CN210133037U - Train traction power supply device and system - Google Patents

Abstract

The utility model provides a train pulls power supply unit and system, wherein the device includes: the system comprises a diode rectifier unit, a four-quadrant converter unit and a central controller; the diode rectifier unit, the four-quadrant converter unit and the central controller are connected with an alternating current power grid and a direct current contact network in parallel, the central controller is connected with the four-quadrant converter unit, and the central controller is used for adjusting output current of the four-quadrant converter unit according to voltage and current of the alternating current power grid and voltage of the direct current contact network. The utility model provides a train pulls power supply unit and system has richened train and has pulled power supply system's function.

Description

Train traction power supply device and system

Technical Field

The utility model relates to an urban rail transit draws power supply technical field, especially relates to a train draws power supply unit and system.

Background

Urban rail transit has the advantages of safety, comfort, large passenger capacity, high running speed, energy conservation, environmental protection and the like, and becomes a preferred scheme for solving the increasingly serious urban congestion problem, so that the urban rail transit is developed and constructed in many places in China at present. In some train traction power supply systems, a plurality of traction substations which are connected in parallel are arranged, and alternating current on the medium-voltage power grid side is converted into direct current to provide traction current for a train. However, because the energy of the diode rectifier unit in the traction substation can only flow in a single direction, the regenerative braking energy of the train cannot be fed back to the medium-voltage power grid for reuse, and huge waste of energy is caused.

In a part of train traction power supply systems in the prior art, a four-quadrant converter set connected with a diode rectifier set in parallel is added in a traction substation, so that when a train in which the traction substation is located is pulled, the diode rectifier set and the four-quadrant converter set work simultaneously, alternating current can be reduced in voltage and rectified to be converted into direct current, and the direct current is provided for the train; when the train is braked, the regenerative braking energy generated by the train is fed back to the medium-voltage power grid side by the four-quadrant converter set so as to improve the utilization efficiency of the train braking energy.

In addition to traction and braking, designers and operators of train traction power supply systems also want to assume more control functions, whereas the prior art train traction power supply systems are relatively single in function.

SUMMERY OF THE UTILITY MODEL

The utility model provides a train pulls power supply unit and system has richened train and has pulled power supply system's function.

The utility model provides a train pulls power supply unit, include: the system comprises a diode rectifier unit, a four-quadrant converter unit and a central controller;

the diode rectifier unit, the four-quadrant converter unit and the central controller are connected with an alternating current power grid and a direct current contact network in parallel, the central controller is connected with the four-quadrant converter unit, and the central controller is used for adjusting the output current of the four-quadrant converter unit according to the voltage and the current of the alternating current power grid and the voltage of the direct current contact network;

when the train traction power supply device is in a traction working condition, the diode rectifier unit and the four-quadrant converter unit convert alternating current of the alternating current power grid into direct current and output the direct current to the direct current contact network;

when the train traction power supply device is in a braking working condition, the four-quadrant converter set converts the direct current of the direct current contact network into alternating current to be output to the alternating current power grid;

when the train traction power supply device is in a reactive compensation working condition, the central controller controls the four-quadrant converter set to perform reactive compensation on the alternating current power grid according to the power factor of the alternating current power grid;

the central controller is further configured to receive an inversion instruction containing an ice melting current value sent by the ice melting control device, and switch the train traction power supply device to an inversion working condition according to the inversion instruction, so that an energy cycle is formed between a four-quadrant converter unit of the train traction power supply device, a section to be ice melted of a direct current catenary, a diode rectifier unit of the train traction power supply device adjacent to the section to be ice melted, and an alternating current power grid corresponding to the section to be ice melted, and the current of the section to be ice melted of the direct current catenary is not less than the ice melting current value.

In an embodiment of the present invention, the central controller is further configured to receive a rectification instruction containing an ice melting current value sent by the ice melting control device, and switch the train traction power supply device to a rectification operating condition according to the rectification instruction;

energy circulation is formed among a four-quadrant converter set of the train traction power supply device under the inversion working condition, a section to be ice-melted of a direct current catenary, a diode rectifier set of the train traction power supply device under the rectification working condition and an alternating current power grid corresponding to the section to be ice-melted, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

The utility model relates to an embodiment, when train traction power supply unit was in the reactive compensation operating mode, central controller specifically was used for, through the reactive power of the main transformer substation inlet wire department of AC electric network generated the reactive current instruction, to four-quadrant converter group sends the reactive current instruction, so that four-quadrant converter group is right AC electric network carries out reactive compensation.

