Digital intelligent circuit breaker power module layout optimization system

Abstract

The invention relates to the technical field of power module layout optimization, and discloses a digital intelligent circuit breaker power module layout optimization system, which comprises a data acquisition module used for acquiring complete machine basic parameters, environmental data, air duct structure parameters, busbar structure parameters and busbar electrical parameters, and determining the number of power modules and the rated current of a circuit breaker; the heat dissipation model construction module is used for constructing a composite heat dissipation model, calculating airflow resistance of the pre-cooling section, the heat exchange section and the mixing section, and summarizing the airflow resistance as total pressure loss of the system; calculating the total mass flow rate; the power module arrangement design module is used for constructing a power module layout scheme; the scheme design module is used for constructing a busbar connection scheme; and the checking and compensating module is used for carrying out quantitative checking on the temperature rise and the current loss so as to carry out compensation by adopting a first preset optimization strategy. According to the invention, structural symmetry of power module arrangement, segmented optimization of a heat dissipation path and conduction balance of electrical connection are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of power module layout optimization, and particularly relates to a system for optimizing the layout of a power module of a digital intelligent circuit breaker. Background Art

[0002] At present, circuit breaker systems are widely used in scenarios such as fast charging of new energy vehicles, intelligent power distribution, and high-power conversion. In the prior art, power modules are usually arranged in a planar or stacked form, lacking coordinated consideration of the relationship between module heat generation, air duct design, and current path, resulting in low structural utilization rate, long heat dissipation paths, and local temperature increase, which easily form heat accumulation areas. At the same time, traditional heat dissipation methods mainly rely on forced air supply by fans, and do not fully utilize the structural space to achieve natural suction-assisted heat dissipation, with low energy efficiency. In terms of electrical connection, the busbar and the circuit breaker are mostly independently designed in a linear arrangement, without considering the power module distribution and the balance of the current-carrying path, which easily leads to problems such as unequal lengths of the conductive paths, uneven resistance, and inconsistent current shunting, affecting the electrical safety and thermal stability of the system. Summary of the Invention

[0003] The present invention provides a system for optimizing the layout of a power module of a digital intelligent circuit breaker, which solves the technical problems of poor system reliability and low thermal management efficiency caused by the lack of unified optimization of the power module arrangement, insufficient heat dissipation performance, and uneven electrical connection paths in the related art.

[0004] The present invention provides a system for optimizing the layout of a power module of a digital intelligent circuit breaker, including: A data acquisition module, configured to acquire the basic parameters of the whole machine, environmental data, air duct structure parameters, busbar structure parameters, and busbar electrical parameters, and determine the number of power modules and the rated current of the required circuit breaker according to the basic parameters of the whole machine; A heat dissipation model construction module, configured to construct a composite heat dissipation model according to the environmental data, air duct structure parameters, number of power modules, and rated current of the circuit breaker, where the composite heat dissipation model includes: Dividing the air duct structure into a pre-cooling section, a heat exchange section, and a mixing section; Collecting the air flow velocities of the three sections of the air duct, respectively calculating the air flow resistances of the three sections of the air duct, and summarizing them as the total pressure loss of the system; Calculating the total mass flow based on the environmental data and air duct structure parameters; A power module layout design module, configured to construct a power module layout scheme based on non-equidistant distribution with a golden angle according to the number of power modules and the basic parameters of the whole machine; A scheme design module, configured to determine the arrangement position of the circuit breaker by combining the sample-driven method with the K-nearest neighbor algorithm according to the rated current of the circuit breaker and the busbar structure parameters, and construct a busbar connection scheme; A checking and compensation module is used to quantitatively check the temperature rise of the power module and the current loss of the busbar based on the composite heat dissipation model, the power module layout scheme, and the busbar connection scheme, and when any check exceeds the corresponding preset threshold, a first preset optimization strategy is adopted for optimization.

[0005] Furthermore, the overall machine basic parameters include: the overall machine rated power, the single-module power, the output voltage, the module size, the module mass, and the module heat generation; The module size includes: the module length, the module width, and the module height; The environmental data includes: the environmental temperature, the air density, and the air specific heat capacity; The air duct structure parameters include: the total height of the air duct and the effective cross-sectional area of the air duct; The busbar structure parameters include: the busbar thickness, the busbar material, and the number of busbar layers; The busbar electrical parameters include: the busbar current and the busbar resistance.

