Bridge arm reactor busbar parameter optimization method and device and computer equipment

Abstract

The application relates to a bridge arm reactor busbar parameter optimization method and device and computer equipment. The method comprises the following steps: obtaining initial structure parameters of a bridge arm reactor busbar; according to the initial structure parameters, a modular method is used to determine the modular loss of each subzone of the busbar; according to the modular loss, a temperature rise constraint equation of the busbar is determined, and the initial structure parameters are optimized with the temperature rise constraint equation as an optimization target to obtain target structure parameters. The method can take the initial structure parameters of the current busbar as initial iteration values, continuously update the structure parameters through iteration, finally obtain an optimal solution of the structure parameters of the busbar, obtain optimal busbar sizes capable of effectively inhibiting temperature rise, make the temperature rise distribution more uniform, reduce the temperature rise difference of each subzone, and make the overall temperature tend to be gentle and reduced.

Description

Technical Field

[0001] This application relates to the field of theoretical design technology for bridge arm reactors, and in particular to a method, apparatus and computer equipment for optimizing busbar parameters of bridge arm reactors. Background Technology

[0002] The bridge arm reactor is a typical dry-type air-core reactor located between the flexible DC converter valve and the connecting transformer. Together with the leakage reactance of the connecting transformer, it constitutes the converter reactor of the converter station. Its main functions are controlling power transmission, filtering, and suppressing AC side current fluctuations. Additionally, it suppresses circulating current between bridge arms and the rapidly rising bridge arm fault current during short circuits. However, the bridge arm reactor differs from both the smoothing reactor used in DC transmission, which is primarily designed to withstand large DC currents, and the conventional AC reactor, which is primarily designed to withstand AC currents. During operation, it needs to withstand a considerable amplitude of combined AC and DC current. The busbar is a crucial component of the reactor, serving not only as a support but also as the channel for current to enter and exit the reactor enclosure. Therefore, the busbar bears a huge current. During reactor operation, the busbar experiences a massive current; improper design can lead to faults such as partial discharge, dendritic discharge, localized burns, and even fires. This places high demands on the structural optimization of the busbar.

[0003] Currently, there is no specific and targeted method for the structural design of busbars in bridge arm reactors. In practical engineering applications, the hollow collector rings are simply connected to the star-shaped arm using an integral welding technique, without considering the losses and heat generation of the busbars under complex operating conditions. It is difficult to optimize the design of busbar structures for large bridge arm reactors. In addition, there are no indicators for balanced temperature rise distribution in the existing reactor design requirements. Designing the size and structure of the busbar based solely on temperature rise limits and experience in engineering welding cannot effectively improve the service life of the busbar. There is a need to develop more effective methods for optimizing the design of bridge arm reactor busbar structures. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, and computer equipment for optimizing the busbar parameters of the bridge arm reactor, which can effectively optimize the busbar structure of the bridge arm reactor, in order to address the above-mentioned technical problems.

[0005] Firstly, this application provides a method for optimizing the busbar parameters of a bridge arm reactor. The method includes:

[0006] Obtain the initial structural parameters of the bridge arm reactor busbar;

[0007] Based on the initial structural parameters, a modular approach is used to determine the modular losses of each section of the busbar.

[0008] Based on modular losses, the temperature rise constraint equation of the bus is determined, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters.

[0009] In one embodiment, the initial structural parameters include the initial thickness of the star carrier arm in the bus. Based on the initial structural parameters, a modular approach is used to determine the modular losses of each section of the bus, including:

[0010] A modular approach is used to differentiate the star carrier arm according to its length;

[0011] Based on the initial thickness of the star-shaped arm, the cross-sectional area of ​​the star-shaped arm is obtained;

[0012] The loss per unit length of the star carrier arm is determined by the cross-sectional area of ​​the star carrier arm.

