Current measurement method and device based on array current sensor, medium and terminal

Abstract

The invention discloses a current measurement method and device based on an array current sensor, a medium and a terminal, relates to the technical field of current measurement, and mainly aims to solve the problem that a magnetic field generated by a field source located outside a circular array of the array current sensor enters the array current sensor in the prior art. And the measurement accuracy of the array type current sensor is reduced. Comprising the steps of measuring a magnetic induction intensity component of a magnetic field where a target wire is located by using a target array current sensor; based on each sensor element in the target array type current sensor, constructing electromagnetic component expressions corresponding to x, y and z axes corresponding to the sensor element, and based on the electromagnetic component expressions corresponding to the x, y and z axes, constructing an electromagnetic component equation set corresponding to the sensor element; and solving the electromagnetic component equation set based on a least square method to obtain a calculated current value of the target wire.

Description

Technical Field

[0001] The present application relates to the field of current measurement technology, and in particular to a current measurement method and device, medium, and terminal based on an array current sensor. Background Art

[0002] As an important electrical quantity for the safe operation of the power grid, the current value needs to be measured and monitored in the fields of relay protection, power grid monitoring, power analysis and system control, solar power generation, automotive electronics, and aerospace. Therefore, accurate current measurement values ​​are of great significance. Since non-contact current sensors have the advantages of low loss and electrical insulation between the primary and secondary sides, they are widely used in power distribution, power electronics, drive technology, etc., and are one of the most effective means of measuring current values. Among them, since the array current sensor does not contain an iron core in its structure, compared with the current sensor with an iron core, it is not restricted by the inherent properties of the iron core such as DC bias magnetism, hysteresis effect, and easy saturation brought by the iron core material, which greatly improves the linearity and dynamic range of the array current sensor. In addition, it has the advantages of small size, light weight, and low cost, making it the most commonly used current sensor.

[0003] However, since the iron core loses its function of shielding the external magnetic field, the magnetic field generated by the field source outside the circular array of the array current sensor can easily enter the array current sensor, resulting in reduced measurement accuracy of the array current sensor. Summary of the invention

[0004] In view of this, the present application provides a current measurement method and device, medium, and terminal based on an array current sensor. The main purpose is to solve the problem that the measurement accuracy of the array current sensor is reduced due to the magnetic field generated by the field source located outside the circular array of the array current sensor entering the array current sensor.

[0005] According to one aspect of the present application, a current measurement method based on an array current sensor is provided, comprising: Using a target array current sensor to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the magnetic field is composed of the superposition of the magnetic field generated by the conductor and the uniform magnetic field in the environment, and the conductors include the target conductor and the conductors adjacent to the target conductor; Based on each sensor element in the target array current sensor, the electromagnetic component expressions corresponding to the x, y, and z axes of the sensor elements are constructed respectively. Based on the electromagnetic component expressions corresponding to the x, y, and z axes, the electromagnetic component equations corresponding to the sensor elements are constructed, wherein the x, y, and z axes are respectively used as target axes, and the electromagnetic component expressions corresponding to the target axes are constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity components in the target axis direction of the uniform magnetic field in the environment. The expressions of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor are expressed as the following formula: , in, Indicates wire The magnetic induction intensity of the magnetic field generated, represents the vacuum permeability, Indicates wire The calculated current value is Indicates wire The direction vector, Indicates wire The angle with the positive direction of the first axis, Indicates wire The angle between the projection line on the plane formed by the second axis and the third axis and the positive direction of the second axis. When the first axis is the z axis, the second axis is the x axis and the third axis is the y axis. When the first axis is the x axis, the second axis is the y axis and the third axis is the z axis. When the first axis is the y axis, the second axis is the z axis and the third axis is the x axis. Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located, represents the coordinates of the point where the kth sensor element of the array current sensor is located, represents the radius of the array current sensor, represents the kth sensor element of the array current sensor, represents the number of sensor elements, Indicates wire The coordinates of the intersection point with the plane where the array current sensor is located, Indicates wire The distance from the plane where the array current sensor is located, Indicates wire Angle with the plane where the array current sensor is located; The electromagnetic component equations are solved based on the least square method to obtain the calculated current value of the target conductor.

[0006] Preferably, the electromagnetic component equations are expressed as the following formula: , in, Represents the x-axis magnetic induction intensity component of the magnetic field where the target wire is located. Represents the magnetic induction intensity component of the target wire in the y-axis direction of the magnetic field. Represents the magnetic induction intensity component of the target wire in the z-axis direction of the magnetic field. Represents the x-axis magnetic induction intensity component of the uniform magnetic field in the environment, Represents the magnetic induction intensity component in the y-axis direction of the uniform magnetic field in the environment, Represents the z-axis magnetic induction intensity component of the uniform magnetic field in the environment, Indicates the number of wires, Indicates wire The x-axis magnetic induction intensity component of the generated magnetic field is Indicates wire The magnetic induction intensity component of the generated magnetic field in the y-axis direction is Indicates wire The z-axis magnetic flux density component of the generated magnetic field.

