High-capacity photovoltaic boost substation

Abstract

The utility model relates to the technical field of photovoltaic power generation, and discloses a high-capacity photovoltaic boost transformer station, which comprises a low-voltage cabinet, a transformer chamber and a medium-voltage chamber, a power distribution area, a confluence area and a detection area are arranged in the low-voltage cabinet, so that all low-voltage elements can be integrally arranged according to functions, and an external cabinet body of the medium-voltage chamber is provided with a data acquisition module and a heat dissipation module; the medium-voltage chamber comprises a medium-voltage incoming and outgoing line cabinet, a medium-voltage circuit breaker switch cabinet and four medium-voltage PT cabinets. The medium-voltage PT cabinets comprise an incoming line cabinet, an internal connection transformer switch cabinet, an outgoing line cabinet and a metering protection PT cabinet used for metering protection. According to the high-capacity photovoltaic boosting transformer substation, the low-voltage cabinet adopts a partition design, so that the wiring distance is shortened, the integration level is improved, meanwhile, the data acquisition module is externally arranged, so that electromagnetic interference is reduced, high-precision measurement and accurate forwarding of signals are ensured, and precise metering protection of the medium-voltage cabinet is realized through the PT cabinet for metering protection.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, and more specifically, to a large-capacity photovoltaic step-up substation. Background Technology

[0002] In existing technologies, large-capacity photovoltaic step-up substations are typically designed as prefabricated boxes, with the low-voltage compartment, transformer compartment, and medium-voltage compartment all integrated within the box structure. The low-voltage components within the low-voltage compartment are relatively dispersed, leading to messy and complex wiring, poor reliability, high failure rate, and difficulty in installation and maintenance. Furthermore, it increases electromagnetic interference between components, resulting in significant harmonics and interference affecting low-voltage measurement and control elements, leading to lower measurement accuracy. Simultaneously, existing medium-voltage compartments struggle to provide accurate metering and protection.

[0003] In summary, how to reduce electromagnetic interference between low-voltage components to improve measurement accuracy is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a large-capacity photovoltaic step-up substation. The low-voltage cabinet adopts a partitioned design to shorten the wiring distance and improve the integration. At the same time, the data acquisition module is external to reduce electromagnetic interference, ensuring high-precision measurement and accurate signal forwarding. A PT cabinet for metering protection is provided in the medium-voltage room to achieve precise metering protection.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A large-capacity photovoltaic step-up substation includes a low-voltage cabinet, a transformer room, and a medium-voltage room. The low-voltage cabinet is equipped with a power distribution area, a current collection area, and a detection area to integrate various low-voltage components according to their functions. The external cabinet of the medium-voltage room is equipped with a data acquisition module and a heat dissipation module.

[0007] The medium-voltage room includes a medium-voltage incoming and outgoing line cabinet, a medium-voltage circuit breaker switch cabinet, and four medium-voltage PT cabinets. The medium-voltage PT cabinet includes an incoming line cabinet, an internally connected transformer switch cabinet, an outgoing line cabinet, and a PT cabinet for metering protection.

[0008] Preferably, the power distribution area is equipped with a centralized power distribution cabinet, an auxiliary transformer and a UPS. The auxiliary transformer is connected to the main power grid, and both the auxiliary transformer and the UPS are connected to the centralized power distribution cabinet.

[0009] Preferably, the detection area includes an insulation detection device and a measurement and control device, both of which are connected to the centralized power distribution cabinet.

[0010] Preferably, the busbar area is equipped with a busbar frame circuit breaker, the output terminal of the busbar frame circuit breaker is connected to the centralized distribution cabinet, and the input terminal of the busbar frame circuit breaker is connected to at least one photovoltaic inverter, with each photovoltaic inverter and circuit breaker connected in a one-to-one correspondence.

[0011] Preferably, the busbar area includes a first busbar area and a second busbar area, the busbar frame circuit breaker is located in the first busbar area, and each of the first busbar area and the second busbar area is equipped with one of the photovoltaic inverters.

