阅读说明：本技术 多功能集成式直流电能检定装置 (Multifunctional integrated direct current electric energy calibrating device ) 是由 郭帅 宋玮琼 韩柳 吕凤鸣 羡慧竹 李季巍 周文斌 赵成 刘士峰 薛大龙 曹佳义 于 2020-11-30 设计创作，主要内容包括：本申请提供了一种多功能集成式直流电能检定装置,该检定装置用于直流电能检定,检定装置包括大屏幕操作台、主控单元、大电压源、大电流源、小信号电压源、程控辅助电源、直流电压电流表、时钟基准和待测电能接口,大屏幕操作台与主控单元通信,大电压源、大电流源、小信号电压源、程控辅助电源和电压电流表分别与主控单元通信,时钟基准接入主控单元。包括大屏幕操作台、主控单元、大电压源、大电流源、小信号电压源、程控辅助电源、直流电压电流表、时钟基准和待测电能接口的多功能集成式直流电能检定装置,可以实现对接入的直流电能实现检定。(The application provides a multi-functional integrated form direct current electric energy calibrating installation, this calibrating installation is used for the direct current electric energy examination, calibrating installation includes large screen operation panel, the main control unit, big voltage source, big current source, little signal voltage source, programme-controlled auxiliary power supply, direct current voltage ampere meter, clock benchmark and the electric energy interface that awaits measuring, large screen operation panel and main control unit communication, big voltage source, big current source, little signal voltage source, programme-controlled auxiliary power supply and voltage ampere meter communicate with the main control unit respectively, the clock benchmark inserts the main control unit. The multifunctional integrated direct-current electric energy calibrating device comprises a large-screen operating platform, a main control unit, a large voltage source, a large current source, a small signal voltage source, a program-controlled auxiliary power supply, a direct-current voltage ammeter, a clock reference and an electric energy interface to be tested, and can realize calibration of the accessed direct-current electric energy.)

1. The utility model provides a multi-functional integrated form direct current electric energy calibrating installation, its characterized in that, calibrating installation is used for direct current electric energy examination, calibrating installation includes large screen operation panel, main control unit, big voltage source, big current source, small-signal voltage source, programme-controlled auxiliary power source, direct current voltage ampere meter, clock benchmark and the electric energy interface that awaits measuring, the large screen operation panel with the main control unit communication, big voltage source the big current source the small-signal voltage source programme-controlled auxiliary power source with the voltage ampere meter respectively with the main control unit communication, the clock benchmark is inserted the main control unit.

2. The certification device according to claim 1, further comprising a computer certification system in communication with the master control unit.

3. The calibrating apparatus according to claim 1, wherein the calibrating apparatus comprises an operation table and a table front panel, the table front panel is located on the operation table, and the power interface to be tested is integrated on the table front panel.

4. The verification device as claimed in claim 1, wherein the verification device realizes verification of the charging pile by using a comparison method, and the comparison method is realized by:

measuring the real-time voltage, the real-time current and the charging time of the charging pile through the direct-current voltage ammeter;

determining the actual electric energy of the charging pile according to the real-time voltage, the real-time current and the charging time;

acquiring an electric energy value displayed by the charging pile;

and comparing the actual electric energy with the displayed electric energy value to determine the electric energy error of the charging pile.

5. The verification apparatus as claimed in claim 4, wherein determining the actual power of the charging pile according to the real-time voltage, the real-time current and the charging time comprises: determining the actual electric energy of the charging pile by adopting a first formula, wherein the first formula is as follows:

wherein W represents the actual electric energy of the charging pile, u (t) represents the real-time voltage, i (t) represents the real-time current, and t represents the charging time.

6. The assay device as claimed in claim 1, wherein the voltage of the large voltage source ranges from 10mV to 1150V.

7. The assay device as claimed in claim 1, wherein the current of the large current source ranges from 1mA to 600A.

Technical Field

The application relates to the field of direct current electric energy verification, in particular to a multifunctional integrated direct current electric energy verification device.

Background

At present, electric energy metering schemes of charging piles and non-vehicle-mounted chargers which are put into operation are rough and not standard enough, and the design can not meet the requirement of forced verification. In addition, the defects of high detection energy consumption, high equipment investment, low operation efficiency and the like exist in the verification process, and the difficulty of periodic verification operation is increased. Therefore, under the dual background of the forced verification requirements and the new capital construction policy of the charging pile and the non-vehicle-mounted charger, the electric energy metering scheme of the charging pile and the non-vehicle-mounted charger is reasonably standardized and optimized, and the metering verification scheme of the charging pile and the non-vehicle-mounted charger is designed to meet the requirement of accurate metering, reduce the power consumption, reduce the investment and improve the efficiency.

