CN103326334A - Thyristor rectification tractive power supply system and protective method - Google Patents

Thyristor rectification tractive power supply system and protective method Download PDF

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CN103326334A
CN103326334A CN2013102067834A CN201310206783A CN103326334A CN 103326334 A CN103326334 A CN 103326334A CN 2013102067834 A CN2013102067834 A CN 2013102067834A CN 201310206783 A CN201310206783 A CN 201310206783A CN 103326334 A CN103326334 A CN 103326334A
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thyristor
traction substation
silicon controlled
controlled rectifier
work
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CN103326334B (en
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李群湛
黄彦全
刘炜
舒泽亮
郭育华
于松伟
李亚楠
黄足平
靳守杰
周伟志
陈民武
李子晗
张丽艳
周阳
夏焰坤
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Southwest Jiaotong University
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Abstract

The invention discloses a thyristor rectification tractive power supply system and a protective method. When a short-circuit fault occurs, the thyristor of a traction substation thyristor rectifier closest to a fault element is stopped from working; if the sum value of the fault mark values, measured and calculated after the thyristor is stopped from working, of the element is larger than or equal to 1, a permanent fault is determined, the thyristors of other traction substation thyristor rectifiers of a whole line are stopped from working, all related direct-current isolation switches are opened, the thyristors of the traction substation thyristor rectifiers of the whole line return to work, the power supply of the system is restored, and if the sum value is not larger than or equal to 1, a temporary fault is determined, the related thyristors return to work, and the normal power supply of the system is restored. According to the thyristor rectification tractive power supply system and the protective method, a direct-current breaker can be eliminated, investment is reduced, implementation is convenient, and the system is suitable for carrying out new line construction or old line improvement on fields with lines which are not too long (within 20km and less than 10 traction substations). When the lines are too long, a small number of direct-current breakers can be used for dividing the tractive power supply system.

Description

A kind of thyristor rectifier tractive power supply system and guard method
Technical field
The invention belongs to traffic and transport field, relate in particular to DC traction power-supply system system and the relay protecting method of thyristor rectifier.
Background technology
DC traction power-supply system refers to obtain galvanic tractive power supply system from the AC power of utility network through rectification, and is multiplex in the power supply of the urban track traffics such as subway, light rail and streetcars.DC traction power-supply system is comprised of traction substation and traction net, usually, independently (middle pressure) AC power and two form the 12 pulse traction rectifier units formations of equivalent 24 pulse waves to traction substation side by side by two-way, the traction rectifier unit is made of traction transformer and diode rectifier and annex, and the traction net is by contact line (or conductor rail) and rail formation.DC traction power-supply system is in operation various faults may occur; what take on discovery and excision fault task is protective relaying device; wherein the most common and be that the most dangerous fault is exactly various types of short troubles; the minimum short circuit current that causes of resistance of the traction net of general DC traction power-supply system is very big; if can not in time find and excise short trouble; it is very harmful; therefore; relaying protection is the important step of safety of urban transit operation; how timely; find exactly; excision; isolation is also further fixed a breakdown; various types of short troubles particularly, and guarantee that to greatest extent the normal power supply between fault-free service area is to ensure city rail safety; the Important Action of good operation.
During the used dc circuit breaker disengagement failure of DC traction power-supply system DC side, owing to there not being current zero-crossing point, so extinguish arcs, dissipation arc energy and inhibition are cut-off overvoltage etc. and are become and need the difficult problem that solves.For solving these difficult problems, it is more complicated that the dc circuit breaker technology is compared AC circuit breaker, and manufacture difficulty is larger, cost is higher, affects conversely again its reliability and useful life.Up to the present, the dc circuit breaker that China is used for the urban track traffic DC traction power-supply system is dependence on import still, has also increased the operation and maintenance expense.Obviously, saving dc circuit breaker is the Important Action that improves DC traction power-supply system technical performance and economic performance.
For overcoming the deficiencies in the prior art, utilize as much as possible existing maturation, reliable power supply unit, the present invention is modified into the rectification function equivalence of deciliter (separating brake, the combined floodgate) function that exchanges lead-in circuit breaker and diode rectifier the function of silicon controlled rectifier, to overcome machinery and the short shortcoming of electrical endurance that exchanges this mechanical switch of lead-in circuit breaker, the long-life advantage of performance this noncontacting switch of thyristor, be more suitable for excising, isolating the short trouble than frequent occurrence, further improve the overall performance of tractive power supply system.That is to say, under normal circumstances, silicon controlled rectifier and the original the same rectification function of finishing from AC-to DC of diode rectifier; During fault, cut-off signals outputs to the trigger end (gate circuit transistor gate) of silicon controlled rectifier through circuits for triggering, closes after the voltage zero-cross thyristor bears back-pressure, electric current decline and zero passage and has no progeny, and silicon controlled rectifier quits work.In this sense, silicon controlled rectifier=electronic AC switch used herein+diode rectifier.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of DC traction power-supply system dc circuit breaker, replace diode rectifier with silicon controlled rectifier of saving is provided, save investment, improve the system power supply reliability, ensure better train safe, running on time.
