CN109484254A - A kind of power supply topological structure and control method for crossing split-phase for high speed rail system - Google Patents
A kind of power supply topological structure and control method for crossing split-phase for high speed rail system Download PDFInfo
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- CN109484254A CN109484254A CN201811472571.XA CN201811472571A CN109484254A CN 109484254 A CN109484254 A CN 109484254A CN 201811472571 A CN201811472571 A CN 201811472571A CN 109484254 A CN109484254 A CN 109484254A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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Abstract
The invention belongs to power electronic technique, and in particular to a kind of power supply topological structure and control method that split-phase is crossed for high speed rail system.It includes u that this, which crosses split-phase power supply topological structure, v, and device module branch and capacitive branch are moved in the more level changes of current of w three-phase, u, v, in parallel with capacitive branch after w three-phase multilevel converter module branch circuit parallel connection；Wherein, every phase multilevel converter module branch is divided into bridge arm and lower bridge arm, the upper bridge arm and lower bridge arm of every phase multilevel converter module branch include the buffer inductance of n multilevel converter module and connection connected in series being sequentially connected in series, and n is the positive integer greater than 1；Capacitive branch is divided into bridge arm and lower bridge arm on DC bus side, and bridge arm and lower bridge arm include being sequentially connected in series n capacitance module on DC bus side.This cross split-phase power supply topological structure can take stream according to two sides Traction networks actual conditions are two-way, make train do not power off by split-phase, have the advantages that be not necessarily to transformer access.
Description
Technical field
The invention belongs to power electronics fields more particularly to a kind of power supply for crossing split-phase for high speed rail system to open up
Flutter structure and control method.
Background technique
In the current grid mode in China, when having higher level-one power grid, often no longer make low level-one power grid knot inscription of loop,
Therefore when using 110kV or 220kV to be powered to traction change, unilateral power supply or radial power supply mode are mostly used.Using
When this power supply mode, voltage difference is very big between adjacent supply arm, and the supply arm of different voltages phase cannot be directly connected to, therefore
There is an isolation section between two-phase supply arm, needs to carry out electrical isolation by isolation link every 20-30km, be supplied in traction
Electric phase-separating section is commonly referred to as in electric system.Electric phase-separating section is one section of non-Electric region, its length is differed from several hundred rice to one kilometer,
When train passes through electric phase-separating section, will run out of steam supply, will be passed through by coast, therefore damage can be brought to train speed
It loses, restricts the high-speed cruising of train.The end of supply arm is provided with subregion institute, under traction substation fault condition, closure point
Area switch, by adjacent traction substation carry out over-zone feeding.There is the subregion institute both end voltage phase of some tractive power supply systems
Position is different (such as single-phase tie lines traction substation), and at this time subregion is actually also an electric phase-separating section.
Traction networks powering mode and corresponding traction substation rotation phase sequence connection type due to China's current determine
Electric split-phase link (also referred to as neutral section) is certainly existed on Traction networks.In existing automatic phase splitting technology, either
Floor switches automatically switch to automatically control power-off scheme on scheme or vehicle, when locomotive leads to phase splitting neutrality section, all necessarily
Undergo one from there is electricity to without electricity, again to the process for having electricity, pantograph is unable to belt current and enters neutral section from supply arm at this time,
Or belt current enters supply arm from neutral section.In case of such case, it will cause the serious arcing electric discharge of contact net, supplied in traction
Occur overvoltage impact in electric system, cause traction substation tripping, carrier cable broken string, neutral section insulator burn out etc. it is serious after
Fruit, this phenomenon of the failure are called train and rush split-phase.Electric split-phase link and automatic passing over of neutral section problem seriously restrict always at a high speed, again
The safe and reliable operation of vehicle is listed, the problem of in order to eliminate the overvoltage and overcurrent during split-phase, it is also necessary to install additional multiple
Miscellaneous automatic neutral-section passing device.