According to the physical characteristics of vehicle-mounted batteries widely used by electric vehicles on the market, large and medium-sized electric vehicles are generally charged in a direct current mode (a direct current charging pile or a vehicle-mounted charger). Because the direct current voltage during actual charging is 400 ~ 800V, and the electric current is 0 ~ 300A, the demand of direct current electric energy measurement on the electric pile can't be adapted to fast in the function to current electric energy meter now on the market, and the majority adopts and uses alternating current electric energy meter measurement electric energy on the alternating current side.

Alternating current charging piles and most direct current charging piles on the market mainly take an alternating current electric energy meter as an electric energy measuring instrument on an alternating current side, wherein the measuring and charging are based on the measuring data of the alternating current electric energy meter in the charging pile. As shown in figure 1, voltage sampling is arranged on two sides of a live wire and a zero line in a charging pile, and current sampling is arranged on the live wire side.

The alternating current side is adopted to measure the electric energy by using the alternating current electric energy meter, the larger electric energy loss is calculated at the user side when the alternating current is rectified into the direct current through the rectifier bridge (which is equal to the rectifier unit in the figure 1), the charging cost of the user can be increased to a certain extent, and the quick popularization of individual users of the electric automobile is not facilitated. Therefore, manufacturers of electric energy meters develop novel direct current electric energy meters for direct current charging pile electric energy metering according to the requirements of electric automobile development. However, because the rated voltage and the rated current of the electric energy meter are high, the conventional metering and calibrating device cannot effectively calibrate the special direct-current charging pile.

According to the scheme, the multifunctional integrated direct-current electric energy calibrating device is developed by fully researching and analyzing the related technology and principle of the direct-current charging pile of the electric automobile.

Disclosure of Invention

The application mainly aims to provide a multifunctional integrated direct current electric energy calibrating device to solve the problems that charging piles and electric energy metering schemes of non-vehicle chargers which are put into operation in the prior art are rough and not standard enough, and the design cannot meet the requirement of forced calibration.

In order to realize above-mentioned purpose, according to an aspect of this application, provide a multi-functional integrated form direct current electric energy calibrating installation, calibrating installation is used for direct current electric energy examination, calibrating installation includes large screen operation panel, main control unit, big voltage source, big current source, small signal voltage source, programme-controlled auxiliary power source, direct current voltage ampere meter, clock benchmark and the electric energy interface that awaits measuring, large screen operation panel with the main control unit communication, big voltage source the big current source small signal voltage source programme-controlled auxiliary power source with the voltage ampere meter respectively with the main control unit communication, the clock benchmark inserts the main control unit.

Further, the calibrating device also comprises a computer calibrating system, and the computer calibrating system is communicated with the main control unit.

Furthermore, the calibrating device comprises an operating platform and a platform front panel, the platform front panel is positioned on the operating platform, and the electric energy interface to be tested is integrated on the platform front panel.

Further, the calibrating installation adopts the comparative method to realize the examination to filling electric pile, the implementation mode of comparative method is: measuring the real-time voltage, the real-time current and the charging time of the charging pile through the direct-current voltage ammeter; determining the actual electric energy of the charging pile according to the real-time voltage, the real-time current and the charging time; acquiring an electric energy value displayed by the charging pile; and comparing the actual electric energy with the displayed electric energy value to determine the electric energy error of the charging pile.

Further, determining the actual electric energy of the charging pile according to the real-time voltage, the real-time current and the charging time includes: determining the actual electric energy of the charging pile by adopting a first formula, wherein the first formula is as follows:

wherein W represents the actual electric energy of the charging pile, u (t) represents the real-time voltage, i (t) represents the real-time current, and t represents the charging time.

Further, the voltage of the large voltage source ranges from 10mV to 1150V.

Further, the current of the large current source ranges from 1mA to 600A.

By applying the technical scheme, the multifunctional integrated direct-current electric energy calibrating device comprises a large-screen operating platform, a main control unit, a large voltage source, a large current source, a small-signal voltage source, a program-controlled auxiliary power supply, a direct-current voltage and current meter, a clock reference and an electric energy interface to be tested, and the calibration of the accessed direct-current electric energy can be realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

FIG. 1 shows a schematic diagram of a prior art AC side power metering scheme;

fig. 2 shows a schematic diagram of a multifunctional integrated dc power verification apparatus according to an embodiment of the present application.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

As introduced in the background art, in the prior art, electric energy metering schemes of charging piles and non-vehicle-mounted chargers which are put into operation are rough and not standard enough, and the design cannot meet the requirement of forced verification.

