Group string type current transforming and boosting device

Abstract

The utility model relates to the technical field of current-transforming and voltage-boosting layout, and specifically relates to a string-type current-transforming and voltage-boosting device. Comprising a skid-mounted platform; the plurality of integrated cabinets are arranged on the skid-mounted platform, a PCS is arranged in each integrated cabinet, and the plurality of integrated cabinets and the skid-mounted platform form an integrated platform; and the box-type substation and the integrated platform are separately arranged, and the box-type substation is electrically connected with the PCS. And the PCS is arranged on the integrated cabinet, so that the space utilization rate of the skid-mounted platform is increased. The number of oil-immersed transformers, accident oil pools, medium-voltage cabinets, medium-voltage cables and cable terminals, box transformer measurement and control devices and the like is reduced by half, the occupied area is greatly reduced, and the cost is reduced by about 35%; the number of oil-immersed transformers is reduced, the failure rate is reduced, and the maintenance cost is low; the number of oil-immersed transformers is small, the number of box transformer measurement and control devices is reduced, the on-site communication debugging workload is reduced, and the on-site debugging period and the labor cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of current conversion and voltage boosting layout, in particular to a group string type current conversion and voltage boosting device. Background Art

[0002] The existing high-power string energy storage converter and booster integrated solution mainly consists of 16 186kW PCSs with 3150kVA dry / oil-immersed types, which are arranged on a 20-foot skid-mounted platform. In addition, it is matched with several sets of 3MWh 20-foot container battery systems to form a 1C and below energy storage system; for a 100MW energy storage power station, 34 of the above 3150kVA energy storage converter and booster integrated machines are required.

[0003] Among them, when the existing energy storage converter and booster integrated unit is arranged on a skid-mounted platform, the distribution of the PCS is relatively messy, and the space utilization rate of the skid-mounted platform is relatively low. Utility Model Content

[0004] Therefore, the utility model aims to overcome the technical problems in the prior art, thereby providing a string-type current conversion and voltage boosting device.

[0005] The utility model provides a string type current conversion and voltage boosting device, comprising:

[0006] Skid-mounted platforms;

[0007] Several integrated cabinets are arranged on the skid-mounted platform, and PCS is arranged inside. Several integrated cabinets and the skid-mounted platform constitute an integrated platform;

[0008] The box-type substation is arranged separately from the integrated platform, and the box-type substation is electrically connected to the PCS.

[0009] Furthermore, a plurality of the integrated cabinets are arranged in a plurality of columns on the skid-mounted platform, and a maintenance passage is provided between each column of the integrated cabinets and adjacent integrated cabinets.

[0010] Furthermore, the integrated cabinet includes:

[0011] A combiner cabinet is arranged on a skid-mounted platform, and the combiner cabinet is provided with a connecting copper busbar for electrically connecting the box-type substation and the PCS;

[0012] There are four fixed brackets, which are arranged above the combiner cabinet, and the PCS is arranged in the fixed brackets.

[0013] Furthermore, the box-type substation includes a medium-voltage room, a transformer room, a low-voltage room and a distribution room.

[0014] Furthermore, the transformer room is located between the medium voltage room and the low voltage room, the power distribution room is arranged below the medium voltage room, the medium voltage room includes a medium voltage cabinet, and the medium voltage cabinet is suitable for connecting the collector line.

[0015] Further, the transformer room is provided with an oil-immersed transformer, and the oil-immersed transformer is electrically connected to the PCS;

[0016] The oil-immersed transformer is suitable for boosting the low-voltage AC voltage output by the PCS inverter to the grid voltage, or stepping down the grid voltage to the low-voltage AC voltage on the PCS rectifier input side, and isolating medium and low voltage equipment.

[0017] Furthermore, the low-voltage room includes a low-voltage cabinet A and a low-voltage cabinet B, and the low-voltage cabinet A and the low-voltage cabinet B are electrically connected to the AC side of the PCS respectively, and are connected to the low-voltage side of the oil-immersed transformer after convergence.

