Electromagnetic field-based extra-high voltage reactor loss acquisition method and system
By using a method based on electromagnetic fields and the finite element method, the total loss of the UHV reactor and the losses of its various parts are accurately calculated, which solves the problem of inaccurate loss calculation in the existing technology and achieves more accurate loss assessment and design optimization.
Patent Information
- Application Number
- CN202510734370.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2025-09-26
AI Technical Summary
When calculating UHV reactor losses, existing technologies have difficulty accurately reflecting the loss distribution in complex electromagnetic field environments, resulting in a large deviation between the calculated results and the actual values.
By adopting an electromagnetic field-based method combined with the finite element method, the total loss, stray loss, winding loss and core loss of the UHV reactor are accurately calculated through solving Maxwell's equations and finite element software simulation.
The accurate calculation and detailed decomposition of UHV reactor losses are achieved, the calculation accuracy is improved, and reliable technical support is provided for reactor performance evaluation and optimization design.
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Figure CN120706143A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ultra-high voltage reactors, and in particular to an electromagnetic field-based method and system for acquiring ultra-high voltage reactor losses. Background Art
[0002] In ultra-high voltage (UHV) power systems, reactor losses directly impact the overall performance, service life, and operational reliability of the equipment. With the rapid development of UHVDC transmission technology, the performance requirements for reactors are increasing. Accurate loss calculation, in particular, has become a key factor restricting equipment design optimization and safe operation. Traditional loss calculation methods, primarily based on empirical formulas or simplified models, struggle to accurately reflect the true distribution of losses in complex electromagnetic field environments. Due to the magnetic flux inhomogeneity and harmonic components in the reactor core, traditional circuit methods and finite element methods, when applied alone, suffer from insufficient calculation accuracy and low efficiency. Existing technologies often use simplified models or empirical formulas to calculate UHV reactor losses, which makes it difficult to accurately reflect the actual losses of reactors in complex electromagnetic environments, resulting in large deviations between the calculated results and the actual values. Summary of the Invention
[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method and system for obtaining ultra-high voltage reactor losses based on electromagnetic fields, which adds up the core loss, stray loss and winding loss to obtain the ultra-high voltage reactor losses of the electromagnetic field. It can accurately calculate the loss values of each part of the reactor under rated voltage and rated current load, significantly improving the calculation accuracy.
[0004] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.
[0005] According to a first aspect of the present application, a method for obtaining UHV reactor loss based on an electromagnetic field is provided, comprising: Obtaining the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor; Solve the electromagnetic field problem of the UHV reactor based on the finite element method to obtain the stray losses of the reactor casing and internal structural components; Obtaining the DC resistance loss and the eddy current loss of the winding, and adding the DC resistance loss and the eddy current loss to obtain the winding loss; The core loss is obtained by subtracting the stray loss and winding loss from the total loss of the UHV reactor.
[0006] In some embodiments of the present application, based on the aforementioned solution, obtaining the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor specifically includes: Under the rated operating conditions of the UHV reactor, the total loss of the UHV reactor is measured through the reactor loss test.
[0007] In some embodiments of the present application, based on the above solution, the electromagnetic field problem of the UHV reactor is solved using the finite element method to obtain the stray loss, specifically including: The electromagnetic field problem of the UHV reactor is converted into the solution of Maxwell's equations, which can be expressed as:
[0008]
[0009]
[0010]
[0011] in, is the magnetic field strength; is the current density; is the electric flux density; is the electric field strength; is the magnetic flux density; is the charge density; The parameters of Maxwell's equations are constrained based on the constitutive equations, and the calculation formula is:
[0012]
[0013]
[0014] in, is the magnetic permeability of the field medium; is the conductivity of the field medium; is the dielectric constant of the field medium; The mathematical model of the eddy current field is established, and the calculation formula is:
[0015]
[0016] in, is the vector magnetic potential; is the scalar potential; Introducing the Coulomb gauge and ignoring the influence of displacement current, the complete description of the electromagnetic field problem in the eddy current region and the non-eddy current region of the conductor is as follows:
[0017]
[0018] in, It is the eddy current region, in which there is a conductive medium but no passive current; is the non-eddy current region, which contains the given source current, source current density Not 0; numerically solve Maxwell's equations; A UHV reactor electromagnetic field simulation analysis model is established in finite element software. The UHV reactor electromagnetic field simulation analysis model includes the reactor housing and internal structural components. Based on the solved Maxwell equations, the finite element method is used to extract the stray loss of each finite element in the reactor housing and internal structural components. The stray loss in the reactor housing and internal structural components is calculated using the following formula:
[0019] in, It is The conductivity of each finite element; It is The eddy current density vector of each finite element; It is The conjugate eddy current density vector of each finite element; It is The volume of a finite element; is the number of elements in the overall meshing unit of the steel plate, Represents a real number.