The present invention solves its technical problem, and the technical scheme that adopts is:
DC traction power-supply system is comprised of traction substation and traction net, and the traction net is made of traction substation SS contact line and rail kComprise three-phase alternating current lead-in circuit breaker QFJ k, traction transformer TT k, silicon controlled rectifier U k, direct current feed isolating switch QSZ kAnd current transformer LH k, dc bus B kAnd voltage transformer YH k, dc feeder isolating switch QSZ K, 1, QSZ K, 2And current transformer LH K, 1, LH K, 2And dc bus protective device, dc feeder failure protecting device; The dc feeder failure protecting device comprises current quick, current changing rate di/dt and increment
Figure BDA00003268178400021
Protection; Voltage transformer YH kMeasuring junction, current transformer LH kSummation current transformer LH K, 1, LH K, 2Measuring junction and silicon controlled rectifier U kTrigger end and direct current feed isolating switch QSZ kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Control end all with measurement and control unit MC kLink to each other; Dc bus protective device outlet MJ k, dc feeder failure protecting device outlet KJ K, 1, KJ K, 2With silicon controlled rectifier U kTrigger end link to each other; Measurement and control unit MC kBe connected with scheduling controlling chamber DC by measurement and control network DT, k=1,2 ..., N(N is the sum of traction substation).
The present invention also aims to provide by the match relaying protection new method of the various short troubles of incompatible excision DC traction power-supply system of silicon controlled rectifier and traction side direct-current isolating switch; with running status timely, the monitor system; the fault type of judgement system and abort situation; and isolate rapidly and excise fault; dwindle to greatest extent fault and coverage; improve the system power supply reliability, ensure better train safe, running on time.Its concrete means are:
The guard method of a kind of thyristor rectifier tractive power supply system realizes judgement and the excision of short trouble in the thyristor rectifier tractive power supply system that is made of traction substation and traction net, wherein:
Judgement and the cutting method of traction substation dc bus short trouble: traction substation SS kDc bus protective device outlet MJ kDuring the output sub-gate signal, directly make silicon controlled rectifier U kThyristor quit work; Measurement and control unit MC kDc feeder current transformer LH K, 1, LH K, 2Measure greater than 0 and flow into this dc bus B kCalibration with current signal be this dc bus B kShort trouble trend value of symbol=1, greater than 0 and flow out this dc bus B kCalibration with current signal be this dc bus B kShort trouble trend value of symbol=-1, equaling 0 calibration with current signal is this dc bus B kThe unloaded trend value of symbol of short circuit=0, calculate this dc bus B kShort trouble trend value of symbol and the value: if silicon controlled rectifier U kQuit work this dc bus B of rear measurements and calculations of thyristor kShort trouble trend value of symbol with the value more than or equal to 1, then judge this dc bus B kThe permanent earth short trouble occurs, by measurement and control unit MC kThrough measurement and control network DT this fault message is uploaded to scheduling controlling chamber DC, the scheduling controlling chamber DC order completely thyristor of traction substation silicon controlled rectifier quits work, again through measurement and control unit MC kOrder and this dc bus B kThe direct current feed isolating switch QSZ that is connected kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Separating brake, scheduling controlling chamber DC resumes work through the thyristor of measurement and control network DT order all fronts traction substation silicon controlled rectifier subsequently, and system restores electricity, scheduling controlling chamber DC record: the dc bus B of this traction substation kThe permanent earth short trouble having occured, be isolated, demands urgently getting rid of; If silicon controlled rectifier U kThe thyristor rear measurement and control unit MC that quits work kThrough dc feeder current transformer LH K, 1, LH K, 2This dc bus B of measurements and calculations kShort trouble trend value of symbol with value be 0, showing phylogenetic is transient fault and disappearing, then the out-of-work silicon controlled rectifier U of order kThyristor resume work, normal power supply recovers in system;
The traction substation SS that connects contact line branch road T one end is connected in the judgement of the contact line branch, short-circuit fault of traction net with cutting method kDc feeder failure protecting device outlet output sub-gate signal the time, directly make silicon controlled rectifier U kThyristor quit work, connect the traction substation SS of the contact line branch road T other end K+1Dc feeder failure protecting device outlet output sub-gate signal the time, directly make silicon controlled rectifier U K+1Thyristor quit work; Traction substation SS k(SS K+1) measurement and control unit MC k(MC K+1) to voltage transformer YH k(YH K+1) the silicon controlled rectifier U that measures k(U K+1) the dc bus B of thyristor before and after quitting work k(B K+1) difference of voltage calculates, difference is demarcated greater than 0 and is the port failure voltage sign value of this contact line branch road T=1, it is the port failure voltage sign value of this contact line branch road T=-1 that difference is demarcated less than 0, and it is the port failure voltage sign value of this contact line branch road T=0 that difference equals 0 demarcation; Measurement and control unit MC k(MC K+1) according to silicon controlled rectifier U k(U K+1) the voltage transformer YH of thyristor before quitting work k(YH K+1) voltage of measuring and Current calculation short-circuit resistance and the fault point distance of this dc feeder current transformer measurement; Measurement and control unit MC k(MC K+1) through measurement and control network DT port failure voltage sign value is uploaded to scheduling controlling chamber DC, calculate this contact line branch road T port failure voltage sign value and value, minute following A, B, three kinds of situations of C:
If A traction substation SS kSilicon controlled rectifier U kWith traction substation SS K+1Silicon controlled rectifier U K+1Thyristor all quit work and the port failure voltage sign value of this contact line branch road T of calculating and value=2, then judge from traction substation SS kAnd SS K+1This contact line branch road T of seeing into of dc feeder the permanent earth short trouble has all occured, scheduling controlling chamber DC passes down order through measurement and control network DT and makes completely to each measurement and control unit the thyristor of traction substation silicon controlled rectifier all quits work, and makes the dc feeder isolating switch QSZ at the two ends that link to each other with this contact line branch road T again K, 2And QSZ K+1,1Separating brake, the subsequently order completely thyristor of traction substation silicon controlled rectifier is all resumed work, and system restores electricity, scheduling controlling chamber DC record: the permanent earth short trouble has occured in this contact line branch road T, be isolated, demand urgently getting rid of, and show the fault point distance;
If B traction substation SS kSilicon controlled rectifier U kWith traction substation SS K+1Silicon controlled rectifier U K+1Thyristor all quit work and the port failure voltage sign value of this contact line branch road T of calculating with value less than 1, show that phylogenetic is that transient fault also disappears, then the thyristor of the out-of-work relevant traction substation silicon controlled rectifier of order is resumed work, and normal power supply recovers in system;
If C traction substation SS k(SS K+1) silicon controlled rectifier U k(U K+1) thyristor quit work and traction substation SS K+1(SS k) silicon controlled rectifier U K+1(U k) thyristor still the port failure voltage sign value of work and this contact line branch road T of calculating and value=1, illustrate that then this contact line branch road T is from traction substation SS k(SS K+1) end sees into the permanent earth short trouble has occured, and from traction substation SS K+1(SS k) end sees into (broken string) fault occured to open circuit, scheduling controlling chamber DC through measurement and control network DT pass down order to each measurement and control unit order completely the thyristor of traction substation silicon controlled rectifier quit work, make again traction substation SS k(SS K+1) the dc feeder isolating switch QSZ of an end K, 2(QSZ K+1,1) separating brake, the subsequently order completely thyristor of traction substation silicon controlled rectifier is resumed work, and system restores electricity, scheduling controlling chamber DC record: from traction substation SS k(SS K+1) end sees into that the permanent earth short trouble has occured this contact line branch road T, is isolated, demand urgently getting rid of, from traction substation SS K+1(SS k) this contact line branch road T of seeing into of an end occured to open circuit or disconnection fault, be not isolated, and show the fault point distance; If traction substation SS k(SS K+1) silicon controlled rectifier U k(U K+1) thyristor quit work and traction substation SS K+1(SS k) silicon controlled rectifier U K+1(U k) thyristor still the port failure voltage sign value of work and this contact line branch road T of calculating with value less than 1, show phylogeneticly to be instantaneity earth fault and to disappear, then the out-of-work traction substation SS of order k(SS K+1) silicon controlled rectifier U K+1(U k) thyristor resume work, system restores electricity, scheduling controlling chamber DC record: from traction substation SS K+1(SS k) this contact line branch road T of seeing into of an end occured to open circuit or disconnection fault, demanded urgently processing, and show the fault point distance
The present invention is under power frequency (50Hz), thyristor from direct current protecting device outlet output sub-gate signal to the traction substation silicon controlled rectifier quit work (the voltage zero-cross thyristor bears back-pressure, electric current descends and zero passage then turn-off), need at most in theory the power frequency cycle half, be 10ms, therefore, can very fast cutting-off of short-circuit fault; Simultaneously, for permanent short trouble, no matter be the contact line branch road between dc bus or service area, its capacity of short circuit will quit work because of the thyristor of nearest traction substation silicon controlled rectifier, it is the excision of nearest power supply and die down, reduce, short circuit current reduces thereupon, and harm also decreases.Simultaneously, system is short-circuited after the fault, net is pressed greatly and is reduced, generally can't guarantee the train normal operation, the driving hidden danger that may cause for eliminating short trouble should have the train operation adjustment prediction scheme, therefore in short trouble excision, isolation and exclusion process, process permanent short trouble and open circuit (broken string) fault and the utmost point in short-term in order completely the thyristor of traction substation silicon controlled rectifier to operate the impact that produces be normal, or even negligible.Also just because of this, for reducing too much impact, the present invention be more suitable for not oversize circuit (as 20 kilometers with interior, be less than 10 traction substations) occasion, but its basic skills still can be used in the practice than long transmission line.At this moment, the too much traction substation silicon controlled rectifier of operation causes unnecessary impact when being short-circuited fault for reducing long transmission line, and available dc circuit breaker carries out subregion to the DC traction power-supply system of long transmission line.At this moment, when judging a certain dc bus in certain subregion or contact line branch road generation permanent earth short trouble with the inventive method, at first make the thyristor of other traction substation silicon controlled rectifiers in this subregion quit work, then disconnect the dc circuit breaker at these subregion two ends, make again relevant direct-current isolating switch separating brake, make subsequently the dc circuit breaker at these subregion two ends close a floodgate, make the thyristor of all traction substation silicon controlled rectifiers in this subregion resume work, system restores electricity.Obviously, be used for the dc circuit breaker quantity that the dc circuit breaker of subregion will use far less than each existing traction substation.
The dc feeder failure protecting device refers to current quick, current changing rate di/dt and the increment of existing traction substation DC feeder protection configuration
Figure BDA00003268178400061
Protection reflects the dc feeder short trouble, and in addition, other protections such as the contact line thermal overload protection, are joined jumping etc. by the DC equipment frame leakage protection for apolegamy in addition.If match these protective devices; then its outlet also should be connected with the measurement and control unit of locality and the trigger end of silicon controlled rectifier; carry out the completely control and local direct current feed isolating switch, the corresponding breaking-closing operating of dc feeder isolating switch of the thyristor of silicon controlled rectifier through measurement and control network again, with isolated fault.
