Current Information Simulation Method, Device, Computer Equipment and Storage Medium

Abstract

The present invention relates to a method, device, computer device and storage medium for simulating current information. By obtaining the operation parameter information of the power supply and distribution system, configuring the parameters of the power supply and distribution system model according to the operation parameter information, configuring the parameters of the human body impedance model according to the preset scenario information and the human body impedance information, and simulating the power supply and distribution system model and the human body impedance model with configured parameters to obtain the current information of the simulation system, it realizes parameter configuration in combination with the actual scenario during actual engineering applications, and improves the accuracy of the system model for simulating the human body electric shock current and the system residual current.

Description

Technical Field

[0001] The present invention relates to the field of DC power supply and distribution, and particularly to a method, device, computer device, and storage medium for simulating current information. Background Art

[0002] With the continuous enrichment of power consumption demands, due to factors such as the convenience of accessing distributed energy sources, relatively longer power supply radii, and the large emergence of DC loads such as charging piles, the application scenarios of DC power supply and distribution systems are becoming increasingly common and have become an important direction for the development of distribution networks. However, compared with AC systems, the equipment in DC power supply and distribution systems is more complex and diverse, and the protection technologies traditionally applied to AC systems are difficult to directly migrate to DC power supply and distribution systems, seriously hindering the development of DC power supply and distribution systems.

[0003] The residual current in a DC system can cause hazards such as electric shock to people and electrical fires, which has attracted wide attention. Residual current refers to the current whose vector sum of phase currents in the system line is not zero. Usually, an AC residual current above 40 mA and a DC residual current above 140 mA pose a fatal threat to people. Existing simulation models can only perform a fuzzy estimation of the residual current, with a large deviation in the results and unable to be adjusted according to the actual scenario. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a method, device, computer device, and storage medium for simulating current information.

[0005] A method for simulating current information, characterized in that it is applied to a simulation system, the simulation system includes a power supply and distribution system model and a human body impedance model, and the simulation method includes:

[0006] Obtain the operation parameter information of the power supply and distribution system;

[0007] Configure the parameters of the power supply and distribution system model according to the operation parameter information;

[0008] Configure the parameters of the human body impedance model according to the preset scenario information and the human body impedance information;

[0009] Perform a simulation on the power supply and distribution system model and the human body impedance model after parameter configuration to obtain the current information of the simulation system.

[0010] In one embodiment, the human body impedance information includes the theoretical impedance model of the human body and the impedance ratio information in the human body; the configuring the parameters of the human body impedance model according to the preset scenario information and the human body impedance information includes:

[0011] Obtain the theoretical impedance model and the impedance ratio information;

[0012] Obtain the asymptotic value of the total body impedance according to the impedance model and the impedance ratio information;

[0013] Construct a human body impedance model according to the preset scenario information and the asymptotic value of the total body impedance.

[0014] In one embodiment, the preset scenario information includes the contact area, contact humidity, and electric shock current path when a human body is electrocuted; the constructing a human body impedance model according to the preset scenario information and the asymptotic value of the total body impedance includes:

[0015] Construct a human body impedance model according to the contact area, contact humidity, and electric shock current path when a human body is electrocuted and the asymptotic value of the total body impedance.

[0016] In one embodiment, the current information of the simulation system includes the electric shock current information of the human body impedance model and the residual current information of the power supply and distribution system model; the simulating the parameter-configured power supply and distribution system model and the human body impedance model to obtain the current information of the simulation system includes:

[0017] Simulate the parameter-configured power supply and distribution system model and the human body impedance model;

[0018] Obtain the electric shock current information of the human body impedance model;

[0019] Obtain the residual current information of the power supply and distribution system model.

[0020] In one embodiment, the operating parameter information includes line impedance data and load impedance data; the parameter-configuring the power supply and distribution system model according to the operating parameter information includes:

[0021] Configure the power supply voltage parameter, line impedance parameter, and load impedance parameter of the power supply and distribution system model according to the line impedance data and the load impedance data.

[0022] In one embodiment, the operating parameter information further includes the drive power source information of the power supply and distribution system; the parameter-configuring the power supply and distribution system model according to the operating parameter information further includes:

[0023] Configure the power supply voltage level of the power supply and distribution system model according to the drive power source information.