[0012] Preferably, the power distribution area, the first busbar area, the detection area, and the second busbar area are all arranged horizontally along the length of the low-voltage switchgear, and the power distribution area, the detection area, the first busbar area, and the second busbar area are all arranged front-to-back along the width of the low-voltage switchgear.

[0013] Preferably, the transformer room and the medium-voltage room are both located inside the enclosure structure, the low-voltage cabinet is located outdoors, and the low-voltage cabinet is equipped with a temperature control device for maintaining constant temperature and humidity inside the cabinet.

[0014] Preferably, the top of the transformer room is provided with lateral heat dissipation holes, which are used to increase the ventilation area at the top of the transformer room.

[0015] Preferably, the side panel of the transformer compartment includes a high-strength mesh plate, and the high-strength mesh plate array has a plurality of through mesh holes to increase the ventilation area of ​​the side panel.

[0016] Preferably, the busbar area, the power distribution area, and the detection area are arranged in a triangular pattern within the low-voltage cabinet.

[0017] The large-capacity photovoltaic step-up substation provided by this utility model has a distribution area, a combiner area and a detection area in the low-voltage cabinet. According to the function, the low-voltage components that need to be electrically connected can be integrated and installed in the same area. The layout is reasonable and allows for close-range wiring, avoiding the wiring confusion and complexity caused by long-distance wiring. It has high integration, high space utilization, and strong reliability. It also helps to reduce harmonics and electromagnetic interference in the low-voltage cabinet and ensures the measurement accuracy of the measurement and control components in the detection area.

[0018] Meanwhile, the external design of the data acquisition module in the step-up substation significantly reduces the electromagnetic interference of internal components to the data acquisition module, ensuring high-precision measurement and accurate signal forwarding.

[0019] Furthermore, the medium-pressure chamber adopts a four-medium-pressure PT cabinet design, which achieves precise metering protection by adding a PT cabinet for metering protection. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 A front view schematic diagram of a specific embodiment of the large-capacity photovoltaic step-up substation provided by this utility model;

[0022] Figure 2 for Figure 1 A left-view diagram;

[0023] Figure 3 for Figure 1 A diagram showing the view from the right.

[0024] Figure 4 for Figure 1 A top-down view;

[0025] Figure 5 for Figure 1 A front view diagram excluding the low-voltage switchgear door and cabinet structure;

[0026] Figure 6 for Figure 5 A left-view diagram;

[0027] Figure 7 for Figure 5 Rear view diagram;

[0028] Figure 8 This is a schematic diagram of the structure of a medium-voltage switchgear.

[0029] Figures 1-8 middle:

[0030] 10-Low-voltage switchgear; 11-Busseter frame circuit breaker; 12-Centralized distribution cabinet; 13-Auxiliary transformer; 14-UPS; 15-Insulation detection device; 16-Measurement and control device; 17-Photovoltaic inverter; 20-Transformer room; 30-Medium-voltage room; 31-Medium-voltage PT cabinet; 32-Medium-voltage incoming and outgoing line cabinet; 33-Medium-voltage circuit breaker switchgear; 40-Data acquisition module. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The core of the utility model is to provide a large-capacity photovoltaic step-up substation. The low-voltage cabinet adopts a partition design to shorten the wiring distance and improve the integration degree. At the same time, the data acquisition module is externally placed to reduce electromagnetic interference, ensuring high-precision measurement and accurate signal forwarding. A PT cabinet for metering and protection is provided in the medium-voltage room, achieving precise metering and protection.

