Method and device for determining installation position of current sensor in ac-dc screen branch

Abstract

The application discloses a method and device for determining the installation position of a current sensor in an AC / DC screen branch. The method comprises creating an electromagnetic field model of the AC / DC screen branch in electromagnetic field simulation software and setting branch parameters, wherein the AC / DC screen branch comprises an input branch, and the branch parameters comprise input branch parameters; simulating the AC / DC screen branch by using the electromagnetic field model to determine the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC / DC screen branch; and determining the target installation position of the current sensor according to the simulated current density and / or simulated electromagnetic field intensity corresponding to the at least two installation positions. The technical scheme of the application can make the installation position of the current sensor more accurate, can reduce the measurement error of the current parameter in the AC / DC screen branch, and improve the monitoring precision, which is crucial for ensuring the reliability, safety and efficiency of a power system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and in particular to a method and device for determining installation positions of current sensors in AC / DC screen branches. BACKGROUND

[0002] The current sensor of the AC / DC screen branch is used to monitor the current and voltage parameters of the AC / DC screen branch in the power system, so as to ensure the safe operation of the system. Through real-time monitoring, potential faults or abnormal conditions can be found in time, so that corresponding measures can be taken.

[0003] The current sensor used in the prior art is an electromagnetic transformer. The electromagnetic transformer has a primary winding and a secondary winding wound on a magnetic core. Through electromagnetic conversion, the current flowing through the primary winding and the current flowing through the secondary winding have a certain relationship, so that the load current of the primary winding can be indirectly measured by measuring the current of the secondary winding. The main forms of the electromagnetic transformer include a traditional transformer, a Hall open-loop type, and a Hall closed-loop type.

[0004] However, the accuracy of the current parameters measured by the current sensor in the prior art is not high. SUMMARY

[0005] The present application provides a method and device for determining installation positions of current sensors in AC / DC screen branches, so as to solve the problem of low accuracy of current parameters measured by the current sensor.

[0006] According to an aspect of the present application, a method for determining installation positions of current sensors in AC / DC screen branches is provided, which comprises: creating an electromagnetic field model of the AC / DC screen branch and setting branch parameters in an electromagnetic field simulation software, wherein the AC / DC screen branch comprises an input branch, and the branch parameters comprise input branch parameters;

[0007] The electromagnetic field model is used to simulate the AC / DC screen branch, so as to determine the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC / DC screen branch.

[0008] The target installation position of the current sensor is determined according to the simulated current density and / or simulated electromagnetic field intensity corresponding to at least two installation positions.

[0009] Optionally, the target installation position of the current sensor is determined according to the simulated current density and / or simulated electromagnetic field intensity corresponding to at least two installation positions, which comprises:

[0010] The installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field strength among the at least two installation positions is determined as the target installation position.

[0011] Optionally, the determining the target installation position of the current sensor according to the simulated current density and / or the simulated electromagnetic field strength corresponding to the at least two installation positions comprises: determining, as the target installation position, an installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field strength among installation positions capable of accommodating the current sensor of the preset size among the at least two installation positions.

[0012] Optionally, the creating an electromagnetic field model of the AC / DC screen branch in the electromagnetic field simulation software and setting a branch parameter comprises: creating a simulation project and selecting an electromagnetic field module in the electromagnetic field simulation software, creating a geometric model of the AC / DC screen branch, setting material properties of elements in the geometric model, and setting the branch parameter; performing mesh division on the geometric model, and selecting a solver and setting parameters of the solver to obtain the electromagnetic field model.

[0013] Optionally, the simulating and analyzing the AC / DC screen branch by using the electromagnetic field model to determine simulated current densities and simulated electromagnetic field strengths corresponding to at least two installation positions of the current sensor in the AC / DC screen branch comprises: running the electromagnetic field model to generate an electromagnetic field distribution map, the electromagnetic field distribution map displaying strengths and directions of magnetic fields and strengths and directions of electric fields; and extracting magnetic field and electric field distributions of the at least two installation positions to determine the simulated current densities and the simulated electromagnetic field strengths at the at least two installation positions.

[0014] Optionally, after the determining the target installation position of the current sensor according to the simulated current density and / or the simulated electromagnetic field strength corresponding to the at least two installation positions, the method further comprises: obtaining actual current densities and / or actual electromagnetic field strengths according to the installation of the current sensor at the target installation position in the AC / DC screen branch; and adjusting the target installation position according to differences between the actual current densities and the simulated current densities and / or differences between the actual electromagnetic field strengths and the simulated electromagnetic field strengths.

[0015] Optionally, the adjusting the target installation position according to the difference between the actual current density and the simulated current density, and / or the difference between the actual electromagnetic field intensity and the simulated electromagnetic field intensity comprises: determining a first difference percentage according to a ratio of the difference between the simulated current density and the actual current density to the simulated current density; determining a second difference percentage according to a ratio of the difference between the simulated electromagnetic field intensity and the actual electromagnetic field intensity to the simulated electromagnetic field intensity; if the first difference percentage is greater than or equal to a first preset percentage threshold, and / or if the second difference percentage is greater than or equal to a second preset percentage threshold, adjusting a parameter of the input branch, and returning to perform the simulation and emulation of the AC-DC screen branch by using the electromagnetic field model to determine the simulated current density and the simulated electromagnetic field intensity corresponding to the at least two installation positions of the current sensor in the AC-DC screen branch.

