CN113212253A - Through type traction power supply system - Google Patents
Through type traction power supply system Download PDFInfo
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- CN113212253A CN113212253A CN202110583141.0A CN202110583141A CN113212253A CN 113212253 A CN113212253 A CN 113212253A CN 202110583141 A CN202110583141 A CN 202110583141A CN 113212253 A CN113212253 A CN 113212253A
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- 238000005192 partition Methods 0.000 claims abstract description 9
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- 238000005191 phase separation Methods 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
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- 230000001174 ascending effect Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
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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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- 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
- B60M3/04—Arrangements for cutting in and out of individual track sections
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Abstract
The invention provides a through-type traction power supply system, which comprises: the system comprises a first traction transformer, a second traction transformer, a same-phase power supply device, an electronic switch passing split-phase device, a main transformer station bus and a subarea station; the input end of a first traction transformer is connected with a system three-phase power grid, the first output end of the first traction transformer is connected with a main transformer station bus, and the second output end of the first traction transformer is connected with the main transformer station bus through a same-phase power supply device; the input end of a second traction transformer is connected with a system three-phase power grid, the first output end of the second traction transformer is connected with a main transformer station bus, and the second output end of the second traction transformer is connected with the main transformer station bus through a same-phase power supply device; the main transformer station bus is connected with a traction network; and a partition is arranged on a traction network connecting the first traction transformer and the second traction transformer, and an electronic switch passing phase splitting device connected with the traction network is arranged in the partition. The invention can realize the communication of the main transformer station bus.
Description
Technical Field
The invention belongs to the technical field of power supply, and particularly relates to a through type traction power supply system.
Background
The present electrified railway power supply system and its technique in our country belongs to unilateral power supply, and has the following three outstanding problems when realizing high-speed and heavy-load electric traction:
(1) problems with excessive phase separation
The traction substation and the subarea station in the traction power supply system are respectively provided with an electric phase splitting: the traction substation is in out-phase passing neutral section, and the subarea stations are in-phase passing neutral section. The passing phase splitting device has the advantages of complex electromechanical process, complex structure, frequent action, short service life and low reliability, and the failure of the automatic passing phase splitting at the traction substation causes out-phase short circuit.
(2) Train speed and traction loss problems caused by electric phase splitting
Under the influence of train speed and long and large marshalling double-bow current, the length of a neutral section of a high-speed railway is increased to about 1km, about 5 percent of power supply lines belong to a non-electricity area, the overall performance of a traction power supply system is seriously influenced, the speed of a heavy-duty railway is low, the speed of the train is further reduced during over-current phase splitting, and under special conditions, if the electric phase splitting arranged on a large slope is easy to cause the slope stop of the heavy-duty train, in short, the electric phase splitting becomes the weakest link in the traction power supply system of the high-speed and heavy-duty railway.
(3) Negative sequence based power quality problems
At present, the running mode of the traction power supply system of the electrified railway is mainly determined by the wiring mode of a traction transformer, wherein except a pure single-phase wire, other modes are two-phase (out-of-phase) power supply, and compared with a three-phase power system, the traction load has asymmetry. Due to the load asymmetry, severe negative sequence currents are generated in the system.
In order to solve the three problems, the current main domestic research direction is the same as the in-phase power supply technology, but only the electric phase splitting at the outlet of the substation is solved, and the power supply has certain negative sequence and reactive power compensation capability. For the electric phase separation between traction substations, the processing capacity is lacking. For the negative sequence processing, a phase sequence rotation connection mode is adopted, so that the negative sequence current generated by the traction power supply system to the system is reduced.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a through type traction power supply system, which comprises: the system comprises a first traction transformer, a second traction transformer, a same-phase power supply device, an electronic switch passing split-phase device, a main transformer station bus and a subarea station;
the input end of the first traction transformer is connected with a system three-phase power grid, the first output end of the first traction transformer is connected with the main substation bus, and the second output end of the first traction transformer is connected with the main substation bus through the in-phase power supply device;
the input end of the second traction transformer is connected with a system three-phase power grid, the first output end of the second traction transformer is connected with the main substation bus, and the second output end of the second traction transformer is connected with the main substation bus through the in-phase power supply device;
the main transformer station bus is connected with a traction network;
the partition station is arranged on the traction network connecting the first traction transformer and the second traction transformer, and the electronic switch neutral section passing device connected with the traction network is arranged on the partition station.