[0007] Preferably, constructing the expression of the target axis direction magnetic induction intensity component of the magnetic field generated by each conductor includes: Based on the Ampere loop principle, the expression of the first magnetic induction intensity component is constructed. , in, Indicates the distance from the kth sensor element to the conductor The distance Indicates wire The direction of the magnetic field at the kth sensor element; The distance from the sensor element to the conductor is converted into the product of the direction vector and the displacement, and the distance expression from the sensor element to the conductor is obtained. , in, Indicates wire The direction vector, Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located; Based on the distance expression from the point where the sensor element is located to the wire, the magnetic field direction of the wire on the sensor element is converted into a form to obtain the magnetic field direction expression of the wire on the sensor element. ; Based on the distance expression from the point where the sensor element is located to the wire and the magnetic field direction expression of the wire on the sensor element, the first magnetic induction intensity component expression is updated to obtain the second magnetic induction intensity component expression, ; The coordinates of the points where the sensor elements of the array current sensor are located and the coordinates of the intersections of the conductors and the plane where the array current sensor is located are obtained, and an expression for the displacement between the intersection of the conductors and the plane where the array current sensor is located and the points where the sensor elements of the array current sensor are located is determined according to the coordinates of the points where the sensor elements are located and the coordinates of the intersections, and the expression for the displacement is substituted into the expression for the second magnetic induction intensity component to obtain an expression for the magnetic induction intensity component in the target axis direction of the magnetic field generated by each conductor.

[0008] Preferably, the method of measuring the magnetic induction intensity component of the magnetic field in which the target conductor is located by using the target array current sensor includes: Pre-sleeving the target array current sensor on the target wire; Reading the output voltage components of each sensor element included in the target array current sensor in each axial direction; Each of the output voltage components is divided by the sensitivity parameter of the target array current sensor to obtain a magnetic induction intensity component corresponding to each of the output voltage components.

[0009] Preferably, the method further comprises: Using different array current sensors to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the different array current sensors differ in the number of sensor elements they contain; According to the magnetic induction intensity components obtained by each array current sensor, a corresponding electromagnetic component equation group is constructed, and the corresponding calculated current value is obtained by solving the equation group, and the error between each calculated current value and the true current value of the target conductor is calculated to obtain the measurement error of each array current sensor; Based on the preset simulation software, simulation operations are performed according to each of the measurement errors to obtain a curve of measurement error changing with the number of sensor elements; An optimal number of sensor elements is determined according to the variation curve, and current measurement is performed using an array current sensor having the optimal number of sensor elements.

[0010] Preferably, the target array current sensor comprises a plurality of sensor elements, and the sensor element is integrated by three single-axis chips, and the three single-axis chips respectively measure the output voltage components of the magnetic field in which the target conductor is located in the x-axis, y-axis and z-axis directions.

[0011] According to another aspect of the present application, a current measuring device based on an array current sensor is provided, comprising: A magnetic induction intensity component measurement module is used to measure the magnetic induction intensity component of the magnetic field in which the target wire is located using a target array current sensor, wherein the magnetic field is composed of the magnetic field generated by the wire and the uniform magnetic field in the environment, and the wires include the target wire and the wires adjacent to the target wire; The electromagnetic component equation group construction module is used to construct the electromagnetic component expressions corresponding to the x, y, and z axes corresponding to the sensor elements based on each sensor element in the target array current sensor, and to construct the electromagnetic component equation group corresponding to the sensor elements based on the electromagnetic component expressions corresponding to the x, y, and z axes, respectively, wherein the x, y, and z axes are taken as target axes, and the electromagnetic component expressions corresponding to the target axes are constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity components in the target axis direction of the uniform magnetic field in the environment. The expressions of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor are expressed as the following formulas: , in, Indicates wire The magnetic induction intensity of the magnetic field generated, represents the vacuum permeability, Indicates wire The calculated current value is Indicates wire The direction vector, Indicates wire The angle with the positive direction of the first axis, Indicates wire The angle between the projection line on the plane formed by the second axis and the third axis and the positive direction of the second axis. When the first axis is the z axis, the second axis is the x axis and the third axis is the y axis. When the first axis is the x axis, the second axis is the y axis and the third axis is the z axis. When the first axis is the y axis, the second axis is the z axis and the third axis is the x axis. Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located, represents the coordinates of the point where the kth sensor element of the array current sensor is located, represents the radius of the array current sensor, represents the kth sensor element of the array current sensor, represents the number of sensor elements, Indicates wire The coordinates of the intersection point with the plane where the array current sensor is located, Indicates wire The distance from the plane where the array current sensor is located, Indicates wire Angle with the plane where the array current sensor is located; The equation group solving module is used to solve the electromagnetic component equation group based on the least square method to obtain the calculated current value of the target conductor.

[0012] Preferably, before the electromagnetic component equation group construction module, the device further includes a target axis direction magnetic induction intensity component expression construction module, which is used to construct the target axis direction magnetic induction intensity component expression of the magnetic field generated by each conductor, specifically used to: Based on the Ampere loop principle, the expression of the first magnetic induction intensity component is constructed. , in, Indicates the distance from the kth sensor element to the conductor The distance Indicates wire The direction of the magnetic field at the kth sensor element; The distance from the sensor element to the conductor is converted into the product of the direction vector and the displacement, and the distance expression from the sensor element to the conductor is obtained. , in, Indicates wire The direction vector, Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located; Based on the distance expression from the point where the sensor element is located to the wire, the magnetic field direction of the wire on the sensor element is converted into a form to obtain the magnetic field direction expression of the wire on the sensor element. ; Based on the distance expression from the point where the sensor element is located to the wire and the magnetic field direction expression of the wire on the sensor element, the first magnetic induction intensity component expression is updated to obtain the second magnetic induction intensity component expression, ; The coordinates of the points where the sensor elements of the array current sensor are located and the coordinates of the intersections of the conductors and the plane where the array current sensor is located are obtained, and an expression for the displacement between the intersection of the conductors and the plane where the array current sensor is located and the points where the sensor elements of the array current sensor are located is determined according to the coordinates of the points where the sensor elements are located and the coordinates of the intersections, and the expression for the displacement is substituted into the expression for the second magnetic induction intensity component to obtain an expression for the magnetic induction intensity component in the target axis direction of the magnetic field generated by each conductor.

