CN203951195U - A kind of three brachium pontis collocation structures of and asymmetry compensation idle for electric railway - Google Patents
A kind of three brachium pontis collocation structures of and asymmetry compensation idle for electric railway Download PDFInfo
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- CN203951195U CN203951195U CN201320666163.4U CN201320666163U CN203951195U CN 203951195 U CN203951195 U CN 203951195U CN 201320666163 U CN201320666163 U CN 201320666163U CN 203951195 U CN203951195 U CN 203951195U
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- brachium pontis
- electric railway
- phase
- transformer
- inverter
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model relates to a kind of power electronics compensation arrangement for electric railway, belongs to electrified railway power supply field.A collocation structure for and asymmetry compensation idle for electric railway, is characterized in that comprising: the inverter leg of (1) three general DC busbar; The interchange outlet of (2) three inverter legs is received in fed electric railway by connecting reactance or connection transformer, wherein the interchange outlet of the first brachium pontis is connected in the leading phase of drawing electric network, the interchange outlet of the second brachium pontis is connected in the hysteresis of drawing electric network and goes up mutually, and the interchange outlet of the 3rd brachium pontis is connected on the return wire of drawing electric network.The utility model adopts the dynamic compensation structure of three brachium pontis, has public DC bus, can export multiple offset current, except reactive current, also can directly export negative-sequence current and harmonic current.
Description
Technical field
The utility model relates to a kind of power electronics compensation arrangement for electric railway, can be used for the idle and asymmetry compensation of electric railway load, can administer low-order harmonic simultaneously, belong to electrifing railway supply field, relate in particular to a kind of three brachium pontis collocation structures of and asymmetry compensation idle for electric railway.
Background technology
Along with the fast development of national economy, electric railway has obtained develop rapidly, having brought quick, the while of traffic efficiently, has also brought serious power quality problem.Locomotive is single phase power supply load, electric railway traction transformer station also just adopts three-phase-two phase transformer more, comprise VV transformer, VX transformer, Ynd11 transformer, SCOTT transformer etc., its former limit is three-phase 110kV/220kV system, and secondary is two single-phase 27.5kV systems.The former secondary voltage of different traction transformers is different with current relationship, slightly have any different, but the power quality problem causing is similar in influence degree.First, electric locomotive traction load is the very large single-phase load of fluctuation, in the time that the operating mode of locomotive changes, can cause larger load current fluctuation, thereby causes the fluctuation of power supply network voltage; Secondly, electric iron power supply adopts single-phase standard, can produce a large amount of negative-sequence currents; In addition, the locomotive of traditional phase control rectifier formula (as Shaoshan 6 types) can produce very large harmonic current.Electrified railway traction load also can be referring to the relevant portion in document on the impact of electrical network.These,, as do not administered in time in electric railway traction transformer station, will inject electric power system, affect the safe operation of electrical network and involve other users.
The power quality problem existing for traction load, current main governing measure is to install fixed capacitor or TCR additional in 27.5kV side, this kind of mode adopts thyristor series capacitor and inductance to realize compensation, the shortcomings such as it exists, and floor space is large, loss large (especially in the time of underloading); Patent " for the compensation arrangement of electric railway reactive power compensation and quality of power supply control " (application number is 200610089396.7) has proposed a kind of advanced person's compensation way, adopt two four brachium pontis dynamic compensation schemes that connect back-to-back, two single-phase H bridge is connected on respectively two supply arms, can compensate respectively the reactive power of brachium pontis separately, can carry out the meritorious exchange between brachium pontis by public DC bus simultaneously, can direct compensation negative phase-sequence.But because two supply arms have a common line, so in two single-phase bridges, have at least needs to access electrical network by single-phase transformer.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of collocation structure of and asymmetry compensation idle for electric railway, solve in present collocation structure and in two single-phase bridges, have at least needs to load single-phase transformer access electrical network, increase the defect of cost.
Technical scheme
A collocation structure for and asymmetry compensation idle for electric railway, is characterized in that comprising:
The inverter leg of (1) three general DC busbar; The interchange outlet of (2) three inverter legs is received in fed electric railway by connecting reactance or connection transformer, wherein the interchange outlet of the first brachium pontis is connected in the leading phase of drawing electric network, the interchange outlet of the second brachium pontis is connected in the hysteresis of drawing electric network and goes up mutually, and the interchange outlet of the 3rd brachium pontis is connected on the return wire of drawing electric network.
Described three inverter legs are by comprising the also net unit access drawing electric network of linked reactor or transformer.
Described three inverter legs are any one in two level, three level or many level structure, modular multilevel transformer configuration.
Described three inverter legs, adopt a three-phase brachium pontis, or adopt the parallel connection of multiple three-phase brachium pontis.