[0016] Optionally, after the target installation position of the current sensor is determined according to the simulated current density and / or the simulated electromagnetic field intensity corresponding to the at least two installation positions, the method further comprises: installing the current sensor at the target installation position of the AC-DC screen branch; performing electromagnetic compatibility testing and system integrity verification; the electromagnetic compatibility testing comprises testing the AC-DC screen branch and the current sensor by using a radiated electromagnetic field test method; the system integrity verification comprises data transmission testing of the current sensor and circuit connection state testing of the AC-DC screen branch.

[0017] Optionally, the branch parameter comprises a line length, a wire specification, a current size and a frequency of the input branch.

[0018] According to another aspect of the present application, there is provided a device for determining an installation position of a current sensor in an AC-DC screen branch, the device comprising:

[0019] a branch parameter setting module configured to create an electromagnetic field model of the AC-DC screen branch in electromagnetic field simulation software and set a branch parameter, wherein the AC-DC screen branch comprises an input branch, and the branch parameter comprises an input branch parameter;

[0020] an electromagnetic field simulation module configured to perform simulation and emulation of the AC-DC screen branch by using the electromagnetic field model to determine simulated current densities and simulated electromagnetic field intensities corresponding to at least two installation positions of the current sensor in the AC-DC screen branch;

[0021] a sensor position determining module configured to determine a target installation position of the current sensor according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to the at least two installation positions.

[0022] The technical scheme of the embodiment of the present application creates an electromagnetic field model of an AC-DC screen branch and sets branch parameters in the electromagnetic field simulation software, wherein the AC-DC screen branch includes an input branch, and the branch parameters include input branch parameters; the electromagnetic field model is used to simulate the AC-DC screen branch, to determine simulated current densities and simulated electromagnetic field intensities corresponding to at least two installation positions of a current sensor in the AC-DC screen branch; and the target installation position of the current sensor is determined according to the simulated current densities and / or simulated electromagnetic field intensities corresponding to the at least two installation positions. The technical scheme of the embodiment of the present application can make the installation position of the current sensor more accurate, can reduce the measurement error of the current parameters in the AC-DC screen branch, and can improve the monitoring precision, which is crucial for ensuring the reliability, safety and efficiency of a power system.

[0023] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 A flow chart of a method for determining the installation position of a current sensor in an AC-DC screen branch according to the first embodiment of the present application is shown in FIG. 1;

[0026] Figure 2 A flow chart of another method for determining the installation position of a current sensor in an AC-DC screen branch according to the second embodiment of the present application is shown in FIG. 2;

[0027] Figure 3 A flow chart of a method for determining the installation position of a current sensor in an AC-DC screen branch according to the third embodiment of the present application is shown in FIG. 3;

[0028] Figure 4 A flow chart of a method for determining the installation position of a current sensor in an AC-DC screen branch according to the fourth embodiment of the present application is shown in FIG. 4;

[0029] Figure 5 A flow chart of a method for determining the installation position of a current sensor in an AC-DC screen branch according to the fifth embodiment of the present application is shown in FIG. 5;

[0030] Figure 6A flow chart of a method for determining the installation position of a current sensor in a branch of an AC / DC screen according to the sixth embodiment of the present application is provided.

[0031] Figure 7 A structural schematic diagram of a device for determining the installation position of a current sensor in a branch of an AC / DC screen according to the seventh embodiment of the present application is provided. DETAILED DESCRIPTION

[0032] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0034] Embodiment one

[0035] Figure 1 A flow chart of a method for determining the installation position of a current sensor in a branch of an AC / DC screen according to the first embodiment of the present application is provided. The present embodiment can be applicable to power system monitoring and control, fault diagnosis and prevention, etc. The method can be executed by a device for determining the installation position of a current sensor in a branch of an AC / DC screen. The device can be realized in the form of hardware and / or software, and can be configured in a branch of an AC / DC screen. As shown in the figure, the method comprises: Figure 1

[0036] S101, creating an electromagnetic field model of the AC / DC screen branch in the electromagnetic field simulation software and setting the branch parameters, wherein the AC / DC screen branch includes an input branch, and the branch parameters include input branch parameters.

[0037] ​The electromagnetic field simulation software can be simulation software capable of simulating the interaction of multiple physical phenomena such as electromagnetic fields, heat transfer, fluid flow, structural mechanics, etc. The electromagnetic field model of the AC / DC screen branch can be a model of the electromagnetic field generated by the AC / DC screen branch during operation, wherein the modeling includes but is not limited to mathematical modeling. The AC / DC screen branch includes an input branch, and the branch parameters include input branch parameters. Optionally, the input branch parameters include the line length, wire specification, current size, and frequency of the input branch. For example, the line length of the input branch of the AC / DC screen branch can be 1000m, the wire specification can be 2.5mm 2 , the current size can include a first load of 200A, a second load of 150A, and a third load of 250A, and the frequency can be 50Hz.

[0038] S102, simulate the AC / DC screen branch using the electromagnetic field model to determine the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC / DC screen branch.