To solve overvoltage, the overcurrent problem when split-phase, Wei Xiaojuan et al. is proposed on neutral section vacuum circuit breaker
Parallel resistance can not reduce the amplitude of overvoltage and overcurrent to accelerate the decaying of overvoltage and overcurrent；Southwestern traffic
University Dong Zhijie et al. is proposed to replace vacuum circuit breaker with Thyristors in series valve group, power supply dead time can be reduced to
30ms；These methods all without eliminating power supply dead zone of the locomotive in logical phase splitting link, thus can not also eliminate at all by
The problem of overvoltage brought by being operated in power-off-telegram in reply and overcurrent.Beijing Jiaotong University Wang Shuhe et al. proposes one kind not
Split-phase scheme was powered off, two traction power supply arm voltages are down to 500V by transformer, are respectively connected to multiple single-phase back-to-back unsteady flows
One AC port of device, another AC port of all current transformers is then all in parallel, accesses after transformer rises to 27.5kV
Neutral section.Though the program can be realized locomotive and not power off excessive phase, the disadvantage is that the program require locomotive enter neutral section it
To coasting state, therefore although locomotive charges always in logical phase splitting, tractive force and speed still have preceding necessary off-load
It is lost；Tsinghua University Tian Xu et al. proposes not power off passing phase insulator device based on two-phase type MMC, although the program is moved using frequency conversion
Phase technology can be realized locomotive and lead to phase splitting without power-off, full power, but take stream since its is single-phase, on the one hand may make
It obtains side traction transformer capacity deficiency and overloads, on the other hand may aggravate negative phase-sequence imbalance keeps degree of unbalancedness exceeded, leads
The limitation of application is caused.
Summary of the invention
Stream is taken the object of the present invention is to provide a kind of actual conditions according to two sides Traction networks are two-way, does not power off train logical
Crossed the topological structure of split-phase.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of confession for crossing split-phase for high speed rail system
Device module branch and capacitive branch, u, v, the more level changes of current of w three-phase are moved in electric topological structure, including u, v, the more level changes of current of w three-phase
It is in parallel with capacitive branch after device module branch circuit parallel connection；Wherein, every phase multilevel converter module branch is divided into bridge arm and lower bridge
Arm, the upper bridge arm and lower bridge arm of every phase multilevel converter module branch include n more level changes of current being sequentially connected in series
The buffer inductance of device module and connection connected in series, n are the positive integer greater than 1；Capacitive branch is divided into bridge arm on DC bus side
And lower bridge arm, bridge arm and lower bridge arm include being sequentially connected in series n capacitance module on DC bus side.
In the above-mentioned power supply topological structure for crossing split-phase for high speed rail system, each multilevel converter module is equal
Including the first full control switching device, the second full control switching device and first capacitor；Wherein, the first full control switching device and second
Full control switching device series connection, first capacitor are in parallel with the first full control switching device and the second full control series arm of switching device.
In the above-mentioned power supply topological structure for crossing split-phase for high speed rail system, bridge arm and lower bridge on DC bus side
Arm includes 2n capacitance module support pressure stabilizing and neutral point is arranged at its center, and neutral point is connected with rail, is zero potential.
A kind of control method of power supply topological structure that crossing split-phase for high speed rail system, by u, v, how electric w three-phase is
Flat current changer module branch and neutral point cooperation carry out individual-phase control, realize train by the opposite traction power supply arm β of traction power supply arm α
During mutually running, do not power off through excessive alpha region；The following steps are included:
Step 1, when train passes through neutral section by traction power supply arm α phase, three-phase alternating current high voltage side current by u phase it is more
Level converter module branch carries out the support pressure stabilizing of multi-level rectifying control and capacitive branch, then passes through the more level changes of current of v phase
Device module branch carries out multi-level rectifying control, and exports fundamental wave sinusoidal voltage and fundamental wave sinusoidal current according to the requirement of phase shift,
Power is provided for train；
Step 2, when train is when neutral section is run, three-phase alternating current high voltage side current passes through u phase multilevel converter mould
Block branch or w phase multilevel converter module branch carry out the support pressure stabilizing of multi-level rectifying control and capacitive branch, then pass through v
Phase multilevel converter module branch carries out multi-level rectifying control, and exports fundamental wave sinusoidal voltage and base according to the requirement of phase shift
Wave sinusoidal current provides power for train；
Step 3, when train is run from neutral section to traction power supply arm β phase, three-phase alternating current high voltage side current pass through w phase
Multilevel converter module branch carries out the support pressure stabilizing of multi-level rectifying control and capacitive branch, then is changed by the more level of v phase
It flows device module branch and carries out multi-level rectifying control, and export fundamental wave sinusoidal voltage and the sinusoidal electricity of fundamental wave according to the requirement of phase shift
Stream, provides power for train.