[0013] Preferably, the magnetic induction intensity component measurement module is used to: Pre-sleeving the target array current sensor on the target wire; Reading the output voltage components of each sensor element included in the target array current sensor in each axial direction; Each of the output voltage components is divided by the sensitivity parameter of the target array current sensor to obtain a magnetic induction intensity component corresponding to each of the output voltage components.

[0014] Preferably, the device further comprises an optimal sensor element quantity determination module, which is used to: Using different array current sensors to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the different array current sensors differ in the number of sensor elements they contain; According to the magnetic induction intensity components obtained by each array current sensor, a corresponding electromagnetic component equation group is constructed, and the corresponding calculated current value is obtained by solving the equation group, and the error between each calculated current value and the true current value of the target conductor is calculated to obtain the measurement error of each array current sensor; Based on the preset simulation software, simulation operations are performed according to each of the measurement errors to obtain a curve of measurement error changing with the number of sensor elements; An optimal number of sensor elements is determined according to the variation curve, and current measurement is performed using an array current sensor having the optimal number of sensor elements.

[0015] Preferably, the target array current sensor comprises a plurality of sensor elements, and the sensor element is integrated by three single-axis chips, and the three single-axis chips respectively measure the output voltage components of the magnetic field in which the target conductor is located in the x-axis, y-axis and z-axis directions.

[0016] According to another aspect of the present application, a storage medium is provided, in which at least one executable instruction is stored, and the executable instruction enables a processor to perform operations corresponding to the current measurement method based on the array current sensor as described above.

[0017] According to another aspect of the present application, a terminal is provided, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other through the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute operations corresponding to the current measurement method based on the array current sensor.

[0018] By means of the above technical solution, the technical solution provided by the embodiment of the present application has at least the following advantages: The present application provides a current measurement method and device based on an array current sensor, a medium, and a terminal. First, a target array current sensor is used to measure the magnetic induction intensity component of the magnetic field in which a target conductor is located. The magnetic field is composed of the superposition of the magnetic field generated by the conductor and the uniform magnetic field in the environment. The conductor includes a target conductor and adjacent conductors of the target conductor. Based on each sensor element in the target array current sensor, an expression of the electromagnetic component corresponding to the x, y, and z axes of the sensor element is constructed respectively. Based on the expression of the electromagnetic component corresponding to the x, y, and z axes, an electromagnetic component equation group corresponding to the sensor element is constructed, wherein the x, y, and z axes are respectively used as target axes, and the electromagnetic component expression corresponding to the target axis is constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity component in the target axis direction of the uniform magnetic field in the environment. The electromagnetic component equation group is solved based on the least squares method to obtain the calculated current value of the target conductor. Compared with the prior art, the embodiment of the present application constructs an electromagnetic component equation group corresponding to each sensor element. The electromagnetic component expression in the electromagnetic component equation group is the sum of the magnetic induction intensity components of the target axis direction of the magnetic field generated by each conductor, and the magnetic induction intensity component of the target axis direction of the uniform magnetic field in the environment, and the equation of the magnetic induction intensity component of the magnetic field in which the target conductor is located measured by the array current sensor. The influence of the magnetic field generated by the conductor and the uniform magnetic field in the environment on the measurement result of the array current sensor is taken into account, so that the accuracy of the current value of the target conductor obtained by solving the electromagnetic component equation group is improved. At the same time, the electromagnetic component equation group is solved by the least squares method. Since the algorithm is mature and easy to implement, the efficiency and accuracy of the equation solution are effectively improved, and the accuracy of the current value of the target conductor is further improved.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A flow chart of a current measurement method based on an array current sensor provided in an embodiment of the present application is shown; Figure 2 A flowchart for constructing an expression for a target axis direction magnetic induction intensity component of a magnetic field generated by each conductor provided in an embodiment of the present application is shown; Figure 3 A flowchart for obtaining a magnetic induction intensity component provided in an embodiment of the present application is shown; Figure 4 A flow chart for determining the optimal number of sensors provided by an embodiment of the present application is shown; Figure 5 A curve diagram showing the variation of the measurement error without adding noise provided by an embodiment of the present application with the number of sensor elements; Figure 6 A curve diagram showing the variation of the measurement error with added noise provided by an embodiment of the present application versus the number of sensor elements is shown; Figure 7 A block diagram of a current measuring device based on an array current sensor provided in an embodiment of the present application is shown; Figure 8 A schematic diagram of the structure of a terminal provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0022] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0023] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0024] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0025] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0026] The embodiments of the present application can be applied to computer systems / servers, which can operate with many other general or special computing system environments or configurations. Examples of well-known computing systems, environments and / or configurations suitable for use with computer systems / servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0027] Computer systems / servers may be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. In general, program modules may include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers may be implemented in a distributed cloud computing environment where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules may be located on local or remote computing system storage media including storage devices.

[0028] The present application embodiment provides a current measurement method based on an array current sensor, such as Figure 1 As shown, the method includes: 101. Use a target array current sensor to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located.

[0029] The magnetic field is composed of the magnetic field generated by the conductor and the uniform magnetic field in the environment; the conductor includes the target conductor and the adjacent conductors of the target conductor; the array current sensor can be composed of multiple TMR sensor elements arranged in a circular matrix; the magnetic induction intensity component is used to characterize the components of the magnetic induction intensity of the magnetic field in the x, y, and z axis directions, which can be measured by the three-axis TMR sensor element. In the embodiment of the present application, the current execution end can be a current measurement module, which uses the magnetic induction intensity component read by the array current sensor to calculate the calculated current value.

