CN103241138B - Low-frequency traction power supply system - Google Patents
Low-frequency traction power supply system Download PDFInfo
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- CN103241138B CN103241138B CN201310143530.7A CN201310143530A CN103241138B CN 103241138 B CN103241138 B CN 103241138B CN 201310143530 A CN201310143530 A CN 201310143530A CN 103241138 B CN103241138 B CN 103241138B
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Abstract
The invention discloses a low-frequency traction power supply system which is composed of traction substations and traction networks. Each traction substation comprises a traction transformer and a transducer, a primary-side three phase of each traction transformer is connected with a public utility grid, a secondary-side three phase of each traction transformer is connected with the corresponding transducer, traction sides output by the transducers is single-phase, and the traction networks are powered through single-phase traction buss. The power supply frequency f of the traction networks meets the following formula: fault removal time limit TS (ms) of the traction network=relay protection action time TR (ms)+half cycle lambda (ms), namely, f=500/(TS-TR), TS)TR and within 5Hz-16Hz, the traction networks of the traction substations can be connected to implement communicated power supply, and during interruption maintenance or traction-side fault of the traction substation, the transducers are switched off and related breakers are switched on. The low-frequency traction power supply system is widely suitable for power supply of metros with one line at one place, light-rail vehicles, tramcars and trolleybuses with two electric traction lines, and convenient to implement.
Description
Technical field
The present invention relates to traffic and transport field, particularly a kind of low frequency traction power supply technology.
Background technology
The structure utilizing single-phase tractive power supply system to have is simple, construction cost is cheap, use and the advantage such as easy to maintenance, main line electrified railway generally adopts the single phase industrial frequence alternating current standard of high voltage (27.5kV), and city underground, light rail and the public transport such as rail, trackless trolley car generally adopt the direct current (DC) standard of low voltage.
Adopt the direct power taking of electrified railway of single phase industrial frequence alternating current standard in utility network, only use cheap, reliable ground voltage transformer, do not use the converter plant that cost is higher, and have tractive output large, the distinguishing feature that freight volume is large, but producing again has dysgenic power quality problem and the electric phase-splitting of self (power supply breakpoint) problem etc. based on negative phase-sequence to utility network, difficulty of governance is large, cost is high, simultaneously, in power frequency (China is 50Hz) power supply, the electric power system loss of voltage caused by reactance is much larger than the loss of voltage caused by resistance, obviously, total loss of voltage is much larger than direct current (DC) standard.
The track traffic such as city underground, light rail generally adopts the direct-current traction power supply of low voltage (750V and 1500V), the voltage of rail and trackless trolley car is lower, it is little that it has power supply voltage to lose, Traction networks between substation can be through to avoid the advantages such as power supply breakpoint, but there is stray current (the earth be confused stream), during fault, direct current arc such as not easily to cut off at the intrinsic problem.Stray current all will produce electrochemical corrosion to the metallic facility such as bar construction and metal pipe line along the line in railway roadbed bar construction, tunnel, thus affect safety and the service life of these structures and metallic facility, to administer and maintenance difficulties is large, cost is high, and fundamentally can not eliminate stray current and long-term corrosion thereof and affect; DC circuit breaker will cut off direct current arc, and technical risk is large, and mechanism is complicated, and service life is short, and cost is high, and China's dependence on import always so far.
Future city public transport is crowded will be more and more severeer with pollution situation, increase transport power, raises the efficiency, decreasing pollution is only the basic method of dealing with problems.For avoiding the drawback that public transport disposable energy resource consumption in traditional cities is large, serious to city pollution, electric traction is adopted to be the most real selection.Therefore, proposing a kind of between single phase industrial frequence alternating current standard and direct current (DC) standard, that can maximize favourable factors and minimize unfavourable ones and the low frequency power supply standard of line frequency can be selected to be very necessary according to self-demand, is also very important.
Low frequency tractive power supply system is widely used in the power supply of city underground, light rail and the urban public transport such as rail, trackless.Simultaneously, because volume of transformer is inversely proportional to frequency, low frequency power supply can make volume of transformer increase, become extremely uneconomical, therefore, should make every effort to avoid using voltage transformer in low frequency tractive power supply system, in other words, the today of the AC Drive Technology being power circuit is widely used with current transformer at mass transportation facilities, the voltage of the low frequency tractive power supply system of powering directly to vehicle can not be too high because considering the factors such as the withstand voltage level of current transformer (frequency converter) and economic performance, generally reach several kilovolts, but along with the growth of traffic transport power demand and the development of Semiconductor Converting Technology and manufacturing technology, may use from now on more high potential to increase power supply capacity further.
