CN215705816U - Single-ended power supply system between long stator sections of high-speed magnetic suspension train - Google Patents
Single-ended power supply system between long stator sections of high-speed magnetic suspension train Download PDFInfo
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- CN215705816U CN215705816U CN202122038182.XU CN202122038182U CN215705816U CN 215705816 U CN215705816 U CN 215705816U CN 202122038182 U CN202122038182 U CN 202122038182U CN 215705816 U CN215705816 U CN 215705816U
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- power supply
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- 238000005339 levitation Methods 0.000 claims description 5
- 101100165827 Mus musculus Cables1 gene Proteins 0.000 description 4
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- 230000001360 synchronised effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model discloses a high-speed magnetic suspension train long stator interval single-ended power supply system, which belongs to the technical field of magnetic suspension train long stator single-ended power supply, and comprises a plurality of power supply intervals m, wherein the output feed points of a transformer substation inverter are arranged at the middle point of each power supply interval, and m is 1,2,3, a. The scheme solves the problem that the loss and the voltage drop of a power supply interval cable can not be reduced in the prior art, and is suitable for a single-ended power supply mode.
Description
Technical Field
The utility model belongs to the technical field of single-ended power supply of long stators of magnetic suspension trains, and particularly relates to a single-ended power supply system between long stator sections of a high-speed magnetic suspension train.
Background
The traction power supply system converts the 110KV or 220KV power frequency alternating current of the high-voltage power grid into an adjustable frequency voltage regulation power supply required by the driving of the magnetic suspension train through voltage reduction, rectification and inversion, and supplies power to the ground long stator coil. At present, the long stator inter-zone power supply technology has the following two types:
(1) single-end power supply: the traction transformer substation of the single-ended power supply system structure is positioned at one end, the left end or the right end of the power supply interval. When the magnetic suspension vehicle runs, only one transformer substation supplies power to the magnetic suspension vehicle at any power supply time, and the power supply is called single-ended power supply, wherein each transformer substation is provided with two sets of inverters.
(2) And double-end power supply: in the double-end power supply mode, two traction substations are respectively positioned at two ends of a power supply interval, and when the magnetic suspension vehicle runs, the two substations simultaneously supply power to the magnetic suspension vehicle at any power supply time; the scheme does not relate to a double-end power supply mode.
The single-end power supply mode has the problems that when a train is positioned at the far end of a power supply interval, the power supply distance of a transformer substation is longest, the impedance of a power supply cable is the largest, and the cable loss and the voltage drop are also the largest, so that the longer the power supply path is, the larger the cable impedance is, and the larger the cable loss and the voltage drop are; the resistance loss of the interval power supply cable can cause the heating of the cable, and the insulation strength of the motor armature cable is reduced; the local supply cable also has a reactance. The cable impedance will cause a corresponding voltage drop. When the motor operates at a constant voltage, namely a maglev train operates at a high speed, the impedance voltage drop of the power supply cable in the interval can cause the loss of traction force, and the high-speed traction characteristic of the motor is influenced. The influence can be reduced by adopting a thickened or parallel power supply interval power supply cable, but the construction investment of the system is increased, and the construction cost is greatly increased.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the single-ended power supply system between the long stator sections of the high-speed magnetic suspension train solves the problem that the loss and the voltage drop of a cable between the power supply sections cannot be reduced in the prior art.
In order to achieve the purpose of the utility model, the utility model adopts the technical scheme that:
the scheme provides a single-ended power supply system between long stator sections of a high-speed magnetic suspension train, which comprises a plurality of power supply sections m, wherein the output feed points of a transformer substation inverter are arranged at the middle points of the power supply sections, and m is 1,2, 3;
the structure of each power supply interval is the same, and an inverter of a transformer substation Am, an inverter of a transformer substation Bm, a first interval cable connected with the inverter of the transformer substation Am, a second interval cable connected with the inverter of the transformer substation Bm, an interval switch group QJKm arranged on the interval cable and positioned on one side of the transformer substation Am and the transformer substation Bm, a plurality of switch stations which are connected with the first interval cable and the second interval cable and are sequentially arranged from near to far away from the interval switch group QJKm, and a long stator connected with each switch station are sequentially arranged in each power supply interval.
The utility model has the beneficial effects that: the scheme is suitable for a single-ended power supply mode, the longest distance of the inverter of the transformer substation for feeding the magnetic suspension train is only half of the power supply interval, the cable loss and voltage drop of the interval can be effectively reduced, and the single-ended power supply system between the long stator intervals provided by the scheme is effective for a normally conducting or superconducting magnetic suspension traction power supply system; the long stator interval single-ended power supply system provided by the scheme adds the interval switch group QJKm between power supply intervals, does not need to change ground equipment to the existing interval single-ended power supply system, is easy to realize, can reduce the loss and the voltage drop of a power supply interval cable, improves the efficiency of a traction system, and can also improve the traction force of a long stator synchronous motor when a maglev train is high-speed due to the reduction of the voltage drop of the power supply interval cable.
