Wind generating set on-site boosting transformer substation based on DCB equipment

Abstract

The utility model relates to the technical field of circuit breakers, and provides a wind generating set on-site boost substation based on DCB equipment, which comprises a 66kV power distribution device arranged outside a wind generating set and electrically connected with a wind power plant collection booster station; the high-voltage side of the 66kV in-situ boosting transformer is electrically connected to the 66kV power distribution device; the low-voltage power distribution device is connected with the low-voltage side of the 66kV in-situ boosting transformer, the low-voltage power distribution device is integrated in the prefabricated cabin body, the low-voltage power distribution device is in communication connection with the wind power plant collection booster station, and the low-voltage power distribution device is connected with the wind generating set; according to the utility model, the DCB equipment is adopted to replace the traditional AIS equipment, the equipment number and spacing requirements are reduced, the occupied area and the operation and maintenance cost are also reduced, through the collaborative innovation of the DCB equipment and the prefabricated cabin technology, the early-stage installation difficulty and debugging difficulty are greatly reduced, and meanwhile, the remarkable effects of improving the space utilization rate and reducing the operation and maintenance cost are realized.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a local step-up substation for wind turbine generator sets based on DCB equipment. Background Technology

[0002] The trend of raising the output voltage level of large-capacity onshore wind turbine generators to 66kV has become mainstream, and the selection of switchgear for their local step-up systems faces the need for technical and economic optimization.

[0003] Currently, the mainstream solutions for outdoor 66kV step-up substations use gas-insulated switchgear (GIS) or air-insulated switchgear (AIS). The AIS solution requires disconnecting switches on both sides of the circuit breaker to achieve maintenance isolation. However, with the development of circuit breaker technology, modern circuit breakers have achieved a maintenance-free lifespan of over 12 years, and their reliability is significantly higher than that of disconnecting switches. Yet, the traditional AIS solution still requires disconnecting switches with high maintenance requirements to achieve circuit breaker maintenance isolation, resulting in equipment redundancy and high operation and maintenance costs. Utility Model Content

[0004] This utility model provides a local step-up substation for wind turbine generator sets based on DCB equipment, which solves the defects of existing step-up substations in terms of equipment redundancy and high operation and maintenance costs.

[0005] This utility model provides a local step-up substation for wind turbine generator sets based on DCB equipment, including:

[0006] A 66kV power distribution device is installed outside the wind turbine generator set, and the 66kV power distribution device is electrically connected to the wind farm's collection and step-up substation.

[0007] A 66kV local step-up transformer, wherein the high-voltage side of the 66kV local step-up transformer is electrically connected to the 66kV power distribution device;

[0008] The low-voltage power distribution device is connected to the low-voltage side of the 66kV local step-up transformer and is integrated into the prefabricated cabin. The low-voltage power distribution device is communicatively connected to the wind farm collection and step-up station and is connected to the wind turbine generator set.

[0009] According to the DCB-based wind turbine generator local step-up substation provided by this utility model, the 66kV power distribution device includes:

[0010] The isolating circuit breaker has one end connected to the wind farm collection and boosting station via a 66kV cable or overhead line, and the other end is electrically connected to the high-voltage side of the 66kV local boosting transformer.

[0011] An electronic current transformer is integrated on the isolating circuit breaker, and the electronic current transformer is connected to the protection and control device.

[0012] A grounding switch, one end of which is connected to the isolating circuit breaker.

[0013] The on-site step-up substation for wind turbine generators based on DCB equipment provided by this utility model also includes:

[0014] The control cabinet is communicatively connected to the wind farm's collection and booster station, and the control cabinet is equipped with:

[0015] An online monitoring device is used to monitor the SF6 gas pressure, moisture content, mechanical characteristics, and coil current of the 66kV power distribution device through sensors.

[0016] The intelligent terminal is used to perform intelligent control and status monitoring of the isolating circuit breaker;

[0017] The merging unit is used to synchronize, merge, and resample the sampled values ​​output by the electronic current transformer.

[0018] The on-site step-up substation for wind turbine generators based on DCB equipment provided by this utility model also includes:

[0019] A 66kV surge arrester, one end of which is connected to the wind farm's collection and booster station via a 66kV cable or overhead line, and the other end of which is grounded.