Summary of the invention
Object of the present invention is just to provide a kind of low frequency tractive power supply system, namely a kind of between single phase industrial frequence alternating current standard and the direct current (DC) standard, can maximize favourable factors and minimize unfavourable ones to single phase industrial frequence alternating current standard and direct current (DC) standard, and the low frequency power supply standard of line frequency can be selected according to self-demand; Do not re-use DC circuit breaker; Frequency converter can be used as alternating-current switch and coordinates traction substation maintenance and traction side failure removal; Unlike direct current (DC), produce stray current and electrochemical corrosion, also unlike single phase industrial frequence alternating current, produce the power quality problem based on negative phase-sequence at utility network and self there is electric phase-splitting (power supply breakpoint) problem; The Traction networks UNICOM of each traction substation can be implemented through power supply, and greatly reduce the loss of voltage of Traction networks.
The present invention solves its technical matters, and the technical scheme adopted is: a kind of low frequency tractive power supply system, is made up of traction substation SS and Traction networks OCS; Traction substation comprises traction transformer TT and frequency converter UF; The former limit three of traction transformer is connected utility network PS, and secondary limit three is connected frequency converter UF; The traction side that frequency converter UF exports is that low frequency is single-phase and powered to Traction networks OCS and vehicle L by single-phase traction bus BB; In a certain fixed frequency of Traction networks line frequency f between 5Hz and 16Hz; The Traction networks of each traction substation can UNICOM, implements through power supply.
Described single-phase traction bus BB divides left and right two feeder lines, and establishes feeder breaker KL and KR, realizes Traction networks OCS segmentation and train not power-off is passed through, and when traction substation interruption maintenance or traction side fault, turns off its frequency converter.
Consider the factor of the aspects such as cost, reliability, degree of ripeness, the three-level converter based on the IGBT circuit of 1700V or 3300V can large-scale application, and its Traction networks alternating-current voltage/AC voltage is selected to be advisable at about 1200V-2000V.From now on, the Traction networks alternating-current voltage/AC voltage that the similar frequency converter of five level will export can bring up to 4000V.
Principle of work of the present invention is: a kind of low frequency tractive power supply system, is powered by the single-phase low-frequency ac that the three-phase main-frequency convert alternating current of utility network is traction side through traction transformer and frequency converter at traction substation to Traction networks; The Traction networks of each traction substation can UNICOM, implements through power supply; In a certain fixed frequency of Traction networks line frequency f between 5Hz and 16Hz; Traction networks line frequency f meets following formula: Traction networks failure removal time limit TS (ms)=relaying TR opening time (ms)+half cycle λ (ms), i.e. f=500/(TS-TR), TS>TR; When traction substation interruption maintenance or traction side fault, turn off its frequency converter.
Such as, require Traction networks failure removal time limit TS=60ms, relaying TR=20ms opening time, then half cycle=40ms, namely select Traction networks line frequency f=500/40=12.5Hz; To ask Traction networks failure removal time limit TS=60ms, relaying TR=10ms opening time, then half cycle=50ms, namely select Traction networks line frequency f=500/50=10Hz.In other words, half cycle is the Minimum Time Limit l of Traction networks failure removal.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention can overcome direct current arc when direct current (DC) standard exists stray current (the earth be confused stream) and produces electrochemical corrosion, fault to metallic facility along the line and the inherent technology problem such as not easily to cut off, and avoids the great number of stray current control expense and DC circuit breaker to drop into.
Two, the present invention utilizes the former limit three-phase Semiconductor Converting Technology of frequency converter, does not produce negative phase-sequence and exceedes the harmonics and reactive current of Standard at utility network; Utilize the buffer action of frequency converter to utility network and traction side the Traction networks UNICOM of each traction substation, through power supply can be implemented, eliminate electric phase-splitting and the power supply breakpoint thereof of the electrified railway existence of industrial frequency AC; Time normal, low frequency power supply can reduce the loss of voltage of Traction networks greatly, and during fault, the reactance of Traction networks can reduce short circuit current and the impact to power equipment supply thereof.
Three, frequency converter of the present invention can with the circuit breaker of traction side with the use of, for traction substation maintenance and traction side failure removal; The life-span of frequency converter and its switch (conducting and shutoff) number of times have nothing to do, and quick action, the life-span is long, and maintenance cost is low.
