A digital circuit breaker power module layout optimization system

Abstract

The present invention relates to the technical field of power module layout optimization, and discloses a digital circuit breaker power module layout optimization system, comprising: a data acquisition module for acquiring basic parameters of the entire machine, 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 the circuit breaker; a heat dissipation model construction module for constructing a composite heat dissipation model, calculating the airflow resistance of the pre-cooling section, heat exchange section, and mixing section, and summarizing it as the total pressure loss of the system; calculating the total mass flow; a power module layout design module for constructing a power module layout scheme; a scheme design module for constructing a busbar connection scheme; a verification and compensation module for quantitatively verifying temperature rise and current loss, and then adopting a first preset optimization strategy for compensation. The present invention achieves structural symmetry of the power module arrangement, segmented optimization of the heat dissipation path, and balanced conduction of the electrical connection.

Description

Technical Field

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

[0002] At present, circuit breaker systems are widely used in new energy vehicle fast charging, intelligent power distribution and high-power conversion scenarios. In the existing technology, power modules are usually arranged in a flat or stacked form, and there is a lack of coordinated consideration of the relationship between module heat generation, air duct design and current path, resulting in low structural utilization, long heat dissipation paths, local temperature rise, and easy formation of heat accumulation areas. At the same time, traditional heat dissipation methods mainly rely on fans to force air supply, and do not fully utilize the structural space to achieve natural suction-assisted heat dissipation, resulting in low energy efficiency. In terms of electrical connection, busbars and circuit breakers are mostly designed independently in a linear arrangement, without considering the distribution of power modules and the balance of current-carrying paths. Problems such as unequal length of conductive paths, uneven resistance, and inconsistent current diversion are prone to occur, affecting the electrical safety and thermal stability of the system. Summary of the Invention

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

[0004] The present invention provides a digital circuit breaker power module layout optimization system, comprising:

[0005] The data acquisition module is used to obtain 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 based on the basic parameters of the whole machine;

[0006] The heat dissipation model building module is used to build a composite heat dissipation model based on environmental data, air duct structure parameters, the number of power modules, and the rated current of the circuit breaker. The composite heat dissipation model includes:

[0007] The air duct structure is divided into pre-cooling section, heat exchange section and mixing section;

[0008] Collect the airflow velocity of the three sections of the air duct, calculate the airflow resistance of the three sections of the air duct respectively, and summarize them into the total pressure loss of the system;

[0009] Calculate the total mass flow rate based on environmental data and duct structure parameters;

[0010] The power module layout design module is used to build a power module layout solution based on the golden angle non-equidistant distribution according to the number of power modules and the basic parameters of the whole machine;

[0011] The scheme design module is used to determine the layout of the circuit breaker and build a busbar connection scheme based on the rated current of the circuit breaker and the busbar structure parameters through a sample-driven method combined with the K-nearest neighbor algorithm;

[0012] The verification and compensation module is used to quantitatively verify 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 plan and the busbar connection plan, and adopt the first preset optimization strategy for optimization when any verification exceeds the corresponding preset threshold.

[0013] Furthermore, 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 quality and the module heat generation;

[0014] The module dimensions include: module length, module width and module height;

[0015] Environmental data include: ambient temperature, air density and air specific heat capacity;

[0016] The air duct structural parameters include: total air duct height and effective air duct cross-sectional area;

[0017] Busbar structural parameters include: busbar thickness, busbar material and number of busbar layers;

[0018] Busbar electrical parameters include: busbar current and busbar resistance.

[0019] Furthermore, the number of power modules is determined by rounding up the ratio of the rated power of the entire machine to the power of a single module.

[0020] 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.

[0021] 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.

[0022] Furthermore, the airflow resistance of the three sections of the air duct is calculated by the corresponding resistance coefficient, air density and airflow velocity of each section of the air duct. Specifically, the airflow resistance of each section of the air duct is calculated by integrating the resistance coefficient, air density and the square of the airflow velocity of the section; and the total pressure loss of the system is obtained by summing up the airflow resistance of the three sections of the air duct.

[0023] 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 based on the effective cross-sectional area of the air duct, the total height of the air duct and the ambient temperature, the natural draft flow rate is calculated by the thermal pressure difference model, and then the fan flow rate and the natural draft flow rate are added together to obtain the total mass flow rate.