[0039] The current sensor is a device for measuring current, which can convert current signals into signals that are easy to measure and analyze, such as voltage and digital signals, etc. The at least two installation positions refer to two or more installation positions, and the optimal installation position can be determined among the at least two installation positions. The simulated current density generally refers to the prediction of the current density distribution in a certain area through numerical calculation or modeling in a computer simulation or simulation environment. In this embodiment, the simulated current density is the current density obtained by simulating the AC / DC screen branch using the electromagnetic field model. The current density is a physical quantity that describes the strength of the current at a certain point in the circuit, and its size is equal to the amount of electricity passing through a unit area per unit time. The electromagnetic field intensity refers to the force experienced by a unit charge or a unit current in an electric field or a magnetic field at a given point. In this embodiment, the simulated electromagnetic field intensity is the electromagnetic field intensity obtained by simulating the AC / DC screen branch using the electromagnetic field model. The simulated current density and simulated electromagnetic field intensity corresponding to the at least two installation positions of the AC / DC screen branch are used to determine the position of the current sensor in the subsequent steps.

[0040] S103, determining the target installation position of the current sensor according to the simulated current density and / or simulated electromagnetic field intensity corresponding to the at least two installation positions.

[0041] The target installation position of the current sensor can be determined by comparing the simulated current densities corresponding to the at least two installation positions, and / or by comparing the simulated electromagnetic field strengths corresponding to the at least two installation positions, and then determining the installation position that can meet a smaller current measurement error in the at least two installation positions as the target installation position. Specifically, the greater the current density at the installation position, the smaller the measurement error; the smaller the current density at the installation position, the greater the measurement error. Optionally, at least one installation position that meets at least one of the conditions that the simulated current density is greater than a current density threshold and / or the simulated electromagnetic field strength is greater than an electromagnetic field strength threshold is determined as the target installation position. The at least two installation positions can be set in advance, and the target installation position can be accurately determined by comparing the simulated current densities and / or simulated electromagnetic field strengths corresponding to the at least two installation positions set in advance, so that the target installation position determined has a smaller current measurement error, and the accuracy of current measurement is improved.

[0042] The embodiment of the present application determines the simulated current densities and / or simulated electromagnetic field strengths corresponding to the at least two installation positions of the current sensor in the AC / DC screen branch by creating an electromagnetic field model of the AC / DC screen branch in electromagnetic field simulation software and setting branch parameters, and simulating and determining the installation position of the current sensor. The technical solution of the present application can make the installation position of the current sensor more accurate, can reduce the measurement error of the current parameters in the AC / DC screen branch, and improve the monitoring accuracy, which is crucial for ensuring the reliability, safety and efficiency of the power system.

[0043] Embodiment two

[0044] Figure 2 Another flowchart of the method for determining the installation position of the current sensor in the AC / DC screen branch provided by the second embodiment of the present application is shown in Figure 1 and Figure 2 This embodiment is based on the first embodiment, and S103, determining the target installation position of the current sensor according to the simulated current densities and / or simulated electromagnetic field strengths corresponding to the at least two installation positions, is refined to S203, determining the installation position corresponding to the maximum simulated current density and / or the installation position corresponding to the maximum simulated electromagnetic field strength in the at least two installation positions as the target installation position. As shown in Figure 2 , the method comprises:

[0045] S201, creating an electromagnetic field model of the AC / DC screen branch in electromagnetic field simulation software and setting branch parameters, wherein the AC / DC screen branch comprises an input branch, and the branch parameters comprise input branch parameters.

[0046] S202, simulate the AC / DC screen branch by using an electromagnetic field model to determine the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC / DC screen branch.

[0047] S203, determine the installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity among the at least two installation positions as the target installation position.

[0048] The maximum simulated current density corresponds to a high current density and a concentrated current. Installing a sensor in the area with the highest current density can obtain the maximum amount of current change in the system and provide more accurate measurement results. The electromagnetic field intensity usually reaches the maximum in the area with the highest current density. In the area with the maximum simulated current density and / or the maximum simulated electromagnetic field intensity, the current flow is most concentrated and the electromagnetic effect is most significant. Therefore, installing a sensor can accurately measure the current in these areas to better understand the current distribution and electromagnetic environment. At the same time, it is avoided to install a current sensor near an electromagnetic interference source and / or in an area where conductors cross, because the current distribution is uneven near the electromagnetic interference source and the current is superimposed in the area where conductors cross.

[0049] For example, the at least two installation positions include position 1, position 2, position 3, and position 4. The current density at position 1 is 90 A / cm 2 , the electromagnetic field intensity is 1.2 T, the power consumption is 1 W, and the installation stability is good; the current density at position 2 is 80 A / cm 2 , the electromagnetic field intensity is 1.1 T, the power consumption is 1 W, and the installation stability is good; the current density at position 3 is 110 A / cm 2 , the electromagnetic field intensity is 1.3 T, the power consumption is 1 W, and the installation stability is good; the current density at position 4 is 70 A / cm 2 , the electromagnetic field intensity is 1.0 T, the power consumption is 1 W, and the installation stability is good; by comparing the current densities of the four positions, the current density at position 3 is the highest, which is 110 A / cm 2 , and therefore it is the best installation position; by comparing the electromagnetic field intensities of the four positions, the electromagnetic field intensity at position 3 is the highest, which is 1.3 T, and therefore it is the best installation position.