Four, Traction networks of the present invention implements through power supply, and regenerated energy during car brakeing can be pulled vehicle and utilizes or return utility network nearby, good energy-conserving effect, environmental protection.
Five, the present invention can be widely used in city underground, light rail and the urban public transport such as rail, trackless, and comformability is good.
Six, this systems technology is advanced, reliable, and easy to operate, over-the-road expense is low, is convenient to implement.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the low frequency tractive power supply system structural representation of the embodiment of the present invention.
Fig. 2 is the three-level converter structural representation of the embodiment of the present invention.
Fig. 3 is a single-phase line one ground formula tractive power supply system structural representation of the embodiment of the present invention.
Fig. 4 is the single phase two-line formula tractive power supply system structural representation of the embodiment of the present invention.
Detailed description of the invention
Embodiment
Fig. 1 is the low frequency tractive power supply system structural representation of the embodiment of the present invention.The technical scheme adopted comprises traction substation SS and Traction networks OCS; Traction substation SS obtains power supply from utility network PS, the former limit of traction transformer TT is connected to through three-phase alternating-current switch MK, frequency converter UF is connected to again through the low-voltage three-phase AC switch LK on traction transformer TT limit, the traction side that frequency converter UF exports is that low frequency is single-phase and powered to Traction networks OCS and vehicle L by single-phase traction bus BB, single-phase traction bus BB divides left and right 2 feeder lines, and establish feeder breaker KL and KR, realize Traction networks OCS segmentation, so that maintenance and isolated fault.
Principle of work of the present invention is: powered to Traction networks by the single-phase low-frequency ac that the three-phase main-frequency convert alternating current of utility network is traction side through traction transformer and frequency converter at traction substation; In a certain fixed frequency of Traction networks line frequency f between 5Hz and 16Hz, and meet following formula: Traction networks failure removal time limit TS (ms)=relaying TR opening time (ms)+half cycle (ms), i.e. f=500/(TS-TR), TS>TR; Such as, require Traction networks failure removal time limit TS=60ms, relaying TR=20ms opening time, then half cycle=40ms, namely select Traction networks line frequency f=500/40=12.5Hz; To ask Traction networks failure removal time limit TS=60ms, relaying TR=10ms opening time, then half cycle=50ms, namely select Traction networks line frequency f=500/50=10Hz.In other words, half cycle is the Minimum Time Limit l of Traction networks failure removal.The Traction networks of each traction substation can UNICOM, implements through power supply, sees Fig. 3, Fig. 4.When traction substation SS interruption maintenance or Traction networks fault, turn off its frequency converter UF, then make relevant feeder breaker KL or KR separating brake.
Fig. 2 is the three-level converter structural representation of the traction substation of the embodiment of the present invention.In traction substation, traction transformer TT limit is connected with frequency converter UF through three-phase series reactor (can merge with the leakage reactance of traction transformer), frequency converter UF obtains DC current by three phase full bridge rectification, then outputs to Traction networks by the low frequency single phase alternating current that inversion obtains 5 to 16Hz; The traction side of frequency converter UF is connected with single-phase series reactor.
Demonstration shows, considers the factor of the aspects such as cost, reliability, degree of ripeness, and the three-level converter based on the IGBT circuit of 1700V or 3300V can large-scale application, and the Traction networks alternating-current voltage/AC voltage of its traction side is selected to be advisable at about 1200V-2000V.From now on, the Traction networks alternating-current voltage/AC voltage that the similar frequency converter of five level will export can bring up to 4000V.
Fig. 3 is a single-phase line one ground formula tractive power supply system structural representation of the embodiment of the present invention, and this sentences 3 traction substations for exemplifying.Arrange section post SP between adjacent traction substation, K12, K23 are respectively section post SP1 and SP2 inner breaker, are in closure state when circuit breaker K12, K23 are flat, with the Traction networks UNICOM by each traction substation, implement through power supply.During Traction networks generation earth fault between traction substation SS1 and section post SP1, first turn off the frequency converter UF1 of traction substation SS1, make the feeder breaker KR1 of traction substation SS1 and the circuit breaker K12 separating brake of section post SP1 again, excision fault, then open frequency converter UF1, recover the supply regular power in trouble free interval.