Beneficial effects of the present invention: stream can be taken according to two sides Traction networks actual conditions are two-way, proposes to utilize u, v, w three-phase
The topological structure and control method of individual-phase control are realized in multi-level converter module branch and neutral point cooperation, are effectively alleviated
It is single-phase to take electricity that overload since traction transformer capacity is insufficient, negative phase-sequence imbalance may be aggravated and make degree of unbalancedness exceeded
Problem；It is accessed, is significantly reduced without transformer using the three-phase multi-level converter module branch of three output ports
The cost and installation space of equipment.
Detailed description of the invention
Fig. 1 is the topology diagram of one embodiment of the invention；
Fig. 2 is that the energy of one embodiment of the invention flows to schematic diagram.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
The present embodiment is achieved through the following technical solutions, as shown in Figure 1, a kind of cross split-phase for high speed rail system
Power supply topological structure, is u, v, w three-phase multilevel converter module branch, and every phase multilevel converter module branch is divided into bridge
Arm and lower bridge arm, u, v, w three-phase multilevel converter module branch road bridge arm and lower bridge arm are respectively by n multilevel converter mould
Block MMC and buffer inductance are constituted, and bridge arm and lower bridge arm are made of n capacitance module respectively on DC bus side, n for greater than
1 positive integer；Wherein, the second interface a12 and the second multilevel converter module of the first multilevel converter module MMC1
The first interface a21 connection of MMC2, n multilevel converter module MMC is according to the first multilevel converter module MMC1 and
The connection type of two multilevel converter module MMC2 is sequentially connected in series；The second interface b12 of first capacitor module C1 and
The first interface b21 connection of two capacitance module C2, n capacitance module C is according to first capacitor module C1 and the second capacitance module C2
Connection type be sequentially connected in series to form capacitive branch；After three-phase multilevel converter module MMC branch circuit parallel connection, with capacitor branch
Road is in parallel.
Moreover, the first multilevel converter module MMC1 is by the first full control switching device S11, the second full control switching device
S12 and first capacitor C11 is constituted；Wherein, the first full control switching device S11 connects with the second full control switching device S12；First
The control series arm of switching device S12 is in parallel entirely with the first full control switching device S11 and second by capacitor C11.
Moreover, the upper bridge arm of DC bus side and lower bridge arm contain n capacitance module C, and this 2n capacitance module C support
Simultaneously neutral point is arranged in pressure stabilizing at its center, and neutral point is connected with rail, is zero potential.
As shown in Fig. 2, u, v, w phase and neutral point of three-phase multilevel converter module branch cooperate, it can be achieved that split-phase control
System.When train passes through neutral section by supply arm α phase, three-phase alternating current high voltage side current passes through u phase multilevel converter module
Branch carries out multi-level rectifying control to alternating current, is supported pressure stabilizing by capacitive branch；Have from the absorption of traction power supply arm
Function power is simultaneously transferred to v phase multilevel converter module branch, and v phase multilevel converter module branch is defeated according to the requirement of phase shift
Fundamental wave sinusoidal voltage and fundamental wave sinusoidal current out, and power is provided for train load；When train is in neutral section, the more level of u phase
Current changer module branch or w phase multilevel converter module branch control three-phase alternating current high voltage side current, pass through capacitive branch
It is supported pressure stabilizing；Active power is absorbed from traction power supply arm and is transferred to v phase multilevel converter module branch, v Xiang Duo electricity
Flat current changer module branch exports fundamental wave sinusoidal voltage and fundamental wave sinusoidal current according to the requirement of phase shift, and provides for train load
Power；When train passes through neutral section by supply arm β phase, w phase multilevel converter module branch controls three-phase alternating current high pressure
Side electric current absorbs active power from traction power supply arm and is transferred to v phase multilevel converter module branch, the more level changes of current of v phase
Device module branch exports fundamental wave sinusoidal voltage and fundamental wave sinusoidal current according to the requirement of phase shift, and provides power for train load；
Durings run in train by the opposite supply arm β phase of supply arm α three, when current transformer work, common DC bus voltage
It keeps stablizing, the DC voltage of each submodule also keeps stable.
When it is implemented, bridge arm and lower bridge arm are made of n=7 multilevel converter module respectively in u, v, w phase, it is mostly electric
Flat current changer module selects FD800R45KL3-K_B5 module.
