A modular intelligent narrow-body frequency converter system

Abstract

This utility model discloses a modular intelligent narrow-body frequency converter cabinet system, comprising: a narrow-body cabinet with internal module installation space, air inlet, and air outlet; a modular backplane system integrating a main circuit busbar and a control / auxiliary power bus; at least one standard functional module with standardized mechanical and electrical interfaces, pluggably installed in the cabinet and connected to the backplane system for implementing specific power conversion or control functions; and an intelligent thermal management system including a temperature sensor, an adjustable-speed fan, and a fan controller, capable of adjusting the fan speed according to temperature information to control airflow within the cabinet. This utility model, through modular design and intelligent thermal management, achieves high system integration, excellent maintainability, flexible configuration capabilities, and efficient heat dissipation, making it suitable for high-power frequency converter applications in industrial drives, new energy, and other fields.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter cabinet technology, specifically to a modular intelligent narrow-body frequency converter cabinet system. Background Technology

[0002] With the increasing demand for industrial automation and energy conservation and emission reduction, high-power frequency converters have been widely used in motor drives, new energy grid connection, power transmission and other fields. Traditional high-power frequency converter systems are large in size and have high heat dissipation requirements due to their main body and necessary supporting components (such as input circuit breakers, contactors, input / output reactors, EMC filters, control transformers, etc.). They are usually installed in multiple standard power cabinets, and the components are mostly connected by cables.

[0003] This traditional installation method has many problems: First, it occupies a lot of installation space, increasing the construction cost of the power distribution room and the purchase cost of the cabinets; second, the on-site cable laying and connection work is arduous, the installation and commissioning cycle is long, the labor cost is high, and the connection reliability is greatly affected by the installation process; third, when a component in the system fails, due to the low integration and complex connection, troubleshooting and component replacement are often time-consuming and labor-intensive, resulting in a long mean time to repair (MTTR) and seriously affecting production continuity; in addition, traditional cabinet heat dissipation mostly adopts a rough overall ventilation, which makes it difficult to carry out refined and on-demand thermal management based on the characteristics of different heat-generating components, which may lead to local overheating that affects the life of components, or excessive cooling that causes energy waste and noise pollution; finally, the fixed internal layout makes the system less adaptable to different power level requirements or specific application scenarios, making it difficult to make flexible configuration adjustments and rapid technical upgrades.

[0004] To address some of the aforementioned issues, the industry has developed several compact inverter integrated cabinet solutions. These solutions involve designing the inverter itself with a narrow body and integrating some accessories into the same cabinet, optimizing internal connections through copper busbars and other methods. However, even with these improved solutions, there is still room for improvement in overall system maintainability, configuration flexibility, the intelligence of thermal management, and rapid deployment and upgrade capabilities. For example, while achieving higher integration, internal components remain highly concentrated, and replacing a single core component may still involve disassembling multiple related components, resulting in insufficient convenience. Furthermore, the internal layout is often a "fixed" design for specific power ranges and configurations, limiting its adaptability to changes in requirements or technological upgrades.

[0005] Therefore, providing a solution that can further improve the integration, maintainability, flexibility and intelligence of high-power frequency converter systems has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] Purpose of the invention: The purpose of this utility model is to overcome the shortcomings of the prior art and provide a modular intelligent narrow-body frequency converter cabinet system. This system aims to significantly improve the maintainability, configuration flexibility, installation efficiency and operational reliability of the system through standardized functional modules, pluggable connection methods and intelligent thermal management, while optimizing space utilization and reducing the total life cycle cost.