Furthermore, the output feed point of the inverter of the substation Am and the output feed point of the inverter of the substation Bm are both arranged at the half interval length in each power supply interval.
The beneficial effect of adopting the further scheme is as follows: the output feed point of the inverter of the section transformer substation Am and the output feed point of the inverter of the section transformer substation Bm are both arranged at the half section length position in the power supply section m, when the magnetic suspension train enters each power supply section, the distance between the train and the output feed point of the inverter of the transformer substation is only half of the power supply section, and the loss and the voltage drop of the current of the long stator linear synchronous traction motor generated in the section power supply cable are reduced by half compared with the conventional wiring mode.
Further, the block switch group QJKm is closed only after the fault of the substation Am or the substation Bm is removed.
The beneficial effect of adopting the further scheme is as follows: the interval switch group QJKm is disconnected when the high-speed magnetic suspension train long stator interval single-end power supply scheme provided by the scheme normally operates, namely, the interval transformer substation Am and the interval transformer substation Bm are correspondingly and non-electrically connected with the interval transformer substation Am +1 and the interval transformer substation Bm +1 respectively, and the interval switch group QJKm is closed and is powered by the adjacent interval transformer substations when the interval transformer substation Am or Bm in the power supply interval m fails, so that the reliability of the system provided by the scheme is improved.
Drawings
Fig. 1 is a structural diagram of a single-ended power supply system for a long stator section of a high-speed magnetic levitation train in the embodiment of the utility model.
Fig. 2 is a structural diagram of a conventional long stator inter-sector single-ended power supply system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the utility model as defined and defined in the appended claims, and all matters produced by the utility model using the inventive concept are protected.
As shown in fig. 1, in an embodiment of the present invention, the present solution provides a single-ended power supply system between long stator sections of a high-speed magnetic levitation train, including a plurality of power supply sections m that set output feeding points of a substation inverter at a midpoint of the power supply sections, where m is 1,2, 3.
The structure of each power supply interval is the same, and an inverter of a transformer substation Am, an inverter of a transformer substation Bm, a first interval cable connected with the inverter of the transformer substation Am, a second interval cable connected with the inverter of the transformer substation Bm, an interval switch group QJKm arranged on the interval cable and positioned on one side of the transformer substation Am and the transformer substation Bm, a plurality of switch stations which are connected with the first interval cable and the second interval cable and are sequentially arranged from near to far away from the interval switch group QJKm, and a long stator connected with each switch station are sequentially arranged in each power supply interval;
the long stator interval single-ended power supply system provided by the scheme adds the interval switch group QJKm between power supply intervals, does not need to change ground equipment to the existing interval single-ended power supply system, is easy to realize, can reduce the loss and the voltage drop of a power supply interval cable, improves the efficiency of a traction system, and can also improve the traction force of a long stator synchronous motor when a maglev train is high-speed due to the reduction of the voltage drop of the power supply interval cable.
The output feed point of the inverter of the transformer substation Am and the output feed point of the inverter of the transformer substation Bm are both arranged at the length of one-half interval in each power supply interval;
when the maglev vehicle enters each power supply interval, the longest distance between the train and the power supply point of the transformer substation is only half of the power supply interval, and the loss and the voltage drop of the current of the long stator linear synchronous traction motor in the interval power supply cable are reduced by half compared with the conventional wiring mode.
The interval switch group QJKm is closed only after the fault of the transformer substation Am or the transformer substation Bm is removed;
the interval switch group QJKm is disconnected when the high-speed magnetic suspension train long stator interval single-end power supply scheme provided by the scheme normally operates, namely, the interval transformer substation Am and the interval transformer substation Bm are correspondingly and non-electrically connected with the interval transformer substation Am +1 and the interval transformer substation Bm +1 respectively, and the interval switch group QJKm is closed and is powered by the adjacent interval transformer substations only when the interval transformer substation Am or the interval transformer substation Am in the power supply interval m fails, so that the reliability of the power supply system provided by the scheme is improved.
The utility model has the beneficial effects that: the scheme is suitable for a single-ended power supply mode, the longest distance between the transformer substation and the magnetic suspension train to feed is only half of the power supply interval, the loss and the voltage drop of the interval power supply cable can be effectively reduced, and the long-stator interval single-ended power supply system provided by the scheme is effective to a normally conducting or superconducting magnetic suspension traction power supply system.