[0030] 102. Based on each sensor element in the target array current sensor, construct the electromagnetic component expressions corresponding to the x, y, and z axes of the sensor elements respectively, and based on the electromagnetic component expressions corresponding to the x, y, and z axes respectively, construct the electromagnetic component equation group corresponding to the sensor elements.

[0031] Among them, the x, y, and z axes are taken as target axes respectively, and the electromagnetic component expression corresponding to the target axis is constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each wire and the magnetic induction intensity component in the target axis direction of the uniform magnetic field in the environment.

[0032] Specifically, the electromagnetic component equations are expressed as the following formula: , in, Represents the x-axis magnetic induction intensity component of the magnetic field where the target wire is located. Represents the magnetic induction intensity component of the target wire in the y-axis direction of the magnetic field. Represents the magnetic induction intensity component of the target wire in the z-axis direction of the magnetic field. Represents the x-axis magnetic induction intensity component of the uniform magnetic field in the environment, Represents the magnetic induction intensity component in the y-axis direction of the uniform magnetic field in the environment, Represents the z-axis magnetic induction intensity component of the uniform magnetic field in the environment, Indicates the number of wires, Indicates wire The x-axis magnetic induction intensity component of the generated magnetic field is Indicates wire The magnetic induction intensity component of the generated magnetic field in the y-axis direction is Indicates wire The z-axis magnetic flux density component of the generated magnetic field.

[0033] 103. Solve the electromagnetic component equations based on the least squares method to obtain the calculated current value of the target conductor.

[0034] In the embodiment of the present application, the least squares method is used to solve the electromagnetic component equations. Since the algorithm is mature and easy to implement, the efficiency and accuracy of solving the equations are effectively improved, and the accuracy of the current value of the target conductor is further improved.

[0035] Compared with the prior art, the embodiment of the present application constructs an electromagnetic component equation group corresponding to each sensor element. The electromagnetic component expression in the electromagnetic component equation group is the sum of the magnetic induction intensity components of the target axis direction of the magnetic field generated by each conductor, and the magnetic induction intensity component of the target axis direction of the uniform magnetic field in the environment, and the equation of the magnetic induction intensity component of the magnetic field in which the target conductor is located measured by the array current sensor. The influence of the magnetic field generated by the conductor and the uniform magnetic field in the environment on the measurement result of the array current sensor is taken into account, so that the accuracy of the current value of the target conductor obtained by solving the electromagnetic component equation group is improved. At the same time, the electromagnetic component equation group is solved by the least squares method. Since the algorithm is mature and easy to implement, the efficiency and accuracy of the equation solution are effectively improved, and the accuracy of the current value of the target conductor is further improved.

[0036] In an embodiment of the present application, in order to further define and illustrate, Figure 2 As shown, a method for constructing an expression of a magnetic induction intensity component in the target axis direction of the magnetic field generated by each conductor is provided, including: 201. Based on the Ampere loop principle, construct the expression of the first magnetic induction intensity component. , in, Indicates the distance from the kth sensor element to the conductor The distance Indicates wire Direction of the magnetic field on the kth sensor element 202. Convert the distance from the point where the sensor element is located to the wire into the form of the product of the direction vector and the displacement, and obtain the distance expression from the point where the sensor element is located to the wire. , in, Indicates wire The direction vector, Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located.

[0037] 203. Based on the distance expression from the point where the sensor element is located to the wire, the magnetic field direction of the wire on the sensor element is converted into a form to obtain the magnetic field direction expression of the wire on the sensor element. ; 204. Based on the distance expression from the point where the sensor element is located to the wire and the magnetic field direction expression of the wire on the sensor element, update the first magnetic induction intensity component expression to obtain the second magnetic induction intensity component expression. ; 205. Obtain the coordinates of the point where the sensor element of the array current sensor is located, and the coordinates of the intersection of the wire and the plane where the array current sensor is located, determine the expression of the displacement between the intersection of the wire and the plane where the array current sensor is located to the point where the sensor element of the array current sensor is located according to the coordinates of the point where the sensor element is located and the coordinates of the intersection, and substitute the expression of the displacement into the expression of the second magnetic induction intensity component to obtain the expression of the magnetic induction intensity component in the target axis direction of the magnetic field generated by each wire, , in, Indicates wire The magnetic induction intensity of the magnetic field generated, represents the vacuum permeability, Indicates wire The calculated current value is Indicates wire The direction vector, Indicates wire The angle with the positive direction of the first axis, Indicates wire The angle between the projection line on the plane formed by the second axis and the third axis and the positive direction of the second axis. When the first axis is the z axis, the second axis is the x axis and the third axis is the y axis. When the first axis is the x axis, the second axis is the y axis and the third axis is the z axis. When the first axis is the y axis, the second axis is the z axis and the third axis is the x axis. Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located, represents the coordinates of the point where the kth sensor element of the array current sensor is located, represents the radius of the array current sensor, represents the kth sensor element of the array current sensor, represents the number of sensor elements, Indicates wire The coordinates of the intersection point with the plane where the array current sensor is located, Indicates wire The distance from the plane where the array current sensor is located, Indicates wire The angle between the current sensor and the plane where the array current sensor is located.

[0038] Steps 201-205 of the above embodiment are detailed descriptions of the process of constructing the expression of the target axis direction magnetic induction intensity component of the magnetic field generated by each conductor, wherein the plane where the target array current sensor is located is the xoy plane of the coordinate axis.

[0039] In an embodiment of the present application, in order to further define and illustrate, Figure 3 As shown, step 101 of the embodiment uses a target array current sensor to measure the magnetic induction intensity component of the magnetic field where the target wire is located, including: 301. Pre-connect the target array current sensor onto the target conductor.