[0024] In one embodiment, the operating parameter information further includes the grounding information of the power supply and distribution system; the parameter-configuring the power supply and distribution system model according to the operating parameter information further includes:

[0025] Configure the grounding method of the power supply and distribution system model according to the grounding information.

[0026] In one embodiment, it further includes:

[0027] Obtain the system access location information of the power supply and distribution system model;

[0028] Connect the human body impedance model to the power supply and distribution system model according to the system access location information.

[0029] A current information simulation device, applied to a low-voltage DC power supply and distribution system, includes:

[0030] A parameter acquisition module, configured to acquire the operation parameter information of the power supply and distribution system;

[0031] A first parameter configuration module, configured to perform parameter configuration on the power supply and distribution system model according to the operation parameter information;

[0032] A second parameter configuration module, configured to perform parameter configuration on the human body impedance model according to the preset scenario information and human body impedance information;

[0033] A control module, configured to simulate the parameter-configured power supply and distribution system model and the human body impedance model to obtain the current information of the simulation system.

[0034] A computer device includes a memory and a processor. When the computer program stored in the memory is executed by the processor, the processor executes the steps of the method as described above.

[0035] A computer-readable storage medium stores a computer program thereon. When the computer program is executed by a processor, the steps of the method as described above are implemented.

[0036] The above current information simulation method, device, computer device and storage medium obtain the operation parameter information of the power supply and distribution system, perform parameter configuration on the power supply and distribution system model according to the operation parameter information, perform parameter configuration on the human body impedance model according to the preset scenario information and human body impedance information, and simulate the parameter-configured power supply and distribution system model and the human body impedance model to obtain the current information of the simulation system, realizing parameter configuration in combination with the actual scenario during actual engineering applications, and improving the accuracy of the system model for simulating the human body's electric shock current and the system's residual current. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a flowchart of a method for simulating current information in an embodiment;

[0039] Figure 2 It is a specific step flowchart of step 106 in an embodiment;

[0040] Figure 3 It is a schematic diagram of a theoretical impedance model in an embodiment;

[0041] Figure 4 It is a schematic diagram of internal impedance ratio information in an embodiment;

[0042] Figure 5 It is a specific step flowchart of step 108 in an embodiment;

[0043] Figure 6 It is a human body impedance simulation model constructed using the Simulink simulation module in MATLAB in an embodiment;

[0044] Figure 7 It is a power supply and distribution system model constructed using the Simulink simulation module in MATLAB in an embodiment;

[0045] Figure 8 It is a flowchart of a method for simulating current information in an embodiment;

[0046] Figure 9 It is a schematic diagram of the simulation result of the power supply and distribution system model in an embodiment;

[0047] Figure 10 It is a schematic diagram of the simulation result of the power supply and distribution system model in an embodiment;

[0048] Figure 11 It is a schematic diagram of the simulation result of the power supply and distribution system model in an embodiment;

[0049] Figure 12 It is a schematic diagram of the simulation result of the power supply and distribution system model in an embodiment;

[0050] Figure 13 It is a structural block diagram of an apparatus for simulating current information in an embodiment. Detailed implementation manners

[0051] To facilitate the understanding of this application, the following will provide a more comprehensive description of this application with reference to the relevant drawings. Embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of this application more thorough and comprehensive.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0054] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In addition, in the following embodiments, "connection", if there is a transmission of electrical signals or data between the connected objects, should be understood as "electrical connection", "communication connection", etc.

[0055] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising", "including" or "having", etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0056] Refer to Figure 1 , which is a flowchart of the simulation method of current information in an embodiment.

[0057] In this embodiment, the simulation method of this current information is applied to a simulation system, and this simulation system is a simulation system of an actual power supply and distribution system, specifically including a power supply and distribution system model, i.e., a power supply and distribution system simulation model, and a human body impedance model, i.e., a human body impedance simulation model. As Figure 1 shown, the simulation method of this current information includes steps 102 to 108.

[0058] Step 102, obtain the operation parameter information of the power supply and distribution system.