An embodiment of the present application provides a multifunctional integrated dc power calibration apparatus, as shown in fig. 2, where the calibration apparatus is used for dc power calibration, and the calibration apparatus includes a large screen console, a main control unit, a large voltage source, a large current source, a small signal voltage source, a program-controlled auxiliary power source, a dc voltage/current meter, a clock reference and a power interface to be tested, where the large screen console communicates with the main control unit, the large voltage source, the large current source, the small signal voltage source, the program-controlled auxiliary power source and the voltage/current meter communicate with the main control unit, and the clock reference is connected to the main control unit.

In the scheme, the multifunctional integrated direct-current electric energy calibrating device comprises a large-screen operating platform, a main control unit, a large voltage source, a large current source, a small-signal voltage source, a program-controlled auxiliary power supply, a direct-current voltage and current meter, a clock reference and an electric energy interface to be tested, and the calibration of the accessed direct-current electric energy can be realized.

The specific principle of the multifunctional integrated direct current electric energy calibrating device for calibrating the electric energy of the charging pile is as follows: this calibrating installation has integrateed large screen operation panel and advanced master control unit, synchronizing signal through high accuracy clock benchmark, the big voltage source of cooperative control, big current source, the small signal voltage source, programme-controlled auxiliary power supply, and high accuracy volt ammeter, can realize synchronous accurate output high accuracy big voltage and heavy current, realize filling the relevant examination of electric pile (filling the interior novel direct current electric energy meter of electric pile promptly) to the direct current, and can realize other access formula electric energy examination and standard electric energy examination simultaneously, and creatively can realize the comparison method examination to above electric energy through high accuracy volt ammeter.

The multifunctional integrated direct-current electric energy verification device is further used for access type electric energy verification, standard electric energy verification and comparison method electric energy verification, wherein the access type electric energy verification refers to verification of an externally attached and indirectly accessed direct-current electric energy meter of an accessed shunt, the standard electric energy verification refers to verification of direct-current electric energy by using the standard electric energy meter, the comparison method electric energy verification refers to verification of a charging pile by using a comparison method, and specifically, verification is achieved by comparing an actual electric energy value of the charging pile with a displayed electric energy value.

The invention integrates various verification methods and various verification functions, and can realize effective, reliable and convenient verification on the special direct current electric energy meter on the direct current charging pile, wherein the special direct current electric energy meter is a nonstandard direct current electric energy meter which is manufactured by various manufacturers on the market in order to adapt to different types of production requirements. Great improvement to corresponding examination efficiency who fills electric pile, also avoided simultaneously in the past to rely on the alternating current energy meter to carry out the loss responsibility division problem of electric energy trade to filling electric pile. The device can also simultaneously test other standard types or non-standard types of common direct current access type or indirect access type electric energy meters, and compared with the original single-type single-function classification testing method on the market, the device can improve the diversity and the effectiveness of the testing without additionally providing a standard source, and greatly simplifies the operation complexity of corresponding direct current electric energy testing. Specifically, the voltage of the large voltage source ranges from 10mV to 1150V.

Specifically, the current of the large current source ranges from 1mA to 600A.

Specifically, the voltage of the small-signal voltage source ranges from 100uV to 4.4V.

Specifically, the main function realized by the program-controlled auxiliary power supply is the power supply requirement for different types of direct current electric energy meters during detection.

Specifically, the large voltage source, the large current source, the small signal voltage source, the program-controlled auxiliary power source, and the voltage ammeter are respectively in communication with the main control unit, and may adopt a wireless communication or wired communication mode.

In an embodiment of the present application, as shown in fig. 2, the calibrating apparatus further includes a computer calibrating system, and the computer calibrating system is in communication with the main control unit. The computer verification system mainly realizes the functions of carrying out full-automatic programmed verification operation on the whole verification process and issuing corresponding verification results.

In an embodiment of the present application, the calibrating apparatus includes an operation table and a table front panel, the table front panel is located on the operation table, and the to-be-measured power interface is integrated on the table front panel. The large voltage standard source, the large current standard source, the small signal voltage source and the program-controlled auxiliary power source are located below the operating platform, an output port of the large voltage standard source, an output port of the large current standard source, an output port of the small signal voltage source and an output port of the program-controlled auxiliary power source are arranged on a front panel of the platform body, and an interface line special for the charging pile is arranged on the front panel in an integrated mode and used for portable wiring during charging pile verification. Meanwhile, the table board of the device is provided with a high-precision voltage ammeter, so that the comparison method can be conveniently and rapidly detected. Meanwhile, the computer verification system can conveniently and quickly carry out full-automatic verification.