As a further development of the invention, the first traction transformer and the second traction transformer both use scott connections.
As a further improvement of the present invention, M-seats of the first traction transformer are connected to the main substation bus, and T-seats of the first traction transformer are connected to the main substation bus sequentially through the electronic switch neutral section passing device and the high voltage matching transformer;
and the M seat of the second traction transformer is connected with the main substation bus, and the T seat of the second traction transformer is connected with the main substation bus through the electronic switch passing neutral section device and the high-voltage matching transformer in sequence.
As a further improvement of the invention, the main substation buses adopt single bus sectional wiring.
As a further improvement of the present invention, the first traction transformer and the second traction transformer adopt a common-tank common-conservator or a split-tank split-conservator.
As a further development of the invention, the partitions are provided with an electrical phase separation.
As a further improvement of the invention, said main substation buses of adjacent main substations are arranged in phase.
As a further improvement of the present invention, a high leakage reactance transformer is adopted as the first traction transformer and the second traction transformer.
Compared with the prior art, the invention has the following beneficial effects: the invention firstly carries out three-phase-one-way conversion by the in-phase power supply device to realize in-phase power supply; and thirdly, the electronic switch passing neutral section device is adopted in the subareas, and the communication of the main substation buses is realized through the quick on-off of the electronic switch passing neutral section device.
Drawings
Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic structural diagram of a through-type traction power supply system according to embodiment 1;
FIG. 2 is a schematic structural diagram of an ascending electronic switch neutral-section passing device according to embodiment 1;
FIG. 3 is a partial structural view of the through-type traction power supply system according to embodiment 2;
FIG. 4 is a schematic structural diagram of the electric switch passing neutral section device.
Description of the labeling: 1. an electronic switch passing neutral section device; 11. the upper electronic switch passing neutral section device; 12. the downlink electronic switch passing neutral section device; 2. a main transformer station bus; 3. a partition station; 31. and (4) electrically separating phases.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
The embodiment discloses a through-type traction power supply system, as shown in fig. 1, including: first traction transformer TTkAnd a second traction transformer TTk+1The system comprises a same-phase power supply device CPD, an electronic switch passing split-phase device 1, a main transformer station bus 2 and a subarea station 3; first traction transformer TTkIs connected to the three-phase network of the system, a first traction transformer TTkThe first output end of the transformer is connected with a main transformer station bus 2, and a first traction transformer TTkThe second output end of the power supply device is connected with a main transformer station bus 2 through a CPD (common phase Power supply) device; second traction transformer TTk+1Is connected to the system three-phase network, a second traction transformer TTk+1The first output end of the second traction transformer TT is connected with a main transformer station bus 2k+1The second output end of the power supply device is connected with a main transformer station bus 2 through a CPD (common phase Power supply) device; main transformer station bus 2 and traction network TNk、TNk+1Connecting; in connection with a first traction transformer TTkAnd a second traction transformer TTk+1Traction network TNk、TNk+1On the upper part, a subarea station 3 is arranged, the subarea station 3 is respectively connected with a traction network TNk、TNk+1The connected electronic switch passes through the phase separation device 1.