[0059] Optionally, the operating parameter information includes the driving power supply information, line impedance data, load impedance data, and grounding information of the actual power supply and distribution system. Taking the low-voltage DC system as an example, the driving power supply information can be the voltage level used to drive the actual low-voltage DC system; the line impedance data can be the line resistance of the wire in the low-voltage DC system; the load impedance data can be the impedance value at the load end of the low-voltage DC system; and the grounding information can be the grounding mode characteristics of the actual low-voltage DC system.

[0060] Among them, according to the current national standard "Code for Design of Low-Voltage Power Distribution" (GB 50054-2011), there are three grounding forms for low-voltage power distribution systems: IT system, TT system, and TN system; the first letter of IT, TT, and TN represents the relationship between the power supply end and the ground. T means that the neutral point of the power transformer is directly grounded; I indicates that the neutral point of the power transformer is not grounded or grounded through a high impedance. The IT system is a system in which the power supply neutral point is not grounded and the exposed conductive parts of electrical equipment are directly grounded. The IT system can have a neutral line; the TT system is a system in which the power supply neutral point is directly grounded and the exposed conductive parts of electrical equipment are also directly grounded. Usually, the grounding of the power supply neutral point is called working grounding, and the grounding of the exposed conductive parts of the equipment is called protective grounding. The TN system is a system in which the power supply neutral point is directly grounded and the exposed conductive parts of the equipment are directly electrically connected to the power supply neutral point; the TN system mainly relies on a single-phase shell fault to become a single-phase short-circuit fault (the short-circuit current is usually 5.3 times that of the TT system), and the power supply is cut off through short-circuit protection to implement electric shock protection.

[0061] Step 104: Configure the parameters of the power supply and distribution system model according to the operating parameter information.

[0062] Optionally, the method for configuring the parameters of the power supply and distribution system model according to the operating parameter information includes configuring the simulation parameters of the driving power supply voltage level in the power supply and distribution system simulation model according to the voltage level in the actual power supply and distribution system, configuring the simulation parameters of the line resistance of the wire in the power supply and distribution system simulation model according to the line resistance of the wire in the actual power supply and distribution system, configuring the simulation parameters of the load impedance in the power supply and distribution system simulation model according to the impedance value at the load end of the actual power supply and distribution system, and configuring the simulation parameters of the grounding mode in the power supply and distribution system simulation model according to the grounding mode characteristics of the actual power supply and distribution system. Taking the low-voltage DC system as an example, if the driving power supply voltage level of the actual low-voltage DC system is 375V, then the driving power supply voltage level in the low-voltage DC system simulation model is set to 375V, and the same applies to the remaining operating parameter information.

[0063] Step 106: Configure the parameters of the human body impedance model according to the preset scenario information and human body impedance information.

[0064] The human body impedance includes the internal resistance and skin resistance of the human body. The average resistance of the human body can be considered as 100 ohms - 3000 ohms, and is generally calculated as 1000 - 1500 ohms under normal conditions; however, when the contact voltage is constant, the current flowing through the human body is determined by the human body resistance. The smaller the human body resistance, the greater the current flowing through the human body; the human body resistance is not fixed; the contact humidity, i.e., the degree of skin wetness during contact, the contact area, and the path of the electric shock current are all important factors affecting the human body impedance.

[0065] Optionally, the preset scenario information includes the contact area, contact humidity, and electric shock current path when a person is electrocuted. Among them, the contact area when a person is electrocuted includes a large contact area (10,000 square millimeters), a medium contact area (2,000 square millimeters), and a small contact area (100 square millimeters); the contact humidity when a person is electrocuted includes dry, water-wet, and brine-wet conditions; the electric shock current path when a person is electrocuted includes from one hand to the other hand, from one hand to both feet, and from one foot to the other foot.

[0066] Step 108, simulate the power supply and distribution system model and the human body impedance model after parameter configuration to obtain the current information of the simulated system.

[0067] Optionally, the method for simulating the power supply and distribution system model and the human body impedance model after parameter configuration includes using a commercial simulation software, such as the Simulink simulation module in MATLAB, to simulate the power supply and distribution system model and the human body impedance model, and then obtaining.

