CN103552487B - A kind of cophase supply device and tractive power supply system - Google Patents
A kind of cophase supply device and tractive power supply system Download PDFInfo
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- CN103552487B CN103552487B CN201310487237.2A CN201310487237A CN103552487B CN 103552487 B CN103552487 B CN 103552487B CN 201310487237 A CN201310487237 A CN 201310487237A CN 103552487 B CN103552487 B CN 103552487B
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Abstract
The invention discloses a kind of cophase supply device and tractive power supply system, it comprises a MMC converter valve, its one end couples traction transformer first feeding section, and the other end connects return wire, for the alternating-current voltage/AC voltage of traction transformer first feeding section is transformed to vdc; 2nd MMC converter valve, its one end couples traction transformer second feeding section, and the other end connects return wire, for by the vdc inversion of a MMC converter valve transmission being and the second feeding section amplitude of traction transformer and the on all four alternating-current voltage/AC voltage of phase place.Utilize traction transformer time two, limit feeding section to gain merit the mutual biography of energy, eliminate negative phase sequence current, and the capacity utilization of traction transformer is maximized, the electric phase-splitting of elimination Traction networks; Utilize MMC converter valve to compensate reactive volt-amperes and the harmonic wave of two feeding sections, avoid and increase the device such as electric capacity, SVC and SVG and the excessive risk of harmonic wave, thus for the comprehensive regulation of the traction transformer quality of power supply.
Description
Technical field
The present invention relates to electric power system, particularly relate to a kind of cophase supply device and tractive power supply system.
Background technology
The electrified railway overwhelming majority adopts ac power supply system in the world at present, and wherein electric system provides the three-phase high-voltage power supply of 110kV/220kV, and its capacity is general comparatively large, can bear larger breaking current and harmonic current.The Alternating Current Power Supply standard of current I EC standard and national regulations is 27.5kV, 50Hz.Because electric locomotive adopts single phase power supply, therefore the more high-grade 110kV/220kV voltage provided from electric system must be transformed to single-phase 27.5kV voltage supply electric locomotive through substation.
As shown in Figure 1, in traditional tractive power supply system, substation utilizes traction transformer that the high-voltage ac power of 110kV/220kV electricity is converted to the two-phase low potential source of 27.5kV, 27.5kV voltage is connected in the middle of traction contact system by voltage transformer time lateral dominance feedback line, through Traction networks wire, pantograph access train, and form a complete loop through rail and return wire.But there is following problem in traditional tractive power supply system:
1, complete former limit three-phase high-voltage alternating-current voltage/AC voltage to time conversion of limit two-phase AC low-tension by traction transformer, due to the non-three-phase symmetrical on secondary limit, cause the primary current asymmetrical three-phase (namely there is negative-sequence current) of traction transformer.
2, the voltage magnitude of usual two adjacent feeding sections and phase place inconsistent, cause point electricity mutually or the appearance of non-electricity zone, and then affect the running velocity of train, the comfort level of passenger is affected, and undue electricity also can produce over voltage mutually and burn the danger of netting in addition.
3, because drawing electric network does not tackle the measure of harmonic wave, if harmonic wave is excessive, the generation of the phenomenons such as Traction networks resonance, voltage fluctuation, electric capacity bulge and transformer loss may just be caused.
4, in tradition tractive power supply system, the power factor of each feeding section (in Fig. 1 α and β feeding section) is decided by the load (i.e. locomotive) of this feeding section, the alternating current electric locomotive that power factor is higher makes the power factor of this feeding section also higher, and the lower DC locomotive of power factor makes this feeding section power factor very low, in order to prevent, power factor is too low causes fine, tradition electric power system installs fixed capacity at each feeder line of substation usually, SVC SVC or static reacance generator SVG device come compensating power and low-order harmonic, and two feeding sections just need two covering devices, add system operation cost.