[0050] In some optional embodiments of the present application, determining the target installation position of the current sensor according to the simulated current density and / or the simulated electromagnetic field intensity corresponding to the at least two installation positions includes: determining, as the target installation position, the installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity among the installation positions in the at least two installation positions that can accommodate a current sensor with a preset size.

[0051] Specifically, in the actual application scene of the AC-DC screen branch, the installation space of the current sensor is limited. The electromagnetic transformer used in the prior art has the disadvantages of large size, complex insulation structure, high cost, magnetic saturation, ferromagnetic resonance, small dynamic range, etc. In the present application, the current sensor is a high-frequency current sensor, the size of the sensor is not more than the space limitation of the installation position, for example, the size of the sensor can be not more than 5cm x 5cm, the power consumption is controlled within the range of 1W, and the installation mode adopts fixed installation mode. In this way, the size of the current transformer is small, and it can be set in a relatively narrow space.

[0052] The embodiment of the present application creates an electromagnetic field model of the AC-DC screen branch in the electromagnetic field simulation software and sets the branch parameters, performs simulation and simulation, determines the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC-DC screen branch, determines the installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity as the installation position of the current sensor. Install the current sensor at the maximum simulated current density and / or the maximum simulated electromagnetic field intensity, so as to better understand the current distribution and electromagnetic environment, ensure the integrity and performance of the entire system, and further ensure the accuracy of the current parameters measured by the current sensor after installing the current sensor at the target installation position.

[0053] Embodiment three

[0054] Figure 3 Another flowchart of the method for determining the installation position of the current sensor in the AC-DC screen branch provided by the third embodiment of the present application is shown in Figure 1 and Figure 3 This embodiment is based on the first embodiment, and S101, an electromagnetic field model of the AC-DC screen branch is created in the electromagnetic field simulation software and the branch parameters are set, wherein the AC-DC screen branch includes an input branch, and the branch parameters include the input branch parameters. Further refined as S3011, create a simulation project in the electromagnetic field simulation software and select an electromagnetic field module, create a geometric model of the AC-DC screen branch, set the material properties of the elements in the geometric model, and set the branch parameters. S3012 divides the geometric model into meshes, selects a solver and sets the parameters of the solver to obtain an electromagnetic field model. As Figure 3 shown, the method comprises:

[0055] S3011, create a simulation project in the electromagnetic field simulation software and select an electromagnetic field module, create a geometric model of the AC-DC screen branch, set the material properties of the elements in the geometric model, and set the branch parameters.

[0056] The geometric model is a mathematical model describing the physical shape and size of the research object and is the basis for electromagnetic field analysis. The geometric model is a component of the electromagnetic field model. The material properties of the elements in the geometric model are key parameters in the simulation and analysis process. For example, creating a geometric model of the AC-DC screen branch can include opening the electromagnetic field simulation software and creating a new simulation project; selecting the electromagnetic field module in the left menu of the software, selecting 'physics' -> 'electromagnetic' ->'static' or 'dynamic'; creating a geometric model of the AC-DC screen branch in the electromagnetic field simulation software geometric modeling environment, including creating conductors, sensors; setting the material properties of the conductors, such as resistivity and permeability, which will affect the distribution of the electromagnetic field; setting the boundary conditions, setting the position and size of the current source to simulate the actual current distribution, and setting other boundary conditions, such as the ground connection of the conductor ends.

[0057] S3012, meshing the geometric model, and selecting a solver and setting parameters of the solver to obtain an electromagnetic field model.

[0058] The geometric model is meshed to accurately capture the details of the electromagnetic field so that the numerical solver can perform calculations. The density and quality of the mesh directly affect the accuracy and computation time of the simulation. For example, the solution settings can be to select a frequency domain solver to calculate the electromagnetic field, and to set parameters of the solver, such as the frequency range.

[0059] S302, simulating the AC-DC screen branch using the electromagnetic field model to determine the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC-DC screen branch.

[0060] S303, determining the target installation position of the current sensor according to the simulated current density and / or simulated electromagnetic field intensity corresponding to the at least two installation positions.

[0061] The embodiment of the present application creates a simulation project in the electromagnetic field simulation software and selects an electromagnetic field module to create a geometric model of the AC-DC screen branch, sets the material properties of the elements in the geometric model, and sets the branch parameters. The geometric model is meshed, and a solver is selected and the parameters of the solver are set to obtain an electromagnetic field model. The geometric model is meshed, making numerical calculation and analysis easier, the simulation results more accurate, and improving the calculation efficiency and speed.

[0062] Embodiment four

[0063] Figure 4 A flowchart of a method for determining the installation position of a current sensor in an AC-DC screen branch according to the fourth embodiment of the present application is shown in FIG. 4. Figure 1 and Figure 4The embodiment is based on embodiment one, S102, and uses an electromagnetic field model to simulate the AC / DC screen branch to determine the simulated current density and simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC / DC screen branch. It is refined as S4021, running the electromagnetic field model to generate an electromagnetic field distribution map, and the electromagnetic field distribution map shows the strength and direction of the magnetic field and the strength and direction of the electric field. S4022, extracting the magnetic field and electric field distribution of at least two installation positions to determine the simulated current density and simulated electromagnetic field intensity at the at least two installation positions. As shown in Figure 4 The method comprises:

[0064] S401, creating an electromagnetic field model of the AC / DC screen branch in the electromagnetic field simulation software and setting the branch parameters, wherein the AC / DC screen branch includes an input branch, and the branch parameters include input branch parameters.

