CN103552488B - A kind of electrified railway two way feeding system - Google Patents
A kind of electrified railway two way feeding system Download PDFInfo
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- CN103552488B CN103552488B CN201310542875.XA CN201310542875A CN103552488B CN 103552488 B CN103552488 B CN 103552488B CN 201310542875 A CN201310542875 A CN 201310542875A CN 103552488 B CN103552488 B CN 103552488B
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Abstract
The invention discloses a kind of electrified railway two way feeding system, be made up of adjacent traction substation and Traction networks therebetween, section post, at the secondary limit of traction substation traction transformer tandem reactor respectively, the Traction networks UNICOM of its both sides is formed two way feeding to it by the circuit breaker in section post; The minimum value that the reactance value sum of two adjacent traction substation reactors=meet electric system euqalizing current requires; The ratio of the rated capacity of the ratio traction substation traction transformer adjacent with this of the reactance value of the reactor of adjacent traction substation and the leakage reactance value sum of corresponding traction transformer is inversely proportional to; Taking up an area for reducing traction substation, the reactor that traction transformer is connected in series with it can be merged into compacter high leakage reactance traction transformer; The present invention can cancel the electric phase-splitting between adjacent traction substation residing for subregion and not affect electric system and normally runs, advanced technology, easy to implement.
Description
Technical field
The present invention relates to a kind of electrified railway two way feeding system, particularly cancelled the two way feeding system of section post electricity phase-splitting by the electrified railway of handing over orthogonal electric train to draw.
Background technology
The structure that monophase system has is simple, construction cost is low, use and the advantage such as easy to maintenance, determines electric railway traction net and generally adopts single phase industrial frequence alternating current to be that electric train tracted load is powered.For making the uniform distribution as far as possible in three-phase electrical power system of single-phase tracted load, electric railway traction net have employed the scheme of rotation phase sequence, phase-splitting switched-mode power supply.With neutral section insulator segmentation between the adjacent service area at phase-splitting subregion place, form electric phase-splitting, also claim phase-splitting.Electricity phase-splitting is the weakest link of Traction networks and power supply bottleneck, and it is the most accidents caused that electric train leads to phase splitting, impact power supply and traffic safety.
Solve outside electric phase-splitting and have two kinds of methods: one is adopt automatic passing over of neutral section technology, and one is cancel electric phase-splitting.
For the former, along with the continuous rising of train speed, manually cannot carry out moving back level when driver, close auxiliary unit, disconnected line circuit breaker, cross neutral section, again co-host break road device by train inertia, close auxiliary unit, enter level restoration tractive output when having carried out phase-splitting, overhead contact line parts are burnt out because of arcing for preventing the charged logical phase splitting of electric train, even cause the accidents such as phase fault, automatic passing over of neutral section technology need be taked, train is charged to improve, the ability of the electric phase-splitting of safety.It is several that present stage mainly contains the floor switches automatic passing over of neutral section etc. on phase-splitting, vehicle-mounted automatic passing over of neutral section and post that automatically switched, but still there is the electric process of transient state that train in switching over leads to phase splitting, the switching surge that easy generation is larger or excess current, cause the accident such as Traction networks and mobile unit scaling loss, even there is automatic passing over of neutral section failure, still affect power supply reliability and safe train operation.Visible, even adopt automatic passing over of neutral section technology, electric phase-splitting link remains the weak link in whole tractive power supply system.
For the latter, then divide two kinds of situations: situation one adopts cophase supply technology, and to cancel the electric phase-splitting in traction substation exit, its key effectively administers negative-sequence current, makes non-equilibrium among three phase voltages reach Standard; Situation two implements two way feeding, and to cancel the electric phase-splitting residing for subregion, its key is the euqalizing current reducing to produce in Traction networks because Traction networks is in parallel with electric system, makes it reach allowed degree.
Obviously, cancel electric phase-splitting be solve electric railway traction net power bottleneck problem, strengthen the basic behave of its power supply and transport capacity.Meanwhile, administer negative-sequence current making non-equilibrium among three phase voltages reach Standard, reduce euqalizing current and the harmonious development making it reach allowed degree (as being less than the asymmetric and zero-sequence component that causes of three characteristics of the middle term transmission line structure) to be conducive to promoting electric power and railway.
The present invention proposes a kind of two way feeding system relating to electric phase-splitting residing for the electrified railway cancellation subregion handing over orthogonal electric train to draw.
Summary of the invention
Object of the present invention is just to provide a kind of electrified railway two way feeding system, cancels the electric phase-splitting between adjacent traction substation residing for subregion, and does not affect the normal operation of electric system.
