Equivalent impedance model construction and parameter acquisition method for charged water body and related device

Abstract

The application discloses a charged water body equivalent impedance model construction and parameter acquisition method and related devices, and innovatively establishes a calculation system containing resistance and inductance correction factors, and realizes high-precision characterization of water body impedance characteristics by introducing an electrode spacing function. Specifically, a scalable grid technology is used to construct an adaptive calculation framework, and the calculation accuracy of resistance and inductance parameters is significantly improved through a power function correction algorithm. A reliable numerical calculation is provided for water body impedance network model analysis in complex hydrological environments. The application solves the problems of the prior art, such as complex modeling process, difficulty in accurately describing nonlinear behavior, insufficient precision, and inability to accurately capture the real behavior of water body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical engineering, and particularly relates to a charged water body equivalent impedance model construction and parameter acquisition method and related device. BACKGROUND

[0002] The water body equivalent model is a method for simulating the influence of water body on leakage current in a power system. In a power system, if there is a leakage situation, such as insulation failure of equipment or external reasons causing current to flow to the ground or water body and other conductive media, leakage current will be generated. The water body equivalent model aims to help simulate and predict the influence of water body on current propagation under leakage conditions. This model is usually achieved by abstracting the water body as an equivalent circuit element. By considering the electrical conductivity, dielectric constant and other parameters of the water body, a corresponding equivalent circuit model can be established to appropriately simulate the influence of the water body in power system analysis. Obviously, the water body equivalent model plays an important role in the field of electrical engineering, especially in electrical design and safety assessment involving ground or water equipment. Using an accurate water body equivalent model can better understand the influence of water body under leakage conditions, helping engineers design safer and more reliable power systems.

[0003] In the prior art, the water body equivalent model method based on finite element analysis discretizes the water body into a finite number of units, and the current characteristics of each unit can be derived through mathematical modeling. Then the distribution of the electric field is solved by the finite element method, including the propagation of electric charge, current density, etc. This method has large amount of calculation, complex modeling process, and limited flexibility in dealing with irregular water body shapes or detailed analysis of specific points. The standard mesh division method of finite element analysis may not be adaptable enough, limiting its wide application in practical application. In addition, the finite element method is mainly suitable for steady-state analysis, and has limited ability to simulate dynamic processes. In summary, the existing water body equivalent model needs a large number of parameters and complex mathematical expressions to describe the characteristics of the water body, which consumes a large amount of computing resources and has a high calculation cost, making the modeling process complex and difficult to accurately describe nonlinear behavior, resulting in insufficient precision and inability to accurately capture the real behavior of the water body. SUMMARY

[0004] The present application provides a charged water body equivalent impedance model construction and parameter acquisition method and related device, which is used to solve the problem that the existing technology has a complex modeling process and is difficult to accurately describe nonlinear behavior, resulting in insufficient precision and inability to accurately capture the real behavior of the water body.

[0005] Therefore, the first aspect of the present application provides a charged water body equivalent impedance model construction and parameter acquisition method, which comprises:

[0006] A scalable mesh is used to construct a water body equivalent impedance network model.

[0007] The power function is used to describe the variation of the equivalent resistance and the equivalent inductance of the water body between the electrodes in the equivalent impedance network model of the water body with the number of grids between the electrodes, to obtain the expression of the equivalent resistance and the expression of the equivalent inductance;

[0008] The expression of the equivalent resistance and the expression of the equivalent inductance are modified respectively to obtain the expression of the grid unit resistance and the expression of the grid unit inductance;

[0009] The water body voltage and the grid unit resistance voltage are measured based on the preset water body measurement circuit, and the equivalent resistance and the equivalent inductance are determined according to the water body voltage and the grid unit resistance voltage;

[0010] The equivalent resistance under different spacings is obtained by changing the electrode spacing, the power function is used to describe the variation of the grid unit resistance with the electrode spacing in combination with the expression of the equivalent resistance and the expression of the grid unit resistance, and the grid resistance parameter is determined based on the variation of the resistance with the electrode spacing;

[0011] The equivalent inductance under different spacings is obtained by changing the electrode spacing, the power function is used to describe the variation of the grid unit inductance with the electrode spacing in combination with the expression of the equivalent inductance and the expression of the grid unit inductance, and the grid inductance parameter is determined based on the variation of the grid unit inductance with the electrode spacing.