In particular, a first traction transformer TTkArranged in a first traction substation SSkInternal and secondary traction transformer TTk+1Arranged in a second traction substation SSk+1Internal, first traction transformer TTkAnd a second traction transformer TTk+1An AC-DC-AC semi-compensation scheme is adopted (namely, a symmetrical conversion system from three phases to single phase is realized by adopting a power-electronic conversion technology, the main idea is to realize phase conversion by an AC-DC-AC conversion system to ensure that the phases of the three phases are the same), and a first traction transformer TTkAnd a second traction transformer TTk+1After three-phase-one-way conversion is carried out by the in-phase power supply device, the phases of the outlet feeders are AkAnd Ak+1(or B)kAnd Bk+1、CkAnd Ck+1) And the in-phase power supply is realized.
First traction transformer TTkAnd a second traction transformer TTk+1A high leakage reactance transformer can be adopted, the transformer can greatly reduce the balance current generated by through power supply, and if the power supply condition of the power system is met, the first traction transformer TT can be usedkAnd a second traction transformer TTk+1The transformer is adjusted to be a single-phase high-leakage reactance transformer, the wiring is simpler, and the investment is greatly reduced.
Next, the present embodiment is further explained by using a traction network uplink, as shown in fig. 2, the section 3 is further provided with a first normally closed switch QS1, a second normally closed switch QS2, a third normally closed switch QS3, a first normally open switch QF1, a second normally open switch QF2, a third normally open switch QF3, and a fourth normally open switch QF4, the uplink electronic switch passing phase splitting device 11 includes a first high-voltage thyristor valve group SCRV1 and a second high-voltage thyristor valve group SCRV2, the traction network uplink sequentially passes through the first normally closed switch QS1, the first normally open switch QF1 and a first end of the first high-voltage thyristor valve group SCRV1, the traction network passes through the second normally closed switch QS2 and is connected with a second end of the first high-voltage thyristor valve group SCRV1, the second end of the first high-voltage thyristor valve group SCRV1 is connected with a first end of the second high-voltage thyristor valve group SCRV2, and the second normally open switch 2 is connected in parallel with both ends of the first high-voltage thyristor valve group SCRV2, the second end of the second high-voltage thyristor valve group SCRV2 is sequentially connected with the traction network in an upward mode through a third normally-open switch QF3, a third normally-closed switch QS3 and a fourth normally-open switch QF4, and the fourth normally-open switch QF4 is connected to two ends of the second high-voltage thyristor valve group SCRV2 in parallel.
When a train passes through, the first normally closed switch QS1 is in a closed state, the first high-voltage thyristor valve group SCRV1 is in a disconnected state during maintenance, the second normally closed switch QS2 is in a closed state, the third normally closed switch QS3 is in a closed state, and the second high-voltage thyristor valve group SCRV2 is in a disconnected state during maintenance; the first normally open switch QF1 is closed in a normal state, and when the first high-voltage thyristor valve group SCRV1 or the second normally open switch QF2 refuses to act, the circuit is switched off; the third normally-open switch QF3 is closed in a normal state, and when the second high-voltage thyristor valve group SCRV2 or the fourth normally-open switch QF4 refuses to act, the circuit is switched off; the second normally-open switch QF2 is standby when the first high-voltage thyristor valve group SCRV1 fails; the fourth normally open switch QF4 is standby when the second high-voltage thyristor valve group SCRV2 fails, and can quit the electronic switch valve group when the power supply condition of the electric power system is met in a long-term mode, so that bilateral power supply is thoroughly realized.
When the phase of the left and right traction net ascending is AkAnd Ak+1(or B)kAnd Bk+1、CkAnd Ck+1) In time, TN can be realized within 2.0 +/-0.5 ms by quickly switching on and off the first high-voltage thyristor valve group SCRV1 and the second high-voltage thyristor valve group SCRV2kAnd TNk+1Can also be adjusted to be flexible neutral section, then pulls the net TNkAnd TNk+1And meanwhile, novel through-type in-phase power supply is realized through amplitude modulation and phase shift.
Similarly, the traction network has the same structure in the downlink, and the implementation process is not described in detail herein.
In the above embodiment, the first traction transformer TTkAnd a second traction transformer TTk+1Scott connection wires are used.