By Zhuzhou National Engineering Research Center of Converters Co., Ltd., apply on September 27th, 2012, and it is open on January 30th, 2013, publication number is the Chinese invention patent application of CN102904271A, " a kind of traction contact system " discloses the traction contact system of the many level of a kind of application moduleization (ModularMultilevelConverter is called for short MMC) technology.This system is directly connected with electric system by the current transformer based on MMC, the three phase current that electric system exports is carried out rectification and obtains commutating voltage, then by direct current (DC) by the inversion of two-phase MMC current transformer, obtains single phase alternating current, power to locomotive load.This patent can ensure that three-phase power balances, and reduces energy loss.But this patent directly instead of traditional traction transformer with the power electronic equipment based on MMC, the reliability of power electronic equipment just seems particularly important, once power electronic equipment breaks down, whole tractive power supply system will be paralysed, this is concerning the very high railway power system of security requirement, and this risk is difficult to bear.
By Southwest Jiaotong University, apply on October 22nd, 2007, and it is open on June 25th, 2008, publication number is the Chinese invention patent application of CN201077368, " a kind of electrified railroad homo-phase traction power supply system " discloses a kind of electric railway cophase supply system, the traction transformer of this system adopts three former limit A of YNd11 connection, B, C tri-connects high pressure utility network, flow controller is connected between this voltage transformer d connection low pressure side terminal, and terminal a, b connects electric railway and connects high pressure common network, flow controller is connected between this voltage transformer d connection low pressure side terminal, and terminal a, b connects contact nets in electrified railways.This system can realize railway cophase supply completely and without the need to phase-splitting, and power supply is stable, ensures high speed, the heavy service of locomotive; Meanwhile, this system can eliminate rail traction load to the negative phase-sequence of shared electrical network electric energy, reactive volt-amperes and harmonic effects.But this patent does not relate to MMC direct hanging type topological structure.
By Southwest Jiaotong University, apply on March 15th, 2010, and it is open on June 23rd, 2010, publication number is the Chinese invention patent application of CN101746283A, " a kind of electrified railroad homo-phase traction power supply system " discloses a kind of electrified railroad homo-phase traction power supply system, the traction transformer of its traction substation is three-phase-two phase transformer, the former limit three-phase of traction transformer is connected with utility network, and the α on secondary limit exports mutually and be connected with step-down transformer, single-phase converter, DC capacitor and single-phase converter in turn between β output mutually; α phase is locomotive power supply, and its output voltage is 27.5kV; The output voltage of β phase is 600-2000V.This system can realize the two-arm cophase supply of rail traction substation and without the need to phase-splitting, decrease phase-splitting link, is conducive to the high speed of railway, safety and steady runs; And this system architecture is simple, cost is low, is convenient to implement.But this patent adopts two level current transformers of multiplex, in the larger situation of capacity, the capacity of step-down transformer is very large, and current transformer branch road is also very many, this adds increased equipment cost, improves the technical risk of current transformer.
Summary of the invention
For the problems referred to above, the invention provides the cophase supply device in a kind of tractive power supply system, it comprises:
One MMC converter valve, its one end couples traction transformer first feeding section, and the other end connects return wire, and a described MMC converter valve is used for the alternating-current voltage/AC voltage of traction transformer first feeding section to be transformed to vdc;
2nd MMC converter valve, its one end couples traction transformer second feeding section, the other end connects return wire, and the vdc inversion that described 2nd MMC converter valve is used for a described MMC converter valve is transmitted is and the second feeding section amplitude of traction transformer and the on all four alternating-current voltage/AC voltage of phase place.
According to one embodiment of present invention, a described MMC converter valve and described 2nd MMC converter valve comprise 2 facies units, and the mid point of facies unit connects feeding section and the return wire of traction transformer respectively.
According to one embodiment of present invention, described facies unit comprises upper and lower two brachium pontis, and described brachium pontis comprises:
N submodule SM of cascade;
Reactor, and is connected on the n-th submodule SM, for providing circulation impedance to limit alternate circulation.
According to one embodiment of present invention, the rated value of described n submodule SM is all identical, and the reactance value of described reactor is identical.
According to one embodiment of present invention, the submodule SM number that described two facies units are identical may be used for the stable of vdc between a described MMC converter valve and described 2nd MMC converter valve.
According to one embodiment of present invention, the alternating-current voltage/AC voltage of the output of described tractive power supply system is regulated and controled by the quantity of the submodule SM of the state of dropping into.
