Buried energy storage bidirectional converter control device for railway environment

Abstract

This invention discloses a buried energy storage bidirectional converter control device for railway environments, relating to the field of energy storage technology. It includes a housing, within which a partition assembly, a monitoring mechanism, a safety module, and a safety controller are disposed. The partition assembly includes a first partition parallel to the housing opening and a second partition cooperating with the first partition. The side of the first partition facing the housing opening is called the busbar area, and the back side is called the common area. Multiple second partitions, in conjunction with the housing wall panels, at least divide the common area into an inverter chamber, a switching chamber, and a safety chamber. At least one inverter board is installed in the inverter chamber, at least one switching board is installed in the switching chamber, and at least the safety controller is installed in the safety chamber. This application improves the safety of buried energy storage designs after being put into use in railway environments and is more compatible with traffic safety guidelines.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a buried bidirectional converter control device for railway environments. Background Technology

[0002] Traction power supply refers to the power supply method for the electrical energy required to drive vehicles. It is the core power supply system of electrified railways. Through the traction substation, high-voltage electricity is converted into single-phase electricity to supply the contact network, and then power is supplied to the contact networks in both the up and down directions of the railway to match the electrical energy of electric locomotives.

[0003] Currently, for reasons such as stabilizing the voltage of the traction power grid and recovering energy during the stopping process, the traction power supply system will be equipped with an energy storage system. Train energy storage is generally divided into: on-board energy storage and ground energy storage. Among them, ground energy storage does not need to consider the train load and space occupation, the installed capacity is relatively larger, and it is deployed along the track to provide power to the train nearby.

[0004] Energy storage systems along railway lines are typically installed above ground. However, due to limitations in current battery technology, they pose risks of overheating, runaway combustion, and explosion, presenting significant safety hazards. To address this, a new underground energy storage solution has emerged, burying the energy storage unit underground to isolate it from the air and surface. This technology allows for greater development potential in railway energy storage, expanding beyond simply storing energy recovered from braking and for self-use of grid energy during off-peak hours. It enables more diversified applications, such as peak shaving and valley filling, and self-generation of photovoltaic power to recover costs and even generate profits. However, this also introduces new challenges.

[0005] Energy storage systems used in railway environments for power transmission, like those in other industries, require bidirectional energy storage converters (PCs). These PCs are used to convert AC power from the grid into DC power during off-peak hours to charge the energy storage compartments; and to transmit surplus energy externally. However: The railway environment differs from general residential energy storage and new energy storage. Its primary standard is ultimately ensuring the safety of train operations along the line. Traditional bidirectional converters (inverter architectures) often use a shared inverter module architecture. Taking the grid-connected current flow as an example: Photovoltaic modules → enclosure: MPPT (DC-DC) → common DC bus; Lithium battery pack → enclosure: PCS DC side → common DC bus; Then, the common DC bus → PCS inverter bridge (inverter board) → monitoring and protection board → switching board → grid connection point (power grid / railway traction network). As can be seen from the examples and known cabinet disassembly and assembly results, under the existing architectural concept, the various functional boards are relatively concentrated in the cabinet. However, the bidirectional converter cabinet in the aforementioned railway environment has more external power transmission tasks than before, which increases the probability of failure. Moreover, a single point fault (overvoltage / current / heat) can easily cause a chain of faults inside, leading to the direct shutdown of the cabinet and downstream equipment. This conflicts with the railway environment's core standard of train operation safety. Therefore, this application proposes a new technical solution. Summary of the Invention

[0006] To improve the safety of underground energy storage designs after being put into use in railway environments and to better adapt to traffic safety guidelines, this application provides a bidirectional converter control device for underground energy storage in railway environments.