[0065] S4021, running the electromagnetic field model to generate an electromagnetic field distribution map, and the electromagnetic field distribution map shows the strength and direction of the magnetic field and the strength and direction of the electric field.

[0066] Wherein, running the electromagnetic field model, the electromagnetic field simulation software will calculate the distribution of the electromagnetic field in the conductor, and during the simulation process, the software will generate a distribution map of the electromagnetic field, showing the strength and direction of the magnetic field and the electric field.

[0067] S4022, extracting the magnetic field and electric field distribution of at least two installation positions to determine the simulated current density and simulated electromagnetic field intensity at the at least two installation positions.

[0068] Wherein, extracting the strength and distribution of the electromagnetic field at the sensor installation position, analyzing the electromagnetic field strength to ensure that the sensor can accurately measure the required electromagnetic field parameters. According to the magnetic field and electric field distribution of at least two installation positions obtained by simulating the AC / DC screen branch, the corresponding simulated current density and simulated electromagnetic field intensity are determined.

[0069] S403, determining the target installation position of the current sensor according to the simulated current density and / or simulated electromagnetic field intensity corresponding to at least two installation positions.

[0070] The embodiment of the application generates an electromagnetic field distribution map by running the electromagnetic field model, and the electromagnetic field distribution map shows the strength and direction of the magnetic field and the strength and direction of the electric field, obtains the magnetic field and electric field distribution of at least two installation positions, determines the simulated current density and simulated electromagnetic field intensity at the at least two installation positions, and determines the installation position of the current sensor. The electromagnetic field simulation software generates a distribution map of the electromagnetic field, showing the strength and direction of the magnetic field and the electric field, which can intuitively understand the distribution of the electric field and the magnetic field in space, and help analyze the concentration or dispersion area of the electromagnetic field.

[0071] Embodiment five

[0072] Figure 5 is a flowchart of a method for determining the installation position of a current sensor in a branch of an AC / DC panel according to an embodiment of the present application. With reference to Figure 1 and Figure 5 , this embodiment is based on the above-mentioned embodiments, and after S103, determining the target installation position of the current sensor according to the simulated current density and / or simulated electromagnetic field strength corresponding to the at least two installation positions, S504 is added, obtaining the actual current density and / or actual electromagnetic field strength by installing the current sensor at the target installation position in the AC / DC branch. S505 adjusts the target installation position according to the difference between the actual current density and the simulated current density, and / or the difference between the actual electromagnetic field strength and the simulated electromagnetic field strength. As Figure 5 shown, the method comprises:

[0073] S501, creating an electromagnetic field model of the AC / DC panel branch in the electromagnetic field simulation software and setting the branch parameters, wherein the AC / DC panel branch includes an input branch, and the branch parameters include the input branch parameters.

[0074] S5021, running the electromagnetic field model to generate an electromagnetic field distribution map, which shows the strength and direction of the magnetic field, as well as the strength and direction of the electric field.

[0075] S5022, extracting the magnetic field and electric field distribution of the at least two installation positions to determine the simulated current density and simulated electromagnetic field strength at the at least two installation positions.

[0076] S503, determining the target installation position of the current sensor according to the simulated current density and / or simulated electromagnetic field strength corresponding to the at least two installation positions.

[0077] S504, obtaining the actual current density and / or actual electromagnetic field strength by installing the current sensor at the target installation position in the AC / DC branch.

[0078] Wherein, the actual current density is obtained by dividing the current measured by the current sensor passing through the branch by the impedance of the conductor. The actual electromagnetic field strength calculation formula is: B = μ0*I / (2πr), where B is the magnetic induction intensity, μ0 is the vacuum permeability, I is the current, and r is the distance between the sensor installation position and the center of the conductor. For example, the conductor specification is 2.5mm 2 , the actual measured current is 200A, the frequency is 50Hz, the vacuum permeability μ0 is 4π×10^-7T·m / A, the distance between the sensor installation position and the center of the conductor is 5cm, the resistivity of the conductor is 1.72×10^-8Ω·m, the permeability is 1.26×10^-6H / m, and the preset impedance of the conductor is 0.1Ω. The current density is calculated to be 2000A / cm2 The electromagnetic field strength is 0.008T.

[0079] S505, adjusting the target installation position according to the difference between the actual current density and the simulated current density, and / or the difference between the actual electromagnetic field strength and the simulated electromagnetic field strength.

[0080] The difference between the actual current density and the simulated current density and / or the difference between the actual electromagnetic field strength and the simulated electromagnetic field strength is compared. If the difference is too large, the installation position needs to be adjusted. If the difference is not large, the installation position does not need to be adjusted.

