CN106981980A - A kind of full-bridge MMC starts control method and system - Google Patents
A kind of full-bridge MMC starts control method and system Download PDFInfo
- Publication number
- CN106981980A CN106981980A CN201710247435.XA CN201710247435A CN106981980A CN 106981980 A CN106981980 A CN 106981980A CN 201710247435 A CN201710247435 A CN 201710247435A CN 106981980 A CN106981980 A CN 106981980A
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- bridge arm
- bridge
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- current
- mmc
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
Start control method and system the invention provides a kind of full-bridge MMC, the system includes three-phase bridge arm, three-phase bridge arm includes upper bridge arm and lower bridge arm, and upper bridge arm and lower bridge arm are in series with the auxiliary circuit breaker included on FBSM averaging modules, each bridge arm for bypassing FBSM averaging modules respectively.In start-up course, unlocking signal need to be detected, and detects the sense of current of each bridge arm, if flowing through the electric current positive direction of bridge arm from top to bottom, when detecting the bridge arm current direction to bear, to close the auxiliary circuit breaker in parallel with the bridge arm, the bridge arm is bypassed；It is timing when detecting the bridge arm current direction, disconnect the auxiliary circuit breaker in parallel with the bridge arm, continue as the full-bridge MMC submodules charging on the bridge arm, unblock moment DC bus-bar voltage is set not produce very big mutation, the dash current at unblock moment is substantially reduced, the security reliability of system is improved.
Description
Technical field
The invention belongs to power system transmission ＆ distribution electro-technical field, more particularly to a kind of full-bridge MMC starts control method and is
System.
Background technology
With application of the development and Power Electronic Technique of all-controlling power electronics device in power system, based on voltage
The Technology of HVDC based Voltage Source Converter of source transverter is increasingly subject to pay attention to.Modularization multi-level converter (Modular multilevel
Concerter, MMC) be flexible direct current power transmission system application in voltage source converter one kind, it is by multiple submodule according to one
Fixed mode is formed by connecting, by controlling each submodule to realize the high efficiency of transmission of energy.
What the submodule of current MMC circuits was mainly used have HBSM (half-bridge submodule), CDSM (double clamp submodules) and
FBSM (full-bridge submodule), HBSM operational mode is simpler, but when occurring DC bipolar short trouble, HBSM compositions
MMC bridge arms can not effectively cut off faults itself electric current, and CDSM possesses the cut-out ability of the short circuit current flow of direct-current short circuit failure, but
The problem of trend upset is difficult when it has traditional LC C-HVDC construction multi-terminal HVDC transmission networks, and FBSM both possesses cut-out directly
The ability of flow short-circuit failed shorted electric current, also may be implemented in MMC DC currents it is constant on the premise of, it is only female by changing its direct current
Line voltage polarity realizes that trend is overturn.Therefore, it is especially suitable for and tradition using FBSM flexible direct current power transmission system MMC-HVDC
High voltage dc transmission technology LCC-HVDC constitutes Polynuclear complex network.
The MMC-HVDC being made up of FBSM is in start-up course, with the MMC-HVDC phases being made up of under the same terms HBSM
Than, its submodule voltage can only be charged to the half of half-bridge submodule voltage, and because the submodule of upper and lower bridge arm will be by complete
Ripple rectification and charge, now, the voltage that upper and lower bridge arm is alternately exported on the capacitance voltage of positive and negative, therefore dc bus is being opened
It is zero always during dynamic, makes DC bus-bar voltage mutation very big in unblock, the unblock moment will be caused to produce very big impact
Electric current, in the case of addition protection control, meeting protection blocking because of the dash current for unlocking the moment, or even tripping operation.
The content of the invention
Start control method and system it is an object of the invention to provide a kind of full-bridge MMC, for solving in unblock pair
The problem of dc bus produces very big dash current.