[0024] Furthermore, the power module layout solution includes:

[0025] Determine the arrangement angle of each power module using the golden angle recursive method;

[0026] Adopt inner and outer double radius staggered arrangement;

[0027] Calculating the center of mass position of the power module and limiting the center of mass offset to be within a first preset threshold, wherein the center of mass offset represents the straight-line distance between the center of mass and the center of the air duct;

[0028] The torque during the power module plugging and unplugging process is calculated, and the torque is limited to not exceed a second preset threshold.

[0029] Furthermore, the busbar connection scheme includes: determining the busbar width based on a preset current density threshold and busbar structural parameters, and determining the installation position of the circuit breaker using a K-nearest neighbor algorithm based on a preset historical power module arrangement sample library;

[0030] 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.

[0031] Furthermore, the temperature rise of the power module is calculated by dividing the heat generated by the power module by the product of the total mass flow and the specific heat capacity of the air;

[0032] The current loss is obtained by multiplying the square of the busbar current by the busbar resistance.

[0033] Furthermore, the first preset optimization strategy includes: increasing the cross-sectional area of the air duct, increasing the fan flow rate, and adjusting the busbar width.

[0034] The beneficial effects of the present invention are as follows: the present invention proposes a radial power module layout optimization system based on the structural center air duct, which has the advantages of thermal, electrical and structural collaborative design. 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 fan forced convection to improve heat dissipation efficiency and reduce the risk of local overheating; a non-equidistant module arrangement method based on golden angle recursion is adopted to improve the layout symmetry and airflow stability; the busbar connection scheme and module arrangement are integrated into the design to ensure that the conductive paths are of equal length and the current carrying capacity is balanced; the system introduces a multi-physical field quantitative verification and compensation mechanism to achieve parameter-level optimization and adjustment, and enhance 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 scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a module schematic diagram of a digital circuit breaker power module layout optimization system of the present invention. DETAILED DESCRIPTION

[0036] The subject matter described herein will now be discussed with reference to the embodiments of the present invention. It should be understood that the discussion of these embodiments is intended solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0037] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of the present invention should have the usual meanings understood by people 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. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] like Figure 1 As shown, a digital circuit breaker power module layout optimization system includes:

[0039] Data acquisition module 101 is used to obtain 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 based on the basic parameters of the whole machine;

[0040] The heat dissipation model building module 102 is used to build a composite heat dissipation model based on environmental data, air duct structural parameters, the number of power modules, and the rated current of the circuit breaker, wherein the composite heat dissipation model includes:

[0041] The air duct structure is divided into pre-cooling section, heat exchange section and mixing section;

[0042] Collect the airflow velocity of the three sections of the air duct, calculate the airflow resistance of the three sections of the air duct respectively, and summarize them into the total pressure loss of the system;

[0043] Calculate the total mass flow rate based on environmental data and duct structure parameters;

[0044] The power module arrangement design module 103 is used to construct a power module layout solution based on the golden angle non-equidistant distribution according to the number of power modules and the basic parameters of the whole machine;

[0045] A scheme design module 104 is used to determine the layout position of the circuit breaker and construct a busbar connection scheme based on the rated current of the circuit breaker and the busbar structure parameters by using a sample-driven method combined with a K-nearest neighbor algorithm;

[0046] The verification and compensation module 105 is used to quantitatively verify 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 plan and the busbar connection plan, and adopt the first preset optimization strategy for optimization when any verification exceeds the corresponding preset threshold.

[0047] In one embodiment of the present invention, 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;

[0048] The module dimensions include: module length, module width and module height;

[0049] Environmental data include: ambient temperature, air density and air specific heat capacity;

[0050] The air duct structural parameters include: total air duct height and effective air duct cross-sectional area;

[0051] Busbar structural parameters include: busbar thickness, busbar material and number of busbar layers;

[0052] Busbar electrical parameters include: busbar current and busbar resistance.

[0053] The rated power of the entire machine is obtained from the project requirements document and is measured in W. The power of a single module is obtained through module prototype testing and is measured in W. The output voltage is a preset fixed value and is measured in V. The heat generated by the module is estimated using a thermal power simulation tool and is measured in W. The module length, module width, and module height are measured in meters, and the ambient temperature is measured in degrees Celsius.