According to one embodiment of present invention, the level number of the output of described tractive power supply system is regulated and controled by the submodule SM quantity of the state of dropping into.
According to one embodiment of present invention, described submodule SM comprises the DC energy storage electric capacity of IGBT half-bridge circuit or full-bridge circuit and parallel connection with it.
According to one embodiment of present invention, between the DC side of each full-bridge submodule SM of a described MMC converter valve and described 2nd MMC converter valve, increase two-way high frequency DC-DC converter successively, wherein said DC-DC converter is with high-frequency transformer.
According to another aspect of the present invention, additionally provide a kind of tractive power supply system, it adopts above-mentioned cophase supply device with on the direct screening topology mode feeding section that is connected to the traction transformer of electrical network and return wire.
Compared with prior art, the beneficial effect that the present invention brings is:
1, utilize cophase supply device provided by the invention and tractive power supply system that feeding section energy of gaining merit in traction transformer time two, limit is passed mutually, eliminate negative phase sequence current for transformer primary side three-phase equilibrium.
2, solve the voltage magnitude of two adjacent feeding sections and the inconsistent problem of phase place, avoid two feeding sections cause affecting the speed of train, over voltage and burn net danger because adopting electric phase-splitting or non-electricity zone to carry out isolating.
3, MMC converter valve is utilized to compensate reactive volt-amperes and the harmonic wave of two feeding sections, avoid and increase the device such as extra fixed capacity, SVC and SVG and the excessive risk of harmonic wave, and the capacity utilization of traction transformer is maximized, thus realize the comprehensive regulation of the traction transformer quality of power supply, be a kind of novel actv. tractive power supply system.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, with embodiments of the invention jointly for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is traditional tractive power supply system principle schematic;
Fig. 2 is cophase supply device of the present invention and tractive power supply system principle schematic;
Fig. 3 is the converter valve of MMC shown in Fig. 2 inner structure schematic diagram;
Fig. 4 is the inner structure schematic diagram of the converter valve of MMC shown in Fig. 3 submodule (Submodule is called for short SM);
Fig. 5 is H bridge cascade structure converter valve inner structure schematic diagram.
Detailed description of the invention
Describe embodiments of the present invention in detail below in conjunction with drawings and Examples, whereby to the present invention's how application engineering means technical solution problem, and the implementation procedure reaching technique effect fully understands and implements according to this.It should be noted that, only otherwise form conflict, the feature in the present invention in each embodiment and each embodiment can be combined with each other, formed technical scheme all within protection scope of the present invention.
As shown in Figure 2, that cophase supply device provided by the invention and tractive power supply system form structure and connection diagram, electric system provides 110kV/220kV voltage source, 27.5kV/55kV power supply is converted to by traction transformer 10, convert through tractive power supply system 20, export the single phase poaer supply needed for locomotive 50.Tractive power supply system 20 of the present invention adopts the project organization of " dos-à-dos " direct screening topology, and it comprises:
MMC converter valve 30, its one end couples the β feeding section of traction transformer 10, and the other end connects return wire, is transformed to vdc for the alternating-current voltage/AC voltage exported by traction transformer 10 β feeding section.
MMC converter valve 40, its one end couples the α feeding section of traction transformer 10, and the other end connects return wire, for the vdc inversion described MMC converter valve 30 transmitted is and α feeding section amplitude and the on all four alternating-current voltage/AC voltage of phase place.
The voltage magnitude exported due to α feeding section and the β feeding section of now traction transformer 10 and phase place completely the same, just directly can be connected without the need to any point of electric phase device, therefore export for homophase under the prerequisite not changing traction transformer 10 capacity.In addition, owing to arbitrarily can regulate according to load and control algorithm through the energy of cophase supply device transfer transfer.According to traditional tractive power supply system groundwork, when the load current size of traction transformer time two feeding sections in limit is identical, power factor is consistent, the three phase current on the former limit of traction transformer by complete equilibrium, thus realizes the elimination of transformer primary side negative-sequence current.Namely cophase supply device is utilized, completely the same through reconciling traction transformer time two, limit feeding section electric current, can eliminating transformer former limit negative-sequence current.