In like manner can process the indirect short trouble of touching net of dc bus and service area that multiple line track and double cross flow to the traction substation of line (two traction transformers), two dc buss.
Obviously, adopt the present invention program, because each traction substation power supply capacity of a circuit is basic identical, the capacity of short circuit of fault point be short-circuited after the traction substation quantity of excision (quitting work) nearby relevant, excision is more nearby, capacity of short circuit is just less, the harm that short circuit causes is just less, but the scope that affects normal power supply will be larger, therefore, should be weighed between the two.For example, the harm that causes for further reducing capacity of short circuit and short trouble can be at dc bus B kWhen earth fault occurs, except traction substation SS kOutward, also through traction substation SS kMeasure and control device MC kMake traction substation SS by measurement and control network DT kTwo traction substation SS that front and back are adjacent K-1With SS K+1The thyristor of silicon controlled rectifier quits work; When contact line branch road T was short-circuited fault, not only order connected the traction substation SS of contact line branch road T k, SS K+1The thyristor of silicon controlled rectifier quits work, and also can further make traction substation SS k, SS K+1The traction substation SS of front and back K-1And SS K+2The thyristor of silicon controlled rectifier quits work.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention can save dc circuit breaker, can avoid being conducive to improve system reliability because the dc circuit breaker failure of interruption causes serious consequence; Avoid simultaneously import, realize that the track traffic electric equipment all domesticizes.
Two, the present invention can avoid the reclosing of circuit breaker and to the impact of power supply unit, be conducive to improve equipment dependability and useful life.
Three, the present invention utilizes the electronic switch function of silicon controlled rectifier, be a kind of noncontacting switch, switching loss is zero in theory, its life-span is long and irrelevant with the number of times of shutoff, conducting, can greatly save operating cost and the maintenance cost of system in the same fashion of the great number investment of saving the dc circuit breaker generation.
Four, the technology of the present invention is ripe, advanced, reliable, and it is convenient to implement, and namely is convenient to the ew line construction, also is convenient to old line transformation.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the traction substation structural representation of the embodiment of the invention;
Fig. 2 is the traction substation observing and controlling structural representation of the embodiment of the invention;
Fig. 3 is power supply state measurement and control network schematic diagram;
Fig. 4 is traction substation DC bus fault schematic diagram;
Fig. 5 is traction substation DC bus fault estimation ﹠ disposing schematic flow sheet;
Fig. 6 is the traction substation schematic diagram of two traction rectifier units, single DC bus structure;
Fig. 7 is the traction substation schematic diagram of two traction rectifier units, two DC bus structures;
Fig. 8 is service area's branch trouble schematic diagram of indirectly touching net.
Fig. 9 is service area's branch trouble estimation ﹠ disposing schematic flow sheet of indirectly touching net.
Embodiment
Below take No. 3 line subway engineerings in certain city as example: this line adopts 1500V DC traction power-supply system, total length 18.84km, totally 9 traction substations.Up (descending) direction contact line resistance 0.0135 Ω/km, up (descending) direction rail resistance 0.0137 Ω/km adopts two 12 pulse wave rectifier units to compose in parallel equivalent 24 pulse waves operation.
Fig. 1 illustrates, and the traction substation structural representation of the embodiment of the invention is two traction substation SS that adjoin mutually among the figure kAnd SS K+1Traction substation SS kComprise traction transformer TT k, three-phase alternating current lead-in circuit breaker QFJ k, silicon controlled rectifier U k, direct current feed isolating switch QZS k, dc bus B k, dc feeder isolating switch QSZ K, 1, QSZ K, 2Deng.Dc feeder isolating switch QSZ K, 1And QSZ K, 2Connect contact line OCS, negative pole isolating switch QSZ K*One termination rail G, direct current feed isolating switch QSZ kWith negative pole isolating switch QSZ K*Between interlocking is set.
Fig. 2 is the traction substation observing and controlling structural representation of the embodiment of the invention.At traction substation SS kIn, voltage transformer YH kMeasuring junction, current transformer LH kSummation current transformer LH K, 1, LH K, 2Measuring junction and silicon controlled rectifier U kTrigger end, direct current feed isolating switch QSZ kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Control end and measurement and control unit MC kLink to each other: measurement and control unit MC kBy voltage transformer YH kMeasuring junction, current transformer LH kSummation current transformer LH K, 1, LH K, 2Measuring junction obtain electric parameters, demarcate port voltage fault value of symbol, calculate fault point resistance and distance, further the character of failure judgement, simultaneously measurement and control unit MC kBy silicon controlled rectifier U kTrigger end, direct current feed isolating switch QSZ kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Control end carry out break-make (whether working), deciliter (separating brake, a combined floodgate) operates and obtains its break-make, deciliter state information; Dc bus protective device outlet MJ k, dc feeder failure protecting device outlet KJ K, 1, KJ K, 2With silicon controlled rectifier U kTrigger end link to each other, utilize the existing dc bus protective device outlet MJ of traction substation k, dc feeder failure protecting device outlet KJ K, 1, KJ K, 2The sub-gate signal of output directly acts on the silicon controlled rectifier U of this traction substation kTrigger end make and quit work; Measurement and control unit MC kBe connected with scheduling controlling chamber DC by measurement and control network DT, k=1,2 ..., N(N is the sum of traction substation).
