CN209159471U - Negative sequence management system for electric railway traction power supply system AT power supply mode - Google Patents
Negative sequence management system for electric railway traction power supply system AT power supply mode Download PDFInfo
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- CN209159471U CN209159471U CN201821740239.2U CN201821740239U CN209159471U CN 209159471 U CN209159471 U CN 209159471U CN 201821740239 U CN201821740239 U CN 201821740239U CN 209159471 U CN209159471 U CN 209159471U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
A kind of negative sequence management system for electric railway traction power supply system AT power supply mode solves the problems, such as AT power supply mode negative phase-sequence with cost-effective, and optimization traction web frame realizes the through power supply in traction substation end.The traction substation powered including supply arm to the left and right side supply arm, the traction substation setting balance traction transformer and the straight alternating flow device of friendship, high pressure incoming power is transformed to the two-phase electricity that voltage rating is 27.5kV, 90 ° of phase angle difference through balance traction transformer, wherein a phase is as the T-phase power supply of AT power supply mode for contact net, another phase is by handing over straight alternating flow device, output differs 180 ° of voltages with T-phase phase angle, and the F phase power supply as AT power supply mode is for positive feeder；The balance traction transformer neutral point is connected with broad sense ground wire.
Description
Technical field
The utility model relates to electric railway traction power supply systems, in particular to a kind of to be applied to electric railway traction
The negative sequence management system of power supply system auto-transformer (hereinafter referred to as AT) power supply mode.
Background technique
Electric propulsion due to being answered in the railway of countries in the world with the advantages such as high efficiency, low energy consumption, pollution-free extensively
With China's electric railway exchanges 25kV power supply system using single phase industrial frequence (50Hz).Traction networks are led using single phase power supply mode
Power supply system three-phase load unbalance is caused, generating influences the negative phase-sequence of electric system；Electric locomotive is using exchange flexible power supply skill
Art leads to power supply system electric current, voltage waveform distortion, and generating influences the harmonic wave of electric system；Conventional electric power locomotive is using straight
Traction electric machine technology is flowed, causes power supply system power factor low, generates reactive power problem；Further, since traction load is with line
The road gradient, Transportation Organization, train operation operating condition etc. are different and change, and cause power system voltage fluctuation more violent.With electricity
The development of power locomotive technology, AC transmission electric power locomotive and motor-car obtain large-scale promotion use, electric railway power factor
Problem is substantially resolved；Harmonic problem at present largely use AC transmission electric power locomotive and motor-car in the case where, compared with
Toward also having significant change, traditional 3 times, 5 times, the 7 inferior lower harmonic waves of number, containing ratio declines to a great extent, but number is higher
Harmonic wave, containing ratio increased, this is mainly AC Drive using PWM (pulse modulation technology), IGBT (insulated gate bipolar
Transistor npn npn, triggering frequency reach 2000Hz~4000Hz) bring variation, constantly enhance in network system, high-speed rail and heavy duty
Railway largely uses under the 220kV even overall background of 330kV power supply, and harmonic problem has also obtained a degree of solution.
Negative phase-sequence problem is caused just gradually to be asked as electrified railway electric energy quality due to the particularity of traction load negative phase-sequence problem
The key of topic.
China railways tractive power supply system is used with phase single side feeding mode, and single supply arm traction load is in electric system
Middle generation negative phase-sequence, its size and the supply arm traction load sizableness.In order to solve the problems, such as negative phase-sequence, common measure is to use
The non-single-phase traction transformer such as balance traction transformer, balance traction transformer low-pressure side export two-phase voltage, the two-phase voltage
Phase angle differs 90 °, when low-pressure side two-phase traction load is in identical traction or regeneration regime, and it is equal in magnitude when, can be complete
It is complete to offset related negative phase-sequence influence；Other non-single-phase traction transformers low-pressure side two-phase traction load be in it is identical traction or again
When raw operating condition, the influence of part negative phase-sequence can also be offset, such as Vv or Ynd11 Connection Traction Transformer, when two sides traction load size
When equal, the influence of 50% negative phase-sequence can be offset.But for solving the problems, such as the scheme of negative phase-sequence using non-single-phase traction transformer,
There is also due to traction load fluctuate it is larger, tractive transformer low-pressure side difference phase supply load often differs greatly, and passes through two
Phase load carry out negative phase-sequence influence offset effect substantially reduce, even without effect the problem of.Further, it is contemplated that a phase load is to lead
Draw or regenerate, another phase load be regeneration or traction, i.e., when two-phase load condition is just the opposite, then two phase loads generate negative phase-sequence
It can not only offset, and superposition is amplified.
