Direct current charging pile metering error detection method and system

Abstract

The invention discloses a direct-current charging pile metering error detection method and system. The method comprises the steps that the total power supply amount of the alternating-current sides of a plurality of charging piles and the charging amount of the corresponding charging piles are collected; collecting power supply power of alternating current sides of a plurality of charging piles and charging power of the charging piles; obtaining final conversion efficiency based on the power supply power and the charging power; obtaining conversion loss power consumption of the charging pile based on the final conversion efficiency and the total power supply quantity; collecting the alternating current side power supply quantity of the charging pile in a plurality of metering periods in the standby state of the previous day; obtaining the standby loss of the charging pile based on the AC side power supply amount; and obtaining a final metering error based on the total power supply amount, the charging amount, the conversion loss power amount and the standby loss according to the dynamic energy conservation of the charging pile. On the premise that normal operation is not affected, the metering error of the direct current charging pile is efficiently and accurately detected in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and more particularly to a method and system for detecting measurement errors of a DC charging pile. Background Art

[0002] In recent years, electric vehicles have developed rapidly as green transportation, and charging stations as supporting infrastructure have also expanded rapidly. Among these charging facilities, DC charging piles are widely used in public charging places due to their fast charging speed and high efficiency. However, DC charging piles may have measurement errors during actual operation, which not only affects the user experience, but may also cause economic losses to the operator.

[0003] At present, the detection of charging piles mainly relies on the on-site calibration system. This detection method has the following problems: 1. High cost: On-site calibration usually requires professional testing equipment and technicians, and the overall cost is relatively high; 2. Time-consuming: It takes a lot of time to detect each charging pile one by one, especially when there are a large number of charging piles, which is inefficient; 3. Low degree of automation: Traditional detection methods have a low degree of automation and it is difficult to achieve rapid detection of large-scale charging piles; 4. Incomplete data collection: Existing technologies make it difficult to comprehensively monitor various charging data (such as total active power, reactive power, etc.) and fault information of charging piles, resulting in the inability to conduct comprehensive analysis; 5. Complex transformation: In order to access the existing platform to achieve online monitoring, it is often necessary to carry out a lot of transformation work on the system interface, which increases the difficulty and cost of implementation.

[0004] A Chinese patent (CN113655304A) discloses an online detection system and method for the metering performance of an electric vehicle charger. It detects the metering error of the charging pile by adding a DC detection meter to the DC incoming line side of the charger. Although the above scheme can derive the metering error of the charging pile, it is necessary to install a DC detection meter in the charger; in actual operation, each charging pile needs to be modified, which is difficult and has high implementation costs. This patent establishes an energy conservation equation with the charging station as the smallest unit. The non-charging pile electricity (such as lighting and air conditioning) in the charging station is regarded as the inherent loss of the charging station. The time of each charging process is different, and the power consumption is not a fixed value. The metering error result calculated based on the fixed loss has a large error.

[0005] Therefore, how to detect the measurement error of the DC charging pile in real time, efficiently and accurately without affecting normal operation is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0006] In view of this, the present invention provides a DC charging pile metering error detection method and system, which can detect the metering error of the DC charging pile in real time, efficiently and accurately without affecting normal operation.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A DC charging pile measurement error detection method, comprising:

[0009] Collect the total power supply of multiple charging piles on the AC side and the charging capacity of their corresponding charging piles;

[0010] Collecting the power supply power of the AC side of the plurality of charging piles and the charging power of the charging piles;

[0011] Obtaining a final conversion efficiency based on the power supply and the charging power;

[0012] Obtaining conversion loss power of the charging pile based on the final conversion efficiency and the total power supply;

[0013] Collecting the AC side power supply of the charging pile in the standby state for multiple metering cycles on the previous day;

[0014] Obtaining the standby loss of the charging pile based on the AC side power supply;

[0015] Based on the total power supply, the charging amount, the conversion loss amount and the standby loss and according to the dynamic energy conservation of the charging pile, a final measurement error is obtained.