[0068] The method for simulating the current information provided in this embodiment, by obtaining the operation parameter information of the power supply and distribution system, configuring the parameters of the power supply and distribution system model according to the operation parameter information, configuring the parameters of the human body impedance model according to the preset scenario information and the human body impedance information, and simulating the power supply and distribution system model and the human body impedance model after parameter configuration to obtain the current information of the simulated system, realizes parameter configuration in combination with the actual scenario for actual engineering applications, and improves the accuracy of the system model for simulating the electric shock current of the human body and the residual current of the system.

[0069] Refer to Figure 2 , which is a specific step flow chart of step 106 in an embodiment. In this embodiment, the human body impedance information includes the theoretical impedance model of the human body and the impedance ratio information in the human body. As Figure 2 shown, this step 106 specifically includes steps 202 to 206.

[0070] Step 202, obtain the theoretical impedance model and the impedance ratio information.

[0071] The theoretical impedance model, i.e., the theoretical model of human body impedance, can be a multi-element theoretical model composed of resistors and capacitors connected in series and parallel. For example, Figure 3 As shown, based on the theoretical model of human body impedance, the total theoretical impedance of the human body is analyzed. The total theoretical impedance ZT of the human body consists of two parts: skin impedance Zs1, Zs2 and internal impedance Zi. Generally speaking, the capacitance in the human body is very small, and it can be simplified as internal resistance Ri during calculation.

[0072] The impedance ratio information can be the percentage of the human body impedance relative to the contact current path from one hand to the other hand. For example, Figure 4 As shown, it is a schematic diagram of the distribution of human body impedance in an embodiment. The numbers in the figure represent the percentage of the internal impedance of the relevant human body parts relative to the contact current path from one hand to one foot. The numbers outside the human body represent that the impedance of that part is calculated only when the current flows in or out from that point.

[0073] Step 204, obtain the asymptotic value of the total human body impedance according to the impedance model and the impedance ratio information.

[0074] Optionally, the asymptotic value of the total human body impedance can be the value of the total human body impedance when the electric shock voltage is relatively large. Since the human skin has been broken down when the electric shock voltage is relatively large, the total impedance value at this time is the internal impedance value of the human body, and this value will not be affected by the electric shock voltage and will not change with the increase of the electric shock voltage. Therefore, it is also the asymptotic value of the total human body impedance.

[0075] Among them, the method for obtaining the asymptotic value of the total human body impedance according to the impedance model and the impedance ratio information includes that the asymptotic value of the total human body impedance with the contact current path from hand to hand is obtained from the standard IEC 60749; while the asymptotic values of the total human body impedance under the remaining contact current paths are obtained by conversion according to the theoretical impedance model in Figure 3 and the internal impedance ratio information in Figure 4 .

[0076] Step 206, construct a human body impedance model according to the preset scenario information and the asymptotic value of the total human body impedance.

[0077] Optionally, the preset scenario information refers to dividing the actual application scenario information according to different human body electric shock conditions, etc. in order to effectively simulate the human body impedance situation in the actual application scenario. Among them, different human body electric shock conditions include conditions such as the contact area when the human body is shocked, the contact humidity when the human body is shocked, and the contact current path when the human body is shocked; the method for constructing a human body impedance model according to the preset scenario information and the asymptotic value of the total human body impedance includes jointly fitting according to conditions such as the contact area, contact humidity and contact current path when the human body is shocked, and a large number of historical data of the asymptotic value of the total human body impedance and the electric shock voltage to obtain the following human body impedance model:

[0078] ZT = a·e bU + c·e dU

[0079] In the formula, a, b, c, and d are environmental parameters obtained by fitting under different human electric shock conditions; U is the human body contact voltage; the contact area during human electric shock, the contact humidity during human electric shock, the electric shock current path during human electric shock, etc., directly affect the environmental parameters such as a, b, c, and d; that is, the environmental parameters obtained under different human electric shock conditions are different, and then the human body impedance values under different human electric shock conditions are obtained according to the electric shock voltage.

[0080] Refer to Figure 5 , which is the specific step flow chart of step 108 in an embodiment. In this embodiment, the current information of the simulation system includes the electric shock current information of the human body impedance model and the residual current information of the power supply and distribution system model. As Figure 5 shown, the specific steps of step 108 include step 502 to step 506.

