CN109728592A - A kind of electric railway traction power supply system - Google Patents
A kind of electric railway traction power supply system Download PDFInfo
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- CN109728592A CN109728592A CN201910149140.8A CN201910149140A CN109728592A CN 109728592 A CN109728592 A CN 109728592A CN 201910149140 A CN201910149140 A CN 201910149140A CN 109728592 A CN109728592 A CN 109728592A
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- 230000005611 electricity Effects 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 5
- 230000003137 locomotive effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 125000002619 bicyclic group Chemical group 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
The invention discloses a kind of electric railway traction power supply systems, belong to railway traction power supply system technical field.The cooperation of tietransformer, three-phase MMC rectifier, single-phase MMC inverter three constitutes center electric substation, the center electric substation takes electricity by tietransformer from three phase network, again by the single-phase AC voltage of the load requirements such as the single phase step-down transformer output power locomotive of identical no-load voltage ratio in the traction substation that is arranged on the way after rectified and inversion；Tietransformer primary side is respectively connected to 110kV three phase network, the exchange side of output termination three-phase MMC rectifier after concatenating respective inductance；The DC side DC output voltage of three-phase MMC rectifier is 160kV, and the single-phase MMC inverter input terminal of access, the output of single-phase MMC inverter is the single phase ac power grid that voltage class is 80kV, the single phase ac power grid is connected with the single phase step-down transformer first winding in each traction substation of Along Railway, and the secondary side output voltage of the single phase step-down transformer is the single-phase alternating current of 27.5kV.
Description
Technical field
The invention belongs to railway traction power supply system technical fields.
Background technique
The current power supply system of China railways belongs to out-phase power supply, and existing tractive power supply system is uneven in order to reduce three-phase
The influence of weighing apparatus, balancing transformer are connected using commutation, cause each power supply segment voltage different in this way, so phase-splitting insulation must be used
Device separates.With the development of high-speed railway, power quality problem, excessively split-phase problem and power supply capacity problem are more and more severeer.
In order to solve the problems, such as above-mentioned traction power supply, there is scholar to propose a kind of cophase supply technology, but the technology can only solve part
Power quality problem, in order to thoroughly solve the problems, such as power quality and excessively equal, the scholar of Southwest Jiaotong University proposes one
The through traction power supply system that kind is made of front end step-down transformer and three-phase-single-phase invertor and output end step-up transformer
System, but this structure makes converter output terminal that need to connect the filter and step-up transformer of large capacity, furthermore there is intermediate ring
The problems such as current is excessive, converter scalability is bad, output voltage control precision is limited are urgently to be resolved.
For traditional two level or three level, multi-level converter output voltage contains close to sine, harmonic wave
Amount is few, and power quality significantly improves.Recently as the proposition of modular multilevel device converter (MMC), in high voltage direct current
The application of electrical domain is got growing concern for, and major advantage includes: that (1) structure is simplified, easy using modular design
In extension, facilitate hoist capacity and voltage class；(2) output level number is more, output voltage waveforms distortion it is small so that harmonic wave compared with
Low, the requirement for filter, which reduces, can even not need filter；(3) each bridge arm is connected by submodule, output level
Between staircase waveform be not much different, du/dt is low, switching loss is small；(4) there is common DC bus, it is big without DC side pressure stabilizing
Capacitor.As can be seen that MMC structure meets the requirement of high-voltage large-capacity tractive power supply system.
In order to solve the problems, such as that current rail tractive power supply system exists and in view of Modular multilevel converter (MMC)
Many advantages, the present invention proposes a kind of novel traction power supply system based on MMC structure, can completely abolish electric split-phase, realizes
Perforation power supply.
Summary of the invention
The object of the present invention is to provide a kind of electric railway traction power supply systems, it can efficiently solve electric railway
The power quality problems such as negative phase-sequence present in power supply, harmonic wave promote tractive power supply system power supply quality and reliability, completely abolish
Electric split-phase realizes perforation power supply.
