CN214355986U

CN214355986U - Direct-current medium-voltage trolley alternating-current variable-frequency traction electric locomotive

Info

Publication number: CN214355986U
Application number: CN202023273072.3U
Authority: CN
Inventors: 王大利
Original assignee: Qinhuangdao Tiantuo Electric Locomotive Co ltd
Current assignee: Qinhuangdao Tiantuo Electric Locomotive Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-10-08
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a direct current medium voltage stringing type alternating current variable frequency traction electric locomotive, which comprises a locomotive distribution room, wherein a cabinet body is arranged inside the locomotive distribution room, a plurality of frequency converters are arranged inside the cabinet body, one side inside the locomotive distribution room is provided with a control system, the control system is respectively connected with the frequency converters, one side outside the locomotive distribution room is uniformly provided with a plurality of motors, one side inside the locomotive distribution room is provided with a direct current reactor, the direct current reactor is respectively connected with the frequency converters, one side of the direct current reactor inside the locomotive distribution room is provided with a direct current filter device, the direct current filter device is connected with the direct current reactor, and a stringing bow is arranged outside the locomotive distribution room; the utility model has the advantages of the speed governing is steady, start-up moment increase 300%, reduce electrical equipment and maintain work load 80%, extension motor life 10 times, reduce and maintain electric expense 85%, easy and simple to handle, the security performance improves, energy-conservation reaches 35%.

Description

Direct-current medium-voltage trolley alternating-current variable-frequency traction electric locomotive

Technical Field

The utility model relates to a special track pulls transportation equipment technical field in mine specifically is a direct current middling pressure overhead line formula exchanges variable frequency traction electric locomotive.

Background

The electric locomotive is a traction device for rail vehicle transportation, and the power is to drive wheels to rotate by using a traction motor, so that the locomotive runs on a rail by means of the friction between the wheels and a rail surface. In this mode of operation, the traction force is limited not only by the power of the traction motor (or internal combustion engine), but also by the friction between the wheels and the rail surface. The gradient of the locomotive capable of running during transportation is limited, the gradient of a transportation track is generally 3 per thousand, and the local gradient cannot exceed 30 per thousand. It is classified into trolley locomotives and storage battery electric locomotives by structure.

The defects of the prior art are as follows:

the traction motor of the original mine medium-voltage trolley type direct-current resistance speed-regulating electric locomotive is a direct-current series-excited motor, the starting torque is small, the energy consumption is large, and the efficiency is 65 percent at most. In recent one hundred years, a direct current transmission motor with complex structure, high cost, poor moisture resistance, high failure rate and high maintenance cost is adopted. At present, most of electric locomotive speed regulating systems in China still use an original resistance voltage reduction speed regulating mode, and the contact type resistance speed regulating locomotive is large in maintenance amount and high in electric energy waste due to resistance operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a direct current middling pressure overhead line formula exchanges frequency conversion traction electric locomotive to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a direct current middling pressure overhead line formula AC frequency conversion traction electric locomotive, includes the locomotive electricity distribution room, the locomotive electricity distribution room inside is provided with the cabinet body, the internal portion of cabinet is provided with a plurality of converters, locomotive electricity distribution room inside one side is provided with control system, control system is connected with a plurality of converters respectively, the outside one side of locomotive electricity distribution room evenly is provided with a plurality of motors, the inside one side of locomotive electricity distribution room is provided with the DC reactor, the DC reactor is connected with a plurality of converters respectively, the locomotive electricity distribution room is inside to be provided with DC filter device in DC reactor one side, DC filter device is connected with the DC reactor, locomotive electricity distribution room outside is provided with the overhead line bow, overhead line bow one side is provided with the electric wire netting, DC filter device passes through the overhead line bow and is connected with the electric wire netting.

Preferably, the number of the plurality of frequency converters is three.

Preferably, the number of the plurality of motors is six.

Preferably, the frequency converters are respectively connected with the two motors.

Preferably, the motors are asynchronous alternating current motors and are connected with the locomotive travelling shaft through a speed reducer.

Preferably, the incoming line of the front ends of the frequency converters is controlled by silicon controlled rectifier.