[0012] Optionally, the scalable grid comprises:

[0013] The grid size changes with the distance between the electrodes, while the number of grids between the electrodes is maintained at a fixed value, and under the same electrode spacing, the number of equivalent resistances and equivalent inductances of the water body between the electrodes is equal when different grid sizes are selected.

[0014] Optionally, the modification of the expression of the equivalent resistance and the expression of the equivalent inductance to obtain the expression of the grid unit resistance and the expression of the grid unit inductance comprises:

[0015] The expression of the grid unit resistance is obtained by modifying the expression of the equivalent resistance according to the number of grids between the electrodes;

[0016] The expression of the equivalent resistance is:

[0017]

[0018] The expression of the grid unit resistance is:

[0019]

[0020] R = 2πfLe R is the grid cell resistance, τ is a constant to be determined, N is the number of grid cells between electrodes d R0 is a constant to be determined, D is the electrode spacing, g(D) is a function of the first electrode spacing;

[0021] Based on the expression of the equivalent inductance, the grid cell inductance is corrected according to the number of grid cells between electrodes, to obtain an expression of the grid cell inductance;

[0022] The expression of the equivalent inductance is:

[0023]

[0024] The expression of the grid cell inductance is:

[0025]

[0026] In the formula, L e L is the grid cell inductance, γ is a constant to be determined, L0 is a constant to be determined, and f(D) is a function of the second electrode spacing.

[0027] Optionally, the expression of the equivalent resistance is:

[0028]

[0029] In the formula, R e U Re is the voltage of the equivalent resistance, I R is the current of the grid cell resistance.

[0030] Optionally, the expression of the equivalent inductance is:

[0031]

[0032] In the formula, L e U Le is the voltage of the equivalent inductance, I R is the current of the grid cell resistance, and f is the input AC voltage frequency.

[0033] Optionally, the expression of the variation of the grid cell resistance with the electrode spacing is:

[0034]

[0035] In the formula, R is the grid cell resistance, R0 and τ is a constant to be determined, N is the number of grid cells between electrodes d is the electrode spacing.

[0036] Optionally, the expression of the variation law of the grid unit inductance with the electrode spacing is:

[0037]

[0038] In the formula, L is the grid unit inductance, L0 and β are to-be-determined constants, D is the electrode spacing, γ is a to-be-determined constant, N d is the number of electrode grids.

[0039] The second aspect of the present application provides a charged water body equivalent impedance model construction and parameter acquisition system, the system comprises:

[0040] The construction unit is configured to construct a water body equivalent impedance network model by using a scalable grid.

[0041] The first construction unit is configured to use a power function to respectively describe the variation law of the equivalent resistance and the equivalent inductance of the water body between electrodes in the water body equivalent impedance network model with the number of electrode grids, to obtain an expression of the equivalent resistance, and an expression of the equivalent inductance.

[0042] The correction unit is configured to correct the expression of the equivalent resistance and the expression of the equivalent inductance respectively, to obtain an expression of the grid unit resistance and an expression of the grid unit inductance.

[0043] The second construction unit is configured to measure the water body voltage and the grid unit resistance voltage based on a pre-set water body measurement circuit, and to determine the equivalent resistance and the equivalent inductance according to the water body voltage and the grid unit resistance voltage.

[0044] The first acquisition unit is configured to change the electrode spacing to obtain the equivalent resistance under different spacings, to use a power function to describe the variation law of the grid unit resistance with the electrode spacing in combination with the expression of the equivalent resistance and the expression of the grid unit resistance, and to determine the grid resistance parameter based on the variation law of the resistance with the electrode spacing.

[0045] The second acquisition unit is configured to change the electrode spacing to obtain the equivalent inductance under different spacings, to use a power function to describe the variation law of the grid unit inductance with the electrode spacing in combination with the expression of the equivalent inductance and the expression of the grid unit inductance, and to determine the grid inductance parameter based on the variation law of the grid unit inductance with the electrode spacing.

[0046] The third aspect of the present application provides a charged water body equivalent impedance model construction and parameter acquisition device, the device comprises a processor and a memory:

[0047] The memory is configured to store program code and transmit the program code to the processor.

[0048] The processor is configured to execute the steps of the charged water body equivalent impedance model construction and parameter acquisition method according to the instructions in the program code.