[0007] This application provides a buried energy storage bidirectional converter control device for railway environments, employing the following technical solution: A buried energy storage bidirectional converter control device for railway environments includes a housing, wherein at least one side of the housing has an opening and is covered by a suitable cover, and the housing contains a partition assembly, a monitoring mechanism, a safety module and a safety controller. The partition assembly includes a partition 1 parallel to the housing opening and a partition 2 that works with the partition 1 to enclose different functional areas. The partition 1 is located at the upper or lower part of the housing and is connected to the housing at both ends laterally. The side of the partition 1 facing the housing opening is called the busbar area, and the back side is called the common area. There are multiple partitions 2, and the multiple partitions 2, together with the casing wall panel, at least divide the common area into an inverter chamber, a switching chamber and a safety chamber. At least the inverter board is installed in the inverter chamber, at least the switching board is installed in the switching chamber, and at least the safety controller is installed in the safety chamber. The monitoring mechanism includes multiple smoke sensors and / or temperature sensors installed in each chamber, and the monitoring mechanism is electrically connected to the safety controller. The safety module includes a fire extinguishing module and a two-stage switching module. The fire extinguishing module is equipped with multiple fire extinguishing pipes that are connected to each chamber and area respectively, and the fire extinguishing pipes are equipped with solenoid valves that are electrically connected to the safety controller. One end of the secondary switching module is electrically connected to the DC bus in the chassis, and the other end is electrically connected to the input side of the inverter board in at least one adjacent chassis. The secondary switching module is electrically connected to the safety controller, which is used to electrically connect to the control system of the bidirectional converter and to control the on / off switching circuit of the secondary switching module.

[0008] Optionally, the inverter chamber and the switching chamber are arranged adjacent to each other along the length of the partition. The safety chamber is divided into two sections, one of which is located above or below the inverter chamber and the switching chamber to accommodate the fire extinguishing module, and the other section extends to the arrangement direction of the inverter chamber and the switching chamber to accommodate the safety controller. A diversion pipe is fixed on the partition along its length, and multiple pipe joints are installed on the diversion pipe. The pipe joints are connected to the fire extinguishing module and the fire extinguishing pipeline.

[0009] Optionally, the connection point of the secondary switching module and the DC bus is located outside the inverter chamber and the switching chamber, and near the section where the secondary switching module is installed in the fuse chamber; a tertiary switching module is installed in the bus area, the tertiary switching module is connected in series with the DC bus and is located between the connection point of the inverter board and the DC bus, and the connection point of the secondary switching module and the DC bus, and the tertiary switching module is electrically connected to the safety controller.

[0010] Optionally, the secondary switching module includes at least two relay units and corresponding external connecting wires. The external connecting wires are electrically connected to DC buses in different housings. The normally open contacts of the relay units are connected in series with the external connecting wires, and the control terminals are electrically connected to the safety controller.

[0011] Optionally, the three-level switching module includes another set of relay units, and the normally closed contacts of the relay units are connected in series with the DC bus, or the normally open contacts are connected in series with the DC bus and the safety controller controls the normally open contacts to close at least before controlling the second-level switching module to turn on.

[0012] Optionally, the housing has an emergency port connecting the safety chamber to the outside, and the emergency port is located in a section of the safety chamber in the direction in which the inverter chamber and the switching chamber are arranged; A movable frame and a drive unit are provided in the protective chamber. The movable frame is directly opposite the emergency port and is slidably connected to the inner wall of the housing. A sealing unit plate is fixed on one side of the movable frame. The sealing unit plate is located outside the emergency port and has an area larger than the emergency port. The drive unit is electrically connected to the safety controller and is used to drive the movable frame to extend out of the emergency port; at least the safety controller is mounted on the movable frame.

[0013] Optionally, the housing is also provided with an internal heat dissipation device, which includes a partition three, a circulation pump and a circulation pipe. The partition three is located on the side of the partition one facing the opening of the housing and has a liquid flow channel inside. The length of the partition three extends along the width of the partition one. The DC bus is installed between the partition three and the end of the casing; The circulating pump forms a liquid flow circulation through the circulating pipe and the liquid flow channel in the partition three, and the circulating pipe passes through the heat dissipation structure inside or outside the casing.

[0014] Optionally, the drive unit includes an air tank, an air cylinder, an air pressure sensor, and an air valve. The air cylinder is installed in the housing and its telescopic rod is connected to the movable frame. The air tank is connected to an air pipe, and the air pipe is connected to the cylinder body of the air cylinder. The air valve is installed on the air pipe and electrically connected to the safety controller. A section of the circulating pipe through which the cooled coolant flows is arranged around the air tank and / or the air tank is arranged on the front of a partition and located outside the partition. The air pressure sensor is installed on the air tank and its detection end extends into the air tank.

