CN110780260A - System and method for checking electric energy error of direct current charger - Google Patents

Abstract

The invention discloses a system and method for calibrating the electric energy error of a DC charger, comprising: a calibrator, which is embedded in a charging gun and used for charging an electric load according to the obtained electric energy pulse signal. and the measured power pulse signal measured by the built-in power meter of the DC charger, calculate the power error of the DC charger, and when the current state of the wireless communication signal is stable, send the power error directly to the server; when When the state of the current wireless communication signal is unstable, the power error is sent to the mobile communication terminal; the mobile communication terminal is used for receiving the power error and sending it to the server. The invention overcomes the problem of inconvenient information transmission of the charger in harsh environments, provides more possibilities for different outdoor environments such as the installation site of the DC charger, and can better meet the needs of market development. It is easier to monitor remotely compared to the verification scheme.

Description

A system and method for verifying power error of a DC charger

technical field

The present invention relates to the technical field of on-site verification of DC chargers, and more particularly, to a system and method for verifying electric energy errors of DC chargers.

Background technique

With the development of the times, electric vehicles have been put into use more and more widely. Corresponding to the rapid construction of charging stations, the installation of charging machines is increasing. However, for the emerging product brought by the development of new energy such as the charger, the test of its on-site power, billing and function is not perfect.

The professional equipment for on-site testing of the charger is the charger field calibrator. Since the charger field calibrator needs to be matched with the charger and load box to be tested, the more common charger field calibrators on the market are all It is relatively bulky, and the structure is mostly a box, which is inconvenient to transport, and the usage rate is not high, and the on-site environment is complex and easy to damage, which is not conducive to the on-site inspection and maintenance of the charger.

SUMMARY OF THE INVENTION

The present invention provides a system and method for verifying the electric energy error of a DC charger, so as to solve the problem of how to verify the DC charger efficiently.

In order to solve the above problems, according to an aspect of the present invention, a system for verifying the power error of a DC charger is provided, the system comprising:

The calibrator, embedded in the charging gun, is used to calculate the electric energy error of the DC charger according to the obtained electric energy pulse signal for charging the electric load and the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger , and when the state of the current wireless communication signal is stable, the power error is directly sent to the server; when the state of the current wireless communication signal is unstable, the power error is sent to the mobile communication terminal;

A server for receiving the power error;

The mobile communication terminal is used for receiving the power error and sending it to the server.

Preferably, wherein the calibrator comprises:

The electric energy metering module, which is connected with the electric energy pulse comparison module, is used to obtain the standard electric energy pulse signal for charging the electric load;

The wireless pulse receiving module is connected with the power pulse comparison module, and is used to obtain the measured power pulse signal measured by the built-in power meter of the DC charger;

a power pulse comparison module, connected with the main control module, for calculating the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal;

The main control module is used to directly send the power error to the server through the wireless module when the state of the current wireless communication signal is stable; when the current state of the wireless communication signal is unstable, the Bluetooth module will The power error is sent to the mobile communication terminal.

Preferably, wherein the calibrator further comprises:

a power supply module, connected to the main control module, for providing power support to the main control module when the calibrator has no external power support, so that the main control module can send power errors to the main control module server.

Preferably, wherein the calibrator further comprises:

The CAN communication module is connected to the CAN communication bus in the charging line between the DC charger and the electrical load, and is connected to the main control module, and is used to count the monitored DC charger terminals used by the electrical load. The detected total electricity consumption and the detected total cost are sent to the main control module;

The main control module is used to compare the standard total electricity consumption sent by the power metering module with the detected total electricity consumption to obtain the error value of the total electricity consumption; and calculate the standard total electricity consumption according to the standard total electricity consumption. cost, and compare the detected total cost with the standard total cost to obtain the error value of the total cost.

Preferably, wherein the system further comprises:

The wireless pulse transmitting unit is used to obtain the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger, and send it to the calibrator.