[0049] The fourth aspect of the present application provides a computer readable storage medium for storing program code, the program code being used to execute the charged water body equivalent impedance model construction and parameter acquisition method of the first aspect.

[0050] From the above technical solutions, the present application has the following advantages:

[0051] The present application provides a charged water body equivalent impedance model construction and parameter acquisition method, which innovatively establishes a calculation system containing resistance and inductance correction factors, and realizes high-precision characterization of water body impedance characteristics by introducing an electrode spacing function. Specifically, a scalable grid technology is used to construct an adaptive calculation framework, and a power function correction algorithm is used to significantly improve the calculation accuracy of resistance and inductance parameters. A reliable numerical calculation is provided for water body impedance network model analysis in complex hydrological environment. The present application solves the problems of existing technologies, such as complex modeling process, difficulty in accurately describing nonlinear behavior, insufficient precision, and inability to accurately capture the real behavior of water body. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A flowchart of a charged water body equivalent impedance model construction and parameter acquisition method provided in an embodiment of the present application;

[0053] Figure 2 An impedance branch model provided in an embodiment of the present application;

[0054] Figure 3 A water body measurement experiment wiring diagram provided in an embodiment of the present application;

[0055] Figure 4 A water body measurement experiment circuit diagram provided in an embodiment of the present application;

[0056] Figure 5 A phase relationship diagram of each current and voltage provided in an embodiment of the present application;

[0057] Figure 6 A comparison of measured values and simulated values of Re under different electrode spacings provided in an embodiment of the present application;

[0058] Figure 7 A comparison of measured values and simulated values of Le under different electrode spacings provided in an embodiment of the present application;

[0059] Figure 8 A water body equivalent impedance network model provided in an embodiment of the present application;

[0060] Figure 9 This is a schematic diagram of a system for constructing and obtaining parameters of an equivalent impedance model of charged water body provided in an embodiment of this application.

[0061] In the diagram: 1. Oscilloscope; 2. Isolation transformer; 3. Voltage regulator; 4. Sliding rheostat; 5. Impedance branch. Detailed Implementation

[0062] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0063] Please see Figure 1 The present application provides a method for constructing an equivalent impedance model of charged water and obtaining its parameters, including:

[0064] Step 101: Construct a water body equivalent impedance network model using a scalable grid.

[0065] It should be noted that the mesh element of the water body equivalent impedance network model is a tetrahedron, such as... Figure 8 As shown, Figure 8 In this model, x, y, and z represent the three-dimensional coordinate axes. Each element has an impedance branch in each of the x, y, and z directions. The impedance branch model is as follows: Figure 2 As shown, two parameters need to be determined: resistance R and inductance L. This invention employs a scalable grid, meaning that the grid size changes as the actual distance between electrodes changes, while the number of grid cells between electrodes remains constant. Here, the electrodes refer to the endpoints through which electrons enter and exit the water when electricity is applied, including the anode (…). Figure 3 L in the middle) and cathode ( Figure 3 In this context, N represents the distance between the anode and cathode, which is the straight-line distance between them. To ensure the effectiveness of using a scalable grid, with the same electrode spacing, different grid sizes will result in equal or nearly equal water equivalent resistance and inductance between the electrodes.

[0066] It is understood that the water equivalent impedance network model of this invention aims to simplify modeling, improve accuracy, and enhance efficiency. This model describes water characteristics through an impedance network structure, reducing the complexity of parameters and mathematical expressions, lowering modeling time, accurately simulating water behavior under arbitrary instantaneous conditions, and meticulously showcasing the time-varying characteristics of current and voltage in water, thus helping to accurately identify the true behavior of water under leakage conditions.

[0067] Step 102, the power function is used to describe the equivalent resistance and the equivalent inductance of the water body between the electrodes in the equivalent impedance network model of the water body, respectively, the expression of the equivalent resistance is obtained, and the expression of the equivalent inductance is obtained.

[0068] It should be noted that the power function is used to describe the equivalent resistance R e of the water body between the electrodes, which changes with the number of grids N d between the electrodes. In addition, the equivalent resistance R e and the grid unit resistance R e are in a linear relationship, and the expression of R is set as formula (1):

[0069]

[0070] Wherein, R represents the grid unit resistance, and τ is a to-be-determined constant.

