CN113300349A - Subway traction power supply method and system - Google Patents
Subway traction power supply method and system Download PDFInfo
- Publication number
- CN113300349A CN113300349A CN202110600766.3A CN202110600766A CN113300349A CN 113300349 A CN113300349 A CN 113300349A CN 202110600766 A CN202110600766 A CN 202110600766A CN 113300349 A CN113300349 A CN 113300349A
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- medium
- current
- traction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/13—Trolley wires
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
Abstract
A power supply system and method for metro traction are disclosed, wherein the power supply system comprises a main transformer, the main transformer is connected with a public high-voltage power grid and used for reducing the voltage of three-phase alternating current of the public high-voltage power grid; an AC/DC converter is connected below the main transformer, the output end of the AC/DC converter is connected with the traction substation through a medium-voltage direct-current power supply line, and power is supplied to the traction substation through medium-voltage direct current; a plurality of traction substations are connected to the medium-voltage power supply line, the traction substations are connected with a subway contact network through DC/DC converters, the medium-voltage direct-current power supply line is converted into direct-current voltage required by the subway contact network, and the locomotive is supplied with power by the contact network. The invention adopts medium-voltage direct-current transmission to supply power for the traction substation, has no capacitance current to ground, low loss and less fault than alternating-current transmission, and less wires used for transmitting the same electric power than alternating-current transmission, thereby reducing the transmission cost; and the AC/DC converter and the DC/DC converter have a bidirectional conversion function, so that the regenerative braking energy of the train can be efficiently utilized, and the traction energy consumption is reduced.
Description
Technical Field
The invention relates to a power supply mode and a system device, in particular to a subway traction power supply method and a system, wherein the subway traction power supply method and the system adopt a medium-voltage power transmission mode different from the conventional medium-voltage power transmission mode; belongs to the technical field of subway traction power supply.
Background
The main stream of the subway traction power supply system adopts a DC1500V (or DC750V and DC 3000V) direct current power supply system, a train obtains direct current from a traction network through a pantograph, and a vehicle-mounted converter inverts the direct current into three-phase alternating current to drive a traction motor to realize high-speed running of the train. The traditional subway traction power supply system reduces the voltage of an urban power grid incoming line AC110kV or 220kV to a medium voltage of 35kV or 10kV through a main transformer by a main substation, and then transmits a medium voltage power supply to each traction substation through a three-phase alternating current cable. A subway line is usually 1-2 main substations and a plurality of traction substations according to the length of the line, the traction substations are generally arranged near each station, and are mainly used for converting three-phase alternating current 35kV or 10kV into direct current DC1500V (or DC750V, DC 3000V) suitable for subway trains and the like through a rectification link and sending the direct current DC1500V (or DC750V, DC 3000V) to a contact network of an adjacent section and a station line.
At present, the power supply system is widely applied to the field of urban rail transit such as subways and light rails, the technology is mature, but the power supply system has some defects, which are mainly expressed as follows: a large amount of alternating current cables are needed for long-distance power transmission, and the large capacitance current to ground, the large loss and the like exist; the rectifiers are distributed in each traction substation to generate a large amount of harmonic waves and reactive power which are directly injected into an alternating current medium voltage power grid, so that resonance is easily caused to influence the power supply quality, and the fault rate is relatively high; the rectification link needs various types of equipment such as a step-down transformer, a rectifier unit and the like, so that the management and maintenance are not convenient; the traditional diode-based rectification link can only realize unidirectional flow of electric energy, and an independent energy feedback device needs to be configured.