[0015] In summary, this application includes the following beneficial technical effects: 1. By using partitions, the various functional boards under the shared architecture of energy storage charging and discharging are physically separated to block the possible fire spread path when a fault causes a fire. The fire extinguishing mechanism is used to actively manage the risk and confine the damage caused by the circuit fault to the smallest possible area and the earliest possible stage. 2. When the information fed back by the monitoring agency meets the preset shutdown conditions of the machine, the safety controller can send a prompt message to the control system of the bidirectional converter and initiate an emergency dispatch process: under preset conditions and at the specified time, control the secondary switching module to turn on the DC bus of the machine and the other bidirectional converter (PCS); In this way, even if the common electrical part responsible for charging and discharging in the casing fails or is damaged, as long as there is still a usable PCS on site, the different subordinate energy storage compartments can be kept online through a rotating switching method to provide emergency power supply to the site with the original energy storage capacity, thereby greatly improving the safety of energy storage power use in environments such as railways.

[0016] 2) Because the connection objects of the secondary switching module are the DC bus and the inverter board in another chassis, it can be placed on the front of the partition one during installation. That is, the secondary switching module and the inverter board and switching board in the chassis are physically isolated and are relatively less likely to be involved and damaged. Furthermore, the safety controller that controls it is also independently isolated, so the structural integrity of the secondary switching module can be guaranteed under various harsh environments and operating conditions, thus fulfilling its intended function and ensuring the normal implementation of the aforementioned functions. Attached Figure Description

[0017] Figure 1 This is a complete three-dimensional schematic diagram of this application; Figure 2 This is a schematic diagram of the control architecture of this application; Figure 3 yes Figure 1 A schematic diagram of the structure after partial structure is hidden; Figure 4 This is a schematic diagram of the rear structure of the partition assembly area; Figure 5This is a schematic diagram of the circuit structure of the DC bus and the secondary switching module.

[0018] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Track plate; 2. Baffle assembly; 21. Baffle one; 22. Baffle two; 3. Monitoring mechanism; 31. Smoke sensor; 32. Temperature sensor; 4. Safety module; 41. Fire extinguishing module; 411. Diverter pipe; 412. Fire extinguishing pipeline; 413. Solenoid valve; 42. Secondary switching module; 43. Tertiary switching module; 5. Safety controller; 6. Movable frame; 61. Sealing unit plate; 7. Drive unit; 71. Gas tank; 72. Cylinder; 73. Air pressure sensor; 74. Air valve; 81. Baffle three; 82. Circulation pump. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1 - Figure 5 This application will be described in further detail.

[0020] This application discloses an underground energy storage bidirectional converter control device for railway environments.

[0021] Reference Figure 1 , Figure 2 and Figure 3 The underground energy storage bidirectional converter control device for railway environments includes a housing 1, a partition assembly 2, a monitoring mechanism 3, a safety module 4, and a safety controller 5, wherein: Firstly, by using the partition assembly 2, the various functional boards under the shared architecture of energy storage charging and discharging are physically separated, blocking the possible fire spread path when a fault causes a fire, and using the heat dissipation mechanism to suppress the risk, and using the fire extinguishing mechanism to actively manage the risk, thus confining the damage caused by the circuit fault to the smallest possible area and the earliest possible stage. Secondly, an extreme risk avoidance mechanism is introduced to proactively cut off the original charging and discharging path in the cabinet under adverse conditions, and to use other cabinets on site for temporary emergency dispatch to continue to maintain the connection between the energy storage system and the energy storage compartments and photovoltaic facilities under the original cabinet, so as to maintain the original energy storage emergency power supply capacity as much as possible and maintain the energy storage system's guarantee effect on train operation safety in the railway environment.

[0022] The following is a detailed explanation: Reference Figure 1 The casing 1 has a hollow cuboid structure and is set up upright. Its front is open and the cover is installed by bolts, rather than by hinged joints. This is because the integrated unit of bidirectional converter (inverter) often contains integrated circuit boards that are not individually packaged and have a large current. It is not recommended to open the cover to access them relatively casually.