[0006] Furthermore, the number of power modules is determined by taking the ratio of the overall machine rated power to the single-module power and rounding up; The rated current of the required circuit breaker is determined by taking the ratio of the overall machine rated power to the output voltage.

[0007] Furthermore, the heat exchange section corresponds to the height interval where the power module is located, the pre-cooling section is located below the heat exchange section, and the mixing section is located above the heat exchange section.

[0008] Furthermore, the air flow resistance of the three sections of the air duct is calculated respectively through the corresponding resistance coefficient, air density, and air flow velocity of each section of the air duct. Specifically: the air flow resistance of each section of the air duct is calculated by integrating the resistance coefficient, air density, and the square of the air flow velocity of this section; and the total pressure loss of the system is obtained by summing up the air flow resistances of the three sections of the air duct.

[0009] Furthermore, the fan flow rate is calculated by respectively obtaining the effective cross-sectional area of the mixing section air duct and the air flow velocity of this section; and the natural draft flow rate is calculated through the thermal pressure difference model based on the effective cross-sectional area of the air duct, the total height of the air duct, and the environmental temperature, and then the fan flow rate and the natural draft flow rate are added together to obtain the total mass flow rate.

[0010] Furthermore, the power module layout scheme includes: Determining the arrangement angle of each power module in a golden angle recurrence manner; Adopting an internal and external double-radius staggered layout; Calculating the centroid position of the power module and limiting the centroid offset within the first preset threshold, where the centroid offset represents the straight-line distance between the centroid and the center of the air duct; Calculate the torque during the plugging and unplugging process of the power module, and limit the torque not to exceed the second preset threshold.

[0011] Further, the busbar connection scheme includes: determining the busbar width based on a preset current density threshold and busbar structure parameters, and determining the installation position of the circuit breaker by using the K-nearest neighbor algorithm based on a preset historical power module layout sample library; Among them, the busbar width is obtained by dividing the rated current of the circuit breaker by the product of the current density threshold and the busbar thickness.

[0012] Further, the temperature rise of the power module is calculated by dividing the heat generation of the power module by the product of the total mass flow rate and the specific heat capacity of air; The current loss is obtained by multiplying the square of the busbar current by the busbar resistance.

[0013] Further, the first preset optimization strategy includes: increasing the cross-sectional area of the air duct, increasing the flow rate of the fan, and adjusting the busbar width.

[0014] The beneficial effects of the present invention are as follows: The present invention proposes a radial power module layout optimization system based on a central air duct structure, which has the advantages of collaborative design of heat, electricity, and structure. By dividing the air duct into a pre-cooling section, a heat exchange section, and a mixing section, a composite heat dissipation model is established by combining natural suction and forced convection of the fan, improving the heat dissipation efficiency and reducing the risk of local overheating; adopting a non-uniform module arrangement method based on the recursive golden angle to improve the layout symmetry and air flow stability; the busbar connection scheme and the module arrangement are integrated design to ensure equal length of the conduction path and balanced current-carrying capacity; the system introduces a multi-physical field quantitative verification and compensation mechanism to realize parameter-level optimization and adjustment, enhancing the design robustness and adaptability. The overall solution can effectively improve the thermal safety, current distribution balance, and engineering maintainability of the circuit breaker in high power density scenarios, and has good engineering practical value and expansibility. Description of the Drawings

[0015] Figure 1 It is a module schematic diagram of a digital intelligent circuit breaker power module layout optimization system of the present invention. Detailed Embodiments