The search through inquiry is used for finding the same technical report, only technical literatures in related fields are provided, and the most similar technical reports are formed by the following steps:
1. the patent number is CN201410070765.2, the name is "a DC traction power supply system based on flexible DC transmission", the applicant is: the patent application discloses a direct current traction power supply system based on flexible direct current transmission, which comprises a step-down transformer, a double-end active high-voltage direct current transmission system and a step-down chopper circuit, wherein the double-end active high-voltage direct current transmission system is based on a modular multilevel converter technology and comprises two completely symmetrical converters which are connected by a direct current transmission cable; each converter is connected with three-phase alternating current through a step-down transformer; the input end of the buck chopper loop is connected with the direct current side of the double-end active high-voltage direct-current transmission system through a first switch component, and the output end of the buck chopper loop is connected with the traction system through a second switch component; the second switch assembly is interlocked with the third switch assembly, namely when the subway/light rail operates, the second switch assembly is closed, the third switch assembly is opened, when the electric locomotive operates, the third switch assembly is closed, and the second switch assembly is opened.
2. The patent number is CN201711425550.8, the name is "a medium voltage flexible direct current traction power supply system and control method thereof", the applicant is: the patent application of the invention of the southwest traffic university discloses a medium-voltage flexible direct-current traction power supply system and a control method thereof. The traction power supply system comprises more than one traction substation; the traction substation comprises a three-phase step-down transformer, a three-phase reactor, a voltage source converter and a first direct current bus which are connected in sequence; the input end of the three-phase step-down transformer is connected to a three-phase power grid, the positive pole and the negative pole of the output end of the voltage source converter are respectively connected to the positive pole and the negative pole of the first direct current bus, and the positive pole and the negative pole of the first direct current bus are respectively connected to a contact net and a steel rail through a feeder line and a return line.
3. The patent number is CN201910149140.8, named as 'an electrified railway traction power supply system', and the applicant is: the invention discloses an invention patent application of southwest traffic university, which discloses a traction power supply system of an electrified railway and belongs to the technical field of railway traction power supply systems. The central substation gets electricity from a three-phase power grid through the connecting transformer, and single-phase step-down transformers with the same transformation ratio in a traction substation arranged along the way output single-phase alternating-current voltages required by loads such as an electric locomotive after rectification and inversion; the primary side of the connecting transformer is connected with respective inductors in series and then is respectively connected with a 110kV three-phase power grid, and the output end of the connecting transformer is connected with the alternating current side of the three-phase MMC rectifier; the direct current side DC output voltage of three-phase MMC rectifier is 160kV, and inserts single-phase MMC inverter input, and the output of single-phase MMC inverter is the single phase alternating current electric wire netting that voltage level is 80kV, and this single phase alternating current electric wire netting links to each other with the single-phase step down transformer primary winding among each traction substation along the railway, single-phase step down transformer's secondary side output voltage is 27.5 kV's single phase alternating current.
Although the above patents relate to new traction power supply or power supply methods for railways, the power supply system or power supply method still uses ac power transmission for the high voltage power supply to the traction substation, so the above problems still exist, and there is a need for improvement.
Disclosure of Invention
The invention provides a subway traction power supply system, which comprises a main transformer for reducing the three-phase alternating current voltage level of a public high-voltage power grid, wherein the main transformer is connected with the public high-voltage power grid and is used for reducing the three-phase alternating current voltage of the public high-voltage power grid; the method is characterized in that: an AC/DC converter is connected below the main transformer, the output end of the AC/DC converter is connected with the traction substation through a medium-voltage direct-current power supply line, and power is supplied to the traction substation through the medium-voltage direct-current power supply line; the medium-voltage direct-current power supply line is connected with a plurality of traction substations, the traction substations are connected with a subway contact net through DC/DC converters, medium-voltage direct-current voltage of the medium-voltage power supply line is converted into direct-current voltage required by the subway contact net, and the locomotive is supplied with power by the contact net.
Furthermore, a DC/AC inverter is arranged in the traction substation, and is respectively connected with the medium-voltage power supply line and the power distribution network to convert the medium-voltage direct-current voltage of the medium-voltage power supply line into three-phase alternating-current voltage required by the power distribution network.
Further, the AC/DC converter adopts one of a thyristor converter valve, an MMC circuit or an H-bridge rectifying circuit.
Furthermore, the DC/DC converter is a chopper step-down circuit, the input end of the DC/DC chopper step-down circuit is connected with a medium-voltage power supply line through a control switch, and the output end of the DC/DC chopper step-down circuit is connected with a subway contact network.