[0071] The same method is used to process the relationship between the grid unit inductance and the equivalent inductance between the electrodes. The power function is used to describe the equivalent inductance L e of the water body between the electrodes, which changes with N d . In addition, the equivalent inductance L e and the grid unit inductance L e are in a linear relationship, and the expression of L is set as formula (2):

[0072]

[0073] Wherein, γ is a to-be-determined constant.

[0074] Step 103, the expression of the equivalent resistance and the expression of the equivalent inductance are modified, respectively, to obtain the expression of the grid unit resistance and the expression of the grid unit inductance.

[0075] It should be noted that under different grid numbers N d , in order to keep R e constant, the grid unit resistance R needs to be modified according to N d , and the expression of R is set as formula (3):

[0076]

[0077] Wherein, R0 is a to-be-determined constant, , D is the distance between the electrodes, is a to-be-determined constant, and g(D) is the first function about the distance between the electrodes, so that the N e term in the expression (1) of R d τ can be offset by the corresponding term in the expression (2) of R. When Nd R e is constant. The value of parameter τ can be obtained by data fitting.

[0078] In different grid number N d , in order to make L e constant, it is necessary to modify the grid cell inductance according to N d , that is, assuming the expression of L as formula (4):

[0079]

[0080] Wherein, L0 is a constant, f(D)=D β , D is the distance between electrodes, β is a constant to be determined, f(D) is the second function about the distance between electrodes, so that, in L e , the N d γ term in expression (3) can be offset by the corresponding term in the expression of L (4), when N d takes different values, L e remains constant. Under the same electrode distance D, the grid cell inductance L is a constant, and the value of parameter γ can be obtained by data fitting.

[0081] It should be noted that the "first" and "second" in the above "g(D) is the first function about the distance between electrodes" and "f(D) is the second function about the distance between electrodes" are only for differentiation, and it can be understood that g(D) and f(D) are two different functions of the distance between electrodes.

[0082] Step 104, measure the water voltage and grid cell resistance voltage based on the preset water body measurement circuit, and determine the equivalent resistance and the equivalent inductance according to the water voltage and the grid cell resistance voltage.

[0083] It should be noted that the function g(D) describes the relationship between the electrode distance D and the equivalent resistance R e , and the circuit as shown in Figure 3 is built, the electrodes are placed in the water, the electrode distance is recorded, the alternating current is input, and the waveforms of the voltage U a of the voltage regulator and the voltage U R of the sliding rheostat are recorded respectively by the oscilloscope. The water body is represented as the series connection of the equivalent resistance R e and the equivalent inductance L e , and the experimental circuit can be represented as the equivalent circuit as shown in Figure 4 .

[0084] The measured U R and U a are physical quantities varying with time t, and are written as U R (t) and Ua (t), the current I e (t) flowing through the equivalent resistance R e and the equivalent inductance L R (t) = U R (t) / R, in addition, the voltage across the equivalent resistance R e and the equivalent inductance L e is represented as U RL (t) = U a (t) - U R (t). I R (t) and U RL (t) are physical quantities varying with time t, and the phase relationship between each current and voltage is shown as in FIG. 3. Figure 5

[0085] The phase difference between U R and U RL is calculated, so as to obtain the phase difference θ between U RL and U Re , and further obtain the amplitude of U Re , as in equation (5):

[0086]

[0087] The equivalent resistance R e can be obtained, as in equation (6):

[0088]

[0089] The sampled data of I R (t) is multiplied by R e , so as to obtain U Re (t), and then U Le (t) = U RL (t) - U Re (t) is calculated, so as to obtain U Le (t). The equivalent inductance L e， can be obtained, as in equation (7):

[0090]

[0091] Wherein, f is the frequency of the input alternating voltage.

[0092] In step 105, the equivalent resistance under different electrode spacings is obtained by changing the electrode spacing, the power function is used to describe the change rule of the grid cell resistance with the electrode spacing, combining the expression of the equivalent resistance and the expression of the grid cell resistance, and the grid resistance parameters are determined based on the change rule of the grid cell resistance with the electrode spacing.

[0093] It should be noted that the electrode spacing D is changed, and the R e under different spacings is obtained.the value of R0. According to the formula (1) and (3), the relationship between R and D depends on the expression of the grid cell resistance R, and the variation of R with D is as formula (8): e and D is as formula (8):

[0094] (8)

[0095] wherein R0 and are undetermined constants, and the measured data points of R e are fitted to obtain .