[0023] Reference Figure 3 and Figure 4The partition assembly 2 includes partition 1 21 and partition 2 22, wherein partition 1 21 is parallel to the opening of the housing 1 and is located at the upper or lower part of the housing 1. The reason for the above-mentioned location is as follows: the side of partition 21 facing the opening of the housing 1 is called the busbar area, and the back side is called the common area. The common area is separated into at least the inverter chamber, the switching chamber, and the fuse chamber by partition 22. That is to say, partition 21 is located between the front and rear walls of the housing 1. If partition 21 is not in the upper or lower part of the housing 1, it will occupy the central core area of ​​the housing 1, which will greatly reduce the space that can actually be installed on the front of the housing 1 for electrical components. The known inverter equipment contains many medium and large capacitors and bundles of wiring that are difficult to flatten, which require a large thickness space in the housing 1. In other words, an improper position of partition 21 will conflict with the layout of the integrated circuit structure in the housing, resulting in a larger thickness of the housing 1 and making the equipment more cumbersome. Therefore, it is set in a specific position. At the same time, this is also the basis for the fire extinguishing and other designs applied for, which will be explained later.

[0024] The following explanation uses the example of partition 21 being installed on the upper part of housing 1: Reference Figure 3 and Figure 4 A track plate 11 is symmetrically arranged inside the housing 1. The lower end of the track plate 11 is fixed to the inner bottom of the housing 1, and the upper end is close to the bottom of the partition 21. A partition 22 is laid flat and is penetrated or abutted by the track plate 11. The length of the partition 22 extends horizontally and is fixed to the back of the partition 21, close to the bottom edge of the partition 21. L-shaped accessories are fixed to the left and right sides of the bottom of the partition 22. The L-shaped accessories are laid horizontally, with one end facing the opening of the housing 1 and the other end facing the side wall of the adjacent housing 1. The inner corner of the L-shaped accessory is fastened to the back of the track plate 11. The track plate 11 has positioning holes evenly opened along its length. The L-shaped accessory has corresponding holes and is fixed to the bottom of the previous partition 22. Thus, the partition 22 and the partition 21 can be fixed to the track plate 11 with bolts, and their height relative to the housing 1 can be adjusted appropriately according to the installation requirements.

[0025] Understandably, the upper part of the track slab 11 that is too long can be cut off during installation to prevent it from affecting the installation of other structures.

[0026] Reference Figure 4 In this embodiment, the other partition 22 is fixed to the back of the partition 21 to divide the common area on the back of the partition 21 into at least an inverter chamber, a switching chamber, and a safety chamber. This application takes these three chambers as an example: There are three partitions 22, two of which are placed vertically and arranged side by side; one partition 22 is fixed to the bottom of the two partitions 22 and one end is fixed to the side wall of the housing 1, and the other end extends horizontally, aligning with the partition 22 away from the front end; that is, the three partitions 22, together with partition 1 21, enclose two side by side chambers, one of which is L-shaped in front view.

[0027] The two side-by-side chambers, from left to right, are the inverter chamber and the switching chamber, respectively, while the L-shaped chamber is the safety chamber. The reason for this arrangement is: First, the front of partition 21 is the busbar area, which is mainly used to install DC buses. Its horizontal dimension is its length. After the DC buses are installed, they can be connected to the circuit structure in the inverter chamber on the back side by cables, eliminating the need for winding around and saving intermediate wiring.

[0028] Secondly, the inverter chamber is used to install the inverter board, the switching chamber is used to install the switching board, and the fuse chamber is used to install the fuse module 4 and the safety controller 5. The fuse module 4 includes the fire extinguishing module 41, which in turn includes an automatic fire extinguisher. The fire extinguisher must have a tank, and the transverse section of the L-shaped chamber is just right to hold a longer and larger capacity fire extinguisher to ensure fire extinguishing capability. At the same time, the fire extinguishing module 41 needs to be equipped with a diversion pipe 411 that connects to the output port of the automatic fire extinguisher. The diversion pipe 411 can be placed in front of or behind the partition 21 and extends along the length direction. After installing multiple pipe joints to connect to the fire extinguishing pipes 412, it can be used to extinguish fires in the chambers and areas along the line. The fire extinguishing flow path is relatively smooth and short, which can allow the fire extinguishing medium to reach the required location more quickly.

[0029] It is understandable that a solenoid valve 413 should be installed on the fire extinguishing pipe 412, and the solenoid valve 413 is electrically connected to the safety controller 5 so as to extinguish the fire in a targeted manner when needed.

[0030] Reference Figure 3 The safety controller 5 is installed in the vertical section of the L-shaped safety chamber, rather than in another independent chamber. This is because the fire extinguishing module 41 is unlikely to experience a fire on its own under normal circumstances, so it can share a chamber with it, thus avoiding the need for additional isolation design.