The present invention solves its technical matters, and the technical scheme adopted is: a kind of electrified railway two way feeding system, by adjacent traction substation SS
kwith traction substation SS
k+1and Traction networks TN therebetween
k, section post SP
kand Traction networks TN
k+1composition, is characterized in that: traction substation SS
ktraction transformer TT
ksecondary limit tandem reactor L
k, traction substation SS
k+1traction transformer TT
k+1secondary limit tandem reactor L
k+1; Section post SP
kin circuit breaker by Traction networks TN
kwith Traction networks TN
k+1uNICOM, adjacent traction substation SS
kwith traction substation SS
k+1to Traction networks TN
kwith Traction networks TN
k+1form two way feeding.
For the traction substation that AT powers, reactor is also decomposed into two, is serially connected in traction transformer time limit respectively.
Principle of work of the present invention is: at traction substation SS
k, SS
k+1tandem reactor L respectively
k, L
k+1to reduce euqalizing current, the degree making it reach electric system to allow.So-called euqalizing current, refers to Traction networks and that at Traction networks produce extra current in parallel with electric system.During normal operation, adjacent traction substation SS
k, SS
k+1the reactor L be connected in series respectively
k, L
k+1its corresponding traction transformer TT of reactance value
k, TT
k+1leakage reactance value will determine the allocation proportion of electric train tracted load with the ratio of value; Power factor delayed and close to 1 friendship orthogonal electric train tracted load at traction substation SS
k(SS
k+1) reactor L
k(L
k+1) and traction transformer TT
k(TT
k+1) loss of voltage that leakage reactance produces is less, even power factor advanced and close to 1 friendship orthogonal electric train tracted load pass through time, also produce a certain amount of voltage and raise (negative voltage loss), therefore, tandem reactor does not affect supply regular power voltage levvl.Moreover, Traction networks be short-circuited fault time, traction substation SS
k(SS
k+1) the reactor L that is connected in series
k(L
k+1) can inductive reactor be used as, reduce short circuit current.
Concrete Selecting parameter is: traction substation SS
kreactor L
kreactance value and traction substation SS
k+1reactor L
k+1reactance value with the minimum value being worth=meeting electric system euqalizing current and require; Traction substation SS
kreactor L
kreactance value and traction transformer TT
kleakage reactance value with value/traction substation SS
k+1reactor L
k+1reactance value and traction transformer TT
k+1leakage reactance value with value=traction substation SS
k+1rated capacity/traction substation SS
krated capacity.
Further, in order to reduce occupation of land, the high leakage reactance traction transformer that can structure be caused more compact traction substation traction transformer and the reactor be connected in series combination system; The reactance value of the leakage reactance value+reactor of the leakage reactance value=former traction transformer of high leakage reactance traction transformer.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention is connected in series appropriate reactor at traction substation and can reduces euqalizing current, avoids it to produce unallowed harmful effect to electric system, thus cancels the electric phase-splitting residing for subregion, implements electrified railway two way feeding; And and then combine with the cophase supply technology of traction substation, realize powering without electric phase-splitting of the full railway line in same unified power system, electric railway traction is powered complete upgrading.
Two, the short circuit current of the present invention when traction substation tandem reactor can reduce Traction networks short circuit, thus alleviate the impact of short circuit current to the element such as traction transformer, circuit breaker, be conducive to type selecting and the disengagement failure of circuit breaker, improve functional reliability.
Three, the present invention selects the ratio of the rated capacity of the ratio of the leakage reactance value sum of its corresponding traction transformer of the reactance value of the reactor of adjacent traction substation traction substation traction transformer adjacent with this to be inversely proportional to, the tracted load of Traction networks can be made by this proportional distribution, and the capacity of traction substation traction transformer is utilized better.
Four, power factor delayed and close to 1 friendship orthogonal electric train tracted load traction substation reactor and the traction transformer loss of voltage that leakage reactance produces less, even power factor advanced and close to 1 friendship orthogonal electric train tracted load pass through time, also produce a certain amount of voltage and raise (negative voltage loss), reactor therefore involved in the present invention does not affect supply regular power voltage levvl.
Five, the present invention is except the traction substation that is suitable for directly power supply and Traction networks, also can be used for traction substation that AT powers and Traction networks thereof.
Six, the technology of the present invention is advanced, reliable, easy to implement.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Detailed description of the invention
Embodiment
As shown in Figure 1, a kind of electrified railway two way feeding system, the technical scheme adopted is: by adjacent traction substation SS
kwith traction substation SS
k+1and Traction networks TN therebetween
k, section post SP
kand Traction networks TN
k+1composition, traction substation SS
ktraction transformer TT
ksecondary limit tandem reactor L
k, traction substation SS
k+1traction transformer TT
k+1secondary limit tandem reactor L
k+1; Section post SP
kin circuit breaker by Traction networks TN
kwith Traction networks TN
k+1uNICOM, adjacent traction substation SS
kwith traction substation SS
k+1to Traction networks TN
kwith Traction networks TN
k+1form two way feeding.