[0020] In some embodiments of the present application, based on the aforementioned solution, the finite element method is an edge element method.
[0021] In some embodiments of the present application, based on the above solution, the calculation formula for obtaining the DC resistance loss of the winding is: ; in, is the winding current; is the DC resistance of the winding.
[0022] In some embodiments of the present application, based on the above solution, a method for obtaining winding eddy current loss specifically includes: Divide the winding into several coils; The unit transverse eddy current loss and unit longitudinal eddy current loss in the volume formed by each coil along the circumference are obtained and expressed as: Unit transverse eddy current loss:
[0023] in, For the The distance from the center of gravity of each coil to the center line of the core; For the The area occupied by the conductor in each coil; is the angular frequency; is the width of the wire size; For the Transverse magnetic flux density within each coil; is the resistivity of the material; Unit longitudinal eddy current loss:
[0024] in, is the height of the wire size; The unit winding loss is obtained by adding the unit longitudinal eddy current loss and the unit longitudinal eddy current loss; The winding losses are obtained by summing up all the unit winding losses.
[0025] In some embodiments of the present application, based on the above scheme, the core loss can be decomposed into core hysteresis loss, core eddy current loss, and core additional loss, and the calculation formula is:
[0026]
[0027]
[0028]
[0029] in, is the core loss, is the core hysteresis loss; is the core eddy current loss; is the additional loss of the core; is the frequency, Hz; is the maximum value of the core magnetic flux density; 、 、 and is a constant that is independent of frequency.
[0030] According to a second aspect of the present application, a system for acquiring UHV reactor losses based on an electromagnetic field is provided, comprising: A first acquisition module is used to obtain the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor; The second acquisition module is used to solve the electromagnetic field problem of the UHV reactor based on the finite element method to obtain the stray losses of the reactor casing and internal structural parts; A third acquisition module is used to obtain the winding DC resistance loss and the winding eddy current loss, and to obtain the winding loss by adding the winding DC resistance loss and the winding eddy current loss; The fourth acquisition module is used to obtain the core loss by subtracting the stray loss and the winding loss from the total loss of the ultra-high voltage reactor.
[0031] According to a third aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a processor, the above method is implemented. According to a fourth aspect of the present application, an electronic device is provided, including: one or more processors; The memory is used to store executable instructions of the processor. When the executable instructions are executed by one or more processors, the one or more processors implement the above method.
[0032] The beneficial effects of this application are as follows: The present invention can not only calculate the overall loss of UHV reactors, but also accurately decompose the total loss into specific components such as core loss, stray loss of the casing and internal structural parts, DC resistance loss of the winding and eddy current loss of the winding. This decomposition capability provides strong support for the performance evaluation and optimal design of the reactor.
[0033] The present invention is based on the UHV reactor loss test and combines finite element software to construct a refined UHV reactor electromagnetic field simulation analysis model, which can accurately calculate the loss values of each part of the UHV reactor under rated operating conditions, significantly improving the calculation accuracy.
[0034] The present invention realizes the deep integration of UHV reactor loss test and finite element simulation. The total loss of UHV reactor under rated operating conditions is obtained through the UHV reactor loss test, providing a verification and calibration basis for the simulation model. At the same time, the electromagnetic field inside the reactor is finely simulated using the UHV reactor electromagnetic field simulation analysis model, providing theoretical support for the in-depth analysis of the test results.