When train is by supply arm α neutral section operation in opposite directions, three-phase alternating current high voltage side current is changed by the more level of three-phase
The u phase of stream device module branch carries out multi-level rectifying control, and is supported pressure stabilization function by capacitive branch, then pass through three-phase
The v phase of multilevel converter module branch carries out multi-level rectifying control；Train is when neutral section is run, three-phase alternating current high pressure
Side electric current carries out more level according to two sides Traction networks actual conditions, by the w phase or u phase of three-phase multilevel converter module branch
Rectification control is supported pressure stabilization function by capacitive branch, then is carried out by the v phase of three-phase multilevel converter module branch
Multi-level rectifying control；When train is run from neutral section to supply arm β phase, three-phase alternating current high voltage side current is more by three-phase
The w phase of level converter module branch carries out multi-level rectifying control, is supported pressure stabilization function by capacitive branch, passes through three
The v phase of phase multilevel converter module branch carries out multi-level rectifying control, finally makes train from the opposite supply arm of supply arm α
During three that β phase is run, it can not power off through excessive alpha region.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (4)
1. a kind of power supply topological structure for crossing split-phase for high speed rail system, characterized in that including u, v, the more level of w three-phase are changed
Flow device module branch and capacitive branch, u, v are in parallel with capacitive branch after w three-phase multilevel converter module branch circuit parallel connection；Its
In, every phase multilevel converter module branch is divided into bridge arm and lower bridge arm, the upper bridge of every phase multilevel converter module branch
Arm and lower bridge arm include the buffer inductance of n multilevel converter module and connection connected in series being sequentially connected in series, and n is
Positive integer greater than 1；Capacitive branch is divided into bridge arm and lower bridge arm on DC bus side, and bridge arm and lower bridge arm are equal on DC bus side
Including being sequentially connected in series n capacitance module.
2. the power supply topological structure of split-phase is crossed for high speed rail system as described in claim 1, characterized in that each mostly electric
Flat current changer module includes the first full control switching device, the second full control switching device and first capacitor；Wherein, the first full control
Switching device connect with the second full control switching device, and first capacitor controls switching device with the first full control switching device and second entirely
Series arm is in parallel.
3. the power supply topological structure of split-phase is crossed for high speed rail system as described in claim 1, characterized in that DC bus
Bridge arm and lower bridge arm include 2n capacitance module support pressure stabilizing and neutral point, neutral point and rail phase are arranged at its center on side
It even, is zero potential.
4. a kind of control method for the power supply topological structure for crossing split-phase for high speed rail system, characterized in that pass through u, v, w tri-
Phase multilevel converter module branch and neutral point cooperation carry out individual-phase control, realize that train is drawn in opposite directions by traction power supply arm α
During supply arm β phase is run, do not power off through excessive alpha region；The following steps are included:
Step 1, when train passes through neutral section by traction power supply arm α phase, three-phase alternating current high voltage side current pass through the more level of u phase
Current changer module branch carries out the support pressure stabilizing of multi-level rectifying control and capacitive branch, then passes through v phase multilevel converter mould
Block branch carries out multi-level rectifying control, and exports fundamental wave sinusoidal voltage and fundamental wave sinusoidal current according to the requirement of phase shift, for column
Vehicle provides power；
Step 2, when train is when neutral section is run, three-phase alternating current high voltage side current passes through u phase multilevel converter module branch
Road or w phase multilevel converter module branch carry out the support pressure stabilizing of multi-level rectifying control and capacitive branch, then more by v phase
Level converter module branch carries out multi-level rectifying control, and is exporting fundamental wave sinusoidal voltage and fundamental wave just according to the requirement of phase shift
String electric current provides power for train；
Step 3, when train is run from neutral section to traction power supply arm β phase, three-phase alternating current high voltage side current pass through w Xiang Duo electricity
Flat current changer module branch carries out the support pressure stabilizing of multi-level rectifying control and capacitive branch, then passes through v phase multilevel converter
Module branch carries out multi-level rectifying control, and exports fundamental wave sinusoidal voltage and fundamental wave sinusoidal current according to the requirement of phase shift, is
Train provides power.
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| CN201811472571.XA CN109484254B (en) | 2018-12-04 | 2018-12-04 | Power supply topological structure for passing neutral section of high-speed railway system and control method |
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Cited By (1)
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| CN110011336A (en) * | 2019-03-27 | 2019-07-12 | 武汉大学深圳研究院 | High-speed railway imbalance compensation topological system based on excessive phase load linear regulation |
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| CN101854061A (en) * | 2010-04-30 | 2010-10-06 | 浙江大学 | Circulating-current restraining method for three-phase modular multilevel convertor |
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| CN110011336A (en) * | 2019-03-27 | 2019-07-12 | 武汉大学深圳研究院 | High-speed railway imbalance compensation topological system based on excessive phase load linear regulation |
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