The utility model discloses an in the embodiment, central controller is right the reactive power and the active power independent control of main transformer substation inlet wire department of alternating current electric network.

In an embodiment of the present invention, the diode rectifier set is a 24-pulse diode rectifier set, including: two rectifier transformers and four diode rectifier bridges.

In an embodiment of the present invention, the four-quadrant converter set includes: a double winding transformer and a four-quadrant converter.

An embodiment of the utility model provides a train pulls power supply system, include: the ice melting control device and the N train traction power supply devices;

the central controllers of the N train traction power supply devices are connected with the ice melting control device;

the ice melting control device is used for calculating an ice melting current value through the ice coating thickness and the environmental conditions of a direct current contact network, and sending an inversion signal to one train traction power supply device corresponding to the section to be melted, so that energy circulation is formed among a four-quadrant converter set of the train traction power supply device, the section to be melted of the direct current contact network, a diode rectifier set of the train traction power supply device adjacent to the section to be melted, and an alternating current power grid corresponding to the section to be melted, and the current of the section to be melted of the direct current contact network is not smaller than the ice melting current value.

In an embodiment of the present invention, the ice melting control device is further configured to send a rectification signal to another train traction power supply device corresponding to the section to be melted with ice;

energy circulation is formed among a four-quadrant converter set of the train traction power supply device under the inversion working condition, a section to be ice-melted of a direct current catenary, a diode rectifier set of the train traction power supply device under the rectification working condition and an alternating current power grid corresponding to the section to be ice-melted, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

In an embodiment of the present invention, the train traction power supply device is located at one side of the ice melting section, and the train traction power supply device is located at the other side of the ice melting section.

The utility model provides a train pulls power supply unit and system, wherein the device includes: the system comprises a diode rectifier unit, a four-quadrant converter unit and a central controller; the diode rectifier unit, the four-quadrant converter unit and the central controller are connected with an alternating current power grid and a direct current contact network in parallel, the central controller is connected with the four-quadrant converter unit, and the central controller is used for adjusting the output current of the four-quadrant converter unit according to the voltage and the current of the alternating current power grid and the voltage of the direct current contact network; when the train traction power supply device is in a traction working condition, the diode rectifier unit and the four-quadrant converter unit convert alternating current of an alternating current power grid into direct current and output the direct current to a direct current contact network; when the train traction power supply device is in a braking working condition, the four-quadrant converter set converts direct current of a direct current contact network into alternating current to be output to an alternating current power grid; when the train traction power supply device is in a reactive compensation working condition, the central controller controls the four-quadrant converter set to perform reactive compensation on the alternating current power grid according to the power factor of the alternating current power grid; the central controller is further used for receiving an inversion instruction containing an ice melting current value sent by the ice melting control device and switching the train traction power supply device to an inversion working condition according to the inversion instruction, so that energy circulation is formed among a four-quadrant converter set of the train traction power supply device, a section to be melted of a direct current catenary, a diode rectifier set of the train traction power supply device adjacent to the section to be melted and an alternating current power grid corresponding to the section to be melted, and the current of the section to be melted of the direct current catenary is not less than the ice melting current value. The utility model provides a train pulls power supply unit and system has richened train and has pulled power supply system's function. Specifically, the train traction power supply device and system provided by the embodiment can:

1. when the train traction power supply device is in a traction working condition, energy is provided for train operation;

2. when the train traction power supply device is in a braking working condition, the bidirectional transmission of energy can be realized, and redundant braking energy is fed back to an alternating current power grid for other loads to use, so that the energy conservation is realized;

3. when the power factor of the whole traction power supply system is low, the train traction power supply device is in a reactive compensation working condition, so that reactive power can be compensated, and the power factor meets the requirement;

4. when the contact network is covered with ice, the two train traction power supply devices in the section to be ice-melted are controlled to form a path between the alternating current power grid and the direct current contact network, so that ice melting is realized, an extra large-capacity direct current adjustable power supply is avoided, and harmonic pollution to the alternating current power grid is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a train traction power supply device of the present invention;

fig. 2 is a schematic view of the working principle of the train traction power supply device of the present invention under the traction condition;