To achieve the above object, the technical scheme is that：
A kind of full-bridge MMC starts control method, comprises the following steps：
1) switching signal of three-phase alternating current breaker is detected, if detecting switching signal, full-bridge MMC input startups are filled
Electricity；
2) in start-up course, the sense of current of each bridge arm is detected, if the electric current positive direction for flowing through bridge arm is from upper
Under, when detecting the bridge arm current direction to bear, the auxiliary circuit breaker in parallel with the bridge arm is closed, the bridge arm is bypassed；When
The bridge arm current direction is detected for timing, the auxiliary circuit breaker in parallel with the bridge arm is disconnected, continues as the full-bridge on the bridge arm
MMC submodules charge.
Further, in start-up course, the sense of current is only put into per phase for positive bridge arm, and the bridge arm output voltage is
On the occasion of.
Start control system, including three-phase bridge arm present invention also offers a kind of full-bridge MMC, the three-phase bridge arm includes upper
Bridge arm and lower bridge arm, the upper bridge arm and lower bridge arm all include FBSM averaging modules, each FBSM average values respectively
The auxiliary circuit breaker for bypassing FBSM averaging modules is all parallel with module, in start-up course, each bridge arm is detected
The sense of current, if flowing through the electric current positive direction of bridge arm for from top to bottom, when detect the bridge arm current direction for it is negative when, closure with
Bridge arm auxiliary circuit breaker in parallel, the bridge arm is bypassed；When detecting the bridge arm current direction for timing, disconnect and the bridge arm
Auxiliary circuit breaker in parallel, continues as the full-bridge MMC submodules charging on the bridge arm.
Further, AC circuit breaker and boot leg are in series with respectively on the three-phase bridge arm AC bus.
Further, the boot leg is two branch roads in parallel, be wherein in series with tie point soft switch and
By-pass switch is in series with soft resistance, the second branch road.
Further, the FBSM averaging modules are the equivalent of the full-bridge MMC submodules of N number of cascade.
Further, in start-up course, the sense of current is only put into per phase for positive bridge arm, and the bridge arm output voltage is
On the occasion of.
The beneficial effects of the invention are as follows：
The full-bridge MMC that the present invention is provided starts control system, including three-phase bridge arm, and three-phase bridge arm includes upper bridge arm and lower bridge
Arm, upper bridge arm and lower bridge arm all include to be parallel with FBSM averaging modules, each FBSM averaging modules and are used for respectively
Bypass the auxiliary circuit breaker of FBSM averaging modules.In start-up course, the sense of current of each bridge arm is detected, if flowing through bridge arm
Electric current positive direction for from top to bottom, when detect the bridge arm current direction for it is negative when, close the auxiliary in parallel with the bridge arm disconnected
Road device, the bridge arm is bypassed；When detecting the bridge arm current direction for timing, the auxiliary circuit breaker in parallel with the bridge arm is disconnected,
The full-bridge MMC submodules charging on the bridge arm is continued as, dc bus side voltage is slowly raised, moment direct current is so unlocked female
Line voltage will not produce very big mutation, substantially reduce the dash current at unblock moment, improve the security reliability of system.
Brief description of the drawings
The MMC schematic diagrames that Fig. 1 is constituted for the full-bridge submodule averaging module of the present invention；
Fig. 2 is the logic diagram of the implementation method of differential protection of the present invention.
Embodiment
The embodiment to the present invention is further described below in conjunction with the accompanying drawings：
A kind of full-bridge MMC of the present invention starts the embodiment of control system：
A kind of full-bridge MMC starts control system, including three-phase alternating current bridge arm, and three-phase alternating current bridge arm includes upper bridge arm and lower bridge
Arm, upper bridge arm and lower bridge arm all include to be parallel with FBSM averaging modules, each FBSM averaging modules and are used for respectively
The auxiliary circuit breaker of FBSM averaging modules is bypassed, wherein, FBSM averaging modules are the full-bridge MMC submodules of N number of cascade
It is equivalent；AC circuit breaker and boot leg are in series with respectively on three-phase bridge arm AC bus；The boot leg is two parallel connections
Branch road, be in series with by-pass switch wherein being in series with a branch road on soft switch and soft resistance, another branch road.
