CN104022666A - Modularization multi-level converter valve for flexible DC power transmission system - Google Patents
Modularization multi-level converter valve for flexible DC power transmission system Download PDFInfo
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- CN104022666A CN104022666A CN201410238350.1A CN201410238350A CN104022666A CN 104022666 A CN104022666 A CN 104022666A CN 201410238350 A CN201410238350 A CN 201410238350A CN 104022666 A CN104022666 A CN 104022666A
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- converter valve
- submodule
- power transmission
- flexible
- transmission system
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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 invention relates to a modularization multi-level converter valve for a flexible DC power transmission system. The converter valve structure is applied to a high-voltage large-capacity flexible DC power transmission system (VSC-HVDC) and can realize long-distance transmission and control of electric energy. The purpose of the invention is to provide a novel converter valve topology structure which gives full play to the advantages of different submodules and avoids the disadvantages of a converter valve composed of a single-type submodule at the same time. Each phase of a valve block comprises an upper leg and a lower leg; each leg is composed of a plurality of submodules; each leg at least internally comprises submodules of two basic topology structures; and the submodules of the same leg are connected in series. The basic topology structures of the submodules are high-bridge structures, full-bridge structures, clamp double-submodule structures or other structures. The converter valve provided by the invention employs an overhead line as a DC power transmission line and is applied to a flexible DC power transmission system with voltage of 10 kV and above.
Description
Technical field
The present invention relates to a kind of modular multilevel converter valve structure, (step is C-H step DC core only, can realize remote conveying and the control of electric energy in high-voltage large-capacity flexible DC power transmission system for this converter valve structure applications.
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: by employing, turn on and off all controlled all-controlling power electronics device, 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 at sea remote isolated island power transmission, 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, the submodule that also has other Basic Topologicals.
The converter valve being formed by half-bridge submodule (Fig. 2), each module is only used 2 full control devices 10 and 2 diodes 9, 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.During 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.
When 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
2the current path forming, in this path, does not have 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 4 full control devices 10 and 4 diodes 9, 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.During 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.
When 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 5 full control devices 10 and 7 diodes 9 and 11, but the required submodule quantity of converter (Fig. 1) is only half-bridge submodule converter valve and full-bridge submodule converter valve half, and 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.During normal operation, do not allow to occur this state.
2) normal operation mode: the T in guiding loop 11
0remain conducting, take and 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.
When 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 object of this invention 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 that single type submodule forms 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 present invention 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 each described 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 10k step 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, advantage of the present invention is:
1) the present invention 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.
When these 2 kinds of submodules adopt half-bridge and full bridge structure, take 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, during 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.
When these 2 kinds of submodules adopt half-bridge and clamp Shuangzi modular structure, take 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, during dc-side short-circuit
mainin short-circuit current paths, contain a small amount of clamp Shuangzi module, 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 of the present invention; if take certain a kind of submodule, it is 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 modification 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 of the present invention, if the submodule of loss minimum of take is 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 comprised of main body submodule completely, can increase the advantage of bringing into play other structon modules few in the situation that in loss.
Accompanying drawing explanation
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 invention is described in further detail.
Embodiment 1
With reference to Fig. 5, the submodule (Fig. 2, H-SM) of N1 half-bridge structure of take is main body, N2 the clamp Shuangzi module (Fig. 4, C-SM) of connecting in brachium pontis.Generally, in order to save cost, N1 is greater than N2.
During 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, thus the control method of half-bridge submodule is controlled two equivalent half-bridge submodules of clamp Shuangzi module (C-SM) routinely.
When 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 circulates by the diode 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 circulates by 2 anti-paralleled diodes and two direct current capacitors, 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, the submodule (Fig. 2, H-SM) of N1 half-bridge structure of take is main body, N2 the full-bridge submodule (Fig. 3, F-SM) of connecting in brachium pontis.Generally, in order to save cost, N1 is greater than N2.
During normal operation, full-bridge submodule (F-SM) participates in converter valve with half-bridge submodule (H-SM) simultaneously and controls, and adopts common control mode.When 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 circulates by the diode between output.And in full-bridge submodule (F-SM), short circuit current circulates by 2 anti-paralleled diodes and direct current capacitor, 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 the scope of the present invention.
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 each described 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.