[0031] Reference Figure 2 The safety controller 5 includes a microcontroller controller and is electrically connected to the monitoring mechanism 3 to determine when to extinguish the fire. The monitoring mechanism 3 includes a smoke sensor 31 and / or a temperature sensor 32. In this embodiment, both are used as an example. One set is installed in the inverter chamber, the switching chamber, and the safety chamber respectively. Provided that the fire extinguishing module 41 is also provided with at least one fire extinguishing pipe 412 leading to the inner cavity of the casing 1 outside the partition 21, a set of smoke sensors 31 and temperature sensors 32 are also installed in the middle of the inner cavity of the casing 1.

[0032] When in use, if the detection information fed back by a certain group of sensors meets the preset fire extinguishing activation conditions, the safety controller 5 controls the solenoid valve 413 on the corresponding fire extinguishing pipeline 412 to open and release the fire extinguishing medium of the automatic fire extinguisher to control the fire.

[0033] In this embodiment, such as the inverter chamber, it is theoretically isolated and sealed after electrical installation. On the one hand, it can prevent the spread of fire, and on the other hand, it can create an oxygen-deficient closed environment to passively suppress the fire. However, because the internal functional board needs to be connected to other circuits, holes will be opened in the walls of the chamber. Therefore, it is also necessary to fill the wire holes of each chamber with fireproof sealant to seal them in order to ensure that they play their due role.

[0034] Furthermore, in this application, the improvement of the safety of bidirectional converters is not limited to the above, but more importantly, it enables temporary emergency dispatching based on this: Reference Figure 2 and Figure 5 The insurance module 4 also includes a secondary switching module 42, one end of which is electrically connected to the DC bus in the housing 1, and the other end is electrically connected to the input side of the inverter board in at least one adjacent housing 1. The secondary switching module 42 is electrically connected to the safety controller 5. The safety controller 5 is used to electrically connect to the control system of the bidirectional converter (e.g., the upper-level EMS system) and to control the on / off switching circuit of the secondary switching module 42.

[0035] Based on the above settings: 1) When the information fed back by the monitoring agency 3 meets the preset shutdown conditions, the safety controller 5 can send a prompt message to the control system of the bidirectional converter and initiate an emergency dispatch process: under preset conditions and at the same time, control the secondary switching module 42 to turn on the DC bus of the machine and another bidirectional converter (PCS). In this way, even if the common electrical part responsible for charging and discharging in the casing 1 fails or is damaged, as long as there is still a usable PCS on site, the different subordinate energy storage compartments can be kept online through a rotating switching method to provide emergency power supply to the site with the original energy storage capacity, thereby greatly improving the safety of energy storage power use in environments such as railways.

[0036] 2) Because the connection objects of the secondary switching module 42 are the DC bus and the inverter board in the other housing 1, it can be placed on the front of the partition 21 during installation. That is, the secondary switching module 42 and the inverter board, switching board, etc. in the housing 1 are physically isolated and are relatively less likely to be involved and damaged. Furthermore, since the safety controller 5 that controls it is also independently isolated, the structural integrity of the secondary switching module 42 is ensured under various harsh environments and operating conditions, thus fulfilling its intended function and ensuring the normal implementation of the aforementioned functions.

[0037] Reference Figure 3 and Figure 4 In another embodiment of this application, the connection point of the secondary switching module 42 and the DC bus is located outside the inverter chamber and the switching chamber, and near the section where the safety controller 5 is installed in the fuse chamber, i.e., the vertical section of the L-shaped chamber.

[0038] According to the above configuration, under the aforementioned chamber distribution design, the connection points of the secondary switching module 42 and the DC bus, and the connection points of the local inverter board and the DC bus are distributed on both sides of the casing 1, one on the left and one on the right, at the two ends of the horizontally arranged DC bus as far away as possible, thereby further reducing the probability of the secondary switching module 42 being damaged.

[0039] Because the above-mentioned arrangement provides relatively ample space between the two connection points, this application also includes a three-stage switching module 43 installed in the busbar area. The three-stage switching module 43 is connected in series with the DC busbar and located between the two connection points. The three-stage switching module 43 is electrically connected to the safety controller 5.

