CN106374495A - Modular multilevel electrical railway power grid side electric energy quality optimization current transformer - Google Patents
Modular multilevel electrical railway power grid side electric energy quality optimization current transformer Download PDFInfo
- Publication number
- CN106374495A CN106374495A CN201611001639.7A CN201611001639A CN106374495A CN 106374495 A CN106374495 A CN 106374495A CN 201611001639 A CN201611001639 A CN 201611001639A CN 106374495 A CN106374495 A CN 106374495A
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- China
- Prior art keywords
- mmc module
- electric
- current transformer
- electric energy
- energy quality
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- 238000005457 optimization Methods 0.000 title claims abstract 5
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 230000003137 locomotive effect Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 abstract 3
- 238000011105 stabilization Methods 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides relates to a modular multilevel electrical railway power grid side electric energy quality optimization current transformer which consists of a first MMC module (1), a second MMC module (3) and a direct current voltage stabilization capacitor group (2), wherein an alternating current side of the first MMC module (1) is connected with a 220 kV or 110 kV power grid side; after being connected with a positive pole of the direct current voltage stabilization capacitor group (2), a positive pole on a direct current side is connected with a direct current side of the second MMC module (3); after being connected with a negative pole of the direct current voltage stabilization capacitor group (2), a negative pole one a direct current side of the first MMC module is connected with a negative pole on a direct current side of the second MMC module (3), and an alternating current side of the second MMC module (3) is connected with an electrified railway traction station The electric energy quality optimization current transformer can be used for alleviating problems of three phase imbalance and harmonic waves caused by electrified railways. The electric energy quality optimization current transformer is simple in structure, low in cost and high in reliability and is easy to realize.
Description
Technical field
The present invention relates to one kind is applied to AC transmission system, especially electrified railway power supply current transformer and technology.
Background technology
With the continuous growth of high speed passenger transportation and heavy haul railway, electric railway constantly increases to the demand of electric energy.Electrically
Change the transmission of railway electric locomotive electric energy and be all single-phase transmission, so bringing substantial amounts of out-of-balance current, meanwhile, at this stage still
There is substantial amounts of continuous current locomotive, provide power by thyristor rectifier for locomotive, electrical network introduces substantial amounts of harmonic wave electricity
Stream, the harm that this brings to power system can increase further, particularly to the stable impact of electromotor and bus increasingly
Greatly.
Now, main out-of-balance current solution is by changing transformator connected mode, Yi Ji in Traction Station
Traction Station introduces current transformer.
From the angle of electrical network, electrical network is simultaneously not provided with degree of unbalancedness expenses standard, is just difficult to it is carried out from the angle of user
Necessary process.Three-phase load unbalance can cause unfavorable and infringement to public power facility, and it seriously threatens the safety of electrical network
Run in addition to the harm such as possible protective relaying maloperation work, big load phase equipment overload, will also cause the tight of Line Loss of Distribution Network System
Increase, electric wire generates heat, and situation about burning even again.
The traditional out-of-balance current processing method of grid side is to be born by introducing unbalanced reactance or electric capacity on electrical network
Carry, this scheme can solve stable out-of-balance current；And electric railway to the out-of-balance current that grid side is brought be with
Machine, and current value is larger.Therefore traditional method is restricted.
Modular multi-level converter (modular multilevel converter, mmc) utilizes substantial amounts of submodule
It is connected in series, submodule is relatively simple, be easily controlled it is possible to continue cascade extension, thus bringing, loss is little, harmonic wave is few, opens
Close frequency low, the advantages of high pressure, a kind of current transformer more applicable in mesohigh occasion.
Content of the invention
Harmonic content for electric railway grid side and the larger problem of unbalanced power degree, the purpose of the present invention exists
In providing a kind of grid side to unify electric energy quality optimizing current transformer, this device can reduce the harmonic content of grid side, for electric
Changing railway provides unbalanced power, and this device adopts mmc module to realize, to increase the capacity of current transformer.