Fig. 3 is depicted as the measurement and control network schematic diagram.Measurement and control network DT is responsible for the real time information exchange of scheduling controlling chamber DC and each traction substation measurement and control unit MC.Scheduling controlling chamber DC receives the synchronizing information that each measurement and control unit MC uploads by measurement and control network DT, gather, identify and judge the running status of system, assign control command, the measurement and control unit of each traction substation is responsible for receiving and is carried out control command, gathers, transmits electric current, voltage data and silicon controlled rectifier U kBreak-make information and deciliter information of direct-current isolating switch, demarcate the fault value of symbol, calculate fault point resistance and distance etc.The data channel of measurement and control network DT generally adopts optical fiber, and it can be combined with microcomputer telecontrol system and comprehensive protector utilization.
Fig. 4 is the traction substation DC bus fault schematic diagram of embodiment.
Traction substation SS kDc bus protective device outlet MJ kDuring the output sub-gate signal, directly make silicon controlled rectifier U kThyristor quit work; Measurement and control unit MC kDc feeder current transformer LH K, 1, LH K, 2Measure greater than 0 and flow into this dc bus B kCalibration with current signal be this dc bus B kShort trouble trend value of symbol=1, greater than 0 and flow out this dc bus B kCalibration with current signal be this dc bus B kShort trouble trend value of symbol=-1, equaling 0 calibration with current signal is this dc bus B kThe unloaded trend value of symbol of short circuit=0, calculate this dc bus B kShort trouble trend value of symbol and the value: if silicon controlled rectifier U kThe quit work direct current inlet wire short circuit current I of rear measurement of thyristor k=0(is because of silicon controlled rectifier U kThyristor quit work), two dc feeder current transformer LH K, 1, LH K, 2The short circuit current I of two dc feeders of measuring respectively K, 1, I K, 2Amplitude all greater than 0 and as shown in Figure 4 direction all flow into this dc bus B k, then demarcate two dc feeders to this dc bus B kShort trouble trend value of symbol all=1, calculate itself and value=2, namely with the criterion that is worth satisfied " more than or equal to 1 ", then judge this dc bus B kThe permanent earth short trouble occurs, by measurement and control unit MC kThrough measurement and control network DT this fault message is uploaded to scheduling controlling chamber DC, scheduling controlling chamber DC order is other traction substation silicon controlled rectifiers U completely kThyristor quit work, again through measurement and control unit MC kOrder and this dc bus B kThe direct current feed isolating switch QSZ that is connected kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Separating brake, scheduling controlling chamber DC is through measurement and control network DT order all fronts traction substation silicon controlled rectifier U subsequently kThyristor resume work, system restores electricity, control room DC record: the dc bus B of this traction substation kThe ground short circuit fault occuring be isolated, demands urgently getting rid of; If silicon controlled rectifier U kThe thyristor rear measurement and control unit MC that quits work kThrough direct current inlet wire current instrument transformer LH kThe direct current inlet wire short circuit current I that measures k=0(is because of silicon controlled rectifier U kThyristor quit work), two dc feeder current transformer LH K, 1, LH K, 2The dc feeder short circuit current I that measures respectively K, 1, I K, 2All greater than 0 and in Fig. 4 electric current I K, 1Be "+" I K, 2Be "-", i.e. I K, 1Flow into this dc bus B kCount its Fault load flow value of symbol=1, and I K, 2Flow out this dc bus B kCount its Fault load flow value of symbol=-1, get itself and value=0, namely do not satisfy the criterion of " more than or equal to 1 " with value, perhaps on the contrary, silicon controlled rectifier U kThe thyristor rear measurement and control unit MC that quits work kThrough direct current inlet wire current instrument transformer LH kThe direct current inlet wire short circuit current I that measures k=0(is because of silicon controlled rectifier U kThyristor quit work), through dc feeder current transformer LH K, 1, LH K, 2The two dc feeder electric current I of measuring K, 1, I K, 2All greater than 0 and as shown in Figure 4 directional current I K, 1Be "-" I K, 2Be "+", i.e. I K, 1Flow out this dc bus B kCount its Fault load flow value of symbol=-1, and I K, 2Flow into this dc bus B kCount its Fault load flow value of symbol=1, get itself and value=0, namely do not satisfy the criterion of " more than or equal to 1 " with value, show phylogeneticly to be transient fault and to disappear, then the out-of-work silicon controlled rectifier U of order kThyristor resume work, normal power supply recovers in system.
Consider by direct current feed isolating switch QSZ kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Separating brake excise and isolate the dc bus B that the permanent earth short trouble occurs kTo make this traction substation SS kInterruption of power supply can be at two dc feeder isolating switch QSZ K, 1, QSZ K, 2Between vertical connection isolating switch is set, at all fronts traction substation silicon controlled rectifier U kThe thyristor gap that stops and resuming work, should indulge the connection isolating switch and close a floodgate, realizes bilateral greatly (more district) power supply, with improvement because of traction substation SS kDc bus B kFault and system power supply ability when out of service; Traction substation SS kDc bus B kAfter fault was got rid of, this indulged connection isolating switch separating brake, recovered the normal power supply of this traction substation.