In the above embodiment, the first traction transformer TTkM base is connected with main transformer station bus, and a first traction transformer TTkThe T seat is connected with a main transformer station bus through an electronic switch neutral section passing device and a high-voltage matching transformer in sequence; m seats of a second traction transformer are connected with a main transformer station bus, and a second traction transformer TTk+1The T seat is connected with a main transformer station bus 2 through an electronic switch passing neutral section device 1 and a high-voltage matching transformer in sequence.
In the above embodiment, the main substation bus 2 adopts a single bus sectional connection, and the circuit breaker is switched on during normal operation.
In the above embodiment, the first traction transformer TTkAnd a second traction transformer TTk+1And a common-tank common-conservator or a split-tank separate-conservator is adopted.
In the above embodiment, the electric phase splitting 31 is arranged in the partition 3, the phases of the left arm and the right arm can be set to be consistent, in addition, at the outlet of the main transformer station, the traction network is not provided with the electric phase splitting, and a plurality of segments can be arranged according to the maintenance requirement.
In summary, the present embodiment has the following technical effects:
1. solve the problem of electric phase splitting of the whole line
Compared with the single-side power supply which is widely applied at present, the novel scheme can solve the problem of full-line electric phase splitting, the power supply capacity of the traction network is stronger, the voltage is more stable, the load current on each power supply arm is reduced, the capacity required by the traction transformer in the traction substation is also reduced, the capacity of the traction transformer can be effectively saved, and simultaneously, the power and voltage loss on the traction network can be reduced due to the reduction of the current.
2. Problem of stall
Because the electric phase separation is cancelled on the whole line (or the on-off state is carried out within 2 +/-0.5 ms), when the electric passenger car passes through the electric phase separation, the vehicle-mounted circuit breaker does not need to be frequently switched on or off, and the problem of stalling or traction loss caused by power failure of the train is avoided.
3. Power quality problems represented by negative sequence
An AC-DC-AC semi-compensation scheme is adopted in the traction substation, so that the problem of negative sequence current caused by three-phase-single-phase change can be reduced.
Because the compensation device adopts the IGBT module, the reactive compensation capability can be fully utilized to compensate the capacitive power generated by the full-line cable at the moment that the in-phase device does not need to compensate the negative sequence current, such as the moment that the capacitive power occupies the main component part at night, the installation capacity of the reactor or the SVG can be cancelled or reduced, and the omnibearing energy conservation is realized.
4. Greatly prolonging service life of vehicle-mounted circuit breaker
The whole line has no electric phase splitting, and the vehicle-mounted circuit breaker does not need to be frequently switched on and off and can be operated in a charged mode for a long time. The vehicle-mounted breaker passing neutral section is used as a backup passing neutral section scheme, so that the service life can be greatly prolonged.
Example 2
The through type traction power supply system provided by the embodiment is suitable for Guangzhou certain-size line engineering, the total length of a line is about 92.1km, the design speed per hour is 160km/h, four main transformer stations are respectively arranged at four places of the whole line, and a subarea station is arranged in the middle of the line.
Compared with the common alternating current electrified railway, the line has the characteristics of short station spacing, uneven station spacing and frequent train starting and braking, and if the traditional traction power supply system is adopted for supplying power, the arrangement of the electric phase splitting in the traction power supply system can seriously influence the train operation. When the train passes through the electric phase separation, the power is cut off, the traction is lost, and the running speed of the train is influenced. If the initial speed of the train is too low, the train cannot pass through the electric phase splitting by means of inertia, and a major accident of stopping can be caused.
Meanwhile, each over-passing phase separation of the train is completed through a ground or vehicle-mounted switch, the calculation is performed twice through one switching action, if the train is started for 100 pairs every day, the over-phase separation times of the train can reach 1200 times, and the switching action is 2400 times. According to the operation experience of state railways, the fault rate generated by the over-voltage phase separation of the train is quite high in the total fault of the traction power supply system. Therefore, the electrical phase separation will have a great adverse effect on the operational reliability of the system.