[0081] In some optional embodiments of the present application, adjusting the target installation position according to the difference between the actual current density and the simulated current density, and / or the difference between the actual electromagnetic field strength and the simulated electromagnetic field strength, comprises: determining a first difference percentage according to the ratio of the difference between the simulated current density and the actual current density to the simulated current density; determining a second difference percentage according to the ratio of the difference between the simulated electromagnetic field strength and the actual electromagnetic field strength to the simulated electromagnetic field strength; if the first difference percentage is greater than or equal to a first preset percentage threshold, and / or if the second difference percentage is greater than or equal to a second preset percentage threshold, adjusting the parameters of the input branch, and returning to perform simulation and simulation of the AC / DC screen branch using the electromagnetic field model to determine the simulated current density and the simulated electromagnetic field strength corresponding to the at least two installation positions of the current sensor in the AC / DC screen branch.

[0082] The first difference percentage refers to the difference percentage of the simulated current density and the actual current density. The second difference percentage refers to the difference percentage of the simulated electromagnetic field strength and the actual electromagnetic field strength. The first preset percentage threshold refers to the preset difference percentage threshold of the simulated current density and the actual current density. The second preset percentage threshold refers to the preset difference percentage threshold of the simulated electromagnetic field strength and the actual electromagnetic field strength. When the first difference percentage and / or the second difference percentage exceeds the corresponding preset threshold, the simulation needs to be performed again to determine the simulated current density and the simulated electromagnetic field strength corresponding to the at least two installation positions of the current sensor in the AC / DC screen branch.

[0083] For example, the first preset percentage threshold and / or the second preset percentage threshold can be set to 5%, and the current density predicted by the simulation result is 215A / cm 2 and the actual measurement result is 205A / cm 2, the first difference percentage = |(215-205) / 215|*100% = 4.878%, indicating that the difference between the simulation result and the actual measurement result is 4.878%; it is considered that the simulation result is highly consistent with the actual measurement result. When the first difference percentage is greater than or equal to 5% and / or the second difference percentage is greater than or equal to 5%, the parameters of the input branch need to be adjusted, and the simulation and simulation of the AC-DC screen branch by using the electromagnetic field model are performed again to determine the simulated current density and the simulated electromagnetic field density corresponding to the at least two installation positions respectively.

[0084] The embodiment of the application adjusts the target installation position by comparing the difference between the actual current density and the simulated current density and / or the difference between the actual electromagnetic field strength and the simulated electromagnetic field strength. When the difference is large, the parameters can be adjusted in time, and the simulation is performed again, so that the installation position is more accurate, thereby improving the accuracy of the current parameters measured by the current sensor.

[0085] Embodiment six

[0086] Figure 6 is a flowchart of a method for determining the installation position of a current sensor in an AC-DC screen branch provided by the sixth embodiment of the application, referring to Figure 1 and Figure 6 , this embodiment is based on the above-mentioned embodiments, after S103, determining the target installation position of the current sensor according to the simulated current density and / or the simulated electromagnetic field strength corresponding to the at least two installation positions, S604 is added, installing the current sensor at the target installation position of the AC-DC screen branch. S605, electromagnetic compatibility test and system integrity verification; the electromagnetic compatibility test includes testing the AC-DC screen branch and the current sensor by using the radiation electromagnetic field test method; the system integrity verification includes data transmission test of the current sensor and circuit connection state test of the AC-DC screen branch.

[0087] S601, creating an electromagnetic field model of the AC-DC screen branch in the electromagnetic field simulation software and setting the branch parameters, wherein the AC-DC screen branch includes an input branch, and the branch parameters include the input branch parameters.

[0088] S602, simulating and simulating the AC-DC screen branch by using the electromagnetic field model to determine the simulated current density and the simulated electromagnetic field strength corresponding to the at least two installation positions of the current sensor in the AC-DC screen branch.

[0089] S603, determining the target installation position of the current sensor according to the simulated current density and / or the simulated electromagnetic field strength corresponding to the at least two installation positions.

[0090] S604, install the current sensor at the target installation position of the AC / DC screen branch.

[0091] The installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field strength is determined as the target installation position, and the current sensor is installed at the target installation position.

[0092] S605, perform electromagnetic compatibility testing and system integrity verification; the electromagnetic compatibility testing includes testing the AC / DC screen branch and the current sensor by using a radiated electromagnetic field test method; the system integrity verification includes data transmission testing of the current sensor and circuit connection state testing of the AC / DC screen branch.

[0093] The electromagnetic compatibility testing is to ensure that the electronic device can work normally in an electromagnetic environment without interfering with other devices. The electromagnetic compatibility testing includes using a radiated electromagnetic field test method, which is mainly used to measure and evaluate the electromagnetic field strength generated by electronic devices or other radiation sources at different frequencies. The system integrity verification is to ensure the stability and performance of the system, and to verify the stable connection and data transmission of the sensor and the circuit.

[0094] The embodiment of the application determines the simulated current density and the simulated electromagnetic field strength at at least two installation positions by simulating the electromagnetic field model, installs the current sensor at the target installation position of the AC / DC screen branch, and performs electromagnetic compatibility testing and system integrity verification. After installing the current sensor, it is ensured that the system does not generate or receive electromagnetic interference and that the sensor and the circuit are stably connected and data transmission is ensured. The reliability, safety and stability of the system can be effectively improved, and long-term normal operation of the system in various environments is ensured.