Specifically as shown in figure 1, all including FBSM mean value models respectively on bridge arm and lower bridge arm on three-phase alternating current,
Auxiliary circuit breaker VLVAP, VLVAN, VLVBP, VLVBN, VLVCP, VLVCN, A are parallel with each FBSM mean value models respectively
AC circuit breaker KMA and boot leg are in series with cross streams bus, the boot leg includes switching SofauA by soft and soft
Play the resistance tie point being composed in series and the second branch road being made up of by-pass switch SofmainA；Connected on B cross streams buses
There are AC circuit breaker KMB and boot leg, the boot leg includes what switch SofauB and soft resistance by soft were composed in series
Tie point and the second branch road being made up of by-pass switch SofmainB；Be in series with C cross streams buses AC circuit breaker KMC and
Boot leg, the boot leg includes the tie point and opened by bypass that switch SofauC and soft resistance are composed in series by soft
Close the second branch road of SofmainC compositions.
Starting the method controlled to full-bridge MMC using the full-bridge MMC startup control systems of the present invention is：
Three-phase alternating current breaker KMA, KMB and KMC are closed, the switching signal of three-phase alternating current breaker is detected, if detecting
Switching signal, start charging, and close soft in boot leg switch SofauA, SofauB and SofauC, it is soft by AC
Play resistance exchange stream device full-bridge submodule and carry out positive half-wave and the charging of negative half-wave, until full-bridge submodule voltage reaches stable state, keep away
Exempt from directly to charge to full-bridge submodule with high current, the damage that IGBT is switched in full-bridge submodule is caused, then by all full-bridges
Specific switch device conductive in submodule, voltage again stablize after, closure by-pass switch SofmainA, SofmainB and
SofmainC, bypasses soft resistance, continues to charge to full-bridge submodule.
As shown in Fig. 2 KM is the signal for closing AC circuit breaker, when detecting KM rising edge, now unlocking signal
For low level, it is 1 to start input and start the R of logic, i.e. rest-set flip-flop for 0, S, and output Q (BypassEN) is 1, when detecting solution
Lock signal, now AC circuit breaker KM signals are that the R of low level, i.e. rest-set flip-flop is that 1, S is 0, and output Q (BypassEN) is 0,
Stop input and start logic.
When detecting unlocking signal, the sense of current of each bridge arm in detection start-up course, if flowing through the electric current of bridge arm
Positive direction is from top to bottom, by taking A cross streams bridge arms as an example, when upper bridge arm (the i.e. FBSM mean value models) electricity for detecting the bridge arm
When flowing direction to bear, the auxiliary circuit breaker VLVAP in parallel with the bridge arm is closed, the bridge arm is bypassed, its output voltage is zero；When
The bridge arm current direction is detected for timing, the auxiliary circuit breaker in parallel with the bridge arm is disconnected, continues as the full-bridge on the bridge arm
MMC submodules charge, its submodule output positive voltage, wherein, the control logic of breaker is as shown in Fig. 2 by electric current iapWith 0 ratio
Compared with if iapLess than 0, then comparator output terminal is output as 1, and output 1 and rest-set flip-flop output end are exported into BypassEN phases and control
Breaker VLVAP closures processed.In start-up course, a bridge arm is only put into per phase, DC bus-bar voltage is gradually risen best friend
Side line voltage peak is flowed, DC bus-bar voltage will not be mutated very greatly in unblock, greatly reduce the dash current at unblock moment, be protected
Demonstrate,prove system stable operation.
Start control method present invention also offers a kind of full-bridge MMC, its embodiment is in above formula embodiment
In be described in detail, repeat no more herein.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, design each
Plant the model deformed, formula, parameter and creative work need not be spent.In the principle and the situation of spirit for not departing from the present invention
Under to embodiment carry out change, modification, replacement and modification still fall within protection scope of the present invention.
Claims (7)
1. a kind of full-bridge MMC starts control method, it is characterised in that this method comprises the following steps：
1) switching signal of three-phase alternating current breaker is detected, if detecting switching signal, full-bridge MMC inputs start charging；
2) in start-up course, the sense of current of each bridge arm is detected, if the electric current positive direction for flowing through bridge arm is from top to bottom, when
When detecting the bridge arm current direction to bear, the auxiliary circuit breaker in parallel with the bridge arm is closed, the bridge arm is bypassed；When detecting
The bridge arm current direction is timing, disconnects the auxiliary circuit breaker in parallel with the bridge arm, continues as the full-bridge MMC submodules on the bridge arm
Block charges.