[0016] Preferably, the final conversion efficiency is obtained by:

[0017] Obtaining a plurality of conversion efficiencies based on all of the supply power and the charging power;

[0018] A scatter plot is obtained based on all the conversion efficiencies and the rated powers of the charging piles;

[0019] After eliminating abnormal data based on the scatter plot, a conversion efficiency curve is obtained;

[0020] Obtaining an inflection point based on the conversion efficiency curve;

[0021] Arbitrarily select a target charging power and a corresponding target power supply power that are greater than the inflection point;

[0022] The final conversion efficiency is obtained based on a ratio of the target charging power to the target supply power.

[0023] Preferably, the conversion efficiency calculation method is:

[0024]

[0025] Among them, η d represents the conversion efficiency, P c Indicates charging power, P g Indicates the power supply.

[0026] Preferably, the conversion loss power calculation method is:

[0027]

[0028] in, Indicates the conversion loss, η z represents the final conversion efficiency, Indicates the total power supply.

[0029] Preferably, the standby loss is obtained by:

[0030] Collecting the AC side power supply of the charging pile in a standby state for multiple metering cycles on the previous day to obtain multiple AC side power supplies;

[0031] An average value based on the multiple AC side power supplies is used as the standby loss.

[0032] Preferably, the standby loss calculation method is:

[0033]

[0034] in, represents standby loss, n represents the number of metering cycles, Indicates the power supply on the AC side.

[0035] Preferably, obtaining the final measurement error specifically includes:

[0036] Constructing a charging pile dynamic energy conservation equation based on all of the total power supply, the charging amount, the conversion loss amount and the standby loss to obtain a plurality of charging pile dynamic energy conservation equations;

[0037] A plurality of measurement errors are obtained based on solving the dynamic energy conservation equations of all the charging piles;

[0038] The final measurement error is obtained by taking an average value based on all the measurement errors after removing abnormal values.

[0039] Preferably, the dynamic energy conservation equation of the charging pile is specifically:

[0040]

[0041] Where k represents the number of charging guns in the charging state. represents the charge capacity, and ε represents the measurement error.

[0042] Preferably, it also includes:

[0043] Based on the comparison between the final measurement error and the set accuracy level table, the accuracy level of the internal meter of the charging pile is determined.

[0044] A DC charging pile metering error detection system, comprising: a data acquisition module, a conversion loss acquisition module, a standby loss acquisition module and a detection result output module;

[0045] The data acquisition module is used to collect the total power supply of the AC side of multiple charging piles and the charging amount of the corresponding charging piles; collect the power supply power of the AC side of multiple charging piles and the charging power of the charging piles;

[0046] The conversion loss acquisition module is used to obtain the final conversion efficiency based on the power supply power and the charging power; and obtain the conversion loss power of the charging pile based on the final conversion efficiency and the total power supply;

[0047] The standby loss acquisition module is used to collect the AC side power supply of the charging pile in the standby state of multiple metering cycles on the previous day; and obtain the standby loss of the charging pile based on the AC side power supply;

[0048] The detection result output module is used to obtain a final measurement error based on the total power supply, the charging amount, the conversion loss and the standby loss and according to the dynamic energy conservation of the charging pile.

[0049] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method and system for detecting a DC charging pile metering error, which has the following beneficial effects:

[0050] 1. The present invention can identify in real time and efficiently whether there is a metering mismatch in a DC charging pile without affecting normal operation, and can provide accurate diagnostic results so that timely measures can be taken for maintenance or adjustment.

[0051] 2. The present invention collects the charging power, power and other data of the charging facilities online and calculates the error of the pile internal meter in real time. There is no need to carry calibration and detection equipment to the site to check one by one whether there is any inaccuracy in the pile internal meter, thus saving a lot of manpower and material resources.