[0007] Technical Solution: To achieve the above objectives, the technical solution adopted by this utility model is: a modular intelligent narrow-body frequency converter cabinet system, comprising: a narrow-body cabinet having a structure that defines the internal module installation space, an air inlet for introducing external air, and an air outlet for discharging internal air; a modular backplane system disposed within the internal module installation space of the narrow-body cabinet, the modular backplane system being provided with: a busbar arranged along a predetermined power transmission path for sequentially transmitting main circuit power between the connected power supply and the output load; and a bus for bidirectional transmission of control signals and distribution of auxiliary power between each connection point; at least one standard functional module, the standard functional module having: a standardized mechanical interface that mates with the internal structure of the narrow-body cabinet for enabling pluggable positioning and installation of the standard functional module within the internal module installation space. The system includes: a standardized electrical interface corresponding to the busbar and the bus of the modular backplane system, for connecting the internal circuitry of the standard functional module to the power transmission path and the bus when the standard functional module is inserted; the standard functional module is used to implement specific power conversion or control functions of the frequency converter cabinet system; and an intelligent thermal management system, including at least one temperature sensor for sensing the temperature inside the narrow cabinet or the standard functional module, at least one adjustable speed fan for forming a forced airflow between the air inlet and the air outlet, and a fan controller; the fan controller is signal-connected to the temperature sensor and control-connected to the adjustable speed fan, and the fan controller is configured to adjust the speed of the adjustable speed fan according to the temperature signal received from the temperature sensor to control the airflow through the internal module installation space.

[0008] Furthermore, the standardized mechanical interface includes a guide structure for slidingly engaging with a guide rail on the inner wall of the narrow-body cabinet and a locking mechanism for fixing the standard functional module in the installation position.

[0009] Furthermore, the standardized electrical interface includes: a heavy-duty power connector that plugs into the busbar, having pins defined according to a predetermined power flow direction; and a multi-core signal connector that plugs into the busbar.

[0010] Furthermore, the standard functional module includes: an input and protection module, connected in series at the input end of the power transmission path, for receiving external power and providing overcurrent protection; a rectifier module, whose input end is electrically connected to the output end of the input and protection module, for converting the input AC power into DC power; a DC support module, connected to the output end of the rectifier module, for stabilizing the DC power; an inverter module, whose input end is electrically connected to the output end of the DC support module, for inverting the DC power into AC power with adjustable frequency and amplitude and outputting it; and a control and communication module, which is signal-connected to the rectifier module and the inverter module through the bus, for controlling their operating status and communicating through an external interface.

[0011] Furthermore, the rectifier module is an active front-end rectifier module, whose internal circuit structure is capable of realizing the forward energy flow from the AC input terminal to the DC output terminal and the reverse energy flow from the DC input terminal to the AC output terminal.

[0012] Furthermore, the internal circuit of the inverter module is configured to support multiple identical inverter modules connected in parallel to the output terminal of the DC support module, thereby increasing the total power output to the load.

[0013] Furthermore, the fan controller is configured to receive temperature signals from the control and communication module or directly from the temperature sensors installed in different locations within the multiple standard functional modules, and, in conjunction with the load status signal obtained from the control and communication module, dynamically calculate and output control signals to adjust the speed of the adjustable fan using a proportional-integral-derivative control algorithm or a fuzzy logic control algorithm.

[0014] Furthermore, the modular backplane system is designed to be compatible with and support any combination of standard functional modules of different types and / or different power levels, but all having the standardized mechanical interface and the standardized electrical interface, so as to achieve flexible configuration or reconfiguration of system functions.

[0015] Furthermore, the power conversion circuit of the rectifier module and / or the inverter module is constructed based on silicon carbide (SiC) or gallium nitride (GaN) semiconductor devices.

[0016] Furthermore, the overall width of the narrow-body cabinet is designed to be less than or equal to 450mm.

[0017] Beneficial effects: Compared with the prior art, the advantages of this utility model are: (1) Significantly improved maintainability and availability: The standardized functional modules adopt a pluggable design, and faulty modules can be quickly located and replaced independently, greatly shortening the average repair time and reducing downtime losses. (2) High configuration flexibility and scalability: Users can flexibly select and combine different types and power levels of standard functional modules according to actual needs, easily realizing the customization of system functions, power expansion or future technology upgrades. (3) Optimized intelligent thermal management and energy saving and noise reduction: The intelligent thermal management system accurately controls the fan speed according to real-time temperature and load conditions, ensuring that each module works in the optimal temperature range, improving the life of components and system reliability, while effectively reducing heat dissipation energy consumption and operating noise. (4) Simplified installation and rapid deployment: The modular design and standardized interface simplify the production, testing and on-site installation process, and the prefabricated modules can greatly shorten the on-site deployment time. (5) Reduced total life cycle cost: By improving maintainability, flexibility, energy efficiency and deployment efficiency, the initial investment, operation and maintenance costs of the equipment and indirect losses caused by downtime are comprehensively reduced. (6) Compact spatial layout: The narrow cabinet design effectively reduces the system footprint and improves space utilization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the modular intelligent narrow-body frequency converter cabinet system provided by this utility model.