[0020] According to the DCB-based wind turbine generator local step-up substation provided by this utility model, the 66kV local step-up transformer is set on the foundation, and the foundation is set in the oil pit.

[0021] The on-site step-up substation for wind turbine generators based on DCB equipment provided by this utility model also includes a microcomputer-based five-prevention system. The microcomputer-based five-prevention system is installed in the prefabricated cabin and is connected to the prefabricated cabin and the low-voltage power distribution device.

[0022] According to the DCB-based wind turbine generator local step-up substation provided by this utility model, the low-voltage power distribution device is connected to the wind turbine through low-voltage cables and communication optical cables.

[0023] According to the DCB-based wind turbine generator local step-up substation provided by this utility model, the 66kV surge arrester adopts an AC gapless metal oxide surge arrester.

[0024] According to the DCB-based wind turbine generator local step-up substation provided by this utility model, the low-voltage power distribution device includes:

[0025] A current transformer, one end of which is connected to the low-voltage side of the 66kV local step-up transformer and the protection and control device;

[0026] A low-voltage circuit breaker, one end of which is connected to the other end of the current transformer, and the other end of which is connected to the fan converter cabinet.

[0027] A fuse, one end of which is connected to the other end of the current transformer;

[0028] A surge protector, one end of which is connected to the other end of the fuse, and the other end of which is grounded;

[0029] A low-voltage knife-type fuse switch, one end of which is connected to the other end of the current transformer;

[0030] A lighting maintenance transformer, wherein the lighting maintenance transformer is connected to the other end of the low-voltage knife switch;

[0031] A lighting maintenance busbar is provided, which is connected to the lighting maintenance transformer and the air switch respectively.

[0032] According to the DCB-based wind turbine generator local step-up substation provided by this utility model, the prefabricated cabin also includes:

[0033] An uninterruptible AC power supply system is connected to the low-voltage power distribution device.

[0034] This utility model provides a local step-up substation for wind turbine generators based on DCB equipment, comprising: a 66kV distribution device, a 66kV local step-up transformer, and a low-voltage distribution device. By replacing traditional AIS equipment with DCB equipment, the number of devices and spacing requirements are reduced, as well as the floor space and operation and maintenance costs are reduced. The high-voltage side of the 66kV local step-up transformer is connected to the 66kV distribution device, and the low-voltage side of the 66kV local step-up transformer is connected to the low-voltage distribution device, realizing smooth power transmission between different voltage levels. By adopting a factory-prefabricated modular cabin for the low-voltage distribution device, the compact design reduces the amount of on-site civil engineering, and the overall floor space can be reduced by about 30%-40% compared to the AIS solution. Through the synergistic innovation of DCB equipment and prefabricated cabin technology, the initial installation and commissioning difficulties are significantly reduced, while achieving significant improvements in space utilization and reductions in operation and maintenance costs. It not only solves the problems of large floor space and complex maintenance of traditional AIS equipment, but also provides technical support for the transformation of wind farms towards intelligent and unmanned operation and maintenance, and has significant economic value and social benefits. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a structural block diagram of a local step-up substation for wind turbine generator sets based on DCB equipment, provided in an embodiment of this utility model.

[0037] Figure 2 This is a connection diagram of a local step-up substation for wind turbine generator sets based on DCB equipment, provided in an embodiment of this utility model.

[0038] Figure 3 This is a schematic diagram of a partial connection structure of a local step-up substation for wind turbine generator sets based on DCB equipment, provided in an embodiment of this utility model.

[0039] Figure 4 This is a top view of a partial connection structure of a local step-up substation for wind turbine generator sets based on DCB equipment, provided in an embodiment of this utility model.

[0040] Figure label:

[0041] 1. 66kV power distribution equipment; 2. 66kV local step-up transformer; 3. Low-voltage power distribution equipment; 4. Wind farm collection and step-up substation; 5. Wind turbine generator set; 6. Foundation.