[0096] The value of R0 can be obtained by the following method: an arbitrary value of R0 is selected, denoted as R 00 , which is substituted into the formula (8) to simulate the network, and the equivalent resistance R between the electrodes is obtained, which is compared with the measured R e under the same condition, and the grid resistance parameters are obtained, as formula (9):

[0097] (9)

[0098] The obtained R and R0 are substituted into the formula (8), the modified grid cell resistance is put into the network to simulate, and the equivalent resistance R e with the variation of D is as shown in Figure 6 , and it can be seen that, after the modification of the grid resistance, the variation of R e with D is close to the actual situation.

[0099] In step 106, the equivalent inductance under different electrode spacings is obtained by changing the electrode spacing, the power function is used to describe the variation of the grid cell inductance with the electrode spacing based on the expression of the equivalent inductance and the expression of the grid cell inductance, and the grid inductance parameters are determined based on the variation of the inductance with the electrode spacing.

[0100] It should be noted that the value of L e under different electrode spacings D is obtained. The charged water body is capacitive, so L e is a negative number, and L e decreases with the increase of D. According to the formula (2) and (4), the relationship between L e and D depends on the expression of the grid cell inductance L, and the variation of L with D is as formula (10):

[0101]

[0102] wherein L0 and β are undetermined constants, and the measured data points of L e are fitted to obtain β.

[0103] The value of L0 can be obtained by the following method, optionally selected with a certain value of L0, denoted as L 00 Substitute it into formula (10), simulate the network, and obtain the equivalent inductance between electrodes , and the measured L e under the same conditions, and compare them to obtain the grid inductance parameters as formula (11):

[0104] (11)

[0105] Substitute the obtained β and L0 into formula (10), put the corrected grid unit inductance into the network for simulation, and obtain the equivalent inductance L e The curve of L Figure 7 with the change of D is as shown in the figure, and it can be seen that after the grid inductance is corrected, the change rule of L e with D is close to the actual situation.

[0106] The method provided by the embodiment of the application establishes a calculation system containing resistance and inductance correction factors, realizes high-precision characterization of water body impedance characteristics by introducing an electrode spacing function, and specifically, an adaptive calculation framework is constructed by using a scalable grid technology, and the calculation precision of resistance and inductance parameters is significantly improved by using a power function correction algorithm. The method provides reliable numerical calculation for water body impedance network model analysis in a complex hydrological environment. The method solves the problems of the prior art, such as complex modeling process, difficulty in accurately describing nonlinear behavior, insufficient precision, and inability to accurately capture the real behavior of water bodies.

[0107] The above is a charged water body equivalent impedance model construction and parameter acquisition method provided in the embodiment of the application, and the following is a charged water body equivalent impedance model construction and parameter acquisition system provided in the embodiment of the application.

[0108] Please refer to Figure 9 The charged water body equivalent impedance model construction and parameter acquisition system provided in the embodiment of the application comprises:

[0109] The construction unit 201 is configured to construct a water body equivalent impedance network model by using a scalable grid.

[0110] The first construction unit 202 is configured to use a power function to respectively describe the change rules of the equivalent resistance and the equivalent inductance of the water body between electrodes in the water body equivalent impedance network model with the number of grid units between electrodes, and obtain an expression of the equivalent resistance and an expression of the equivalent inductance.

[0111] The correction unit 203 is configured to correct the expression of the equivalent resistance and the expression of the equivalent inductance respectively, and obtain an expression of a grid unit resistance and an expression of a grid unit inductance.

[0112] The second construction unit 204 measures the water body voltage and the grid cell resistance voltage based on the preset water body measurement circuit, determines the equivalent resistance and the equivalent inductance according to the water body voltage and the grid cell resistance voltage.

[0113] The first acquisition unit 205 is configured to obtain the equivalent resistance under different electrode spacings by changing the electrode spacing, describe the change rule of the grid cell resistance with the electrode spacing by using a power function in combination with the expression of the equivalent resistance and the expression of the grid cell resistance, and determine the grid resistance parameter based on the change rule of the grid cell resistance with the electrode spacing.

[0114] The second acquisition unit 206 is configured to obtain the equivalent inductance under different electrode spacings by changing the electrode spacing, describe the change rule of the grid cell inductance with the electrode spacing by using a power function in combination with the expression of the equivalent inductance and the expression of the grid cell inductance, and determine the grid inductance parameter based on the change rule of the grid cell inductance with the electrode spacing.