Current current transformer is connected in parallel on high-voltage fence and mainly contains two kinds of modes, and wherein a kind of mode is based on transformer isolation type multiplex converter device, and another kind of mode is novel transless cascade multi-level converter.Front a kind of mode may be used for balanced three-phase voltage based on transformer isolation type multiplex converter device, improves traction power supply net power factor.But high for voltage class, the application scenario that capacity is larger, low pressure side needs current transformer tuple in parallel very many, and the capacity of step-down transformer is also very large, the cost of this difficulty controlled by increase current transformer and equipment.The novel transless cascade multi-level converter of rear a kind of mode, the direct hanging type MMC current transformer namely in the present invention, it has the modular advantage of cascade structure, realizes many level export by the cascade of power cell.Each power cell is made up of two level half-bridges, and all electric capacity is in suspended state.When adopting " dos-à-dos " structure, being easy to realize four quadrant running, the transfer realizing energy can be easier to.And often an increase level only needs increase modular unit, is easy to expand to high level.Relative to transformer isolation type multiplex current transformer, direct hanging type MMC is more suitable for high voltage large capcity occasion, and the cost that current transformer controls difficulty and equipment is all very low.
As shown in Figure 3, MMC converter valve 30 and MMC converter valve 40 inner structure schematic diagram in Fig. 2 cophase supply device 20 of the present invention, it should be noted that MMC converter valve 30 is identical with MMC converter valve 40 inner structure, as long as namely MMC converter valve 40 is oppositely entered the function that just can realize MMC converter valve 30 AC-DC from a, b termination, MMC converter valve 30 is oppositely connect and namely enters the function that also can realize MMC converter valve 40 AC-DC from P, N termination, so the present invention only carrys out casehistory with MMC converter valve 40.
MMC converter valve 40 comprises: 2 facies units, 41,4 brachium pontis 42 and multiple submodule SM43.Wherein 1 facies unit 41 comprises upper and lower two brachium pontis 42, and by a reactor 44 and n SM half-bridge submodule 43(namely each brachium pontis 42 comprises: SM1, SM2 ... SMn) be in series.L in each reactor 44(figure in 4 brachium pontis 42
1, L
2, L
3and L
4) reactance value identical, the Main Function of reactor 44 is to provide circulation impedance to limit the size of alternate circulation.
MMC converter valve 40 has the effect of stable DC voltage, vdc is provided by two facies units 41 in parallel each other, make DC voltage stability, require that the submodule SM43 number being in input state in two facies units 41 is all equal and constant, wherein each facies unit 41 drops into the submodule SM43 number of state is n, is the half of the whole submodule SM43 number 2n of this facies unit 41.
The all right regulation output alternating-current voltage/AC voltage of MMC converter valve 40, because the submodule SM43 number being in input state in each facies unit 41 is a definite value, so can be carried out between the upper and lower brachium pontis of this facies unit 41 by the submodule SM43 being in input state in each facies unit 41 point being used in the adjustment of holding alternating-current voltage/AC voltage to export to a, b.
The level number that MMC converter valve 40 exports can change, and the submodule SM43 number being in input state in single brachium pontis 42 can be 0,1 ... n, the level number that namely the most multipotency of MMC converter valve 40 exports is n+1.The submodule SM43 number n that a usual brachium pontis 42 contains is even number, like this when the individual in running order submodule SM43 of n is in upper and lower brachium pontis 42 mean allocation of this facies unit 41, the submodule SM43 number being then in input state in upper and lower brachium pontis 42 is equal, and be all n/2, this facies unit 41 output voltage is zero level.
MMC converter valve 40 may be used for the function of MMC converter valve 30 through reversal connection, and MMC converter valve 40 holds input DC power by P, N, after MMC converter valve 40 converts, hold output AC electricity by a, b; Hold input AC electricity to hold at P, N after MMC converter valve 40 converts by a, b when oppositely connecing to export direct current (DC), may be used for the function of MMC converter valve 30.