A single-phase line one ground formula power supply mode is widely used in the power supply of subway, light rail and tramway train, namely by contact system and return current rail () form Traction networks.Advantage is that Traction networks structure is simple, investment reduction, be convenient to maintenance, shortcoming be once human contact will with contact system and return current rail () forms loop, potential safety hazard is large, therefore, commonly uses closed-loop, unrelated person No Admittance.
Fig. 4 illustrates, the single phase two-line formula tractive power supply system structural representation of the embodiment of the present invention, still with 3 traction substations for exemplifying.Between adjacent traction substation SS, section post SP is set, K11 and K12 is the circuit breaker in section post SP1, and the circuit breaker in K22 and K23 section post SP2, is in closure state when K11 and K12, K22 and K23 are flat, with the Traction networks UNICOM by each traction substation, implement through power supply.During up (or descending) Traction networks generation earth fault between traction substation SS1 and section post SP1, first turn off the frequency converter UF1 of traction substation SS1, make up (or descending) feeder breaker KR11(or KR12 of traction substation SS1 again) with up circuit breaker KL21(or KL22 of section post SP1) separating brake, excise up (or descending) fault, then open frequency converter UF1, recover the supply regular power in trouble free interval.Single phase two-line formula traction power supply mode is widely used in the power supply of trackless and tramway train, namely forms Traction networks by two contact line (contact system).Advantage is all mutually insulated between two contact line and between two contact line and ground, once human body touches, human body still can not be made between contact line and ground to form loop, and safety performance is good; Shortcoming is Traction networks complex structure, troublesome maintenance.The exposed to contact urban public transport of the personnel that are applicable to.
Claims (2)
1. a low frequency tractive power supply system, is characterized in that: low frequency tractive power supply system is made up of traction substation SS and Traction networks OCS; Traction substation comprises traction transformer TT and frequency converter UF, and the former limit three of traction transformer is connected utility network PS, and secondary limit three is connected frequency converter UF; The traction side that frequency converter UF exports is that low frequency is single-phase and powered to Traction networks OCS and vehicle L by single-phase traction bus BB; The Traction networks of each traction substation can UNICOM, implements through power supply; In a certain fixed frequency of Traction networks line frequency f between 5Hz and 16Hz; Traction networks line frequency f is obtained by following formula: Traction networks failure removal time limit TS (ms)=relaying TR opening time (ms)+half cycle (ms); i.e. f=500/ (TS-TR), TS>TR.
2. a kind of low frequency tractive power supply system according to claim 1, it is characterized in that: described single-phase traction bus BB divides left and right two feeder lines, and establish two feeder breakers in left and right, realize Traction networks OCS segmentation and train not power-off is passed through, when traction substation interruption maintenance or traction side fault, turn off its frequency converter.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104648186A (en) * | 2015-03-13 | 2015-05-27 | 西南交通大学 | Trolley bus system |
| CN104979827A (en) * | 2015-07-06 | 2015-10-14 | 中国铁道科学研究院 | Electrified railway power supply device and system thereof |
| CN105470958B (en) * | 2015-12-31 | 2019-03-12 | 北京交通大学 | Tractive power supply system is directly handed in a kind of friendship of modular multilevel structure |
| CN111313431B (en) * | 2018-12-11 | 2023-10-20 | 西安许继电力电子技术有限公司 | Subway traction power supply system and reactive compensation control method and device thereof |
| CN111146823B (en) * | 2019-12-18 | 2021-06-22 | 北京交通大学 | High-voltage direct-current urban rail transit traction power supply system |
| CN112977181A (en) * | 2021-03-18 | 2021-06-18 | 清华大学 | Flexible alternating-current traction power supply system for realizing through same phase and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08230523A (en) * | 1995-02-28 | 1996-09-10 | Fuji Electric Co Ltd | Method and apparatus for controlling voltage of changeover section in ac feeder circuit |
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| GB2350094A (en) * | 1999-05-17 | 2000-11-22 | Abb Daimler Benz Transp | AC traction power supply system |
| CN101348086A (en) * | 2007-07-18 | 2009-01-21 | 北京交通大学 | Pulsating direct current traction electric power supply system |
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Effective date of registration: 20160630 Address after: 610031 Chengdu City, Sichuan Province, No. two North Ring Road, Southwest Jiao Tong University, Patentee after: Southwest Jiaotong University Patentee after: Li Qunzhan Address before: 610031 Chengdu City, Sichuan Province, No. two North Ring Road, Southwest Jiao Tong University, Patentee before: Southwest Jiaotong University |