[0018] Furthermore, the distribution room includes an auxiliary transformer and a distribution circuit, which are suitable for providing auxiliary power for the box-type substation.

[0019] Furthermore, a detachable grid cover is provided on the top of the transformer chamber.

[0020] Furthermore, the medium voltage chamber is provided with an indoor lead-acid battery UPS, and the medium voltage chamber dissipates heat through air conditioning.

[0021] The technical solution of the utility model has the following advantages:

[0022] The utility model provides a string-type current conversion and boosting device, which increases the space utilization rate of the skid-mounted platform by setting the PCS on the integrated cabinet. The number of oil-immersed transformers, accident oil pools, medium-voltage cabinets, medium-voltage cables and cable terminals, and box-type transformer measurement and control devices are reduced by half, the floor space is greatly reduced, and the cost is reduced by about 35%; the number of oil-immersed transformers is reduced, the failure rate is reduced, and the maintenance cost is low; the number of oil-immersed transformers is small, the box-type transformer measurement and control devices are reduced, and the workload of on-site communication debugging is reduced, which greatly reduces the on-site debugging cycle and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the integrated platform structure of the utility model;

[0025] Figure 2 This is a structural schematic diagram of a box-type substation of the utility model.

[0026] Description of reference numerals;

[0027] 1. Skid-mounted platform; 2. Integrated cabinet; 3. Maintenance channel; 4. Combiner cabinet; 5. Fixed bracket; 6. PCS; 7. Medium voltage room; 8. Transformer room; 9. Low voltage room; 10. Distribution room; 11. Medium voltage cabinet; 12. Oil-immersed transformer; 13. Low voltage cabinet A; 14. Low voltage cabinet B. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example

[0033] Power Conversion System (PCS) is a device that realizes bidirectional conversion of electric energy in an electrochemical energy storage system, connected between the battery system and the power grid (and / or load). It can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to the AC load without a power grid. PCS consists of a DC / AC bidirectional converter, a control unit, etc. The PCS controller receives background control instructions through communication, and controls the converter to charge or discharge the battery according to the sign and size of the power instruction, thereby adjusting the active power and reactive power of the power grid. At the same time, PCS can obtain battery pack status information through CAN interface communication with BMS, dry contact transmission, etc., and can realize protective charging and discharging of the battery to ensure safe battery operation.

[0034] Generally, the existing high-power string energy storage converter and booster integrated solution has the following problems:

[0035] 1. For large ground power stations, the number of transformers and medium-voltage switch cabinets required for a 20-foot platform converter and booster is large, and the cost is high;

[0036] 2. Oil-immersed transformers require the installation of an emergency oil pool on the foundation. The large number of transformers leads to high foundation construction costs;

[0037] 3. Oil-immersed transformers have a high risk of oil leakage, and a large number of transformers will increase the probability of oil leakage accidents;

[0038] 4. According to fire protection regulations, the protective distance between the oil-immersed transformer and the battery prefabricated cabin needs to be 10m. The large number of transformers results in a large area for the entire ground power station and high initial investment costs.

[0039] like Figure 1 to Figure 2 A specific implementation of a string-type current conversion and boosting device is shown, and the string-type current conversion and boosting device includes:

[0040] Skid-mounted platform 1;

[0041] Several integrated cabinets 2 are arranged on the skid-mounted platform 1, and PCS6 is arranged inside. There may be eight sets of integrated cabinets 2, and the specification of PCS6 may be 186kW*4. Several integrated cabinets 2 and the skid-mounted platform 1 constitute an integrated platform;

[0042] The box-type substation is arranged separately from the integrated platform, and the box-type substation is electrically connected to the PCS6.

[0043] Furthermore, a plurality of the integrated cabinets 2 are arranged in a plurality of columns on the skid-mounted platform 1 , and a maintenance passage 3 is provided between each column of the integrated cabinets 2 and adjacent integrated cabinets 2 .