[0081] Step 502, simulate the power supply and distribution system model and the human body impedance model after parameter configuration.

[0082] Optionally, the method for simulating the power supply and distribution system model and the human body impedance model after parameter configuration includes constructing a human body impedance simulation model using commercial simulation software based on the fitted human body impedance model.

[0083] Step 504, obtain the electric shock current information of the human body impedance model.

[0084] Refer to Figure 6 , which is the human body impedance simulation model constructed using the Simulink simulation module in MATLAB in an embodiment. As Figure 6 shown, a controlled current source (CCS) is used to simulate the human body DC impedance; specifically, when the electric shock voltage and the human body impedance are both known, according to Ohm's law, the electric shock current value can be obtained at this time, so a controlled current source is used to simulate the human body DC impedance. From the outside, the current value can be obtained by inputting the voltage value, that is, the current value changes with the change of the voltage value, so a controlled current source is used to simulate the human body DC impedance.

[0085] In Figure 6Among them, U is the contact voltage of the human body, I is the current passing through the human body during electric shock, t is the moment of electric shock, and a, b, c, and d are the environmental parameters in the human impedance model obtained by fitting. After the simulation is completed and the simulation parameters in the human impedance simulation model are configured, the electric shock current information of the human impedance simulation model is obtained through simulation; in the figure, s is the input point of the controlled current source in the Simulink simulation module in MATLAB. By inputting the calculated value into point s, the current source can output the current value; in the figure, g, 1, and 2 are the control points and input / output points of the switch. Generally, when simulating electric shock, it will wait until the circuit is stable before starting. Therefore, a time control switch is set to turn on and off. When the model is not stable, the switch is closed, and the entire human impedance model does not output current, which is equivalent to an open circuit; when the model is stable, the switch is disconnected, and the human impedance model outputs current, which is equivalent to the occurrence of electric shock.

[0086] Step 506, obtain the residual current information of the power supply and distribution system model.

[0087] Refer to Figure 7 , which is the power supply and distribution system model constructed by using the Simulink simulation module in MATLAB in one embodiment. As Figure 7 shown, i s is the human body electric shock current, i Δ1 is the residual current in this coil circuit, that is, the vector sum of the currents of each line within the dotted line coil, i Δ2 is the residual current in this coil circuit, that is, the vector sum of the currents of each line within the dotted line coil. As Figure 7 shown in the scenario, i s = i Δ1 、i Δ2 = 0, Figure 7 The electric shock current in s is i

[0088] Refer to Figure 8 , which is the flowchart of the simulation method of current information in one embodiment. In this embodiment, the simulation method of current information is applied to a simulation system, and the simulation system is a simulation system of an actual power supply and distribution system, specifically including a power supply and distribution system model, that is, a power supply and distribution system simulation model, and a human impedance model, that is, a human impedance simulation model. As Figure 8 shown, the simulation method of current information includes Step 802 to Step 804.

[0089] Step 802, obtain the system access location information of the power supply and distribution system model.

[0090] Step 804: Connect the human body impedance model to the power supply and distribution system model according to the system access location information.

[0091] Optionally, the system access location information includes the connection location or interface information used to connect the human body impedance model in the power supply and distribution system model, establishing the connection between the human body impedance model and the power supply and distribution system model.