A kind of electric railroad grid side electric energy quality optimizing current transformer of modular multilevel, described electric energy quality optimizing becomes
Stream device be made up of a mmc module, the 2nd mmc module and DC voltage-stabilizing capacitor bank, a described mmc module AC with
220kv or 110kv grid side is connected, after the positive pole of DC side is connected with the positive pole of DC voltage-stabilizing capacitor bank, connection described the
The DC side of two mmc modules, after the negative pole of a described mmc module DC side is connected with the negative pole of DC voltage-stabilizing capacitor bank,
Connect the negative pole of the DC side of described 2nd mmc module, described 2nd mmc module exchange is surveyed and connected to electric railway traction
Stand.
In case study on implementation, when electric locomotive needs electric energy, a described mmc module is being operated in three-phase symmetrical
Rectification state, described 2nd mmc module, according to out of phase power demand, is operated in non-symmetrical inverse state.
In case study on implementation, when electric locomotive regenerative braking, a described mmc module is being operated in three-phase symmetrical inversion
State, described 2nd mmc module, according to out of phase Feedback of Power, is operated in asymmetric rectification state.
In case study on implementation, the power supply system of described three-phase high-voltage public electric wire net is 110kv/50hz or 220kv/
50hz；The power supply system at described electric railway traction station is 110kv/50hz or 220kv/50hz.
The beneficial effects of the present invention is:
Connect Traction Station and public substation bus bar circuit on, the electric railroad electrical network of the many level of connection mode massing
Side electric energy quality optimizing current transformer, when Traction Station has electric railway to pass through, public electric wire net electric energy is passed through not by this current transformer
Symmetrical unsteady flow is powered to the biphase current needed for Traction Station, and meanwhile, the harmonic wave that electric railway is produced filters.When electric
When changing railway regenerative braking, the symmetrical inversion of the asymmetric electric energy that electric locomotive is produced by this current transformer is in electrical network.From
And unified electric energy quality optimizing effect can be realized.
Present configuration is simple, be easily achieved, low cost, reliability are high.
Brief description
Fig. 1 is the electric railroad grid side electric energy quality optimizing current transformer operation principle schematic diagram of modular multilevel；
Fig. 2 is the electric railroad grid side electric energy quality optimizing current transformer public electric wire net side structure figure of modular multilevel；
Fig. 3 is the electric railroad grid side electric energy quality optimizing current transformer Traction Station side structure figure of modular multilevel；
Fig. 4 is modular multilevel circulator submodule principle schematic；
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.
As shown in figure 1, a kind of electric railroad grid side electric energy quality optimizing current transformer of modular multilevel, described unification
Electric energy quality optimizing current transformer is made up of a mmc module 1, the 2nd mmc module 3 and DC voltage-stabilizing capacitor bank 2, and described first
Mmc module 1 AC is connected with three-phase high-voltage public electric wire net, the positive pole phase of the positive pole of DC side and DC voltage-stabilizing capacitor bank 2
Lian Hou, connects the DC side of described 2nd mmc module 3, the negative pole of a described mmc module 1 DC side and DC voltage-stabilizing electric capacity
After the negative pole of device group 2 is connected, connect the negative pole of the DC side of described 2nd mmc module 3, described 2nd mmc module 3 exchange is surveyed even
It is connected to electric railway traction station.
As shown in Fig. 2 common electrical net side three-phase electricity passes through three groups of modular multi-level converter mmc modules and DC side phase
Even, be wherein often connected one group of mmc module, and every group of mmc module includes two brachium pontis, each brachium pontis by n sm submodule sm1,
Sm2 ... smn is composed in series, and is then linked in each phase of electrical network by inductance series connection. the structure chart of submodule sm such as Fig. 4
Shown, determined according to practical application voltage level in every submodule sm number n mutually selected.
As shown in figure 3, Traction Station side three-phase electricity passes through three groups of modular multi-level converter mmc modules and DC side phase
Even, be wherein often connected one group of mmc module, and every group of mmc module includes two brachium pontis, each brachium pontis by n sm submodule sm1,
Sm2 ... smn is composed in series, and is then linked in each phase of electrical network by inductance series connection. the structure chart of submodule sm such as Fig. 4
Shown, determined according to practical application voltage level in every submodule sm number n mutually selected.