2. full-bridge MMC according to claim 1 starts control method, it is characterised in that in start-up course, only thrown per phase
Enter the sense of current for positive bridge arm, and the bridge arm output voltage be on the occasion of.
3. a kind of full-bridge MMC starts control system, including three-phase bridge arm, the three-phase bridge arm includes upper bridge arm and lower bridge arm, institute
State bridge arm and lower bridge arm all includes FBSM averaging modules respectively, it is characterised in that each FBSM averaging modules
On be all parallel with auxiliary circuit breaker for bypassing FBSM averaging modules, in start-up course, detect the electric current of each bridge arm
Direction, if flowing through the electric current positive direction of bridge arm from top to bottom, when detecting the bridge arm current direction to bear, to close and the bridge
Arm auxiliary circuit breaker in parallel, the bridge arm is bypassed；When detecting the bridge arm current direction for timing, disconnect in parallel with the bridge arm
Auxiliary circuit breaker, continue as on the bridge arm full-bridge MMC submodules charging.
4. full-bridge MMC according to claim 3 starts control system, it is characterised in that the three-phase bridge arm AC is female
AC circuit breaker and boot leg are in series with line respectively.
5. full-bridge MMC according to claim 4 starts control system, it is characterised in that the boot leg be two simultaneously
It is in series with the branch road of connection, wherein tie point on soft switch and soft resistance, the second branch road and is in series with by-pass switch.
6. full-bridge MMC according to claim 3 starts control system, it is characterised in that the FBSM averaging modules are N
The full-bridge MMC submodules of individual cascade it is equivalent.
7. the full-bridge MMC according to claim any one of 3-6 starts control system, it is characterised in that in start-up course,
The sense of current is only put into per phase for positive bridge arm, and the bridge arm output voltage be on the occasion of.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247435.XA CN106981980A (en) | 2017-04-14 | 2017-04-14 | A kind of full-bridge MMC starts control method and system |
| PCT/CN2017/113666 WO2018188350A1 (en) | 2017-04-14 | 2017-11-29 | Full-bridge mmc activation control method, system, and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710247435.XA CN106981980A (en) | 2017-04-14 | 2017-04-14 | A kind of full-bridge MMC starts control method and system |
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| Publication Number | Publication Date |
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| CN106981980A true CN106981980A (en) | 2017-07-25 |
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| CN201710247435.XA Pending CN106981980A (en) | 2017-04-14 | 2017-04-14 | A kind of full-bridge MMC starts control method and system |
Country Status (2)
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| CN (1) | CN106981980A (en) |
| WO (1) | WO2018188350A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546726A (en) * | 2017-09-20 | 2018-01-05 | 湖南省湘电试研技术有限公司 | Intensive DC de-icing device SVG power models bypass structure and its control method |
| WO2018188350A1 (en) * | 2017-04-14 | 2018-10-18 | 许继集团有限公司 | Full-bridge mmc activation control method, system, and storage medium |
| CN109494971A (en) * | 2018-10-11 | 2019-03-19 | 特变电工新疆新能源股份有限公司 | A kind of flexible HVDC transmission system DC bus be shorted in the case of starting strategy |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112440768B (en) * | 2019-09-05 | 2022-07-15 | 比亚迪股份有限公司 | Charging control method, charging control module and storage medium thereof |
| CN113051753B (en) * | 2021-03-22 | 2023-02-24 | 南方电网科学研究院有限责任公司 | Reliability calculation method and system for submodule of modular multilevel converter system |
| CN113595075B (en) * | 2021-08-04 | 2022-06-17 | 全球能源互联网研究院有限公司 | Starting method and device of low-frequency power transmission system |
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| Publication number | Publication date |
|---|---|
| WO2018188350A1 (en) | 2018-10-18 |
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Application publication date: 20170725 |