As shown in fig. 2, a power supply section of a conventional single-ended power supply system with a long stator section includes a substation a1, a substation B1, a first section cable connected to the substation a1, a second section cable connected to the substation B1, a plurality of switchyards which are connected to the first section cable and the second section cable respectively and are sequentially arranged from near to far from the substation a1 and the substation B1, and a long stator connected to each of the switchyards; in the traditional single-ended power supply system between long stators, in order to save investment and reduce the number of transformer substations, the power supply interval of a high-speed maglev train is generally as long as possible, for example, the power supply interval of Shanghai high-speed maglev is 30km, because the power supply interval is long, the current of the long stator is large, the loss generated by the resistance of an interval power supply cable per se cannot be ignored, and the resistance loss P of the interval cableKThe expression of (a) is as follows:
PK＝3RK·lK·Is 2
wherein R isKDenotes the resistance per unit length of the first and second section cables per phase, lKIndicating supply of powerInterval length, IsRepresenting long stator currents.
Since the power supply section is as long as 30km, the inductance of the section power supply cable itself is not negligible. Voltage drop per phase U generated by interval cablekThe expression of (a) is as follows:
Uk＝(Rk *+jXk)lkIS
wherein R isk *Complex conjugate numbers representing resistance per unit length of phase of the first and second span cables, j representing imaginary part, XkThe inductance per unit length of the first and second section cables is expressed as lKIndicates the length of the power supply section, IsRepresenting long stator currents.
The voltage drop can obviously reduce the end voltage of the long stator motor and influence the high-speed traction performance of the motor, and the resistance loss P of the interval cableKExpression of (2) and voltage drop per phase U produced by the span cablekThe expression of (2) is obtained, and the loss and the voltage drop of the interval cable are in direct proportion to the length of a power supply interval; reducing this length can effectively reduce these two kinds of circuit losses, but reducing the length of power supply interval can increase the cost of system remarkably, consequently, the high-speed magnetic levitation train long stator interval single-ended power supply system that this scheme of adoption provided sets up the transformer substation in the power supply interval in the mid point of power supply interval, and the equivalent power supply distance only is half of traditional long stator interval single-ended power supply system power supply interval.
In an implementation example of the scheme, under the condition that the length of a power supply interval of a traditional long-stator-interval single-ended power supply system is kept unchanged, an output feed point of an inverter of a substation is moved from an end point of the power supply interval to a middle point of the power supply interval, in actual implementation, the inverter of the substation arranged at a non-end point can be unmoved, cables of the power supply interval are arranged at the left side and the right side of the substation respectively by 1/2 of the length of the power supply interval, and then interval isolation switches are arranged, so that the same effect can be achieved.
Claims (3)
1. A single-ended power supply system between long stator sections of a high-speed magnetic suspension train is characterized by comprising a plurality of power supply sections m, wherein the output feed points of a transformer substation inverter are arranged at the middle points of the power supply sections, and m is 1,2,3,.
The structure of each power supply interval is the same, and an inverter of a transformer substation Am, an inverter of a transformer substation Bm, a first interval cable connected with the inverter of the transformer substation Am, a second interval cable connected with the inverter of the transformer substation Bm, an interval switch group QJKm arranged on the interval cable and positioned on one side of the transformer substation Am and the transformer substation Bm, a plurality of switch stations which are connected with the first interval cable and the second interval cable and are sequentially arranged from near to far away from the interval switch group QJKm, and a long stator connected with each switch station are sequentially arranged in each power supply interval.
2. The single-ended power supply system for the long stator section of the high-speed magnetic levitation train according to claim 1, wherein an output feed point of the inverter of the transformer substation Am and an output feed point of the inverter of the transformer substation Bm are both arranged at a half section length in each power supply section.
3. The high-speed magnetic-levitation train long-stator section single-ended power supply system according to claim 2, wherein the section switch set QJKm is closed after a fault of a transformer substation Am or a transformer substation Bm is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122038182.XU CN215705816U (en) | 2021-08-26 | 2021-08-26 | Single-ended power supply system between long stator sections of high-speed magnetic suspension train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122038182.XU CN215705816U (en) | 2021-08-26 | 2021-08-26 | Single-ended power supply system between long stator sections of high-speed magnetic suspension train |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215705816U true CN215705816U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122038182.XU Expired - Fee Related CN215705816U (en) | 2021-08-26 | 2021-08-26 | Single-ended power supply system between long stator sections of high-speed magnetic suspension train |
Country Status (1)
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|---|---|
| CN (1) | CN215705816U (en) |
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2021
- 2021-08-26 CN CN202122038182.XU patent/CN215705816U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220201 |