Grounding resistance determination method and apparatus for dual-mode vehicle, and electronic device and storage medium

Abstract

Provided in the present application are a grounding resistance determination method and apparatus for a dual-mode vehicle, and an electronic device and a storage medium. The method comprises: determining a direct-current traction network impedance-admittance matrix corresponding to a direct-current section, an alternating-current traction network impedance-admittance matrix corresponding to an alternating-current section, and a conversion traction network impedance-admittance matrix corresponding to a direct-current / alternating-current conversion section; determining a first grounding resistance value of the direct-current section, a second grounding resistance value of the alternating-current section and a third grounding resistance value of the direct-current / alternating-current conversion section; and on the basis of the first grounding resistance value, the second grounding resistance value and the third grounding resistance value, determining a target grounding resistance value for grounding resistance that meets a preset grounding setting requirement condition and also meets the operation requirements of a vehicle in the direct-current section, the alternating-current section and the direct-current / alternating-current conversion section. In this way, by means of comprehensively taking into consideration the resistances of all sections, a grounding resistance value that best meets conditions is selected, thereby improving the accuracy of determining the resistance value of a grounding resistor.

Description

Methods, devices, electronic equipment, and storage media for determining the grounding resistance of dual-current vehicles.

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 2024106776518, filed on May 29, 2024, entitled "Method, Apparatus, Electronic Device and Storage Medium for Determining Grounding Resistance of Dual-Current Vehicles", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of rail transit, and in particular to methods, apparatus, electronic devices and storage media for determining the grounding resistance of dual-current vehicles. Background Technology

[0004] The electric traction network for rail transit is an electrical power transmission system that provides traction power to subway vehicles. It consists of an overhead contact line (positive pole) and a return line (negative pole), both connected to the traction substation. Currently, rail transit systems supply power to the vehicles via an overhead contact line or contact rail (third rail). The current flows back to the traction substation through the running rail. To ensure normal return current in the circuit during power supply, a circuit grounding method is generally implemented, and a corresponding grounding resistor is installed to ensure that the entire circuit return current meets the design requirements.

[0005] The traction network of a dual-current rail transit line consists of a DC traction network and an AC traction network. During the operation of dual-current vehicles, they will pass through DC sections, AC sections, and DC-AC conversion sections. Since there are certain differences in the power supply voltage in the circuits of each section, how to select the resistance value of the grounding resistor when designing it to ensure that the dual-current vehicles can meet the preset grounding setting requirements and the current potential requirements in the circuit when operating in different sections is an urgent problem to be solved.

[0006] Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a method, apparatus, electronic device, and storage medium for determining the grounding resistance of dual-current vehicles. For different vehicle operating sections, based on the traction network impedance, and combining the vehicle body impedance, the bus impedance corresponding to the grounding bus, and the rail impedance, a grounding resistance value that meets the preset grounding requirements of each section is set. Then, by comprehensively considering the grounding resistance values ​​of each section, a target grounding resistance value that ultimately meets the vehicle operating requirements of all sections is determined. By comprehensively considering the resistance conditions of each section, the most suitable grounding resistance value is selected, thus improving the accuracy of the grounding resistance value determination.

[0008] In a first aspect, this application provides a method for determining the grounding resistance of a dual-current vehicle. The dual-current line includes a DC section, an AC section, and a DC-AC conversion section; the grounding system of the dual-current vehicle includes the vehicle body, grounding busbar, and rails; the determination method includes:

[0009] Determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0010] For the DC section, based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, a first grounding resistance value that meets the preset grounding setting requirements is determined.

[0011] For the AC section, based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, a second grounding resistance value that meets the preset grounding setting requirements is determined.

[0012] For the DC-AC conversion section, based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, a third grounding resistance value that meets the preset grounding setting requirements is determined.

[0013] Based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value is determined that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

[0014] In one possible implementation, determining the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section includes:

[0015] The entire traction power supply system is divided into different sections; wherein, the sections include the traction substation section, the vehicle section, and the cross section connecting the up and down rails;

[0016] For each cross section, calculate the unit self-impedance and mutual impedance of the traction network conductor;

[0017] Based on the unit self-impedance and mutual impedance of the traction network conductors, determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0018] In one possible implementation, the AC traction network impedance admittance matrix corresponding to the AC section is determined by the following steps:

[0019] Based on the traction network potential coefficient matrix, determine the unit AC traction network admittance matrix corresponding to the AC section.

[0020] Based on the unit AC traction network admittance matrix, determine the AC traction network impedance admittance matrix corresponding to the AC section.

[0021] The AC traction network impedance admittance matrix corresponding to the AC section is the AC traction network impedance admittance matrix under a preset length.