[0040] 302. Read the output voltage components of each sensor element included in the target array current sensor in each axial direction.

[0041] Among them, the target array current sensor includes multiple sensor elements; the sensor element is integrated by three single-axis chips, and the three single-axis chips respectively measure the output voltage components of the magnetic field where the target conductor is located in the x-axis, y-axis, and z-axis directions.

[0042] 303. Divide each output voltage component by a sensitivity parameter of the target array current sensor to obtain a magnetic induction intensity component corresponding to each output voltage component.

[0043] Among them, an array current sensor has only one sensitivity parameter.

[0044] In an embodiment of the present application, in order to further define and illustrate, Figure 4 As shown, the embodiment method also includes: 401. Use different array current sensors to measure the magnetic induction intensity components of the magnetic field in which the target conductor is located.

[0045] Among them, the difference between different array current sensors is the number of sensor elements included. In the embodiment of the present application, the number of sensor elements of the selected array current sensor can be 4 or more.

[0046] 402. According to the magnetic induction intensity components obtained by each array current sensor, a corresponding set of electromagnetic component equations is constructed, and the corresponding calculated current values ​​are obtained by solving them. The errors between each calculated current value and the real current value of the target conductor are calculated to obtain the measurement errors of each array current sensor.

[0047] In the embodiment of the present application, a corresponding electromagnetic component equation group is constructed for each array current sensor, and is solved to obtain the error between the calculated current value and the true current value according to the following formula based on the calculated current value obtained by using different array current sensors:

[0048] in, Indicates the error between the calculated current value and the actual current value, Indicates the actual current value.

[0049] 403. Based on the preset simulation software, simulation operations are performed according to each measurement error to obtain a curve of measurement error changing with the number of sensor elements.

[0050] In the embodiment of the present application, based on the measurement errors of the above-mentioned array current sensors, simulation software can be used to generate a curve showing the variation of the measurement error with the number of sensor elements to analyze the influence of the number of sensor elements on the measurement error.

[0051] It should be noted that since the three-axis TMR sensor element may have offset voltage and random noise interference in actual use, the interference can be simulated by adding Gaussian white noise to the data of the magnetic induction intensity component. The measurement error without adding noise varies with the number of sensor elements, as shown in Figure 2. Figure 5 As shown in the figure; the curve of the measurement error with added noise changes with the number of sensor elements, as shown in the figure Figure 6 As shown, represents the error between the calculated current value obtained by the existing method and the actual current value, It represents the error between the calculated current value obtained by the method of the present application and the actual current value.

[0052] 404. Determine an optimal number of sensor elements according to the change curve, and use an array current sensor having the optimal number of sensor elements to perform current measurement.

[0053] In the embodiment of the present application, according to the curve of measurement error obtained in step 403 of the embodiment as a function of the number of sensor elements, It can be seen that when the number of sensor elements reaches 4 (i.e. the optimal number of sensor elements), the maximum magnitude of the error is 1e-8. At this time, the accuracy of the calculated current value has met the requirements. Therefore, an array current sensor with 4 sensor elements can be used for current measurement.

[0054] The present application provides a current measurement method based on an array current sensor. First, a target array current sensor is used to measure the magnetic induction intensity component of the magnetic field in which a target conductor is located. The magnetic field is composed of the superposition of the magnetic field generated by the conductor and the uniform magnetic field in the environment. The conductor includes a target conductor and adjacent conductors of the target conductor. Based on each sensor element in the target array current sensor, an expression of the electromagnetic component corresponding to the x, y, and z axes of the sensor element is constructed respectively. Based on the expression of the electromagnetic component corresponding to the x, y, and z axes, an electromagnetic component equation group corresponding to the sensor element is constructed, wherein the x, y, and z axes are respectively used as target axes, and the electromagnetic component expression corresponding to the target axis is constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity component in the target axis direction of the uniform magnetic field in the environment. The electromagnetic component equation group is solved based on the least squares method to obtain the calculated current value of the target conductor. Compared with the prior art, the embodiment of the present application constructs an electromagnetic component equation group corresponding to each sensor element. The electromagnetic component expression in the electromagnetic component equation group is the sum of the magnetic induction intensity components of the target axis direction of the magnetic field generated by each conductor, and the magnetic induction intensity component of the target axis direction of the uniform magnetic field in the environment, and the equation of the magnetic induction intensity component of the magnetic field in which the target conductor is located measured by the array current sensor. The influence of the magnetic field generated by the conductor and the uniform magnetic field in the environment on the measurement result of the array current sensor is taken into account, so that the accuracy of the current value of the target conductor obtained by solving the electromagnetic component equation group is improved. At the same time, the electromagnetic component equation group is solved by the least squares method. Since the algorithm is mature and easy to implement, the efficiency and accuracy of the equation solution are effectively improved, and the accuracy of the current value of the target conductor is further improved.

