Compensation determination method and device and direct current charging pile calibrating device

Abstract

The invention discloses a compensation determination method and device and a direct current charging pile calibrating device. The method comprises the following steps: acquiring measured current values corresponding to a plurality of standard current values in the working process of the direct current charging pile; difference values between the standard current values and the corresponding measured current values are calculated, and current compensation values corresponding to the standard current values are obtained; and determining a corresponding relation between the current compensation values and the standard current values according to the plurality of standard current values and the respective corresponding current compensation values. According to the invention, the technical problem that the metering precision in a wide current range cannot reach a high standard due to hardware performance limitation and cost limitation is solved.

Description

Technical Field

[0001] The present invention relates to the field of DC charging pile measurement and verification, and in particular to a compensation determination method, device and a DC charging pile verification device. Background Art

[0002] With the popularity of electric vehicles and the rapid development of the charging pile industry, ensuring the accurate metering performance of charging piles has become a key factor in promoting the healthy development of the electric vehicle industry. In particular, DC charging piles are becoming more and more popular because they can provide fast charging services. However, due to the wide operating voltage range (180V~750V) and current range (1A~250A) of DC charging piles, traditional metrology and verification technologies face challenges, especially the difficulty of achieving high-precision (0.5 ten-thousandths) measurement within a wide range.

[0003] A common solution at present is to calibrate at a specific voltage and current point. However, the limitation of this calibration method is that it can only guarantee the measurement accuracy at this specific point. In the current range of 1A to 30A and 100A to 250A, the measurement accuracy will drop significantly, and the maximum error can reach 0.4%, which cannot meet the high-precision measurement requirements within the entire wide range. Another improvement is to use a high-precision, wide-range current transformer and upgrade the hardware to match higher accuracy requirements. Although this solution can theoretically improve the measurement accuracy and cover a wider current range, in actual operation, the high-precision transformer is large in size and difficult to integrate, which is not conducive to the miniaturization design of the measurement and verification device. At the same time, the cost is significantly increased, reducing the overall economic benefits.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a compensation determination method, device and DC charging pile calibration device to at least solve the technical problem that the measurement accuracy in a wide current range cannot reach a high standard due to hardware performance limitations and cost limitations.

[0006] According to one aspect of an embodiment of the present invention, a compensation determination method is provided, including: obtaining measured current values ​​corresponding to multiple standard current values ​​during the operation of a DC charging pile; calculating the difference between the multiple standard current values ​​and the respectively corresponding measured current values ​​to obtain current compensation values ​​corresponding to the multiple standard current values; and determining the correspondence between the current compensation value and the standard current value based on the multiple standard current values ​​and the respectively corresponding current compensation values.

[0007] Optionally, the measured current values ​​corresponding to each of the multiple standard current values ​​during the operation of the DC charging pile are obtained, including: reading the current signal values ​​corresponding to each of the multiple standard current values ​​in the working states corresponding to each of the multiple standard current values ​​respectively; and calculating the measured current values ​​corresponding to each of the multiple standard current values ​​based on the current signal values ​​corresponding to each of the multiple standard current values.

[0008] Optionally, a functional relationship between the current compensation value and the standard current value is determined based on multiple standard current values ​​and their corresponding current compensation values, including: determining a curve relationship between the current compensation value and the standard current value based on multiple standard current values ​​and their corresponding current compensation values; determining a function type corresponding to the function relationship and segmenting the curve based on the curve relationship; determining coefficients of the function relationship corresponding to each of the multiple curve segments based on the function type; determining the function relationship between the current compensation value corresponding to each of the multiple curve segments and the standard current value based on the coefficients of the function relationship corresponding to each of the multiple curve segments.

[0009] Optionally, the plurality of standard current values ​​are within a range of 1A to 250A.

[0010] Optionally, obtain a standard current value of the DC charging pile in the current working state; determine a current compensation value corresponding to the standard current value based on the standard current value and a functional relationship between the current compensation value and the standard current value; and adjust the measured current value in the current working state based on the current compensation value.

[0011] According to another aspect of an embodiment of the present invention, a DC charging pile verification device is provided, including: a calibration module and a metering module. The DC charging pile verification device applies the above compensation determination method.

[0012] According to another aspect of an embodiment of the present invention, a compensation determination device is also provided, including: an acquisition module, used to obtain measured current values ​​corresponding to multiple standard current values ​​during the operation of a DC charging pile; a calculation module, used to calculate the difference between multiple standard current values ​​and the corresponding measured current values, and obtain current compensation values ​​corresponding to the multiple standard current values; a determination module, used to determine the correspondence between the current compensation value and the standard current value based on multiple standard current values ​​and the corresponding current compensation values.

[0013] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above compensation determination methods.

[0014] According to yet another aspect of an embodiment of the present invention, a computer device is provided. The computer device includes a processor, and the processor is used to run a program. When the program is run, any one of the above compensation determination methods is executed.

[0015] According to yet another aspect of an embodiment of the present invention, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, any one of the above compensation determination methods is implemented.

[0016] In an embodiment of the present invention, a compensation determination method is adopted, by obtaining the measured current values ​​corresponding to each of the multiple standard current values ​​during the operation of the DC charging pile; calculating the difference between the multiple standard current values ​​and the respectively corresponding measured current values, and obtaining the current compensation values ​​corresponding to each of the multiple standard current values; according to the multiple standard current values ​​and the respectively corresponding current compensation values, determining the correspondence between the current compensation value and the standard current value, thereby achieving the purpose of optimizing the measurement accuracy of the DC charging pile calibration device, thereby achieving the technical effect of maintaining a high-precision measurement level within a wide current range, and further solving the technical problem that the measurement accuracy within a wide current range cannot reach a high standard due to hardware performance limitations and cost limitations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A hardware structure block diagram of a computer terminal for implementing a compensation determination method is shown;

[0019] Figure 2 is a flow chart of a compensation determination method provided according to an embodiment of the present invention;

[0020] Figure 3 is a flow chart of a pre-calibration method provided according to an optional embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the relationship between the error before compensation and the standard current provided in an optional embodiment of the present invention;

[0022] Figure 5 is a curve relationship diagram of a current compensation value and a standard current value provided according to an optional embodiment of the present invention;

[0023] Figure 6 is a comparison diagram of errors before and after compensation within a range of 100A to 250A provided according to an optional embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of a calibration compensation method provided according to an optional embodiment of the present invention;

[0025] Figure 8is a flow chart of a calibration compensation method provided according to an optional embodiment of the present invention;

[0026] Fig. 9 is a comparison diagram of errors before and after compensation within a wide range provided by an optional embodiment of the present invention;

[0027] Fig.10 is a structural block diagram of a compensation determination device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] According to an embodiment of the present invention, a method embodiment of compensation determination is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0031] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 FIG. 1 shows a hardware structure block diagram of a computer terminal for implementing a compensation determination method. Figure 1As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0032] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0033] The memory 104 can be used to store software programs and modules of application software, such as program instructions / data storage devices corresponding to the compensation determination method in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the compensation determination method of the above-mentioned application program is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0034] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0035] Figure 2 is a flow chart of a compensation determination method provided according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0036] Step S201, obtaining measured current values ​​corresponding to a plurality of standard current values ​​during operation of the DC charging pile.

[0037] In this step, first, a series of standard current values ​​can be set within the normal working range of the DC charging pile. These values ​​should be evenly distributed in the full range of 1A to 250A. For example, they can be set to 1A, 10A, 30A, 50A, 100A, 150A, 200A, 250A, etc., to ensure that all key points from minimum to maximum current are covered. Then, different charging conditions can be simulated on the charging pile measurement and verification device, that is, different standard voltage and current values ​​can be set to put the device in the corresponding working state, and measurements can be performed to obtain the measured current value.

[0038] In addition, before executing the method provided in the embodiment of the present invention, a pre-calibration may be performed. Figure 3 is a flow chart of a pre-calibration method according to an optional embodiment of the present invention. Figure 3 As shown, the pre-calibration can be based on the current calibration technology, and only calibrate at one voltage and current point, for example, I1 is 100A, U1 is 750V, and the relationship between the standard value and the actual measured value is compared at a specific voltage and current point to calculate the calibration parameters. The calibration parameters can be the gain and offset used to adjust the voltage and current measurement accuracy. The calibration device can be optimized based on the calibration parameters. The calculated calibration parameters need to be written into the specific registers of the metering chip for subsequent measurement. In actual measurement, the calibration device will automatically apply these calibration parameters to correct the measured value. After pre-calibration, that is, before executing the compensation determination method of the embodiment of the present invention, the calibration device still has errors. Figure 4 is a schematic diagram of the relationship between the error before compensation and the standard current according to an optional embodiment of the present invention, such as Figure 4 As shown, after pre-calibration, the measurement accuracy of 0.5% in the wide range of 1A to 250A still cannot be achieved. The measurement accuracy of 0.5% in the range of 30A to 100A can be met, but the measurement level requirement of 0.5% in the current range of 1A to 30A and 100A to 250A cannot be met, and the maximum error can reach 0.4%.

[0039] Step S202, calculating the difference between a plurality of standard current values ​​and the respective corresponding measured current values, and obtaining the current compensation values ​​corresponding to the plurality of standard current values.

[0040] In this step, for each collected data point, the difference between the standard current value and the measured current value is calculated as the current compensation value. The calculation formula of the current compensation value is: current compensation value = standard current value - measured current value. This difference intuitively reflects the deviation between the measured value and the standard value of the measurement and verification device at a specific current point. Further analysis can be performed to identify the law between the current compensation value and the standard current value. For example, Table 1 is a statistical table of the error situation under large current conditions and the current size that needs to be compensated. As shown in Table 1, tests were carried out under standard currents of 100A, 130A, 150A, 180A, 200A, 230A and 250A, and the corresponding error percentages, actual currents, that is, the measured current values ​​and the currents that need to be compensated were obtained.

[0041]

[0042]

[0043] Table 1 Statistics of errors under high current conditions and currents that need to be compensated

[0044] Step S203, determining a correspondence between the current compensation value and the standard current value according to a plurality of standard current values ​​and their corresponding current compensation values.

[0045] In this step, the multiple standard current values ​​collected in the previous simulation process can be sorted out with the current compensation values ​​corresponding to each other, and the sorted data can be analyzed. For example, a scatter plot can be drawn to observe the relationship between the current compensation value and the standard current value. Through graphical display, the linear, nonlinear or other mathematical relationships that may exist between the two can be intuitively found. Based on the results of data analysis, a suitable mathematical model is selected to describe the corresponding relationship between the current compensation value and the standard current value. After determining the mathematical model and coefficients, the model can be verified to check the accuracy of its predicted compensation value under different current values. If there is a significant deviation between the compensation value predicted by the model and the actual required compensation value, the model parameters should be adjusted and optimized until the model can accurately reflect the relationship between the current compensation value and the standard current value.

[0046] Through the above steps, the purpose of optimizing the measurement accuracy of the DC charging pile calibration device is achieved, thereby realizing the technical effect of maintaining a high-precision measurement level within a wide current range, and further solving the technical problem that the measurement accuracy within a wide current range cannot reach a high standard due to hardware performance limitations and cost limitations.

[0047] As an optional embodiment, the measured current values ​​corresponding to multiple standard current values ​​of the DC charging pile during operation are obtained, including: reading the current signal values ​​corresponding to the multiple standard current values ​​in the working states corresponding to the multiple standard current values ​​respectively; and calculating the measured current values ​​corresponding to the multiple standard current values ​​based on the current signal values ​​corresponding to the multiple standard current values.

[0048] Optionally, the current sensor can read the actual current flowing through and convert the analog signal into a digital signal, i.e., the current signal value, through an ADC (analog-to-digital converter). After reading the current signal value, the digital signal processing unit (DSP) or microprocessor of the metrology verification device will perform a series of calculation operations to extract the measured current value from these digital signals. The calculation of the measured current value usually depends on the characteristics of the current metering chip, the conversion accuracy of the ADC, and the design of the internal circuit.

[0049] As an optional embodiment, the functional relationship between the current compensation value and the standard current value is determined according to multiple standard current values ​​and their corresponding current compensation values, including: determining the curve relationship between the current compensation value and the standard current value according to the multiple standard current values ​​and their corresponding current compensation values; determining the function type corresponding to the functional relationship and segmenting the curve according to the curve relationship; determining the coefficients of the functional relationship corresponding to each of the multiple curve segments based on the function type; determining the functional relationship between the current compensation value corresponding to each of the multiple curve segments and the standard current value based on the coefficients of the functional relationship corresponding to each of the multiple curve segments.

[0050] Optionally, the collected multiple standard current values ​​and their corresponding current compensation values ​​can be plotted as a curve to form a visual relationship diagram between the current compensation value and the standard current value. To observe the drawn compensation curve, a piecewise linear fitting method can be used, that is, the curve is divided into several sections according to its shape and characteristics. The current compensation value in each section is considered to follow a functional relationship with the standard current value. Compared with the traditional use of a single high-order polynomial function to fit the error characteristics of the full range, the piecewise fitting can more accurately reflect the error variation law of different current intervals, especially when the error characteristics show different relationships in different current intervals. The advantages of this method are more obvious. For each segmented function, the coefficients of the functional relationship are calculated using appropriate statistical methods. This process can be automatically completed by software algorithms, such as C language, which improves calculation efficiency and accuracy compared to manual calculations.

[0051] Among them, in the process of determining the coefficients of the functional relationship, it can be implemented based on the least squares method. In each curve segment, the function model can first be set to y=ax+b, where y is the dependent variable current compensation value, x is the independent variable standard current value, and a and b are the coefficients to be determined, and then estimated by the least squares method. For each data point in each curve segment, the difference between the predicted value and the actual value of the function model is calculated, that is, the residual, and then all the residuals are squared and summed to obtain the residual sum of squares (RSS). By minimizing the residual sum of squares RSS, the coefficients a and b of the model can be estimated. The principle of calculus can usually be used, that is, the partial derivatives of RSS with respect to a and b are calculated, and the partial derivatives are set equal to zero, so as to solve the optimal a and b.

[0052] For example, Figure 5 is a curve relationship diagram of a current compensation value and a standard current value provided according to an optional embodiment of the present invention, such as Figure 5 As shown, the curve is closest to a linear function, and it can be observed that the dividing points are the standard current values ​​of 150A and 200A. The coefficients can be calculated using C language to obtain the relationship between the three fitting curves: 100-150A is y=0.001664x-0.1872, 150-200A is y=0.005404x-0.7482, and 200-250A is y=0.010648x-1.797. According to the three fitted segmented functions, the compensation current fitting value and the error after compensation can be calculated. Table 2 is a statistical table of the compensation current fitting value and the error value after compensation under high current conditions. As shown in Table 2, the error is greatly reduced after compensation, and Figure 6 is a comparison diagram of errors before and after compensation within a range of 100A to 250A provided according to an optional embodiment of the present invention, such as Figure 6 As shown, the compensation scheme controls the error within the current range of 100 to 250 A to within 0.05%.

[0053]

[0054]

[0055] Table 2 Statistics of compensation current fitting value and error value after compensation under high current condition

[0056] As an optional embodiment, the plurality of standard current values ​​are within a range of 1A to 250A.

[0057] Optionally, the charging current of the DC charging pile can vary from small to large, covering a range from 1A to 250A. By setting multiple standard current values ​​within this wide current range, the present invention can comprehensively evaluate the performance of the measurement and verification device under various actual working conditions, ensuring that the device can provide accurate measurement results regardless of whether it is light load or full load charging. In contrast, the alternative method of calibrating only at a specific current point or within a smaller range may not fully reflect the error characteristics of the metering device within a wide current range, resulting in the inability to guarantee the measurement accuracy under certain working conditions.

[0058] As an optional embodiment, a standard current value of a DC charging pile in a current working state is obtained; a current compensation value corresponding to the standard current value is determined based on the standard current value and a functional relationship between the current compensation value and the standard current value; and a measured current value in the current working state is adjusted based on the current compensation value.

[0059] Optionally, in the real-time metering process, the metrology verification device can first obtain the standard current value of the DC charging pile in the current working state. This current value is provided by the host computer or other external standard equipment to ensure the benchmark accuracy of the measurement. The acquisition of the standard current value is the starting point of error compensation, which is directly related to the calculation of the subsequent compensation value and the adjustment of the measurement results. Based on the previously established functional relationship between the current compensation value and the standard current value, the metrology verification device can calculate the current compensation value corresponding to the current standard current value in real time. This functional relationship is established in the early calibration process by analyzing multiple standard current values ​​and their corresponding measurement errors, using methods such as segmented fitting, to ensure the accuracy and pertinence of error compensation in a wide current range. After obtaining the current compensation value, the metrology verification device adjusts the current value currently measured, dynamically corrects the measurement error, and ensures that even in the case of current fluctuations or equipment aging, the measurement result can be maintained within a high-precision level of 50,000ths.

[0060] An embodiment of the present invention further provides a DC charging pile verification device, comprising a calibration module and a metering module. The DC charging pile verification device applies the above compensation determination method.

[0061] Optionally, the calibration module is the key part responsible for determining the functional relationship between the current compensation value and the standard current value during the initialization phase or regular calibration process of the DC charging pile measurement and verification device. It can receive and set multiple standard current values ​​through communication with external standard equipment, read the current signal value under different working conditions, and then calculate the measured current value. The core function of the calibration module is to analyze the difference between the measured current value and the standard current value, establish an error model, calculate the functional relationship between the compensation value and the standard current, and provide an accurate error compensation basis for the subsequent measurement process. The metering module applies the functional relationship calculated by the calibration module in the actual measurement process to correct the error of the measurement result. When the DC charging pile is charging, the metering module reads the standard current in real time, and uses the piecewise functional relationship provided by the calibration module to calculate the corresponding error compensation value, and adjusts the current measured current value.

[0062] As an optional embodiment, Figure 7 is a schematic diagram of a calibration compensation method provided according to an optional embodiment of the present invention. Figure 7 As shown, the current analog signal and voltage analog signal obtained by the sensor are input into the metering chip of the calibration device, and are first converted by A / D, wherein the voltage error can be basically ignored. Therefore, in order to ensure the accuracy of the final effective power value, only the error of the current value needs to be calibrated. The compensation value can be calculated based on the error influence of the current, wherein the error influence can be the hardware error of the device itself, or the sensor measurement error caused by the environment. The current value is calibrated by the calculated bias compensation value, and finally the effective power value is calculated using the calibrated current value and voltage value, and the result is output.

[0063] As an optional embodiment, Figure 8 FIG. 1 is a flow chart of a calibration compensation method according to an optional embodiment of the present invention. Figure 8 As shown, the calibration phase is first performed, and pre-calibration can be performed, that is, a calibration parameter is first calculated using a specific voltage and current, and written into the register of the metering chip for pre-calibration in subsequent measurements. Then select several iconic points in the current range of 1A to 250A for measurement, and obtain the metering error, measured current and standard current, where the metering error refers to the error percentage. Then start modeling to determine the relationship between the compensation value and the standard current value, where the coefficients of the function relationship can be calculated by C language, and finally the determined function relationship is stored for use in the subsequent metering phase. In the metering stage, the coefficients in the stored function relationship are retrieved in real time according to the standard current value, and the compensation value is calculated and updated to the compensation register. Fig. 9 is a comparison diagram of errors before and after compensation within a wide range according to an optional embodiment of the present invention, such as Fig. 9As shown, in the 0A to 100A stage, the errors before and after compensation are not much different and are basically the same, but in the 100A to 250A stage, the error after compensation is significantly smaller than the error before compensation, indicating that the calibration error compensation method provided by the present invention has greatly optimized the measurement accuracy. In addition, the method has good applicability, simple and efficient operation, and can be used normally by different DC charging pile measurement and verification device entities, and the algorithm does not need special processing for special individuals.

[0064] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0065] Through the description of the above implementation methods, those skilled in the art can clearly understand that the compensation determination method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0066] According to an embodiment of the present invention, a device for implementing the above compensation determination method is also provided. Fig.10 is a structural block diagram of a compensation determination device provided according to an embodiment of the present invention. Fig.10 As shown, the device includes: an acquisition module 1001, a calculation module 1002 and a determination module 1003. The device is described below.

[0067] The acquisition module 1001 is used to obtain the measured current values ​​corresponding to the multiple standard current values ​​of the DC charging pile during operation.

[0068] The calculation module 1002 is connected to the acquisition module 1001 and is used to calculate the difference between the multiple standard current values ​​and the corresponding measured current values, so as to obtain the current compensation values ​​corresponding to the multiple standard current values.

[0069] The determination module 1003 is connected to the calculation module 1002 and is used to determine the corresponding relationship between the current compensation value and the standard current value according to a plurality of standard current values ​​and their corresponding current compensation values.

[0070] It should be noted that the acquisition module 1001, the calculation module 1002 and the determination module 1003 correspond to steps S201 to S203 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run in the computer terminal 10 provided in the embodiment.

[0071] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one network device among multiple network devices of a computer network. The computer device includes a memory and a processor.

[0072] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the compensation determination method and device in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, the above-mentioned compensation determination method is realized. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include a memory remotely arranged relative to the processor, and these remote memories can be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0073] The processor can call the information and application programs stored in the memory through the transmission device to execute the following steps: obtain the measured current values ​​corresponding to multiple standard current values ​​during the operation of the DC charging pile; calculate the difference between the multiple standard current values ​​and the corresponding measured current values ​​to obtain the current compensation values ​​corresponding to the multiple standard current values; determine the correspondence between the current compensation value and the standard current value based on the multiple standard current values ​​and the corresponding current compensation values.

[0074] Optionally, the processor may also execute program code for the following steps: obtaining measured current values ​​corresponding to multiple standard current values ​​of the DC charging pile during operation, including: reading current signal values ​​corresponding to multiple standard current values ​​in the respective working states corresponding to the multiple standard current values; and calculating measured current values ​​corresponding to multiple standard current values ​​based on current signal values ​​corresponding to the multiple standard current values.

[0075] Optionally, the processor may also execute program code for the following steps: determining a functional relationship between a current compensation value and a standard current value based on a plurality of standard current values ​​and their respective corresponding current compensation values, including: determining a curve relationship between the current compensation value and the standard current value based on a plurality of standard current values ​​and their respective corresponding current compensation values; determining a function type corresponding to the function relationship and segmenting the curve based on the curve relationship; determining coefficients of function relationship expressions corresponding to each of the plurality of curve segments based on the function type; determining function relationship expressions between the current compensation values ​​corresponding to each of the plurality of curve segments and the standard current value based on the coefficients of the function relationship expressions corresponding to each of the plurality of curve segments.

[0076] Optionally, the processor may also execute program code of the following steps: a plurality of standard current values ​​are within a range of 1A to 250A.

[0077] Optionally, the processor may also execute the program code of the following steps: obtaining the standard current value of the DC charging pile in the current working state; determining the current compensation value corresponding to the standard current value based on the functional relationship between the standard current value and the current compensation value and the standard current value; and adjusting the measured current value in the current working state based on the current compensation value.

[0078] By adopting the embodiment of the present invention, a compensation determination method is provided, which obtains the measured current value corresponding to each of the multiple standard current values ​​during the operation of a DC charging pile; calculates the difference between the multiple standard current values ​​and the respectively corresponding measured current values, and obtains the current compensation value corresponding to each of the multiple standard current values; determines the correspondence between the current compensation value and the standard current value according to the multiple standard current values ​​and the respectively corresponding current compensation values, thereby achieving the purpose of optimizing the measurement accuracy of a DC charging pile calibration device, thereby realizing the technical effect of maintaining a high-precision measurement level within a wide current range, and further solving the technical problem that the measurement accuracy within a wide current range cannot reach a high standard due to hardware performance limitations and cost limitations.

[0079] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0080] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the compensation determination method provided in the above embodiment.

[0081] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0082] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: obtaining measured current values ​​corresponding to multiple standard current values ​​of the DC charging pile during operation; calculating the difference between multiple standard current values ​​and the corresponding measured current values ​​to obtain current compensation values ​​corresponding to the multiple standard current values; and determining the correspondence between the current compensation value and the standard current value based on the multiple standard current values ​​and the corresponding current compensation values.