[0092] Refer to Figure 9 , which is a schematic diagram of the simulation results of the power supply and distribution system model in an embodiment. In this embodiment, the direct electric shock of the bipolar DC TN-S system is taken as an example. The TN-S system is the TN-S zero protection system, a system with a directly grounded neutral point with a dedicated protection neutral line, commonly known as the three-phase five-wire system. Among them, the driving power supply voltage levels are 750V, ±375V, 220V, ±110V, and 60V respectively, the load currents are 16A, 32A, and 63A respectively, the contact humidity during human electric shock is in dry conditions, the contact area is large, and the electric shock current path is from hand to feet. As Figure 9 shown, at the same driving power supply voltage level, the human body electric shock current decreases with the increase of the load current; since the line voltage drop increases with the increase of the load current, therefore, at the same voltage level, the electric shock current during human electric shock also decreases accordingly; at the 60V voltage level, the electric shock current does not exceed the ventricular fibrillation current threshold, while at the voltage levels of 750V, ±350V, and 220V, the electric shock currents all exceed the ventricular fibrillation current threshold; at the voltage level of ±110V, when the load current is 16A, its electric shock current of 132.8mA is very close to the ventricular fibrillation current threshold of 140mA from the left hand to the feet, with only a difference of about 4.6%; generally, the voltage floating range of the low-voltage DC system is between -20% and 10%, so at this voltage level, if the voltage increases or the load current decreases, the electric shock current is extremely likely to exceed the ventricular fibrillation current threshold, which may cause fatal harm to the human body. Therefore, under the conditions that the contact humidity during human electric shock is in dry conditions, the contact area is large, and the electric shock current path is from hand to feet, 60V is a relatively safe voltage level.

[0093] Refer to Figure 10 , which is a schematic diagram of the simulation results of the power supply and distribution system model in an embodiment. In this embodiment, the direct electric shock of the bipolar DC TN-S system is continued as an example. Among them, the driving power supply voltage levels are 750V, ±375V, 220V, ±110V, and 60V respectively, the load current is 16A, the contact humidity during human electric shock is in dry, water-wet, and brine-wet conditions respectively, the contact area is large, and the electric shock current path is from hand to feet. As Figure 10As shown in the figure, when the voltage level is 750V, the human skin has been broken down, and the total impedance of the human body is manifested as the internal impedance of the human body, which is about 451.8Ω; therefore, when the system voltage is 750V, the electric shock current of the human body under dry, water-wet and salt water-wet conditions is equal; under the voltage levels of ±375V, 220V, ±110V and 60V, the electric shock current increases with the increase of the conductivity of the skin environment; under the voltage level of 60V, the electric shock current will not exceed the ventricular fibrillation current threshold; under the voltage levels of 750V, ±350V and 220V, the electric shock current exceeds the ventricular fibrillation current threshold; under the voltage level of ±110V, when the human body is wetted with salt water, its electric shock current of 148.8mA exceeds the ventricular fibrillation current threshold of 140mA from the left hand to both feet; generally speaking, the voltage floating range of the low-voltage DC system is between -20% and 10%, so under this voltage level, the electric shock current is very easy to exceed the ventricular fibrillation current threshold, which may cause fatal damage to the human body. Therefore, when the human body is electrocuted under the following conditions: dry, water-wet, and salt water-wet conditions, with a large contact area and the current path from hands to feet, 60V is a relatively safe voltage level.

[0094] See also Figure 11 , is the simulation result of the power supply and distribution system model in an embodiment. In this embodiment, the direct electric shock of the bipolar DC TN-S system is continued as an example. Among them, the driving power supply voltage levels are 750V, ±375V, 220V, ±110V, and 60V respectively, the contact areas are large, medium, and small respectively, the load current is 16A, the dry condition, and the electric shock current path is from hands to feet. Figure 11 As shown in the figure, when the system voltage is 750V, the human skin has been broken down, and the electric shock current is equal regardless of whether the contact area is large or small, and the electric shock current at this time far exceeds the corresponding ventricular fibrillation current threshold; under the voltage levels of ±375V, 220V, ±110V, and 60V, the electric shock current decreases as the contact area decreases. This is because under a smaller contact area, the human skin impedance will be greater, resulting in a smaller electric shock current under basically the same contact voltage conditions. Therefore, when the contact areas are large, medium, and small, the load current is 16A, the contact humidity is dry, and the electric shock current path is from hands to feet, 60V is a relatively safe voltage level, and the electric shock current will not exceed the ventricular fibrillation current threshold.

