CN214850480U - Through type subway traction power supply system - Google Patents
Through type subway traction power supply system Download PDFInfo
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- CN214850480U CN214850480U CN202121191370.XU CN202121191370U CN214850480U CN 214850480 U CN214850480 U CN 214850480U CN 202121191370 U CN202121191370 U CN 202121191370U CN 214850480 U CN214850480 U CN 214850480U
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Abstract
The through-type subway traction power supply system comprises a step-down transformer for reducing the voltage grade of three-phase alternating current 110KV/220KV, and is characterized in that: the three-phase-three-Hunan alternating-current power supply is rectified into a converter valve circuit of a medium-voltage direct-current power supply and a DC/DC chopper circuit for supplying power to the train, the input end of the step-down transformer is connected with an urban power grid, the output end of the step-down transformer is connected with the input end of the converter valve circuit, the output end of the converter valve circuit is connected with the input end of the DC/DC chopper circuit, and the output end of the DC/DC chopper circuit is connected with a subway traction contact net. The utility model discloses carry the same electric power used wire rod of direct current transmission and less than the used wire rod of alternating current transmission, reduce the transmission of electricity cost, make the direct current of output be close to ideal direct current, equipment changes less and maintains and realize the high-efficient utilization of regenerative braking energy.
Description
Technical Field
The utility model relates to a through subway pulls power supply system belongs to subway and pulls power supply technical field.
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.
SUMMERY OF THE UTILITY MODEL
The utility model provides a through subway pulls power supply system carries the same electric power used wire rod of direct current transmission and uses less than the used wire rod of alternating current transmission, reduces the transmission of electricity cost, makes the direct current of output close to ideal direct current, and equipment changes less and maintains and realizes the high-efficient utilization of regenerative braking energy.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the through-type subway traction power supply system comprises a step-down transformer for reducing the voltage grade of three-phase alternating current 110KV/220KV, and is characterized in that: the three-phase-three-Hunan alternating-current power supply is rectified into a converter valve circuit of a medium-voltage direct-current power supply and a DC/DC chopper circuit for supplying power to the train, the input end of the step-down transformer is connected with an urban power grid, the output end of the step-down transformer is connected with the input end of the converter valve circuit, the output end of the converter valve circuit is connected with the input end of the DC/DC chopper circuit, and the output end of the DC/DC chopper circuit is connected with a subway traction contact net.
Preferably, the converter valve circuit comprises three parallel converter valve bridge arms, and the input end of each converter valve bridge is connected with one output end of the step-down transformer.
Preferably, 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.
Preferably, the positive and negative direct-current buses at the output end of the converter valve bridge arm are respectively connected with a direct-current transmission cable through a control switch, and 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.
Preferably, the DC/DC chopper circuit is arranged in a traction substation matched with a subway station and comprises a DC/DC chopper, the input end of the DC/DC chopper is connected with a direct-current transmission cable through a control switch, and the output end of the DC/DC chopper is connected with a subway traction overhead line system.
Preferably, the DC/DC chopper is a bidirectional DC/DC chopper capable of realizing bidirectional energy flow through voltage boosting/reducing conversion.
Preferably, the step-down transformer is a multi-winding transformer, and is arranged in a main substation configured according to a subway line.
The utility model has the advantages that:
the utility model discloses a step-down transformer is connected with the city electric wire netting among the through subway traction power supply system, the three-phase interchange 110KV 220KV of city electric wire netting becomes suitable voltage class through reducing the transformer step-down, the DC power supply of DC10kV or 35kV is rectified into with three-phase ac power supply to rethread converter valve circuit, then through DC/DC chopper circuit with DC10kV or 35 kV's direct current step-down to DC1500V, 750V or 3000V's direct current and input subway traction contact net for the train power supply again. A converter valve circuit is used for rectifying a three-phase alternating current power supply into a DC10kV or 35kV 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.
The converter valve circuit suppresses ripples in the rectified voltage by using a smoothing reactor, so that the output direct current is close to the ideal direct current. The DC/DC chopper circuit of the traction substation in a certain section boosts the regenerative braking energy of a DC1500V, 750V or 3000V bus to a DC10kV or 35kV input direct-current transmission cable according to the network voltage condition when the train in the certain section is in a braking working condition, so that the regenerative braking energy can be efficiently utilized by other sections.
Drawings
Fig. 1 is the utility model discloses a through subway pulls power supply system's block diagram.
Fig. 2 is a schematic diagram of a power supply principle of a through-type subway traction power supply system.
Fig. 3 is a schematic diagram of the principle of the through-type subway traction power supply system for realizing the utilization of regenerative braking energy.
Detailed Description
The following describes embodiments of the present invention in detail with reference to fig. 1 to 3.