According to another aspect of the present invention, there is provided a method for verifying the power error of a DC charger, the method comprising:

The calibrator calculates the electric energy error of the DC charger according to the obtained electric energy pulse signal for charging the electric load and the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger;

When the current state of the wireless communication signal is stable, the calibrator directly sends the power error to the server;

When the current state of the wireless communication signal is unstable, the calibrator sends the power error to the mobile communication terminal, and the mobile communication terminal sends the power error to the server.

Preferably, wherein the method comprises:

Use the electric energy metering module of the calibrator to obtain the standard electric energy pulse signal for charging the electric load;

Use the wireless pulse receiving module of the calibrator to obtain the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger;

Calculate the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal by using the power pulse comparison module of the calibrator;

When the current state of the wireless communication signal is stable, the main control module of the calibrator directly sends the power error to the server through the wireless module;

When the current state of the wireless communication signal is unstable, the main control module of the calibrator sends the power error to the mobile communication terminal through the Bluetooth module.

Preferably, wherein the method further comprises:

When the calibrator has no external power support, a power supply module is used to provide power support to the main control module, so that the main control module can send power errors to the server.

Preferably, wherein the method further comprises:

The CAN communication module sends the detected total electricity consumption and the detected total cost to the main control module according to the statistics of the DC charger terminal used by the monitored electricity load;

The main control module compares the standard total electricity consumption sent by the energy metering module with the detected total electricity consumption to obtain the error value of the total electricity consumption;

Calculate the standard total cost according to the standard total electricity consumption, and compare the detected total cost with the standard total cost to obtain the error value of the total cost.

Preferably, wherein the method further comprises:

The measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger is obtained by using the wireless pulse transmitting unit, and sent to the calibrator.

The invention provides a system and method for calibrating the electric energy error of a DC charger, comprising: a calibrator, which is embedded in a charging gun and used for charging an electric load according to the obtained electric energy pulse signal. and the measured power pulse signal measured by the built-in power meter of the DC charger, calculate the power error of the DC charger, and when the current state of the wireless communication signal is stable, send the power error directly to the server; when When the state of the current wireless communication signal is unstable, the power error is sent to the mobile communication terminal; the mobile communication terminal is used for receiving the power error and sending it to the server. The present invention designs two data transmission schemes according to the on-site environment, overcomes the problem of inconvenient information transmission of the charger in harsh environments, provides more possibilities for different outdoor environments such as the installation site of the DC charger, and is more adaptable to market development Compared with the traditional online verification scheme, the charging gun of the present invention has no special requirements compared with the general gun head of the traditional charging machine, and the difference is only that the calibrator is different, which makes the The mass production cost of the solution is lower; the present invention solves the problems that the structure of the field calibrator is mostly a box body, which is bulky, inconvenient to carry, low in usage rate and difficult to maintain.

Description of drawings

Exemplary embodiments of the present invention may be more fully understood by reference to the following drawings:

FIG. 1 is a schematic structural diagram of a system 100 for verifying the power error of a DC charger according to an embodiment of the present invention;

FIG. 2 is a system block diagram for verifying the power error of a DC charger according to an embodiment of the present invention;

3 is a schematic structural diagram of a calibrator according to an embodiment of the present invention; and

FIG. 4 is a flowchart of a method 400 for verifying the power error of a DC charger according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.

Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

FIG. 1 is a schematic structural diagram of a system 100 for verifying the power error of a DC charger according to an embodiment of the present invention. As shown in FIG. 1 , the system for verifying the power error of the DC charger provided by the embodiment of the present invention can design two data transmission schemes according to the on-site environment, which overcomes the problem of the information of the charger in the harsh environment. The problem of inconvenient transmission provides more possibilities for different outdoor environments such as the installation site of the DC charger, and can better meet the needs of market development. At the same time, the use of this technical solution is easier than the traditional online verification solution. Remote monitoring; The charging gun has no special requirements compared with the general gun head of the traditional charging machine, and the difference is only that the calibrator is different, which makes the mass manufacturing cost of the solution lower; the invention solves the problem that the structure of the field calibrator is mostly a box, and The problems of large size, inconvenient handling, low utilization rate and difficult maintenance. The system 100 for calibrating the power error of the DC charger provided by the embodiment of the present invention includes: a calibrator 101 , a mobile communication terminal 102 and a server 103 .