[0022] In one possible implementation, determining the unit AC traction network admittance matrix corresponding to the AC section based on the traction network potential coefficient matrix includes:

[0023] Based on the traction network potential coefficient matrix and the rail-to-ground leakage conductance matrix, the unit AC traction network admittance matrix is ​​determined.

[0024] In one possible implementation, the calculation of the unit self-impedance and mutual impedance of the traction network conductors includes:

[0025] The unit self-impedance of the traction network conductor is determined based on the conductor's unit self-resistance, angular frequency, vacuum permeability, and equivalent depth.

[0026] The mutual impedance of the traction network conductors is determined based on the angular frequency, the vacuum permeability, the earth conductivity, the distance between the conductors, and the equivalent depth.

[0027] In one possible implementation, the preset grounding requirement includes at least one of the following:

[0028] The current amplitude of the vehicle body is less than the preset current amplitude, and the potential amplitude of the vehicle's train-axle end is less than the preset potential amplitude threshold.

[0029] In one possible implementation, the operating return circuit of the dual-current vehicle includes a traction inverter, a traction transformer, and a traction converter; the operating modes of the dual-current vehicle include AC mode and DC mode.

[0030] When the dual-current vehicle operates in AC mode, the entire vehicle returns current through the working ground wire of the traction transformer; when the dual-current vehicle operates in DC mode, the traction converter returns current through its own working ground wire.

[0031] Secondly, this application also provides a device for determining the grounding resistance of a dual-current vehicle. The dual-current line includes a DC section, an AC section, and a DC-AC conversion section; the grounding system of the dual-current vehicle includes the vehicle body, a grounding busbar, and rails; the determining device includes:

[0032] The admittance matrix determination module is used to determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0033] The first grounding resistance determination module is used to determine the first grounding resistance value that meets the preset grounding setting requirements for the DC section, based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance.

[0034] The second grounding resistance determination module is used to determine, for the AC section, a second grounding resistance value that meets the preset grounding setting requirements based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance.

[0035] The third grounding resistance determination module is used to determine the third grounding resistance value that meets the preset grounding setting requirements for the DC-AC conversion section, based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance.

[0036] The target grounding resistance determination module is used to determine, based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

[0037] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the method for determining the dual-current vehicle grounding resistance as described in any of the first aspects.

[0038] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the method for determining the dual-current vehicle grounding resistance as described in any of the first aspects.

[0039] The method, apparatus, electronic device, and storage medium for determining the grounding resistance of a dual-current vehicle provided in this application embodiment determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section. For the DC section, a first grounding resistance value that meets preset grounding setting requirements is determined; for the AC section, a second grounding resistance value that meets preset grounding setting requirements is determined; for the DC-AC conversion section, a third grounding resistance value that meets preset grounding setting requirements is determined; based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section is determined. In this way, based on the traction network impedance corresponding to different vehicle operating sections, and combined with the vehicle body impedance of dual-current vehicles, the bus impedance corresponding to the grounding bus, and the rail impedance, grounding resistance values ​​that meet the preset grounding requirements of each section are set. Then, by comprehensively considering the grounding resistance values ​​corresponding to each section, the target grounding resistance value that ultimately meets the vehicle operating requirements of all sections is determined. By comprehensively considering the resistance situation of each section, the most suitable grounding resistance value is selected, thus improving the accuracy of the grounding resistance value determination.

[0040] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 is a flowchart of a method for determining the grounding resistance of a dual-current vehicle provided in an embodiment of this application;

[0043] Figure 2 is a schematic diagram of the traction net division cross-section provided in an embodiment of this application;

[0044] Figure 3 is a schematic diagram of the return circuit structure provided in the embodiment of this application;

[0045] Figure 4 is a schematic diagram of the structure of a device for determining the grounding resistance of a dual-current vehicle provided in an embodiment of this application;

[0046] Figure 5 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0049] First, the applicable scenarios for this application will be introduced. This application can be applied to the field of rail transit technology.

[0050] The electric traction network for rail transit is an electrical power transmission system that provides traction power to subway vehicles. It consists of an overhead contact line (positive pole) and a return line (negative pole), both connected to the traction substation. Currently, rail transit systems supply power to the vehicles via an overhead contact line or contact rail (third rail). The current flows back to the traction substation through the running rail. To ensure normal return current in the circuit during power supply, a circuit grounding method is generally implemented, and a corresponding grounding resistor is installed to ensure that the entire circuit return current meets the design requirements.