[0044] Furthermore, the integrated cabinet 2 includes:

[0045] The combiner cabinet 4 is arranged on the skid-mounted platform 1, and is mainly used to protect the AC and DC sides of the PCS6, and to provide a connecting copper bar connected to the battery cluster and the low-voltage cabinet side of the box-type substation. The combiner cabinet 4 is provided with a connecting copper bar for electrically connecting the box-type substation and the PCS6;

[0046] There are four fixed brackets 5, which are arranged above the combiner cabinet 4. The PCS 6 is arranged in the fixed brackets 5, and is mainly used to realize the bidirectional conversion of electric energy and control the charging and discharging process of the battery.

[0047] Furthermore, the box-type substation includes a medium-voltage chamber 7, a transformer chamber 8, a low-voltage chamber 9 and a distribution chamber 10. The transformer chamber 8 is located between the medium-voltage chamber 7 and the low-voltage chamber 9, and the distribution chamber 10 is arranged below the medium-voltage chamber 7.

[0048] Furthermore, the medium voltage chamber 7 includes a medium voltage cabinet 11 , which is suitable for connecting a collector line. The medium voltage cabinet 11 is used to connect the collector line and other box-type substations, and to protect an oil-immersed transformer 12 .

[0049] Further, the transformer chamber 8 is provided with an oil-immersed transformer 12, and the oil-immersed transformer 12 is electrically connected to the PCS 6;

[0050] The oil-immersed transformer 12 is suitable for boosting the low-voltage AC voltage output by the PCS6 inverter to the grid voltage, or stepping down the grid voltage to the low-voltage AC voltage on the PCS6 rectifier input side, and isolating medium and low voltage equipment.

[0051] Furthermore, the low-voltage chamber 9 includes a low-voltage cabinet A13 and a low-voltage cabinet B14, which are electrically connected to the AC side of the PCS6 respectively and connected to the low-voltage side of the oil-immersed transformer 12 after convergence.

[0052] Furthermore, the distribution room 10 includes an auxiliary transformer and a distribution circuit, which is suitable for providing auxiliary power for the box-type substation.

[0053] Furthermore, a removable mesh cover is provided on the top of the transformer chamber 8. The mesh size of the removable mesh cover is 50mm*50mm. The box-type substation belongs to the medium voltage system. During normal use, a mesh cover will be installed on the top of the transformer chamber 8, which mainly serves to prevent foreign objects from entering from the top and ensure the safe operation of the equipment. In addition, the use of a removable mesh cover instead of a closed cover is mainly considered that the removable mesh cover can quickly disperse the high-temperature air gathered on the top of the transformer to the outside of the box-type substation, which can better assist the transformer in heat dissipation and reduce the temperature rise of the transformer. At the same time, after the removable mesh cover is removed, the oil-immersed transformer 12 can be hoisted in and out, ensuring convenient maintenance of the oil-immersed transformer 12 in the later stage.

[0054] Furthermore, the medium voltage chamber 7 is provided with an indoor lead-acid battery UPS, and the medium voltage chamber 7 dissipates heat through air conditioning. On the one hand, the cost of indoor lead-acid battery UPS is greatly reduced compared with outdoor lithium battery UPS. On the other hand, the operating environment temperature of outdoor lead-acid battery UPS is generally 0-40°C. For the Middle East, the maximum ambient temperature of box-type substations is generally over 40°C. If blinds + fans are used for heat dissipation, the failure rate of UPS will be greatly increased, which ensures that UPS operates at the required operating temperature and greatly improves product reliability.