[0040] According to the above settings, if the PCS installs an access board for connecting the inverter board and collecting current / voltage parameters in the chamber where the switching board is located, the safety controller 5 can determine whether the fault has caused a short circuit or an open circuit based on the real-time voltage and current parameters. When a short circuit occurs, it will first control the third-level switching module 43 to disconnect the connection between the common architecture part of the machine and the DC bus, so as to avoid mistakenly controlling the second-level switching module 42 to conduct the scheduling switching circuit and damaging other normal cabinets.

[0041] Reference Figure 5 In one embodiment of this application, the secondary switching module 42 includes at least two relay units; it is understood that if the energy storage requires grounding, i.e., a neutral line is required in addition to the positive and negative lines, there can be three relay units. Multiple relay units are integrated on the same circuit board and mounted on the front side of the partition 21.

[0042] Understandably, the three-level switching module 43 also includes a relay unit, but the difference is: The relay of the secondary switching module 42 has a normally open contact connected to the DC bus, and the control terminal is connected to the safety controller 5; The relays in the three-level switching module 43 have either normally closed contacts connected to the DC bus or normally open contacts connected to the DC bus, but under normal circumstances, the control is to close the normally open contacts.

[0043] When using a relay unit, at least the normally open contacts should be connected to a designated object via pre-selected external wires that conform to the current voltage and current standards to prevent accidental melting due to normal current. Relays are existing technology, so they will not be described in detail here.

[0044] Reference Figure 3 and Figure 4 In another embodiment of this application, the housing 1 has an emergency opening that connects the vertical section of the L-shaped safety chamber to the outside. That is, the emergency opening is located in a section of the safety chamber in the direction in which the inverter chamber and the switching chamber are arranged.

[0045] A movable frame 6 and a drive unit 7 are provided in the protective chamber. The movable frame 6 faces the emergency port and is slidably connected to the inner wall of the housing 1. A sealing unit plate 61 is fixed on the side of the movable frame 6 away from the housing opening. The sealing unit plate 61 is located outside the emergency port and has an area larger than the emergency port.

[0046] The drive unit 7 is electrically connected to the safety controller and is used to drive the movable frame 6 to extend out of the emergency port. The safety controller 5 is installed on the movable frame 6.

[0047] Because the partition is often made of metal plate for structural strength considerations, if the fire is not controlled in time, the temperature will be quickly transferred to the safety chamber, causing the internal temperature to rise. Known chips are not only prone to low operating efficiency when the temperature is too high, but may even be damaged. Therefore, this application also makes the above-mentioned settings. According to the above settings, if the feedback monitoring agency 3 sends a message to the safety controller 5 indicating that the temperature of the safety chamber is too high, the control drive unit 7 will temporarily push the movable frame 6 to send the safety controller 5 out of the housing 1 for preventive protection, so as to ensure that the aforementioned functions are not affected.

[0048] Reference Figure 2 and Figure 3 In another embodiment of this application, an internal heat dissipation device is also provided in the housing 1, which includes a partition plate 81, a circulation pump 82 and a circulation pipe.

[0049] Among them, partition 3 81 is fixed to the side of partition 1 21 facing the opening of the housing 1 and has a liquid flow channel inside. The length of partition 3 81 extends along the width of partition 1 21, that is, it extends to the left and right of the housing 1. Partition 3 81 is close to the lower edge of the inverter chamber and the switching chamber.

[0050] The DC bus is installed between partition 381 and the adjacent end of the casing 1.

[0051] Based on the above settings: First, the DC bus is separated from other electrical components in the housing 1 (such as MPPT, etc.). This way, even if the cable hole sealing structure of the inverter chamber and other structures that are connected to the DC bus is damaged, it will not be directly connected to other areas of the housing 1. Instead, it will be isolated by the partition 3 81. Secondly, since there is a liquid flow channel inside the partition 3 81, theoretically, once the liquid cooling cycle is activated, it can suppress the temperature rise of the DC bus installation area and the adjacent chambers. Therefore, it can not only reduce the probability of overheating damage to electrical components such as inverter boards, but more importantly, it can also reduce the probability of the safety controller 5 in the previous embodiment occurring.

[0052] The circulating pump 82 can be externally mounted on the housing 1 or internally mounted on the housing 1. It forms a liquid flow circulation through the liquid flow channel in the partition 3 81 via the connected circulation pipe. The circulation pipe passes through the heat dissipation structure inside or outside the housing 1.