[0115] The embodiment of the present application provides a charged water body equivalent impedance model construction and parameter acquisition system, which innovatively establishes a calculation system containing resistance and inductance correction factors, and realizes high-precision characterization of water body impedance characteristics by introducing an electrode spacing function. Specifically, a scalable grid technology is used to construct an adaptive calculation framework, and a power function correction algorithm is used to significantly improve the calculation accuracy of resistance and inductance parameters. A reliable numerical calculation is provided for water body impedance network model analysis in complex hydrological environment. The present application solves the problems of the prior art, such as complex modeling process, difficulty in accurately describing nonlinear behavior, insufficient precision, and inability to accurately capture the real behavior of water body.

[0116] Further, the embodiment of the present application also provides a charged water body equivalent impedance model construction and parameter acquisition device, which comprises a processor and a memory:

[0117] The memory is used to store program code and transmit the program code to the processor.

[0118] The processor is used to execute the steps of the charged water body equivalent impedance model construction and parameter acquisition method according to the instructions in the program code.

[0119] Further, the embodiment of the present application also provides a computer readable storage medium, which is used to store program code, and the program code is used to execute the charged water body equivalent impedance model construction and parameter acquisition method.

[0120] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system and the unit described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0121] The terms "first", "second", "third", "fourth" and the like in the description of this application and in the claims of the foregoing drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so clad can be interchanged, where appropriate, to convey a sense of the embodiments of the present application described herein, for example, can be carried out in other than the order shown or described herein. Also, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus that includes a list of steps or units not necessarily limited to those clearly identified, but can include other not clearly recited or inherent to such processes, methods, products or apparatus.

[0122] It should be understood that, in this application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the relationship between the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases: only A, only B, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including single or multiple items in any combination. For example, at least one of a, b or c, can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0123] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and actual implementation can have another division manner. For example, multiple units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed objects can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0124] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0125] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0126] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), a random access memory (English full name: Random Access Memory, English abbreviation: RAM), a magnetic disk or an optical disk, and various program code storage media.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charged water body equivalent impedance model construction and parameter acquisition method, characterized in that, The method comprises the following steps: An equivalent impedance network model of a water body is constructed by using a scalable grid; A power function is used to respectively describe the variation of the equivalent resistance and the equivalent inductance of the water body between electrodes in the equivalent impedance network model of the water body with the number of grids between the electrodes, to obtain an expression of the equivalent resistance and an expression of the equivalent inductance; The expression of the equivalent resistance and the expression of the equivalent inductance are respectively modified to obtain an expression of the grid unit resistance and an expression of the grid unit inductance; The water body voltage and the grid unit resistance voltage are measured based on a preset water body measurement circuit, and the equivalent resistance and the equivalent inductance are determined according to the water body voltage and the grid unit resistance voltage; The equivalent resistance under different spacings between electrodes is obtained by changing the spacing between electrodes, a power function is used to describe the variation of the grid unit resistance with the spacing between electrodes in combination with the expression of the equivalent resistance and the expression of the grid unit resistance, and the grid resistance parameter is determined based on the variation of the resistance with the spacing between electrodes; The equivalent inductance under different spacings between electrodes is obtained by changing the spacing between electrodes, a power function is used to describe the variation of the grid unit inductance with the spacing between electrodes in combination with the expression of the equivalent inductance and the expression of the grid unit inductance, and the grid inductance parameter is determined based on the variation of the grid unit inductance with the spacing between electrodes; The method further comprises the following steps: The expression of the equivalent resistance is used to modify the grid unit resistance according to the number of grids between the electrodes, to obtain the expression of the grid unit resistance; The expression of the equivalent resistance is: ； The expression of the grid unit resistance is: ； wherein R e is the equivalent resistance, R is the resistance of the mesh element, τ is a constant to be determined, N d is the number of mesh elements between the electrodes, R0 is a constant to be determined, D is the electrode spacing, g(D) is a function of the first electrode spacing; The expression of the equivalent inductance is used to modify the grid unit inductance according to the number of grids between the electrodes, to obtain the expression of the grid unit inductance; The expression of the equivalent inductance is: ； The expression of the grid unit inductance is: ； where L e is the equivalent inductance, L is the grid cell inductance, is a constant to be determined, L0 is a constant to be determined, f(D) is a function of the second electrode spacing; The expression of the variation of the grid unit resistance with the spacing between electrodes is: ； where R is the grid cell resistance, R0 and are constants to be determined, τ is a constant to be determined, N d is the number of grid cells between the electrodes, and D is the inter-electrode distance. The expression of the variation of the grid unit inductance with the spacing between electrodes is: ； where L is the grid cell inductance, L0 and β are constants to be determined, D is the electrode spacing, N is the number of grid cells between electrodes. d N is the number of grid cells between electrodes.