[0055] In the current large-scale ground power station energy storage projects, such as 100MW / 200MWh energy storage projects, 34 sets of 3150kVA converters and boosters are required, but for the 6300kVA converter and booster device of this application, 17 sets are required. The number of PCS6 integrated cabinets 2 used in the project is the same, but the layout of this application reduces the number of oil-immersed transformers 12, accident oil pools, medium-voltage cabinets 11, medium-voltage cables and cable terminals, and box transformer measurement and control devices by half, which greatly reduces the floor space and reduces the cost by about 35%; the number of oil-immersed transformers 12 is reduced, the failure rate is reduced, and the maintenance cost is low; the number of oil-immersed transformers 12 is small, the box transformer measurement and control devices are reduced, and the workload of on-site communication debugging is reduced, which greatly reduces the on-site debugging cycle and labor costs.

[0056] The present application sets up the box-type substation separately from the integrated platform so as to increase the power of the transformer unit, thereby reducing the number of oil-immersed transformers 12 and their supporting equipment, thereby greatly reducing investment costs and maintenance costs.

[0057] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A string type current conversion and voltage boosting device, characterized in that: include: Skid-mounted platform (1); A plurality of integrated cabinets (2) are arranged on the skid-mounted platform (1), and a PCS (6) is arranged inside the integrated cabinets (2). The plurality of integrated cabinets (2) and the skid-mounted platform (1) form an integrated platform; The box-type substation is arranged separately from the integrated platform, and the box-type substation is electrically connected to the PCS (6).

2. The string-type current conversion and voltage boosting device according to claim 1, characterized in that: A plurality of the integrated cabinets (2) are arranged in a plurality of rows on the skid-mounted platform (1), and a maintenance passage (3) is provided between each row of the integrated cabinets (2) and adjacent integrated cabinets (2).

3. The string-type current conversion and voltage boosting device according to claim 1, characterized in that: The integrated cabinet (2) comprises: A combiner cabinet (4) is arranged on the skid-mounted platform (1), and the combiner cabinet (4) is provided with a connecting copper busbar for electrically connecting the box-type substation and the PCS (6); There are four fixed brackets (5) arranged above the junction cabinet (4), and the PCS (6) is arranged inside the fixed brackets (5).

4. The string type current conversion and voltage boosting device according to claim 1, characterized in that: The box-type transformer substation comprises a medium voltage room (7), a transformer room (8), a low voltage room (9) and a power distribution room (10).

5. The string-type current conversion and voltage boosting device according to claim 4, characterized in that: The transformer room (8) is located between the medium voltage room (7) and the low voltage room (9), the power distribution room (10) is arranged below the medium voltage room (7), the medium voltage room (7) comprises a medium voltage cabinet (11), and the medium voltage cabinet (11) is suitable for connecting a collector line.

6. The string-type current conversion and voltage boosting device according to claim 4, characterized in that: The transformer chamber (8) is provided with an oil-immersed transformer (12), and the oil-immersed transformer (12) is electrically connected to the PCS (6); The oil-immersed transformer (12) is suitable for boosting the low-voltage AC voltage output by the PCS (6) inverter to the grid voltage, or for stepping down the grid voltage to the low-voltage AC voltage on the rectifier input side of the PCS (6), and for isolating medium and low voltage equipment.

7. The string type current conversion and voltage boosting device according to claim 6, characterized in that: The low-voltage room (9) comprises a low-voltage cabinet A (13) and a low-voltage cabinet B (14), wherein the low-voltage cabinet A (13) and the low-voltage cabinet B (14) are respectively electrically connected to the AC side of the PCS (6) and are connected to the low-voltage side of the oil-immersed transformer (12) after convergence.

8. The string-type current conversion and voltage boosting device according to claim 4, characterized in that: The power distribution room (10) comprises an auxiliary transformer and a power distribution circuit, and is suitable for providing auxiliary power for the box-type substation.

9. The string type current conversion and voltage boosting device according to claim 4, characterized in that: A detachable grid cover is provided on the top of the transformer chamber (8).

10. The string type current conversion and voltage boosting device according to claim 4, characterized in that: The medium-voltage chamber (7) is provided with an indoor lead-acid battery UPS, and the medium-voltage chamber (7) dissipates heat through air conditioning.

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