[0013] In one embodiment, the loss per unit length of the star carrier arm is determined by the cross-sectional area of ​​the star carrier arm, including:

[0014] Obtain the current density of the star carrier arm and the electrical parameters of the current passing through the star carrier arm;

[0015] The cross-section of the star carrier arm is differentiated by a grid, and the current density value of each grid is determined by the current density and electrical parameters of the star carrier arm.

[0016] By combining the current density value of each grid and the cross-sectional area of ​​the star carrier arm, the loss per unit length of the star carrier arm is determined.

[0017] In one embodiment, the temperature rise constraint equation for the bus is determined based on modular losses, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters, including:

[0018] The temperature rise constraint equation of the star carrier arm is determined by the loss per unit length of the star carrier arm;

[0019] The initial thickness of the star-mounted arm is optimized by using the temperature rise constraint equation of the star-mounted arm as the optimization objective, and the target thickness of the star-mounted arm is obtained.

[0020] In one embodiment, the initial structural parameters include the initial inner diameter and initial outer diameter of the center collector ring of the bus. Based on the initial structural parameters, a modular method is used to determine the modular losses of each section of the bus, including:

[0021] A modular approach is used to differentiate the central collector ring along the circumference;

[0022] Based on the initial inner and outer diameters of the central collector ring, the cross-sectional area of ​​the central collector ring is obtained.

[0023] The loss per unit circumference of the central collector ring is determined by the cross-sectional area of ​​the central collector ring.

[0024] In one embodiment, the loss per unit circumference of the central collector ring is determined by the cross-sectional area of ​​the central collector ring, including:

[0025] The cross-section of the central collector ring is differentiated through a grid, and the current density value of each grid is determined.

[0026] By combining the current density value of each grid and the cross-sectional area of ​​the central collector ring, the loss per unit circumference of the central collector ring is determined.

[0027] Secondly, this application also provides a device for optimizing the busbar parameters of a bridge arm reactor. The device includes:

[0028] The acquisition module is used to acquire the initial structural parameters of the bridge arm reactor busbar;

[0029] The module is used to determine the modular loss of each section of the busbar based on the initial structural parameters using a modular approach.

[0030] The optimization module is used to determine the temperature rise constraint equation of the busbar based on the modular loss, and to optimize the initial structural parameters with the temperature rise constraint equation as the optimization objective to obtain the target structural parameters.

[0031] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0032] Obtain the initial structural parameters of the bridge arm reactor busbar;

[0033] Based on the initial structural parameters, a modular approach is used to determine the modular losses of each section of the busbar.

[0034] Based on modular losses, the temperature rise constraint equation of the bus is determined, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters.

[0035] Fourthly, this application also provides a computer-readable storage medium. This computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0036] Obtain the initial structural parameters of the bridge arm reactor busbar;

[0037] Based on the initial structural parameters, a modular approach is used to determine the modular losses of each section of the busbar.

[0038] Based on modular losses, the temperature rise constraint equation of the bus is determined, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters.

[0039] Fifthly, this application also provides a computer program product. This computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0040] Obtain the initial structural parameters of the bridge arm reactor busbar;

[0041] Based on the initial structural parameters, a modular approach is used to determine the modular losses of each section of the busbar.

[0042] Based on modular losses, the temperature rise constraint equation of the bus is determined, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters.

[0043] The aforementioned method, apparatus, and computer equipment for optimizing the busbar parameters of the bridge arm reactor obtain the initial structural parameters of the busbar. Based on the initial structural parameters, a modular method is used to determine the modular losses of each section of the busbar. Based on the modular losses, the temperature rise constraint equation of the busbar is determined. The initial structural parameters are then optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters. In this embodiment, the busbar is divided into different parts using a modular method, and its losses are calculated for each region. The traditional isothermal method is adjusted, and the temperature rise constraint equation is obtained through thermal conductivity. The initial structural parameters of the current busbar are used as the initial iteration values. The structural parameters are continuously updated through iteration until the optimal solution for the busbar structural parameters is obtained. This results in the optimal busbar size that can effectively suppress temperature rise, making the temperature rise distribution more uniform, reducing the temperature rise difference between different sections, and making the overall temperature tend to be gentler and lower. Attached Figure Description

[0044] Figure 1 This is a diagram illustrating the application environment of the bridge arm reactor busbar parameter optimization method in one embodiment.