[0016] Now, the subject matter described herein will be discussed with reference to the embodiments of the examples. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein, and the functions and arrangements of the elements discussed can be changed without departing from the protection scope of the content of this specification. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0017] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in one or more embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0018] As Figure 1 shown, an optimization system for the layout of a digital intelligent circuit breaker power module includes: A data acquisition module 101, configured to acquire the overall machine basic parameters, environmental data, air duct structure parameters, busbar structure parameters, and busbar electrical parameters, and determine the number of power modules and the rated current of the required circuit breaker according to the overall machine basic parameters; A heat dissipation model construction module 102, configured to construct a composite heat dissipation model according to the environmental data, air duct structure parameters, number of power modules, and rated current of the circuit breaker. Among them, the composite heat dissipation model includes: Dividing the air duct structure into a pre-cooling section, a heat exchange section, and a mixing section; Collecting the air flow velocities of the three sections of the air duct, respectively calculating the air flow resistances of the three sections of the air duct, and summarizing them as the total pressure loss of the system; Calculating the total mass flow rate based on the environmental data and air duct structure parameters; A power module layout design module 103, configured to construct a power module layout scheme based on non-uniform distribution with the golden angle according to the number of power modules and the overall machine basic parameters; A scheme design module 104, configured to determine the arrangement position of the circuit breaker by combining the sample-driven method with the K-nearest neighbor algorithm according to the rated current of the circuit breaker and the busbar structure parameters, and construct a busbar connection scheme; A checking and compensation module 105, configured to quantitatively check the temperature rise of the power module and the current loss of the busbar based on the composite heat dissipation model, the power module layout scheme, and the busbar connection scheme, and when any check exceeds the corresponding preset threshold, adopt a first preset optimization strategy for optimization.

[0019] In one embodiment of the present invention, the overall machine basic parameters include: the overall machine rated power, single-module power, output voltage, module size, module mass, and module heat generation; The module dimensions include: module length, module width, and module height; The environmental data includes: environmental temperature, air density, and specific heat capacity of air; The air duct structure parameters include: total height of the air duct and effective cross-sectional area of the air duct; The busbar structure parameters include: busbar thickness, busbar material, and number of busbar layers; The busbar electrical parameters include: busbar current and busbar resistance.

[0020] Among them, the rated power of the whole machine is obtained from the project requirements document, with the unit of W. The power of a single module is obtained through the test of the module prototype, with the unit of W. The output voltage is a preset fixed value, with the unit of V. The heat generation of the module is estimated by a thermal power simulation tool, with the unit of W. The units of module length, module width, and module height are m, and the unit of environmental temperature is °C; To ensure that input parameters with different sources and physical dimensions can be numerically calculated and processed in subsequent models and verifications, the basic parameters of the whole machine, environmental data, and air duct structure parameters are normalized. The normalization adopts the maximum-minimum normalization method, mapping each item of original data from the maximum and minimum values in its dimension to the interval of 0 to 1 to eliminate the influence of dimension differences on the calculation accuracy and convergence of the model.

[0021] In an embodiment of the present invention, the number of power modules is determined by rounding up the ratio of the rated power of the whole machine to the power of a single module, ensuring that the total output capacity is not lower than the requirements of the whole machine; The rated current of the required circuit breaker is determined by the ratio of the rated power of the whole machine to the output voltage. This rated current is used to select a circuit breaker device that meets the safety protection requirements and is used for subsequent calculation of the busbar width.

[0022] In an embodiment of the present invention, the heat dissipation model construction module divides the air duct structure into three sections in the following way: The air duct is divided into a pre-cooling section, a heat exchange section, and a mixing section along the height direction. The heat exchange section corresponds to the height interval where the power modules are located. The pre-cooling section is located below the heat exchange section, and the mixing section is located above the heat exchange section; The pre-cooling section is located in the air duct inlet area and is rectified by setting an air inlet flow guiding member to guide external cold air in and provide low-temperature cold air; The heat exchange section is located in the area where the power modules are located. The channel structure of this section matches the arrangement of the power modules and is used to handle the heat dissipated by the power modules and conduct heat exchange; The mixing section is located in the air duct outlet area. By setting a wind guiding device, the air flow is evenly mixed before the outlet to avoid directly discharging high-temperature air flow and maximize heat conduction.

[0023] By dividing the air duct, the airflow stability can be improved, local overheating can be reduced, heat concentration can be effectively avoided, temperature balance can be maintained, and the operating safety of the equipment can be enhanced.

[0024] In one embodiment of the present invention, the airflow resistances of the three sections of the air duct are obtained by integrating the corresponding resistance coefficients, air density, and airflow velocities of each section. The formula for the airflow resistance is: ; where, represents the airflow resistance of the i-th section of the air duct, i represents the index of the three sections of the air duct, represents the resistance coefficient of the i-th section of the air duct, represents the air density, represents the airflow velocity of the i-th section of the air duct.