2. The method of claim 1, wherein, The scalable grid comprises: The grid size changes with the distance between electrodes, while the number of grids between the electrodes is maintained at a fixed value; and when different grid sizes are selected under the same spacing between electrodes, the number of equivalent resistances and equivalent inductances of the water body between the electrodes is equal.

3. The method of claim 1, wherein, The expression of the equivalent resistance is: ； where R e is the equivalent resistance, U Re is the voltage of the equivalent resistance, I R is the current of the grid cell resistance.

4. The method of claim 1, wherein, The expression of the equivalent inductance is: ； where L e is the equivalent inductance, U Le is the voltage across the equivalent inductance, I R is the current through the grid cell resistance, and f is the frequency of the input AC voltage.

5. A charged water body equivalent impedance model construction and parameter acquisition system, characterized in that, The method comprises the following steps: A unit is configured to construct an equivalent impedance network model of a water body by using a scalable grid; A first construction unit is configured to use a power function to respectively describe the variation of the equivalent resistance and the equivalent inductance of the water body between electrodes in the equivalent impedance network model of the water body with the number of grids between the electrodes, to obtain an expression of the equivalent resistance and an expression of the equivalent inductance; A modification unit is configured to respectively modify the expression of the equivalent resistance and the expression of the equivalent inductance to obtain an expression of the grid unit resistance and an expression of the grid unit inductance. The second configuration unit measures water voltage and grid cell resistance voltage based on a preset water body measurement circuit, determines equivalent resistance and equivalent inductance according to the water voltage and the grid cell resistance voltage; The first obtaining unit is configured to obtain equivalent resistances under different electrode spacings by changing the electrode spacings, describe a change rule of the grid cell resistance with the electrode spacings by using a power function in combination with an expression of the equivalent resistances and an expression of the grid cell resistance, and determine grid resistance parameters based on the change rule of the grid cell resistance with the electrode spacings; The second obtaining unit is configured to obtain equivalent inductances under different electrode spacings by changing the electrode spacings, describe a change rule of the grid cell inductance with the electrode spacings by using a power function in combination with an expression of the equivalent inductances and an expression of the grid cell inductance, and determine grid inductance parameters based on the change rule of the grid cell inductance with the electrode spacings; The method further includes: The expression of the equivalent resistance is as follows: The expression of the grid cell resistance is as follows: ； The expression of the equivalent inductance is as follows: ； wherein R e is the equivalent resistance, R is the resistance of the mesh cell, τ is a constant to be determined, N d is the number of meshes between the electrodes, R0 is a constant to be determined, D is the distance between the electrodes, g(D) is a function of the first electrode distance; The expression of the grid cell inductance is as follows: The expression of the change rule of the grid cell resistance with the electrode spacings is as follows: ； The expression of the change rule of the grid cell inductance with the electrode spacings is as follows: ； wherein L e is the equivalent inductance, L is the grid cell inductance, is a constant to be determined, L0 is a constant to be determined, f(D) is a function of the second electrode spacing; The device includes a processor and a memory: ； where R is the grid cell resistance, R0 and are constants to be determined, τ is a constant to be determined, N d is the number of grid cells between the electrodes, and D is the inter-electrode distance. The memory is configured to store program code and transmit the program code to the processor; ； where L is the grid cell inductance, L0 and β are constants to be determined, D is the electrode spacing, N is the number of grid cells between electrodes. d N is the number of grid cells between electrodes.

6. A charged water body equivalent impedance model construction and parameter acquisition device, characterized in that, The processor is configured to execute the equivalent impedance model construction and parameter obtaining method according to instructions in the program code. The computer readable storage medium is configured to store program code, and the program code is configured to execute the equivalent impedance model construction and parameter obtaining method. The computer readable storage medium is configured to store program code, and the program code is configured to execute the equivalent impedance model construction and parameter obtaining method.

7. A computer readable storage medium characterized in that, ​

Images