In an embodiment of the present application, the implementation method of the apparatus in the electric energy error measurement technology principle is as follows:

(1) watt-second method electric energy error measuring principle

The basic error is calculated according to equation 1:

in equation 1: t-selected measurement time in units of s;

w is the accumulated electric energy of the detected equipment, and the unit is kWh;

p-set constant power value in W.

(2) Pulse method electric energy basic error measuring principle

The actually measured pulse number n of the meter to be detected is compared with the calculated pulse number n0 to obtain the relative error of the electric energy.

In equation 2: n is the number of actually measured pulses;

n₀-calculating the number of fixed pulses, the number of fixed pulses being calculated according to equation 3:

in equation 3: c₀-the pulse constant of the assay device in imp/kWh;

C_Lthe pulse constant of the device under test has the unit imp/kWh.

In the application of the electric energy error of charging pile, because the electric energy meter of the to-be-detected charging pile is built in the device, the charging pile shell is required to be opened by collecting electric energy pulse, the operation is not convenient, so that the watt-second method is basically adopted during actual detection. The watt-second method can be adopted in the device, so that the measured electric energy is closer to the real output electric energy of the detected charging pile, and the measurement accuracy is improved. The pulse measurement can also be realized to the electric pile that fills who has set up pulse output interface to electric energy basic error who fills electric pile is examined and determine with the pulse method. In addition, in the charging process, the power of the charging pile is not completely constant, but fluctuates with time, so that the real-time voltage, the real-time current and the charging time of the charging pile can be measured through a high-precision direct-current voltage ammeter, the product of the voltage and the current is the power, the integral of the power in the charging time is the actual electric energy, and the actual electric energy is compared with the electric energy value displayed by the charging pile to determine the electric energy error of the charging pile. The actual measurement electric energy of charging pile can be calculated according to the following formula:

wherein W represents the actual electric energy of the charging pile, u (t) represents the real-time voltage, i (t) represents the real-time current, and t represents the charging time.

Therefore, comparative method electric energy verification of the charging pile is achieved. The comparison method has the advantages of the former two methods, namely measurement in any time period can be carried out, and meanwhile, the shell of the charging pile does not need to be directly opened to read photoelectric pulse signals. In addition, the application of the comparison method has higher requirements on a high-precision voltage and current meter, and can reduce the precision requirements on a voltage and current source of the verification equipment.

Meanwhile, the analysis of the above principle shows that the comparison method can be used for measuring simultaneously with any one of the watt-second method and the pulse method, so that the truth and the effectiveness of the measured data can be ensured, the effect of ensuring the measurement result is achieved, and the integrated application of various functions and measurement modes on the same calibrating device is creatively realized.

Therefore, the device can realize the measurement of the electric energy errors of watt-second method, pulse method, comparison method and the like and the measurement of various integrated modes of detection to any detected equipment (electric energy equipment such as direct current charging piles, access type electric energy meters and the like), has multiple functional types and very high integration level, and can realize the wide application in laboratories or project sites.

In an embodiment of the present application, the electric energy verification by the comparison method is implemented by: measuring the real-time voltage, the real-time current and the charging time of the charging pile through the direct-current voltage ammeter; determining the actual electric energy of the charging pile according to the real-time voltage, the real-time current and the charging time; acquiring the electric energy value displayed by the charging pile; and comparing the actual electric energy with the displayed electric energy value to determine the electric energy error of the charging pile. The electric energy error of the charging pile is determined through a comparison method.

The multifunctional integrated direct-current electric energy calibrating device meets the requirements of JJG 842-charge 1993 direct-current electric energy meter calibrating regulations and Q/GDW 1826-charge 2013 direct-current electric energy meter calibrating device technical specifications, can effectively meet the measuring range of special direct-current electric energy meters, is complete in function and stable in performance, and can completely meet the calibrating requirements of the novel direct-current electric energy meters of the charging piles.

From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

the utility model provides a multi-functional integrated form direct current electric energy calibrating installation, including large screen operation panel, main control unit, big voltage source, big current source, small signal voltage source, programme-controlled auxiliary power source, direct current voltage ampere meter, clock benchmark and the multi-functional integrated form direct current electric energy calibrating installation of the electric energy interface that awaits measuring, can realize the direct current electric energy of access and realize examining and determine.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.