Preferably, the calibrator 101 is embedded in the charging gun, and is used to calculate the power pulse signal obtained by charging the electrical load and the measured power pulse signal measured by the built-in power meter of the DC charger. The power error of the DC charger, and when the current state of the wireless communication signal is stable, the power error is directly sent to the server; when the current state of the wireless communication signal is unstable, the power error is sent to mobile communication terminal.

Preferably, the server 103 is configured to receive the power error.

Preferably, the mobile communication terminal 102 is configured to receive the power error and send it to a server.

Preferably, the system further comprises: a wireless pulse transmitting unit, configured to acquire the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger, and send it to the calibrator.

FIG. 2 is a system block diagram for verifying the power error of a DC charger according to an embodiment of the present invention. As shown in FIG. 2 , in the embodiment of the present invention, the system for verifying the power error of the DC charger includes: a DC charger, a charging gun, a wireless pulse transmitting unit, a server and a mobile communication terminal.

Among them, the DC charger is connected to the electrical load through the charging gun, and the end of the charging gun connected to the DC charger and the end connected to the electrical load conform to the national standard "GB/T 20234.3-2015 Electric Vehicle Conductive Charging Connection Device No. 3 Part of the relevant provisions of the DC charging interface. The charging gun includes: the charging gun plug and the charging gun socket, the charging gun plug is connected to the DC charger, the charging gun socket is connected to the electrical load, and the calibrator is embedded in the charging gun socket, which has high utilization rate, small size and light weight. The traditional DC charging pile inspection device is bulky and independently designed, which greatly improves the portability and ease of use of the device.

The DC charger has a built-in DC energy meter, and the wireless pulse transmitting unit captures the measured energy pulse signal of the charger through photoelectric sampling or direct wiring, and the collected measured energy pulse signal is transmitted to the wireless pulse receiver of the calibrator through wireless communication. module.

In the embodiment of the present invention, the calibrator collects the standard electric energy pulse signal charged to the electric load, compares it with the measured electric energy pulse signal without reception, and calculates the electric energy error. The calculated electric energy error is based on the location where the charger is located. The transmission is carried out according to different environments. When the current state of the wireless communication signal of the calibrator is stable, the calculated power error is transmitted to the server through the wireless module, so as to complete the on-site calibration of the charger; When the state of the communication signal is unstable, the Bluetooth module is turned on, the calculated power error is transmitted to the mobile communication terminal through the Bluetooth module, and a stable signal is obtained by changing the location of the mobile communication terminal, so that the power error is transmitted to the server through the wireless module.

Preferably, the calibrator 101 includes: an electric energy metering module, a wireless pulse receiving module, an electric energy pulse comparing module and a main control module.

Preferably, the electric energy metering module is connected with the electric energy pulse comparison module, and is used for obtaining the standard electric energy pulse signal for charging the electric load.

Preferably, the wireless pulse receiving module is connected with the power pulse comparison module, and is used for acquiring the measured power pulse signal measured by the built-in power meter of the DC charger.

Preferably, the power pulse comparison module is connected to the main control module, and is configured to calculate the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal.

Preferably, the main control module is used for directly sending the power error to the server through the wireless module when the current state of the wireless communication signal is stable; when the current state of the wireless communication signal is unstable , and the power error is sent to the mobile communication terminal through the Bluetooth module.

Preferably, wherein the calibrator further comprises:

a power supply module, connected to the main control module, for providing power support to the main control module when the calibrator has no external power support, so that the main control module can send power errors to the main control module server.

Preferably, wherein the calibrator further comprises:

The CAN communication module is connected to the CAN communication bus in the charging line between the DC charger and the electrical load, and is connected to the main control module, and is used to count the monitored DC charger terminals used by the electrical load. The detected total electricity consumption and the detected total cost are sent to the main control module;

The main control module is used to compare the standard total electricity consumption sent by the power metering module with the detected total electricity consumption to obtain the error value of the total electricity consumption; and calculate the standard total electricity consumption according to the standard total electricity consumption. cost, and compare the detected total cost with the standard total cost to obtain the error value of the total cost.