[0042] 11. Isolating circuit breaker; 12. Electronic current transformer; 13. Grounding switch; 14. 66kV surge arrester; 15. Live indicator;

[0043] 31. Current transformer; 32. Low-voltage circuit breaker; 33. Fuse; 34. Surge protector; 35. Low-voltage knife switch; 36. Lighting maintenance transformer; 37. Lighting maintenance busbar; 38. Uninterruptible AC power supply system. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] The following is combined Figures 1-4This invention describes a local step-up substation for wind turbine generator sets based on DCB equipment.

[0046] like Figure 1 As shown, this utility model embodiment provides a local step-up substation for wind turbine generator sets based on DCB equipment, including: a 66kV power distribution device 1, a 66kV local step-up transformer 2, and a low-voltage power distribution device 3.

[0047] The 66kV power distribution unit 1 is located outside the wind turbine generator set 5 and is electrically connected to the wind farm collection and boosting station 4; the high-voltage side of the 66kV local boosting transformer 2 is electrically connected to the 66kV power distribution unit 1; the low-voltage power distribution unit 3 is connected to the low-voltage side of the 66kV local boosting transformer 2, and the low-voltage power distribution unit 3 is integrated into the prefabricated cabin. The low-voltage power distribution unit 3 is communicatively connected to the wind farm collection and boosting station 4, and the low-voltage power distribution unit 3 is connected to the wind turbine generator set 5.

[0048] As can be seen from the above scheme, this utility model uses DCB equipment to replace traditional AIS equipment, reducing the number of equipment and spacing requirements, as well as the floor space and operation and maintenance costs. The high-voltage side of the 66kV local step-up transformer 2 is connected to the 66kV distribution device 1, and the low-voltage side of the 66kV local step-up transformer 2 is connected to the low-voltage distribution device 3, realizing smooth transmission of electrical energy between different voltage levels. By adopting a factory-prefabricated modular cabin for the low-voltage distribution device 3, the compact design reduces the amount of on-site civil engineering, and the overall floor space can be reduced by about 30%-40% compared to the AIS solution. Through the synergistic innovation of DCB equipment and prefabricated cabin technology, the difficulty of early installation and commissioning is greatly reduced, while achieving significant effects of improved space utilization and reduced operation and maintenance costs. It not only solves the problems of large floor space and complex maintenance of traditional AIS equipment, but also provides technical support for the transformation of wind farms towards intelligent and unmanned operation and maintenance, and has significant economic value and social benefits.

[0049] In this embodiment, the DCB device is an integrated intelligent disconnecting circuit breaker 11 (DCB), which is a current breaker that can meet the requirements of a disconnecting switch when the contacts are in the open position. The 66kV power distribution device 1 includes: disconnecting circuit breaker 11, electronic current transformer 12 and grounding switch 13.

[0050] The isolating circuit breaker 11 has one end connected to the wind farm collection and booster station 4 via a 66kV cable or overhead line, and the other end electrically connected to the high-voltage side of the 66kV local booster transformer 2. An electronic current transformer 12 is integrated on the isolating circuit breaker 11 and is connected to the protection and control device. Its coil and data collector are placed separately. The data collector's housing adopts an anti-electromagnetic interference structure and heat insulation and vibration reduction measures. Data transmission is carried out through a dedicated fiber optic insulator. It is used to detect short-circuit current, triggering the isolating circuit breaker 11 to trip (e.g., overcurrent protection), providing an electrical signal to the protection and control device, which then transmits this signal to the wind farm collection and booster station 4. It can also upload current data to the control cabinet, supporting status assessment and fault analysis.

[0051] The grounding switch 13 is integrated into the isolating circuit breaker 11, with one end connected to the isolating circuit breaker 11. It is used to reliably ground the circuit after the circuit breaker is tripped, ensuring the safety of personnel and equipment during maintenance or repair. Furthermore, the operating mechanism of the grounding switch 13 is equipped with an interlocking device associated with the isolating circuit breaker 11, thus eliminating the need for an additional independent grounding switch 13, simplifying the operating logic, and reducing the risk of misoperation.

[0052] This configuration combines the functions of a traditional circuit breaker and a disconnector into one by using an isolating circuit breaker, simultaneously meeting the dual requirements of isolating the disconnection point and breaking short-circuit current. It incorporates components such as a grounding switch 13 and a current transformer 31. Compared to the traditional AIS solution, the DCB equipment solution reduces the number of devices by 50% through the integration of three devices (circuit breaker + disconnector + grounding switch). The compact layout reduces the footprint by 35%-40%, and because it eliminates the independent disconnector and its secondary circuit, it is expected to reduce the total life cycle maintenance cost by about 40%.