[0052] 3. The present invention establishes dynamic energy conservation with charging piles as the dimension, avoiding interference from other electrical equipment in the charging station, such as lighting, air conditioning, etc., and improving the calculation accuracy of the metering error in the pile.

[0053] 4. The present invention adopts the principle of dynamic energy conservation of charging piles to calculate the error of the pile internal meter, and combines the accuracy level of the pile internal meter to determine whether the meter error exceeds the tolerance. For pile internal meters with excessive errors, the charging station operation and maintenance personnel are promptly notified to replace them to avoid economic losses to the majority of charging users. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0055] Figure 1 A flow chart of a DC charging pile measurement error detection method provided by the present invention.

[0056] Figure 2 This is a schematic diagram of the topological relationship of equipment in the charging station provided by the present invention.

[0057] Figure 3 This is a scatter plot of conversion efficiency provided by the present invention.

[0058] Figure 4 A schematic diagram of the structure of a DC charging pile metering error detection system provided by the present invention.

[0059] Figure 5 This is a structural block diagram of the computer device provided by the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0061] Example 1

[0062] like Figure 1 As shown, the embodiment of the present invention discloses a DC charging pile measurement error detection method, comprising:

[0063] Collect the total power supply of multiple charging piles on the AC side and the charging capacity of their corresponding charging piles;

[0064] Collect the power supply power of the AC side of multiple charging piles and the charging power of the charging piles;

[0065] The final conversion efficiency is obtained based on the supply power and the charging power;

[0066] The conversion loss power of the charging pile is obtained based on the final conversion efficiency and the total power supply;

[0067] Collect the AC power supply of the charging pile in the standby state for multiple metering cycles on the previous day;

[0068] The standby loss of the charging pile is obtained based on the AC side power supply;

[0069] Based on the total power supply, charging amount, conversion loss and standby loss and according to the dynamic energy conservation of the charging pile, the final measurement error is obtained.

[0070] Example 2

[0071] The embodiment of the present invention discloses a method for detecting a DC charging pile metering error, comprising:

[0072] Collect the total power supply of multiple charging piles on the AC side and the charging capacity of their corresponding charging piles:

[0073] Preferably, this embodiment obtains multiple total power supplies and corresponding charging capacities by collecting the total power supply of the AC side of the charging pile and the charging capacity of the corresponding charging pile in multiple metering cycles.

[0074] Collect the power supply power of the AC side of multiple charging piles and the charging power of the charging piles:

[0075] Preferably, this embodiment collects the total power supply on the AC side of the charging pile by installing a separate rail meter (hereinafter referred to as "rail meter") at the AC incoming line of the DC charging pile; the rail meter serves as both a metering device and a collection device. As a metering device, the rail meter collects the total power supply on the AC input side of the DC charging pile and the power supply on the AC side of the charging pile; as a collection device, the rail meter collects data from the DC meter inside the DC charging pile (hereinafter referred to as "pile internal meter") used to measure and collect charging power.

[0076] Preferably, the guide rail meter has a precise measurement function to provide data for the system background misalignment model.

[0077] Preferably, this embodiment collects the charging amount and charging power of the charging pile measured by the meter inside the pile through the rail meter.

[0078] Preferably, when charging a single DC charging pile, multiple power supply powers and charging powers are collected at a set frequency through the rail meter. The set frequency in this embodiment is: once per minute.

[0079] Preferably, the topological relationship of the equipment in the charging station is as follows: Figure 2As shown in the figure, the total meter of the charging station under the transformer measures the power supply. For the split DC pile, the AC / DC converter is installed on the charger side, the rail meter is installed on the AC incoming line side of the charger, and the pile internal meter is associated with the charging gun to measure the charging amount, power, etc. For the integrated DC pile, the AC / DC converter is installed inside the DC pile.