[0095] Embodiment seven

[0096] Figure 7 is a structural schematic diagram of a device for determining the installation position of a current sensor in an AC / DC screen branch provided by the seventh embodiment of the application. As shown in Figure 7 The device comprises:

[0097] The branch parameter setting module 701 is configured to create an electromagnetic field model of the AC / DC screen branch in the electromagnetic field simulation software and set the branch parameters, wherein the AC / DC screen branch comprises an input branch, and the branch parameters comprise input branch parameters.

[0098] The electromagnetic field simulation module 702 simulates the AC / DC screen branch by using the electromagnetic field model to determine the simulated current density and the simulated electromagnetic field strength corresponding to at least two installation positions of the current sensor in the AC / DC screen branch.

[0099] The sensor position determination module 703 is configured to determine the target installation position of the current sensor according to the simulated current density and / or the simulated electromagnetic field intensity corresponding to at least two installation positions.

[0100] Optionally, the sensor position determination module 703 is specifically configured to:

[0101] determine, as the target installation position, the installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity among the at least two installation positions.

[0102] Optionally, the sensor position determination module 703 is further configured to:

[0103] determine, as the target installation position, the installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity among the installation positions capable of accommodating the current sensor of the preset size among the at least two installation positions.

[0104] Optionally, the branch parameter setting module 701 is specifically configured to:

[0105] create a simulation project and select an electromagnetic field module in the electromagnetic field simulation software, create a geometric model of the AC / DC screen branch, set the material properties of the elements in the geometric model, and set the branch parameters.

[0106] perform meshing on the geometric model, and select a solver and set the parameters of the solver to obtain an electromagnetic field model.

[0107] Optionally, the electromagnetic field simulation module 702 is specifically configured to:

[0108] run the electromagnetic field model to generate an electromagnetic field distribution map, and the electromagnetic field distribution map displays the strength and direction of the magnetic field, and the strength and direction of the electric field.

[0109] extract the magnetic field and electric field distribution of at least two installation positions to determine the simulated current density and simulated electromagnetic field intensity at the at least two installation positions.

[0110] Optionally, the device for determining the installation position of the current sensor in the AC / DC screen branch further comprises:

[0111] an actual measurement module configured to obtain actual current density and / or actual electromagnetic field intensity according to the installation of the current sensor at the target installation position in the AC / DC branch.

[0112] a position adjustment module configured to adjust the target installation position according to the difference between the actual current density and the simulated current density, and / or the difference between the actual electromagnetic field intensity and the simulated electromagnetic field intensity.

[0113] Optionally, the position adjustment module is specifically configured to:

[0114] The first difference percentage is determined according to a ratio of a difference between the simulated current density and the actual current density to the simulated current density; and the second difference percentage is determined according to a ratio of a difference between the simulated electromagnetic field intensity and the actual electromagnetic field intensity to the simulated electromagnetic field intensity.

[0115] If the first difference percentage is greater than or equal to a first preset percentage threshold, and / or if the second difference percentage is greater than or equal to a second preset percentage threshold, the parameters of the input branch are adjusted, and the simulation of the AC / DC screen branch using the electromagnetic field model is performed again to determine the simulated current density and the simulated electromagnetic field intensity corresponding to the at least two installation positions of the current sensor in the AC / DC screen branch.

[0116] Optionally, the determination apparatus for the installation positions of the current sensor in the AC / DC screen branch further comprises:

[0117] The installation module is configured to install the current sensor at the target installation position of the AC / DC screen branch.

[0118] The test module is configured to perform electromagnetic compatibility testing and system integrity verification; the electromagnetic compatibility testing comprises testing the AC / DC screen branch and the current sensor using a radiated electromagnetic field test method; and the system integrity verification comprises data transmission testing of the current sensor and circuit connection state testing of the AC / DC screen branch.

[0119] Optionally, the branch parameter setting module 701 is further configured to set the branch parameters to include the line length, the wire specification, the current size, and the frequency of the input branch.

[0120] The determination apparatus for the installation positions of the current sensor in the AC / DC screen branch provided by the embodiments of the present application can perform the method for determining the installation positions of the current sensor in the AC / DC screen branch provided by any of the embodiments of the present application, and has the corresponding function modules and beneficial effects of performing the method.

[0121] It should be understood that the various forms of flow shown above can be reordered, added to, or deleted from. For example, the steps described in the present application can be executed in parallel, in sequence, or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0122] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the installation position of a current sensor in a branch of an AC / DC panel, characterized in that, The method comprises: creating an electromagnetic field model of an AC-DC screen branch in an electromagnetic field simulation software and setting branch parameters, wherein the AC-DC screen branch comprises an input branch, and the branch parameters comprise input branch parameters; performing simulation and modeling on the AC-DC screen branch by using the electromagnetic field model to determine simulated current densities and simulated electromagnetic field intensities corresponding to at least two installation positions of the current sensor in the AC-DC screen branch; determining a target installation position of the current sensor according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to the at least two installation positions; wherein, after the target installation position of the current sensor is determined according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to the at least two installation positions, the method further comprises: obtaining actual current densities and / or actual electromagnetic field intensities according to installation of the current sensor at the target installation position in the AC-DC screen branch; adjusting the target installation position according to differences between the actual current densities and the simulated current densities, and / or differences between the actual electromagnetic field intensities and the simulated electromagnetic field intensities; wherein, the adjusting of the target installation position according to the differences between the actual current densities and the simulated current densities, and / or the differences between the actual electromagnetic field intensities and the simulated electromagnetic field intensities comprises: determining a first difference percentage according to a ratio of a difference value between the simulated current densities and the actual current densities to the simulated current densities, and determining a second difference percentage according to a ratio of a difference value between the simulated electromagnetic field intensities and the actual electromagnetic field intensities to the simulated electromagnetic field intensities; if the first difference percentage is greater than or equal to a first preset percentage threshold, and / or if the second difference percentage is greater than or equal to a second preset percentage threshold, adjusting parameters of the input branch, and returning to perform simulation and modeling on the AC-DC screen branch by using the electromagnetic field model to determine the simulated current densities and the simulated electromagnetic field intensities corresponding to the at least two installation positions of the current sensor in the AC-DC screen branch.