[0035] This invention comprehensively considers the effects of both DC resistance loss and eddy current loss when calculating winding losses. Finite element simulation analysis accurately assesses eddy current losses under high-frequency excitation, providing an important basis for heat dissipation design and temperature rise control in UHV reactors.
[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a flow chart of the method for obtaining UHV reactor loss based on electromagnetic field according to the present invention; Figure 2 Schematic diagram of an overall electromagnetic field simulation analysis model of a UHV reactor according to a specific embodiment of the present invention; Figure 3 Schematic diagram of a UHV reactor core according to a specific embodiment of the present invention; Figure 4 A schematic diagram of the overall structure of a UHV reactor winding according to a specific embodiment of the present invention; Figure 5 Schematic diagram of the overall magnetic field distribution of the winding when the current is the amplitude according to a specific embodiment of the present invention; Figure 6 Schematic diagram of the transverse leakage magnetic field distribution of each coil in the first coil of an ultra-high voltage reactor according to a specific embodiment of the present invention; Figure 7 Schematic diagram of the distribution of transverse eddy current losses in each coil of the first coil of an ultra-high voltage reactor according to a specific embodiment of the present invention; Figure 8 Schematic diagram of the electromagnetic field-based UHV reactor loss acquisition system of the present invention. DETAILED DESCRIPTION
[0038] Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Although the present invention will be described in conjunction with specific embodiments, it will be understood that this is not intended to limit the invention to those embodiments. On the contrary, it is intended to cover variations, modifications, and equivalents within the spirit and scope of the present invention as defined by the appended claims. It should be noted that the method steps described herein can be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of the two.
[0039] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0040] Note: The following example is only a specific example and is not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequence, etc. Those skilled in the art can apply the concepts of the present invention to construct more embodiments not described in this specification by reading this specification.
[0041] See also Figure 1The figure shows a flow chart of the electromagnetic field-based method for obtaining UHV reactor losses according to the present invention. This embodiment provides an electromagnetic field-based method for obtaining UHV reactor losses, combining UHV reactor loss testing with finite element analysis to address existing issues in UHV reactor loss calculations, such as insufficient accuracy, inaccurate loss component decomposition, insufficient integration of testing and simulation, and incomplete winding loss calculation. This method enables accurate calculation and effective decomposition of the overall UHV reactor loss and its components, providing reliable technical support for reactor performance evaluation, optimized design, and safe operation.
[0042] According to the first aspect of the present application, this embodiment provides a method for obtaining UHV reactor loss based on an electromagnetic field, comprising: Step 1: Obtain the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor.
[0043] Existing technologies make it difficult to accurately decompose reactor losses into specific components, including core losses, stray losses in the casing and internal components, DC resistance losses in the windings, and eddy current losses in the windings. This ambiguity not only hinders in-depth evaluation of reactor performance but also limits the effectiveness of optimized design.
[0044] In some embodiments of this embodiment, the UHV reactor must meet a series of electrical, mechanical, and thermodynamic performance requirements under rated operating conditions to ensure its stability and reliability in the high-voltage power grid. Generally, the rated operating conditions refer to the UHV reactor operating under rated parameters, which include voltage level, rated voltage, rated capacity, rated current, insulation level, etc.
[0045] The UHV reactor core is made of stacked high-permeability silicon steel sheets. During operation, the UHV reactor will experience certain losses in the core due to the hysteresis effect of the magnetic material and the eddy current effect of the silicon steel sheets in a changing magnetic field. The UHV reactor winding will also experience certain losses due to its own resistance and the leakage magnetic field near the winding conductors. In addition, the internal metal structural parts and metal casing of the UHV reactor will also generate certain stray losses under the action of the UHV reactor's leakage magnetic field.
[0046] In general, the total loss of UHV reactor includes core loss, stray loss and winding loss, and the calculation formula is:
[0047] in, is the total loss of the UHV reactor; is the core loss; is the winding loss, is stray loss.