[0055] Furthermore, as a response to the above Figure 1 The present invention provides a current measuring device based on an array current sensor. Figure 7 As shown, the device comprises: A magnetic induction intensity component measuring module 51, an electromagnetic component equation group building module 52, and an equation group solving module 53; A magnetic induction intensity component measurement module 51 is used to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located using a target array current sensor, wherein the magnetic field is composed of the magnetic field generated by the conductor and the uniform magnetic field in the environment, and the conductor includes the target conductor and the conductors adjacent to the target conductor; The electromagnetic component equation group construction module 52 is used to construct the electromagnetic component expressions corresponding to the x, y, and z axes corresponding to the sensor elements based on each sensor element in the target array current sensor, and to construct the electromagnetic component equation group corresponding to the sensor elements based on the electromagnetic component expressions corresponding to the x, y, and z axes, respectively, wherein the x, y, and z axes are respectively used as target axes, and the electromagnetic component expressions corresponding to the target axes are constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity components in the target axis direction of the uniform magnetic field in the environment. The magnetic induction intensity component expressions in the target axis direction of the magnetic field generated by each conductor are expressed as the following formula: , in, Indicates wire The magnetic induction intensity of the magnetic field generated, represents the vacuum permeability, Indicates wire The calculated current value is Indicates wire The direction vector, Indicates wire The angle with the positive direction of the first axis, Indicates wire The angle between the projection line on the plane formed by the second axis and the third axis and the positive direction of the second axis. When the first axis is the z axis, the second axis is the x axis and the third axis is the y axis. When the first axis is the x axis, the second axis is the y axis and the third axis is the z axis. When the first axis is the y axis, the second axis is the z axis and the third axis is the x axis. Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located, represents the coordinates of the point where the kth sensor element of the array current sensor is located, represents the radius of the array current sensor, represents the kth sensor element of the array current sensor, represents the number of sensor elements, Indicates wire The coordinates of the intersection point with the plane where the array current sensor is located, Indicates wire The distance from the plane where the array current sensor is located, Indicates wire Angle with the plane where the array current sensor is located; The equation group solving module 53 is used to solve the electromagnetic component equation group based on the least square method to obtain the calculated current value of the target conductor.

[0056] In a specific application scenario, before the electromagnetic component equation group construction module, the device further includes a target axis direction magnetic induction intensity component expression construction module, which is used to construct the target axis direction magnetic induction intensity component expression of the magnetic field generated by each conductor, specifically used for: Based on the Ampere loop principle, the expression of the first magnetic induction intensity component is constructed. , in, Indicates the distance from the kth sensor element to the conductor The distance Indicates wire The direction of the magnetic field at the kth sensor element; The distance from the sensor element to the conductor is converted into the product of the direction vector and the displacement, and the distance expression from the sensor element to the conductor is obtained. , in, Indicates wire The direction vector, Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located; Based on the distance expression from the point where the sensor element is located to the wire, the magnetic field direction of the wire on the sensor element is converted into a form to obtain the magnetic field direction expression of the wire on the sensor element. ; Based on the distance expression from the point where the sensor element is located to the wire and the magnetic field direction expression of the wire on the sensor element, the first magnetic induction intensity component expression is updated to obtain the second magnetic induction intensity component expression, ; The coordinates of the points where the sensor elements of the array current sensor are located and the coordinates of the intersections of the conductors and the plane where the array current sensor is located are obtained, and an expression for the displacement between the intersection of the conductors and the plane where the array current sensor is located and the points where the sensor elements of the array current sensor are located is determined according to the coordinates of the points where the sensor elements are located and the coordinates of the intersections, and the expression for the displacement is substituted into the expression for the second magnetic induction intensity component to obtain an expression for the magnetic induction intensity component in the target axis direction of the magnetic field generated by each conductor.

[0057] In a specific application scenario, the magnetic induction intensity component measurement module is used to: Pre-sleeving the target array current sensor on the target wire; Reading the output voltage components of each sensor element included in the target array current sensor in each axial direction; Each of the output voltage components is divided by the sensitivity parameter of the target array current sensor to obtain a magnetic induction intensity component corresponding to each of the output voltage components.

[0058] In a specific application scenario, the device further includes an optimal sensor element quantity determination module, which is used to: Using different array current sensors to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the different array current sensors differ in the number of sensor elements they contain; According to the magnetic induction intensity components obtained by each array current sensor, a corresponding electromagnetic component equation group is constructed, and the corresponding calculated current value is obtained by solving the equation group, and the error between each calculated current value and the true current value of the target conductor is calculated to obtain the measurement error of each array current sensor; Based on the preset simulation software, simulation operations are performed according to each of the measurement errors to obtain a curve of measurement error changing with the number of sensor elements; An optimal number of sensor elements is determined according to the variation curve, and current measurement is performed using an array current sensor having the optimal number of sensor elements.

[0059] In a specific application scenario, the target array current sensor includes multiple sensor elements, and the sensor element is integrated by three single-axis chips. The three single-axis chips respectively measure the output voltage components of the magnetic field of the target conductor in the x-axis, y-axis, and z-axis directions.

[0060] The present application provides a current measuring device based on an array current sensor. First, a target array current sensor is used to measure the magnetic induction intensity component of the magnetic field in which a target conductor is located. The magnetic field is composed of the superposition of the magnetic field generated by the conductor and the uniform magnetic field in the environment. The conductor includes the target conductor and the adjacent conductors of the target conductor. Based on each sensor element in the target array current sensor, an expression of the electromagnetic component corresponding to the x, y, and z axes of the sensor element is constructed respectively. Based on the expression of the electromagnetic component corresponding to the x, y, and z axes, an electromagnetic component equation group corresponding to the sensor element is constructed, wherein the x, y, and z axes are respectively used as target axes, and the electromagnetic component expression corresponding to the target axis is constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity component in the target axis direction of the uniform magnetic field in the environment. The electromagnetic component equation group is solved based on the least squares method to obtain the calculated current value of the target conductor. Compared with the prior art, the embodiment of the present application constructs an electromagnetic component equation group corresponding to each sensor element. The electromagnetic component expression in the electromagnetic component equation group is the sum of the magnetic induction intensity components of the target axis direction of the magnetic field generated by each conductor, and the magnetic induction intensity component of the target axis direction of the uniform magnetic field in the environment, and the equation of the magnetic induction intensity component of the magnetic field in which the target conductor is located measured by the array current sensor. The influence of the magnetic field generated by the conductor and the uniform magnetic field in the environment on the measurement result of the array current sensor is taken into account, so that the accuracy of the current value of the target conductor obtained by solving the electromagnetic component equation group is improved. At the same time, the electromagnetic component equation group is solved by the least squares method. Since the algorithm is mature and easy to implement, the efficiency and accuracy of the equation solution are effectively improved, and the accuracy of the current value of the target conductor is further improved.