[0053] Furthermore, the 66kV power distribution device 1 also includes a control cabinet, which is communicatively connected to the wind farm's collection and booster station 4 and can transmit signals via fiber optic communication; the control cabinet is equipped with an online monitoring device, an intelligent terminal, and a merging unit.

[0054] The online monitoring device is used to monitor the SF6 gas pressure, moisture content, mechanical operating characteristics, and coil current of the 66kV power distribution device 1 through sensors, realizing SF6 monitoring, mechanical characteristic monitoring, opening and closing coil current monitoring, and energy storage motor current monitoring. The intelligent terminal is used to perform intelligent control and status monitoring of the isolating circuit breaker 11; the merging unit is used to synchronize, merge, and resample the sampled values ​​output by the electronic current transformer 12.

[0055] It should be noted that SF6 monitoring refers to monitoring the state of SF6 gas, such as pressure, humidity, temperature, and decomposition products. SF6 gas is used for insulation and arc extinguishing; low pressure may lead to insufficient insulation, high humidity may cause equipment failure, and decomposition products may indicate internal discharge. Mechanical characteristic monitoring involves the mechanical operating parameters of the isolating circuit breaker 11, such as opening and closing time, speed, synchronicity, and contact travel. Abnormal time or speed may lead to excessive arcing time, damaging the equipment. Opening and closing coil current monitoring monitors the current waveform of the coil during operation. Abnormal coil current may reflect mechanical faults or electrical problems, such as jamming or core issues. Energy storage motor current monitoring is crucial, as the energy storage motor stores energy for the spring mechanism. Monitoring the current can determine the motor's operating status; excessive current may indicate increased mechanical load, while insufficient current may indicate motor failure.

[0056] Furthermore, the 66kV DCB equipment, the control cabinet, the live display 15, and the 66kV surge arrester 14 constitute the 66kV power distribution device 1. The 66kV surge arrester 14 can be an AC gapless metal oxide surge arrester.

[0057] One end of the 66kV surge arrester 14 is connected to the wind farm collection substation 4 via a 66kV cable or overhead line, and the other end of the 66kV surge arrester 14 is grounded. The 66kV surge arrester 14 is used to limit overvoltage when lightning overvoltage or operational overvoltage enters along the line, and to provide overvoltage protection for the 66kV power distribution device 1. The live indicator 15 is used to indicate whether the 66kV power distribution device 1 or the line is live, so as to avoid electric shock accidents when maintenance personnel conduct inspections or maintenance.

[0058] In this embodiment, the 66kV local step-up transformer 2 is installed on the foundation 6, which is located in an oil pit. The bottom of the oil pit is lower than the ground level. The installation of the 66kV local step-up transformer 2 on the foundation 6 prevents the oil leakage of the 66kV local step-up transformer 2 from spreading to the surrounding environment and the prefabricated cabin in the event of a failure, thereby avoiding fire accidents and damage to the prefabricated cabin.

[0059] In this embodiment, a fiber optic switch is also included. The fiber optic switch can be installed in the prefabricated cabin. The fiber optic switch is connected to the wind farm collection and boosting station 4 and is used to interact with the wind farm collection and boosting station 4 for data exchange. Through the fiber optic switch, the electrical information of the boosting substation is transmitted to the wind farm collection and boosting station 4 to realize remote monitoring and operation.

[0060] Specifically, during operation, the 66kV distribution unit 1 and the low-voltage distribution unit 3 collect their respective electrical signals characterizing their operating status and transmit these signals to the protection and control device. Upon receiving the electrical signals, the protection and control device can upload them to the back-end management terminal of the wind farm convergence substation 4 via a corresponding fiber optic switch, enabling remote monitoring of the 66kV distribution unit 1 and the low-voltage distribution unit 3 based on these signals. Conversely, if the wind farm convergence substation 4 generates a distribution control signal, it can send this signal to the protection and control device via a corresponding fiber optic switch. The protection and control device then transmits or executes the distribution control command. Through data transmission between the protection and control device and the wind farm convergence substation 4, remote monitoring of the local 66kV step-up substation for the wind turbine generator 5 is achieved, reducing monitoring costs.