[0053] Example: The liquid flow channels in partition 3 81 are multiple, parallel, and unidirectional; the output port of the circulation pump 82 is connected to a section of circulation pipe, and the other end of the circulation pipe is connected to multiple branch pipes, each branch pipe is connected to the right end of each liquid flow channel; the left end of the liquid flow channel is connected to another circulation pipe through another set of branch pipes, and the circulation pipe extends out of the housing 1 and passes through the heat dissipation structure outside the housing 1.

[0054] The reason for retaining the external heat dissipation structure option of chassis 1 is that when there are multiple cabinet units, liquid cooling usually shares the heat dissipation tower and heat dissipation pipes to reduce costs.

[0055] Understandably, it would be a waste to only allow the internal heat dissipation device to dissipate heat in the area where the partition 21 is located. Therefore, the lower part and the left and right sides of the casing 1 can be designed as a double-layer structure, so that the circulation pipe runs around the middle and then extends out of the casing 1.

[0056] Reference Figure 2 and Figure 3 Based on the above configuration, the drive unit 7 includes an air tank 71, an air cylinder 72, an air pressure sensor 73, and an air valve 74.

[0057] A slide rail is fixed on the inner wall of the housing 1 and the opposite partition 22. A slider adapted to the slide rail is fixed at the bottom of the movable frame 6. The slider is slidably connected to the slide rail. The cylinder 72 is installed on the partition 21 and the telescopic rod is connected to the movable frame 6 through the accessory plate.

[0058] The gas tank 71 is connected to a gas pipe and the gas pipe is connected to the cylinder body of the cylinder 72. The gas valve 74 is installed on the gas pipe and electrically connected to the safety controller 5. A section of the circulating pipe for the cooled liquid is arranged around the gas tank 71. And / or, the gas tank 71 is installed on the outside of the partition 3 81, in the open position on the front of the partition 1 21, and is fixed laterally.

[0059] The above configuration makes full use of the space allocated by partition 21, and allows the gas tank 71 to be larger, which is conveniently located next to the liquid-cooled partition 81 for cooling, and also ensures high safety.

[0060] The pressure sensor 73 is installed on the gas tank 71 and the sensing end extends into the gas tank 71. The pressure gauge on the gas tank is set as existing technology and will not be described in detail.

[0061] It should be noted that, in another embodiment, the pressure sensor 73 is electrically connected to the safety controller 5, and the safety controller 5 not only sends a low pressure warning when the pressure is low, but it can also be configured to: When the movable frame 6 needs to be sent out, but the pressure in the air tank 71 is insufficient, the liquid cooling circulation is stopped. This allows the air tank 71 to be temporarily heated by the negative high temperature of the casing 1 to replenish the air pressure, reducing the chance that the components will gradually fail due to maintenance negligence after long-term use. This is one of the reasons why the drive unit 7 uses a cylinder 72.

[0062] In summary, this application improves the safety of underground energy storage design after it is put into use in railway environments, and is more compatible with traffic safety guidelines.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A buried energy storage bidirectional converter control device for railway environments, comprising a housing (1), wherein the housing (1) has an opening on at least one side and is covered by a suitable cover, characterized in that: The housing (1) is provided with a partition assembly (2), a monitoring mechanism (3), a safety module (4) and a safety controller (5); The partition assembly (2) includes a partition one (21) parallel to the opening of the housing (1) and a partition two (22) that cooperates with the partition one (21) to enclose different functional areas. The partition one (21) is located at the upper or lower part of the housing (1) and is connected to the housing (1) at both ends laterally. The side of the partition one (21) facing the opening of the housing (1) is called the busbar area, and the back side is called the common area. There are multiple partitions (22), and the multiple partitions (22) in the common area cooperate with the casing (1) wall panel to separate at least the inverter chamber, the switching chamber and the safety chamber. At least the inverter board is installed in the inverter chamber, at least the switching board is installed in the switching chamber, and at least the safety controller (5) is installed in the safety chamber. The monitoring mechanism (3) includes multiple smoke sensors (31) and / or temperature sensors (32) installed in each chamber, and the monitoring mechanism (3) is electrically connected to the safety controller (5). The insurance module (4) includes a fire extinguishing module (41) and a secondary switching module (42). The fire extinguishing module (41) is provided with multiple fire extinguishing pipes (412) that are connected to each chamber and area respectively, and the fire extinguishing pipes (412) are equipped with solenoid valves (413) that are electrically connected to the safety controller (5). One end of the secondary switching module (42) is electrically connected to the DC bus in the housing (1), and the other end is electrically connected to the input side of the inverter board in at least one adjacent housing (1). The secondary switching module (42) is electrically connected to the safety controller (5), which is used to electrically connect to the control system of the bidirectional converter and to control the on / off switching circuit of the secondary switching module (42).

