and control method is relatively simple.Meanwhile, when dc-side short-circuit, contain a small amount of full bridge structure submodule in short-circuit current paths, the capacitor in these full-bridge submodules can suppress climbing and the size of short circuit current, thereby possesses the advantage of complete full-bridge submodule valve group.
In the time that these 2 kinds of submodules adopt half-bridge and clamp Shuangzi modular structure, taking half-bridge module as brachium pontis main body, coordinate a small amount of clamp Shuangzi module, the cost of whole valve group is only a little more than the complete valve group by clamp Shuangzi module composition, be significantly less than the valve group of complete clamp Shuangzi modular structure, cost is lower, and control method is relatively simple.Meanwhile, when dc-side short-circuit, contain a small amount of clamp Shuangzi module in short-circuit current paths, the capacitor in these clamp Shuangzi modules can suppress climbing and the size of short circuit current, thereby possesses the advantage of the complete valve group by clamp Shuangzi module composition.
2) converter valve group described in the utility model; if taking certain a kind of submodule as main body; other a kind or several module are auxiliary; the control protection system that main body submodule is developed can only be carried out a small amount of amendment and be can be applicable to new valve group; original control model also can maximum magnitude retain, the workload of again developing and debugging is less.
3) converter valve group described in the utility model, if taking the submodule of loss minimum as main body, other a kind or several module are auxiliary, loss is mainly produced by main body submodule, valve group overall losses is close to the valve group being made up of main body submodule completely, can increase the advantage of bringing into play other structon modules few in the situation that in loss.
Brief description of the drawings
Fig. 1 is modular multilevel converter valve group circuit diagram.
Fig. 2 is submodule (H-SM) the basic circuit structure figure of half-bridge structure.
Fig. 3 is submodule (F-SM) the basic circuit structure figure of full bridge structure.
Fig. 4 is submodule (C-SM) the basic circuit structure figure of clamp Shuangzi modular structure.
In Fig. 1～Fig. 4:
1 is submodule (SM, submodule), and the structure of each submodule (SM) does not require identical
2 is upper brachium pontis
3 is valve reactor
4 is lower brachium pontis
5 is a facies unit
6 is direct-current polar
7 is a valve group
8 is submodule capacitor
9 is diode
10 is full control device
11 is the full control device (as IGBT) in clamp Shuangzi module booting loop
12 is the anti-paralleled diode in clamp Shuangzi module booting loop
13 is clamping diode
Fig. 5 is that submodule is the modular multilevel converter valve group topological diagram of half-bridge structure and clamp Shuangzi modular structure.
Fig. 6 is that submodule is the modular multilevel converter valve group topological diagram of half-bridge structure and full bridge structure.
Embodiment
Below in conjunction with accompanying drawing, technology contents of the present utility model is described in further detail.
Embodiment 1
With reference to Fig. 5, taking the submodule (Fig. 2, H-SM) of N1 half-bridge structure as main body, N2 the clamp Shuangzi module (Fig. 4, C-SM) of connecting in brachium pontis.Under normal circumstances, in order to save cost, N1 is greater than N2.
When normal operation, full control device in clamp Shuangzi module (C-SM) guiding loop is open-minded, whole module is equivalent to two half-bridge submodule (Fig. 2, H-SM) series connection, thereby two equivalent half-bridge submodules of the control method control clamp Shuangzi module (C-SM) of half-bridge submodule routinely.
In the time there is DC side fault, all modules are controlled device locking entirely.In Fig. 5, after N1 half-bridge submodule (Fig. 2, H-SM) locking, short circuit current is by the diode circulation between output.And in clamp Shuangzi module (C-SM), device locking is controlled in guiding loop entirely, make this loop be equivalent to open circuit.So short circuit current is by 2 anti-paralleled diodes and two direct current capacitor circulations, by capacitor limits within the specific limits, meanwhile, short circuit current is blocked rapidly by diode and full control device for its amplitude and rate of change.
Embodiment 2
With reference to Fig. 6, taking the submodule (Fig. 2, H-SM) of N1 half-bridge structure as main body, N2 the full-bridge submodule (Fig. 3, F-SM) of connecting in brachium pontis.Under normal circumstances, in order to save cost, N1 is greater than N2.
When normal operation, full-bridge submodule (F-SM) participates in converter valve control with half-bridge submodule (H-SM) simultaneously, adopts common control mode.In the time there is DC side fault, all modules are controlled device locking entirely.In Fig. 6, after N1 half-bridge submodule (Fig. 2, H-SM) locking, short circuit current is by the diode circulation between output.And in full-bridge submodule (F-SM), short circuit current is by 2 anti-paralleled diodes and direct current capacitor circulation, by capacitor limits within the specific limits, meanwhile, short circuit current is blocked rapidly by diode and full control device for its amplitude and rate of change.
Above embodiment has exemplified the valve group of half-bridge structure submodule and clamp Shuangzi module composition and the valve group of half-bridge structure submodule and full-bridge submodule formation.For the submodule of other structures and the valve group constituting thereof, all within rights protection scope of the present utility model.