AT power supply mode has that power delivering capability is strong, power supply distance is remote, rail potential can be effectively reduced and to leading to along the line
The interference for interrogating route adapts to the features such as high-power load power supply needs, thus in China's high speed and heavily loaded electric railway
To being more and more widely used.For AT power supply mode, supply voltage is 55kV on Traction networks, and traction load passes through specified electricity
Pressure is 27.5kV, output voltage phase angle differs 180 ° of " T " phase voltage and " F " phase voltage is powered.
With the development of power electronic devices and control technology, flexible AC power supply technique obtains increasingly extensive application,
Using the adjustable voltage of flexible AC power supply technique or electric current output phase, amplitude, and then control system trend, improve electric energy
Quality.For AT power supply mode, using balance traction transformer, high-pressure side introduces three phase mains, low-pressure side export two-phase voltage,
Voltage rating is 27.5kV, and phase angle differs 90 °；Then flexible AC power supply technique is utilized, two-phase voltage phase angle will be exported
Difference is adjusted to 180 °, and " T " phase voltage needed for forming AT power supply mode and " F " phase voltage are for traction load；In this way, traction is negative
Lotus is broken down into T-phase component and F phase component, and traction load influences to be equal to T-phase component and F phase point in the negative phase-sequence that high-pressure side is formed
The difference of amount.It is more traditional to be based on two due to T-phase component and F phase component that program negative sequence compensation is decomposed based on traction load itself
Phase different load carries out negative sequence compensation scheme, on the one hand avoids compensation effect caused by two-phase traction load difference and is difficult to reach
It is expected that problem, on the other hand also solve two-phase traction load operating condition it is different caused by negative phase-sequence superposition scale-up problem, meanwhile, lead
Draw net system to be only made of T-phase component and F phase component, the electric split-phase of traditional approach institute end setting can be cancelled, advanced optimized
Traction web frame, realizes the through power supply in traction substation end.
Utility model content
The technical problem to be solved by the utility model is to provide one kind to supply for electric railway traction power supply system AT
The negative sequence management system of electric mode solves the problems, such as AT power supply mode negative phase-sequence with cost-effective, and web frame is drawn in optimization, and realization is led
Draw the through power supply in electric substation end.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
The utility model is used for the negative sequence management system of electric railway traction power supply system AT power supply mode, including to the left
The traction substation of side supply arm and the power supply of right side supply arm, it is characterized in that: balance traction transformation is arranged in the traction substation
Device and the straight alternating flow device of friendship, it is 27.5kV, phase that high pressure incoming power, which is transformed to voltage rating through balance traction transformer,
Angle differs 90 ° of two-phase electricity, wherein a phase as AT power supply mode T-phase power supply for contact net, another phase is by the straight alternation of friendship
Device is flowed, output differs 180 ° of voltages with T-phase phase angle, and the F phase power supply as AT power supply mode is for positive feeder；The balance traction
Transformer neutral point is connected with broad sense ground wire.
The utility model has the beneficial effects that the T-phase point decomposed based on traction load itself due to the system negative sequence compensation
Amount and F phase component are carried out compared with negative sequence compensation method based on two-phase different load with tradition, on the one hand avoid two-phase traction
Compensation effect caused by load difference is difficult to reach expected problem, and it is different on the other hand also to solve two-phase traction load operating condition
Caused negative phase-sequence is superimposed scale-up problem；The tractive transformer that this method uses for the tractive transformer applied to direct-furnish mode, and
Without conventional AT power supply mode tractive transformer, the two compares, the former is double-winding structure, low-pressure side output voltage
For 27.5kV, the latter is three winding structure, and low-pressure side output voltage is 2 × 27.5kV, and therefore, former structure is simple, price compared with
It is low, there is better economy；Traction networks system is only made of T-phase component and F phase component, can be cancelled traditional approach institute end and be set
The electric split-phase set, has advanced optimized traction web frame, realizes the through power supply in traction substation end.