Traction substation DC bus fault estimation ﹠ disposing flow process is summarised among Fig. 5.
Shown in Fig. 6 is the traction substation schematic diagram of two Rectification Power Factor and single DC bus structure, and every Rectification Power Factor is in series two Rectification Power Factor paired runnings by a traction transformer and a cover silicon controlled rectifier.Obviously, when judging this DC bus fault, should with season this traction substation the thyristor of two road silicon controlled rectifiers carry out simultaneously break-make (whether work) and operate, other are identical with situation shown in Figure 4.
Shown in Fig. 7 is the traction substation of two Rectification Power Factor, two DC bus structures on Fig. 4 and Fig. 6 basis, wherein, and two dc bus B K, 1And B K, 2In the situation that breaks down respectively of each bus identical with Fig. 4 and Fig. 6, repeat no more.
In Fig. 6 and Fig. 7, MVB presses bus in exchanging.
Fig. 8 is (up direction) contact line branch road T fault schematic diagram between the service area of embodiment.Divide following A, B, three kinds of situations of C:
The traction substation SS at A, connection contact line branch road T two ends k, SS K+1Dc feeder failure protecting device outlet all export sub-gate signal, make respectively silicon controlled rectifier U kAnd U K+1Thyristor quit work; Measurement and control unit MC k(MC K+1) according to silicon controlled rectifier U k(U K+1) the voltage transformer YH of thyristor before quitting work k(YH K+1) voltage of measuring and Current calculation short-circuit resistance and the fault point distance of this dc feeder current transformer measurement; Traction substation SS kAnd SS K+1Voltage transformer YH kAnd YH K+1The silicon controlled rectifier U that measures kAnd U K+1The dc bus B of thyristor before quitting work k, B K+1Voltage is respectively 1179V and 1195V, voltage transformer YH kAnd YH K+1The silicon controlled rectifier U that measures kAnd U K+1The dc bus B of thyristor after quitting work k, B K+1Voltage is respectively 759V and 804V, and the difference of thyristor before and after quitting work is respectively 420V and 391V, and the two is all greater than 0, and then the port failure voltage sign value of this contact line branch road T=1, measurement and control unit MC are all demarcated in two ends kAnd MC K+1Through measurement and control network DT port failure voltage sign value is uploaded to scheduling controlling chamber DC, calculate this contact line branch road T port failure voltage sign value and value=2, then judge from traction substation SS kAnd SS K+1This contact line branch road T of seeing into of dc feeder two ends the permanent earth short trouble has all occured, scheduling controlling chamber DC passes order to each measurement and control unit under measurement and control network DT, the order completely thyristor of other traction substation silicon controlled rectifiers quits work, and makes the two ends dc feeder isolating switch QSZ that links to each other with this contact line branch road T again K, 2, QSZ K+1,1All separating brake makes the thyristor of all fronts traction substation silicon controlled rectifier resume work subsequently, and system restores electricity, scheduling controlling chamber DC record: the permanent earth short trouble has occured in this contact line branch road T that sees into from two ends, be isolated, demand urgently getting rid of, and show the fault point distance;
The traction substation SS at B, connection contact line branch road T two ends k, SS K+1Dc feeder failure protecting device outlet all export sub-gate signal, make respectively silicon controlled rectifier U kAnd U K+1Thyristor quit work; Measurement and control unit MC k(MC K+1) according to silicon controlled rectifier U k(U K+1) the voltage transformer YH of thyristor before quitting work k(YH K+1) voltage of measuring and Current calculation short-circuit resistance and the fault point distance of this dc feeder current transformer measurement; Traction substation SS kAnd SS K+1Voltage transformer YH kAnd YH K+1The silicon controlled rectifier U that measures kAnd U K+1The dc bus B of thyristor before quitting work k, B K+1Voltage is respectively 1179V and 1195V, voltage transformer YH kAnd YH K+1The silicon controlled rectifier U that measures kAnd U K+1The dc bus B of thyristor after quitting work kAnd B K+1Voltage is respectively 1354V and 1321V, the difference of thyristor before and after quitting work be respectively-175V and-126V, the two is all less than 0, then the port failure voltage sign value of this contact line branch road T=-1, measurement and control unit MC are all demarcated in two ends kAnd MC K+1Through measurement and control network DT port failure voltage sign value is uploaded to scheduling controlling chamber DC, calculate this contact line branch road T port failure voltage sign value and value=-2, namely and the value less than 1, show that phylogenetic is that transient fault also disappears, then the thyristor of the out-of-work relevant traction substation silicon controlled rectifier of order is resumed work, and normal power supply recovers in system;