[0051] The traction network of a dual-current rail transit line consists of a DC traction network and an AC traction network. During the operation of dual-current vehicles, they will pass through DC sections, AC sections, and DC-AC conversion sections. Since there are certain differences in the power supply voltage in the circuits of each section, how to select the resistance value of the grounding resistor when designing it to ensure that the dual-current vehicles can meet the preset grounding setting requirements and the current potential requirements in the circuit when operating in different sections is an urgent problem to be solved.

[0052] Based on this, embodiments of this application provide a method for determining the grounding resistance of a dual-current vehicle, which comprehensively considers the resistance conditions of each section, selects the most suitable grounding resistance value, and improves the accuracy of determining the grounding resistance value.

[0053] Please refer to Figure 1, which is a flowchart of a method for determining the grounding resistance of a dual-current vehicle according to an embodiment of this application. As shown in Figure 1, the method for determining the grounding resistance of a dual-current vehicle according to an embodiment of this application includes:

[0054] S101. Determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0055] S102. For the DC section, based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, determine the first grounding resistance value that meets the preset grounding setting requirements.

[0056] S103. For the AC section, based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, determine the second grounding resistance value that meets the preset grounding setting requirements.

[0057] S104. For the DC-AC conversion section, based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, determine a third grounding resistance value that meets the preset grounding setting requirements.

[0058] S105. Based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, determine a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

[0059] The method for determining the grounding resistance of dual-current vehicles provided in this application, for different vehicle operating sections, combines the vehicle body impedance, the bus impedance corresponding to the grounding bus, and the rail impedance to set a grounding resistance value that meets the preset grounding requirements of each section. Then, by comprehensively considering the grounding resistance values ​​of each section, the target grounding resistance value that finally meets the vehicle operating requirements of all sections is determined. By comprehensively considering the resistance of each section, the most suitable grounding resistance value is selected, thus improving the accuracy of the grounding resistance value determination.

[0060] The exemplary steps of the embodiments of this application are described below:

[0061] S101. Determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0062] In the embodiments of this application, the dual-current vehicle operating modes are divided into AC mode, DC mode, and DC-AC conversion mode; the operating voltage return circuit and other aspects of the vehicle differ in different modes.

[0063] In one possible implementation, in DC mode, the supply voltage is DC 1500V, and the grid voltage variation range is as follows: DC 1500V contact network supply: DC 1000V~1800V, with a maximum non-sustained voltage of DC 1950V; in AC mode, the supply voltage is AC 25kV, and the grid voltage variation range is as follows: AC 25kV contact network supply: AC 17.5kV~31kV, with a maximum non-sustained voltage of AC 31.5kV.

[0064] Based on this, for vehicles with a defined model, the resistance of the vehicle body is a fixed value. At the same time, the resistance of the grounding busbar and the rails that constitute the grounding system of the whole vehicle are also fixed. However, due to the different power supply voltages under different operating modes, in order to ensure that the current and potential amplitudes are within an acceptable range during the operation of dual-current vehicles, it is necessary to determine an optimal grounding resistance value that can meet the requirements of dual-current vehicles in both DC and AC sections.

[0065] In one possible implementation, when calculating the grounding resistance of the entire grounding system, the traction network impedance, vehicle body impedance, bus impedance corresponding to the grounding bus, and rail impedance are included during vehicle operation; the grounding resistance value is calculated by combining the power supply voltage and current potential amplitude under different operating modes.

[0066] The traction network, in electrified railways, is a high-voltage power transmission line erected in a zigzag pattern above the rails to supply current to the pantograph. It is the main framework of railway electrification engineering, a special type of power transmission line erected above the railway line to supply power to electric locomotives. It consists of several parts: contact suspension, support devices, positioning devices, supports, and foundations.

[0067] In one possible implementation, the traction network includes an AC traction network, a DC traction network, and a DC-AC conversion section model.

[0068] Firstly, AC traction networks generally adopt a power supply method with return lines or an AT power supply method. The impedance of the roadbed section of the AC traction network is considered as a semi-infinite plane earth; the impedance of the tunnel section is considered as a tunnel with infinite earth on all sides.

[0069] Among them, the AT power supply method, also known as the autotransformer power supply method, is a form of electric traction power supply system. For example, the AT power supply method is mainly used in single-phase power frequency AC electrified railways.

[0070] Secondly, since a DC power supply is used, the capacitive and inductive reactance components of the conductor can be ignored when calculating the impedance of the DC traction network. The structure of the DC traction network is "contact wire - rail - drainage network - ground".

[0071] Thirdly, dual-mode lines will have a DC-AC conversion section between the DC and AC sections. The DC-AC conversion section is generally located either at a station or within the section.