The purpose of the present invention is be achieved through the following technical solutions: a kind of electric railway traction power supply system, traction
Electric substation and its Traction networks constitute center using the cooperation of tietransformer, three-phase MMC rectifier, single-phase MMC inverter three
Electric substation, which is equipped with the single-phase MMC converter of three-phase-, and electricity is taken from three phase network by tietransformer, passes through
Again by the single phase step-down transformer output power locomotive etc. of identical no-load voltage ratio in the traction substation that is arranged on the way after rectification and inversion
The single-phase AC voltage of load requirement；Specific connecting mode are as follows: tietransformer primary side concatenates respective inductance La、Lb、LcAfter divide
Not Jie Ru 110kV power supply network a, b, c three phase network, output termination three-phase MMC rectifier exchange side；Three-phase MMC rectification
The DC side DC output voltage of device is 160kV, and accesses single-phase MMC inverter input terminal, and the output of single-phase MMC inverter is electricity
Pressing grade is the single phase ac power grid of 80kV, the phase buck in the single phase ac power grid and each traction substation of Along Railway
Transformer first winding is connected, and the secondary side output voltage of the single phase step-down transformer is the single-phase alternating current of 27.5kV, institute
Stating single phase ac electrical connection railway traction net is train power supply.
The single-phase MMC converter of three-phase-is made of three-phase MMC rectifier and single-phase MMC inverter.
The single-phase MMC converter of three-phase-uses submodule overlaying structure:
A. the submodule is all made of half-bridge structure, and each submodule uses two pressure resistances for the IGBT pipe of 3300V；
B. each mutually upper and lower half bridge arm submodule number mesh of the single-phase MMC converter of three-phase-is set as 80 according to substation capacity
It is a；
C. the single-phase MMC converter of three-phase-is using single inductor filter.
The three-phase MMC rectifier passes through acquisition three-phase electricity voltage on line side uva、uvb、uvcWith electric current iva、ivb、ivcAnd it is straight
Flow lateral capacitance voltage udcWith each submodule capacitor voltage value, then using open sea wharf, inner ring current control it is bicyclic
The switch on and off that the method combined with dq decoupling control generates PWM drive signal control three-phase MMC rectifier is controlled, to make
It obtains DC side DC and exports 160kV；
The single-phase MMC inverter, by acquiring single-phase inversion side output voltage V0And submodule capacitor voltage, using straight
It connects voltage control and approaches the switch on and off that modulation generation PWM drive signal controls single-phase MMC inverter with nearest level, so that friendship
It flows side and exports 80kV.
The tractive power supply system for comparing and being referred in background technique, a kind of electric railway traction confession proposed by the present invention
Electric system, main advantage are:
(1) output level number is more, smaller for the stress of devices switch, exports the of less demanding of filtering；
(2) modular design can carry out dilatation according to the capacity of electric substation；
(3) DC side bulky capacitor is eliminated；
(4) it can provide phase-amplitude consistent single-phase alternating current for multiple electric substations simultaneously, and circulation very little between institute,
Power flowcontrol is simple.
Detailed description of the invention
Fig. 1 is the tractive power supply system structure chart the present invention is based on MMC structure.
Fig. 2 is the single-phase MMC inverter main circuit topological diagram of three-phase-of the present invention.
Fig. 3 is three-phase MMC rectifier current control block diagram of the present invention.
Fig. 4 is the single-phase MMC inverter voltage control block diagram of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of electric railway traction power supply system proposed by the present invention, including tietransformer 1, three-phase MMC be whole
Flow device 2, single-phase MMC inverter 3, traction substation single phase step-down transformer 4, railway traction net 5.Three-phase MMC rectifier 2 passes through
Tietransformer 1 is respectively connected to a, b, c three-phase of three-phase 110kV power grid, and output DC voltage DC is 160kV, DC voltage with
Single-phase MMC inverter 3 is connected, the High-Voltage Network and each traction substation SS of Along Railway that output single-phase alternating current 80kV is formed1、
SS2、…、SSnIn 4 first winding of step-down transformer be connected, 4 secondary side of step-down transformer export 27.5kV single-phase alternating current,
Single phase ac is electrically connected railway traction net 5.