[0045] Figure 2 This is a flowchart illustrating a method for optimizing busbar parameters of a bridge arm reactor in one embodiment;

[0046] Figure 3 This is a schematic diagram of the structure of the bridge arm reactor busbar in one embodiment;

[0047] Figure 4 This is a schematic diagram of the temperature rise of the busbar star-laying arm in each iteration of one embodiment;

[0048] Figure 5 These are the iterative values ​​of the maximum and minimum values ​​of the bus center collector ring in one embodiment;

[0049] Figure 6 This is a structural block diagram of a bridge arm reactor busbar parameter optimization device in one embodiment;

[0050] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] The method for optimizing the busbar parameters of the bridge arm reactor provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, terminal 102 communicates with server 104 via a network. A data storage system can store the data that server 104 needs to process. The data storage system can be integrated onto server 104 or located on the cloud or other network servers. Terminal 102 can be, but is not limited to, various personal computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices can include smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, etc. Portable wearable devices can include smartwatches, smart bracelets, head-mounted devices, etc. Server 104 can be implemented using a standalone server or a server cluster consisting of multiple servers.

[0053] In one embodiment, such as Figure 2 As shown, a method for optimizing the busbar parameters of a bridge arm reactor is provided, and this method is applied to... Figure 1 Taking the server in the example, the following steps are included:

[0054] Step 202: Obtain the initial structural parameters of the bridge arm reactor busbar.

[0055] Busbars are a crucial component of reactors, serving not only as supports but also as channels for current to enter and exit the reactor enclosure. During reactor operation, the busbars bear enormous currents; improper design can lead to faults such as partial discharge, dendritic discharge, localized burns, or even fires, damaging the bridge arm reactors and causing grid instability.

[0056] This application embodiment optimizes the initial structural parameters of the bridge arm reactor busbar, wherein the initial structural parameters may refer to the structural parameters to be optimized.

[0057] In this embodiment of the application, when optimizing the initial structural parameters of the bridge arm reactor bus, the bridge arm reactor bus is divided into multiple substructures according to the basic structure of the bridge arm reactor bus, and the initial structural parameters of each substructure are optimized.

[0058] For example, the substructure of the bridge arm reactor bus may include a star arm and a center collector ring.

[0059] See Figure 3 The busbar of the bridge arm reactor includes a star-shaped arm and a central slip ring, wherein the central slip ring is a hollow ring. In practical engineering applications, the skin effect at the central slip ring is significant, resulting in large eddy current losses. Therefore, the maximum temperature rise of the busbar is located at the central slip ring, while the temperature rise of the star-shaped arm is relatively low. Due to the different temperature rise levels of the two, their structures need to be optimized separately.

[0060] Step 204: Based on the initial structural parameters, determine the modular loss of each section of the bus using a modular method.

[0061] Accurate calculation of busbar losses is the basis for calculating busbar temperature rise. However, there is currently no precise formula for calculating busbar losses. Therefore, this application adopts a modular approach to divide the busbar into different parts and calculate the losses of each part in different areas.

[0062] In the embodiments of this application, the initial structural parameters of multiple substructures of the bridge arm reactor busbar can be optimized respectively.

[0063] For example, when optimizing the initial structural parameters of the star carrier arm, a modular approach is used to determine the modular losses of each section of the star carrier arm.

[0064] For example, when optimizing the initial structural parameters of the central collector ring, a modular approach is used to determine the modular losses of each section of the central collector ring.

[0065] Step 206: Based on the modular loss, determine the temperature rise constraint equation of the busbar, and optimize the initial structural parameters with the temperature rise constraint equation as the optimization objective to obtain the target structural parameters.

[0066] After determining the modular loss of each partition in this embodiment, the temperature rise constraint equation of the bus is determined, wherein the temperature rise constraint equation of the bus includes the temperature rise constraint equation of each substructure.