Described inverter leg adopts the voltage source inverter of gate level turn-off thyristor, igbt, integral gate change transistor or electron injection enhancement gate transistor composition full-control type.
The rated capacity of described three inverter legs is determined according to the connection type of traction transformer.
For the transformer of VV, YND11, VX connection type, leading phase and hysteresis phase phase difference are 60 degree, and the rated capacity of three inverter legs is identical.
For the transformer of SCOTT, balanced impedance matching transformer connection type, leading phase and hysteresis phase phase difference are 90 degree, and the first brachium pontis is identical with the rated capacity of the second brachium pontis, and the rated capacity minimum of the 3rd brachium pontis is 1.414 times of the first brachium pontis.
Beneficial effect
The utility model adopts the collocation structure of three brachium pontis, there is public DC bus, can export multiple offset current, except reactive current, also can directly export negative-sequence current and harmonic current, thereby there is higher cost performance, and can be adapted to various traction transformers, directly be connected on supply arm by reactor or transformer, apply more flexible.
Brief description of the drawings
Fig. 1 is structural principle schematic diagram of the present utility model.
Fig. 2 is 1 liang of level structural representation of circuit implementation of the present utility model.
Fig. 3 is circuit implementation 2 three level structural representations of the present utility model.
Fig. 4 is circuit implementation 3 modular multilevel MMC structural representations of the present utility model.
Embodiment
Below in conjunction with specific embodiment, further set forth the utility model.
The utility model is for prior art above shortcomings, a kind of new technical scheme is proposed on patent mentioned above basis, the dynamic compensating device of three bridge arm structures is connected on to the drawing electric network side of 27.5kV, be applied to the idle and negative sequence compensation of electric iron system, compare the few brachium pontis of four bridge arm structures of above-mentioned patent.Three brachium pontis have public DC bus, can export multiple offset current, except reactive current, also can directly export negative-sequence current and harmonic current, thereby have higher cost performance.This scheme can be adapted to various traction transformers, is connected on supply arm by reactor or transformer, applies more flexible.
Apparatus structure principle of the present utility model, with reference to accompanying drawing 1, comprising:
(1) adopt the brachium pontis of three general DC busbars to form, the interchange outlet of three brachium pontis is received in drawing electric network by connecting reactance or connection transformer, the interchange outlet of brachium pontis 1 is connected in traction net leading phase, the interchange outlet of brachium pontis 2 is connected in the hysteresis of traction net and goes up mutually, and the interchange outlet of brachium pontis 3 is connected on traction net return wire.
(2) parameter of brachium pontis is determined according to the connection type of traction transformer, and for different traction transformers, the rated current of three brachium pontis may be different.
The three brachium pontis compensation arrangements for electric railway that the utility model proposes are applied the three-phase voltage source type inverter based on full-control type power electronic switch, have the following advantages:
(1) Scheme of Reactive Power Compensation of employing SVC, though also can realize dynamic compensation, can produce a large amount of harmonic currents, and therefore compensation arrangement itself must add certain filter, and single unit system is bigger than normal; And the running wastage of reactor is very big.And device of the present utility model adopts pulse-width modulation (PWM) technology or multiple inverter configuration, can make its output current approach sinusoidal wave, thereby without the filter outside plus;
(2) by the switch control to device for high-power power electronic, device of the present utility model not only can be realized idle continuous adjusting (absorb or send idle), and by the shared DC bus of three brachium pontis, can directly carry out alternate meritorious transmission, thereby the negative phase-sequence that two supply arm loads are produced compensates;
(3), except idle and negative sequence compensation, can carry out the dynamic compensation of harmonic wave simultaneously;
(4) compare four brachium pontis compensation schemes of the formula back-to-back that patent carries, the few brachium pontis quantity of the utility model, and can directly not access electric iron system by transformer;
(5) in supply arm underloading situation, the pulse that the utility model device can locking inverter, thus greatly reduce the running wastage of device;
(6) be applicable to various electric railway traction transformers, simultaneously according to the feature of different traction transformers, the capacity of each brachium pontis can design respectively, to improve the utilance of device.
In above-mentioned collocation structure, forming three brachium pontis of structure, can be any one in two level, three level or many level structure, many level of module MMC structure, as shown in accompanying drawing 2～4.Can be a three-phase bridge arm assembly, also can adopt as required the parallel connection of multiple three-phase brachium pontis.
In collocation structure of the present utility model, in the time not needing to export offset current, inverter can be operated in pulse blocking, to reduce the running wastage of whole device.If adopt the structure of multiple inverter parallels, when output current hour, the lockable part phase inverter that fall apart, makes full use of the capacity of single module, thereby reduces device loss, the operational efficiency of raising device.