Furthermore, the AC/DC converter adopts a thyristor converter valve circuit, the converter valve circuit comprises three parallel converter valve bridge arms, and the input end of each converter valve bridge valve is respectively connected with one output end of the main transformer.
Furthermore, the converter valve bridge arm is formed by sequentially connecting a plurality of thyristors in series, and the converter valve circuit further comprises a smoothing reactor which is connected to a direct current bus at the output end of the converter valve bridge arm.
The invention also provides a subway traction power supply method, wherein a main transformer and an AC/DC converter are arranged between a public power grid and a medium-voltage power supply line, the public power grid, the main transformer and the AC/DC converter are sequentially connected, the output end of the AC/DC converter is connected with the medium-voltage power supply line, and high-voltage alternating current of the public power grid is subjected to voltage reduction and rectification through the main transformer and the AC/DC converter and then is output to the medium-voltage power supply line between traction substations.
Further, a DC/DC converter is arranged between each traction substation and a subway overhead line system, and the DC/DC converter converts the medium-voltage direct-current voltage of the medium-voltage power supply line into the direct-current voltage required by the subway overhead line system.
Furthermore, a DC/AC inverter is connected to the medium-voltage power supply line and is connected to the power distribution network.
The invention has the beneficial effects that:
the step-down transformer in the through type subway traction power supply system is connected with an urban power grid, three-phase high-voltage alternating current of the public power grid is reduced into a proper voltage grade through the main transformer, then the three-phase alternating current power supply is rectified into medium-voltage direct current through the AC/DC converter, and then the medium-voltage direct current is reduced to direct current voltage required by the subway traction grid through the DC/DC converter. An AC/DC converter is used for rectifying a three-phase alternating current power supply into a medium-voltage direct current power supply, the output harmonic content is low, no capacitance current to the ground exists, and the loss is small; the direct current transmission has smaller fault than the alternating current transmission, and each pole is independently adjusted and controlled; the direct current transmission adopts a two-wire system, the earth and the seawater can be used as return wires, and the number of wires used for direct current transmission is less than that of wires used for alternating current transmission when the same electric power is transmitted, so that the transmission cost is reduced.
Drawings
Fig. 1 is a schematic diagram of a power supply principle of a subway traction power supply system.
Fig. 2 is a schematic diagram of the principle of realizing the utilization of regenerative braking energy by a subway traction power supply system.
Detailed Description
The following describes an embodiment of the present invention in detail with reference to fig. 1 to 2.
The embodiment provides a method for tractive power supply of a subway, wherein medium-voltage power supply lines between traction substations adopt direct current to carry power supply, a DC/DC converter 4 is arranged between each traction substation and a subway overhead line system, and the DC/DC converter 4 converts medium-voltage direct current voltage of the medium-voltage power supply lines into direct current voltage required by the subway overhead line system. The three-phase high-voltage alternating current of the public power grid 1 is reduced to a proper voltage level through a main transformer 2, then the three-phase alternating current power supply is rectified into medium-voltage direct current through an AC/DC converter 3, and then the medium-voltage direct current is reduced to direct current voltage required by a subway traction network through a DC/DC converter 4. The AC/DC converter 3 is used for rectifying the three-phase alternating current power supply into a medium-voltage direct current power supply, the output harmonic content is low, no capacitance current to the ground exists, and the loss is small; the direct current transmission has smaller fault than the alternating current transmission, and each pole is independently adjusted and controlled; the direct current transmission adopts a two-wire system, the earth and the seawater can be used as return wires, and the number of wires used for direct current transmission is less than that of wires used for alternating current transmission when the same electric power is transmitted, so that the transmission cost is reduced.
A main transformer 2 and an AC/DC converter 3 are arranged between a public power grid 1 and a medium-voltage power supply line, the public power grid 1, the main transformer 2 and the AC/DC converter 3 are sequentially connected, the output end of the AC/DC converter 3 is connected with the medium-voltage power supply line, and high-voltage alternating current of the public power grid 1 is subjected to voltage reduction and rectification through the main transformer 2 and the AC/DC converter 3 and then is output to the medium-voltage power supply line between traction substations. The DC/DC converter 4 has a function of bidirectional energy conversion. When the train is in a traction working condition, power flows from the medium-voltage direct-current power supply side to the traction network, and when the train is in a regenerative braking working condition, power flows from the traction network to the medium-voltage direct-current power supply side.