[0067] For example, when optimizing the initial structural parameters of the star-frame arm, a modular method is used to determine the modular loss of each section of the star-frame arm, and the temperature rise constraint equation of the star-frame arm is determined based on the modular loss of each section of the star-frame arm. Thus, the temperature rise constraint equation is used as the optimization objective to gradually reduce the temperature rise difference between adjacent sections. The initial thickness of the star-frame arm is continuously updated through iteration, and finally the optimal solution for the thickness is obtained.

[0068] Furthermore, the embodiments of this application can also adjust the traditional isothermal rise method according to the different substructures. By setting the thermal conductivity, the temperature rise constraint equation of each substructure of the busbar is modified, and the temperature rise requirements of each substructure component are verified. Through iterative updates of structural parameters, the structural parameters of the busbar are finally optimized.

[0069] In the above-mentioned method for optimizing the busbar parameters of the bridge arm reactor, the initial structural parameters of the busbar of the bridge arm reactor are obtained. Based on the initial structural parameters, the modular loss of each section of the busbar is determined using a modular method. Based on the modular loss, the temperature rise constraint equation of the busbar is determined. The initial structural parameters are then optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters. In this embodiment, the busbar is divided into different parts using a modular method, and its loss is calculated in different regions. The traditional isothermal method is adjusted, and the temperature rise constraint equation is obtained after modification through thermal conductivity. The initial structural parameters of the current busbar are used as the initial iteration values. The structural parameters are continuously updated through iteration, and finally the structural parameters of the busbar are optimized to obtain the optimal solution. This results in the optimal busbar size that can effectively suppress temperature rise, making the temperature rise distribution more uniform, reducing the temperature rise difference between different sections, and making the overall temperature more gradual and lower.

[0070] In one embodiment, the initial structural parameters include the initial thickness of the star carrier arm in the busbar. Based on the initial structural parameters, the modular loss of each section of the busbar is determined modularly, including:

[0071] Step A1: Using a modular approach, the star carrier arm is differentiated according to its length.

[0072] Step A2: Based on the initial thickness of the star carrier arm, obtain the cross-sectional area of ​​the star carrier arm.

[0073] Step A3: Determine the loss per unit length of the star carrier arm by using the cross-sectional area of ​​the star carrier arm.

[0074] Accurate calculation of busbar losses is the basis for calculating busbar temperature rise. However, there is currently no precise formula for calculating busbar losses. Therefore, this application adopts a modular approach to divide the busbar into different parts and calculates the losses of each part in different areas.

[0075] In this embodiment of the application, when designing the thickness of the star frame arm, the star frame arm is differentiated according to its length to obtain the AC loss per unit length. Given the size of the busbar star frame arm, the power loss per unit length of the busbar star frame arm can be obtained. Then, iterative calculation can be performed through the temperature rise constraint equation and the size of the star frame arm can be corrected according to the temperature rise value. Finally, the optimal thickness value of the star frame arm is calculated.

[0076] This embodiment employs a modular approach, differentiating the star frame arm according to its length. Based on the initial thickness of the star frame arm, the cross-sectional area of ​​the star frame arm is obtained. By using the cross-sectional area of ​​the star frame arm, the loss per unit length of the star frame arm is determined, thus obtaining the power loss per unit length of the busbar star frame arm.

[0077] In one embodiment, determining the loss per unit length of the star carrier arm using its cross-sectional area includes:

[0078] Step B1: Obtain the current density of the star carrier arm and the electrical parameters of the current passing through the star carrier arm.

[0079] Step B2 involves differentiating the cross-sectional grid of the star carrier arm and determining the current density value of each grid using the current density and electrical parameters of the star carrier arm.

[0080] Step B3: Combine the current density value of each grid and the cross-sectional area of ​​the star carrier arm to determine the loss per unit length of the star carrier arm.