[0033] The large-capacity photovoltaic step-up substation provided by the utility model includes a low-voltage cabinet 10, a transformer room 20, and a medium-voltage room 30. The low-voltage cabinet 10 is provided with a power distribution area, a busbar area, and a detection area to integrate each low-voltage component according to the function. The external cabinet of the medium-voltage room 30 is provided with a data acquisition module 40 and a heat dissipation module;

[0034] The medium-voltage room 30 includes a medium-voltage incoming and outgoing line cabinet 32, a medium-voltage circuit breaker switch cabinet 33, and four medium-voltage PT cabinets 31. The medium-voltage PT cabinet 31 includes an incoming line cabinet, an internal connection transformer switch cabinet, an outgoing line cabinet, and a metering protection PT cabinet for metering and protection.

[0035] Among them, the low-voltage cabinet 10 is located in an outdoor environment for the maintenance and repair of each low-voltage component inside the cabinet. The transformer room 20 and the medium-voltage room 30 are both located inside a box structure made of insulating materials to ensure the safety of the step-up substation;

[0036] The data acquisition module 40 is used to obtain parameters such as voltage and current at the output end of the step-up substation. In order to reduce the electromagnetic interference of internal components, improve the measurement accuracy and the accuracy of forwarding signals, the data acquisition module 40 is placed on the external cabinet of the medium-voltage room 30, and the box structure and the external cabinet are used to reduce electromagnetic interference to ensure the measurement accuracy and accurate signal forwarding of the data acquisition module 40;

[0037] The heat dissipation module is used to maintain the ambient temperature of both the transformer room 20 and the medium-voltage room 30 to ensure the normal operation of the equipment.

[0038] The specific models, structures, installation positions, installation methods, etc. of the data acquisition module 40 and the heat dissipation module are determined according to the actual production needs by referring to the existing technology and will not be elaborated here.

[0039] The low-voltage cabinet 10 is provided with a power distribution area, a busbar area, and a detection area. Each partition of the low-voltage cabinet 10 integrates the low-voltage components according to their functions to achieve short-distance wiring of the low-voltage components and reduce wiring problems caused by long-distance wiring. Preferably, the busbar area, the power distribution area, and the detection area are arranged in a "pin" shape in the low-voltage cabinet 10.

[0040] The medium-voltage compartment 30 includes four medium-voltage cabinets 31. Among them, the incoming cabinet, the internally connected transformer switch cabinet, and the outgoing cabinet are conventional three-medium-voltage PT cabinet designs. The specific types, models, distributions, and connection relationships of the three can be determined with reference to existing technologies according to the actual production needs.

[0041] The PT cabinet for metering protection can display voltage and current, facilitating the monitoring and control of local components without the need for remote monitoring and control, which helps improve detection accuracy. At the same time, the PT measurement and protection cabinet can protect the measurement and control components, avoiding the impact of low-voltage side current and voltage harmonics on the measurement accuracy of the medium-voltage side measurement and control unit, making the measurement and control accuracy of the medium-voltage side higher and more accurate.

[0042] In this embodiment, the low-voltage cabinet 10 is provided with a power distribution area, a busbar area and a detection area. Low-voltage components that require electrical connection can be integrated and installed in the same area according to their functions. The layout is reasonable and allows for close-range wiring, avoiding the wiring confusion and complexity caused by long-distance wiring. It has high integration, high space utilization, and strong reliability. It also helps to reduce harmonics and electromagnetic interference in the low-voltage cabinet 10 and ensures the measurement accuracy of the measurement and control components in the detection area.

[0043] Meanwhile, the external design of the data acquisition module 40 in the step-up substation significantly reduces the electromagnetic interference of internal components to the data acquisition module 40, ensuring high-precision measurement and accurate signal forwarding.

[0044] Furthermore, the medium-pressure chamber 30 adopts a four-medium-pressure PT cabinet design, which achieves precise metering protection by adding a PT cabinet for metering protection.

[0045] Based on the above embodiments, the power distribution area of ​​the low-voltage cabinet 10 is defined. The power distribution area is equipped with a centralized power distribution cabinet 12, an auxiliary transformer 13 and a UPS 14. The auxiliary transformer 13 is connected to the main power grid, and both the auxiliary transformer 13 and the UPS 14 are connected to the centralized power distribution cabinet 12.