A DC/AC inverter 5 is also connected to the medium voltage supply line, connecting the DC/AC inverter 5 to the distribution network. The single-phase direct-current power supply is inverted into a three-phase alternating-current 400V power supply, and the three-phase alternating-current power supply is provided for air conditioners, elevators and the like of a power distribution network.
The following describes in detail the implementation of the metro traction power supply system with specific examples of a medium voltage direct current power supply line DC10kV or 35kV and a public power grid 1 three-phase alternating current 110kV/220 kV.
A subway traction power supply system comprises a main transformer 2 used for reducing the level of a high-voltage three-phase alternating-current voltage of a public power grid 1, and further comprises an AC/DC converter 3 connected with the main transformer 2, wherein the output end of the AC/DC converter 3 is connected with a medium-voltage power supply line between traction substations, and a plurality of traction substations are connected to the medium-voltage power supply line. The three-phase alternating current 110KV/220KV of the public power grid 1 can be rectified to be DC10kV or 35kV direct current power supply required by a medium-voltage direct current power supply line through the main transformer 2 and the AC/DC converter 3.
Furthermore, the traction substation is connected with a subway contact network through a DC/DC converter 4, and medium-voltage direct-current voltage of a medium-voltage power supply line is converted into direct-current voltage required by the subway contact network. The DC/DC converter 4 performs buck chopping on DC10kV or 35kV of a medium-voltage direct-current power supply line to a DC1500V direct-current power supply required by a subway traction network. In this embodiment, a transformer is not required between the traction substation and the subway traction network, the DC/DC converter 4 can perform output voltage regulation and energy bidirectional conversion functions, and when a train in a certain traction substation section is in a braking condition to generate regenerative braking energy, the regenerative braking energy can be fed back to a DC10kV (or 35kV and the like) bus to be used by trains in other sections or a power distribution network, so that efficient utilization of the regenerative braking energy is realized.
Further, the traction substation is connected to the distribution network via a DC/AC inverter 5, converting the medium voltage DC voltage of the medium voltage supply line to the three-phase AC voltage required by the distribution network. The DC/AC inverter 5 is connected to a DC10kV (or 35kV and the like) medium-voltage direct-current bus, inverts a single-phase direct-current power supply into a three-phase alternating-current 400V power supply, and provides a three-phase alternating-current power supply for an air conditioner, an elevator and the like of a power distribution network
In this embodiment, the AC/DC converter 3 employs a thyristor converter valve circuit, the converter valve circuit includes three parallel converter valve bridge arms, and an input end of each converter valve bridge is connected to an output end of the main transformer 2.
Furthermore, the converter valve bridge arm is formed by sequentially connecting a plurality of thyristors in series, and the converter valve circuit further comprises a smoothing reactor which is connected to a direct current bus at the output end of the converter valve bridge arm.
The converter valve circuit further comprises a smoothing reactor, and the smoothing reactor is connected to a direct current bus at the output end of a bridge arm of the converter valve. In order to reduce harmonic current, a converter valve bridge arm with 12 pulse waves, 18 pulse waves or 24 pulse waves is formed by connecting a plurality of thyristors in series to carry out rectification, and ripples in rectified voltage are suppressed by a smoothing reactor, so that output direct current is close to ideal direct current.
The direct-current transmission cable transmits a medium-voltage direct-current power supply output by the converter valve circuit to the DC/DC chopper circuit. The direct current transmission cable adopts a two-wire system, can return earth and seawater, and has less wires for direct current transmission than alternating current transmission when transmitting the same electric power, thereby reducing the transmission cost.