[0081] In this embodiment, the AC loss is first calculated for each star arm. Since each star arm of the busbar is centrally symmetrical with the central collector ring, and the shape and operating state of each star arm are completely identical, the loss can be calculated for one star arm only. The electromagnetic characteristics of a high-current conductor system depend on the current density distribution in the conductor. Let the current density in the star arm be J, and the current density vector be:

[0082]

[0083] In the formula, A is the vector position. Let σ be a scalar potential and σ be the conductivity. The star arm is a long straight conductor, and its axis is assumed to coincide with the OZ axis of the rectangular coordinate system. The current in the star arm is along the Z-axis. After neglecting the influence of displacement current, equation (1) can be transformed into a scalar equation:

[0084]

[0085] Among them, the star-mounted arm current J z The resulting vector bit A z It should be:

[0086]

[0087] In the formula, μ is the magnetic permeability coefficient, r is the distance from any point to the infinitesimal area dS, and the integral is performed over the entire conductor cross section S.

[0088] Substituting (3) into equation (2), we get:

[0089]

[0090] If an alternating current with angular frequency ω is passed through the medium air, then the time-harmonic field form of equation (4) is:

[0091]

[0092] Divide the star-shaped arm into sections using a square grid. If the grid is small enough, the current density in each grid can be approximated as a constant. Neglecting the subscript z, the current density in the i-th grid can be written in the following discrete form:

[0093]

[0094] Where i = 1, 2, 3, ..., N, x i y i These are the coordinates of the center point of the i-th grid. Integrating over the cross section S of each small grid... n =Δx n Δy n =h 2 Proceed. Transform equation (6) to suit computer programming:

[0095]

[0096] Where i = 1, 2, 3, ..., N. Furthermore, the sum of the total currents within the grid is equal to the given total current I of the conductor, i.e.:

[0097]

[0098] Combining equations (7) and (8) yields a system of complex linear equations of order N+1.

[0099] make Then (7) becomes:

[0100]

[0101] Rewrite the above equation in matrix form.

[0102] KJ = I (10)

[0103] Where K is an N+1 order square matrix, and when i≠j, we have:

[0104]

[0105] When i = j, K i,j =A, then:

[0106] J = [J1, J2, ..., J N-1 J N J S (12)

[0107] I = [0,0,...,0,0,I0 / h] 2 (13)

[0108] The current density partial matrix J can be obtained through matrix calculation, thus yielding the current density value for each grid cell, and subsequently, the AC loss for each grid cell can be calculated.

[0109]

[0110] The AC loss per unit length is:

[0111]

[0112] Given the cross-sectional area of ​​the busbar star array arm, the power loss per unit length of the busbar star array arm can be calculated.

[0113] This embodiment obtains the current density of the star-mounted arm and the electrical parameters of the current passing through the star-mounted arm, differentiates the cross-sectional grid of the star-mounted arm, and determines the current density value of each grid by using the current density and electrical parameters of the star-mounted arm. By combining the current density value of each grid with the cross-sectional area of ​​the star-mounted arm, the loss per unit length of the star-mounted arm can be determined.

[0114] In one embodiment, the temperature rise constraint equation for the bus is determined based on modular losses, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters, including:

[0115] Step C1: Determine the temperature rise constraint equation for the star carrier arm based on the loss per unit length of the star carrier arm.

[0116] Step C2: Optimize the initial thickness of the star-frame arm using the temperature rise constraint equation of the star-frame arm as the optimization objective, and obtain the target thickness of the star-frame arm.

[0117] The traditional isothermal rise method is used to calculate the temperature rise of reactor enclosures, ensuring that the calculated temperature rise of each enclosure coil is equal. In the actual temperature rise calculation, the physical quantity used is thermal radiation q, expressed as:

[0118]

[0119] To make the thermal radiation q equal, we need to make the temperature rise equal, i.e., q i=q j (where i≠j), that is:

[0120]

[0121] Where i is not equal to j, n i I is the number of turns of encapsulation i. i J is the total current encapsulating i. i This refers to the current density under AC / DC combined operating conditions.