[0054] To ensure that input parameters from different sources and physical dimensions can be numerically calculated and processed in subsequent modeling and verification, the basic parameters of the entire system, environmental data, and air duct structure parameters are normalized. This normalization uses a maximum-minimum normalization method, mapping each raw data item to the range of 0 to 1 based on the maximum and minimum values of its dimension, thereby eliminating the impact of dimensional differences on model calculation accuracy and convergence.

[0055] In one embodiment of the present invention, the number of power modules is determined by rounding up the ratio of the rated power of the entire machine to the power of a single module to ensure that the total output capacity is not less than the total machine requirement.

[0056] The rated current of the required circuit breaker is determined by the ratio of the rated power of the entire machine to the output voltage. This rated current is used to select circuit breaker devices that meet safety protection requirements and is used for subsequent calculations of the busbar width.

[0057] In one embodiment of the present invention, the heat dissipation model building module divides the air duct structure into three sections in the following manner:

[0058] 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 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.

[0059] The pre-cooling section is located at the air duct inlet area, and is provided with an air inlet guide to rectify the air flow, guide the external cold air to enter, and provide low-temperature cold air;

[0060] The heat exchange section is located in the area where the power module is located. The channel structure of this section matches the arrangement of the power module and is used to process the heat emitted by the power module and perform heat exchange;

[0061] The mixing section is located in the air duct outlet area. By setting an air guide device, the air flow is evenly mixed before the outlet, avoiding direct discharge of high-temperature air flow and maximizing heat conduction.

[0062] By dividing the air ducts, the airflow stability can be improved, local overheating can be reduced, heat concentration can be effectively avoided, temperature balance can be maintained, and the safety of equipment operation can be improved.

[0063] In one embodiment of the present invention, the airflow resistance of the three sections of the air duct is obtained by integrating the resistance coefficient corresponding to each section, the air density, and the airflow velocity of each section of the air duct. The formula for the airflow resistance is:

[0064] ;

[0065] in, Indicates the airflow resistance of the i-th air duct, i represents the index of the three-section air duct, represents the resistance coefficient of the i-th section of the air duct, represents the air density, Indicates the air flow velocity of the i-th section of the air duct.

[0066] The total pressure loss of the system is obtained by adding the air flow resistance of the three sections of air duct.

[0067] In one embodiment of the present invention, the total mass flow rate within the air duct is composed of two components: the fan flow generated by the fan drive and the natural draft flow generated by the thermal pressure difference. These two mechanisms work together in the air duct system to form a composite heat dissipation airflow.

[0068] The fan flow rate is calculated by the effective cross-sectional area of the mixing section air duct and the air flow velocity in the mixing section. It is used to actively control the flow rate and compensate for the flow gap when the natural draft is insufficient. The formula for the fan flow rate is:

[0069] ;

[0070] in, Indicates the fan flow rate, Indicates the effective cross-sectional area of the air duct, Indicates the air flow velocity in the mixing section duct;

[0071] The natural draft flow rate is calculated based on the effective cross-sectional area of the duct, the total height of the duct, and the ambient temperature through a thermal pressure difference model. It is used to form a passive cooling path without a fan, which can reduce energy consumption and improve the structural energy efficiency ratio. The formula for the natural draft flow rate is:

[0072] ;

[0073] in, Indicates the natural draft flow, represents the flow coefficient, H represents the total height of the duct, Indicates the temperature difference between inside and outside of the duct. represents the ambient temperature, g represents the acceleration due to gravity;

[0074] The total mass flow is expressed as the sum of the fan flow and the natural draft flow: ,in, Indicates the total mass flow rate, which is used for subsequent temperature rise verification.

[0075] In one embodiment of the present invention, the golden angle non-equidistant arrangement refers to recursively arranging the power modules with an angle increment of 137.5°, so that the positions of the power modules are distributed in a spiral shape to avoid periodic resonance.