FIG. 3 is a schematic view of the working principle of the train traction power supply device of the present invention under the braking condition;

fig. 4 is a schematic view of the working principle of the train traction power supply device of the present invention in the reactive compensation working condition;

fig. 5 is a schematic view of the working principle of the train traction power supply device of the present invention under the inversion condition;

FIG. 6 is a schematic diagram of the control principle of the train traction power supply apparatus of the present invention;

fig. 7 is a schematic structural diagram of the diode rectifier unit of the train traction power supply device of the present invention;

fig. 8 is a schematic structural view of a four-quadrant converter set of the train traction power supply device of the present invention;

fig. 9 is a schematic structural diagram of a train traction power supply system of the present invention;

fig. 10 is a schematic flow chart of a first embodiment of a train traction power supply system control method according to the present invention;

fig. 11 is a schematic flow chart of a second embodiment of the train traction power supply system control method of the present invention.

With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments. The technical solution of the present invention will be described in detail with specific examples. The following embodiments may be combined with each other and may not be described in detail in some embodiments for the same or similar concepts or processes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a schematic structural diagram of the train traction power supply device of the present invention. As shown in fig. 1, the embodiment of the present invention provides a train traction power supply device, which includes: the system comprises a diode rectifier unit, a four-quadrant converter unit and a central controller. The system comprises a diode rectifier unit, a four-quadrant converter unit, a central controller, an alternating current power grid and a direct current contact network, wherein the diode rectifier unit, the four-quadrant converter unit and the central controller are connected in parallel with the alternating current power grid and the direct current contact network; when the train traction power supply device is in a traction working condition, the diode rectifier unit and the four-quadrant converter unit convert alternating current of an alternating current power grid into direct current and output the direct current to a direct current contact network; when the train traction power supply device is in a braking working condition, the four-quadrant converter set converts direct current of a direct current contact network into alternating current to be output to an alternating current power grid; when the train traction power supply device is in a reactive compensation working condition, the central controller controls the four-quadrant converter set to perform reactive compensation on the alternating current power grid according to the power factor of the alternating current power grid; the central controller is further used for receiving an inversion instruction containing an ice melting current value sent by the ice melting control device and switching the train traction power supply device to an inversion working condition according to the inversion instruction, so that energy circulation is formed among a four-quadrant converter set of the train traction power supply device, a section to be melted of a direct current catenary, a diode rectifier set of the train traction power supply device adjacent to the section to be melted and an alternating current power grid corresponding to the section to be melted, and the current of the section to be melted of the direct current catenary is not less than the ice melting current value.

Specifically, in order to solve the problem that the train traction power supply system in the prior art is single in function, the train traction power supply device in this embodiment operates the diode rectifier unit and the four-quadrant converter unit in parallel, so as to simultaneously realize the functions of traction power supply, train regenerative braking energy feedback, reactive power compensation and overhead line system ice melting.

1. Fig. 2 is the utility model discloses the operating principle schematic diagram of train traction power supply unit when being in the operating mode of pulling. As shown in fig. 2, when a train needs to provide power near the train traction power supply device, the train traction is in a traction working condition, and the diode rectifier unit and the four-quadrant converter unit jointly provide energy for the train. The diode rectifier unit and the four-quadrant converter unit convert alternating current of an alternating current power grid into direct current and output the direct current to a direct current contact network, so that a train obtains traction energy through the direct current on the connected direct current contact network.

2. Fig. 3 is the working principle schematic diagram of the train traction power supply device in the braking working condition. As shown in fig. 3, when a train brakes near the train traction power supply device, the train traction power supply device starts a braking condition, and regenerative braking energy of the train can be fed back to the alternating current power grid for reuse through the four-quadrant converter set. The four-quadrant converter unit converts direct current of a direct current contact net into alternating current to be output to an alternating current power grid.

3. Fig. 4 is the utility model discloses the theory of operation schematic diagram when train pulls power supply unit and is located reactive compensation operating mode. As shown in fig. 4, when the power factor of the power supply system in which the train traction power supply device is located is low, the reactive power can be compensated by the four-quadrant converter set of the train traction power supply device, so that the power factor meets the requirement. In which the train traction power supply as in fig. 4 generates reactive power through the line cable capacitance. And optionally, the central controller of the train traction power supply device can control the four-quadrant converter to perform reactive compensation on the alternating current power grid according to the power factor of the alternating current power grid when the system is in a reactive compensation working condition.