Detailed description of the invention
This specification includes following two width attached drawing:
Fig. 1 is knot of the utility model for the negative sequence management system of electric railway traction power supply system AT power supply mode
Structure schematic diagram.
Fig. 2 is the utility model in the negative sequence management system of electric railway traction power supply system AT power supply mode
Electric railway traction power supply system unilateral side supply arm AT power supply mode schematic diagram.
Component and corresponding label in figure: traction substation 10, balance traction transformer 12, is handed over high pressure incoming power 11
Straight alternating flow device 13, left side supply arm 20, right side supply arm 21, contact net 22, broad sense ground wire 23, positive feeder 24, AT institute 30,
First AT section 31, the 2nd AT section 32, the 3rd AT section 33, auto-transformer 34, traction load 35.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to Fig.1, the utility model is used for the negative sequence management system of electric railway traction power supply system AT power supply mode,
Including the traction substation 10 that supply arm 20 to the left and right side supply arm 21 are powered, it is characterized in that: the traction substation 10
Balance traction transformer 12 is set and hands over straight alternating flow device 13, high pressure incoming power 11 is transformed to through balance traction transformer 12
Voltage rating is the two-phase electricity of 27.5kV, 90 ° of phase angle difference, wherein a phase supplies to connect as the T-phase power supply of AT power supply mode
Net-fault 22, for another phase by handing over straight alternating flow device 13, output differs 180 ° of voltages, the F as AT power supply mode with T-phase phase angle
Phase power supply is for positive feeder 14；12 neutral point of balance traction transformer is connected with broad sense ground wire 23.
By obtaining T-phase component and F phase component to traction load itself decomposition, avoiding two-phase traction load difference causes
Compensation effect be difficult to reach expected problem, while also solve two-phase traction load operating condition it is different caused by negative phase-sequence superposition put
Big problem.Using direct-furnish mode balancing transformer, structure is simple, and price is lower, and low-pressure side output voltage is 27.5kV, economical
Property is more preferable.(AC/DC/AC) converter plant is directly handed in the friendship of use, has relatively good isolation effect.
The broad sense ground wire 23 includes the earth, rail, PW protective wire and integrated geophysics.
AT segment number is at least one on the left side supply arm 20 and right side supply arm 21.
It further analyzes in conjunction with Fig. 2 using the negative sequence management effect after this system.Unilateral supply arm (left side supply arm 20 or
Right side supply arm 21) it is constituted by three AT sections, it is provided with balance traction transformer 12 in traction substation 10, hands over straight alternating flow dress
13 and high pressure incoming power 11 are set, traction substation 10 is powered traction load 35 by T-phase power supply and F phase power supply, supplies
Auto-transformer 34 is set in electric arm.The first AT section 31 is constituted between traction substation 10 and nearest auto-transformer 34, by
It is proximal and distal, the 2nd AT section 32, the 3rd AT section 33 are constituted between adjacent auto-transformer 34.
According to the regulation of GB/T 15543 " power quality imbalance of three-phase voltage ", electric system points of common connection voltage is not
Degree of balance limit value is that, when power grid operates normally, negative sequence voltage degree of unbalancedness is no more than 2%, is no more than 4% in short-term and (refers in short-term
3s~1min)；This negative sequence voltage degree of unbalancedness permissible value is caused to be generally 1.3% each user of points of common connection,
It is no more than 2.6% in short-term.