[0048] The total loss of the UHV reactor under rated operating conditions can be directly measured through the UHV reactor loss test. After obtaining the total loss of the UHV reactor, the core loss can be obtained by subtracting the stray loss and winding loss.
[0049] Step 2: Solve the electromagnetic field problem of the UHV reactor based on the finite element method to obtain the stray losses of the reactor casing and internal structural components.
[0050] In some implementation methods of this embodiment, the stray losses of the UHV reactor are mainly composed of eddy current losses on the internal metal structural parts and the outer casing of the UHV reactor. The eddy current losses on the internal metal structural parts and the outer casing of the UHV reactor can be calculated using the magnetic field of the UHV reactor.
[0051] Specifically, the finite element method is used to solve the electromagnetic field problem of the UHV reactor and obtain the stray losses, including: The electromagnetic field problem of the UHV reactor is converted into the solution of Maxwell's equations, which can be expressed as:
[0052]
[0053]
[0054]
[0055] in, is the magnetic field intensity, A / m; is the current density, A / m 2 ; is the electric flux density, C / m 2 ; is the electric field strength, V / m; is the magnetic flux density, Wb / m 2 ; is the charge density, C / m 3 ; The parameters of Maxwell's equations are constrained based on the constitutive equations, and the calculation formula is:
[0056]
[0057]
[0058] in, is the magnetic permeability of the field medium, H / m; is the conductivity of the field medium, S / m; is the dielectric constant of the field medium, F / m; This embodiment adopts the commonly used A, φ-A method to establish the mathematical model of the eddy current field, and the calculation formula is:
[0059]
[0060] in, is the vector magnetic potential; is the scalar potential; Introducing the Coulomb gauge and ignoring the influence of displacement current, the complete description of the electromagnetic field problem in the eddy current region and the non-eddy current region of the conductor is as follows:
[0061]
[0062] in, It is the eddy current region, in which there is a conductive medium but no passive current; is the non-eddy current region, which contains the given source current, source current density Not 0; numerically solve Maxwell's equations; The electromagnetic field simulation analysis model of the UHV reactor is established in the finite element software. The UHV reactor electromagnetic field simulation analysis model includes the reactor housing and internal structural components. Based on the solved Maxwell equations, the finite element method is used to extract the stray loss of each finite element unit in the reactor housing and internal structural components. The stray loss in the reactor housing and internal structural components is obtained. The calculation formula is:
[0063] in, It is The conductivity of each unit; It is The eddy current density vector of each unit; It is The conjugate eddy current density vector of each element; It is The volume of a unit; is the number of elements in the overall meshing unit of the steel plate, Represents a real number.
[0064] In some embodiments of this embodiment, the finite element method is an edge element method. The edge element method uses the line integral of the vector magnetic potential A on the element edge and the scalar potential φ on the element node as the degrees of freedom. In solving the electromagnetic field of complex models, it can well handle the interfaces of various materials.
[0065] Step 3: Obtain the winding DC resistance loss and the winding eddy current loss, and add the winding DC resistance loss and the winding eddy current loss to obtain the winding loss.
[0066] Existing methods for calculating winding losses often only consider the DC resistance losses of the windings, while ignoring the eddy current losses of the windings under high-frequency excitation. This incomplete calculation method cannot accurately assess the actual heating conditions of the windings, which may cause the reactor to overheat or even damage.
[0067] The winding loss of UHV reactor includes DC resistance loss of winding, eddy current loss of winding and circulating current loss of conductor. Among them, DC resistance loss accounts for the major part, and the circulating current loss of conductor is very small and is generally ignored.
[0068] In some embodiments of this embodiment, the winding loss is obtained by adding the winding DC resistance loss and the winding eddy current loss, and the calculation formula is:
[0069] in, is the DC resistance loss of the winding, is the winding loss.
[0070] In some embodiments of this embodiment, the calculation formula for obtaining the DC resistance loss of the winding is: ; in, is the winding current; is the DC resistance of the winding.