4. Fig. 5 is the working principle schematic diagram of the train traction power supply device of the utility model when it is in the inversion working condition. As shown in fig. 5, when a certain section of a line of a dc link system near a train traction power supply device needs to melt ice, after the train traction power supply device receives an inversion instruction containing an ice melting current value sent by an ice melting control device in a system, the train traction power supply device is switched to an inversion working condition according to the inversion instruction, so that an energy cycle is formed between a four-quadrant converter set of the train traction power supply device in the inversion working condition, a section to be melted of the dc link system, a diode rectifier set of the train traction power supply device adjacent to the section to be melted, and an ac power grid corresponding to the section to be melted, that is, an energy cycle direction in an arrow direction shown in fig. 5. And the central controller also controls the current of the section to be de-iced of the direct current contact network to be not less than the de-icing current value sent by the de-icing control device. Optionally, the ice-melting current value may be a value calculated by the ice-melting control device according to monitoring information of a section to be ice-melted on the dc contact network, such as monitoring information of environmental conditions such as ice coating thickness, temperature, humidity, and the like.

Further, in the embodiment shown in fig. 5, the train traction power supply device in the inversion operating condition may further include a rectification operating condition in the train traction power supply device adjacent to the section to be melted with ice. Besides the working conditions, the central controller of the train traction power supply device can also receive a rectification instruction containing the ice melting current value sent by the ice melting control device, and switches the train traction power supply device to the rectification working condition according to the rectification instruction. Therefore, energy circulation is formed among the four-quadrant converter set of the train traction power supply device under the inversion working condition, the section to be ice-melted of the direct-current contact network, the diode rectifier set of the train traction power supply device under the rectification working condition and the alternating-current power grid corresponding to the section to be ice-melted. And the current of the section to be ice-melted between the train traction power supply device under the inversion working condition and the train traction power supply device under the rectification working condition is not less than the ice-melting current value sent by the ice-melting control device. Optionally, the ice-melting current value may be a required ice-melting current value calculated by the ice-melting control device according to the ice-coating thickness, the temperature, the humidity and other environmental conditions of the section to be ice-melted on the dc contact network.

In summary, the train traction power supply device provided by the embodiment of the present application can convert the ac power of the ac power grid into the dc power to be output to the dc contact network by the diode rectifier unit and the four-quadrant converter unit when the train traction power supply device is in the traction condition; when the train traction power supply device is in a braking working condition, the four-quadrant converter set converts direct current of a direct current contact network into alternating current to be output to an alternating current power grid; when the train traction power supply device is in a reactive compensation working condition, the central controller controls the four-quadrant converter set to perform reactive compensation on the alternating current power grid according to the power factor of the alternating current power grid; the central controller is further used for receiving an inversion instruction containing an ice melting current value sent by the ice melting control device and switching the train traction power supply device to an inversion working condition according to the inversion instruction, so that energy circulation is formed among a four-quadrant converter set of the train traction power supply device, a section to be melted of a direct current catenary, a diode rectifier set of the train traction power supply device adjacent to the section to be melted and an alternating current power grid corresponding to the section to be melted, and the current of the section to be melted of the direct current catenary is not less than the ice melting current value. Thereby can realize following technological effect simultaneously: 1. when the train traction power supply device is in a traction working condition, energy is provided for train operation; 2. when the train traction power supply device is in a braking working condition, the bidirectional transmission of energy can be realized, and redundant braking energy is fed back to an alternating current power grid for other loads to use, so that the energy conservation is realized; 3. when the power factor of the whole traction power supply system is low, the train traction power supply device is in a reactive compensation working condition, so that reactive power can be compensated, and the power factor meets the requirement; 4. when the contact network is covered with ice, the two train traction power supply devices in the section to be ice-melted are controlled to form a path between the alternating current power grid and the direct current contact network, so that ice melting is realized, an extra large-capacity direct current adjustable power supply is avoided, and harmonic pollution to the alternating current power grid is reduced.