AT power supply mode usual supply arm in China's is constituted by 2 AT sections, according to AT power supply mode simplified model, it is assumed that traction
Load is " 1 ", when traction load 35 is located remotely from the 2nd AT section 32 of traction substation 10,10 end T-phase of traction substation
Component and F phase component electric current are equal, at this point, use this system then traction substation 10 high-pressure side generate negative sequence component for
The difference of T-phase component and F phase component is zero；When traction load 35 is located in the first AT section 31 of traction substation 10, lead
Draw load 35 in the value of 10 end T-phase component of traction substation and F phase component, as different location constantly becomes load in AT sections
Change, when load by AT sections of ends gradually close to traction substation 10, this process is about T-phase component and changes to 1, F phase by 0.5
Component by 0.5 change to 0 process, 10 end T-phase component of traction substation and F phase component current average are 0.75 and 0.25,
At this point, use this system then in the negative sequence component of the high-pressure side of traction substation 10 generation for the difference of T-phase component and F phase component,
It is 0.5, situation in comprehensive first AT section 31, the 2nd AT section 32, then the negative sequence component generated in the high-pressure side of traction substation 10
It is 0.25, China express railway or the single traction load power of heavy haul railway are up to 25MVA or so, consider single traction power transformation
8 traction loads are supplied, meets GB/T 15543 and " this negative sequence voltage imbalance is caused for each user of points of common connection
Degree permissible value is generally 1.3% " extreme condition, then becomes at points of common connection, i.e. for the 220kV of traction substation or 330kV
At the bus of power station, capacity of short circuit need to be greater than 3846MVA, and system is minimum at China's major part 220kV or 330kV substation bus bar
Capacity of short circuit is all larger than 4000MVA or so, therefore the system can satisfy the most of tractive power supply system negative sequence compensations in China
It needs.In addition, as needed further to increase negative sequence compensation effect then AT can be increased by adding AT institute 30 on Traction networks
The quantity of section is realized, such as when AT segment number increases to 3 on supply arm, when traction load 35 is located remotely from traction power transformation
In 10 the 3rd AT section 33 and the 2nd AT section 32 when, 10 end T-phase component of traction substation and F phase component electric current are equal, are leading
The negative sequence component for drawing the high-pressure side generation of electric substation 10 is zero；When traction load 35 is located at the first AT close to traction substation 10
It is then 0.5 in the negative sequence component that the high-pressure side of traction substation 10 generates, situation in three AT sections of synthesis then exists when in section 31
The negative sequence component that the high-pressure side of electric substation 10 generates is 0.167, and the case where composition compared with supply arm by 2 AT sections, negative phase-sequence is further
Reduce 33.2%.
The above only explains through diagrams the utility model for electric railway traction power supply system AT power supply mode
Negative sequence management system some principles, be not intended to for the utility model to be confined to shown in and the specific structure and be applicable in
In range, therefore all corresponding modifications that may be utilized and equivalent, belong to the applied patent of the utility model
Range.
Claims (3)
1. being used for the negative sequence management system of electric railway traction power supply system AT power supply mode, including supply arm (20) to the left
The traction substation (10) powered with right side supply arm (21), it is characterized in that: balance traction is arranged in the traction substation (10)
Transformer (12) He Jiaozhi alternating flow device (13), high pressure incoming power (11) are transformed to voltage through balance traction transformer (12)
Rated value be 27.5kV, phase angle differ 90 ° two-phase electricity, wherein a phase as AT power supply mode T-phase power supply for contact net
(22), for another phase by handing over straight alternating flow device (13), output differs 180 ° of voltages, the F as AT power supply mode with T-phase phase angle
Phase power supply is for positive feeder (14)；Balance traction transformer (12) neutral point is connected with broad sense ground wire (23).
2. it is used for the negative sequence management system of electric railway traction power supply system AT power supply mode as described in claim 1,
Be characterized in: the broad sense ground wire (23) includes the earth, rail, PW protective wire and integrated geophysics.
3. it is used for the negative sequence management system of electric railway traction power supply system AT power supply mode as described in claim 1,
Be characterized in: AT segment number is at least one on the left side supply arm (20) and right side supply arm (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821740239.2U CN209159471U (en) | 2018-10-25 | 2018-10-25 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821740239.2U CN209159471U (en) | 2018-10-25 | 2018-10-25 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
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| Publication Number | Publication Date |
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| CN209159471U true CN209159471U (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821740239.2U Withdrawn - After Issue CN209159471U (en) | 2018-10-25 | 2018-10-25 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109435783A (en) * | 2018-10-25 | 2019-03-08 | 中铁二院工程集团有限责任公司 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
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2018
- 2018-10-25 CN CN201821740239.2U patent/CN209159471U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109435783A (en) * | 2018-10-25 | 2019-03-08 | 中铁二院工程集团有限责任公司 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
| CN109435783B (en) * | 2018-10-25 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Negative sequence management system for AT power supply mode of electrified railway traction power supply system |
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| AV01 | Patent right actively abandoned | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190726 Effective date of abandoning: 20230922 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190726 Effective date of abandoning: 20230922 |