[0072] The car body impedance includes the impedance of the connecting lines between train sections and the impedance of the train body itself; the bus impedance corresponding to the grounding bus includes the impedance of the connecting lines between busbars, the impedance of the connecting lines between the grounding busbar and the wheelset, and the protective resistance between the car body and the grounding busbar; the rail impedance includes the rail impedance between wheelsets of the same bogie, the rail impedance between different bogies, and the rail impedance between different cars. These impedances are generally not changed after the vehicle model is determined and can be determined according to the vehicle model.

[0073] Therefore, the calculation process for grounding resistance is reduced to the process of determining the admittance impedance matrix of different traction networks.

[0074] The determination methods for the impedance admittance matrix of different traction networks will be explained separately below.

[0075] In one possible implementation, when calculating the impedance admittance matrix of different traction networks, the traction network can be regarded as a chain circuit composed of parallel multi-wire conductors. The chain circuit is divided into n sections according to the location of the traction substation and the train, and then the calculation is performed.

[0076] Specifically, the step "determining the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section" includes:

[0077] a1: Divide the entire traction power supply system into different sections;

[0078] a2: For each cross section, calculate the unit self-impedance and mutual impedance of the traction network conductor.

[0079] a3: Based on the unit self-impedance and mutual impedance of the traction network conductors, determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0080] In this embodiment of the application, the cross-section may include the traction substation cross-section, the vehicle cross-section, and the cross-section connecting the up and down rails. For example, please refer to Figure 2, which is a schematic diagram of the traction network division cross-section provided in this embodiment of the application. As shown in Figure 2, taking the distance between the two current cross-sections as L as an example, in the grounding loop, the traction network impedance matrix Z includes the length L. L and the traction network admittance matrix Y under length L L .

[0081] Furthermore, after determining the different cross-sections, for each cross-section, it is necessary to determine the unit self-impedance and mutual impedance of the traction network conductors on each cross-section. Then, based on the unit self-impedance and mutual impedance of the traction network conductors, the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section are determined respectively.

[0082] Specifically, the step "Calculate the unit self-impedance and mutual impedance of the traction network conductors" includes:

[0083] b1: Determine the unit self-impedance of the traction network conductor based on the conductor's unit self-resistance, angular frequency, vacuum permeability, and equivalent depth.

[0084] b2: Determine the mutual impedance of the traction network conductors based on the angular frequency, the vacuum permeability, the earth conductivity, the distance between the conductors, and the equivalent depth.

[0085] In one possible implementation, the unit self-impedance of the traction network conductor can be determined by the following formula:

[0086] Among them, Z S R is the unit self-impedance of the traction network conductor; S ω is the unit resistance of the conductor, in Ω / km; ω is the angular frequency, in rad / s; μ0 is the permeability of free space; Dg is the equivalent depth.

[0087] The equivalent depth can be determined using the following formula:

[0088] Where Dg is the equivalent depth; f is the current frequency in Hz; σ is the earth conductivity, taken as 1 / (Ω·cm); and r is the equivalent radius of the conductor.

[0089] In one possible implementation, the mutual impedance of the traction network conductors can be determined using the following formula:

[0090] Among them, Z M ω is the mutual impedance of the traction network conductors; ω is the angular frequency in rad / s; μ0 is the permeability of free space; Dg is the equivalent depth; d ij The distance between conductor i and conductor j is in meters.

[0091] The distance between conductor i and conductor j can be determined using the following formula:

[0092] Where, d ij h is the distance between conductor i and conductor j.i and h j The heights of conductors i and j above the ground are in meters (m); x ij The horizontal distance between conductor i and conductor j is expressed in meters (m).

[0093] Furthermore, after determining the unit self-impedance and mutual impedance of the traction network conductors, the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section can be determined.

[0094] Firstly, for the DC section, the cross section of the DC traction substation can be determined by establishing its Norton equivalent circuit based on the external characteristics of the DC traction substation, and the self-admittance Gii and mutual admittance Gi are determined by the Norton equivalent circuit and adjacent cross sections; for the vehicle cross section of the DC section, the self-admittance Gii and mutual admittance Gi, i-1 and Gi are determined by the cross sections on both sides; for the rail cross section of the DC section, the self-admittance Gii and mutual admittance Gi are determined by the cross sections on both sides and the connection of the cross conductors.

[0095] Secondly, for the AC section, the AC traction network impedance admittance matrix corresponding to the AC section can be determined through the following steps:

[0096] c1: Based on the traction network potential coefficient matrix, determine the unit AC traction network admittance matrix corresponding to the AC section.

[0097] c2: Based on the unit AC traction network admittance matrix, determine the AC traction network impedance admittance matrix corresponding to the AC section.

[0098] In one possible implementation, when calculating the traction network admittance matrix, it is first necessary to solve the traction network potential coefficient matrix, and then solve the traction network admittance matrix based on the traction network potential coefficient matrix.