[0061] According to an embodiment of the present application, a storage medium is provided, wherein the storage medium stores at least one executable instruction, and the computer executable instruction can execute the interface access test method in any of the above method embodiments.

[0062] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0063] Figure 8 A schematic diagram of the structure of a terminal provided according to an embodiment of the present application is shown, and the specific embodiment of the present application does not limit the specific implementation of the terminal.

[0064] like Figure 8As shown, the terminal may include: a processor 602 , a communication interface 604 , a memory 606 , and a communication bus 608 .

[0065] The processor 602 , the communication interface 604 , and the memory 606 communicate with each other via a communication bus 608 .

[0066] The communication interface 604 is used to communicate with other devices such as clients or other servers.

[0067] The processor 602 is used to execute the program 610, and specifically can execute the relevant steps in the above-mentioned current measurement method embodiment based on the array current sensor.

[0068] Specifically, the program 610 may include program codes, which include computer operation instructions.

[0069] The processor 602 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application. The one or more processors included in the computer device may be processors of the same type, such as one or more CPUs; or may be processors of different types, such as one or more CPUs and one or more ASICs.

[0070] The memory 606 is used to store the program 610. The memory 606 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0071] The program 610 may be specifically configured to enable the processor 602 to perform the following operations: Using a target array current sensor to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the magnetic field is composed of the superposition of the magnetic field generated by the conductor and the uniform magnetic field in the environment, and the conductors include the target conductor and the conductors adjacent to the target conductor; Based on each sensor element in the target array current sensor, construct the electromagnetic component expressions corresponding to the x, y, and z axes of the sensor elements, respectively, and construct the electromagnetic component equations corresponding to the sensor elements based on the electromagnetic component expressions corresponding to the x, y, and z axes, respectively, wherein the x, y, and z axes are taken as target axes, and the electromagnetic component expressions corresponding to the target axes are constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity component in the target axis direction of the uniform magnetic field in the environment; The electromagnetic component equations are solved based on the least square method to obtain the calculated current value of the target conductor.

[0072] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the physical device of the current measurement method based on the array current sensor, and supports the operation of the information processing program and other software and / or programs. The network communication module is used to realize the communication between the components inside the storage medium, and the communication with other hardware and software in the information processing physical device.

[0073] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0074] The method and system of the present application may be implemented in many ways. For example, the method and system of the present application may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present application are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present application may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present application. Therefore, the present application also covers a recording medium storing a program for executing the method according to the present application.

[0075] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0076] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A current measurement method based on an array current sensor, characterized in that: include: Using a target array current sensor to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the magnetic field is composed of the superposition of the magnetic field generated by the conductor and the uniform magnetic field in the environment, and the conductors include the target conductor and the conductors adjacent to the target conductor; Based on each sensor element in the target array current sensor, the electromagnetic component expressions corresponding to the x, y, and z axes of the sensor elements are constructed respectively. Based on the electromagnetic component expressions corresponding to the x, y, and z axes, the electromagnetic component equations corresponding to the sensor elements are constructed, wherein the x, y, and z axes are respectively used as target axes, and the electromagnetic component expressions corresponding to the target axes are constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity components in the target axis direction of the uniform magnetic field in the environment. The expressions of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor are expressed as the following formula: ， in, Indicates wire The magnetic induction intensity of the magnetic field generated, represents the vacuum permeability, Indicates wire The calculated current value is Indicates wire The direction vector of Indicates wire The angle with the positive direction of the first axis, Indicates wire The angle between the projection line on the plane formed by the second axis and the third axis and the positive direction of the second axis. When the first axis is the z axis, the second axis is the x axis and the third axis is the y axis. When the first axis is the x axis, the second axis is the y axis and the third axis is the z axis. When the first axis is the y axis, the second axis is the z axis and the third axis is the x axis. Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located, represents the coordinates of the point where the kth sensor element of the array current sensor is located, represents the radius of the array current sensor, represents the kth sensor element of the array current sensor, represents the number of sensor elements, Indicates wire The coordinates of the intersection point with the plane where the array current sensor is located, Indicates wire The distance from the plane where the array current sensor is located, Indicates wire Angle with the plane where the array current sensor is located; The electromagnetic component equations are solved based on the least square method to obtain the calculated current value of the target conductor.

2. The method according to claim 1, characterized in that The electromagnetic component equations are expressed as the following formula: ， in, Represents the x-axis magnetic induction intensity component of the magnetic field where the target wire is located. Represents the magnetic induction intensity component of the target wire in the y-axis direction of the magnetic field. Represents the magnetic induction intensity component of the target wire in the z-axis direction of the magnetic field. Represents the x-axis magnetic induction intensity component of the uniform magnetic field in the environment, Represents the magnetic induction intensity component in the y-axis direction of the uniform magnetic field in the environment, Represents the z-axis magnetic induction intensity component of the uniform magnetic field in the environment, Indicates the number of wires, Indicates wire The x-axis magnetic induction intensity component of the generated magnetic field is Indicates wire The magnetic induction intensity component of the generated magnetic field in the y-axis direction is Indicates wire The z-axis magnetic flux density component of the generated magnetic field.