[0076] The power module layout solution includes:

[0077] The arrangement angle of each power module is determined by golden angle recursion. Specifically, the formula for the arrangement angle of the power module is:

[0078] ;

[0079] in, represents the arrangement angle of the kth power module, Indicates the arrangement angle of the k-1th power module, mod indicates the remainder operation, that is, Divide by , take the remainder as value, ensuring that the arrangement angle is always arrive between;

[0080] Adopting an inner and outer double-radius staggered arrangement, specifically, the power modules are arranged in the inner and outer rings respectively, and arranged in a staggered manner, that is, the angles of the inner and outer ring power modules are staggered by a certain angle, so that the airflow can flow freely in the air duct and avoid the heat island effect;

[0081] Calculating the center of mass position of the power module and limiting the center of mass offset to be within a first preset threshold, wherein the center of mass offset represents the straight-line distance between the center of mass and the center of the air duct;

[0082] Specifically, the center of mass position is represented by two-dimensional coordinates, and the formula for the center of mass position is:

[0083] ;

[0084] ;

[0085] in, and denote the horizontal and vertical coordinates of the center of mass, respectively. represents the module quality of the kth power module, and They represent the abscissa and ordinate of the kth power module relative to the center of the air duct;

[0086] The torque during the power module plugging and unplugging process is calculated, and the torque is limited to not exceed a second preset threshold.

[0087] 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 improve the heat exchange area and airflow disturbance; by limiting the center of mass offset, it ensures that the power module layout does not produce excessive center of gravity deviation, thereby avoiding uneven force or instability during operation of the present invention; by limiting the torque, the convenience of maintenance operations is guaranteed.

[0088] 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 solution is designed and laid out so that the busbar can effectively connect different circuit breakers or power modules and carry the corresponding current.

[0089] The busbar structure parameters include: busbar thickness, busbar material and number of busbar layers; the busbar thickness is the design preset value, and the number of busbar layers refers to the arrangement of the positive busbar and the negative busbar at different layers within the permitted space, and the isolation through the insulation structure to form a multi-layered conductive structure, which is used to improve the system's current carrying capacity and electromagnetic performance.

[0090] The busbar connection scheme includes: determining the busbar width based on a preset current density threshold and busbar structural parameters, and determining the installation position of the circuit breaker using a K-nearest neighbor algorithm based on a preset historical power module layout sample library;

[0091] The present invention fixes the busbar thickness and reversely calculates the required busbar width based on a preset current density threshold to meet the current carrying capacity at the maximum operating current. The formula for the busbar width is:

[0092] ;

[0093] in, Indicates the busbar width, Indicates the rated current of the circuit breaker. Indicates the preset current density threshold, Indicates the busbar thickness.

[0094] 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 including the center of mass 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;

[0095] The K-nearest neighbor algorithm is used to determine the installation location of the circuit breaker. The specific steps include:

[0096] Calculating the Euclidean distance between power modules, presetting candidate installation points for circuit breakers, and calculating the length of the conductive path from the power module to the candidate installation point to form a first eigenvector;

[0097] Calling a preset historical power module layout sample library, using the K-nearest neighbor algorithm to match the first eigenvector with samples in the historical power module layout sample library using Euclidean distance as a metric, and screening out the most similar K samples;

[0098] Based on the layout experience of circuit breakers in the selected samples, the majority principle is used 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.

[0099] In one embodiment of the present invention, the temperature rise formula is:

[0100] ;

[0101] in, Indicates temperature rise, that is, the increase in the temperature of the power module, Q indicates the heat generated by the power module, is the specific heat capacity of air, represents the total mass flow rate; the temperature rise represents the balance between the heat generated by the module and the heat dissipation capacity during the operation of the power module, and is compared with the preset temperature rise threshold to determine 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 to make adjustments;

[0102] The formula for the current loss is:

[0103] ;

[0104] in, represents current loss, i.e., the heat generated when current flows through the busbar. I represents the current passing through the busbar, and R represents the busbar resistance. The current loss is affected by the busbar material, resistance path, and conductive width, and is used to determine whether the busbar width, thickness, or number of layers needs to be adjusted during busbar design. The current loss can be compared with a preset current loss threshold to determine whether the busbar's conductivity under rated operating conditions meets the system design requirements. If the copper loss exceeds this threshold, the verification and compensation module triggers the first preset optimization strategy to adjust the busbar cross-sectional parameters or material selection to reduce the power consumption per unit resistance.

[0105] In one embodiment of the present invention, 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.