Further, in the above embodiment, when the train traction power supply device is in the reactive compensation working condition, the central controller is specifically configured to generate a reactive current instruction through reactive power at an inlet line of the ac power grid main substation, and send the reactive current instruction to the four-quadrant converter group of the train traction power supply device, so that the four-quadrant converter group performs reactive compensation on the ac power grid. For example: in one embodiment, it may be understood that reactive compensation is performed on the ac power grid by using a four-quadrant converter set, and in a specific implementation process, the reactive compensation may be performed by using a zero-power-factor pure inductive operation (equivalently, an inductance with an adjustable bat value) or a zero-power-factor pure capacitive operation (equivalently, an amplitude-adjustable capacitor) of the four-quadrant converter set to compensate for an influence of a capacitive load or an inductive load on the ac power grid power factor. The determination may be performed by writing control logic for reactive power compensation in the controller, or may be performed according to preset quantization data, which is not limited herein.

Optionally, in the above embodiment, the central controller independently controls reactive power and active power at a main substation incoming line of the ac power grid. Specifically, fig. 6 is a schematic diagram of the control principle of the train traction power supply device of the present invention. In the train traction power supply apparatus shown in fig. 6, the current closed-loop control method of the four-quadrant converter set realizes independent control of active power and reactive power by using current decoupling control based on a synchronous rotating coordinate system. Specifically, detecting and detecting an alternating voltage, and performing phase locking on the alternating voltage to obtain a power grid voltage synchronization angle theta; converting three-phase current into two-phase current id and iq by utilizing coordinate transformation, wherein id represents active current, and iq represents reactive current so as to realize independent control of active power and reactive power; the active current instruction is calculated by detecting the voltage of a direct current contact network and performing PI closed-loop control; the reactive current command is calculated by receiving the command from SCADA via the central controllerThe reactive power value at the inlet wire of the main transformer station is calculated by the following formula

Wherein Ed is the value of the secondary side voltage of the transformer under a synchronous coordinate system; the output of the d-axis PI control and the q-axis PI control is used for modulation, and six paths of driving pulses are generated.

Optionally, in each of the foregoing embodiments, the diode rectifier unit is a 24-pulse diode rectifier unit, and includes: two rectifier transformers and four diode rectifier bridges. Specifically, fig. 7 is a schematic structural diagram of the diode rectifier unit of the train traction power supply device of the present invention. Wherein, the primary windings of the two three-winding phase-shifting transformers are connected in an edge-extending triangle manner and respectively shift the phase by +7.5 degrees and-7.5 degrees; the secondary sides are respectively connected in a star shape and an angle shape; the transformer reduces the high-voltage alternating voltage to the alternating voltage required by the diode rectifier; the direct current sides of the diode rectifiers are connected in parallel. The diode rectifier unit supplies power to the train when the train is in traction and does not work when the train is in braking.

Optionally, in each of the above embodiments, the four-quadrant converter set includes: a double winding transformer and a four-quadrant converter. Specifically, fig. 8 is a schematic structural diagram of the four-quadrant converter set of the train traction power supply device of the present invention. The four-quadrant converter adopts an isolated dual main circuit, namely a multi-winding transformer is adopted to isolate the alternating current sides of the PWM rectifiers from each other; the primary sides of the transformers are connected in a star shape, and the secondary sides of the transformers are connected in a triangular shape; the transformer reduces the high voltage ac voltage to the ac voltage required by the four-quadrant converter.

Fig. 9 is a schematic structural diagram of the train traction power supply system of the present invention. As shown in fig. 9, the train traction power supply system provided in the embodiment of the present application includes: the ice melting control device and the N train traction power supply devices in any one of the embodiments. The central controllers of the N train traction power supply devices are connected with the ice melting control device; the ice melting control device is used for calculating an ice melting current value through the ice coating thickness and the environmental conditions of the direct current contact network and sending an inversion signal to a train traction power supply device corresponding to the section to be melted, so that energy circulation is formed among a four-quadrant converter set of the train traction power supply device, the section to be melted of the direct current contact network, a diode rectifier set of the train traction power supply device adjacent to the section to be melted and an alternating current power grid corresponding to the section to be melted, and the current of the section to be melted of the direct current contact network is not less than the ice melting current value.