[0025] By adding the airflow resistances of the three sections of the air duct, the total pressure loss of the system is obtained.

[0026] In one embodiment of the present invention, the total mass flow rate in the air duct consists of two parts, namely the fan flow formed by the fan drive and the natural draft flow formed by the thermal pressure difference. The two mechanisms act together on the air duct system to construct a composite cooling airflow.

[0027] Among them, the fan flow is calculated by the effective cross-sectional area of the mixing section of the air duct and the airflow velocity in the mixing section, and is used to actively regulate the flow rate to compensate for the flow gap when the natural draft is insufficient. The formula for the fan flow is: ; where, represents the fan flow, represents the effective cross-sectional area of the air duct, represents the airflow velocity in the mixing section of the air duct; The natural draft flow is calculated based on the effective cross-sectional area of the air duct, the total height of the air duct, and the ambient temperature through a thermal pressure difference model, and is used to form a passive cooling path without a fan, which can reduce energy consumption and improve the structural energy efficiency ratio. Among them, the formula for the natural draft flow is: ; where, represents the natural draft flow, represents the flow coefficient, H represents the total height of the air duct, represents the temperature difference inside and outside the air duct, represents the ambient temperature, and g represents the acceleration due to gravity; The total mass flow rate is expressed as the sum of the fan flow and the natural draft flow: , where, represents the total mass flow rate, which is used for subsequent temperature rise verification.

[0028] In one embodiment of the present invention, the non-equidistant arrangement of the golden angles means that the power modules are arranged by recursively incrementing at an angle of 137.5°, so that the positions of the power modules are distributed in a spiral shape, avoiding periodic resonance phenomena.

[0029] The power module layout scheme includes: Determine the arrangement angle of each power module in a recursive manner with the golden angle. Specifically, the formula for the arrangement angle of the power module is: ; where, represents the arrangement angle of the k-th power module, represents the arrangement angle of the (k - 1)-th power module, mod represents the remainder operation, that is, divide by , and take the obtained remainder as the value of , ensuring that the arrangement angle is always between and ; Adopt an inner and outer double-radius staggered arrangement. Specifically, arrange the power modules in the inner circle and the outer circle respectively, and arrange them in a staggered manner, that is, the angles of the power modules in the inner circle and the outer circle are staggered by a certain angle, so that the air flow can flow freely in the air duct, avoiding the heat island effect; Calculate the centroid position of the power module, and limit the centroid offset within the first preset threshold. Among them, the centroid offset represents the straight-line distance between the centroid and the center of the air duct; Specifically, the centroid position is represented by two-dimensional coordinates, and the formula for the centroid position is: ; ; where, and respectively represent the abscissa and ordinate of the centroid, represents the module mass of the k-th power module, and respectively represent the abscissa and ordinate of the k-th power module relative to the center of the air duct; Calculate the torque during the plugging and unplugging process of the power module, and limit the torque not to exceed the second preset threshold.

[0030] Among them, the purpose of adopting the golden angle arrangement is to break the periodic structural resonance and form a spiral uniform distribution; the inner and outer double-radius hierarchical structure helps to increase the heat transfer area and air flow disturbance; by limiting the centroid offset, it is ensured that the power module layout does not generate too large a center of gravity deviation, thereby avoiding uneven stress or instability during the operation of the present invention; by limiting the torque, the convenience of maintenance operations is guaranteed.

[0031] In one embodiment of the present invention, the busbar is a conductive structure used to distribute current in an electrical system and is used to connect different circuit breakers or power modules; the busbar connection scheme is to design and layout the busbar so that the busbar can effectively connect different circuit breakers or power modules and can carry the corresponding current; The busbar structure parameters include: busbar thickness, busbar material, and number of busbar layers; the busbar thickness is a preset value, and the number of busbar layers means that within the allowable space range, the positive busbar and the negative busbar are respectively arranged on different layers and are isolated by an insulating structure to form a multi-layer stacked conductive structure, which is used to improve the system's current-carrying capacity and electromagnetic performance.

[0032] The busbar connection scheme includes: determining the busbar width based on a preset current density threshold and busbar structure parameters, and determining the installation position of the circuit breaker by using the K-nearest neighbor algorithm based on a preset historical power module layout sample library; Among them, in the present invention, by fixing the busbar thickness and inversely calculating the required busbar width according to the preset current density threshold to meet the current-carrying capacity at the maximum working current, the formula for the busbar width is: ; Among them, represents the busbar width, represents the rated current of the circuit breaker, represents the preset current density threshold, represents the busbar thickness.