[0080] The final conversion efficiency is obtained based on the supply power and charging power:

[0081] Preferably, the final conversion efficiency is obtained by:

[0082] Obtain multiple conversion efficiencies based on all supply powers and charging powers;

[0083] like Figure 3 As shown, a scatter plot is obtained based on all conversion efficiencies and charging pile rated powers;

[0084] After eliminating abnormal data based on the scatter plot, the conversion efficiency curve is obtained;

[0085] An inflection point is obtained based on the conversion efficiency curve;

[0086] Arbitrarily select a target charging power greater than the inflection point and a corresponding target power supply power;

[0087] The final conversion efficiency is obtained based on the ratio of the target charging power to the target supply power.

[0088] Preferably, the inflection point is a point in the conversion efficiency curve corresponding to a charging power within a range of 20% to 30% of the rated power of the charging pile. In this embodiment, a point in the conversion efficiency curve corresponding to a charging power equal to 25% of the rated power of the charging pile is selected as the inflection point.

[0089] Based on the conversion efficiency curve, any conversion efficiency corresponding to a charging power greater than 25% of the rated power of the charging pile is selected as the final conversion efficiency.

[0090] Preferably, the conversion efficiency is calculated as follows:

[0091]

[0092] Among them, η d represents the conversion efficiency, P c Indicates charging power, P g Indicates the power supply.

[0093] Preferably, the conversion efficiency is the AC / DC converter conversion efficiency.

[0094] Based on the final conversion efficiency and total power supply, the conversion loss of the charging pile is obtained:

[0095] Preferably, the charging loss power generated by the conversion efficiency of the DC pile AC / DC converter is the conversion loss power of the charging pile.

[0096] Preferably, the conversion loss power calculation method is:

[0097]

[0098] in, Indicates the conversion loss, η z represents the final conversion efficiency, Indicates the total power supply.

[0099] Collect the AC power supply of the charging pile in the standby state for multiple measurement cycles on the previous day:

[0100] Preferably, the standby power loss when the charging pile is not charging is the AC side power supply measured by the rail meter.

[0101] The standby loss of the charging pile is obtained based on the AC side power supply:

[0102] Preferably, the standby loss is obtained by:

[0103] Collect the AC side power supply of multiple metering cycles in the standby state of the charging pile on the previous day to obtain multiple AC side power supplies;

[0104] The standby loss is calculated by taking the average value of multiple AC side power supplies.

[0105] Preferably, the standby loss calculation method is:

[0106]

[0107] in, represents standby loss, n represents the number of metering cycles, Indicates the power supply on the AC side.

[0108] Based on the total power supply, charging amount, conversion loss and standby loss and according to the dynamic energy conservation of the charging pile, the final measurement error is obtained.

[0109] Preferably, obtaining the final measurement error specifically includes:

[0110] Based on all the total power supply, charging capacity, conversion loss and standby loss, a dynamic energy conservation equation of the charging pile is constructed to obtain multiple dynamic energy conservation equations of the charging pile;

[0111] Based on the solution of the dynamic energy conservation equations of all charging piles, multiple measurement errors are obtained;

[0112] The final measurement error is obtained by removing outliers and taking the average value based on all measurement errors.

[0113] Preferably, the dynamic energy conservation equation of the charging pile is specifically:

[0114]

[0115] Where k represents the number of charging guns in the charging state. represents the charge capacity, and ε represents the measurement error.

[0116] Preferably, based on multiple total power supplies and corresponding charging amounts collected from multiple metering cycles, multiple charging pile dynamic energy conservation equations are constructed in combination with the calculated conversion loss power and standby loss, and then multiple metering errors are solved. The final metering error is obtained by taking the average value after removing outliers from all metering errors, which is used as the metering error of the pile internal meter. By solving the metering errors of multiple metering cycles, removing outliers and taking the average value, the actual metering error of the pile internal meter can be accurately reflected.

[0117] Preferably, it also includes:

[0118] The accuracy level of the internal meter of the charging pile is determined by comparing the final measurement error with the set accuracy level table.