Specifically, when a certain section of a line of a direct current contact network in a train traction power supply system needs to melt ice, the ice melting control device calculates a required ice melting current value according to monitoring information of the section to be melted on the direct current contact network, such as monitoring information of environmental conditions such as ice coating thickness, temperature, humidity and the like. The ice melting control device sends an inversion instruction containing an ice melting current value to a central controller of any train traction power supply device beside a section to be melted, as shown in fig. 9, and enables the train power supply device receiving the inversion instruction to switch the train traction power supply device to an inversion working condition according to the inversion instruction, so that an energy cycle is formed between a four-quadrant converter set of the train traction power supply device in the inversion working condition, the section to be melted of a direct current catenary, a diode rectifier set of the train traction power supply device adjacent to the section to be melted, and an alternating current power grid corresponding to the section to be melted, namely, an energy cycle direction in an arrow direction shown in fig. 5 is formed. And the central controller of the train power supply device receiving the inversion instruction further controls the current of the section to be ice-melted of the direct-current overhead contact system to be not less than the ice-melting current value sent by the ice-melting control device.

Further, in the above embodiment, the ice melting control device sends an inversion instruction including an ice melting current value to the central controller of any one of the train traction power supply devices, and also sends a rectification instruction including an ice melting current value to a train traction power supply device on the other side of the section to be melted, which is adjacent to the train traction power supply device on the inversion working condition of the section to be melted, of the train traction power supply device. And the train traction power supply device receiving the rectification instruction switches the train traction power supply device to the rectification working condition according to the rectification instruction.

Therefore, through the two train traction power supply devices under the inversion working condition and the rectification working condition, energy circulation is formed between the four-quadrant converter set of the train traction power supply device under the inversion working condition, the section to be ice-melted of the direct-current contact network, the diode rectifier set of the train traction power supply device under the rectification working condition and an alternating-current power grid corresponding to the section to be ice-melted. And the current of the section to be ice-melted between the train traction power supply device under the inversion working condition and the train traction power supply device under the rectification working condition is not less than the ice-melting current value sent by the ice-melting control device.

Fig. 10 is a schematic flow chart of a first embodiment of the control method of the train traction power supply system of the present invention. As shown in fig. 10, the train traction power supply system control method provided in this embodiment is implemented in the above system, where the method includes:

s1001: and calculating the ice melting current value through the ice coating thickness of the direct current contact network and the environmental conditions.

S1002: and sending an inversion signal to one train traction power supply device corresponding to the section to be ice-melted so as to enable an energy cycle to be formed between a four-quadrant converter set of the train traction power supply device, the section to be ice-melted of a direct current contact network, a diode rectifier set of the train traction power supply device adjacent to the section to be ice-melted and an alternating current power grid corresponding to the section to be ice-melted, wherein the current of the section to be ice-melted of the direct current contact network is not less than the ice-melting current value.

The train traction power supply system control method provided in this embodiment is implemented in the train traction power supply system shown in fig. 9, and the implementation manner and principle thereof are the same, and reference may be made to the foregoing embodiment, which is not described again.

Further, fig. 11 is a schematic flow chart of a second embodiment of the train traction power supply system control method of the present invention. The embodiment shown in fig. 11 is based on the embodiment shown in fig. 10, and after S1002, further includes:

s1003: and sending a rectification signal to the other train traction power supply device corresponding to the section to be ice-melted so as to enable energy circulation to be formed among a four-quadrant converter set of the train traction power supply device under the inversion working condition, the section to be ice-melted of a direct current catenary, a diode rectifier set of the train traction power supply device under the rectification working condition and an alternating current power grid corresponding to the section to be ice-melted, wherein the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

The train traction power supply system control method provided in this embodiment is implemented in the train traction power supply system shown in fig. 9, and the implementation manner and principle thereof are the same, and reference may be made to the foregoing embodiment, which is not described again.

An embodiment of the present invention further provides an electronic device, including:

a processor; and a memory for storing executable instructions for the processor;

wherein the processor is configured to execute the train traction power supply system control method in any one of the above embodiments via execution of executable instructions.

An embodiment of the present invention further provides a storage medium, including: the control method comprises a readable storage medium and a computer program, wherein the computer program is stored on the readable storage medium and is used for realizing the control method of the train traction power supply system in the above embodiments.