The technical solutions of the embodiments of the present invention are fully described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Claims (10)
1. A power supply system for subway traction comprises a main transformer for reducing the level of three-phase alternating current voltage of a public high-voltage power grid, wherein the main transformer is connected with the public high-voltage power grid and used for reducing the voltage of the three-phase alternating current of the public high-voltage power grid; the method is characterized in that: an AC/DC converter is connected below the main transformer, the output end of the AC/DC converter is connected with the traction substation through a medium-voltage direct-current power supply line, and power is supplied to the traction substation through the medium-voltage direct-current power supply line; the medium-voltage direct-current power supply line is connected with a plurality of traction substations, the traction substations are connected with a subway contact net through DC/DC converters, medium-voltage direct-current voltage of the medium-voltage power supply line is converted into direct-current voltage required by the subway contact net, and the locomotive is supplied with power by the contact net.
2. The subway traction power supply system as claimed in claim 1, wherein: the medium-voltage direct-current power supply line is medium-voltage direct current which is obtained by converting alternating current into alternating current through an AC/DC converter.
3. The subway traction power supply system as claimed in claim 1, wherein: and a DC/AC inverter is arranged in the traction substation, is respectively connected with the medium-voltage power supply line and the power distribution network and converts the medium-voltage direct-current voltage of the medium-voltage power supply line into three-phase alternating-current voltage required by the power distribution network.
4. The subway traction power supply system as claimed in claim 2, wherein: the AC/DC converter adopts one of a thyristor converter valve, an MMC circuit or an H-bridge rectifying circuit.
5. A subway traction power supply system as claimed in claim 3, wherein: the DC/DC converter is a chopping voltage reduction circuit, the input end of the DC/DC chopping voltage reduction circuit is connected with a medium-voltage power supply circuit through a control switch, and the output end of the DC/DC chopping voltage reduction circuit is connected with a subway contact network.
6. A subway traction power supply system as claimed in claim 3, wherein: the AC/DC converter adopts a thyristor converter valve circuit, the converter valve circuit comprises three parallel converter valve bridge arms, and the input end of each converter valve bridge valve is connected with one output end of the main transformer.
7. The subway traction power supply system as claimed in claim 5, wherein: the converter valve bridge arm is formed by sequentially connecting a plurality of thyristors in series, and the converter valve circuit further comprises a smoothing reactor which is connected to a direct current bus at the output end of the converter valve bridge arm.
8. A high-voltage power supply of a public high-voltage power grid is transmitted to a traction substation after being subjected to voltage reduction, then the traction substation carries out power supply arrangement and transmits the power supply to a contact network, and the contact network supplies power to a locomotive; the method is characterized in that: the step-down transmission of the high-voltage power supply of the public high-voltage power grid to the traction substation is realized by the steps of reducing the voltage of the high-voltage alternating current of the public power grid through the main transformer, rectifying the high-voltage alternating current into medium-voltage direct current through the AC/DC converter, and transmitting the power supply to the traction substation through a medium-voltage direct current transmission mode.
9. The subway traction power supply method as claimed in claim 7, wherein: and a DC/DC converter is arranged between each traction substation and the subway overhead line system, and converts the medium-voltage direct-current voltage of the medium-voltage power supply line into the direct-current voltage required by the subway overhead line system.