[0119] Preferably, the accuracy level of the pile-in-meter in the accuracy level table is divided into four levels, each level corresponds to a different error rate, and the corresponding accuracy level table based on different meter versions of the pile-in-meter is shown in Table 1:

[0120] Table 1 Accuracy levels corresponding to different meter versions

[0121]

[0122] Preferably, the accuracy level of the pile internal table is determined based on the final measurement error obtained and the corresponding version of the pile internal table is compared with the corresponding accuracy level table, and then it is judged whether it is inaccurate and whether it meets the actual needs. If the final measurement error is greater than the benchmark error threshold, it is determined that the pile internal table is inaccurate, otherwise it is not inaccurate.

[0123] Example 3

[0124] like Figure 4 As shown, a DC charging pile metering error detection system includes: a data acquisition module, a conversion loss acquisition module, a standby loss acquisition module and a detection result output module;

[0125] The data acquisition module is used to collect the total power supply of the AC side of multiple charging piles and the charging amount of the corresponding charging piles; collect the power supply power of the AC side of multiple charging piles and the charging power of the charging piles;

[0126] A conversion loss acquisition module is used to obtain the final conversion efficiency based on the power supply power and the charging power; and to obtain the conversion loss power of the charging pile based on the final conversion efficiency and the total power supply;

[0127] The standby loss acquisition module is used to collect the AC side power supply of the charging pile in the standby state for multiple metering cycles on the previous day; the standby loss of the charging pile is obtained based on the AC side power supply;

[0128] The detection result output module is used to obtain the final measurement error based on the total power supply, charging amount, conversion loss and standby loss and according to the dynamic energy conservation of the charging pile.

[0129] Preferably, the functions implemented by each functional module of this embodiment correspond one-to-one to the above method, and will not be described one by one here.

[0130] Example 4

[0131] Based on the same inventive concept, the present invention also provides a computer device, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0132] Memory, used to store computer programs;

[0133] The processor is used to implement a DC charging pile measurement error detection method as described in Embodiment 1 or 2 when executing a program stored in the memory.

[0134] like Figure 5 As shown, the electronic device may include: a processor 41, a communication interface 42, a memory 43 and a communication bus 44, wherein the processor 41, the communication interface 42 and the memory 43 communicate with each other through the communication bus 44. The processor 41 may call the logic instructions in the memory 43 to execute a DC charging pile measurement error detection method in Embodiment 1 or 2.

[0135] In addition, the logic instructions in the above-mentioned memory 43 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0136] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method and system for detecting a DC charging pile metering error, which has the following beneficial effects:

[0137] 1. The present invention can identify in real time and efficiently whether there is a metering mismatch in a DC charging pile without affecting normal operation, and can provide accurate diagnostic results so that timely measures can be taken for maintenance or adjustment.

[0138] 2. The present invention collects the charging power, power and other data of the charging facilities online and calculates the error of the pile internal meter in real time. There is no need to carry calibration and detection equipment to the site to check one by one whether there is any inaccuracy in the pile internal meter, thus saving a lot of manpower and material resources.

[0139] 3. The present invention establishes dynamic energy conservation with charging piles as the dimension, avoiding interference from other electrical equipment in the charging station, such as lighting, air conditioning, etc., and improving the calculation accuracy of the metering error in the pile.

[0140] 4. The present invention adopts the principle of dynamic energy conservation of charging piles to calculate the error of the pile internal meter, and combines the accuracy level of the pile internal meter to determine whether the meter error exceeds the tolerance. For pile internal meters with excessive errors, the charging station operation and maintenance personnel are promptly notified to replace them to avoid economic losses to the majority of charging users.