The traction substation SS of C, connection contact line branch road T one end kDc feeder failure protecting device outlet output sub-gate signal the time, directly make this brake tube rectifier U kThyristor quit work, and connect the traction substation SS of the contact line branch road T other end K+1Dc feeder failure protecting device outlet do not export sub-gate signal, then illustrate from traction substation SS kDc feeder one end see into that the ground short circuit fault has occured this contact line branch road T, and from traction substation SS K+1Dc feeder one end see into this contact line branch road T (broken string) fault that occured to open circuit, its silicon controlled rectifier U K+1Thyristor keep normal operating conditions; Measurement and control unit MC kAccording to this silicon controlled rectifier U kThe voltage transformer YH of thyristor before quitting work kCurrent calculation short-circuit resistance and fault point distance that the voltage of measuring and this dc feeder current transformer are measured; Consider traction substation SS kVoltage transformer YH kMeasurement result and judge that thus the ground short circuit fault that this contact line branch road T occurs is nonvolatil or instantaneity.As, voltage transformer YH kThe silicon controlled rectifier U that records kThe dc bus B of thyristor before quitting work kVoltage is 1050V, the dc bus B after quitting work kVoltage is 759V, and the difference of front and back is 291V, greater than 0, then demarcates connection traction substation SS kThe port failure voltage sign value of this contact line branch road T of dc feeder one end be 1, measurement and control unit MC kThrough measurement and control network DT this port failure voltage sign value is uploaded to scheduling controlling chamber DC, calculate this contact line branch road T port failure voltage sign value and value=1, then judge from traction substation SS kThis contact line branch road T of seeing into of dc feeder one end the permanent earth short trouble has occured, scheduling controlling chamber DC passes order to each measurement and control unit under measurement and control network DT, the order completely thyristor of other traction substation silicon controlled rectifiers quits work, and makes this end dc feeder isolating switch QSZ that links to each other with this contact line branch road T again K, 2Separating brake, the subsequently order completely thyristor of traction substation silicon controlled rectifier is resumed work, and system restores electricity, scheduling controlling chamber DC record: from traction substation SS kThis contact line branch road T of seeing into of dc feeder one end the permanent earth short trouble has occured, be isolated, demand urgently getting rid of, the other end (broken string) fault that occured to open circuit is not isolated, and demonstration fault point distance; If voltage transformer YH kThe silicon controlled rectifier U that records kThe dc bus B of thyristor before quitting work kVoltage is 1050V, the dc bus B after quitting work kVoltage is 1354V, and namely the difference of front and back is-304V, less than 0, then demarcates connection traction substation SS kThe port failure voltage sign value=-1 of this contact line branch road T of dc feeder one end, measurement and control unit MC kAnd MC K+1Through measurement and control network DT this port failure voltage sign value is uploaded to scheduling controlling chamber DC, the port failure voltage sign value of this contact line branch road T that calculates and value=-1, namely and value less than 1, showing phylogenetic is transient fault and disappearing, then the out-of-work traction substation SS of order kSilicon controlled rectifier U kThyristor resume work, system restores electricity, control room DC record: this contact line branch road T other end (broken string) fault that opens circuit, demand urgently processing, and show the fault point distance.
Obviously, discrimination principles, process and the method for operation of down direction contact line branch road T fault repeat no more with upper identical.Service area's branch trouble estimation ﹠ disposing flow process of indirectly touching net is summarised among Fig. 9.

Claims (2)

1. thyristor rectifier tractive power supply system, its system consists of and is: DC traction power-supply system is comprised of traction substation and traction net, and the traction net is comprised of contact line and rail, it is characterized in that: traction substation SS kComprise three-phase alternating current lead-in circuit breaker QFJ k, traction transformer TT k, silicon controlled rectifier U k, direct current feed isolating switch QSZ kAnd current transformer LH k, dc bus B kAnd voltage transformer YH k, dc feeder isolating switch QSZ K, 1, QSZ K, 2And current transformer LH K, 1, LH K, 2And dc bus protective device, dc feeder failure protecting device; At traction substation SS kIn, voltage transformer YH kMeasuring junction, current transformer LH kSummation current transformer LH K, 1, LH K, 2Measuring junction and silicon controlled rectifier U kTrigger end and direct current feed isolating switch QSZ kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Control end all with measurement and control unit MC kLink to each other; Dc bus protective device outlet MJ k, dc feeder failure protecting device outlet KJ K, 1, KJ K, 2With silicon controlled rectifier U kTrigger end link to each other; Measurement and control unit MC kBe connected with scheduling controlling chamber DC by measurement and control network DT, k=1,2 ..., N; N is the sum of traction substation.