[0099] Specifically, the traction network potential coefficient matrix can be determined using the following formula:

[0100] Among them, P dxS P is the self-potential coefficient of the conductor; dxM ε0 is the mutual potential coefficient of the conductor; ε0 is the gas dielectric constant; h i r represents the height of conductor i and conductor j above the ground. i D is the radius of conductor i; ij d is the mirror space distance between conductor i and conductor j, in meters; ij Let be the distance between conductor i and conductor j.

[0101] Among them, the gas dielectric coefficient

[0102] In one possible implementation, after determining the traction network potential coefficient matrix, the unit AC traction network admittance matrix corresponding to the AC section can be determined based on the traction network potential coefficient matrix.

[0103] Specifically, the step "determining the unit AC traction network admittance matrix corresponding to the AC section based on the traction network potential coefficient matrix" includes:

[0104] d1: Determine the unit AC traction network admittance matrix based on the traction network potential coefficient matrix and the rail-to-ground leakage conductance matrix.

[0105] Specifically, the admittance matrix of the unit AC traction network can be determined according to the following formula:

[0106] Y = j2πfP -1 +G rg ;

[0107] Where Y is the unit AC traction network admittance matrix; f is the current frequency in Hz; P is the traction network potential coefficient matrix; G rg This is the leakage conductivity matrix of the rail to the ground.

[0108] In one possible implementation, the traction network impedance admittance matrix for length L in the AC section can be determined by the following formula:

[0109] Among them, Z L Y is the impedance matrix of the traction network for length L; L Let L be the admittance matrix of the traction network for length L; Z is the unit impedance matrix; n is the number of sections; and h is the height of the traction network above the ground.

[0110] Thirdly, regarding the DC-AC conversion section, it is assumed that the contact network between the two cross sections of the DC-AC conversion section is connected by admittance Gw, and the rails are connected by admittance Gp. When the contact network between the DC and AC sections is disconnected, it is equivalently valued using a very small admittance, i.e., Gw = δ, δ = 10⁻⁶; when the rails between the DC and AC sections are disconnected; when no train crosses the DC-AC conversion section, it is equivalently valued using a very small admittance, i.e., Gp = δ; when a train crosses the DC-AC conversion section, the DC and AC sections are short-circuited by the train crossing the DC-AC conversion section; Gp is ​​determined by the length of the DC-AC conversion section, the unit resistance of the car body, and the protective resistance between the car body and the bogie; the self-admittance and mutual admittance matrices of the DC-AC conversion section are established; then, the self-admittance increment caused by the DC and AC traction networks of the DC-AC conversion section is considered, thus completing the modeling of the DC-AC conversion section.

[0111] In one possible implementation, after determining the DC traction network impedance admittance matrix, the AC traction network impedance admittance matrix, and the transformed traction network impedance admittance matrix, the corresponding grounding resistance value of each section can be calculated for different operating modes.

[0112] S102. For the DC section, based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, determine the first grounding resistance value that meets the preset grounding setting requirements.

[0113] In this embodiment of the application, for the DC section, based on the power supply voltage of the DC section (e.g., DC1500V) and the preset current amplitude, the total resistance of the entire return circuit can be determined. Then, by subtracting the vehicle body impedance, busbar impedance and rail impedance from the total resistance, the first grounding resistance value corresponding to the DC section is obtained.

[0114] The preset grounding requirements include at least one of the following:

[0115] The current amplitude of the vehicle body is less than the preset current amplitude, and the potential amplitude of the vehicle's train-axle end is less than the preset potential amplitude threshold.

[0116] Specifically, the preset current amplitude and preset potential amplitude threshold can be set based on historical return current data, specific vehicle operation data, vehicle model, and other parameters.

[0117] S103. For the AC section, based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, determine the second grounding resistance value that meets the preset grounding setting requirements.

[0118] In this embodiment of the application, for the AC section, based on the power supply voltage of the AC section (e.g., AC25kV) and the preset current amplitude, the total resistance of the entire return circuit can be determined. Then, by subtracting the vehicle body impedance, busbar impedance and rail impedance from the total resistance, the second grounding resistance value corresponding to the AC section is obtained.

[0119] S104. For the DC-AC conversion section, based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, determine a third grounding resistance value that meets the preset grounding setting requirements.

[0120] In this embodiment of the application, for the DC-AC section, based on the power supply voltage and preset current amplitude of the DC-AC section, the total resistance of the entire return circuit can be determined. Then, by subtracting the vehicle body impedance, busbar impedance and rail impedance from the total resistance, the third grounding resistance value corresponding to the AC section is obtained.