3. The method according to claim 1, characterized in that Construct the expression of the magnetic induction intensity component in the target axis direction of the magnetic field generated by each conductor, including: Based on the Ampere loop principle, the expression of the first magnetic induction intensity component is constructed. ， in, Indicates the distance from the kth sensor element to the conductor The distance Indicates wire The direction of the magnetic field at the kth sensor element; The distance from the sensor element to the conductor is converted into the product of the direction vector and the displacement, and the distance expression from the sensor element to the conductor is obtained. ， in, Indicates wire The direction vector of Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located; Based on the distance expression from the point where the sensor element is located to the wire, the magnetic field direction of the wire on the sensor element is converted into a form to obtain the magnetic field direction expression of the wire on the sensor element. ； Based on the distance expression from the point where the sensor element is located to the wire and the magnetic field direction expression of the wire on the sensor element, the first magnetic induction intensity component expression is updated to obtain the second magnetic induction intensity component expression, ； The coordinates of the points where the sensor elements of the array current sensor are located and the coordinates of the intersections of the conductors and the plane where the array current sensor is located are obtained, and an expression for the displacement between the intersection of the conductors and the plane where the array current sensor is located and the points where the sensor elements of the array current sensor are located is determined according to the coordinates of the points where the sensor elements are located and the coordinates of the intersections, and the expression for the displacement is substituted into the expression for the second magnetic induction intensity component to obtain an expression for the magnetic induction intensity component in the target axis direction of the magnetic field generated by each conductor.

4. The method according to claim 1, characterized in that The method of measuring the magnetic induction intensity component of the magnetic field in which the target conductor is located by using the target array current sensor comprises: Pre-sleeving the target array current sensor on the target wire; Reading the output voltage components of each sensor element included in the target array current sensor in each axial direction; Each of the output voltage components is divided by the sensitivity parameter of the target array current sensor to obtain a magnetic induction intensity component corresponding to each of the output voltage components.

5. The method according to claim 1, characterized in that The method further comprises: Using different array current sensors to measure the magnetic induction intensity component of the magnetic field in which the target conductor is located, the difference between the different array current sensors is that the number of sensor elements included is different; According to the magnetic induction intensity components obtained by each array current sensor, a corresponding electromagnetic component equation group is constructed, and the corresponding calculated current value is obtained by solving the equation group, and the error between each calculated current value and the true current value of the target wire is calculated to obtain the measurement error of each array current sensor; Based on the preset simulation software, simulation operations are performed according to each of the measurement errors to obtain a curve of measurement error changing with the number of sensor elements; An optimal number of sensor elements is determined according to the variation curve, and current measurement is performed using an array current sensor having the optimal number of sensor elements.

6. The method according to claim 4, characterized in that The target array current sensor comprises a plurality of sensor elements, and the sensor element is integrated by three single-axis chips, and the three single-axis chips respectively measure the output voltage components of the magnetic field where the target conductor is located in the x-axis, y-axis and z-axis directions.

7. A current measuring device based on an array current sensor, characterized in that: include: A magnetic induction intensity component measurement module is used to measure the magnetic induction intensity component of the magnetic field in which the target wire is located using a target array current sensor, wherein the magnetic field is composed of the magnetic field generated by the wire and the uniform magnetic field in the environment, and the wires include the target wire and the wires adjacent to the target wire; The electromagnetic component equation group construction module is used to construct the electromagnetic component expressions corresponding to the x, y, and z axes corresponding to the sensor elements based on each sensor element in the target array current sensor, and to construct the electromagnetic component equation group corresponding to the sensor elements based on the electromagnetic component expressions corresponding to the x, y, and z axes, respectively, wherein the x, y, and z axes are taken as target axes, and the electromagnetic component expressions corresponding to the target axes are constructed based on the sum of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor and the magnetic induction intensity components in the target axis direction of the uniform magnetic field in the environment. The expressions of the magnetic induction intensity components in the target axis direction of the magnetic field generated by each conductor are expressed as the following formulas: ， in, Indicates wire The magnetic induction intensity of the magnetic field generated, represents the vacuum permeability, Indicates wire The calculated current value is Indicates wire The direction vector, Indicates wire The angle with the positive direction of the first axis, Indicates wire The angle between the projection line on the plane formed by the second axis and the third axis and the positive direction of the second axis. When the first axis is the z axis, the second axis is the x axis and the third axis is the y axis. When the first axis is the x axis, the second axis is the y axis and the third axis is the z axis. When the first axis is the y axis, the second axis is the z axis and the third axis is the x axis. Indicates wire The displacement between the intersection point with the plane where the array current sensor is located and the point where the kth sensor element of the array current sensor is located, represents the coordinates of the point where the kth sensor element of the array current sensor is located, represents the radius of the array current sensor, represents the kth sensor element of the array current sensor, represents the number of sensor elements, Indicates wire The coordinates of the intersection point with the plane where the array current sensor is located, Indicates wire The distance from the plane where the array current sensor is located, Indicates wire Angle with the plane where the array current sensor is located; The equation group solving module is used to solve the electromagnetic component equation group based on the least square method to obtain the calculated current value of the target conductor.

8. A storage medium, wherein at least one executable instruction is stored in the storage medium, characterized in that: The executable instructions enable the processor to execute operations corresponding to the current measurement method based on an array current sensor according to any one of claims 1 to 6.

9. A terminal, comprising: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, wherein the executable instruction enables the processor to perform operations corresponding to the current measurement method based on an array current sensor as described in any one of claims 1 to 6.

Images