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|---|---|---|---|
| CN201410238350.1A CN104022666A (en) | 2014-05-30 | 2014-05-30 | Modularization multi-level converter valve for flexible DC power transmission system |
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|---|---|---|---|
| CN201410238350.1A CN104022666A (en) | 2014-05-30 | 2014-05-30 | Modularization multi-level converter valve for flexible DC power transmission system |
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|---|---|
| CN104022666A true CN104022666A (en) | 2014-09-03 |
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|---|---|---|---|
| CN201410238350.1A Pending CN104022666A (en) | 2014-05-30 | 2014-05-30 | Modularization multi-level converter valve for flexible DC power transmission system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601017A (en) * | 2014-12-25 | 2015-05-06 | 清华大学 | Modularized multi-level converter being able to traverse direct current short circuit fault |
| CN105119508A (en) * | 2015-09-18 | 2015-12-02 | 山东建筑大学 | Modularized multi-level current converter with hybrid-cascaded full-bridge and half-bridge sub-modules and starting method thereof |
| CN105140961A (en) * | 2015-09-11 | 2015-12-09 | 中国能源建设集团广东省电力设计研究院有限公司 | Hybrid direct-current power transmission device used for new energy grid connection and power transmission method thereof |
| CN105553314A (en) * | 2015-12-21 | 2016-05-04 | 哈尔滨工业大学 | Hybrid modular multilevel converter topological structure based on three-level submodules and two-level submodules |
| AT516643A1 (en) * | 2014-12-18 | 2016-07-15 | Schneider Electric Power Drives Gmbh | Rectifier circuit |
| CN104320011B (en) * | 2014-10-20 | 2017-04-19 | 西安许继电力电子技术有限公司 | Hybrid sub-module MMC converter with direct-current fault ride-through capability |
| CN106787087A (en) * | 2017-01-09 | 2017-05-31 | 许继集团有限公司 | Hybrid MMC sequences pressure charging method, startup method and device |
| WO2018024207A1 (en) * | 2016-08-05 | 2018-02-08 | 南京南瑞继保电气有限公司 | Reconfigurable mmc sub-module unit and control unit thereof |
| CN107910886A (en) * | 2017-12-12 | 2018-04-13 | 荣信汇科电气技术有限责任公司 | Submodule topological structure and method for flexible direct-current transmission converter valve |
| CN109687687A (en) * | 2017-10-19 | 2019-04-26 | 南京南瑞继保电气有限公司 | A kind of wear leveling control method and device of full-bridge submodule |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104320011B (en) * | 2014-10-20 | 2017-04-19 | 西安许继电力电子技术有限公司 | Hybrid sub-module MMC converter with direct-current fault ride-through capability |
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| CN104601017B (en) * | 2014-12-25 | 2017-01-25 | 清华大学 | Modularized multi-level converter being able to traverse direct current short circuit fault |
| CN105140961A (en) * | 2015-09-11 | 2015-12-09 | 中国能源建设集团广东省电力设计研究院有限公司 | Hybrid direct-current power transmission device used for new energy grid connection and power transmission method thereof |
| CN105119508B (en) * | 2015-09-18 | 2017-09-22 | 山东建筑大学 | Full-bridge and the modularization multi-level converter and startup method of half-bridge submodule series-parallel connection |
| CN105119508A (en) * | 2015-09-18 | 2015-12-02 | 山东建筑大学 | Modularized multi-level current converter with hybrid-cascaded full-bridge and half-bridge sub-modules and starting method thereof |
| CN105553314A (en) * | 2015-12-21 | 2016-05-04 | 哈尔滨工业大学 | Hybrid modular multilevel converter topological structure based on three-level submodules and two-level submodules |
| WO2018024207A1 (en) * | 2016-08-05 | 2018-02-08 | 南京南瑞继保电气有限公司 | Reconfigurable mmc sub-module unit and control unit thereof |
| US10523131B2 (en) | 2016-08-05 | 2019-12-31 | Nr Electric Co., Ltd | Reconfigurable MMC sub-module unit and control unit thereof |
| CN106787087A (en) * | 2017-01-09 | 2017-05-31 | 许继集团有限公司 | Hybrid MMC sequences pressure charging method, startup method and device |
| CN109687687A (en) * | 2017-10-19 | 2019-04-26 | 南京南瑞继保电气有限公司 | A kind of wear leveling control method and device of full-bridge submodule |
| CN107910886A (en) * | 2017-12-12 | 2018-04-13 | 荣信汇科电气技术有限责任公司 | 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 |
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Application publication date: 20140903 |