2. The method of claim 1, wherein the current sensor installation position is determined in the AC / DC panel branch. The determining of the target installation position of the current sensor according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to the at least two installation positions comprises: determining, as the target installation position, an installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity among the at least two installation positions.

3. The method of claim 1 or 2, wherein the current sensor installation position is determined in the AC / DC panel branch. The determining of the target installation position of the current sensor according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to the at least two installation positions comprises: determining, as the target installation position, an installation position corresponding to the maximum simulated current density and / or the maximum simulated electromagnetic field intensity among installation positions of the at least two installation positions that can accommodate a current sensor of a preset size.

4. The method of claim 1, wherein the current sensor installation position is determined in the AC / DC panel branch. The creating of the electromagnetic field model of the AC-DC screen branch in the electromagnetic field simulation software and the setting of the branch parameters comprise: In the electromagnetic field simulation software, a simulation project is created and an electromagnetic field module is selected, a geometric model of the AC / DC screen branch is created, material properties of elements in the geometric model are set, and parameters of the branch are set; The geometric model is meshed, a solver is selected, and parameters of the solver are set to obtain the electromagnetic field model.

5. The method for determining the installation position of the current sensor in the branch of the AC / DC screen according to claim 1, characterized in that, The electromagnetic field model is used to simulate and analyze the AC / DC screen branch, and simulated current densities and simulated electromagnetic field intensities corresponding to at least two installation positions of the current sensor in the AC / DC screen branch are determined, which includes: The electromagnetic field model is run to generate an electromagnetic field distribution map, and the electromagnetic field distribution map displays the intensity and direction of the magnetic field and the intensity and direction of the electric field; The magnetic field and the electric field distribution of at least two installation positions are extracted to determine the simulated current densities and the simulated electromagnetic field intensities at the at least two installation positions.

6. The method of claim 1, wherein the current sensor installation position is determined in the AC / DC panel branch. After the target installation position of the current sensor is determined according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to at least two installation positions, the method further includes: The current sensor is installed at the target installation position of the AC / DC screen branch; An electromagnetic compatibility test and a system integrity verification are performed; The electromagnetic compatibility test includes testing the AC / DC screen branch and the current sensor by using a radiated electromagnetic field test method; The system integrity verification includes a data transmission test of the current sensor and a circuit connection state test of the AC / DC screen branch.

7. The method of claim 1, wherein the current sensor installation position is determined in the AC / DC panel branch. The branch parameters include the line length, the wire specification, the current size, and the frequency of the input branch.

8. A device for determining the installation position of a current sensor in a branch of an AC / DC panel, characterized in that it comprises: The device includes: A branch parameter setting module is configured to create an electromagnetic field model of an AC / DC screen branch in electromagnetic field simulation software and set branch parameters, wherein the AC / DC screen branch includes an input branch, and the branch parameters include input branch parameters; An electromagnetic field simulation module is configured to use the electromagnetic field model to simulate and analyze the AC / DC screen branch, and determine simulated current densities and simulated electromagnetic field intensities corresponding to at least two installation positions of a current sensor in the AC / DC screen branch; A sensor position determination module is configured to determine a target installation position of the current sensor according to the simulated current densities and / or the simulated electromagnetic field intensities corresponding to at least two installation positions. The device for determining the installation position of the current sensor in the AC / DC screen branch further includes: An actual measurement module is configured to obtain actual current densities and / or actual electromagnetic field intensities according to the current sensor installed at the target installation position in the AC / DC screen branch; A position adjustment module is configured to adjust the target installation position according to differences between the actual current densities and the simulated current densities, and / or differences between the actual electromagnetic field intensities and the simulated electromagnetic field intensities. The position adjustment module is specifically configured to: Determine a first difference percentage according to a ratio of a difference value between the simulated current densities and the actual current densities to the simulated current densities, and determine a second difference percentage according to a ratio of a difference value between the simulated electromagnetic field intensities and the actual electromagnetic field intensities to the simulated electromagnetic field intensities. If the first difference percentage is greater than or equal to a first preset percentage threshold, and / or if the second difference percentage is greater than or equal to a second preset percentage threshold, the parameters of the input branch are adjusted, and the simulation of the AC / DC screen branch using the electromagnetic field model is performed again to determine the simulated current density and the simulated electromagnetic field intensity corresponding to at least two installation positions of the current sensor in the AC / DC screen branch, respectively.

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