[0121] Furthermore, after determining the first grounding resistance value that meets the preset grounding setting requirements in the DC section, the second grounding resistance value that meets the preset grounding setting requirements in the AC section, and the third grounding resistance value that meets the preset grounding setting requirements in the DC-AC conversion section, the target grounding resistance value can be determined by combining the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value.

[0122] S105. Based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, determine a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

[0123] In this embodiment of the application, after determining the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, it can be determined that the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value all meet the preset grounding setting requirements, and the optimal target grounding resistance value is selected.

[0124] For example, according to the UIC533 standard, the grounding resistance should not exceed 50mΩ. When the grounding resistance is set to 50mΩ, the train body current amplitude in the DC section is 46.81A and the train-axle end potential amplitude is 2.401V; the train body current amplitude in the AC section is 9.857A and the train-axle end potential amplitude is 0.5122V, which meets the requirements.

[0125] Furthermore, vehicle grounding can be divided into two types: functional grounding and protective grounding. The above grounding work refers to functional grounding. The method for determining the grounding resistance value of protective grounding is the same as that of functional grounding, and will not be repeated here.

[0126] In one possible implementation, please refer to FIG3, which is a schematic diagram of the return circuit structure provided in the embodiment of this application; as shown in FIG3, the working return circuit of the dual-current vehicle includes a pantograph and a grounding configuration; the grounding configuration includes a traction inverter, a traction transformer and a traction converter;

[0127] The operating modes of the dual-current vehicle include AC mode and DC mode;

[0128] When the dual-current vehicle operates in AC mode, the entire vehicle returns current through the working ground wire of the traction transformer; when the dual-current vehicle operates in DC mode, the traction converter returns current through its own working ground wire.

[0129] Specifically, assuming a dual-current system vehicle operates under a scenario with no coasting throughout the entire journey, the main circuit current is at its maximum. In this case, the current of the vehicle's axle-end grounding device should be selected based on the current carrying capacity. In addition to the traction inverters found in ordinary subway trains, dual-current system trains also have traction transformers and traction converters. The train completes the switching between different systems at the AC-DC conversion section. The specific switching principle is as follows:

[0130] For vehicles equipped with both transformers and traction converters, the AC and DC working grounds of both devices are connected to the bogie axle head grounding devices, respectively, and to different axle ends. For cars equipped only with traction converters, a single bogie can provide two working grounded axles. To reduce electrical wear on a single axle head, the working return current of a single bogie can be evenly distributed between the two axles. The traction transformer uses single-phase AC 25kV power supply. To reduce the impact of vehicle wiring resistance on the overall vehicle return circuit, the transformer's working grounding uses a 2 / 3 axle redundant connection, ensuring that the two grounding wires are of the same length and have the same equivalent resistance. A poor grounding of a single grounding line will not affect the overall vehicle availability. The traction converter uses AC 970V and DC 1500V power supply after being stepped down by the transformer. When a dual-current vehicle operates in AC mode, the entire vehicle returns current through the transformer's working grounding wire; when a dual-current vehicle operates in DC mode, the traction converter returns current through its own working grounding wire. To avoid crosstalk loops between the DC and AC return lines, which could affect the vehicle's normal return current, in vehicles with both transformers and traction converters installed, the return current grounding of the two devices is connected to different axle ends. Meanwhile, the current carrying capacity of the vehicle's single axle grounding device is selected according to the current requirements under DC operating conditions.

[0131] The method for determining the grounding resistance of a dual-current vehicle provided in this application embodiment determines the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section; for the DC section, a first grounding resistance value that meets the preset grounding setting requirements is determined; for the AC section, a second grounding resistance value that meets the preset grounding setting requirements is determined; for the DC-AC conversion section, a third grounding resistance value that meets the preset grounding setting requirements is determined; based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section is determined. In this way, based on the traction network impedance corresponding to different vehicle operating sections, and combined with the vehicle body impedance of dual-current vehicles, the bus impedance corresponding to the grounding bus, and the rail impedance, grounding resistance values ​​that meet the preset grounding requirements of each section are set. Then, by comprehensively considering the grounding resistance values ​​corresponding to each section, the target grounding resistance value that ultimately meets the vehicle operating requirements of all sections is determined. By comprehensively considering the resistance situation of each section, the most suitable grounding resistance value is selected, thus improving the accuracy of the grounding resistance value determination.

[0132] Based on the same inventive concept, this application also provides a device for determining the grounding resistance of a dual-current vehicle, which corresponds to the method for determining the grounding resistance of a dual-current vehicle. Since the principle of the device in this application is similar to the method for determining the grounding resistance of a dual-current vehicle described above, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0133] Please refer to Figure 4, which is a schematic diagram of a device for determining the grounding resistance of a dual-current vehicle according to an embodiment of this application. As shown in Figure 4, the determining device 400 includes:

[0134] The admittance matrix determination module 410 is used to determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0135] The first grounding resistance determination module 420 is used to determine the first grounding resistance value that meets the preset grounding setting requirements for the DC section based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance.