[0071] In some embodiments of this embodiment, the leakage magnetic field of the winding can be divided into transverse leakage magnetic field and longitudinal leakage magnetic field, and thus the winding loss can be divided into transverse eddy current loss and longitudinal eddy current loss.
[0072] In this embodiment, the method for obtaining the winding eddy current loss specifically includes: Divide the winding into several units; Obtain the unit transverse eddy current loss and unit longitudinal eddy current loss in the volume formed by each unit along the circumference, expressed as: Unit transverse eddy current loss:
[0073] in, For the The distance from the center of gravity of each unit to the center line of the core; For the The area occupied by the conductor in each unit; is the angular frequency; is the width of the wire size; For the Transverse magnetic flux density within each unit; is the resistivity of the material; Unit longitudinal eddy current loss:
[0074] in, is the height of the wire size; The unit winding loss is obtained by adding the unit transverse eddy current loss and the unit longitudinal eddy current loss. The calculation formula is: ; The winding losses are obtained by summing up all the unit winding losses.
[0075] Step 4: Subtract stray loss and winding loss from the total loss of the UHV reactor to obtain the core loss.
[0076] In related technologies, when calculating core loss, the average magnetic flux density or simplified formula is usually used, ignoring the impact of uneven magnetic flux distribution and harmonic components on loss, resulting in a large deviation between the calculated results and the actual values.
[0077] In some embodiments of this embodiment, the core loss can be decomposed into core hysteresis loss, core eddy current loss, and core additional loss, and the calculation formula is:
[0078]
[0079]
[0080]
[0081] in, is the core loss, is the core hysteresis loss; is the core eddy current loss; is the additional loss of the core; is the frequency, Hz; is the maximum value of the core magnetic flux density; 、 、 and is a constant that is independent of frequency.
[0082] In summary, this embodiment innovatively proposes a loss calculation method that deeply combines UHV reactor loss test data with a constructed finite element analysis model. By conducting UHV reactor loss tests under rated voltage and rated current load, the actual overall loss value is obtained; at the same time, the finite element analysis model is used to accurately simulate the complex electromagnetic field inside the UHV reactor. This method fully considers the actual operating conditions and electromagnetic field distribution characteristics of the UHV reactor, breaking through the limitations of traditional simplified models or empirical formulas. It can accurately calculate the overall loss of the UHV reactor in a complex electromagnetic environment, providing more accurate basic data for UHV reactor performance evaluation.
[0083] This embodiment has the ability to accurately decompose the overall loss of the UHV reactor into specific components such as core loss, eddy current loss of the casing and internal structural parts, DC resistance loss of the winding, and eddy current loss of the winding. Based on the overall loss test value, an electromagnetic field simulation analysis model of the UHV reactor is established in finite element software to conduct an in-depth analysis of the electromagnetic characteristics of different components of the UHV reactor. For example, the model accurately simulates the eddy current distribution of the casing and internal structural parts in the electromagnetic field and accurately calculates their stray losses; combined with the experimentally measured DC resistance of the reactor and the finite element simulation results of the winding under high-frequency excitation, the DC resistance loss of the winding and the eddy current loss of the winding are calculated respectively. This precise loss component decomposition technology helps to gain a deeper understanding of the loss characteristics of each part of the UHV reactor and provide targeted guidance for the optimized design of the reactor.
[0084] In one specific embodiment, see Figure 2-Figure 4 As shown in the figure, a set of overall models of 1000kV UHV reactors was established. The established model includes the UHV reactor metal shell, internal structural parts, core and winding and other key structures. The rated working condition is calculated. At the same time, the overall magnetic field distribution of the winding under the current assignment condition is referred to Figure 5 As shown, the overall magnetic field distribution of the winding when the current is the amplitude, after completing the magnetic field calculation, the stray loss of the shell and internal structural parts The calculation results are shown in Table 1 below. The total loss is 26.162 kW.