Preferably, the frequency converters are cooled by adopting a heat pipe forced air cooling mode.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses cancel speed governing resistance, can reach electrodeless speed governing, at the start-up speed governing period, power saving energy consumption% pulls the converter through adopting and makes the locomotive have stronger traction force under the same adhesion condition based on position high performance DSP chip high accuracy torque DTC control scheme, strong adaptability under adverse circumstances, and use through each automatically controlled structure makes this control system have various protect function, such as ground protection, overload protection, short-circuit protection, locked rotor protection, open-phase protection etc. can the effectual protection motor; the control system can enable the running generator to be in a power generation state when detecting that the voltage of the main bus is reduced in operation, can maintain normal running even in the power loss state, is stepless speed regulation, is uniform in speed regulation, can give the speed at the lowest frequency of 1Hz, and can increase and decrease the speed of the traction motor according to the given frequency of the speed regulation handle and set the highest speed at the same time. Even if the locomotive is in a downhill or light load condition, the runaway phenomenon cannot be caused. The control system can avoid misoperation, for example, when a driver suddenly increases to the highest speed after zero-speed starting, the frequency rising time of the variable-frequency speed regulator is set to 45 seconds, and the locomotive can reach the highest speed after seconds. Therefore, the impact of sudden acceleration on the gear can be effectively avoided, and the service life of the gear is prolonged to the maximum extent.

2. The utility model discloses based on six quick-witted drive control modes, realize that six motor rotational speeds are synchronous. The control system realizes the whole-course rotating speed control of the motor, the rotating speed of the traction motor is still controlled by the variable-frequency speed regulator even if the locomotive runs on a downhill, the highest speed limit can be set, the electric energy consumption braking energy of the locomotive continuously offsets the acceleration generated by gravity, accidents such as overspeed runaway, vehicle sliding and the like are avoided, the use times of air braking and the starting times of the variable-frequency motor are reduced, and therefore the abrasion of a brake shoe and a wheel pair and the fault of the variable-frequency motor are reduced.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

fig. 2 is a circuit diagram of the present invention.

In the figure: 1. a locomotive power distribution room; 2. a cabinet body; 3. a frequency converter; 4. a control system; 5. a motor; 6. a direct current reactor; 7. a direct current filter device; 8. stringing a bow; 9. and (4) a power grid.

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.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a direct current middling pressure overhead line formula alternating current frequency conversion traction electric locomotive, including locomotive electricity distribution room 1, the inside cabinet body 2 that is provided with of locomotive electricity distribution room 1, the inside a plurality of converters 3 that is provided with of cabinet body 2, the inside one side of locomotive electricity distribution room 1 is provided with control system 4, control system 4 is connected with a plurality of converters 3 respectively, 1 outside one side of locomotive electricity distribution room evenly is provided with a plurality of

motors

5, 1 inside one side of locomotive electricity distribution room is provided with direct current reactor 6, direct current reactor 6 is connected with a plurality of converters 3 respectively, 1 inside direct current reactor 6 one side in locomotive electricity distribution room is provided with direct current filter 7, direct current filter 7 is connected with direct

current reactor

6, 1 outside of locomotive electricity distribution room is provided with overhead line bow 8, overhead line bow 8 one side is provided with electric wire netting 9, direct current filter 7 is connected with electric wire netting 9 through overhead line bow 8.

Through the scheme, the driving and power supply structure of the electric locomotive is formed by the structure.

In this embodiment, preferably, the number of the plurality of frequency converters 3 is three.

Through the scheme, six independent motors 5 are respectively controlled by three frequency converters 3.

In this embodiment, it is preferable that the number of the plurality of motors 5 is six.

Through the scheme, the motors 5 with the number of six are respectively independent and are matched with the frequency converters 3 for use.

In this embodiment, preferably, the plurality of frequency converters 3 are respectively connected to the two motors 5.

By means of the above-described solution, the use of the motor 5 is regulated by the use of the frequency converter 3.

In this embodiment, preferably, the plurality of motors 5 are asynchronous ac motors 5, and the plurality of motors 5 are connected to the locomotive running shaft through a speed reducer.

Through the scheme, the electric locomotive is driven through the connection of the motor 5 and the locomotive running shaft.

In this embodiment, preferably, the incoming lines of the front ends of the plurality of frequency converters 3 are controlled by thyristors.

Through the scheme, when the locomotive is in line changing and is just connected with a power supply, a certain voltage difference exists between the voltage of the power grid 9 and the frequency converter 3, the charging current at the moment can be reduced by adopting silicon controlled rectifier control on the inlet wire at the front end of the frequency converter 3, and the impact on the power grid 9 is reduced.

In this embodiment, preferably, the plurality of frequency converters 3 are heat-dissipated by adopting a heat pipe forced air cooling heat dissipation method.

The working principle of the utility model is as follows:

the medium-voltage stringing type alternating current variable frequency traction electric locomotive is mainly driven by six motors 5, each motor 5 is independent, alternating current is provided by an electric network 9 connected through a stringing bow 8 and is supplied with power after rectification, a direct current filter device 7 is arranged to enable the output waveform to be more stable, an incoming direct current reactor 6 is connected between the stringing bow 8 and a plurality of frequency converters 3, the frequency converters 3 are arranged in a cabinet body 2 and are used for heat dissipation in a heat pipe forced air cooling heat dissipation mode, the cabinet body 2 is arranged in a locomotive distribution chamber 1, the motor 5 is an asynchronous alternating current motor 5, the rated voltage is 1140V, the power is 330KW, the running shaft of the locomotive is connected with a speed reducer, the six motors 5 require synchronous speed when running, the output torque difference is smaller, the problem that the motor 5 is out of step to cause fault parking or equipment damage is reduced, and a certain voltage difference exists between the voltage of the electric network 9 and the frequency converters 3 when the line of the locomotive is changed and the power supply is just switched on, in order to reduce the charging current and the impact on a power grid 9, the inlet wire at the front end of the frequency converter 3 is controlled by silicon controlled rectifier, in order to reduce the speed and torque difference between the six motors 5, a control system 4 is used for controlling the six motors 5, the frequency converter 3 is divided into three power units, the three power units are controlled by the control system 4, each power unit is respectively connected with two motors 5, the power of each power unit is 1.5 times that of the two motors 5, the total power of equipment of the frequency converter 3 is 2700KW, and the heat dissipation adopts a heat pipe forced air cooling heat dissipation mode.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a direct current middling pressure overhead line formula exchanges frequency conversion traction electric locomotive, includes locomotive electricity distribution room (1), its characterized in that: a cabinet body (2) is arranged in the locomotive power distribution room (1), a plurality of frequency converters (3) are arranged in the cabinet body (2), a control system (4) is arranged on one side in the locomotive power distribution room (1), the control system (4) is respectively connected with the frequency converters (3), a plurality of motors (5) are uniformly arranged on one side outside the locomotive power distribution room (1), a direct current reactor (6) is arranged on one side in the locomotive power distribution room (1), the direct current reactor (6) is respectively connected with the frequency converters (3), a direct current filter device (7) is arranged on one side of the direct current reactor (6) in the locomotive power distribution room (1), the direct current filter device (7) is connected with the direct current reactor (6), a wire erecting bow (8) is arranged outside the locomotive power distribution room (1), and a power grid (9) is arranged on one side of the wire erecting bow (8), the direct current filtering device (7) is connected with a power grid (9) through a stringing bow (8).

2. The direct current medium voltage trolley alternating current variable frequency traction electric locomotive according to claim 1, characterized in that: the number of the frequency converters (3) is three.

3. The direct current medium voltage trolley alternating current variable frequency traction electric locomotive according to claim 1, characterized in that: the number of the motors (5) is six.

4. The direct current medium voltage trolley alternating current variable frequency traction electric locomotive according to claim 1, characterized in that: the frequency converters (3) are respectively connected with the two motors (5).

5. The direct current medium voltage trolley alternating current variable frequency traction electric locomotive according to claim 1, characterized in that: the motors (5) are asynchronous alternating current motors (5), and the motors (5) are connected with a locomotive walking shaft through a speed reducer.

6. The direct current medium voltage trolley alternating current variable frequency traction electric locomotive according to claim 1, characterized in that: and leading-in wires at the front ends of the frequency converters (3) are controlled by adopting silicon controlled rectifiers.

7. The direct current medium voltage trolley alternating current variable frequency traction electric locomotive according to claim 1, characterized in that: and the frequency converters (3) are subjected to heat dissipation in a heat pipe forced air cooling heat dissipation mode.