[0095] See also Figure 12 , is the simulation result of the power supply and distribution system model in an embodiment. In this embodiment, the direct electric shock of the bipolar DC TN-S system is continued as an example. Among them, the driving power supply voltage levels are 750V, ±375V, 220V, ±110V, and 60V respectively. The contact humidity when the human body is electrocuted is dry condition, the contact area is large, and the electric shock current path is from one hand to another hand, from one hand to both feet, and from one foot to another foot.Figure 12 As shown, when the system voltage is 750V, the human skin has been broken down, and the internal impedance of the human body at this time is related to the path of the electric shock current flowing through the human body; under the current path from one hand to both feet, the internal impedance of the human body is the smallest, so the electric shock current is the largest at this time; while the internal impedance of the human body in the current path from one foot to the other foot is the largest, with the smallest electric shock current; the ventricular fibrillation current threshold from one foot to the other foot is 3500mA. Therefore, in these voltage levels, a direct electric shock accident from one foot to the other foot generally will not cause fatal harm to people; it can be found from the table that the ventricular fibrillation current threshold from the right hand to the left hand is 175mA, and the ventricular fibrillation current threshold from the left hand to the right hand is 350mA; at the voltage levels of 750V, ±375V, and 220V, in the electric shock accident from one hand to the other hand, the electric shock current may exceed the ventricular fibrillation current threshold. Therefore, under the conditions of a load current of 16A, a dry contact humidity, a large contact area, and an electric shock current path from one hand to the other hand, ±110V and 60V are relatively safe voltage levels.

[0096] It should be understood that although Figure 1 - Figure 2 , Figure 5 and Figure 8 each step in the flowchart is shown in sequence according to the prompt of the arrow, but these steps are not necessarily executed in the order prompted by the arrow. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, Figure 1 - Figure 2 , Figure 5 and Figure 8 at least a part of the steps in

[0097] Refer to Figure 13 , which is a structural block diagram of a simulation device for current information in an embodiment.

[0098] In this embodiment, the simulation device for current information is applied to a simulation system, and the simulation system is a simulation system of an actual power supply and distribution system, specifically including a power supply and distribution system model, that is, a power supply and distribution system simulation model, and a human body impedance model, that is, a human body impedance simulation model. As Figure 13 shown, the simulation device for current information includes a parameter acquisition module 1320, a first parameter configuration module 1340, a second parameter configuration module 1360, and a control module 1380.

[0099] A parameter acquisition module 1320 is configured to acquire the operation parameter information of the power supply and distribution system.

[0100] A first parameter configuration module 1340 is configured to perform parameter configuration on the power supply and distribution system model according to the operation parameter information.

[0101] A second parameter configuration module 1360 is configured to perform parameter configuration on the human body impedance model according to the preset scenario information and the human body impedance information.

[0102] A control module 1380 is configured to simulate the parameter-configured power supply and distribution system model and the human body impedance model to obtain the current information of the simulated system.

[0103] In this embodiment, each module is used to execute Figure 1 the corresponding steps in the corresponding embodiment in Figure 1 and Figure 1 the relevant descriptions in the corresponding embodiment, which will not be elaborated here.

[0104] The simulation device of the current information provided in this embodiment obtains the operation parameter information of the power supply and distribution system through the parameter acquisition module 1320. The first parameter configuration module 1340 performs parameter configuration on the power supply and distribution system model according to the operation parameter information. The second parameter configuration module 1360 performs parameter configuration on the human body impedance model according to the preset scenario information and the human body impedance information. The control module 1380 simulates the parameter-configured power supply and distribution system model and the human body impedance model to obtain the current information of the simulated system, realizing parameter configuration in combination with the actual scenario during actual engineering applications, and improving the accuracy of the system model for simulating the human body's electric shock current and the system's residual current.

[0105] The division of each module in the above simulation device of the current information is only for illustrative purposes. In other embodiments, the simulation device of the current information can be divided into different modules as needed to complete all or part of the functions of the above simulation device of the current information.

[0106] For the specific limitations on the simulation device of the current information, reference can be made to the limitations on the simulation method of the current information in the above text, which will not be elaborated here. Each module in the above simulation device of the current information can be implemented in whole or in part through software, hardware, and their combinations. The above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above respective modules.

[0107] An embodiment of the present application also provides a computer device, including a memory and a processor. A computer program is stored in the memory. When the computer program is executed by the processor, the processor executes the steps of the method in the above embodiment.

[0108] An embodiment of the present application also provides a computer-readable storage medium. One or more non-volatile computer-readable storage media containing computer-executable instructions, when the computer-executable instructions are executed by one or more processors, cause the processors to execute the steps of the method for simulating current information.