[0106] In one embodiment of the present invention, the total system pressure loss output by the composite heat dissipation model is used to determine whether the current fan configuration meets the heat dissipation requirements. The target mass flow rate is calculated based on the module heat generation and the allowable temperature rise value of the power module, and the actual air flow rate that can be provided is determined in combination with the fan pressure head-flow characteristics. When the actual mass flow rate is less than the target mass flow rate, it is judged that the airflow 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 give priority to the fan parameter adjustment, such as increasing the fan speed or replacing the high-pressure head fan. If necessary, further implement the air duct structure optimization to increase the channel cross-sectional area and restore the system heat exchange capacity. If the verification result is that the current loss exceeds the threshold, the busbar width is adjusted as one of the first preset optimization strategies to reduce the resistance heat loss and meet the system thermal stability design requirements.

[0107] It should be noted that the intervals and thresholds are set for ease of comparison. The threshold size depends on the amount of sample data and the cardinality set by those skilled in the art for each set of sample data, as long as it does not affect the proportional relationship between the parameter and the quantized value. Furthermore, the above formulas are all dimensionless numerical calculations. These formulas are derived from software simulations of the most recent real-world conditions using large amounts of data. The preset parameters in these formulas are set by those skilled in the art based on actual conditions.

[0108] The above describes the embodiments of the present invention, but the present invention is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. A digital circuit breaker power module layout optimization system, characterized in that: include: The data acquisition module is used to obtain 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 based on the basic parameters of the whole machine; The heat dissipation model building module is used to build a composite heat dissipation model based on environmental data, air duct structure parameters, the number of power modules, and the rated current of the circuit breaker. The composite heat dissipation model includes: The air duct structure is divided into pre-cooling section, heat exchange section and mixing section; Collect the airflow velocity of the three sections of the air duct, calculate the airflow resistance of the three sections of the air duct respectively, and summarize them into the total pressure loss of the system; Calculate the total mass flow rate based on environmental data and duct structure parameters; The power module layout design module is used to build a power module layout solution based on the golden angle non-equidistant distribution according to the number of power modules and the basic parameters of the whole machine; The scheme design module is used to determine the layout of the circuit breaker and build a busbar connection scheme based on the rated current of the circuit breaker and the busbar structure parameters through a sample-driven method combined with the K-nearest neighbor algorithm; A verification and compensation module is used to quantitatively verify 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 plan, and the busbar connection plan. If any of the verifications exceeds the corresponding preset threshold, a first preset optimization strategy is adopted for optimization; The power module layout solution includes: Determine the arrangement angle of each power module using the golden angle recursive method; Adopt inner and outer double radius staggered arrangement; Calculating the center of mass position of the power module and limiting the center of mass offset to be within a first preset threshold, wherein the center of mass offset represents the straight-line distance between the center of mass and the center of the air duct; The torque during the power module plugging and unplugging process is calculated, and the torque is limited to not exceed a second preset threshold.

2. The digital circuit breaker power module layout optimization system 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 quality and the module heat generation; The module dimensions include: module length, module width and module height; Environmental data include: ambient temperature, air density and air specific heat capacity; The air duct structural parameters include: total air duct height and effective air duct cross-sectional area; Busbar structural parameters include: busbar thickness, busbar material and number of busbar layers; Busbar electrical parameters include: busbar current and busbar resistance.

3. The digital circuit breaker power module layout optimization system according to claim 2, characterized in that: The number of power modules is determined by rounding up the ratio of the total system rated power to the power of a single module. 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.

4. The digital circuit breaker power module layout optimization system according to claim 1, characterized in that: 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.

5. The digital circuit breaker power module layout optimization system according to claim 2, characterized in that: The airflow resistance of the three sections of the duct is calculated by the corresponding resistance coefficient, air density and airflow velocity of each section of the duct. Specifically, the airflow resistance of each section of the duct is calculated by integrating the resistance coefficient, air density and the square of the airflow velocity of that section; and the total pressure loss of the system is obtained by summing up the airflow resistance of the three sections of the duct.

6. The digital circuit breaker power module layout optimization system according to claim 5, characterized in that: The fan flow rate is calculated by obtaining the effective cross-sectional area of the mixing section duct and the airflow velocity in this section respectively; and based on the effective cross-sectional area of the duct, the total height of the duct and the ambient temperature, the natural draft flow rate is calculated through the thermal pressure difference model. The fan flow rate and the natural draft flow rate are then added together to obtain the total mass flow rate.

7. The digital circuit breaker power module layout optimization system 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 structural parameters, and determining the installation position of the circuit breaker using a K-nearest neighbor algorithm based on a preset historical power module layout sample library; 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.

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

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

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