For the traction substation that AT powers, reactor is also decomposed into two, is serially connected in traction transformer time limit respectively.
Principle of work of the present invention is: at traction substation SS
k, SS
k+1tandem reactor L respectively
k, L
k+1to reduce euqalizing current, the degree making it reach electric system to allow.So-called euqalizing current, refers to Traction networks and that at Traction networks produce extra current in parallel with electric system.During normal operation, adjacent traction substation SS
k, SS
k+1reactor L
k, L
k+1its corresponding traction transformer TT of reactance value
k, TT
k+1leakage reactance value will determine the allocation proportion of electric train tracted load with the ratio of value; Power factor delayed and close to 1 friendship orthogonal electric train tracted load at traction substation SS
k, SS
k+1reactor L
k, L
k+1with traction transformer TT
k, TT
k+1the loss of voltage that leakage reactance produces is less, even power factor advanced and close to 1 friendship orthogonal electric train tracted load by time, also produce a small amount of voltage and raise (negative voltage loss), therefore, the reactor of serial connection does not affect supply regular power voltage levvl.Moreover, Traction networks be short-circuited fault time, traction substation SS
k, SS
k+1the reactor L of serial connection
k, L
k+1can inductive reactor be used as, reduce short circuit current.
Concrete Selecting parameter is: traction substation SS
kreactor L
kreactance value and traction substation SS
k+1reactor L
k+1reactance value with the minimum value being worth=meeting electric system euqalizing current and require; Traction substation SS
kreactor L
kreactance value and traction transformer TT
kleakage reactance value with value/traction substation SS
k+1reactor L
k+1reactance value and traction transformer TT
k+1leakage reactance value with value=traction substation SS
k+1rated capacity/traction substation SS
krated capacity.
Further, in order to reduce occupation of land, according to the size of the leakage reactance value of traction transformer and the reactance value sum of reactor, the high leakage reactance traction transformer that can structure be caused more compact traction transformer and the reactor be connected in series combination system, certainly, the reactance value of the leakage reactance value+reactor of the leakage reactance value=former traction transformer of high leakage reactance traction transformer.
Suppose the 220kV power transmission line of electric system ABC in Fig. 1 with traction substation SS
kpoints of common connection PCC
kand with traction substation SS
k+1points of common connection PCC
k+1between length be 50km, points of common connection PCC
k(PCC
k+1) to traction substation SS
k(SS
k+1) power transmission line length be 10km, power transmission line adopts tripartition wire, i.e. unit head's impedance z
l=0.04+j0.3 Ω/km, traction transformer TT
kand TT
k+1rated capacity is 31.5MVA, and short circuit impedance gets 10.5%, and namely reduction is to the leakage impedance z of traction side
t=0.2134+j2.52 Ω; Adjacent traction substation distance is 50km; Traction networks non-load voltage is 27.5kV; Single track railway, single chain type hanging impedance of traction electric network z=0.232+j0.515 Ω/km; The traction transformer of adjacent traction substation all exports specified tracted load, and namely tracted load rated current is 1145A; For general fast electrified railway, if the power factor of tracted load LC is that 0.8(is delayed), the then loss of voltage=the 2013V of traction substation, handed over to the electrified railway of orthogonal electric train traction the modern times, if the power factor of tracted load LC is that 0.993(is delayed), then the loss of voltage=the 730V of traction substation, visible, the loss of voltage greatly reduces, and only has 1/2.758 of general fast railway; Simultaneously, because euqalizing current is Traction networks and that at Traction networks produce extra current in parallel with electric system, therefore, euqalizing current also can describe with the ratio of reduction to the impedance of traction electric network under unified voltage and electric system (power transmission line) impedance, ratio is larger, and euqalizing current is less.If the euqalizing current allowed is 1%, i.e. Traction networks and electric system parallel impedance ratio=100:1, now reactor L
k(L
k+1) the traction transformer TT of reactance value=1.73 times
k(TT
k+1) leakage reactance of traction side, i.e. 4.36 Ω, the corresponding traction substation loss of voltage=1522V; If require tandem reactor L further
k(L
k+1) before and after the loss of voltage of traction substation constant, then require by tracted load power factor by 0.993(power-factor angle=6.78 °, delayed) be adjusted to 0.9965(power-factor angle=4.8 °, advanced).