[0122] Adjusting equation (17), the isothermal rise constraint equation for the busbar star-shaped arm can be expressed as:

[0123]

[0124] Where, α i Let α be the cross-sectional area of ​​the i-th section. j Let be the cross-sectional area of ​​the j-th section.

[0125] Using the isothermal rise constraint equation of the star-shaped arm as the optimization objective, ... and The gap between them gradually narrows, thereby optimizing the initial thickness of the star carrier arm and obtaining the target thickness of the star carrier arm.

[0126] In one implementation, H is set ij Let be the thermal conductivity of the star-shaped arm, used to characterize the thermal conductivity of the star-shaped arm from the i-th cross section to the j-th cross section. Then, equation (18) can be rewritten as:

[0127]

[0128] When designing the thickness of the star frame arm, the star frame arm is differentiated by its length to determine the AC loss per unit length. Then, the AC loss per unit length can be calculated using equation (19). and the j-th section Then calculate the heat transfer coefficient H of section i and section j. ij The temperature rise of each section can be calculated by superimposing the heat transfer of each section. This temperature rise is then compared with the temperature rise required in actual production. If the requirements are not met, the thickness structural parameters of the star frame arm are adjusted and iterative calculation is performed again. Then, the star frame arm size is corrected according to the temperature rise value through iterative calculation, and finally the optimal thickness value of the star frame arm is calculated.

[0129] This embodiment determines the temperature rise constraint equation of the star frame arm by the loss per unit length of the star frame arm, and optimizes the initial thickness of the star frame arm by using the temperature rise constraint equation of the star frame arm as the optimization target to obtain the target thickness of the star frame arm. Iterative optimization of the initial structural parameters can be performed to obtain the optimal thickness value.

[0130] In one embodiment, the existing structure of the central collector ring is a circular ring. Under the combined operating conditions of AC and DC superposition, eddy currents are generated. Due to the skin effect, significant eddy current losses occur on the surface, leading to a high temperature rise in the collector ring. To suppress the temperature rise of the central collector ring, the structure of the collector ring needs to be optimized. For example, the initial inner and outer diameters of the central collector ring can be obtained and optimized to reduce the temperature difference between the various cross-sections, resulting in a more uniform temperature distribution and thus suppressing localized temperature rise.

[0131] By transforming Maxwell's equations, we can obtain:

[0132]

[0133] make achievable

[0134]

[0135] Solving for:

[0136]

[0137] In the formula, I0(kr) and K0(kr) are the zero-order Bessel functions of the first and second type of abnormalities, respectively; and It is a constant determined by the boundary conditions.

[0138] Therefore, we have:

[0139]

[0140] Let the initial outer diameter of the central collector ring be *a* and the initial inner diameter be *b*. The constant can be obtained using the characteristics of the modified Bessel function. and And we can conclude that:

[0141]

[0142]

[0143] Therefore, we get:

[0144]

[0145] Divide the cross-section of the central collector ring into a square grid. If the grid is small enough, the current density in each grid can be approximated as a constant. The current density in the i-th grid can be written in the following discrete form:

[0146]

[0147] In practical calculations using the traditional isothermal rise method, the physical quantity used is thermal radiation q, expressed as:

[0148]

[0149] To make the thermal radiation q equal, we need to make the temperature rise equal, i.e., q i =q j (where i≠j), that is:

[0150] (where i is not equal to j)(28)

[0151] Where, n i I is the number of turns of encapsulation i. i J is the total current encapsulating i. i This refers to the current density under AC / DC combined operating conditions.

[0152] Adjusting equation (28), the isothermal rise constraint equation for the central collector ring of the busbar can be expressed as:

[0153]

[0154] Using the isothermal rise constraint equation of the central collector ring as the optimization objective, and The gap between them gradually narrows, thereby optimizing the initial inner diameter and initial outer diameter of the central collector ring to obtain the target inner diameter and target outer diameter of the central collector ring.