[0085] Table 1 Calculation results of shell and internal structural parts losses
[0086] The UHV reactor winding is divided into 4 turns from the inside to the outside, each turn contains 142 wires. Figure 6 The figure shows the transverse leakage magnetic field distribution of each coil in the first coil of the UHV reactor; please refer to Figure 7 As shown in Figure 1, the lateral eddy current loss distribution of each coil in the first coil of the UHV reactor is shown in Figure 2.
[0087] Furthermore, the distribution of the unit transverse eddy current loss, unit longitudinal eddy current loss, and total eddy current loss of the four-layer coil of the UHV reactor is shown in Table 2 below, so the total loss of the winding eddy current loss is 30.230 kW.
[0088] Table 2 Distribution of transverse eddy current loss, longitudinal eddy current loss, and total eddy current loss of a four-layer UHV reactor
[0089] Combined with the rated current I and the operating DC resistance R of the reactor under rated conditions, where I2R is the resistance loss of the winding, the DC resistance loss of the reactor is calculated to be 276.5 kW.
[0090] Therefore, the winding copper loss of the reactor is equal to the sum of the total loss of the winding eddy current loss and the DC resistance loss value, that is, the winding copper loss The value is: 306.73 kW.
[0091] The total loss of the UHV reactor under rated operating conditions can be directly measured by the reactor loss test. The total loss value of the reactor is is: 455.2kW.
[0092] Summarizing the total loss measurement value, copper loss calculation value and stray loss calculation value, the reactor core loss value required to be calculated in this specific embodiment is is: 122.31 kW.
[0093] According to the second aspect of the present application, this embodiment provides a UHV reactor loss acquisition system based on electromagnetic field, such as Figure 8 Shown, including: A first acquisition module is used to obtain the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor; The second acquisition module is used to solve the electromagnetic field problem of the UHV reactor based on the finite element method to obtain the stray losses of the reactor casing and internal structural parts; A third acquisition module is used to obtain the winding DC resistance loss and the winding eddy current loss, and to obtain the winding loss by adding the winding DC resistance loss and the winding eddy current loss; The fourth acquisition module is used to obtain the core loss by subtracting the stray loss and the winding loss from the total loss of the ultra-high voltage reactor.
[0094] Specifically, the system embodiment corresponds one-to-one to the above-mentioned method embodiment, and the functions of each module have been described in detail in the corresponding method embodiment, so they will not be repeated here.
[0095] According to the third aspect of the present application, this embodiment provides a computer-readable storage medium on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a processor, the above method is implemented. The present invention may implement all or part of the above-described method processes by instructing related hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When executed by a processor, the computer program may implement the steps of each of the above-described method embodiments. The computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. Computer-readable media may include any entity or device capable of carrying computer program code, recording media, USB flash drives, removable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signals, telecommunications signals, and software distribution media. It should be noted that the content of a computer-readable medium may be appropriately expanded or reduced based on the requirements of legislation and patent practice within a jurisdiction. For example, in some jurisdictions, based on legislation and patent practice, computer-readable media do not include electric carrier signals or telecommunications signals.
[0096] According to a fourth aspect of the present application, this embodiment provides an electronic device, including: one or more processors; The memory is used to store executable instructions of the processor. When the executable instructions are executed by one or more processors, the one or more processors implement the above method.
[0097] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of a computer device, connecting all parts of the entire computer device using various interfaces and circuits.
[0098] The memory can be used to store computer programs and / or modules. The processor implements the various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (e.g., a sound playback function, an image playback function, etc.); the data storage area may store data generated based on the use of the mobile phone (e.g., audio data, video data, etc.). Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a SmartMedia Card (SMC), a Secure Digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.
[0099] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, servers, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage) containing computer-usable program code.
[0100] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), servers, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0101] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.
[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.
[0103] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.
Claims
1. A method for obtaining UHV reactor loss based on electromagnetic field, characterized in that: include: Obtaining the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor; Solve the electromagnetic field problem of the UHV reactor based on the finite element method to obtain the stray losses of the reactor casing and internal structural components; Obtaining a winding DC resistance loss and a winding eddy current loss, and adding the winding DC resistance loss and the winding eddy current loss to obtain a winding loss; The core loss is obtained by subtracting the stray loss and the winding loss from the total loss of the ultra-high voltage reactor.