Three-phase MMC rectifier 2 and single-phase MMC inverter 3 constitute the single-phase MMC converter of three-phase-, the connection of three phase network access
It ties transformer and the single-phase MMC of three-phase-constitutes center electric substation 6,6 output end of center electric substation and each traction substation along the line
The connection of 4 primary side of single phase step-down transformer, the single phase step-down transformer 4 exports the single-phase alternating current of the load requirements such as locomotive
Pressure.Wherein the single-phase MMC structure main circuit topology of three-phase-is as shown in Fig. 2, be used to net side three-phase voltage uva、uvb、uvcIt is converted to
Single-phase AC voltage.Submodule SM1, SM2 ..., SMn be all made of half-bridge structure, each submodule uses two pressure resistances for 3300V
IGBT pipe, every mutually upper and lower half bridge arm connects a bridge arm reactor L0.The DC link voltage DC of design is
160kV considers that IGBT voltage margin is 1.65 times, then each mutually upper and lower half bridge arm of the single-phase MMC converter of the three-phase-of this structure
Number of modules is 80.Due to including capacitor in each submodule, intermediate dc side no longer needs bulky capacitor.The transformation simultaneously
The voltage level number of device output is high, and the single-phase MMC converter output of the three-phase-of this structure is using single inductance LtFiltering.
Due to being designed using modular so that power system capacity gets a promotion.In order to match supply conductor voltage, need every
A traction substation configures the single phase step-down transformer of identical no-load voltage ratio.Since power system capacity is sufficiently large, and each traction substation
Receiving end voltage it is identical, so the system can for along multiple traction substations provide amplitude, phase, frequency identical electricity
Pressure.
Tractive power supply system each section proposed by the present invention is illustrated respectively below:
One, tietransformer
Tietransformer be three phase network Yu the single-phase MMC converter of three-phase-connection tie, effect be embodied in:
1. realizing the matching of three-phase power grid voltage and MMC converter DC voltage；
2. realizing the electrical isolation between three phase network and MMC converter；
3. playing the role of linked reactor, being used to smooth waveform and inhibiting fault current.
According to exchanging watt level and determine the capacity of tietransformer between MMC converter and three phase network, due to
Transformer itself to consume it is certain idle, so the capacity of tietransformer is usually the 1.1 to 1.2 of MMC converter capacity
Times.The winding connecting mode of tietransformer uses the star-like ground connection of net side, no-load voltage ratio 110kV/110kV in the present invention.
Two, three-phase MMC rectifier
Fig. 3 is three-phase MMC rectifier Direct Current Control block diagram, first acquisition three-phase electricity voltage on line side uva、uvb、uvcWith
Electric current iva、ivb、ivcWith DC capacitor voltage udcAnd each submodule capacitor voltage value, using open sea wharf, inner ring
The method that the double -loop control of current control is combined with dq decoupling control.On the one hand outer ring active power controller, i.e. power are used
Outer ring controller is by DC capacitor voltage actual value udcWith given value u* dcThe d axis making difference and being needed by PI controller
Reference quantity i* vd, in order to enable converter work is in unity power factor, usually given q axis reference quantity i* vqIt is zero；On the other hand
Using inner ring current control, i.e. ac-side current obtains DC component i through abc-dq coordinate transform under dq coordinatedAnd iq, then lead to
Low-pass filter LPF filtering is crossed, the active reactive DC component i without harmonic wave is obtainedvdAnd ivq。ivdWith its reference quantity i* vdIt is poor to make
By PI controller, in conjunction with active component u of the three-phase mains voltage under dq coordinatesdWith the idle DC component for being free of harmonic wave
ivq, the d axis component u of the reference value of the control amount differential mode voltage needed* diffd；ivqWith its reference quantity i* vqThrough PI after work difference
Controller, in conjunction with reactive component u of the three-phase mains voltage under dq coordinatesqWith the active DC component i for being free of harmonic wavevd, obtain
To the q axis component u of the reference value of the control amount differential mode voltage of needs* diffq。u* diffdAnd u* diffqBy in dq-abc coordinate transform
It is converted to the reference quantity u of three-phasefabc, modulated through phase-shifting carrier wave generate PWM drive signal control three-phase MMC rectifier switch it is logical
It is disconnected, so that DC side exports 160kV.The sine of voltage phase angle needed for coordinate transform, cosine value sin φ in controla、
cosφaIt is obtained with the product ω t of electrical network angular frequency and time by phase-locked loop pll.
Three, three-phase MMC inverter
Fig. 4 is single-phase MMC inverter direct voltage control block diagram, acquires output voltage actual value V in exchange side first0Through
There is virtual value computing module RMS to obtain its virtual value V0rms, virtual value is given into reference value V0refWith V0rmsIt makes comparisons, is controlled through PI
Device processed enables output voltage to track virtual value.PI controller exports VinBe multiplied conduct with three phase network lockin signal-cos φ
The upper and lower n submodule SM1, SM2 of bridge arm of converter a phase ..., the output pulse-modulated signal of SMn controlled, PI controller
Export VinBe multiplied with power grid lockin signal cos φ as converter b phase upper and lower n submodule SM1, SM2 of bridge arm ..., SMn
Output pulse-modulated signal is controlled, and is approached modulation (NLM) by nearest level and is obtained the switching signal of each module, quickly
The output voltage for adjusting inverter, makes its final fast and stable in given value.