Below further introduce the principle of the utility model collocation structure:
The utility model provides a kind of three bridge arm structures, is applied to the idle and negative sequence compensation of electric iron system.It is a kind of parallel connection type collocation structure forming based on voltage source inverter (VSC), it adopts the high-power power electronic device of turn-offing such as gate level turn-off thyristor (GTO), igbt (IGBT), integral gate change transistor (IGCT) or electron injection enhancement gate transistor (IEGT), the VSC of composition full-control type, can realize conversion and the utilization of electric energy easily.Structure of the present utility model comprises: the brachium pontis of (1) three general DC busbar; (2) by the also net unit of three brachium pontis access drawing electric networks, comprise linked reactor or transformer.
For the electric railway quality problems such as the voltage fluctuation that the negative phase-sequence, harmonic wave and the impact load that cause cause of loading, can utilize the feature of three brachium pontis, bring into play the effect of its public direct-flow bus wire, better meet improvement demand.The wiring of the collocation structure principle that the utility model is carried is with reference to shown in figure 1, applicable to the asymmetry compensation of the Traction Substation of Electric Railway of all kinds wiring.
Shown in Fig. 1, the collocation structure the utility model proposes is connected on 27.5kV supply arm side, apply structure of the present utility model, acquisition system can be increased on this architecture basics gather respectively the electric current of two supply arms, according to the relation of the former secondary current of traction transformer, draw corresponding former limit three-phase current; Simultaneously according to former secondary relation, derive the relation with negative phase-sequence idle with former limit three-phase system of energy transmission between secondary two supply arms.Acquisition system can be compensated after reference component after electric current is carried out to analytical calculation, utilize energy transfer principle between two supply arms to obtain the compensate for reference electric current of secondary two supply arms, reference current using two reference current sum negates as common line, can draw compensate for reference electric current simultaneously.
Claims (8)
1. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway, is characterized in that comprising: the inverter leg of (1) three general DC busbar; The interchange outlet of (2) three inverter legs is received in fed electric railway by connecting reactance or connection transformer, wherein the interchange outlet of the first brachium pontis is connected in the leading phase of drawing electric network, the interchange outlet of the second brachium pontis is connected in the hysteresis of drawing electric network and goes up mutually, and the interchange outlet of the 3rd brachium pontis is connected on the return wire of drawing electric network.
2. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 1, is characterized in that: described three inverter legs by comprise linked reactor or transformer and net unit access drawing electric network.
3. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 1, it is characterized in that: described three inverter legs are any one in two level, three level or many level structure, modular multilevel transformer configuration.
4. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 1, is characterized in that: described three inverter legs, adopt a three-phase brachium pontis, or adopt the parallel connection of multiple three-phase brachium pontis.
5. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 1, is characterized in that: described inverter leg adopts the voltage source inverter of gate level turn-off thyristor, igbt, integral gate change transistor or electron injection enhancement gate transistor composition full-control type.
6. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 1, is characterized in that: the rated capacity of described three inverter legs is determined according to the connection type of traction transformer.
7. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 6, it is characterized in that: for the transformer of VV, YND11, VX connection type, leading phase and hysteresis phase phase difference are 60 degree, and the rated capacity of three inverter legs is identical.
8. three brachium pontis collocation structures of and asymmetry compensation idle for electric railway as claimed in claim 6, it is characterized in that: for the transformer of SCOTT, balanced impedance matching transformer connection type, leading phase and hysteresis phase phase difference are 90 degree, the first brachium pontis is identical with the rated capacity of the second brachium pontis, and the rated capacity minimum of the 3rd brachium pontis is 1.414 times of the first brachium pontis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666163.4U CN203951195U (en) | 2013-10-25 | 2013-10-25 | A kind of three brachium pontis collocation structures of and asymmetry compensation idle for electric railway |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320666163.4U CN203951195U (en) | 2013-10-25 | 2013-10-25 | A kind of three brachium pontis collocation structures of and asymmetry compensation idle for electric railway |
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| CN203951195U true CN203951195U (en) | 2014-11-19 |
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| CN201320666163.4U Expired - Fee Related CN203951195U (en) | 2013-10-25 | 2013-10-25 | A kind of three brachium pontis collocation structures of and asymmetry compensation idle for electric railway |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969608A (en) * | 2020-06-28 | 2020-11-20 | 中铁第一勘察设计院集团有限公司 | Power flow control system of Vx traction substation of electrified railway |
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2013
- 2013-10-25 CN CN201320666163.4U patent/CN203951195U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969608A (en) * | 2020-06-28 | 2020-11-20 | 中铁第一勘察设计院集团有限公司 | Power flow control system of Vx traction substation of electrified railway |
| CN111969608B (en) * | 2020-06-28 | 2022-03-22 | 中铁第一勘察设计院集团有限公司 | Power flow control system of Vx traction substation of electrified railway |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20201025 |
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| CF01 | Termination of patent right due to non-payment of annual fee |