[0083] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: obtaining measured current values ​​corresponding to multiple standard current values ​​of the DC charging pile during operation, including: reading current signal values ​​corresponding to multiple standard current values ​​in the working states corresponding to the multiple standard current values ​​respectively; calculating measured current values ​​corresponding to multiple standard current values ​​based on the current signal values ​​corresponding to the multiple standard current values.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: determining a functional relationship between a current compensation value and a standard current value based on multiple standard current values ​​and their corresponding current compensation values, including: determining a curve relationship between the current compensation value and the standard current value based on multiple standard current values ​​and their corresponding current compensation values; determining a function type corresponding to the function relationship and segmenting the curve based on the curve relationship; determining coefficients of function relationship expressions corresponding to each of the multiple curve segments based on the function type; determining function relationship expressions between the current compensation values ​​corresponding to each of the multiple curve segments and the standard current value based on the coefficients of the function relationship expressions corresponding to each of the multiple curve segments.

[0085] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: a plurality of standard current values ​​are within a range of 1A to 250A.

[0086] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: obtaining the standard current value of the DC charging pile in the current working state; determining the current compensation value corresponding to the standard current value based on the standard current value and the functional relationship between the current compensation value and the standard current value; and adjusting the measured current value in the current working state based on the current compensation value.

[0087] An embodiment of the present invention also provides a computer program product, including a computer program. Optionally, in this embodiment, when the computer program is executed by a processor, it can achieve: obtaining measured current values ​​corresponding to multiple standard current values ​​during the operation of a DC charging pile; calculating the difference between multiple standard current values ​​and the corresponding measured current values ​​to obtain current compensation values ​​corresponding to multiple standard current values; and determining the correspondence between the current compensation values ​​and the standard current values ​​based on the multiple standard current values ​​and the corresponding current compensation values.

[0088] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0089] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0092] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0093] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0094] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A compensation determination method, characterized in that: include: Obtaining the measured current values ​​corresponding to multiple standard current values ​​of the DC charging pile during operation; Calculating the differences between the plurality of standard current values ​​and the respective corresponding measured current values ​​to obtain the current compensation values ​​respectively corresponding to the plurality of standard current values; According to the multiple standard current values ​​and the respective corresponding current compensation values, a corresponding relationship between the current compensation value and the standard current value is determined.

2. The method according to claim 1, characterized in that The step of obtaining the measured current values ​​corresponding to the multiple standard current values ​​of the DC charging pile during operation includes: Reading current signal values ​​corresponding to the plurality of standard current values ​​respectively under the working states corresponding to the plurality of standard current values ​​respectively; Based on the current signal values ​​corresponding to each of the plurality of standard current values, the measured current values ​​corresponding to each of the plurality of standard current values ​​are calculated.

3. The method according to claim 1, characterized in that The step of determining a functional relationship between the current compensation value and the standard current value according to the plurality of standard current values ​​and the corresponding current compensation values ​​comprises: Determining a curve relationship between the current compensation value and the standard current value according to the multiple standard current values ​​and the respective corresponding current compensation values; According to the curve relationship, determining the function type corresponding to the functional relationship and segmenting the curve; Based on the function type, determining coefficients of functional relationship expressions corresponding to the plurality of curve segments; Based on the coefficients of the functional relationship expressions corresponding to the plurality of curve segments, the functional relationship expressions between the current compensation values ​​corresponding to the plurality of curve segments and the standard current values ​​are determined.

4. The method according to any one of claims 1 to 3, characterized in that The multiple standard current values ​​are within the range of 1A to 250A.

5. The method according to any one of claims 1 to 3, characterized in that: include: Obtaining a standard current value of the DC charging pile in a current working state; Determining a current compensation value corresponding to the standard current value based on the standard current value and a functional relationship between the current compensation value and the standard current value; Based on the current compensation value, the measured current value in the current working state is adjusted.

6. A DC charging pile calibration device, characterized in that: Comprising a calibration module and a metering module, the DC charging pile verification device applies the compensation determination method described in any one of claims 1 to 5.

7. A compensation determination device, characterized in that: include: An acquisition module is used to obtain the measured current values ​​corresponding to multiple standard current values ​​of the DC charging pile during operation; A calculation module, used for calculating the difference between the plurality of standard current values ​​and the respective corresponding measured current values, to obtain the current compensation value corresponding to the plurality of standard current values; The determination module is used to determine the corresponding relationship between the current compensation value and the standard current value according to the multiple standard current values ​​and the corresponding current compensation values.

8. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the compensation determination method according to any one of claims 1 to 5.

9. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is run, the processor executes the compensation determination method according to any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the compensation determination method according to any one of claims 1 to 5 is implemented.

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