[0046] The centralized power distribution cabinet 12 is connected to the transformer room 20 and is used to collect and distribute electrical energy. The auxiliary transformer 13 is connected to the main power grid and the centralized power distribution cabinet 12 and is used for the normal power supply of the centralized power distribution cabinet 12. The UPS 14 is also connected to the centralized power distribution cabinet 12 and is used for the emergency power supply of the centralized power distribution cabinet 12.

[0047] The specific types, models, and connection methods of the centralized distribution cabinet 12, auxiliary transformer 13, and UPS 14 can be referred to the existing step-up substation settings according to actual production needs, and will not be elaborated here.

[0048] In this embodiment, the centralized power distribution cabinet 12, auxiliary transformer 13 and UPS 14 are all located in the power distribution area. Compared with the three being dispersed in the low-voltage cabinet 10, the wiring distance between each component is significantly shortened, which not only improves the integration of components in the low-voltage cabinet 10, but also facilitates the wiring layout in the low-voltage cabinet 10.

[0049] Based on the above embodiments, the structure of the detection area is defined, and the detection area can be set to include an insulation detection device 15 and a measurement and control device 16. Both the insulation detection device 15 and the measurement and control device 16 are connected to the centralized distribution cabinet 12. The specific types, models and connection methods of the insulation detection device 15 and the measurement and control device 16 are set according to the actual production needs and refer to the existing step-up substation settings, which will not be elaborated here.

[0050] In this embodiment, the insulation detection device 15 and the measurement and control device 16 are centrally located in the detection area, which helps to simplify the wiring inside the low-voltage cabinet 10 and facilitates close-range wiring between the centralized distribution cabinet 12 and the insulation detection device 15 and the measurement and control device 16.

[0051] Based on the above embodiments, the structure of the busbar area is further defined. A busbar frame circuit breaker 11 can be provided in the busbar area. The output terminal of the busbar frame circuit breaker 11 is connected to the centralized distribution cabinet 12, and the input terminal of the busbar frame circuit breaker 11 is connected to at least one photovoltaic inverter 17. The photovoltaic inverter 17 is connected to the circuit breaker in a one-to-one correspondence.

[0052] Among them, the photovoltaic inverter 17 is used to connect to the photovoltaic modules that generate photovoltaic power. Each photovoltaic inverter 17 is equipped with a circuit breaker to ensure the safety of each photovoltaic inverter 17.

[0053] The photovoltaic inverter 17 is connected to the busbar circuit breaker 11. The electrical energy generated by the photovoltaic module is input into the busbar circuit breaker 11 through the photovoltaic inverter 17, and then input into the centralized distribution cabinet 12 through the busbar circuit breaker 11. From the centralized distribution cabinet 12, it is input into the transformer room 20 for voltage boosting. The busbar circuit breaker 11 is used to isolate each photovoltaic inverter 17 from the centralized distribution cabinet 12, thus serving as the main protection device for the photovoltaic inverter 17 and undertaking functions such as overload and short circuit protection.

[0054] When there is more than one photovoltaic inverter 17, the combiner area can be further divided, and each photovoltaic inverter 17 can be placed in a different combiner zone. This facilitates short-distance wiring, improves heat dissipation of the photovoltaic inverter 17, and enhances the safety and reliability of the line layout.

[0055] For example, please refer to Figure 6 and Figure 7When the low-voltage switchgear 10 is equipped with two photovoltaic inverters 17, the combiner area includes a first combiner area and a second combiner area. The combiner frame circuit breaker 11 is located in the first combiner area, and each of the first and second combiner areas is equipped with one photovoltaic inverter 17.

[0056] Preferably, in order to further optimize the line layout, save the number of cables, improve the reliability of operation and maintenance and reduce the maintenance cost, the power distribution area and the first busbar area, as well as the detection area and the second busbar area can be set to be arranged left and right along the length of the low-voltage cabinet 10, and the power distribution area and the detection area, as well as the first busbar area and the second busbar area can be set front and back along the width of the low-voltage cabinet 10.