[0033] The historical power module layout sample library refers to a set of power module layout data sets generated through actual measurement or simulation. Each sample includes the centroid position of the power module, the length of the conductive path between the power module and the circuit breaker, and the corresponding circuit breaker layout position; Using the K-nearest neighbor algorithm to determine the installation position of the circuit breaker, the specific steps include: Calculating the Euclidean distance between power modules, presetting candidate installation points for the circuit breaker, and calculating the length of the conductive path from the power module to the candidate installation point to form a first feature vector; Calling the preset historical power module layout sample library, and using the K-nearest neighbor algorithm to match the first feature vector with the samples in the historical power module layout sample library with the Euclidean distance as the measurement method, and screening out the K most similar samples; Based on the layout experience of the circuit breaker in the selected samples, using the majority principle to determine the recommended installation position of the circuit breaker in the current system to achieve the shortest connection path from each power module to the circuit breaker.

[0034] In one embodiment of the present invention, the formula for the temperature rise is: ; Among them, It represents the temperature rise, i.e., the increase in the temperature of the power module, and Q represents the heat generation of the power module. It represents the specific heat capacity of air. It represents the total mass flow rate; the temperature rise represents the balance state between the heat generation of the power module and the heat dissipation capacity during the operation of the power module. By comparing with a preset temperature rise threshold, it is used to judge whether the composite heat dissipation model meets the working requirements; if the temperature rise exceeds the preset temperature rise threshold, the first preset optimization strategy will be triggered by the verification and compensation module for adjustment. The formula for the current loss is: ; Wherein, It represents the current loss, i.e., the heat generated when the current flows through the busbar. I represents the current passing through the busbar, and R represents the resistance of the busbar; the current loss is affected by the busbar material, resistance path, and conductive width, and is used to judge whether it is necessary to adjust the width, thickness, or number of layers of the busbar during the busbar design; the current loss can be compared with a preset current loss threshold to judge whether the conductive capacity of the busbar under rated working conditions meets the system design requirements; if the copper loss exceeds this threshold, the first preset optimization strategy will be triggered by the verification and compensation module to adjust the busbar cross-section parameters or material selection to reduce the unit resistance power consumption.

[0035] In an embodiment of the present invention, the first preset optimization strategy includes: increasing the air duct cross-sectional area, increasing the fan flow rate, and adjusting the busbar width.

[0036] In an embodiment of the present invention, the total system pressure loss output by the composite heat dissipation model is used to judge whether the current fan configuration meets the heat dissipation requirements. Calculate the target mass flow rate according to the heat generation of the power module and the allowable temperature rise value, and combine the fan head-flow characteristics to judge the actual available air flow rate. When the actual mass flow rate is less than the target mass flow rate, it is judged that the air flow is insufficient, which may cause the module temperature rise to exceed the design threshold. At this time, the verification and compensation module will trigger the first preset optimization strategy, and preferentially execute fan parameter adjustment, such as increasing the fan speed or replacing the high-head fan. If necessary, further optimize the air duct structure to increase the channel cross-sectional area to restore the heat exchange capacity of the system. If the verification result shows that the current loss exceeds the threshold, adjusting the busbar width is one of the first preset optimization strategies to reduce the resistance heat loss and meet the system thermal stability design requirements.