[0141] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0142] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC charging pile measurement error detection method, characterized in that: include: Collect the total power supply of multiple charging piles on the AC side and the charging capacity of their corresponding charging piles; Collecting the power supply power of the AC side of the plurality of charging piles and the charging power of the charging piles; Obtaining a final conversion efficiency based on the power supply and the charging power; Obtaining conversion loss power of the charging pile based on the final conversion efficiency and the total power supply; Collecting the AC side power supply of the charging pile in the standby state for multiple metering cycles on the previous day; Obtaining the standby loss of the charging pile based on the AC side power supply; Based on the total power supply, the charging amount, the conversion loss amount and the standby loss and according to the dynamic energy conservation of the charging pile, a final measurement error is obtained.

2. A DC charging pile measurement error detection method according to claim 1, characterized in that: The final conversion efficiency is obtained by: Obtaining a plurality of conversion efficiencies based on all of the supply power and the charging power; A scatter plot is obtained based on all the conversion efficiencies and the rated powers of the charging piles; After eliminating abnormal data based on the scatter plot, a conversion efficiency curve is obtained; Obtaining an inflection point based on the conversion efficiency curve; Arbitrarily select a target charging power and a corresponding target power supply power that are greater than the inflection point; The final conversion efficiency is obtained based on a ratio of the target charging power to the target supply power.

3. A DC charging pile measurement error detection method according to claim 2, characterized in that: The conversion efficiency calculation method is: Among them, η d represents the conversion efficiency, P c Indicates charging power, P g Indicates the power supply.

4. A DC charging pile measurement error detection method according to claim 1, characterized in that: The conversion loss power calculation method is: in, Indicates the conversion loss, η z represents the final conversion efficiency, Indicates the total power supply.

5. A DC charging pile measurement error detection method according to claim 4, characterized in that: The standby loss is obtained by: Collecting the AC side power supply of the charging pile in a standby state for multiple metering cycles on the previous day to obtain multiple AC side power supplies; An average value based on the multiple AC side power supplies is used as the standby loss.

6. A DC charging pile measurement error detection method according to claim 5, characterized in that: The standby loss calculation method is: in, represents standby loss, n represents the number of metering cycles, Indicates the power supply on the AC side.

7. A DC charging pile measurement error detection method according to claim 6, characterized in that: The final measurement error is obtained, including: Constructing a charging pile dynamic energy conservation equation based on all of the total power supply, the charging amount, the conversion loss amount and the standby loss to obtain a plurality of charging pile dynamic energy conservation equations; A plurality of measurement errors are obtained based on solving the dynamic energy conservation equations of all the charging piles; The final measurement error is obtained by taking an average value based on all the measurement errors after removing abnormal values.

8. A DC charging pile measurement error detection method according to claim 7, characterized in that: The dynamic energy conservation equation of the charging pile is specifically: Where k represents the number of charging guns in the charging state. represents the charge capacity, and ε represents the measurement error.

9. A DC charging pile measurement error detection method according to claim 1, characterized in that: Also includes: Based on the comparison between the final measurement error and the set accuracy level table, the accuracy level of the internal meter of the charging pile is determined.

10. A DC charging pile measurement error detection system, applied to a DC charging pile measurement error detection method as claimed in any one of claims 1 to 9, characterized in that: include: Data acquisition module, conversion loss acquisition module, standby loss acquisition module and test result output module; The data acquisition module is used to collect the total power supply of the AC side of multiple charging piles and the charging amount of the corresponding charging piles; collect the power supply power of the AC side of multiple charging piles and the charging power of the charging piles; The conversion loss acquisition module is used to obtain the final conversion efficiency based on the power supply power and the charging power; and obtain the conversion loss power of the charging pile based on the final conversion efficiency and the total power supply; The standby loss acquisition module is used to collect the AC side power supply of the charging pile in the standby state of multiple metering cycles on the previous day; and obtain the standby loss of the charging pile based on the AC side power supply; The detection result output module is used to obtain a final measurement error based on the total power supply, the charging amount, the conversion loss and the standby loss and according to the dynamic energy conservation of the charging pile.

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