2. The buried energy storage bidirectional converter control device for railway environments according to claim 1, characterized in that: The inverter chamber and the switching chamber are arranged and adjacent to each other along the length of the partition (21). The safety chamber is divided into two sections, one of which is located above or below the inverter chamber and the switching chamber to accommodate the fire extinguishing module (41), and the other section extends to the arrangement direction of the inverter chamber and the switching chamber to accommodate the safety controller (5). A diversion pipe (411) is fixed on the partition (21) along the length direction. Multiple pipe joints are installed on the diversion pipe (411), and the pipe joints are connected to the fire extinguishing module (41) and the fire extinguishing pipeline (412).

3. The buried energy storage bidirectional converter control device for railway environments according to claim 2, characterized in that: The connection point of the secondary switching module (42) and the DC bus is located outside the inverter chamber and the switching chamber, and is close to the section of the secondary switching module (42) installed in the fuse chamber; a tertiary switching module (43) is installed in the bus area, the tertiary switching module (43) is connected in series with the DC bus and is located between the connection point of the inverter board and the DC bus, and the connection point of the secondary switching module (42) and the DC bus, and the tertiary switching module (43) is electrically connected to the safety controller (5).

4. The buried energy storage bidirectional converter control device for railway environments according to claim 3, characterized in that: The secondary switching module (42) includes at least two relay units and corresponding external connecting wires. The external connecting wires are electrically connected to the DC bus in different housings (1). The normally open contacts of the relay units are connected in series with the external connecting wires and the control terminals are electrically connected to the safety controller (5).

5. The buried energy storage bidirectional converter control device for railway environments according to claim 4, characterized in that: The three-level switching module (43) includes another set of relay units, and the normally closed contacts of the relay units are connected in series with the DC bus, or the normally open contacts are connected in series with the DC bus, and the safety controller (5) controls the normally open contacts to close at least before the control of the two-level switching module (42) is turned on.

6. The buried energy storage bidirectional converter control device for railway environments according to claim 2, characterized in that: The housing (1) has an emergency port that connects the safety chamber to the outside. The emergency port is located in a section of the safety chamber that is arranged in the direction of the inverter chamber and the switching chamber. A movable frame (6) and a drive unit (7) are provided in the safety chamber. The movable frame (6) is facing the emergency port and is slidably connected to the inner wall of the housing (1). A sealing unit plate (61) is fixed on one side of the movable frame (6). The sealing unit plate (61) is located outside the emergency port and has an area larger than the emergency port. The drive unit (7) is electrically connected to the safety controller (5) and is used to drive the movable frame (6) to extend out of the emergency port, at least the safety controller (5) is mounted on the movable frame (6).

7. The buried energy storage bidirectional converter control device for railway environments according to claim 6, characterized in that: The housing (1) is also provided with an internal heat dissipation device, which includes a partition three (81), a circulation pump (82) and a circulation pipe. The partition three (81) is located on the side of the partition one (21) facing the opening of the housing (1) and has a liquid flow channel inside. The length of the partition three (81) extends along the width of the partition one (21). The DC bus is installed between the partition three (81) and the end of the housing (1); The circulating pump (82) forms a liquid flow circulation through the liquid flow channel in the partition plate three (81) via the circulating pipe, and the circulating pipe passes through the heat dissipation structure inside or outside the housing (1).

8. The buried energy storage bidirectional converter control device for railway environments according to claim 7, characterized in that: The drive unit (7) includes an air tank (71), an air cylinder (72), an air pressure sensor (73), and an air valve (74). The air cylinder (72) is installed in the housing (1) and the telescopic rod is connected to the movable frame (6). The air tank (71) is connected to an air pipe and the air pipe is connected to the cylinder body of the air cylinder (72). The air valve (74) is installed on the air pipe and electrically connected to the safety controller (5). A section of the circulating pipe for the cooled coolant is arranged around the air tank (71) and / or the air tank (71) is arranged on the front of the partition one (21) and located outside the partition three (81). The air pressure sensor (73) is installed on the air tank (71) and the detection end extends into the air tank (71).

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