The through-type subway traction power supply system comprises a step-down transformer for reducing the voltage grade of three-phase alternating current 110KV/220KV, and is characterized in that: the three-phase-three-Hunan alternating-current power supply is rectified into a converter valve circuit of a medium-voltage direct-current power supply and a DC/DC chopper circuit for supplying power to the train, the input end of the step-down transformer is connected with an urban power grid, the output end of the step-down transformer is connected with the input end of the converter valve circuit, the output end of the converter valve circuit is connected with the input end of the DC/DC chopper circuit, and the output end of the DC/DC chopper circuit is connected with a subway traction contact net.
The step-down transformer in the through type subway traction power supply system is connected with an urban power grid, the three-phase alternating current 110KV/220KV of the urban power grid is reduced to a proper voltage level through the step-down transformer, then the three-phase alternating current power supply is rectified into a DC10kV or 35kV direct current power supply through the converter valve circuit, and then the DC10kV or 35kV direct current is reduced to DC1500V, 750V or 3000V direct current through the DC/DC chopper circuit and is input into a subway traction contact network to supply power to a train. A converter valve circuit is used for rectifying a three-phase alternating current power supply into a DC10kV or 35kV 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.
The converter valve circuit comprises three parallel converter valve bridge arms, and the input end of each converter valve bridge is connected with one output end of the step-down transformer. The bridge arm of the converter valve is formed by taking a thyristor as a core device, and the three-phase alternating current power supply is rectified into a direct current power supply of DC10kV or 35 kV.
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. 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 DC/DC chopper circuit is arranged in a traction substation matched with a subway station and comprises a DC/DC chopper, wherein the input end of the DC/DC chopper is connected with a direct-current transmission cable through a control switch, and the output end of the DC/DC chopper is connected with a subway traction contact network. The DC/DC chopper is a bidirectional DC/DC chopper which can realize bidirectional energy flow through voltage boosting/reducing conversion. A step-down transformer is not needed in the DC/DC chopper circuit, equipment is few and easy to maintain, and the DC/DC chopper circuit has the functions of output voltage regulation and energy bidirectional conversion. As shown in FIG. 1, when the trains in each section are in the traction working condition, each DC/DC chopper circuit steps down the DC10kV or 35kV DC power supply to DC1500V, 750V or 3000V DC to provide the electric power for the vehicles. As shown in fig. 2, when a train in a certain section is in a braking condition, a DC/DC chopper circuit of the traction substation in the section boosts regenerative braking energy of a DC1500V, 750V or 3000V bus to a DC10kV or 35kV input direct current transmission cable according to a network voltage condition, so as to be used by traction loads in other sections, thereby realizing efficient utilization of the regenerative braking energy.
The step-down transformer is a multi-winding transformer to adapt to the pulse number of the rectifying circuit, is arranged in a main substation configured according to a subway line, and is convenient for centralized management in the main substation.
The technical solutions of the embodiments of the present invention are completely 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Claims (7)
1. The through-type subway traction power supply system comprises a step-down transformer for reducing the voltage grade of three-phase alternating current 110KV/220KV, and is characterized in that: the three-phase-three-Hunan alternating-current power supply is rectified into a converter valve circuit of a medium-voltage direct-current power supply and a DC/DC chopper circuit for supplying power to the train, the input end of the step-down transformer is connected with an urban power grid, the output end of the step-down transformer is connected with the input end of the converter valve circuit, the output end of the converter valve circuit is connected with the input end of the DC/DC chopper circuit, and the output end of the DC/DC chopper circuit is connected with a subway traction contact net.
2. A through-type subway traction power supply system according to claim 1, characterized in that: the converter valve circuit comprises three parallel converter valve bridge arms, and the input end of each converter valve bridge is connected with one output end of the step-down transformer.
3. A through-type subway traction power supply system according to claim 2, characterized in that: 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.
4. A through-type subway traction power supply system according to claim 2, characterized in that: and the positive and negative direct-current buses at the output end of the converter valve bridge arm are respectively connected with a direct-current transmission cable through a control switch, and 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.
5. A through type subway traction power supply system according to claim 4, characterized in that: the DC/DC chopper circuit is arranged in a traction substation matched with a subway station and comprises a DC/DC chopper, wherein the input end of the DC/DC chopper is connected with a direct-current transmission cable through a control switch, and the output end of the DC/DC chopper is connected with a subway traction contact network.
6. A through type subway traction power supply system according to claim 5, characterized in that: the DC/DC chopper is a bidirectional DC/DC chopper which can realize bidirectional energy flow through voltage boosting/reducing conversion.
7. A through-type subway traction power supply system according to claim 1, characterized in that: the step-down transformer is a multi-winding transformer and is arranged in a main substation configured according to a subway line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121191370.XU CN214850480U (en) | 2021-05-31 | 2021-05-31 | Through type subway traction power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121191370.XU CN214850480U (en) | 2021-05-31 | 2021-05-31 | Through type subway traction power supply system |
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| Publication Number | Publication Date |
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| CN214850480U true CN214850480U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121191370.XU Active CN214850480U (en) | 2021-05-31 | 2021-05-31 | Through type subway traction power supply system |
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| CN (1) | CN214850480U (en) |
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2021
- 2021-05-31 CN CN202121191370.XU patent/CN214850480U/en active Active
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