An embodiment of the present invention further provides a program product, which includes:

a computer program (i.e., executing instructions) stored in a readable storage medium. The computer program can be read from a readable storage medium by at least one processor of the encoding apparatus, and the computer program can be executed by the at least one processor to enable the encoding apparatus to implement the train traction power supply system control method provided by the foregoing various embodiments.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A train traction power supply, comprising: the system comprises a diode rectifier unit, a four-quadrant converter unit and a central controller;

the diode rectifier unit, the four-quadrant converter unit and the central controller are connected with an alternating current power grid and a direct current contact network in parallel, the central controller is connected with the four-quadrant converter unit, and the central controller is used for adjusting the output current of the four-quadrant converter unit according to the voltage and the current of the alternating current power grid and the voltage of the direct current contact network;

when the train traction power supply device is in a traction working condition, the diode rectifier unit and the four-quadrant converter unit convert alternating current of the alternating current power grid into direct current and output the direct current to the direct current contact network;

when the train traction power supply device is in a braking working condition, the four-quadrant converter set converts the direct current of the direct current contact network into alternating current to be output to the alternating current power grid;

when the train traction power supply device is in a reactive compensation working condition, the central controller controls the four-quadrant converter set to perform reactive compensation on the alternating current power grid according to the power factor of the alternating current power grid;

the central controller is further configured to receive an inversion instruction containing an ice melting current value sent by the ice melting control device, and switch the train traction power supply device to an inversion working condition according to the inversion instruction, so that an energy cycle is formed between a four-quadrant converter unit of the train traction power supply device, a section to be ice melted of a direct current catenary, a diode rectifier unit of the train traction power supply device adjacent to the section to be ice melted, and an alternating current power grid corresponding to the section to be ice melted, and the current of the section to be ice melted of the direct current catenary is not less than the ice melting current value.

2. The apparatus of claim 1,

the central controller is also used for receiving a rectification instruction which is sent by the ice melting control device and contains an ice melting current value, and switching the train traction power supply device to a rectification working condition according to the rectification instruction;

energy circulation is formed among a four-quadrant converter set of the train traction power supply device under the inversion working condition, a section to be ice-melted of a direct current catenary, a diode rectifier set of the train traction power supply device under the rectification working condition and an alternating current power grid corresponding to the section to be ice-melted, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

3. The device according to claim 1 or 2,

when the train traction power supply device is in a reactive compensation working condition, the central controller is specifically configured to generate a reactive current instruction through reactive power at an incoming line of a main substation of the alternating current power grid, and send the reactive current instruction to the four-quadrant converter set, so that the four-quadrant converter set performs reactive compensation on the alternating current power grid.

4. The apparatus of claim 3,

and the central controller independently controls reactive power and active power at the inlet wire of a main transformer station of the alternating current power grid.

5. The apparatus of claim 3,

the diode rectifier unit is 24 pulse wave diode rectifier units, includes: two rectifier transformers and four diode rectifier bridges.

6. The apparatus of claim 3,

the four-quadrant converter set comprises: a double winding transformer and a four-quadrant converter.

7. A train traction power supply system, comprising: an ice melting control device and N train traction power supply devices according to any one of claims 1-6;

and the central controllers of the N train traction power supply devices are connected with the ice melting control device.

8. The system of claim 7,

the ice melting control device is used for calculating an ice melting current value through the ice coating thickness and the environmental conditions of a direct current contact network, and sending an inversion signal to one train traction power supply device corresponding to the section to be melted, so that energy circulation is formed among a four-quadrant converter set of the train traction power supply device, the section to be melted of the direct current contact network, a diode rectifier set of the train traction power supply device adjacent to the section to be melted, and an alternating current power grid corresponding to the section to be melted, and the current of the section to be melted of the direct current contact network is not smaller than the ice melting current value.

9. The system of claim 8,

the ice melting control device is also used for sending a rectification signal to the other train traction power supply device corresponding to the section to be melted;

energy circulation is formed among a four-quadrant converter set of the train traction power supply device under the inversion working condition, a section to be ice-melted of a direct current catenary, a diode rectifier set of the train traction power supply device under the rectification working condition and an alternating current power grid corresponding to the section to be ice-melted, and the current of the section to be ice-melted of the direct current catenary is not less than the ice-melting current value.

10. The system of claim 9, wherein said one train traction power supply is located on one side of said ice melt section and said another train traction power supply is located on the other side of said ice melt section.

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