[0037] It should be noted that the setting of the interval and the threshold value is for the convenience of comparison. Among them, the size of the threshold value depends on the amount of sample data and the base quantity set by those skilled in the art for each group of sample data, as long as it does not affect the proportional relationship between the parameters and the quantified values. And the above formulas are all calculations that remove the dimension and take their numerical values. The formulas are all obtained by collecting a large amount of data for software simulation to get a formula closest to the actual situation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0038] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. An intelligent circuit breaker power module layout optimization system, characterized in that Including: A data acquisition module, which is used to acquire the basic parameters of the whole machine, environmental data, air duct structure parameters, busbar structure parameters and busbar electrical parameters, and determine the number of power modules and the rated current of the required circuit breakers according to the basic parameters of the whole machine; A heat dissipation model construction module, which is used to construct a composite heat dissipation model according to the environmental data, air duct structure parameters, number of power modules and the rated current of the circuit breaker. The composite heat dissipation model includes: Dividing the air duct structure into a pre-cooling section, a heat exchange section and a mixing section; Collecting the air flow velocities of the three sections of the air duct, respectively calculating the air flow resistances of the three sections of the air duct, and summarizing them into the total system pressure loss; Calculating the total mass flow based on the environmental data and the air duct structure parameters; A power module layout design module, which is used to construct a power module layout scheme based on non-equidistant distribution with the golden angle according to the number of power modules and the basic parameters of the whole machine; A scheme design module, which is used to determine the installation position of the circuit breaker by means of sample driving combined with the K-nearest neighbor algorithm according to the rated current of the circuit breaker and the busbar structure parameters, and construct a busbar connection scheme; A checking and compensation module, which is used to quantitatively check the temperature rise of the power module and the current loss of the busbar based on the composite heat dissipation model, the power module layout scheme and the busbar connection scheme, and when any check exceeds the corresponding preset threshold, adopt the first preset optimization strategy for optimization.

2. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 1, characterized in that, The basic parameters of the whole machine include: the rated power of the whole machine, the power of a single module, the output voltage, the module size, the module mass and the module heat generation; The module size includes: the module length, the module width and the module height; The environmental data includes: the environmental temperature, the air density and the specific heat capacity of the air; The air duct structure parameters include: the total height of the air duct and the effective cross-sectional area of the air duct; The busbar structure parameters include: the busbar thickness, the busbar material and the number of busbar layers; The busbar electrical parameters include: the busbar current and the busbar resistance.

3. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 2, wherein, Determining the number of power modules by taking the ratio of the rated power of the whole machine to the power of a single module and rounding up; Determining the rated current of the required circuit breaker by taking the ratio of the rated power of the whole machine to the output voltage.

4. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 1, characterized in that, The heat exchange section corresponds to the height range where the power module is located. The pre-cooling section is located below the heat exchange section, and the mixing section is located above the heat exchange section.

5. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 2, characterized in that, The air flow resistances of the three sections of the air duct are respectively calculated by the corresponding resistance coefficients, air density and the air flow velocities of each section of the air duct. Specifically: by fusing the resistance coefficient, air density and the square of the air flow velocity of each section of the air duct, the air flow resistance of this section of the air duct is calculated; and by summarizing the air flow resistances of the three sections of the air duct, the total system pressure loss is obtained.

6. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 5, characterized in that Calculating the fan flow by respectively obtaining the effective cross-sectional area of the mixing section of the air duct and the air flow velocity of this section; and calculating the natural draft flow by the thermal pressure difference model based on the effective cross-sectional area of the air duct, the total height of the air duct and the environmental temperature, and then adding the fan flow and the natural draft flow to obtain the total mass flow.

7. The optimized system for the layout of a digital intelligent circuit breaker power module according to claim 1, wherein The power module layout scheme includes: Determining the layout angle of each power module in a recursive manner with the golden angle; Adopting an inner and outer double radius staggered layout; Calculating the centroid position of the power module and limiting the centroid offset within the first preset threshold, where the centroid offset represents the straight-line distance between the centroid and the center of the air duct; Calculate the torque during the plugging and unplugging process of the power module, and limit the torque not to exceed the second preset threshold.

8. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 2, characterized in that The busbar connection scheme includes: determining the busbar width based on a preset current density threshold and busbar structure parameters, and determining the installation position of the circuit breaker by using the K-nearest neighbor algorithm based on a preset historical power module layout sample library; Among them, the busbar width is obtained by dividing the rated current of the circuit breaker by the product of the current density threshold and the busbar thickness.

9. The layout optimization system for the power module of a digital intelligent circuit breaker according to claim 6, characterized in that, The temperature rise of the power module is calculated by dividing the heat generation of the power module by the product of the total mass flow rate and the specific heat capacity of air; The current loss is obtained by multiplying the square of the busbar current by the busbar resistance.

10. The optimized system for the layout of the power module of a digital intelligent circuit breaker according to claim 1, characterized in that, The first preset optimization strategy includes: increasing the cross-sectional area of the air duct, increasing the flow rate of the fan, and adjusting the busbar width.

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