Further, take up an area to reduce traction substation, traction transformer and the reactor be connected in series combination system can be caused the high leakage reactance traction transformer of more compact structure, reactance value 1.73 × 2.52 Ω=6.88 Ω of 2.52 Ω+reactor is worth, i.e. short circuit impedance=2.73 × 10.5%=28.7% in the leakage reactance of the leakage reactance value=former traction transformer of this high leakage reactance traction transformer; If suppose, electric system is Infinite bus system, then corresponding Traction networks near-end short circuit current only has original 1/2.73.
Claims (2)
1. an electrified railway two way feeding system, by adjacent traction substation SS
kwith traction substation SS
k+1and Traction networks TN therebetween
k, section post SP
kand Traction networks TN
k+1composition, is characterized in that, traction substation SS
ktraction transformer TT
ksecondary limit tandem reactor L
k, traction substation SS
k+1traction transformer TT
k+1secondary limit tandem reactor L
k+1; Section post SP
kin circuit breaker by Traction networks TN
kwith Traction networks TN
k+1uNICOM, adjacent traction substation SS
kwith traction substation SS
k+1to Traction networks TN
kwith Traction networks TN
k+1form two way feeding; Traction substation SS
kreactor L
kreactance value and traction substation SS
k+1reactor L
k+1reactance value with the minimum value being worth=meeting electric system euqalizing current and require; Traction substation SS
kreactor L
kreactance value and traction transformer TT
kleakage reactance value with value/traction substation SS
k+1reactor L
k+1reactance value and traction transformer TT
k+1leakage reactance value with value=traction substation SS
k+1rated capacity/traction substation SS
krated capacity.
2. a kind of electrified railway two way feeding system according to claim 1, is characterized in that, traction transformer is caused high leakage reactance traction transformer with the reactor combination system be connected in series.
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| CN201310542875.XA CN103552488B (en) | 2013-11-05 | 2013-11-05 | A kind of electrified railway two way feeding system |
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| CN201310542875.XA CN103552488B (en) | 2013-11-05 | 2013-11-05 | A kind of electrified railway two way feeding system |
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| CN103552488B true CN103552488B (en) | 2015-11-25 |
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| CN104742917B (en) * | 2015-03-23 | 2017-04-19 | 国家电网公司 | Method for acquiring minimum voltage level of tractive power supply system in high-speed railway network |
| CN106864310B (en) * | 2017-03-16 | 2023-05-05 | 西南交通大学 | Power supply structure for electrified railway partition |
| CN112677831B (en) * | 2019-10-17 | 2023-03-24 | 中铁二院工程集团有限责任公司 | Gridding power supply method applied to multi-line electrified railway |
| CN113076660B (en) * | 2021-04-28 | 2023-01-31 | 中铁二院工程集团有限责任公司 | Electrified railway circulation calculation method adopting hybrid power supply system bilateral power supply mode |
| CN113258579B (en) * | 2021-06-28 | 2023-01-31 | 中铁二院工程集团有限责任公司 | Method for calculating short-circuit current of electrified railway of hybrid power supply mode bilateral power supply system |
| CN114336639B (en) * | 2022-03-17 | 2022-05-24 | 西南交通大学 | Intelligent traction substation and power flow control method thereof |
| CN114336643B (en) * | 2022-03-17 | 2022-05-17 | 西南交通大学 | System for utilizing passing power of bilateral power supply traction network of regional station and control method |
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| CN203611784U (en) * | 2013-11-05 | 2014-05-28 | 西南交通大学 | Two-side power supply system of electrified railway |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61191441A (en) * | 1985-02-20 | 1986-08-26 | Hitachi Ltd | Feeding device in substation for electric railway |
| JPS61278435A (en) * | 1985-06-03 | 1986-12-09 | Mitsubishi Electric Corp | Direct current feeding system for tramcar |
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|---|---|---|---|---|
| CN101428571A (en) * | 2008-12-03 | 2009-05-13 | 北京交通大学 | Direct net-attached mode of traction power supply high voltage synthetic compensating gear |
| CN201350850Y (en) * | 2009-02-23 | 2009-11-25 | 吴加林 | Non phase-split traction power supply for railway locomotive |
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Effective date of registration: 20160629 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 |
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Effective date of registration: 20161219 Address after: 100844 Fuxing Road, Beijing, Haidian District, No. 10 Patentee after: CHINA RAILWAY CORPORATION Patentee after: Xi-nan Jiatoong Univ. Address before: 610031 Chengdu City, Sichuan Province, No. two North Ring Road, Southwest Jiao Tong University, Patentee before: Xi-nan Jiatoong Univ. Patentee before: Li Qunzhan |