[0019] Figure 2 This is a schematic diagram of the modular backplane system structure in this utility model.

[0020] Figure 3 This is a schematic diagram of the standard functional module (taking the inverter module as an example) in this utility model.

[0021] Figure 4 This is a schematic diagram showing the connection relationship of the main functional modules of this utility model in the power flow path. Detailed Implementation

[0022] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0023] Example 1: This utility model provides a modular intelligent narrow-body frequency converter cabinet system. The system includes a narrow-body cabinet 100, a modular backplane system 200, at least one standard functional module 300, and an intelligent thermal management system 400.

[0024] like Figure 1As shown, the narrow-body cabinet 100 employs a metal enclosure structure, for example, with a width of 400mm, a depth of 600mm, and a height of 2000mm, internally defining an internal module mounting space 101 for accommodating and installing standard functional modules 300. The lower part of the cabinet 100 is provided with an air inlet 102 for introducing external cooling air, which may be equipped with a dust filter. The upper part of the cabinet 100 is provided with an air outlet 103 for expelling internal hot air. Guide rails are provided on the inner wall of the internal module mounting space 101 for mates with the standardized mechanical interface 310 of the standard functional modules 300.

[0025] like Figure 2 As shown, the modular backplane system 200 is typically installed at the rear or middle of the narrow-body cabinet 100, facing the internal module installation space 101.

[0026] The backplane system 200 integrates: Busbar 210: Arranged along a predetermined power transmission path, for example, a multilayer busbar structure made of highly conductive copper. Busbar 210 is used to sequentially connect the various standard functional modules 300 involved in the main circuit power conversion and transmission from the external power input point to the final load output point, forming a complete main power flow channel. For example, it may include a three-phase AC input busbar, DC positive and negative busbars, and a three-phase AC output busbar. Bus 220: Used for bidirectional transmission of control signals, status signals, and communication data between the various standard functional modules 300 or between the modules and an external control system, and to allocate the required auxiliary DC power to the control circuits of each module. Bus 220 can be implemented using a multilayer PCB structure, integrating auxiliary power rails such as CAN bus, RS485 bus, Ethernet bus, and 24VDC and 15VDC.

[0027] Connectors corresponding to the standardized electrical interface 320 of the standard functional module 300 are provided at predetermined positions on the busbar 210 and the bus 220.

[0028] like Figure 3 Taking the inverter module as an example, the standard functional module 300 encapsulates specific functional units (such as rectification, inversion, filtering, control, etc.) in the frequency converter cabinet system into independent physical entities with unified or serialized interfaces.

[0029] Each standard functional module 300 has:

[0030] Standardized mechanical interface 310: includes guide structures on the module housing (e.g., grooves or convex rails, mate with guide rails 104 within the cabinet 100) and locking mechanisms (e.g., lever-type, screw-type, or quick-lock type, for securely fixing the module in the installation position and ensuring reliable electrical connections). This interface ensures that standard functional modules 300 of different types or batches can be easily and accurately installed into any compatible slot in the cabinet 100.

[0031] Standardized electrical interfaces 320 include heavy-duty power connectors 321 (e.g., crown spring connectors, blade connectors, with pin definitions and arrangements standardized according to a predetermined power flow) that connect to the busbar 210 of the backplane system 200, and multi-core signal connectors 322 (e.g., high-density board-to-board connectors, D-Sub connectors, etc.) that connect to the busbar 220 of the backplane system 200. When the standard functional module 300 is inserted into the rack 100 and mates with the backplane system 200, these connectors automatically establish reliable electrical connections between the module's internal circuitry and the backplane busbar 210 and busbar 220.

[0032] like Figure 4 As shown, the standard functional module 300 in this utility model may include, but is not limited to:

[0033] Input and Protection Module 300a: Connected in series at the input end of the power transmission path, it typically integrates a main circuit circuit breaker, AC contactor, fast-acting fuse, etc., to receive external power grid and provide overcurrent, short-circuit, and other protections.

[0034] EMC filter module: used to suppress electromagnetic interference at the input or output.

[0035] Rectifier module 300b: Its input terminal is electrically connected to the output terminal of input and protection module 300a (or the output terminal of EMC filter module) via backplane busbar 210. Its internal circuitry is used to convert the input AC power (e.g., three-phase 380VAC) into DC power. In a preferred embodiment, rectifier module 300b may employ active front-end (AFE) rectification technology, and its internal circuitry (e.g., a three-phase bridge circuit based on IGBT or SiCMOSFET and corresponding control) enables forward energy flow from AC input terminal to DC output terminal, and reverse energy flow from DC input terminal to AC output terminal under specific conditions (e.g., regenerative braking of motor) (energy feedback to the grid).

[0036] DC support module 300c: It is connected to the DC output terminal of rectifier module 300b via backplane bus 210. It typically contains a large-capacity DC filter capacitor bank, pre-charge circuit, voltage equalization resistor, etc., to stabilize the DC bus voltage, absorb ripple, and provide energy buffer for the inverter module.

[0037] Inverter module 300d: Its input terminal is electrically connected to the output terminal (i.e., DC bus) of DC support module 300c via backplane busbar 210. Its internal circuitry inverts the DC power on the DC bus into three-phase AC power with adjustable frequency and amplitude, and outputs it to the load (e.g., a motor). In a preferred embodiment, the internal circuitry and control strategy of inverter module 300d support multiple identical inverter modules 300d connected in parallel to the DC bus, and all supply power to the output terminal via backplane busbar 210, thereby flexibly expanding the total output power of the system. During parallel operation, the control and communication module 300e typically coordinates the current sharing among the parallel modules.

[0038] Output processing module: Connected between the output of inverter module 300d and the final load, it may include an output reactor, dv / dt filter or sine wave filter to improve the output waveform and protect the motor insulation.

[0039] Control and Communication Module 300e: This module typically does not directly participate in the main power flow, but it connects to the control interface signals of various power modules (such as rectifier module 300b, inverter module 300d, etc.) via the backplane bus 220. Internally, it integrates a main controller (such as a DSP, FPGA, or high-performance MCU), a human-machine interface (HMI), various industrial fieldbus interfaces (such as Profibus, Profinet, EtherCAT, Modbus, etc.), and digital / analog I / O interfaces. This module is responsible for executing the core control algorithms of the frequency converter system (such as motor control algorithms, PWM generation, system protection logic, inter-module coordination, etc.), processing user input, displaying system status, and communicating data with the host monitoring system or external devices.

[0040] Auxiliary power supply module: Used to convert AC power from the main circuit high voltage (such as DC bus) or externally introduced separately to obtain the stable low-voltage DC power (such as 24VDC, 15VDC, 5VDC, etc.) required by the control circuits, drive circuits, sensors, fans, etc. of each standard functional module 300, and distribute it through the backplane bus 220.

[0041] In a preferred embodiment, the power conversion circuits of the rectifier module 300b and / or the inverter module 300d are constructed using wide-bandgap semiconductor devices, such as silicon carbide (SiC) MOSFETs or gallium nitride (GaN) HEMTs. Compared to traditional silicon-based IGBTs, these devices offer advantages such as faster switching speeds, lower on-resistance, and better temperature resistance, which helps to improve the power density and efficiency of the modules while reducing heat dissipation requirements.

[0042] The intelligent thermal management system 400 is used to maintain the operating temperature within the narrow-body cabinet 100, especially for the standard functional modules 300 that generate significant heat (such as rectifier module 300b and inverter module 300d), within a safe and optimal range. This system includes:

[0043] Temperature sensors: at least one, and typically multiple, are distributed and installed in critical locations within the narrow-body cabinet 100 or directly integrated within the standard functional module 300 (e.g., close to the power device heatsink). Used for real-time sensing and monitoring of temperature.

[0044] Adjustable speed fan 420: at least one, typically installed at the air outlet 103 (or air inlet 102, or forming a push-pull airflow) of the rack 100, to create a forced cooling airflow between the air inlet 102 and the air outlet 103, accelerating the removal of internal heat. The speed of fan 420 can be adjusted via PWM signal or other means.

[0045] The fan controller 430 can be a standalone control unit or an integrated function within the control and communication module 300e or auxiliary power module. The fan controller 430 connects to various temperature sensors (either directly or by acquiring temperature data from other modules via the backplane bus 220) and controls the speed control interface of the adjustable fan 420. Internally, the fan controller 430 runs preset control logic or algorithms. Based on real-time temperature signals received from the temperature sensors (temperatures at one or more points), and optionally combined with system load status signals acquired from the control and communication module 300e (higher load typically indicates higher heat generation), it dynamically calculates and outputs control signals to adjust the speed of the adjustable fan 420. For example, a proportional-integral-derivative (PID) control algorithm or a rule-based fuzzy logic control algorithm can be used to achieve smooth and precise adjustment of the fan speed, thereby optimizing heat dissipation, reducing energy consumption, and minimizing noise.

[0046] In one specific embodiment, the overall width of the narrow-body cabinet 100 can be designed to be less than or equal to 450mm, for example, 400mm, which greatly saves installation space compared to traditional solutions.

[0047] Furthermore, to further improve system availability and maintenance efficiency, at least some key standard functional modules 300 (such as redundantly configured inverter modules, fan modules, etc.) can be designed to support hot-swapping or warm-swapping operations under system power-on or low-load conditions. This requires special design in the module's electrical interface 320 and control logic, such as using long and short pins to control the timing of power and signal insertion and removal, and corresponding software handshaking mechanisms.

[0048] It is worth mentioning that the modular backplane system 200 of this utility model has a highly compatible structural design, capable of supporting the installation of standard functional modules 300 of different types (such as rectifier modules, inverter modules, filter modules, etc.) and / or different power levels (such as 50kW inverter modules, 100kW inverter modules, as long as their interfaces conform to the standardized definition). Users can arbitrarily combine and install the required standard functional modules 300 within the rack 100 according to actual application needs, like building blocks, thereby achieving flexible configuration of system functions or future upgrades and reconstructions.

[0049] Brief description of the working process: When the system starts up, the external power supply is connected through the input and protection module 300a, flowing sequentially through the EMC filter (if applicable), rectifier module 300b, and DC support module 300c, converting it into stable DC power. The control and communication module 300e, according to user settings or external commands, controls the inverter module 300d to invert the DC power into AC power with the required parameters, which is then processed (if applicable) to drive the load. During this process, the intelligent thermal management system 400 continuously monitors the internal temperature and dynamically adjusts the fan speed 420 to maintain the system operating at a suitable temperature. If a standard functional module 300 malfunctions, maintenance personnel can quickly remove it from the cabinet and insert a working module of the same type to rapidly restore system operation.

[0050] This invention, through the aforementioned structural design, brings significant technological advancements and beneficial effects: excellent maintainability and availability. The core lies in the pluggable design of the standard functional module 300. When a functional unit malfunctions, the system can quickly locate the specific faulty module. Maintenance personnel do not need complex disassembly and wiring operations; they simply need to remove the faulty module from its internal module mounting space 101 within the narrow-body cabinet 100 and insert a spare, functional standard functional module 300 of the same type. Due to the automatic docking of the standardized electrical interface 320 with the modular backplane system 200, the module replacement process is extremely fast, significantly reducing the mean time to repair (MTTR) from hours or even days in traditional solutions to within tens of minutes. This greatly reduces production downtime caused by equipment failure and improves the overall system availability. When combined with a hot-swappable / warm-swappable design, partial module replacement can be completed without completely interrupting system operation, further enhancing continuous operation capability.

[0051] High configuration flexibility and scalability: The modular backplane system 200's compatibility with standard functional modules 300 with standardized interfaces provides the system with great configuration flexibility. Users can select the appropriate type and quantity of standard functional modules 300 for combination and installation based on initial application requirements (such as power level, whether energy feedback is required, specific communication protocols, etc.). In the future, if requirements change, such as needing to increase output power, this can be achieved by adding inverter modules 300d in parallel; if new functions need to be added, such as upgrading from non-feedback rectification to AFE feedback rectification, only the corresponding rectifier module 300b needs to be replaced (and possibly the control software updated). This "building block" construction method allows the system to easily adapt to various application scenarios and facilitates technical upgrades and functional expansion, effectively extending the economic life of the equipment.

[0052] Optimized intelligent thermal management and energy saving / noise reduction: The intelligent thermal management system 400 monitors data from multiple temperature sensors 410 in real time and optionally combines this data with system load information to achieve refined management of the internal temperature field. The fan controller 430 dynamically adjusts the speed of the adjustable fan 420 according to a preset intelligent control strategy (such as PID or fuzzy logic). This means that when the system is lightly loaded or the ambient temperature is low, the fan can run at low speed or even intermittently, significantly reducing the cooling system's own energy consumption (saving 5-20% or more energy compared to a constant-speed fan) and operating noise. Conversely, when the system is heavily loaded or the ambient temperature is high, the fan can promptly increase its speed to ensure sufficient heat dissipation, prevent overheating of power devices, and thus improve component lifespan and overall system reliability. This on-demand cooling method is far superior to traditional, inefficient constant-speed ventilation.

[0053] Simplified installation and rapid deployment: Standardized functional modules 300 can be pre-assembled, debugged, and tested at the factory. Upon arrival at the user's site, installation is primarily simplified to inserting each module into its designated slot in the narrow-body cabinet 100 and locking it in place. External wiring is also significantly reduced due to high integration. This greatly shortens the on-site installation and commissioning cycle (deployment time can be reduced by more than 50% compared to traditional multi-cabinet, large-scale cable connections), lowers the skill requirements for on-site installers, and improves the consistency of installation quality.

[0054] Reducing Total Lifetime Cost (TCO): While modular design may initially increase costs due to connectors, precision mechanical structures, etc., the benefits over the entire equipment lifecycle are significant. Reduced downtime directly decreases production losses; simplified maintenance operations lower labor costs; easy upgrades prevent premature equipment obsolescence due to changing demands; and improved energy efficiency (especially reduced heat dissipation energy consumption) saves on operating electricity costs. Considering these factors, this invention effectively reduces the user's total lifecycle cost.

[0055] Compact layout and higher power density: The narrow-body cabinet 100 design (e.g., width ≤ 450mm) significantly reduces the system's footprint. Combined with an internal modular and highly integrated layout, along with optional advanced power semiconductor devices (such as SiC / GaN) and efficient heat dissipation design, the entire system can achieve higher power output within a smaller volume, thus increasing power density. This is particularly important for applications with limited installation space.

[0056] In summary, the modular intelligent narrow-body frequency converter cabinet system of this utility model effectively solves many problems existing in the prior art through its unique structural design and functional implementation, and provides a more advanced, efficient, reliable and economical solution for high-power frequency converter applications.

[0057] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A modular intelligent compact variable frequency cabinet system, characterized in that, include: The narrow-body cabinet (100) has a structure that limits the internal module installation space (101), an air inlet (102) for introducing external air and an air outlet (103) for discharging internal air. A modular backplane system (200) is provided in the internal module installation space (101) of the narrow-body cabinet (100); the modular backplane system (200) is provided with: a busbar (210) arranged along a predetermined power transmission path for sequentially transmitting main circuit power between the connected power supply and the output load, and a bus (220) for bidirectional transmission of control signals and distribution of auxiliary power between each connection point. At least one standard functional module (300); the standard functional module (300) has: a standardized mechanical interface (310) that mates with the internal structure of the narrow-body cabinet (100) for pluggable positioning installation of the standard functional module (300) within the internal module installation space (101); and a standardized electrical interface (320) corresponding to the busbar (210) and the bus (220) of the modular backplane system (200), for connecting its internal circuitry to the power transmission path and the bus (220) when the standard functional module (300) is inserted; the standard functional module (300) is used to implement specific power conversion or control functions of the frequency converter cabinet system; and The intelligent thermal management system (400) includes at least one temperature sensor for sensing the temperature inside the narrow cabinet (100) or the standard functional module (300), at least one adjustable speed fan (420) for forming a forced airflow between the air inlet (102) and the air outlet (103), and a fan controller (430); the fan controller (430) is signal-connected to the temperature sensor and control-connected to the adjustable speed fan (420), and the fan controller (430) is configured to adjust the speed of the adjustable speed fan (420) according to the temperature signal received from the temperature sensor in order to control the airflow through the internal module installation space (101).

2. The modular intelligent narrow rackless converter cabinet system of claim 1, wherein, The standardized mechanical interface (310) includes a guide structure for slidingly engaging with a guide rail on the inner wall of the narrow-body cabinet (100) and a locking mechanism for fixing the standard functional module (300) in the installation position.

3. The modular intelligent narrowbay transormer cabinet system of claim 1, wherein, The standardized electrical interface (320) includes: a heavy-duty power connector (321) that plugs into the busbar (210) and has pins defined according to a predetermined power flow direction; and a multi-core signal connector (322) that plugs into the bus (220).

4. The modular intelligent narrow bay variable frequency cabinet system of any one of claims 1 to 3, wherein, The standard functional module (300) includes: An input and protection module (300a) is connected in series at the input end of the power transmission path to receive external power and provide overcurrent protection; A rectifier module (300b) has its input terminal electrically connected to the output terminal of the input and protection module (300a) for converting the input AC power into DC power; A DC support module (300c) is connected to the output terminal of the rectifier module (300b) and is used to stabilize the DC power. An inverter module (300d), whose input terminal is electrically connected to the output terminal of the DC support module (300c), is used to invert the DC power into AC power with adjustable frequency and amplitude and output it; and The control and communication module (300e) is connected to the rectifier module (300b) and the inverter module (300d) via the bus (220) and is used to control their operating status and communicate with external interfaces.

5. The modular intelligent narrow-body frequency converter system according to claim 4, characterized in that, The rectifier module (300b) is an active front-end rectifier module, and its internal circuit is configured to enable forward energy flow from the AC input terminal to the DC output terminal and reverse energy flow from the DC input terminal to the AC output terminal.

6. The modular intelligent narrow-body frequency converter system according to claim 5, characterized in that, The internal circuit of the inverter module (300d) is configured to support multiple identical inverter modules (300d) connected in parallel to the output terminal of the DC support module (300c) to increase the total power output to the load.

7. The modular intelligent narrow-body frequency converter system according to claim 1, characterized in that, The fan controller (430) is configured to receive temperature signals from the control and communication module (300e) or directly from the temperature sensors installed in different locations within the multiple standard functional modules (300), and, in conjunction with the load status signal obtained from the control and communication module (300e), dynamically calculate and output control signals to adjust the speed of the adjustable fan (420) using a proportional-integral-derivative control algorithm or a fuzzy logic control algorithm.

8. The modular intelligent narrow-body frequency converter system according to claim 1, characterized in that, The modular backplane system (200) is designed to be compatible with and support any combination of the standard functional modules (300) of different types and / or different power levels, but all having the standardized mechanical interface (310) and the standardized electrical interface (320), so as to achieve flexible configuration or reconfiguration of system functions.

9. The modular intelligent narrow-body frequency converter system according to claim 4, characterized in that, The power conversion circuits of the rectifier module (300b) and / or the inverter module (300d) are constructed using silicon carbide (SiC) or gallium nitride (GaN) semiconductor devices.

10. The modular intelligent narrow-body frequency converter system according to claim 1, characterized in that, The overall width of the narrow cabinet (100) is designed to be less than or equal to 450mm.

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