10. The subway traction power supply method as claimed in claim 8, wherein: and a DC/AC inverter is also connected to the medium-voltage power supply line and is connected with a power distribution network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110600766.3A CN113300349A (en) | 2021-05-31 | 2021-05-31 | Subway traction power supply method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110600766.3A CN113300349A (en) | 2021-05-31 | 2021-05-31 | Subway traction power supply method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113300349A true CN113300349A (en) | 2021-08-24 |
Family
ID=77326351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110600766.3A Pending CN113300349A (en) | 2021-05-31 | 2021-05-31 | Subway traction power supply method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113300349A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904636A (en) * | 2014-02-28 | 2014-07-02 | 株洲变流技术国家工程研究中心有限公司 | Direct current tractive power supply system based on flexible direct current power transmission |
| CN204391761U (en) * | 2014-12-08 | 2015-06-10 | 深圳供电局有限公司 | Direct-flow distribution system is pressed in a kind of flexibility |
| AU2016101444A4 (en) * | 2015-08-11 | 2016-09-15 | Abb Schweiz Ag | DC traction power supply system, distributed DC power supply and a respective housing |
| CN107953803A (en) * | 2017-12-25 | 2018-04-24 | 西南交通大学 | Flexible direct current tractive power supply system and its control method are pressed in one kind |
| CN207697541U (en) * | 2017-12-25 | 2018-08-07 | 西南交通大学 | Flexible direct current tractive power supply system is pressed in one kind |
| CN112803582A (en) * | 2021-03-23 | 2021-05-14 | 西南交通大学 | Alternating current-direct current hybrid subway power supply system and coordination control method thereof |
-
2021
- 2021-05-31 CN CN202110600766.3A patent/CN113300349A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904636A (en) * | 2014-02-28 | 2014-07-02 | 株洲变流技术国家工程研究中心有限公司 | Direct current tractive power supply system based on flexible direct current power transmission |
| CN204391761U (en) * | 2014-12-08 | 2015-06-10 | 深圳供电局有限公司 | Direct-flow distribution system is pressed in a kind of flexibility |
| AU2016101444A4 (en) * | 2015-08-11 | 2016-09-15 | Abb Schweiz Ag | DC traction power supply system, distributed DC power supply and a respective housing |
| CN107953803A (en) * | 2017-12-25 | 2018-04-24 | 西南交通大学 | Flexible direct current tractive power supply system and its control method are pressed in one kind |
| CN207697541U (en) * | 2017-12-25 | 2018-08-07 | 西南交通大学 | Flexible direct current tractive power supply system is pressed in one kind |
| CN112803582A (en) * | 2021-03-23 | 2021-05-14 | 西南交通大学 | Alternating current-direct current hybrid subway power supply system and coordination control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 赵畹君, 北京：中国电力出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107953803B (en) | Medium-voltage flexible direct-current traction power supply system and control method thereof | |
| CN113183766B (en) | Multi-source multi-system electric locomotive traction transmission system topology | |
| CN103904636B (en) | A kind of DC traction power-supply system based on flexible DC power transmission | |
| CN102328601A (en) | Energy-feedback tractive power supply system with high power factor and high cost performance | |
| CN112848976A (en) | Networked traction power supply system based on integration of three networks | |
| CN104786872A (en) | Cut-through type cophase power supply system for cascaded input-free and output-free transformers | |
| CN101348086B (en) | Pulsating direct current traction electric power supply system | |
| CN109204006A (en) | One kind being applied to attached wires of AC electrified railway Regenerated energy and utilizes system | |
| CN103241138B (en) | Low-frequency traction power supply system | |
| CN215398285U (en) | Networked traction power supply system based on integration of three networks | |
| CN112208346A (en) | Traction transmission power supply system of motor train unit | |
| CN110588449B (en) | Traction substation power supply structure and control method thereof | |
| CN109038630B (en) | Electric iron power supply system with energy storage auxiliary service function and control method | |
| CN218648579U (en) | Track traffic power supply system adopting bidirectional converter | |
| CN113300349A (en) | Subway traction power supply method and system | |
| CN214850480U (en) | Through type subway traction power supply system | |
| CN212323740U (en) | Comprehensive treatment device of urban rail transit traction power supply system | |
| CN209126537U (en) | System is utilized applied to attached wires of AC electrified railway Regenerated energy | |
| CN111146823B (en) | High-voltage direct-current urban rail transit traction power supply system | |
| CN115833211A (en) | Flexible direct current traction power supply system | |
| CN113895241A (en) | Traction transmission power supply system of three-phase motor train unit | |
| CN111355240B (en) | Rail transit power distribution network system, power supply system and regenerated energy inverter circuit | |
| CN201073937Y (en) | Pulsating dc traction power set | |
| CN110931222A (en) | Four-winding traction transformer device of flexible traction power supply system | |
| CN213676389U (en) | Traction transmission power supply system of motor train unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |