Railway self-power-generation refrigerator car electrical system

Abstract

The invention provides a railway self-power-generation refrigerator car electrical system, which comprises a power generation converter box, a first power box and a second power box, and is characterized in that the power generation converter box is provided with a plurality of groups of power generation rectifiers and permanent magnet generators and has an operation mode and a workshop mode; the operation mode is used for controlling the permanent magnet generator to generate electricity in the running process of the refrigerator car, and the workshop mode is used for supplying power to the refrigerator car when the refrigerator car is stopped for a long time or a power battery is lack of electricity; the power generation converter box is used for controlling the power generation power and the power generation voltage and is responsible for energy management. The first power supply box and the second power supply box are connected with the power generation converter box through the through contactors respectively and comprise a charging mode and a discharging mode, the charging mode is used for storing electric energy in the power generation converter box in the power battery, and the discharging mode is used for converting direct current into alternating current to supply power to the refrigeration system. According to the invention, electric power can be continuously provided for the refrigerator car during parking, the flexible marshalling capability is improved, and carbon emission is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electrical systems, and in particular to an electrical system for a railway self-generating refrigerated vehicle. Background Art

[0002] In the 1990s, my country developed refrigerated trucks with cold storage plates. The ground charging device was used to power the 380V, 20kW refrigeration unit on the vehicle. The refrigeration unit stored cold and cooled it over a long period of time to meet the long-distance transportation needs of the refrigerated trucks. At present, this mode of operation cannot meet the needs of flexible temperature adjustment. Ultra-long-distance transportation is also limited by problems such as cold storage in the middle. The long cold storage time also increases the transportation time.

[0003] At present, the railway cold chain mainly includes single-section mechanical refrigerated vehicles, refrigerated container transport vehicles, refrigerated containers, etc. my country's railway mechanical refrigerated vehicles all adopt the mode of manned escort, and the vehicle manufacturing, operation and maintenance costs are high; most refrigerated vehicles use generator power generation mode, and most of them are operated at fixed points and fixed lines due to small fuel tank capacity, difficulty in refueling on the way, and imperfect auxiliary facilities such as lifting and storage at the station, which affects the transshipment, etc., and the advantages of refrigerated containers in realizing multimodal transport are not brought into play.

[0004] After analysis, the main problem of the current railway refrigerated cars is that the existing scheme still uses the generator power generation mode. Although most railway locomotives use electric traction, due to the flexibility of marshaling, the locomotives are temporarily unable to power the refrigerated cars. Therefore, it is necessary to provide a railway freight car refrigerated car related electrical system with self-generating function. Summary of the invention

[0005] In response to the technical problems raised above, an electrical system for a railway self-generating refrigerated truck is provided. The present invention mainly obtains power from the wheelset during the operation of the train, generates electricity through a permanent magnet generator, provides electricity for the refrigerated truck, and stores excess electricity through a lithium battery system to ensure that the refrigerated truck can continue to be powered when the truck stops, thereby improving the flexible marshaling capacity of the refrigerated truck and reducing carbon emissions.

[0006] The technical means adopted by the present invention are as follows:

[0007] An electrical system for a railway self-generating refrigerated car comprises: a power generation converter box, a first power supply box and a second power supply box, wherein:

[0008] The generator inverter box is provided with a plurality of groups of generator rectifiers working in conjunction with the permanent magnet generator. The generator inverter box has two modes: operation and workshop. The operation mode is used to control the permanent magnet generator to generate electricity during the driving of the refrigerated truck, and the workshop mode is used to power the refrigerated truck when it is parked for a long time or the power battery is low on power. The generator inverter box is used to control the generated power and generated voltage and is responsible for energy management.

[0009] The first power box and the second power box are respectively connected to the generator transformer box, including two modes: charging and discharging. The charging mode is used to store the electric energy in the generator transformer box in the first power battery and the second power battery, and the discharging mode is used to convert direct current into alternating current to power the refrigeration system.

[0010] Furthermore, the power generation converter box includes: a power generation rectifier, a multi-way selection switch, an isolation contactor, a permanent magnet generator and a through contactor, wherein:

[0011] One end of the power generation rectifier is connected to the through contactor, and the other end is connected to the multi-way selection switch, which is used to convert AC power into DC power;

[0012] One end of the multi-way selection switch is connected to the power generation rectifier, and the other end is connected to the isolation contactor, which is used to switch the operation mode and the workshop mode of the power generation transformer box, and switch to the charging circuit during the startup phase of the power generation transformer box;

[0013] One end of the isolation contactor is connected to a multi-way selector switch, and the other end is connected to a permanent magnet generator, so as to protect the circuit and stabilize the voltage;

[0014] The permanent magnet generator is connected to the wheel set through a coupling and a gear box. When the train is running, the permanent magnet generator is driven to rotate by the rotation of the wheel set to generate electrical energy.

[0015] The through contactor is used for redundant expansion of DC busbars between trains.

[0016] Furthermore, an AC power socket is also provided in the power generation and conversion box, and the AC power socket is used to power the refrigeration system and charge the power battery through an AC power supply when the refrigerated truck is parked for a long time or the power battery is low on power.

[0017] Furthermore, the first power supply box includes: a battery charger, a first auxiliary inverter, a first power battery DC / DC and a first contactor, wherein:

[0018] The battery charger obtains electric energy from the busbar in the charging mode to charge the battery and power the control system. The battery connection socket is used to charge the battery charger with an external power supply when the battery charger is low on power.

[0019] The first auxiliary inverter is used to obtain direct current from the busbar and convert the direct current into alternating current to supply power to the refrigerated truck, the first auxiliary inverter is connected to a first contactor, and the first contactor is used to control the output of the first auxiliary inverter;

[0020] The first power battery DC / DC is used to obtain electric energy from the bus for charging in a charging mode, and to convert the electric energy into direct current to supply energy to the bus in a discharging mode. The first power battery DC / DC is connected to a power battery box.

[0021] Furthermore, the second power supply box includes: a second auxiliary inverter, a second power battery DC / DC and a second contactor, wherein:

[0022] The second auxiliary inverter is used to convert direct current into alternating current to supply power to a load, the second auxiliary inverter is connected to a second contactor, and the second contactor is used to control the output of the second auxiliary inverter;

[0023] The second power battery DC / DC is used to realize the charging and discharging function between the busbar, and the second power battery DC / DC is connected to the power battery box.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The railway self-generating refrigerated truck electrical system provided by the present invention obtains power from the wheel set during the operation of the train through the generator box, the first power box and the second power box, generates electricity through the permanent magnet generator to provide electric energy for the refrigerated truck, and stores excess electric energy through the lithium battery system to ensure that the refrigerated truck can continue to be powered when the truck is parked, thereby improving the flexible grouping capacity of the refrigerated truck and reducing carbon emissions.

[0026] Based on the above reasons, the present invention can be widely promoted in the fields of electrical systems and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 The invention discloses an electrical system for a railway self-generating refrigerated car.

[0029] In the figure: 1. Generator rectifier; 2. Multi-way selector switch; 3. Isolation contactor; 4. Permanent magnet generator; 5. AC power socket; 6. Through contactor; 7. Battery charger; 8. First auxiliary inverter; 9. First power battery DC / DC; 10. Second auxiliary inverter; 11. Second power battery DC / DC; 12. First contactor; 13. Second contactor. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] like Figure 1 As shown, the present invention provides an electrical system for a railway self-generating refrigerated car, which is fixedly organized into three trailers and one power generator car (T1+T2+T3+M1), and includes: a power generation converter box, a first power supply box and a second power supply box, wherein:

[0038] The generator inverter box is provided with a plurality of groups of generator rectifiers 1 working in conjunction with the permanent magnet generator 4. The generator inverter box has two modes: operation and workshop. The operation mode is used to control the permanent magnet generator to generate electricity during the driving of the refrigerated truck, and the workshop mode is used to power the refrigerated truck when it is parked for a long time or the power battery is low on power. The generator inverter box is used to control the generated power and generated voltage and is responsible for energy management.

[0039] The first power supply box and the second power supply box are respectively connected to the generator transformer box, including two modes of charging and discharging. The charging mode is used to store the electric energy in the generator transformer box in the first power battery DC / DC9 and the second power battery DC / DC11, and the discharging mode is used to convert direct current into alternating current to power the refrigeration system. The generator transformer box can be connected to other grouped generator transformer boxes through the through contactor 6 to expand the DC bus.

[0040] In specific implementation, as a preferred embodiment of the present invention, the power generation converter box includes: a power generation rectifier 1, a multi-way selection switch 2, an isolation contactor 3, a permanent magnet generator 4 and a through contactor 6, wherein:

[0041] One end of the power generation rectifier 1 is connected to the through contactor 6, and the other end is connected to the multi-way selection switch 2, which is used to convert AC power into DC power;

[0042] One end of the multi-way selector switch 2 is connected to the power generation rectifier 1, and the other end is connected to the isolation contactor 3, which is used to switch the operation mode and the workshop mode of the power generation converter box. The operation mode is used to control the permanent magnet generator to generate electricity during the driving process of the refrigerated truck, and the workshop mode is used to power the refrigerated truck when it is parked for a long time or the power battery is low on power;

[0043] One end of the isolation contactor 3 is connected to the multi-way selection switch 2, and the other end is connected to the permanent magnet generator 4, which is used to isolate the power converter box and the permanent magnet generator to prevent the power unit from being damaged due to the back electromotive force generated by the motor failure.

[0044] The permanent magnet generator 4 is connected to the wheel set through a coupling and a gear box. When the train is running, the permanent magnet generator 4 is driven to rotate by the rotation of the wheel set to generate electrical energy;

[0045] The through contactor 6 is used to connect another group of power generation converter boxes with the same configuration to achieve redundant expansion of the DC 600V power supply between DC buses.

[0046] In specific implementation, as a preferred embodiment of the present invention, an AC power plug 5 is also provided in the power generation converter box, and the AC power plug 5 is used to connect an external AC power supply to charge the power battery and power the refrigeration system when the power battery is low or the refrigerated truck is parked for a long time.

[0047] In specific implementation, as a preferred embodiment of the present invention, the first power supply box includes: a battery charger 7, a first auxiliary inverter 8, a first power battery DC / DC 9 and a first contactor 12, wherein:

[0048] The battery charger 7 obtains electric energy from the busbar in the charging mode to charge the battery and to supply power to the control system. The battery charger 7 is connected to a socket to charge the battery with an external power supply when the battery is low on power.

[0049] The first auxiliary inverter 8 is used to obtain direct current from the bus and convert the direct current into alternating current to supply power to the refrigerated truck. The first auxiliary inverter 8 is connected to a first contactor 12, and the first contactor 12 is used to control the output of the first auxiliary inverter 8;

[0050] The first power battery DC / DC9 is used to obtain electric energy from the bus for charging in a charging mode, and to convert the electric energy into direct current to supply energy to the bus in a discharging mode. The first power battery DC / DC9 is connected to a power battery box.

[0051] The power battery box is equipped with a high-power lithium-ion power battery. When the power generation exceeds the power consumption during the normal operation of the refrigerated truck, each vehicle stores the energy in the power battery box through the power battery DC / DC. When the speed of the refrigerated truck is too low, resulting in insufficient power generation or the vehicle is in a parking state, the power of the power battery box is released to the DC600V DC bus through the power battery DC / DC for use by the auxiliary inverter.

[0052] In specific implementation, as a preferred embodiment of the present invention, the second power supply box includes: a second auxiliary inverter 10, a second power battery DC / DC 11 and a second contactor 13, wherein:

[0053] The second auxiliary inverter 10 is used to convert direct current into alternating current to supply power to a load, and the second auxiliary inverter 10 is connected to a second contactor 13, and the second contactor 13 is used to control the output of the second auxiliary inverter 10;

[0054] The second power battery DC / DC11 is used to realize the charging and discharging function between the busbar, and the second power battery DC / DC11 is connected to the power battery box.

[0055] In terms of vehicle reconnection, this -T1+T2+T3+M1- formation can be reconnected with another identical formation for operation. The DC600V busbar is connected, which can further increase the redundancy of systems such as the power generation transformer box and the power battery box, making the system more reliable.

[0056] Example 1

[0057] like Figure 1As shown, the present invention provides an electrical system for a railway self-generating refrigerated car, which generates electricity by driving a permanent magnet generator through the operation of a locomotive to pull a train, and the electric energy is converted into a rated DC600V through a generator converter box, and the DC600V electric energy is converted into AC380V electric energy through a generator rectifier 1. The generator converter box is provided with two through contactors 6, which are responsible for breaking the DC600V busbar; the generator converter box is provided with an external 380V AC power socket 5 for emergency power supply; the generator converter box is connected to the permanent magnet generator and the DC600V busbar; the first power battery DC / DC9 in the first power box is responsible for the charging and discharging function between the power battery box and the DC600V busbar; the first auxiliary inverter 8 is responsible for converting DC600V into AC380V to power the AC380V load (refrigeration system); the battery charger 7 provides DC110V electric energy for the control system and the battery. The second power battery DC / DC11 in the second power box is responsible for the charging and discharging functions between the power battery box and the DC600V bus; the second auxiliary inverter 10 is responsible for converting DC600V into AC380V to supply power to the AC380V load (refrigeration system).

[0058] A multi-way selection switch is set in the generator inverter box, which can select the "run" position when the train is running, and select the "workshop" position when the battery is low or in special circumstances. The station or other external AC380V can be used to provide emergency power to the refrigerated truck or replenish power for the power battery, further increasing the adaptability of the system.

[0059] The DC side of the power generation transformer box has a rated output of DC600V (fluctuation range: DC560V~620V), and is internally equipped with a rectifier circuit, a BUCK step-down circuit, a BOST step-up circuit, a DC600V high-voltage positive and negative contactor, etc. An isolation contactor is set between the rectifier circuit and the permanent magnet generator.

[0060] An AC380V workshop power supply socket is set inside the generator converter box. When the lithium iron phosphate battery is low on power and the vehicle is not running, the AC380V workshop power supply socket can be used to provide power to the vehicle. A matching AC380V power supply and plug must be available externally.

[0061] The generator converter box, the first power supply box, the second power supply box, the power battery box, etc. are implemented using the MVB bus or the CAN bus. The generator converter box serves as the energy manager of the grouping and is responsible for power generation management and power battery energy management.

[0062] When the speed of a refrigerated truck is between 5km / h and 40km / h, the power generation capacity gradually increases from 0 to 20kW. When the speed is between 40km / h and 120km / h, the power generation capacity is stabilized at a maximum of 20kW. The power generation capacity is related to the system load and the energy storage status of the power battery, and the power generation inverter is responsible for the energy management of the entire system.

[0063] A fixed set (T1+T2+T3+M1) can be reconnected with another identical set or more fixed sets to enhance the redundancy of the self-generating system.

[0064] Example 2

[0065] like Figure 1 The figure shows the main circuit diagram of the electrical system of a fixed formation "-T1+T2+T3+M1-". The generator converter box is connected to the permanent magnet generator and the DC600V busbar; the DC600V busbar is connected to the first power box in the M1 car, and to the second power box in the T1, T2 and T3 cars; the first power box is connected to the power battery box, the AC380V load and the DC110V load; the second power box is connected to the power battery box and the AC380V load.

[0066] The total power of the generator converter is not less than 80kW, and the rated power of the permanent magnet generator is 20kW. It starts to generate electricity when the vehicle speed exceeds 5km / h. When the vehicle speed is between 40km / h and 120km / h, the power generation can reach the rated upper limit of 20kW. At 5km / h to 40km / h, the output voltage of the permanent magnet generator is AC160~480V, and the power generation gradually increases to 20kW as the speed increases. The rated output voltage of the DC side of the generator converter is DC600V, and the voltage fluctuation range is DC560V~620V. The generator converter automatically adjusts the DC voltage target value according to the voltage of the power battery box and the vehicle speed.

[0067] Each power battery box has an energy storage capacity of 62kWh, a rated voltage of 384V, a voltage fluctuation range of 300V to 438V, and a rated charge and discharge current of 67A.

[0068] The charging and discharging power of the power battery DC / DC in the first power box and the second power box is 20kW; the rated capacity of the auxiliary inverter DC / AC is 20kVA. The rated power of the battery DC / DC in the first power box is 15kW.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrical system for a railway self-generating refrigerated car, characterized in that: include: A power generation converter box, a first power supply box and a second power supply box, wherein: The power generation inverter box is provided with a plurality of power generation rectifiers (1) and works in conjunction with the permanent magnet generator (4). The power generation inverter box has two modes: operation mode and workshop mode. The operation mode is used to control the permanent magnet generator to generate electricity during the driving of the refrigerated truck, and the workshop mode is used to supply power to the refrigerated truck when the truck is parked for a long time or when the power battery is low on power. The power generation inverter box is used to control the power generation power and the power generation voltage and is responsible for energy management. The first power supply box and the second power supply box are respectively connected to the power generation and conversion box, including two modes: charging and discharging. The charging mode is used to store the electric energy in the power generation and conversion box in the first power battery DC / DC (9) and the second power battery DC / DC (11), and the discharging mode is used to convert direct current into alternating current to power the refrigeration system.

2. The electrical system of the railway self-generating refrigerated car according to claim 1, characterized in that: The power generation converter box comprises: a power generation rectifier (1), a multi-way selection switch (2), an isolation contactor (3), a permanent magnet generator (4) and a through contactor (6), wherein: One end of the power generation rectifier (1) is connected to a through contactor (6), and the other end is connected to a multi-way selector switch (2), and is used to convert alternating current into direct current; One end of the multi-way selection switch (2) is connected to the power generation rectifier (1), and the other end is connected to the isolation contactor (3), and is used to switch the power generation transformer box between the operation mode and the workshop mode, and is switched to the charging circuit during the startup phase of the power generation transformer box; One end of the isolation contactor (3) is connected to the multi-way selection switch (2), and the other end is connected to the permanent magnet generator (4), so as to protect the circuit and stabilize the voltage; The permanent magnet generator (4) is connected to the wheel set through a coupling and a gear box, and when the train is running, the permanent magnet generator (4) is driven to rotate by the rotation of the wheel set to generate electric energy; The through contactor (6) is used for redundant expansion of DC busbars between trains.

3. The electrical system of the railway self-generating refrigerated car according to claim 2, characterized in that: The power generation converter box is also provided with an AC power socket (5), and the AC power socket (5) is used to supply power to the refrigeration system and charge the power battery through an external AC power supply when the refrigerated truck is parked for a long time or the power battery is low on power.

4. The railway self-generating refrigerated car electrical system according to claim 1, characterized in that: The first power supply box comprises: a battery charger (7), a first auxiliary inverter (8), a first power battery DC / DC (9) and a first contactor (12), wherein: The battery charger (7) obtains electric energy from the busbar in the charging mode to supply power to the battery and the control system. The battery charger (7) is connected to a socket so that when the battery charger (7) runs out of power, an external power source can charge the battery charger; The first auxiliary inverter (8) is used to obtain direct current from the busbar and convert the direct current into alternating current to supply power to the refrigerated truck, the first auxiliary inverter (8) is connected to a first contactor (12), and the first contactor (12) is used to control the output of the first auxiliary inverter (8); The first power battery DC / DC (9) is used to obtain electric energy from the bus for charging in a charging mode, and to convert the electric energy into direct current to supply energy to the bus in a discharging mode. The first power battery DC / DC (9) is connected to a power battery box.

5. The electrical system of the railway self-generating refrigerated car according to claim 1, characterized in that: The second power supply box comprises: a second auxiliary inverter (10), a second power battery DC / DC (11) and a second contactor (13), wherein: The second auxiliary inverter (10) is used to convert direct current into alternating current to supply power to a load, the second auxiliary inverter (10) is connected to a second contactor (13), and the second contactor (13) is used to control the output of the second auxiliary inverter (10); The second power battery DC / DC (11) is used to realize the charging and discharging function between the busbar, and the second power battery DC / DC (11) is connected to the power battery box.

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