FIG. 3 is a schematic structural diagram of a calibrator according to an embodiment of the present invention. As shown in FIG. 3, in the embodiment of the present invention, the calibrator includes: an electric energy measurement module, a wireless pulse receiving module, an electric energy pulse comparison module, an MCU main control module, a CAN communication module, a voltage sampling module, a current sampling module, Bluetooth module, wireless module and power supply module.

The energy metering module adopts ADE7753, and obtains the standard energy pulse signal according to the voltage sampling module and the current sampling module. The voltage sampling module selects a resistor divider network with a 0.02% accuracy 5ppm temperature coefficient for signal conditioning, the current sampling module adopts a zero-flux current sensor with broadband AC and DC current comparator technology, and the back end adopts a 0.02% accuracy 5ppm temperature coefficient resistor for sampling , convert the current signal into a voltage signal.

The wireless pulse receiving module is connected with the power pulse comparison module, and is used for acquiring the measured power pulse signal measured by the built-in power meter of the DC charger according to the wireless pulse sending unit.

The power pulse comparison module is connected with the main control module, and is used for calculating the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal.

The MCU main control module adopts ADSP-21483 chip. This module has powerful computing power and can ensure that the accuracy of real-time measured power parameters reaches 0.05, thus increasing the measurement accuracy of power error checking.

The CAN communication module, using TCAN334GDR, is connected to the CAN communication bus in the charging line between the charger and the power load. The CAN communication module can monitor the total power consumption and the total power consumption of the charger used by the monitored power load. The detected total cost is sent to the MCU main control module, and the MCU main control module compares the standard total electricity consumption sent by the energy metering module with the detected total electricity consumption to obtain an error value of the total electricity consumption, and the MCU The main control module calculates the standard total cost through the standard total electricity consumption, and the MCU main control module compares the detected total cost with the standard total cost to obtain an error value of the total cost.

The power supply module is used to provide power for the calibrator. When testing the charging device on site, it needs to take power from the detected charging device. When the charging device is powered off, the power supply module starts the built-in rechargeable battery, and sets a certain time interval to Wake up the detection signal of the MCU main control module, control the wireless module to connect to the server, and send out all the detection data.

The calibrator communicates with the server through the wireless module, and the communication content includes parameter setting and measurement data return. Before the calibrator measures the new charging pile, it receives the detection task of the server through the wireless module, including the name of the measurement point, the address of the measurement point, the asset number, the pulse constant of the electric energy meter of the tested charging pile, the number of turns, the real-time measurement data upload interval, Rate settings, time period settings, date and time to change settings. After the calibrator receives a new detection task, there is an electric vehicle to charge, and the detection task will be automatically executed. If the detection is not completed within the specified time, and the detection data is obviously abnormal (such as more out of tolerance), the abnormality will pass. The wireless module alerts the server. If no abnormal situation occurs, the information will be reported to the server in time at the beginning of the detection, during the detection process and after the detection is completed. The calibrator implements a single verification design, and after the inspection is completed, there is no more inspection if there is a car.

The wireless module in the present invention may be any one or several of a Bluetooth module, a WiFi module, a 4G module, and a 5G module.

In the present invention, the mobile communication terminal can be any one of a mobile phone, a notebook, a POS machine, a PAD, a vehicle-mounted computer and a Bluetooth gateway.