[0057] It should be noted that the length and width directions of the low-voltage switchgear 10 here refer to... Figure 6 The length and width directions of the low-voltage switchgear 10 shown are those of the low-voltage switchgear itself, not the length and width directions of the entire step-up substation.

[0058] Based on the above embodiments, the transformer room 20 and the medium-voltage room 30 are both located inside the enclosure structure, while the low-voltage cabinet 10 is located in the outdoor environment. The internal environment of the low-voltage cabinet 10, such as ambient temperature and humidity, is easily affected by the external environment. In order to maintain the relative stability of the internal environment of the low-voltage cabinet 10 so that its internal components can work normally, the low-voltage cabinet 10 is equipped with a temperature control device for maintaining constant temperature and humidity inside the cabinet.

[0059] The temperature control device is preferably set as an air conditioner rather than a cooling fan, in order to meet the temperature control needs of the large space of the low-voltage cabinet 10.

[0060] Based on the above embodiments, the top of the transformer room 20 is provided with lateral heat dissipation holes, which are used to increase the ventilation area at the top of the transformer room 20 and improve the heat dissipation effect at the top of the transformer room 20.

[0061] The side plate of the transformer chamber 20 includes a high-strength mesh plate. The high-strength mesh plate array has several through holes. The holes can serve as heat dissipation holes to increase the ventilation area of ​​the side plate, thereby improving the lateral heat dissipation effect of the pressure plate chamber 20.

[0062] It should be noted that the "first" and "second" in the "first busbar area" and "second busbar area" mentioned in this application are only used to distinguish the different locations and do not contain any limitation on the order.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0064] The above provides a detailed description of the large-capacity photovoltaic step-up substation provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A large-capacity photovoltaic step-up substation, characterized in that, It includes a low-voltage cabinet (10), a transformer room (20) and a medium-voltage room (30). In the low-voltage cabinet (10), there are a power distribution area, a busbar area and a detection area, so as to integrate and arrange each low-voltage component according to functions. On the external cabinet of the medium-voltage room (30), there are a data acquisition module (40) and a heat dissipation module; The medium-voltage room (30) includes a medium-voltage incoming and outgoing line cabinet (32), a medium-voltage circuit breaker switch cabinet (33) and four medium-voltage PT cabinets (31). The medium-voltage PT cabinet (31) includes an incoming line cabinet, an internal connection transformer switch cabinet, an outgoing line cabinet and a metering protection PT cabinet for metering protection.

2. The large-capacity photovoltaic step-up substation according to claim 1, characterized in that, In the power distribution area, there are a centralized power distribution cabinet (12), an auxiliary transformer (13) and a UPS (14). The auxiliary transformer (13) is connected to the main power grid, and both the auxiliary transformer (13) and the UPS (14) are connected to the centralized power distribution cabinet (12).

3. The large-capacity photovoltaic step-up substation according to claim 2, characterized in that, The detection area includes an insulation detection device (15) and a measurement and control device (16). Both the insulation detection device (15) and the measurement and control device (16) are connected to the centralized power distribution cabinet (12).

4. The large-capacity photovoltaic step-up substation according to claim 2, characterized in that, ​ 5. The large-capacity photovoltaic step-up substation according to claim 4, characterized in that, ​ 6. The large-capacity photovoltaic step-up substation according to claim 5, characterized in that, ​ 7. The large-capacity photovoltaic step-up substation according to any one of claims 1-6, characterized in that, ​ 8. The large-capacity photovoltaic step-up substation according to any one of claims 1-6, characterized in that, ​ 9. The large-capacity photovoltaic step-up substation according to claim 8, characterized in that, ​ 10. The large-capacity photovoltaic step-up substation according to any one of claims 1-6, characterized in that, ​

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