[0109] The DC power supply and distribution protection method, device, computer device, and storage medium provided in the above embodiments achieve parameter configuration in combination with actual scenarios during actual engineering applications, improve the accuracy of the system model for simulating human body electric shock current and system residual current, and have important economic value and practical value for popularization.

[0110] Any reference to a memory, storage, database, or other medium used in the present application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM), which is used as an external cache. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0111] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0112] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A method for simulating current information, characterized in that Applied to a simulation system, the simulation system includes a power supply and distribution system model and a human body impedance model, and the simulation method includes: Obtain the operation parameter information of the power supply and distribution system; Configure the parameters of the power supply and distribution system model according to the operation parameter information; Configure the parameters of the human body impedance model according to the preset scenario information and the human body impedance information; Simulate the power supply and distribution system model and the human body impedance model after parameter configuration to obtain the current information of the simulation system; Wherein, the operation parameter information includes line impedance data and load impedance data; the configuring the parameters of the power supply and distribution system model according to the operation parameter information includes: Configure the power supply voltage parameters, line impedance parameters and load impedance parameters of the power supply and distribution system model according to the line impedance data and the load impedance data.

2. The current information simulation method according to claim 1, wherein The human body impedance information includes the theoretical impedance model of the human body and the impedance ratio information in the human body; The configuring the parameters of the human body impedance model according to the preset scenario information and the human body impedance information includes: Obtain the theoretical impedance model and the impedance ratio information; Obtain the asymptotic value of the total human body impedance according to the impedance model and the impedance ratio information; Construct a human body impedance model according to the preset scenario information and the asymptotic value of the total human body impedance.

3. The current information simulation method according to claim 2, wherein The preset scenario information includes the contact area, contact humidity and electric shock current path when a human body is electrocuted; The constructing a human body impedance model according to the preset scenario information and the asymptotic value of the total human body impedance includes: Construct a human body impedance model according to the contact area, contact humidity and electric shock current path when the human body is electrocuted and the asymptotic value of the total human body impedance.

4. The current information simulation method according to claim 1, wherein The current information of the simulation system includes the electric shock current information of the human body impedance model and the residual current information of the power supply and distribution system model; The simulating the power supply and distribution system model and the human body impedance model after parameter configuration to obtain the current information of the simulation system includes: Simulate the power supply and distribution system model and the human body impedance model after parameter configuration; Obtain the electric shock current information of the human body impedance model; Obtain the residual current information of the power supply and distribution system model.

5. The current information simulation method according to claim 1, wherein The operation parameter information further includes the drive power supply information of the power supply and distribution system; The configuring the parameters of the power supply and distribution system model according to the operation parameter information further includes: Configure the power supply voltage level of the power supply and distribution system model according to the drive power supply information.

6. The current information simulation method according to claim 1, characterized in that The operation parameter information further includes the grounding information of the power supply and distribution system; the configuring the parameters of the power supply and distribution system model according to the operation parameter information further includes: Configure the grounding method of the power supply and distribution system model according to the grounding information.

7. The current information simulation method according to claim 1, wherein Further includes: Obtain the system access location information of the power supply and distribution system model; Connect the human body impedance model to the power supply and distribution system model according to the system access location information.

8. An analog device for current information, which is applied to a low-voltage DC power supply and distribution system, is characterized in that Includes: A parameter acquisition module, configured to obtain the operation parameter information of the power supply and distribution system; A first parameter configuration module, configured to configure the parameters of the power supply and distribution system model according to the operation parameter information; A second parameter configuration module, configured to perform parameter configuration on the human body impedance model according to preset scenario information and human body impedance information; A control module, configured to simulate the power supply and distribution system model and the human body impedance model after parameter configuration to obtain current information of the simulation system; Wherein, the operating parameter information includes line impedance data and load impedance data; the performing parameter configuration on the power supply and distribution system model according to the operating parameter information includes: Configuring the power supply voltage parameters, line impedance parameters and load impedance parameters of the power supply and distribution system model according to the line impedance data and the load impedance data.

9. A computer device, characterized in that, Comprising a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor is caused to execute the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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