Specifically, the working principle is as follows: the DC current sampling module and the DC voltage sampling module in the calibrator respectively collect the instantaneous DC current signal and the instantaneous DC voltage signal on the charging line of the charger to the electric load and transmit them to the electric energy metering module. And the instantaneous DC current signal and instantaneous DC voltage signal at this time are both analog signals; the energy metering module processes the received instantaneous DC current signal and instantaneous DC voltage signal into the form of digital signals, and then performs operations to obtain the standard instantaneous DC energy The pulse signal is sent to the energy pulse comparison module, and the energy measurement module can calculate the standard instantaneous DC current value, the standard instantaneous DC voltage value and the instantaneous power value through the instantaneous DC current signal and the instantaneous DC voltage signal. The DC current value, the standard instantaneous DC voltage value and the accumulated standard total power consumption during the whole charging process are sent to the MCU main control module; the wireless pulse sending module is connected to the DC power meter of the DC charger, and the DC power meter of the charger The power pulse signal (digital signal) is transmitted to the wireless pulse receiving module through the wireless pulse sending module, and after filtering, shaping and electrical isolation processing, the wireless pulse receiving module will output the detected instantaneous DC power pulse signal (digital signal) transmission To the power pulse comparison module, the power pulse comparison module compares and calculates the standard instantaneous DC power pulse signal and the detected instantaneous DC power pulse signal of the DC power meter of the DC charger, and obtains an instantaneous power error in the form of a percentage The power pulse comparison module sends this error value to the MCU main control module; the CAN communication module is connected to the CAN communication bus in the charging line between the charger and the power load, and the CAN communication module can monitor the power consumption. The detected total electricity consumption and the detected total cost calculated by the charger used by the load are sent to the MCU main control module, and the MCU main control module sends the standard total electricity consumption and the detected total electricity consumption sent by the power metering module. The error value of the total power consumption is obtained by comparing the total power consumption, and the MCU main control module calculates the standard total cost through the standard total power consumption, and the MCU main control module compares the detected total cost with the standard total cost to obtain The error value of the total cost.

The embodiment of the present invention can accurately determine the electric energy error of the DC charger, and provides solutions for data transmission in two scenarios, overcomes the problem of inconvenient information transmission of the charger in harsh environments, and provides different outdoor conditions such as the installation site of the DC charging pile. The environment provides more possibilities and can better meet the needs of market development. At the same time, using this technical solution is easier to monitor remotely compared with the traditional online verification solution.

FIG. 4 is a flowchart of a method 400 for verifying the power error of a DC charger according to an embodiment of the present invention. As shown in FIG. 4 , the method 400 for calibrating the electric energy error of a DC charger provided by the embodiment of the present invention starts from step 401 , and in step 401 the calibrator charges the electric load according to the obtained electric energy. The pulse signal and the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger are used to calculate the electric energy error of the DC charger.

In step 402, when the current state of the wireless communication signal is stable, the calibrator directly sends the power error to the server.

In step 403, when the current state of the wireless communication signal is unstable, the calibrator sends the power error to the mobile communication terminal; the mobile communication terminal sends the power error to the server.

Preferably, wherein the method comprises:

Use the electric energy metering module of the calibrator to obtain the standard electric energy pulse signal for charging the electric load;

Use the wireless pulse receiving module of the calibrator to obtain the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger;

Calculate the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal by using the power pulse comparison module of the calibrator;

When the current state of the wireless communication signal is stable, the main control module of the calibrator directly sends the power error to the server through the wireless module;

When the current state of the wireless communication signal is unstable, the main control module of the calibrator sends the power error to the mobile communication terminal through the Bluetooth module.

Preferably, the method further comprises: when the calibrator is not supported by an external power supply, using a power supply module to provide power support to the main control module, so that the main control module can send the power error to the server .

Preferably, wherein the method further comprises:

The CAN communication module sends the detected total electricity consumption and the detected total cost to the main control module according to the statistics of the DC charger terminal used by the monitored electricity load;

The main control module compares the standard total electricity consumption sent by the energy metering module with the detected total electricity consumption to obtain the error value of the total electricity consumption;

Calculate the standard total cost according to the standard total electricity consumption, and compare the detected total cost with the standard total cost to obtain the error value of the total cost.

Preferably, wherein the method further comprises:

The measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger is obtained by using the wireless pulse transmitting unit, and sent to the calibrator.

The method 400 for verifying the power error of a DC charger according to the embodiment of the present invention corresponds to the system 100 for verifying the power error of a DC charger according to another embodiment of the present invention. No longer.

