Method and device for determining direct-current electric shock current of direct-current power distribution equipment

Abstract

The invention discloses a DC electric shock current determination method and device for DC power distribution equipment, and belongs to the technical field of power grid power supply. The determination method comprises the following steps: acquiring a plurality of line direct currents of the direct-current power distribution equipment in a preset time period under a current working condition; determining a plurality of window line direct currents corresponding to every two adjacent sliding windows in the plurality of line direct currents; determining a plurality of difference values between the window direct currents corresponding to every two adjacent sliding windows so as to obtain a plurality of window direct current difference values of the direct current power distribution equipment in a preset time period under the current working condition; and according to the plurality of window direct current difference values, determining the direct current electric shock current of the direct current power distribution equipment in a preset time period under the current working condition. The calculation reliability of the direct-current electric shock current can be improved.

Description

Technical Field

[0001] This application relates to the field of power grid supply technology, and specifically to a method and apparatus for determining the DC electric shock current of DC power distribution equipment. Background Technology

[0002] In recent years, with the implementation of the national green energy and energy conservation and emission reduction strategies, the number of electric vehicles has been increasing. To ensure the normal power supply for a large number of electric vehicles, a large number of battery energy storage devices have been connected to the DC power distribution system. Currently, DC power distribution systems typically adopt ungrounded neutral points or isolated Terra (IT) systems with high impedance grounding. IT systems have the advantages of low residual current and high safety in the event of a single-point grounding fault. To ensure the safe operation of IT systems, the extraction of DC shock current is crucial.

[0003] Existing technologies typically employ blind source separation algorithms to separate the signal features of the DC shock current signal from the line DC signal when the signal characteristics of the DC shock current signal differ significantly. However, when the signal characteristics of the DC shock current signal and the line DC signal are relatively similar, i.e., when the signal correlation between the DC shock current signal and the line DC signal is high, the reliability of the DC shock current signal extracted by the blind source separation algorithm becomes low. Summary of the Invention

[0004] The purpose of this application is to provide a method, apparatus, DC power distribution equipment, and storage medium for determining DC electric shock current in DC power distribution equipment, so as to solve the problem of low reliability in the calculation of DC electric shock current in the prior art.

[0005] To achieve the above objectives, the first aspect of this application provides a method for determining the DC electric shock current of DC power distribution equipment, the method comprising: Obtain the DC current of multiple lines of DC power distribution equipment within a preset time period under current operating conditions; Determine the DC current of multiple window lines corresponding to every two adjacent sliding windows in a plurality of line DC currents. Determine multiple differences between multiple window DC currents corresponding to each pair of adjacent sliding windows to obtain multiple window DC current differences of DC power distribution equipment within a preset time period under the current operating condition; Based on the DC current difference values ​​of multiple windows, determine the DC electric shock current of the DC power distribution equipment within a preset time period under the current operating conditions.

[0006] In this embodiment of the application, determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference values ​​of multiple windows includes: when the DC current difference value of each window is greater than or equal to zero, determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference values ​​of each window according to a first preset DC shock current algorithm; when the DC current difference value of each window is less than zero, determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on a second preset DC shock current algorithm based on the DC current difference values ​​of each window.

[0007] In this embodiment of the application, based on the first preset DC shock current algorithm, the DC shock current of the DC power distribution equipment within a preset time period under the current operating conditions is determined according to the DC current difference of each window, including:

[0008] in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. The first preset current difference threshold is set.

[0009] In this embodiment of the application, based on the second preset DC shock current algorithm, the DC shock current of the DC power distribution equipment within a preset time period under the current operating conditions is determined according to the DC current difference of each window, including:

[0010] in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. This refers to the DC current difference value within the first window of a preset time period under the current operating conditions. This refers to the DC current difference value for the second window within a preset time period under the current operating conditions. This refers to the DC current difference value within the nth window of a preset time period under the current operating conditions. The second preset current difference threshold is defined as n, where n is the number of DC current differences within the window. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. .

[0011] In this embodiment of the application, the method for determining the step size of the sliding window includes:

[0012] in, Within a preset time period The step size of the sliding window at any given time. This is the preset minimum window step size. This is the maximum preset window step size. Within a preset time period The step size of the sliding window at any given time. To adjust the step size of the preset sliding window, Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. This is the preset DC current difference value.

[0013] In this embodiment of the application, the determination method further includes: preprocessing the initial line DC current of the DC power distribution equipment within a preset time period under the current operating conditions to obtain multiple line DC currents.

[0014] In this embodiment of the application, the initial line DC current of the DC power distribution equipment under the current operating condition within a preset time period is preprocessed to obtain multiple line DC currents, including: based on the minimum mean square error filtering algorithm, the initial line DC current of the DC power distribution equipment under the current operating condition within a preset time period is preprocessed to obtain multiple line DC currents.

[0015] A second aspect of this application provides an apparatus for determining the DC electric shock current of a DC power distribution device, comprising: a memory configured to store instructions; and a processor configured to retrieve instructions from the memory and, when executing the instructions, to implement the method for determining the DC electric shock current of a DC power distribution device as described above.

[0016] A third aspect of this application provides a DC power distribution device, including: a device for determining the DC electric current of a DC power distribution device as described above.

[0017] A fourth aspect of this application provides a machine-readable storage medium storing instructions for causing a machine to execute the method described above for determining the DC contact current for DC power distribution equipment.

[0018] The above technical solution, by acquiring multiple line DC currents of the DC power distribution equipment within a preset time period under the current operating conditions, eliminates the need to separate and extract the DC current for the line DC currents compared to existing technologies. By determining the multiple window line DC currents corresponding to every two adjacent sliding windows among the multiple line DC currents, multiple differences between the multiple window DC currents corresponding to every two adjacent sliding windows can be determined, thereby obtaining the multiple window DC current differences of the DC power distribution equipment under the current operating conditions. Furthermore, based on the multiple window DC current differences, the DC current for the DC power distribution equipment within a preset time period under the current operating conditions can be determined, thus improving the reliability of the DC current calculation.

[0019] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings: Figure 1 The illustration shows a flowchart of a method for determining DC electric shock current for DC power distribution equipment according to an embodiment of this application; Figure 2 This illustration schematically shows a current diagram of a DC power distribution device in constant voltage and constant current charging mode according to an embodiment of this application; Figure 3a The diagram illustrates the waveform of the DC current in a DC power distribution device under constant current charging mode according to an embodiment of this application. Figure 3b The diagram illustrates the waveform of the DC current in a DC power distribution device under constant voltage charging mode according to an embodiment of this application. Detailed Implementation

[0021] 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. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0023] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] Figure 1 The illustration schematically shows a flowchart of a method for determining the DC electric shock current of a DC power distribution device according to an embodiment of this application. Figure 1 As shown in the figure, this application provides a method for determining the DC electric shock current of DC power distribution equipment. Taking the application of this method to a processor as an example, the method may include the following steps: Step S101: Obtain the DC current of multiple lines of the DC power distribution equipment within a preset time period under the current operating conditions.

[0026] Step S102: Determine the DC current of multiple window lines corresponding to every two adjacent sliding windows in the multiple line DC currents.

[0027] Step S103: Determine multiple differences between multiple window DC currents corresponding to each pair of adjacent sliding windows, so as to obtain multiple window DC current differences of DC power distribution equipment within a preset time period under the current operating condition.

[0028] Step S104: Determine the DC electric shock current of the DC power distribution equipment within a preset time period under the current operating conditions based on the DC current difference values ​​of multiple windows.

[0029] It can be understood that DC power distribution equipment is equipment capable of processing and transmitting DC power. DC power distribution equipment can include, but is not limited to, DC charging piles, DC energy storage systems, and DC distribution boxes. The current operating condition refers to the state in which the DC power distribution equipment is running. The preset time period is a pre-set time period. The line DC current is the DC current flowing through the lines of the DC power distribution equipment. The sliding window is a sliding window that divides continuous line DC currents; the current window includes current data from the 1st to the 32nd, and the next window includes current data from the 2nd to the 33rd. The window line DC current is the line DC current corresponding to the sliding window. The window DC current difference is the difference between the line DC currents of two adjacent sliding windows. The DC electric shock current is the abnormal current surge value caused by electric shock.

[0030] Specifically, the processor can acquire multiple line DC currents of the DC power distribution equipment within a preset time period under the current operating condition through a current transformer or other current acquisition device, and determine multiple window line DC currents corresponding to adjacent sliding windows from the multiple line DC currents. For example, the window line DC currents corresponding to the first window include I(0), I(1), and I(2), and the window line DC currents corresponding to the second window include I(1), I(2), and I(3). The processor can also determine multiple differences between the window DC currents corresponding to each pair of adjacent sliding windows to obtain the window DC current difference value of the DC power distribution equipment at each moment within the preset time period under the current operating condition. That is, the processor can sequentially determine the difference between I(0) and I(1), the difference between I(1) and I(2), and the difference between I(2) and I(3) to obtain the window DC current difference value of the DC power distribution equipment within the preset time period under the current operating condition. Furthermore, the processor can also sequentially determine the DC electric shock current of the DC power distribution equipment at each moment within the preset time period under the current operating condition based on the multiple window DC current differences.

[0031] The above technical solution, by acquiring multiple line DC currents of the DC power distribution equipment within a preset time period under the current operating conditions, eliminates the need to separate and extract the DC current for the line DC currents compared to existing technologies. By determining the multiple window line DC currents corresponding to every two adjacent sliding windows among the multiple line DC currents, multiple differences between the multiple window DC currents corresponding to every two adjacent sliding windows can be determined, thereby obtaining the multiple window DC current differences of the DC power distribution equipment under the current operating conditions. Furthermore, based on the multiple window DC current differences, the DC current for the DC power distribution equipment within a preset time period under the current operating conditions can be determined, thus improving the reliability of the DC current calculation.

[0032] In this embodiment of the application, determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference values ​​of multiple windows may include: when the DC current difference value of each window is greater than or equal to zero, determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference values ​​of each window, according to a first preset DC shock current algorithm; when the DC current difference value of each window is less than zero, determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on a second preset DC shock current algorithm, according to the DC current difference values ​​of each window.

[0033] It can be understood that the first preset DC shock current algorithm is a pre-set algorithm for determining the DC shock current. The second preset DC shock current algorithm is another pre-set algorithm for determining the DC shock current.

[0034] Specifically, the processor can pre-determine the magnitude of the DC current difference in each window relative to zero. If the DC current difference in each window is greater than or equal to zero, it indicates that the current operating condition of the DC power distribution equipment is an increasing condition. In this case, the processor can determine the DC current at each moment within a preset time period under the current operating condition, based on a first preset DC current difference algorithm and the DC current difference in each window. Conversely, if the DC current difference in each window is less than zero, it indicates that the current operating condition of the DC power distribution equipment is a decreasing condition. The processor can then determine the DC current at each moment within a preset time period under the current operating condition, based on a second preset DC current difference algorithm and the DC current difference in each window. This technical solution enables adaptive current detection of DC power distribution equipment under different operating conditions, improving the accuracy and reliability of DC current detection under different operating states.

[0035] In this embodiment of the application, the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition is determined based on the first preset DC shock current algorithm and the DC current difference of each window, which may include:

[0036] in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. The first preset current difference threshold is set.

[0037] It can be understood that the first preset current difference threshold is a pre-set current difference threshold, which serves as the criterion for judging the DC current difference in the window.

[0038] Specifically, the processor can further compare the window DC current difference at each moment with the first preset current difference threshold. If the window DC current difference is greater than or equal to the first preset current difference threshold, it indicates that the sudden change in the window DC current difference under the current operating condition has exceeded the normal fluctuation range. The processor can then use the window DC current difference at each moment as the valid electric shock signal at the corresponding moment within the preset time period, that is, use the window DC current difference as the DC electric shock current. Conversely, if the window DC current difference is less than the first preset current difference threshold, it indicates that the change in the window DC current difference under the current operating condition is within the normal fluctuation range, and there is no valid electric shock signal. Based on this, the DC electric shock current is determined to be 0. The above technical solution clarifies the criteria for determining a valid electric shock signal under increasing operating conditions, which can improve the reliability of DC electric shock current calculation.

[0039] In this embodiment of the application, the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition is determined based on the second preset DC shock current algorithm and the DC current difference of each window. This may include:

[0040] in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. This refers to the DC current difference value within the first window of a preset time period under the current operating conditions. This refers to the DC current difference value for the second window within a preset time period under the current operating conditions. This refers to the DC current difference value within the nth window of a preset time period under the current operating conditions. The second preset current difference threshold is defined as n, where n is the number of DC current differences within the window. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. .

[0041] It can be understood that the second preset current difference threshold is another preset current difference threshold relative to the first preset current difference threshold.

[0042] Specifically, the processor can further compare the DC current difference between each window with a second preset current difference threshold. If the DC current difference between each window is greater than or equal to the second preset current difference threshold, it indicates that the sudden change in the current window DC current difference has exceeded the normal fluctuation range. The processor can then determine a valid electric shock current signal based on the window DC current difference. That is, it determines the sum between the DC current difference between each window and the average of the DC current differences between all windows within a preset time period, and uses this sum as the DC electric shock current. Conversely, if the DC current difference between each window is less than the second preset current difference threshold, it indicates that the change in the window DC current difference under the current operating condition is within the normal fluctuation range, and there is no valid electric shock signal. Based on this, the DC electric shock current is determined to be 0. The above technical solution clarifies the criteria for determining a valid electric shock signal under decreasing operating conditions, which can improve the reliability of DC electric shock current calculation.

[0043] In this embodiment of the application, the method for determining the step size of the sliding window may include:

[0044] in, Within a preset time period The step size of the sliding window at any given time. This is the preset minimum window step size. This is the maximum preset window step size. Within a preset time period The step size of the sliding window at any given time. To adjust the step size of the preset sliding window, Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. This is the preset DC current difference value.

[0045] It can be understood that the preset minimum window step size is the minimum step size of the preset sliding window. The preset maximum window step size is the maximum step size of the preset sliding window. The step size of the sliding window is the number of current data points enclosed by the sliding window. The preset DC current difference is the preset DC current difference value.

[0046] Specifically, the processor can adaptively adjust the size of the sliding window based on the following formula:

[0047] in, Within a preset time period The step size of the sliding window at any given time. This is the preset minimum window step size. This is the maximum preset window step size. Within a preset time period The step size of the sliding window at any given time. To adjust the step size of the preset sliding window, Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. This is the preset DC current difference value.

[0048] By adaptively adjusting the size of the sliding window, false judgments caused by an excessively small step size can be avoided, as well as false negatives caused by an excessively small step size. This ensures that the size of the sliding window is always within a reasonable range, improving the accuracy of DC electric shock current detection and enhancing the system's adaptability under complex operating conditions.

[0049] In this embodiment of the application, the determination method may further include: preprocessing the initial line DC current of the DC power distribution equipment within a preset time period under the current operating conditions to obtain multiple line DC currents.

[0050] It can be understood that the initial DC current of the line is the initial current signal measured by the current transformer.

[0051] Specifically, since there are a large number of harmonic signals in the initial line DC current, in order to extract the DC electric shock current from the initial line DC current more accurately, the initial line DC current needs to be preprocessed.

[0052] In this embodiment of the application, the initial line DC current of the DC power distribution equipment within a preset time period under the current operating condition is preprocessed to obtain multiple line DC currents. This may include: preprocessing the initial line DC current of the DC power distribution equipment within a preset time period under the current operating condition based on the minimum mean square error filtering algorithm to obtain multiple line DC currents.

[0053] It can be understood that the Least Mean Squares (LMS) filtering algorithm is a filtering algorithm that minimizes the mean square error between the green wave output and the desired signal by iteratively adjusting the filter weights.

[0054] The processor can preprocess the initial line DC current of DC power distribution equipment within a preset time period under the current operating conditions based on the minimum mean square error filtering algorithm or other filtering algorithms to obtain multiple line DC currents. The LMS algorithm has strong dynamic adjustment capability and robustness when processing nonlinear time-varying signals, and can better adapt to the characteristics of complex signals, thereby improving the accuracy of DC electric shock current calculation.

[0055] A specific embodiment of this application provides a method for determining the DC electric shock current of DC power distribution equipment, the method including: DC power distribution equipment can include, but is not limited to, DC charging piles and energy storage systems. DC charging piles and energy storage systems operate under similar conditions, typically employing different control methods such as constant current-constant voltage float charging, constant power charging, and constant current charging. Taking constant current-constant voltage equalization charging as an example, the control diagram for constant current-constant voltage equalization charging is shown below. Figure 2 As shown. In constant current mode, the current remains constant while the DC voltage gradually increases. When it reaches the battery's rated voltage, it switches to constant voltage equalization charging, where the DC voltage remains constant until the output current reaches zero, at which point charging stops. When a two-point fault occurs in either constant current or constant voltage mode, the sampled DC line current waveform is as follows: Figure 3a and Figure 3b As shown, the DC line current always exhibits a slow, nonlinear, abrupt increase.

[0056] Based on this, the processor can acquire the initial line DC current X(t) through a current transformer. Since the initial line DC current X(t) contains a large number of harmonic signals, preprocessing is required to extract the DC current more accurately. The processor can preprocess the initial line DC current X(t) based on the LMS algorithm to obtain the line DC current. Furthermore, the processor can determine the average of multiple differences between the window line DC currents within adjacent sliding windows to obtain the window DC current difference of the DC distribution equipment within a preset time period under the current operating conditions. The step size of the sliding window can be determined by the following formula:

[0057] in, Within a preset time period The step size of the sliding window at any given time. This is the preset minimum window step size. This is the maximum preset window step size. Within a preset time period The step size of the sliding window at any given time. To adjust the step size of the preset sliding window, Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. This is the preset DC current difference value.

[0058] Furthermore, the processor can also determine the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference in the window. Regardless of whether the DC shock current occurs in the constant current stage or the constant voltage stage, there is always a nonlinear incremental signal of DC shock current when a DC shock occurs. Combining this with the characteristic law of DC shock current, the DC shock current can be extracted. Depending on the current charging conditions of different DC charging piles, the DC line current may exhibit a constant current, increasing current, or decreasing current pattern. Therefore, the processor can pre-determine the magnitude of the DC current difference in the window relative to zero. If the DC current difference in the window is greater than or equal to zero, it indicates that the current operating condition of the DC power distribution equipment is an increasing current condition. At this time, the processor can determine the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the first preset DC shock current algorithm and the DC current difference in each window. The first preset DC shock current algorithm can be determined by the following formula:

[0059] in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. The first preset current difference threshold is set.

[0060] When the DC current difference is less than zero, it indicates that the current operating condition of the DC power distribution equipment is a decreasing condition. The processor can determine the DC current of the DC power distribution equipment within a preset time period under the current operating condition based on the second preset DC current algorithm and the DC current difference of each window. The second preset DC current algorithm can be determined by the following formula:

[0061] in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. This refers to the DC current difference value within the first window of a preset time period under the current operating conditions. This refers to the DC current difference value for the second window within a preset time period under the current operating conditions. This refers to the DC current difference value within the nth window of a preset time period under the current operating conditions. The second preset current difference threshold is defined as n, where n is the number of DC current differences within the window. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. .

[0062] The embodiments of this application can accurately identify and extract DC electric shock current, facilitating DC electric shock identification and effectively improving personal safety. Furthermore, the technical solution of this application has a wide range of applications, suitable for extracting DC electric shock current from DC power distribution equipment under different operating conditions in DC IT / TN grounding systems. In addition, the implementation method of the technical solution of this application is simple, requires minimal computation, and is easy to implement in engineering applications.

[0063] This application also provides an apparatus for determining the DC electric shock current of a DC power distribution device, comprising: a memory configured to store instructions; and a processor configured to retrieve instructions from the memory and, when executing the instructions, to implement the method for determining the DC electric shock current of a DC power distribution device as described above.

[0064] This application also provides a DC power distribution device, including: a device for determining the DC electric current of a DC power distribution device as described above.

[0065] This application also provides a machine-readable storage medium storing instructions for causing a machine to execute the method described above for determining the DC contact current of a DC power distribution device.

[0066] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0067] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0068] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0069] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0070] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0071] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0072] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0073] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0074] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for determining the DC electric shock current in DC power distribution equipment, characterized in that, The determination method includes: Obtain the DC current of multiple lines of DC power distribution equipment within a preset time period under current operating conditions; Determine the DC current of multiple window lines corresponding to every two adjacent sliding windows among the multiple line DC currents; Determine multiple differences between multiple window DC currents corresponding to each pair of adjacent sliding windows to obtain multiple window DC current differences of the DC power distribution equipment within a preset time period under the current operating condition; Based on the DC current difference values ​​of multiple windows, the DC electric shock current of the DC power distribution equipment within a preset time period under the current operating conditions is determined.

2. The method according to claim 1, characterized in that, The step of determining the DC electric shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference values ​​of multiple windows includes: When the difference between the DC currents in each window is greater than or equal to zero, the DC current of the DC power distribution equipment in the current operating condition within a preset time period is determined based on the difference between the DC currents in each window, according to the first preset DC current algorithm. When the difference between each DC current is less than zero, the DC current of the DC power distribution equipment under the current operating condition within a preset time period is determined based on the second preset DC current algorithm and the difference between each window DC current.

3. The method according to claim 2, characterized in that, The method of determining the DC shock current of the DC power distribution equipment within a preset time period under the current operating condition based on the DC current difference of each window, according to the first preset DC shock current algorithm, includes: in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. The first preset current difference threshold is set.

4. The method according to claim 2, characterized in that, The method based on the second preset DC shock current algorithm, which determines the DC shock current of the DC power distribution equipment within a preset time period under the current operating conditions based on the DC current difference of each window, includes: in, Let be the i-th DC shock current corresponding to the difference between the DC current of the DC distribution equipment and the DC current of the i-th window within a preset time period under the current operating conditions. This refers to the DC current difference value within the first window of a preset time period under the current operating conditions. This refers to the DC current difference value for the second window within a preset time period under the current operating conditions. This refers to the DC current difference value within the nth window of a preset time period under the current operating conditions. The second preset current difference threshold is defined as n, where n is the number of DC current differences within the window. Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. .

5. The method according to claim 1, characterized in that, The method for determining the step size of the sliding window includes: in, Within a preset time period The step size of the sliding window at any given time. This is the minimum preset window step size. This is the maximum preset window step size. Within a preset time period The step size of the sliding window at any given time. To adjust the step size of the preset sliding window, Let be the DC current difference value of the DC distribution equipment in the i-th window within a preset time period under the current operating conditions. This is the preset DC current difference value.

6. The method according to claim 1, characterized in that, The determination method further includes: The initial line DC current of the DC power distribution equipment under the current operating conditions within a preset time period is preprocessed to obtain multiple line DC currents.

7. The method according to claim 6, characterized in that, The preprocessing of the initial line DC current of the DC power distribution equipment within a preset time period under the current operating conditions to obtain multiple line DC currents includes: Based on the minimum mean square error filtering algorithm, the initial line DC current of the DC power distribution equipment within a preset time period under the current operating conditions is preprocessed to obtain multiple line DC currents.

8. A device for determining the DC electric shock current of DC power distribution equipment, characterized in that, include: The memory is configured to store instructions; as well as A processor is configured to retrieve the instructions from the memory and, when executing the instructions, to implement the method for determining DC electric shock current for DC power distribution equipment according to any one of claims 1 to 7.

9. A DC power distribution device, characterized in that, include: The device for determining DC electric shock current for DC power distribution equipment according to claim 8.

10. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform a method for determining the DC electric shock current for a DC power distribution device according to any one of claims 1 to 7.

Images