[0155] In one implementation, T is set. ij Let be the thermal conductivity of the central collector ring, then equation (29) can be rewritten as follows:

[0156]

[0157] Furthermore, due to the significant skin effect caused by the hollow ring structure under combined AC and DC operating conditions, the thermal radiation difference of the cross-section needs to be constrained.

[0158]

[0159] When designing the busbar center slip ring of the bridge arm reactor, the center slip ring is differentiated along the circumference to determine the AC loss per unit circumference. Then, the i-th cross-section can be calculated using equation (30). and the j-th section Next, calculate the thermal conductivity T of cross-sections i and j. ijThen, the temperature rise of each section can be calculated by superimposing the heat conduction of each section. This temperature rise is compared with the temperature rise required in actual production. If the requirements are not met, the inner and outer diameter structural parameters of the central collector ring are adjusted and iterative calculation is performed. Then, the inner and outer diameter dimensions of the central collector ring are corrected through iterative calculation and constraint condition (31). Finally, the optimal value of the structural dimensions is calculated.

[0160] In this embodiment, by employing the modular method, the central collector ring is differentiated according to the circumference. Based on the initial inner and outer diameters of the central collector ring, the loss per unit circumference of the central collector ring is determined through the current density value of each grid. The temperature rise constraint equation of the central collector ring is improved, and iterative calculations can be performed through the constraint equations. The inner and outer diameters of the central collector ring can be corrected through the constraint conditions, and finally the optimal value of the structural dimensions is calculated.

[0161] In one embodiment, taking the converter valve arm reactor of a ±800kV UHV flexible DC project as an example, it was found in the temperature rise test that the temperature rise of the hot spot of the central collector ring of the upper and lower aluminum busbars of the reactor exceeded the standard and was greater than the value required by the agreement.

[0162] The design is completed according to the steps of the busbar parameter optimization method for the bridge arm reactor provided in this application embodiment. For the AC / DC operating conditions of the bridge arm reactor, the busbar size is designed based on the isothermal rise method and a modular calculation process. Using the current busbar size as the initial iteration value, the optimal busbar size that can effectively suppress temperature rise is obtained through continuous correction of the iteration equation and constraint equation, and verified by temperature field distribution calculation. After four iterations, the difference between the maximum and minimum temperature rise of the star-frame arm is reduced from 10.092K to 3.8416K. The temperature rise diagram during the iteration process is shown below. Figure 4 As shown.

[0163] The optimization results show that the temperature difference for the central collector ring, which has a higher temperature rise, has been reduced, and the overall temperature rise is now lower than the temperature rise of the original collector ring size. The curves showing the maximum and minimum temperature rise of the central collector ring during iteration are as follows: Figure 5 As shown.

[0164] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0165] Based on the same inventive concept, this application also provides a bridge arm reactor busbar parameter optimization device for implementing the aforementioned bridge arm reactor busbar parameter optimization method. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more bridge arm reactor busbar parameter optimization device embodiments provided below can be found in the limitations of the bridge arm reactor busbar parameter optimization method described above, and will not be repeated here.

[0166] In one embodiment, such as Figure 6 As shown, a device for optimizing busbar parameters of a bridge arm reactor is provided, comprising: an acquisition module 602, a determination module 604, and an optimization module 606, wherein:

[0167] The acquisition module 602 is used to acquire the initial structural parameters of the bridge arm reactor busbar.

[0168] The determination module 604 is used to determine the modular loss of each partition of the busbar using a modular method based on the initial structural parameters.

[0169] The optimization module 606 is used to determine the temperature rise constraint equation of the busbar based on the modular loss, and to optimize the initial structural parameters with the temperature rise constraint equation as the optimization target to obtain the target structural parameters.

[0170] Each module in the aforementioned bridge arm reactor bus parameter optimization device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0171] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The database stores basic busbar data. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a method for optimizing busbar parameters of a bridge arm reactor.