Claims (6)
1. for a modular multilevel converter valve for flexible DC power transmission system, it is characterized in that, described converter valve is every comprises upper and lower 2 brachium pontis mutually; Each brachium pontis is connected in series formation by several submodules; In each brachium pontis, at least comprise the submodule of 2 kinds of Basic Topologicals; Upper and lower 2 brachium pontis of described converter valve form a facies unit, and each facies unit is connected in parallel.
2. a kind of modular multilevel converter valve for flexible DC power transmission system according to claim 1, is characterized in that, described submodule Basic Topological is half-bridge structure, full bridge structure or clamp Shuangzi modular structure.
3. a kind of modular multilevel converter valve for flexible DC power transmission system according to claim 1, is characterized in that, at least comprises the submodule of 1 half-bridge structure in described submodule.
4. a kind of modular multilevel converter valve for flexible DC power transmission system according to claim 1, is characterized in that, comprises 2 kinds of Basic Topological submodules in described each brachium pontis, and two kinds of submodules adopt half-bridge and full bridge structure; Or employing half-bridge structure and clamp Shuangzi modular structure.
5. a kind of modular multilevel converter valve for flexible DC power transmission system according to claim 1, is characterized in that, the submodule quantity of the described different brachium pontis of converter valve can be identical, also can be different.
6. a kind of modular multilevel converter valve for flexible DC power transmission system according to claim 1, is characterized in that, described converter valve is applied in the flexible DC power transmission system of 10kV and above voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420288038.9U CN203968008U (en) | 2014-05-30 | 2014-05-30 | A kind of modular multilevel converter valve for flexible DC power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420288038.9U CN203968008U (en) | 2014-05-30 | 2014-05-30 | A kind of modular multilevel converter valve for flexible DC power transmission system |
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| Publication Number | Publication Date |
|---|---|
| CN203968008U true CN203968008U (en) | 2014-11-26 |
Family
ID=51928549
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|---|---|---|---|
| CN201420288038.9U Expired - Lifetime CN203968008U (en) | 2014-05-30 | 2014-05-30 | A kind of modular multilevel converter valve for flexible DC power transmission system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022666A (en) * | 2014-05-30 | 2014-09-03 | 荣信电力电子股份有限公司 | Modularization multi-level converter valve for flexible DC power transmission system |
| CN104578130A (en) * | 2015-01-08 | 2015-04-29 | 南京南瑞继保电气有限公司 | Hybrid direct-current transmission converter and direct-current transmission device |
| CN104836250A (en) * | 2015-05-29 | 2015-08-12 | 国网智能电网研究院 | Novel interpolar current transfer switch |
| AT516643A1 (en) * | 2014-12-18 | 2016-07-15 | Schneider Electric Power Drives Gmbh | Rectifier circuit |
| CN106230283A (en) * | 2016-09-30 | 2016-12-14 | 广州供电局有限公司 | Sending end Multilevel Inverters for power one-way transmission occasion |
| CN106505897A (en) * | 2016-12-29 | 2017-03-15 | 华北电力大学 | A kind of low-loss MMC submodules topology for possessing DC Line Fault ride-through capability |
-
2014
- 2014-05-30 CN CN201420288038.9U patent/CN203968008U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022666A (en) * | 2014-05-30 | 2014-09-03 | 荣信电力电子股份有限公司 | Modularization multi-level converter valve for flexible DC power transmission system |
| AT516643A1 (en) * | 2014-12-18 | 2016-07-15 | Schneider Electric Power Drives Gmbh | Rectifier circuit |
| AT516643B1 (en) * | 2014-12-18 | 2018-02-15 | Schneider Electric Power Drives Gmbh | Rectifier circuit |
| CN104578130A (en) * | 2015-01-08 | 2015-04-29 | 南京南瑞继保电气有限公司 | Hybrid direct-current transmission converter and direct-current transmission device |
| CN104836250A (en) * | 2015-05-29 | 2015-08-12 | 国网智能电网研究院 | Novel interpolar current transfer switch |
| CN106230283A (en) * | 2016-09-30 | 2016-12-14 | 广州供电局有限公司 | Sending end Multilevel Inverters for power one-way transmission occasion |
| CN106505897A (en) * | 2016-12-29 | 2017-03-15 | 华北电力大学 | A kind of low-loss MMC submodules topology for possessing DC Line Fault ride-through capability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 114051, Liaoning, Anshan MTR Eastern Science and technology road, No. 108 Patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Address before: 114051 Anshan high tech Zone, Liaoning province science and technology road, No. 108 Patentee before: RONGXIN POWER ELECTRONIC Co.,Ltd. |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Assignor: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Contract record no.: 2017210000040 Denomination of utility model: Modularization multi-level converter valve for flexible DC power transmission system Granted publication date: 20141126 License type: Common License Record date: 20171212 |
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| EE01 | Entry into force of recordation of patent licensing contract | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200131 Address after: 114000 Anshan province Liaoning City Tiedong Mountain Road No. 212 Patentee after: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Address before: 114051, No. 108, science Road, MTR East, Liaoning, Anshan Patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee after: Rongxin Huike Electric Co.,Ltd. Address before: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee before: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141126 |
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| CX01 | Expiry of patent term |