The present invention has been described with reference to a few embodiments. However, as is known to those skilled in the art, other embodiments than the above disclosed invention are equally within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/the/the [means, component, etc.]" are open to interpretation as at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications or equivalent replacements are made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A system for verifying the electrical energy error of a DC charger, wherein the system comprises: The calibrator, embedded in the charging gun, is used to calculate the electric energy error of the DC charger according to the obtained electric energy pulse signal for charging the electric load and the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger , and when the state of the current wireless communication signal is stable, the power error is directly sent to the server; when the state of the current wireless communication signal is unstable, the power error is sent to the mobile communication terminal; A server for receiving the power error; The mobile communication terminal is used for receiving the power error and sending it to the server. 2. The system of claim 1, wherein the calibrator comprises: The electric energy metering module, which is connected with the electric energy pulse comparison module, is used to obtain the standard electric energy pulse signal for charging the electric load; The wireless pulse receiving module is connected with the power pulse comparison module, and is used to obtain the measured power pulse signal measured by the built-in power meter of the DC charger; a power pulse comparison module, connected with the main control module, for calculating the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal; The main control module is used to directly send the power error to the server through the wireless module when the state of the current wireless communication signal is stable; when the current state of the wireless communication signal is unstable, the Bluetooth module will The power error is sent to the mobile communication terminal. 3. The system of claim 2, wherein the calibrator further comprises: a power supply module, connected to the main control module, for providing power support to the main control module when the calibrator has no external power support, so that the main control module can send power errors to the main control module server. 4. The system of claim 2, wherein the calibrator further comprises: The CAN communication module is connected to the CAN communication bus in the charging line between the DC charger and the electrical load, and is connected to the main control module, and is used to count the monitored DC charger terminals used by the electrical load. The detected total electricity consumption and the detected total cost are sent to the main control module; The main control module is used to compare the standard total electricity consumption sent by the power metering module with the detected total electricity consumption to obtain the error value of the total electricity consumption; and calculate the standard total electricity consumption according to the standard total electricity consumption. cost, and compare the detected total cost with the standard total cost to obtain the error value of the total cost. 5. The system of claim 1, wherein the system further comprises: The wireless pulse transmitting unit is used to obtain the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger, and send it to the calibrator. 6. A method for verifying the electrical energy error of a DC charger, wherein the method comprises: The calibrator calculates the electric energy error of the DC charger according to the obtained electric energy pulse signal for charging the electric load and the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger; When the current state of the wireless communication signal is stable, the calibrator directly sends the power error to the server; When the current state of the wireless communication signal is unstable, the calibrator sends the power error to the mobile communication terminal, and the mobile communication terminal sends the power error to the server. 7. The method of claim 6, wherein the method comprises: Use the electric energy metering module of the calibrator to obtain the standard electric energy pulse signal for charging the electric load; Use the wireless pulse receiving module of the calibrator to obtain the measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger; Using the power pulse comparison module of the calibrator to calculate the power error of the DC charger according to the standard power pulse signal and the measured power pulse signal; When the current state of the wireless communication signal is stable, the main control module of the calibrator directly sends the power error to the server through the wireless module; When the current state of the wireless communication signal is unstable, the main control module of the calibrator sends the power error to the mobile communication terminal through the Bluetooth module. 8. The method according to claim 7, wherein the method further comprises: When the calibrator has no external power support, a power supply module is used to provide power support to the main control module, so that the main control module can send power errors to the server. 9. The method according to claim 7, wherein the method further comprises: The CAN communication module sends the detected total electricity consumption and the detected total cost to the main control module according to the statistics of the DC charger terminal used by the monitored electricity load; The main control module compares the standard total electricity consumption sent by the energy metering module with the detected total electricity consumption to obtain the error value of the total electricity consumption; Calculate the standard total cost according to the standard total electricity consumption, and compare the detected total cost with the standard total cost to obtain the error value of the total cost. 10. The method of claim 6, wherein the method comprises: The measured electric energy pulse signal measured by the built-in electric energy meter of the DC charger is obtained by using the wireless pulse transmitting unit, and sent to the calibrator.

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