[0172] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0173] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0174] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0175] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0176] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0177] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0178] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0179] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for optimizing busbar parameters of a bridge arm reactor, characterized in that, The method includes: Obtain the initial structural parameters of the bridge arm reactor busbar; Based on the initial structural parameters, the modular loss of each section of the busbar is determined using a modular approach. Based on the modular loss, the temperature rise constraint equation of the busbar is determined, and the initial structural parameters are optimized using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters; The initial structural parameters include the initial thickness of the star carrier arm in the busbar. The determination of the modular loss of each section of the busbar using a modular method based on the initial structural parameters includes: Using the modular method described above, the star carrier arm is differentiated according to its length; Based on the initial thickness of the star carrier arm, the cross-sectional area of ​​the star carrier arm is obtained; Obtain the current density of the star carrier arm and the electrical parameters of the current passing through the star carrier arm; The cross-section of the star carrier arm is differentiated by a grid, and the current density value of each grid is determined by the current density of the star carrier arm and the electrical parameters. By combining the current density value of each grid and the cross-sectional area of ​​the star carrier arm, the loss per unit length of the star carrier arm is determined; The process involves determining the temperature rise constraint equation for the busbar based on the modular loss, and then optimizing the initial structural parameters using the temperature rise constraint equation as the optimization objective to obtain the target structural parameters, including: The temperature rise constraint equation of the star carrier arm is determined by the loss per unit length of the star carrier arm; The initial thickness of the star-frame arm is optimized using the temperature rise constraint equation of the star-frame arm as the optimization objective, so as to obtain the target thickness of the star-frame arm. Alternatively, the initial structural parameters include the initial inner and outer diameters of the center collector ring of the busbar, and the determination of the modular losses of each section of the busbar using a modular method based on the initial structural parameters includes: Using the modular method described above, the central collector ring is differentiated along the circumference; Based on the initial inner diameter and initial outer diameter of the central collector ring, the cross-sectional area of ​​the central collector ring is obtained; The loss per unit circumference of the central collector ring is determined by the cross-sectional area of ​​the central collector ring.

2. The method according to claim 1, characterized in that, Determining the loss per unit circumference of the central collector ring using its cross-sectional area includes: The cross-section of the central collector ring is differentiated through a grid, and the current density value of each grid is determined. By combining the current density value of each grid and the cross-sectional area of ​​the central collector ring, the loss per unit circumference of the central collector ring is determined.

3. A device for optimizing busbar parameters of a bridge arm reactor, characterized in that, The device includes: The acquisition module is used to acquire the initial structural parameters of the bridge arm reactor busbar; The determination module is used to determine the modular loss of each partition of the busbar based on the initial structural parameters using a modular method. An optimization module is used to determine the temperature rise constraint equation of the busbar based on the modular loss, and to optimize the initial structural parameters with the temperature rise constraint equation as the optimization target to obtain the target structural parameters. The initial structural parameters include the initial thickness of the star-frame arm in the busbar. The determining module is specifically used for: differentiating the star-frame arm according to its length using the modular method; obtaining the cross-sectional area of ​​the star-frame arm based on its initial thickness; obtaining the current density of the star-frame arm and the electrical parameters of the current flowing through it; differentiating the cross-section of the star-frame arm using a grid, and determining the current density value of each grid using the current density of the star-frame arm and the electrical parameters; and determining the loss per unit length of the star-frame arm by combining the current density value of each grid and the cross-sectional area of ​​the star-frame arm. The optimization module is specifically used to: determine the temperature rise constraint equation of the star frame arm based on the loss per unit length of the star frame arm; optimize the initial thickness of the star frame arm using the temperature rise constraint equation of the star frame arm as the optimization target, and obtain the target thickness of the star frame arm. Alternatively, the initial structural parameters include the initial inner diameter and initial outer diameter of the central collector ring of the busbar. The determining module is specifically used to: differentiate the central collector ring according to the circumference using the modular method; obtain the cross-sectional area of ​​the central collector ring based on the initial inner diameter and initial outer diameter of the central collector ring; and determine the loss per unit circumference of the central collector ring using the cross-sectional area of ​​the central collector ring.

4. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

6. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

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