[0136] The second grounding resistance determination module 430 is used to determine, for the AC section, a second grounding resistance value that meets the preset grounding setting requirements based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance.

[0137] The third grounding resistance determination module 440 is used to determine the third grounding resistance value that meets the preset grounding setting requirements for the DC-AC conversion section based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance.

[0138] The target grounding resistance determination module 450 is used to determine, based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

[0139] In one possible implementation, when determining the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section, the admittance matrix determination module 410 is used to:

[0140] The entire traction power supply system is divided into different sections; wherein, the sections include the traction substation section, the vehicle section, and the cross section connecting the up and down rails;

[0141] For each cross section, calculate the unit self-impedance and mutual impedance of the traction network conductor;

[0142] Based on the unit self-impedance and mutual impedance of the traction network conductors, determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

[0143] In one possible implementation, the admittance matrix determination module 410 is used to determine the AC traction network impedance admittance matrix corresponding to the AC section through the following steps:

[0144] Based on the traction network potential coefficient matrix, determine the unit AC traction network admittance matrix corresponding to the AC section.

[0145] Based on the unit AC traction network admittance matrix, determine the AC traction network impedance admittance matrix corresponding to the AC section.

[0146] The AC traction network impedance admittance matrix corresponding to the AC section is the AC traction network impedance admittance matrix under a preset length.

[0147] In one possible implementation, when the admittance matrix determination module 410 is used to determine the unit AC traction network admittance matrix corresponding to the AC section based on the traction network potential coefficient matrix, the admittance matrix determination module 410 is used to:

[0148] Based on the traction network potential coefficient matrix and the rail-to-ground leakage conductance matrix, the unit AC traction network admittance matrix is ​​determined.

[0149] In one possible implementation, when calculating the unit self-impedance and mutual impedance of the traction network conductors, the admittance matrix determination module 410 is used to:

[0150] The unit self-impedance of the traction network conductor is determined based on the conductor's unit self-resistance, angular frequency, vacuum permeability, and equivalent depth.

[0151] The mutual impedance of the traction network conductors is determined based on the angular frequency, the vacuum permeability, the earth conductivity, the distance between the conductors, and the equivalent depth.

[0152] In one possible implementation, the preset grounding requirement includes at least one of the following:

[0153] The current amplitude of the vehicle body is less than the preset current amplitude, and the potential amplitude of the vehicle's train-axle end is less than the preset potential amplitude threshold.

[0154] In one possible implementation, the operating return circuit of the dual-current vehicle includes a traction inverter, a traction transformer, and a traction converter; the operating modes of the dual-current vehicle include AC mode and DC mode.

[0155] When the dual-current vehicle operates in AC mode, the entire vehicle returns current through the working ground wire of the traction transformer; when the dual-current vehicle operates in DC mode, the traction converter returns current through its own working ground wire.

[0156] The device for determining the grounding resistance of a dual-current vehicle provided in this application determines the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section. For the DC section, a first grounding resistance value that meets the preset grounding setting requirements is determined. For the AC section, a second grounding resistance value that meets the preset grounding setting requirements is determined. For the DC-AC conversion section, a third grounding resistance value that meets the preset grounding setting requirements is determined. Based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section is determined. In this way, based on the traction network impedance corresponding to different vehicle operating sections, and combined with the vehicle body impedance of dual-current vehicles, the bus impedance corresponding to the grounding bus, and the rail impedance, grounding resistance values ​​that meet the preset grounding requirements of each section are set. Then, by comprehensively considering the grounding resistance values ​​corresponding to each section, the target grounding resistance value that ultimately meets the vehicle operating requirements of all sections is determined. By comprehensively considering the resistance situation of each section, the most suitable grounding resistance value is selected, thus improving the accuracy of the grounding resistance value determination.

[0157] Please refer to Figure 5, which is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. As shown in Figure 5, the electronic device 500 includes a processor 510, a memory 520, and a bus 530.

[0158] The memory 520 stores machine-readable instructions that can be executed by the processor 510. When the electronic device 500 is running, the processor 510 and the memory 520 communicate via the bus 530. When the machine-readable instructions are executed by the processor 510, the steps of the method for determining the dual-current vehicle grounding resistance as shown in the method embodiment of Figure 1 above can be executed. For specific implementation methods, please refer to the method embodiment, which will not be repeated here.