[0061] The protection and control device is installed inside the prefabricated cabin and is connected to the fiber optic switch, 66kV power distribution unit 1, and low-voltage power distribution unit 3. As a protection, measurement, monitoring, and control device for 66kV power distribution unit 1 and its collector lines, the protection and control device can also be configured with three-stage overcurrent protection and two-stage zero-sequence protection for 66kV power distribution unit 1 and low-voltage power distribution unit 3 to ensure their safe and stable operation.

[0062] Optionally, the low-voltage power distribution unit 3 is connected to the wind turbine via low-voltage cables and communication optical cables. The integrated design of the low-voltage power distribution unit 3 allows it to be connected to the wind turbine via only low-voltage cables and communication optical cables after the prefabricated hull is hoisted to the installation destination, significantly shortening installation time and reducing installation costs.

[0063] In this embodiment, a microcomputer-based five-prevention system is also included. The microcomputer-based five-prevention system is installed in the prefabricated cabin and is connected to the prefabricated cabin and the low-voltage power distribution device 3. It prevents the corresponding electrical operations of the maintenance personnel when the cabin door is energized, or prohibits the maintenance personnel from misoperating when the electrical operations of the maintenance personnel do not meet the preset safety operation logic.

[0064] The prefabricated cabin also includes an uninterruptible power supply (PS) system, which is connected to a low-voltage power distribution device 3.

[0065] Specifically, after the uninterruptible AC power supply system 38 is connected to the low-voltage power distribution device 3, it can provide additional power protection and stability for the low-voltage power distribution device 3. That is, under normal power supply conditions, the uninterruptible AC power supply system 38 can obtain power from the low-voltage power distribution device 3. In the event of power failure or abnormality, the uninterruptible AC power supply system 38 can supply power to the low-voltage power distribution device 3, avoiding damage or data loss of the low-voltage power distribution device 3 due to sudden power failure.

[0066] Furthermore, the prefabricated cabin also includes an AC power distribution system and a DC power supply system, wherein:

[0067] Both the AC power distribution system and the DC power supply system are connected to the protection and control device and the 66kV power distribution device 1; they supply power to the 66kV power distribution device 1 to ensure its normal operation.

[0068] In this embodiment, the low-voltage power distribution device 3 includes: a current transformer 31, a low-voltage circuit breaker 32, a fuse 33, a surge protector 34, a low-voltage knife switch 35, a lighting maintenance transformer 36, and a lighting maintenance busbar 37.

[0069] Among them, one end of the current transformer 31 is connected to the low-voltage side of the 66kV local step-up transformer 2 and the protection and control device; one end of the low-voltage circuit breaker 32 is connected to the other end of the current transformer 31, and the other end of the low-voltage circuit breaker 32 is connected to the wind turbine converter cabinet; one end of the fuse 33 is connected to the other end of the current transformer 31; one end of the surge protector 34 is connected to the other end of the fuse 33, and the other end of the surge protector 34 is grounded; one end of the low-voltage knife switch 35 is connected to the other end of the current transformer 31; the lighting maintenance transformer 36 is connected to the other end of the low-voltage knife switch 35; and the lighting maintenance busbar 37 is connected to the lighting maintenance transformer 36 and the air switch respectively.