2. thyristor rectifier tractive power supply system guard method realizes judgement and the excision of short trouble in the thyristor rectifier tractive power supply system that is comprised of traction substation and traction net, it is characterized in that:
Judgement and the cutting method of traction substation dc bus short trouble: traction substation SS kDc bus protective device outlet MJ kDuring the output sub-gate signal, directly make silicon controlled rectifier U kThyristor quit work; Measurement and control unit MC kDc feeder current transformer LH K, 1, LH K, 2Measure greater than 0 and flow into this dc bus B kCalibration with current signal be this dc bus B kShort trouble trend value of symbol=1, greater than 0 and flow out this dc bus B kCalibration with current signal be this dc bus B kShort trouble trend value of symbol=-1, equaling 0 calibration with current signal is this dc bus B kThe unloaded trend value of symbol of short circuit=0, calculate this dc bus B kShort trouble trend value of symbol and the value: if silicon controlled rectifier U kQuit work this dc bus B of rear measurements and calculations of thyristor kShort trouble trend value of symbol with the value more than or equal to 1, then judge this dc bus B kThe permanent earth short trouble occurs, by measurement and control unit MC kThrough measurement and control network DT this fault message is uploaded to scheduling controlling chamber DC, the scheduling controlling chamber DC order completely thyristor of traction substation silicon controlled rectifier quits work, again through measurement and control unit MC kOrder and this dc bus B kThe direct current feed isolating switch QSZ that is connected kWith dc feeder isolating switch QSZ K, 1, QSZ K, 2Separating brake, scheduling controlling chamber DC resumes work through the thyristor of measurement and control network DT order all fronts traction substation silicon controlled rectifier subsequently, and system restores electricity, scheduling controlling chamber DC record: the dc bus B of this traction substation kThe permanent earth short trouble having occured, be isolated, demands urgently getting rid of; If silicon controlled rectifier U kThe thyristor rear measurement and control unit MC that quits work kThrough dc feeder current transformer LH K, 1, LH K, 2This dc bus B of measurements and calculations kShort trouble trend value of symbol with value be 0, showing phylogenetic is transient fault and disappearing, then the out-of-work silicon controlled rectifier U of order kThyristor resume work, normal power supply recovers in system;
The traction substation SS that connects contact line branch road T one end is connected in the judgement of the contact line branch, short-circuit fault of traction net with cutting method kDc feeder failure protecting device outlet output sub-gate signal the time, directly make silicon controlled rectifier U kThyristor quit work, connect the traction substation SS of the contact line branch road T other end K+1Dc feeder failure protecting device outlet output sub-gate signal the time, directly make silicon controlled rectifier U K+1Thyristor quit work; Traction substation SS k(SS K+1) measurement and control unit MC k(MC K+1) to voltage transformer YH k(YH K+1) the silicon controlled rectifier U that measures k(U K+1) the dc bus B of thyristor before and after quitting work k(B K+1) difference of voltage calculates, difference is demarcated greater than 0 and is the port failure voltage sign value of this contact line branch road T=1, it is the port failure voltage sign value of this contact line branch road T=-1 that difference is demarcated less than 0, and it is the port failure voltage sign value of this contact line branch road T=0 that difference equals 0 demarcation; Measurement and control unit MC k(MC K+1) according to rear silicon controlled rectifier U k(U K+1) the voltage transformer YH of thyristor before quitting work k(YH K+1) voltage of measuring and Current calculation short-circuit resistance and the fault point distance of this dc feeder current transformer measurement; Measurement and control unit MC k(MC K+1) through measurement and control network DT port failure voltage sign value is uploaded to scheduling controlling chamber DC, calculate this contact line branch road T port failure voltage sign value and value, minute following A, B, three kinds of situations of C:
If A traction substation SS kSilicon controlled rectifier U kWith traction substation SS K+1Silicon controlled rectifier U K+1Thyristor all quit work and the port failure voltage sign value of this contact line branch road T of calculating and value=2, then judge from traction substation SS kAnd SS K+1This contact line branch road T of seeing into of dc feeder the permanent earth short trouble has all occured, scheduling controlling chamber DC passes down order through measurement and control network DT and makes completely to each measurement and control unit the thyristor of traction substation silicon controlled rectifier all quits work, and makes the dc feeder isolating switch QSZ at the two ends that link to each other with this contact line branch road T again K, 2And QSZ K+1,1Separating brake, the subsequently order completely thyristor of traction substation silicon controlled rectifier is all resumed work, and system restores electricity, scheduling controlling chamber DC record: the permanent earth short trouble has occured in this contact line branch road T, be isolated, demand urgently getting rid of, and show the fault point distance;
If B traction substation SS kSilicon controlled rectifier U kWith traction substation SS K+1Silicon controlled rectifier U K+1Thyristor all quit work and the port failure voltage sign value of this contact line branch road T of calculating with value less than 1, show that phylogenetic is that transient fault also disappears, then the thyristor of the out-of-work relevant traction substation silicon controlled rectifier of order is resumed work, and normal power supply recovers in system;
If C traction substation SS k(SS K+1) silicon controlled rectifier U k(U K+1) thyristor quit work and traction substation SS K+1(SS k) silicon controlled rectifier U K+1(U k) thyristor still the port failure voltage sign value of work and this contact line branch road T of calculating and value=1, illustrate that then this contact line branch road T is from traction substation SS k(SS K+1) end sees into the permanent earth short trouble has occured, and from traction substation SS K+1(SS k) end sees into and occured to open circuit or disconnection fault, scheduling controlling chamber DC through measurement and control network DT pass down order to each measurement and control unit order completely the thyristor of traction substation silicon controlled rectifier quit work, make again traction substation SS k(SS K+1) the dc feeder isolating switch QSZ of an end K, 2(QSZ K+1,1) separating brake, the subsequently order completely thyristor of traction substation silicon controlled rectifier is resumed work, and system restores electricity, scheduling controlling chamber DC record: from traction substation SS k(SS K+1) end sees into that the permanent earth short trouble has occured this contact line branch road T, is isolated, demand urgently getting rid of, from traction substation SS K+1(SS k) this contact line branch road T of seeing into of an end occured to open circuit or disconnection fault, be not isolated, and show the fault point distance; If traction substation SS k(SS K+1) silicon controlled rectifier U k(U K+1) thyristor quit work and traction substation SS K+1(SS k) silicon controlled rectifier U K+1(U k) thyristor still the port failure voltage sign value of work and this contact line branch road T of calculating with value less than 1, show phylogeneticly to be instantaneity earth fault and to disappear, then the out-of-work traction substation SS of order k(SS K+1) silicon controlled rectifier U K+1(U k) thyristor resume work, system restores electricity, scheduling controlling chamber DC record: from traction substation SS K+1(SS k) this contact line branch road T of seeing into of an end occured to open circuit or disconnection fault, demanded urgently processing, and show the fault point distance.
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