[0159] This application also provides a computer-readable storage medium storing a computer program. When the computer program is run by a processor, it can execute the steps of the method for determining the dual-current vehicle grounding resistance as shown in the method embodiment of FIG1 above. For specific implementation details, please refer to the method embodiment, which will not be repeated here.

[0160] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0161] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0162] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0163] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0164] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0165] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for determining the grounding resistance of a dual-current vehicle, characterized in that, Dual-current lines include DC sections, AC sections, and DC-AC conversion sections; The grounding system of a dual-current vehicle includes the vehicle body, grounding busbar, and rails; the determination method includes: Determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section. For the DC section, based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current system vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, a first grounding resistance value that meets the preset grounding setting requirements is determined. For the AC section, based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, a second grounding resistance value that meets the preset grounding setting requirements is determined. For the DC-AC conversion section, based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance, a third grounding resistance value that meets the preset grounding setting requirements is determined. Based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value is determined that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

2. The determination method according to claim 1, characterized in that, Determining the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section includes: The entire traction power supply system is divided into different sections; wherein, the sections include the traction substation section, the vehicle section, and the cross section connecting the up and down rails; For each cross section, calculate the unit self-impedance and mutual impedance of the traction network conductor; Based on the unit self-impedance and mutual impedance of the traction network conductors, determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the DC-AC conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section.

3. The determination method according to claim 2, characterized in that, The impedance admittance matrix of the AC traction network corresponding to the AC section is determined by the following steps: Based on the traction network potential coefficient matrix, determine the unit AC traction network admittance matrix corresponding to the AC section. Based on the unit AC traction network admittance matrix, determine the AC traction network impedance admittance matrix corresponding to the AC section. The AC traction network impedance admittance matrix corresponding to the AC section is the AC traction network impedance admittance matrix under a preset length.

4. The determination method according to claim 3, characterized in that, The determination of the unit AC traction network admittance matrix corresponding to the AC section based on the traction network potential coefficient matrix includes: Based on the traction network potential coefficient matrix and the rail-to-ground leakage conductance matrix, the unit AC traction network admittance matrix is ​​determined.

5. The determination method according to claim 2, characterized in that, The calculation of the unit self-impedance and mutual impedance of the traction network conductors includes: The unit self-impedance of the traction network conductor is determined based on the conductor's unit self-resistance, angular frequency, vacuum permeability, and equivalent depth. The mutual impedance of the traction network conductors is determined based on the angular frequency, the vacuum permeability, the earth conductivity, the distance between the conductors, and the equivalent depth.

6. The determination method according to claim 1, characterized in that, The preset grounding requirements include at least one of the following: The current amplitude of the vehicle body is less than the preset current amplitude, and the potential amplitude of the vehicle's train-axle end is less than the preset potential. Amplitude threshold.

7. The determination method according to claim 1, characterized in that, The working return circuit of the dual-current vehicle includes a traction inverter, a traction transformer, and a traction converter; the working modes of the dual-current vehicle include AC mode and DC mode. When the dual-current vehicle operates in AC mode, the entire vehicle returns current through the working ground wire of the traction transformer; when the dual-current vehicle operates in DC mode, the traction converter returns current through its own working ground wire.

8. A device for determining the grounding resistance of a dual-current vehicle, characterized in that, Dual-current lines include DC sections, AC sections, and DC-AC conversion sections; The grounding system of a dual-current vehicle includes the vehicle body, grounding busbar, and rails; the determining device includes: The admittance matrix determination module is used to determine the DC traction network impedance admittance matrix corresponding to the DC section, the AC traction network impedance admittance matrix corresponding to the AC section, and the conversion traction network impedance admittance matrix corresponding to the DC-AC conversion section. The first grounding resistance determination module is used to determine the first grounding resistance value that meets the preset grounding setting requirements for the DC section, based on the DC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance. The second grounding resistance determination module is used to determine, for the AC section, a second grounding resistance value that meets the preset grounding setting requirements based on the AC traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance. The third grounding resistance determination module is used to determine the third grounding resistance value that meets the preset grounding setting requirements for the DC-AC conversion section, based on the conversion traction network impedance admittance matrix, the vehicle body impedance of the dual-current vehicle, the bus impedance corresponding to the grounding bus, and the rail impedance. The target grounding resistance determination module is used to determine, based on the first grounding resistance value, the second grounding resistance value, and the third grounding resistance value, a target grounding resistance value that meets the preset grounding setting requirements and simultaneously satisfies the vehicle operation requirements of the DC section, the AC section, and the DC-AC conversion section.

9. An electronic device, characterized in that, include: The device includes a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is in operation, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the method for determining the dual-current vehicle grounding resistance as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the method for determining the grounding resistance of a dual-current vehicle as described in any one of claims 1 to 7.

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