2. The method according to claim 1, wherein The obtaining of the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor specifically includes: Under the rated operating conditions of the UHV reactor, the total loss of the UHV reactor is measured through a reactor loss test.
3. The method according to claim 1, wherein The finite element method is used to solve the electromagnetic field problem of the UHV reactor and obtain the stray loss, specifically including: The electromagnetic field problem of the UHV reactor is converted into the solution of Maxwell's equations, which can be expressed as: in, is the magnetic field strength; is the current density; is the electric flux density; is the electric field strength; is the magnetic flux density; is the charge density; The parameters of the Maxwell equations are constrained based on the constitutive equations, and the calculation formula is: in, is the magnetic permeability of the field medium; is the conductivity of the field medium; is the dielectric constant of the field medium; The mathematical model of the eddy current field is established, and the calculation formula is: in, is the vector magnetic potential; is the scalar potential; Introducing the Coulomb gauge and ignoring the influence of displacement current, the complete description of the electromagnetic field problem in the eddy current region and the non-eddy current region of the conductor is as follows: in, It is the eddy current region, in which there is a conductive medium but no passive current; is the non-eddy current region, which contains the given source current, source current density Not 0; numerically solving the Maxwell equations; An electromagnetic field simulation analysis model of a UHV reactor is established in finite element software. The model includes the reactor housing and internal structural components. Based on the solved Maxwell equations, the finite element method is used to extract the stray loss of each finite element unit in the reactor housing and internal structural components. The stray loss in the reactor housing and internal structural components is calculated using the following formula: in, It is The conductivity of each finite element; It is The eddy current density vector of each finite element; It is The conjugate eddy current density vector of each finite element; It is The volume of a finite element; is the number of elements in the overall meshing unit of the steel plate, Represents a real number.
4. The method according to claim 3, wherein: The finite element method is an edge element method.
5. The method according to claim 1, wherein The calculation formula for obtaining the DC resistance loss of the winding is: ； in, is the winding current; is the DC resistance of the winding.
6. The method according to claim 1, wherein The method for obtaining the winding eddy current loss specifically includes: Divide the winding into several coils; The unit transverse eddy current loss and unit longitudinal eddy current loss in the volume formed by each coil along the circumference are obtained and expressed as: Unit transverse eddy current loss: in, For the The distance from the center of gravity of each coil to the center line of the core; For the The area occupied by the conductor in each coil; is the angular frequency; is the width of the wire size; For the Transverse magnetic flux density within each coil; is the resistivity of the material; Unit longitudinal eddy current loss: in, is the height of the wire size; Adding the unit longitudinal eddy current loss and the unit longitudinal eddy current loss to obtain a unit winding loss; The winding losses are obtained by summing up all the unit winding losses.
7. The method according to claim 1, wherein The core loss can be decomposed into core hysteresis loss, core eddy current loss and core additional loss, and the calculation formula is: in, is the core loss, is the core hysteresis loss; is the core eddy current loss; is the additional loss of the core; is the frequency, Hz; is the maximum value of the core magnetic flux density; 、 、 and is a constant that is independent of frequency.
8. A UHV reactor loss acquisition system based on electromagnetic field, characterized in that: include: A first acquisition module is used to obtain the total loss of the UHV reactor based on the rated operating conditions of the UHV reactor; The second acquisition module is used to solve the electromagnetic field problem of the UHV reactor based on the finite element method to obtain the stray losses of the reactor casing and internal structural parts; a third acquisition module, configured to acquire a winding DC resistance loss and a winding eddy current loss, and obtain a winding loss by adding the winding DC resistance loss and the winding eddy current loss; The fourth acquisition module is used to subtract the stray loss and the winding loss from the total loss of the ultra-high voltage reactor to obtain the core loss.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer program includes executable instructions, and when the executable instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.
10. An electronic device, characterized in that: include: one or more processors; A memory for storing executable instructions of the processor, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 7.