When electric locomotive needs electric energy, by controlling the on off state of mmc each submodule of current transformer, make first
Mmc module 1 is being operated in three-phase symmetrical rectification state, is that DC voltage-stabilizing capacitor bank 2 is powered, described 2nd mmc module 3 basis
Out of phase power demand, is operated in non-symmetrical inverse state, and the electric energy that DC voltage-stabilizing capacitor bank 2 is stored is supplied to traction
Stand.
During electric locomotive regenerative braking, described 2nd mmc module 3, according to out of phase Feedback of Power, is operated in asymmetric
Rectification state, the electric energy of feedback is supplied to DC voltage-stabilizing capacitor bank 2.Described 1 DC voltage-stabilizing capacitor of a mmc module
The energy of group 2 storage is provided in public electric wire net by three-phase symmetrical inversion.
In China, it is that the voltage form of power supply for locomotive station is 110kv/50hz or 220kv/50hz, therefore described three-phase
The power supply system of high pressure public electric wire net is 110kv/50hz or 220kv/50hz, the power supply system at described electric railway traction station
Formula is 110kv/50hz or 220kv/50hz.
Claims (5)
1. the present invention relates to a kind of electric railroad grid side electric energy quality optimizing current transformer of modular multilevel, described electricity
Can quality optimization current transformer be made up of a mmc module (1), the 2nd mmc module (3) and DC voltage-stabilizing capacitor bank (2), described
First mmc module (1) AC is connected with three-phase high-voltage public electric wire net, the positive pole of DC side and DC voltage-stabilizing capacitor bank (2)
Positive pole be connected after, connect described 2nd mmc module (3) DC side, the negative pole of described mmc module (1) DC side with
After the negative pole of DC voltage-stabilizing capacitor bank (2) is connected, the negative pole of the DC side of the described 2nd mmc module (3) of connection, described second
Mmc module (3) exchange is surveyed and is connected to electric railway traction station.
2. the electric railroad grid side electric energy quality optimizing current transformer of modular multilevel according to claim 1, it is special
Levy and be: when electric locomotive needs electric energy, a described mmc module (1) is being operated in three-phase symmetrical rectification state, described
2nd mmc module (3), according to out of phase power demand, is operated in non-symmetrical inverse state.
3. the electric railroad grid side electric energy quality optimizing current transformer of modular multilevel according to claim 1, it is special
Levy and be: during electric locomotive regenerative braking, a described mmc module (1) is being operated in three-phase symmetrical inverter mode, described second
Mmc module (3), according to out of phase Feedback of Power, is operated in asymmetric rectification state.
4. the electric railroad grid side electric energy quality optimizing current transformer of modular multilevel according to claim 1, it is special
Levy and be: the power supply system of described three-phase high-voltage public electric wire net is 110kv/50hz or 220kv/50hz.
5. the electric railroad grid side electric energy quality optimizing current transformer of modular multilevel according to claim 1, it is special
Levy and be: the power supply system at described electric railway traction station is 110kv/50hz or 220kv/50hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611001639.7A CN106374495A (en) | 2016-11-14 | 2016-11-14 | Modular multilevel electrical railway power grid side electric energy quality optimization current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611001639.7A CN106374495A (en) | 2016-11-14 | 2016-11-14 | Modular multilevel electrical railway power grid side electric energy quality optimization current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106374495A true CN106374495A (en) | 2017-02-01 |
Family
ID=57894222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611001639.7A Pending CN106374495A (en) | 2016-11-14 | 2016-11-14 | Modular multilevel electrical railway power grid side electric energy quality optimization current transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN106374495A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400715A (en) * | 2018-02-07 | 2018-08-14 | 西南交通大学 | Rail traction power supply using modular multi-level converter and train transmission system |
| CN110021948A (en) * | 2019-03-27 | 2019-07-16 | 武汉大学深圳研究院 | Multifunctional high speed railway regenerating braking energy recycling system based on MMC |
-
2016
- 2016-11-14 CN CN201611001639.7A patent/CN106374495A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400715A (en) * | 2018-02-07 | 2018-08-14 | 西南交通大学 | Rail traction power supply using modular multi-level converter and train transmission system |
| CN110021948A (en) * | 2019-03-27 | 2019-07-16 | 武汉大学深圳研究院 | Multifunctional high speed railway regenerating braking energy recycling system based on MMC |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170201 |
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| WD01 | Invention patent application deemed withdrawn after publication |