[0070] like Figure 2 As shown, the current transformer 31 is used to measure the electrical signal corresponding to the operating status of the low-voltage power distribution device 3 and transmit the electrical signal to the protection and control device, which then transmits the electrical signal to the wind farm collection and step-up substation 4; the low-voltage circuit breaker 32 is used to automatically disconnect the circuit between the low-voltage power distribution device 3 and the wind turbine converter cabinet when a short circuit, overload, or undervoltage fault occurs in the line, protecting the wind turbine converter cabinet and other equipment connected to the low-voltage power distribution device 3 from damage; the fuse 33 and surge protector 34 are used to protect the low-voltage power distribution device 3 from instantaneous overvoltages such as lightning and operational overvoltages; the low-voltage knife switch 35 is an electrical appliance with the dual functions of a switch and a fuse 33, protecting other components in the low-voltage power distribution device 3 from damage; the lighting maintenance transformer 36, the lighting maintenance busbar 37, and the air switch are used together to provide the low-voltage power supply required for maintenance or local lighting.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A DCB based on-site voltage boosting substation for a wind turbine generator system, characterized in that, include: A 66kV power distribution device (1) is installed outside the wind turbine generator set (5), and the 66kV power distribution device (1) is electrically connected to the wind farm collection and boosting station (4). A 66kV local step-up transformer (2) is provided, with its high-voltage side electrically connected to the 66kV power distribution device (1). The low-voltage power distribution device (3) is connected to the low-voltage side of the 66kV local step-up transformer (2), and the low-voltage power distribution device (3) is integrated into the prefabricated cabin. The low-voltage power distribution device (3) is communicatively connected to the wind farm collection step-up station (4), and the low-voltage power distribution device (3) is connected to the wind turbine generator set (5). The 66kV power distribution device (1) includes: The isolating circuit breaker (11) has one end connected to the wind farm collection and boosting station (4) via a 66kV cable or overhead line, and the other end is electrically connected to the high-voltage side of the 66kV local boosting transformer (2). An electronic current transformer (12) is integrated on the isolating circuit breaker (11), and the electronic current transformer (12) is connected to the protection and control device. A grounding switch (13) is provided, one end of which is connected to the isolating circuit breaker (11).

2. The DCB based plant wind turbine power plant station of claim 1, wherein, Also includes: The control cabinet is communicatively connected to the wind farm's collection and booster station (4), and the control cabinet is equipped with: An online monitoring device is used to monitor the SF6 gas pressure, moisture content, mechanical action characteristics and coil current of the 66kV power distribution device (1) through sensors; The intelligent terminal is used to perform intelligent control and status monitoring of the isolating circuit breaker (11); The merging unit is used to synchronize, merge and resample the sampled values ​​output by the electronic current transformer (12).

3. The DCB based on-site wind turbine step-up substation of claim 1, wherein, Also includes: A 66kV surge arrester (14) is provided. One end of the 66kV surge arrester (14) is connected to the wind farm collection and booster station (4) via a 66kV cable or overhead line, and the other end of the 66kV surge arrester (14) is grounded.

4. The DCB based equipment wind turbine power booster station according to any of claims 1-3, characterized in that, The 66kV local step-up transformer (2) is installed on the foundation (6), which is located in the oil pit.

5. The DCB based equipment wind turbine on-shore booster substation according to any of claims 1-3, characterized in that, It also includes a microcomputer-based five-prevention system, which is installed in the prefabricated cabin and connected to the prefabricated cabin and the low-voltage power distribution device (3).

6. The DCB based plant wind turbine power booster station of claim 1, wherein, The low-voltage power distribution device (3) is connected to the fan via a low-voltage cable and a communication optical cable.

7. The DCB based plant wind turbine power booster station as claimed in claim 3, wherein, The 66kV surge arrester (14) is an AC gapless metal oxide surge arrester.

8. The DCB based plant wind turbine power booster station of claim 1, wherein, The low-voltage power distribution device (3) includes: Current transformer (31), one end of which is connected to the low-voltage side of the 66kV local step-up transformer (2) and the protection and control device; Low-voltage circuit breaker (32), one end of which is connected to the other end of the current transformer (31), and the other end of which is connected to the fan converter cabinet; A fuse (33), one end of which is connected to the other end of the current transformer (31); A surge protector (34), one end of which is connected to the other end of the fuse (33), and the other end of which is grounded; A low-voltage knife-type fusible switch (35) is provided, one end of which is connected to the other end of the current transformer (31). A lighting maintenance transformer (36) is connected to the other end of the low-voltage knife switch (35); The lighting maintenance bus (37) is connected to the lighting maintenance transformer (36) and the air switch respectively.

9. The DCB based plant wind turbine power booster station as claimed in claim 1, wherein, The prefabricated cabin also includes: An uninterruptible AC power supply system (38) is connected to the low-voltage power distribution device (3).

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