Four, traction substation single phase step-down transformer
In view of the modulation degree of inversion output, so the present invention considers design in single phase ac side by output voltage peak value control
For system in 110kV, i.e. transformer primary side virtual value is about 80kV.Therefore three phase network forms voltage class after " center electric substation "
For the single phase ac power grid of 80kV, to be 27.5kV to voltage class, the railway traction net that frequency is 50Hz is powered, and the present invention needs
The single-phase doublewound power frequency step-down transformer that no-load voltage ratio is 80kV/27.5kV is configured for each electric substation.
Since the capacity of traction substation is 20MW to 55MW or so, it is contemplated that maximum capacity situation and idle disappearing
Consumption problem, the capacity that the present invention designs single-phase doublewound power frequency step-down transformer is 60MW.The transformer on the one hand provide with
On the one hand the identical voltage of supply conductor voltage grade makes have electrical isolation between Traction networks and main circuit, prevents in failure
Too big dash current only is generated to main circuit and damages element.
Claims (5)
1. a kind of electric railway traction power supply system, including traction substation and its Traction networks (5), it is characterised in that:
Center power transformation is constituted using the cooperation of tietransformer (1), three-phase MMC rectifier (2), single-phase MMC inverter (3) three
Institute (6), which is equipped with the single-phase MMC converter of three-phase-, and is taken from three phase network by tietransformer (1)
Electricity, the traction substation (SS by being arranged on the way again after rectified and inversion1、SS2、…、SSn) in identical no-load voltage ratio phase buck
The single-phase AC voltage of the load requirements such as transformer (4) output power locomotive；Specific connecting mode are as follows: tietransformer (1) is former
Side concatenates respective inductance La、Lb、LcIt is respectively connected to a, b, c three phase network of 110kV power supply network, output termination three-phase MMC afterwards
The exchange side of rectifier (2)；The DC side DC output voltage of three-phase MMC rectifier (2) is 160kV, and accesses single-phase MMC inversion
Device (3) input terminal, the output of single-phase MMC inverter (3) are the single phase ac power grid that voltage class is 80kV, the single-phase alternating current
Net and each traction substation (SS of Along Railway1、SS2、…、SSn) in single phase step-down transformer (4) first winding be connected, institute
The secondary side output voltage for stating single phase step-down transformer (4) is the single-phase alternating current of 27.5kV, and the single phase ac is electrically connected iron
Road Traction networks (5) are train power supply.
2. a kind of electric railway traction power supply system according to claim 1, it is characterised in that: the three-phase-is single-phase
MMC converter is made of three-phase MMC rectifier (2) and single-phase MMC inverter (3).
3. a kind of electric railway traction power supply system according to claim 1, it is characterised in that: the three-phase-is single-phase
MMC converter uses submodule overlaying structure:
A. the submodule is all made of half-bridge structure, and each submodule uses two pressure resistances for the IGBT pipe of 3300V；
B. each mutually upper and lower half bridge arm submodule number mesh of the single-phase MMC converter of three-phase-is set as 80 according to substation capacity；