As shown in fig. 3 and 4, the full-line through-type traction power supply scheme adopted in the present engineering is specifically as follows:
(1) single-phase combined in-phase power supply for traction at four locations
The traction transformer TT and the high-voltage matching transformer HMT form an unequal-sided SCOTT connection group, namely a special three-phase-two-phase balance transformer with unequal power supply capacity, unequal voltage amplitude and vertical voltage phase. In normal operation, the traction transformer TT and the in-phase power supply device CPD supply power to a traction load of a traction network, the traction transformer TT is used for a main power supply task, and the in-phase power supply device CPD is used for a secondary power supply task and adjusting the three-phase voltage unbalance.
The single-phase combined type in-phase power supply can cancel the traction substation outlet electric phase splitting, and can solve the problem of the substation outlet electric phase splitting technically.
(2) Contact net ground switch neutral section passing device implemented by subarea
And (4) setting a section station, reserving an electric split phase, and adopting a contact net ground switch to automatically pass through a split phase system.
Before the train enters a neutral zone, K3 and K4 are switched off; when the train enters a neutral zone, K3 is switched on; after the train enters a neutral zone, K3 is switched off, and K4 is switched on; after the train exits the neutral zone, K4 opens the brake.
Claims (8)
1. A pass-through traction power supply system, comprising: the system comprises a first traction transformer, a second traction transformer, a same-phase power supply device, an electronic switch passing split-phase device, a main transformer station bus and a subarea station;
the input end of the first traction transformer is connected with a system three-phase power grid, the first output end of the first traction transformer is connected with the main substation bus, and the second output end of the first traction transformer is connected with the main substation bus through the in-phase power supply device;
the input end of the second traction transformer is connected with a system three-phase power grid, the first output end of the second traction transformer is connected with the main substation bus, and the second output end of the second traction transformer is connected with the main substation bus through the in-phase power supply device;
the main transformer station bus is connected with a traction network;
the partition station is arranged on the traction network connecting the first traction transformer and the second traction transformer, and the electronic switch neutral section passing device connected with the traction network is arranged on the partition station.
2. A pass-through traction power supply system as claimed in claim 1, wherein said first traction transformer and said second traction transformer both employ scott connections.
3. A through-drive tractive power supply system as claimed in claim 2, wherein M blocks of said first traction transformer are connected to said main substation bus, and T blocks of said first traction transformer are connected to said main substation bus in sequence through said electronic switch neutral passing arrangement and a high voltage matching transformer;
and the M seat of the second traction transformer is connected with the main substation bus, and the T seat of the second traction transformer is connected with the main substation bus through the electronic switch passing neutral section device and the high-voltage matching transformer in sequence.
4. A through-traction power supply system according to any one of claims 1 to 3, wherein said main substation buses are wired in single bus sections.
5. A through type traction power supply system according to any one of claims 1 to 3, wherein the first traction transformer and the second traction transformer adopt a common tank common conservator or a split tank separate conservator.
6. A pass-through traction power supply system as claimed in claim 1, wherein said sub-sections are provided with electrically split phases.
7. A through-going tractive power supply system according to claim 1, wherein said primary substation buses of adjacent primary substations are arranged in phase.
8. A through traction power supply system according to any one of claims 1 to 3, wherein a high leakage reactance transformer is used as the first traction transformer and the second traction transformer.
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| CN202110583141.0A CN113212253A (en) | 2021-05-27 | 2021-05-27 | Through type traction power supply system |
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| CN202110583141.0A CN113212253A (en) | 2021-05-27 | 2021-05-27 | Through type traction power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336643A (en) * | 2022-03-17 | 2022-04-12 | 西南交通大学 | System for utilizing passing power of bilateral power supply traction network of regional station and control method |
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| CN101574935A (en) * | 2009-06-22 | 2009-11-11 | 北京交通大学 | Module combined power quality conditioning system for tractive power supply network |
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