As shown in Figure 4, be the inner structure schematic diagram of Fig. 3 MMC converter valve 40 of the present invention Neutron module SM43, its submodule SM43 comprises: insulated gate bipolar transistor IGBT half-bridge 45 and DC energy storage electric capacity C45 are formed in parallel, and submodule SM43 is by the series connection brachium pontis that goes between.Wherein IGBT half-bridge 45 comprises igbt chip T1, T2 and sustained diode 1, D2.
The above, be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto.
Adopt MMC converter valve for the transfer of energy in electric power system of the present invention; the mode of MMC converter valve is not described in detail in the present invention; as long as adopt the connection mode of MMC converter valve described in the invention; no matter adopt which kind of MMC converter valve mode, all in the scope that the present invention protects.
According to another embodiment of the invention, H bridge cascade structure as shown in Figure 5 also can be applied in cophase supply device of the present invention, and the DC side of each H bridge module generally adopts phase shift isolating transformer step-down rectifier.If save phase shifting transformer and directly adopt back-to-back structure, each DC bus may produce the interconnected of different modes in rectification side and inverter side, easily causes dc-link capacitance to be short-circuited.A solution is exactly between the H bridge power unit DC bus and the H bridge power unit DC bus of inversion of rectification, increase the two-way high frequency DC-DC converter having high-frequency transformer.Because the iron core of high-frequency transformer is little, power density is large, and the volume of whole changer can be reduced.
In sum, any those skilled in the art are in the technical scope disclosed by the present invention, and the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. the cophase supply device in tractive power supply system, is characterized in that, comprising:
One MMC converter valve, its one end couples traction transformer first feeding section, and the other end connects return wire, and a described MMC converter valve is used for the alternating-current voltage/AC voltage of traction transformer first feeding section to be transformed to vdc;
2nd MMC converter valve, its one end couples traction transformer second feeding section, and the other end connects return wire, for by the vdc inversion of a described MMC converter valve transmission being and the second feeding section amplitude of traction transformer and the on all four alternating-current voltage/AC voltage of phase place.
2. cophase supply device as claimed in claim 1, it is characterized in that, a described MMC converter valve and described 2nd MMC converter valve comprise two facies units, and the mid point of facies unit connects feeding section and the return wire of traction transformer respectively.
3. cophase supply device as claimed in claim 2, it is characterized in that, described facies unit comprises upper and lower two brachium pontis, and described brachium pontis comprises:
N submodule SM of cascade;
Reactor, it is connected on the n-th submodule SM, for providing circulation impedance to limit alternate circulation.
4. cophase supply device as claimed in claim 3, it is characterized in that, the rated value of described n submodule SM is all identical, and the reactance value of described reactor is identical.
5. the cophase supply device according to any one of claim 2-4, is characterized in that, the submodule SM number that described two facies units are identical may be used for the stable of vdc between a described MMC converter valve and described 2nd MMC converter valve.
6. the cophase supply device as described in claim 1 or 4, is characterized in that, the alternating-current voltage/AC voltage of the output of described tractive power supply system is regulated and controled by the quantity of the submodule SM of the state of dropping into.
7. the cophase supply device as described in claim 1 or 4, is characterized in that, the level number of the output of described tractive power supply system is regulated and controled by the submodule SM quantity of the state of dropping into.
8. cophase supply device as claimed in claim 3, is characterized in that, described submodule SM comprises the DC energy storage electric capacity of IGBT half-bridge circuit or full-bridge circuit and parallel connection with it.
9. cophase supply device as claimed in claim 8, it is characterized in that, between a described MMC converter valve and the DC side of described 2nd MMC converter valve, increase two-way high frequency DC-DC converter, wherein said DC-DC converter is with isolating transformer.
10. one kind adopts the tractive power supply system of cophase supply device as claimed in any one of claims 1-9 wherein.
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| CN104022630B (en) * | 2014-04-29 | 2015-12-02 | 株洲变流技术国家工程研究中心有限公司 | A kind of multi-functional mixed type tractive power supply system and control method |
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| CN106379200B (en) * | 2016-09-28 | 2018-06-19 | 西南交通大学 | A kind of cophase supply system based on Vx tractive transformers |
| CN106452099A (en) * | 2016-10-10 | 2017-02-22 | 中国矿业大学(北京) | Novel connection method of three-phase cascade convertor and working mode during power supply or load fault |
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