C. the single-phase MMC converter of three-phase-is using single inductor filter.
4. a kind of electric railway traction power supply system according to claim 1, it is characterised in that: the three-phase MMC is whole
It flows device (2) and passes through acquisition three-phase electricity voltage on line side uva、uvb、uvcWith electric current iva、ivb、ivcAnd DC capacitor voltage udcWith it is each
A sub- module capacitance voltage value, then using open sea wharf, bicyclic control and the dq decoupling control phase of inner ring current control
In conjunction with method generate PWM drive signal control three-phase MMC rectifier (2) switch on and off so that DC side DC export
160kV；
5. a kind of electric railway traction power supply system according to claim 1, it is characterised in that: the single-phase MMC is inverse
Become device (3), by acquiring single-phase inversion side output voltage V0And submodule capacitor voltage, it is using direct voltage control and electric recently
The flat switch on and off for approaching modulation and generating the single-phase MMC inverter (3) of PWM drive signal control, so that exchange side exports 80kV.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165906A (en) * | 2019-06-18 | 2019-08-23 | 西南交通大学 | A kind of electric power electric transformer |
| CN110341728A (en) * | 2019-08-19 | 2019-10-18 | 西南交通大学 | A kind of through tractive power supply system of electric railway |
| CN111446867A (en) * | 2019-12-30 | 2020-07-24 | 中铁电气化局集团有限公司 | Through in-phase traction power supply system based on four-port modular multilevel converter |
| CN111446866A (en) * | 2019-12-30 | 2020-07-24 | 中铁电气化局集团有限公司 | Through same-phase traction power supply system based on balancing transformer and four-port MMC |
| CN111697598A (en) * | 2020-05-19 | 2020-09-22 | 国网湖南省电力有限公司 | Mode switching system and mode switching method for electrified railway |
| CN111711353A (en) * | 2020-06-17 | 2020-09-25 | 中国国家铁路集团有限公司 | Reactive component detection method, control method and device of single-phase rectifier |
| CN113224762A (en) * | 2021-05-28 | 2021-08-06 | 西南交通大学 | Long-distance through flexible traction power supply system and optimization control method thereof |
| CN114421457A (en) * | 2021-12-21 | 2022-04-29 | 西南交通大学 | Through flexible traction substation based on high step-down ratio transformer |
| CN114906015A (en) * | 2022-04-21 | 2022-08-16 | 西南交通大学 | Alternating current-direct current traction power supply structure and control method for electrified railway |
| CN110165906B (en) * | 2019-06-18 | 2024-04-30 | 西南交通大学 | Power electronic transformer |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165906A (en) * | 2019-06-18 | 2019-08-23 | 西南交通大学 | A kind of electric power electric transformer |
| CN110165906B (en) * | 2019-06-18 | 2024-04-30 | 西南交通大学 | Power electronic transformer |
| CN110341728B (en) * | 2019-08-19 | 2024-01-26 | 西南交通大学 | Electrified railway through-type traction power supply system |
| CN110341728A (en) * | 2019-08-19 | 2019-10-18 | 西南交通大学 | A kind of through tractive power supply system of electric railway |
| CN111446867A (en) * | 2019-12-30 | 2020-07-24 | 中铁电气化局集团有限公司 | Through in-phase traction power supply system based on four-port modular multilevel converter |
| CN111446866A (en) * | 2019-12-30 | 2020-07-24 | 中铁电气化局集团有限公司 | Through same-phase traction power supply system based on balancing transformer and four-port MMC |
| CN111446867B (en) * | 2019-12-30 | 2021-05-28 | 中铁电气化局集团有限公司 | Through in-phase traction power supply system based on four-port modular multilevel converter |
| CN111446866B (en) * | 2019-12-30 | 2021-05-28 | 中铁电气化局集团有限公司 | Through same-phase traction power supply system based on balancing transformer and four-port MMC |
| WO2021196448A1 (en) * | 2019-12-30 | 2021-10-07 | 中铁电气化局集团有限公司 | Interconnected co-phase traction power supply system based on four-port modular multilevel converter |
| CN111697598A (en) * | 2020-05-19 | 2020-09-22 | 国网湖南省电力有限公司 | Mode switching system and mode switching method for electrified railway |
| CN111697598B (en) * | 2020-05-19 | 2021-12-17 | 国网湖南省电力有限公司 | Mode switching system and mode switching method for electrified railway |
| CN111711353A (en) * | 2020-06-17 | 2020-09-25 | 中国国家铁路集团有限公司 | Reactive component detection method, control method and device of single-phase rectifier |
| CN113224762A (en) * | 2021-05-28 | 2021-08-06 | 西南交通大学 | Long-distance through flexible traction power supply system and optimization control method thereof |
| CN113224762B (en) * | 2021-05-28 | 2022-05-10 | 西南交通大学 | Long-distance through flexible traction power supply system and optimization control method thereof |
| CN114421457A (en) * | 2021-12-21 | 2022-04-29 | 西南交通大学 | Through flexible traction substation based on high step-down ratio transformer |
| CN114906015A (en) * | 2022-04-21 | 2022-08-16 | 西南交通大学 | Alternating current-direct current traction power supply structure and control method for electrified railway |
| CN114906015B (en) * | 2022-04-21 | 2023-04-07 | 西南交通大学 | Alternating current-direct current traction power supply structure and control method for electrified railway |
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