CN112346001A - Electric energy compensation algorithm and system of adapter for calibration of field tester - Google Patents
Electric energy compensation algorithm and system of adapter for calibration of field tester Download PDFInfo
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- CN112346001A CN112346001A CN202011273613.4A CN202011273613A CN112346001A CN 112346001 A CN112346001 A CN 112346001A CN 202011273613 A CN202011273613 A CN 202011273613A CN 112346001 A CN112346001 A CN 112346001A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
An electric energy compensation algorithm and a system of an adapter for calibrating a direct current charger field tester are disclosed, wherein the method comprises the following steps: step 1, calibrating a voltage U and a current I of a field tester of a direct current charger by using a direct current electric energy standard device; step 2, inputting large current to a direct current charger field tester by using the direct current electric energy standard device for n times, wherein n is a positive integer, and when the input large current is Ii1Then, the voltage U is measured on the DC electric energy standard devicei1The voltage U can be measured on the field tester of the direct current chargeri2(ii) a Step 3, using the measured data in the step 2 to calculate the line resistance on the loop
Step 4, the wire resistance obtained by the calculation in the step 3 is used
The generated voltage drop interference is brought into the power calculation to compensate the power error. Compared with the prior art, the invention feeds back and measures the high-voltage input of the tester in real time; meanwhile, the impedance of a voltage input end is increased, the line voltage drop caused by voltage and current synthesis is reduced, and finally the system error is reduced.
Description
Technical Field
The invention belongs to the technical field of metering and verification of instruments and meters, and particularly relates to an electric energy compensation algorithm and system of an adapter for calibrating a field tester of a direct-current charger.
Background
With the strong support of the state on the new energy industry, the electric automobile industry is rising, and huge business opportunities and wide markets are brought to the electric automobile charging station industry. As shown in fig. 1, in the prior art, a dc charger is a device for charging a new energy vehicle, and is an important metering device related to trade settlement for metering and settling a charged amount. The field tester for the direct current charger is equipment for calibrating the direct current charger on site. In order to ensure the metering reliability of the direct current charger field tester, a direct current electric energy meter standard device is used for calibration. The traceability of the charging pile verification device is particularly important.
The standard device of the direct current electric energy meter is usually a virtual power source, voltage and current are output through electrical isolation, the standard device cannot be directly connected with a special standard direct current charging interface of a field tester, the standard device can only be connected through separated voltage and current wiring, the field condition cannot be truly simulated, and errors in actual use can be reflected.
The existing technical scheme is to manufacture an adapter, a pair of standard direct current charging interfaces and a set of electric wiring terminals with conventional voltage and current isolation are installed on the adapter, the adapter is connected with a calibrating device through the conventional electric wiring terminals, and the adapter is connected with the standard direct current charging interfaces on a field tester through a direct current charging connector conforming to GB/T20234.3-2015 regulations. The problem of the unmatched conventional electric terminal of the voltage galvanic isolation output of standard device and the standard direct current interface that charges of on-the-spot tester is solved.
In the prior art, although an adapter for switching a direct current charger field tester to a direct current electric energy standard device is used for tracing the voltage and the current of the direct current charger field tester, due to the line resistance of a direct current charging connector, when electric energy is calibrated, a certain error is caused by the voltage drop Δ V generated by a large current through a charging connecting line.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an electric energy compensation algorithm of an adapter for calibrating a field tester of a direct current charger.
The invention adopts the following technical scheme. An electric energy compensation algorithm of an adapter for calibrating a direct current charger field tester comprises the following steps:
step 1, calibrating a voltage U and a current I of a field tester of a direct current charger by using a direct current electric energy standard device;
step 2, inputting large current to the direct current charger field tester by using the direct current electric energy standard device for n times, wherein n is a positive integer, and the large current input to the direct current charger field tester by using the direct current electric energy standard device for the ith time is Ii1I ═ 1,2, …, n; when in useThe input large current is Ii1Then, the voltage U is measured on the DC electric energy standard devicei1The voltage U can be measured on the field tester of the direct current chargeri2；
Step 3, using the measured data in step 2, calculating the line resistance on the loop according to the following formula
In the formula:
n represents the times of measuring the line resistance on the loop, namely the times of inputting large current to the field tester of the direct current charger by using a direct current electric energy standard device,
Ui1indicating that the ith direct current electric energy standard device is used for inputting large current I to the direct current charger field testeri1When the voltage is measured on the direct current electric energy standard device,
Ui2indicating that the ith direct current electric energy standard device is used for inputting large current I to the direct current charger field testeri1The voltage measured by a direct current charger field tester is measured;
step 4, the wire resistance obtained by the calculation in the step 3 is used
The generated voltage drop interference is brought into the power calculation to compensate the power error.
Preferably, step 1 further comprises: the adapter is connected to the voltage measuring terminal of the field tester, and the IN + of the adapter is common to the IN + of the field tester.
Preferably, step 1, the voltage U and the current I of the field tester of the direct current charger are respectively calibrated by using a direct current electric energy standard device, and the calibration voltage and the current of the field tester are separated.
Preferably, in step 2, the large currents input to the field tester of the dc charger by using the dc power standard device n times may be the same or different.
Preferably, in step 2, the large current input to the field tester of the dc charger by using the dc power standard device n times is 100A.
The invention also provides an electric energy compensation system of the adapter for calibrating the direct current charger field tester by using the electric energy compensation algorithm, which comprises the following steps: the direct current charger on-site testing device comprises a direct current charger on-site testing instrument, a double-gun-head cable, an adapter and a direct current electric energy standard device, wherein the direct current charger on-site testing instrument is connected with the adapter through the double-gun-head cable, and the direct current electric energy standard device is connected with the adapter.
Preferably, the direct current charger field test appearance includes: and the current measuring module is used for calibrating the current I of the direct current charger field tester.
Preferably, the direct current charger field test appearance includes: and the voltage measuring module is used for calibrating the voltage U of the direct current charger field tester.
Preferably, the voltage at the common high end point of the charging input interface of the direct current charger field tester is fed back to the voltage measuring end of the direct current electric energy standard device, that is, the lead from the IN + of the adapter to the IN + of the direct current charger field tester is common, so that the high voltage input of the direct current charger field tester is fed back and measured IN real time.
Preferably, the device further comprises a data processing module for calculating the obtained line resistance
The generated voltage drop interference is brought into the power calculation to compensate the power error.
Compared with the prior art, the invention has the advantages that the invention directly feeds back the voltage at the common high end point of the charging input interface of the tested tester to the voltage measuring end of the standard device by adopting the line voltage drop elimination technology and utilizing the special charging connector, and feeds back the high voltage input of the tester to the voltage measuring end of the standard device in real time; meanwhile, the impedance of a voltage input end is increased, the line voltage drop caused by voltage and current synthesis is reduced, and finally the system error is reduced.
Drawings
FIG. 1 is a schematic view of a charging pile field tester system;
fig. 2 is a schematic diagram of a calibration system of a field tester of the direct current charger.
In the figure:
10-a direct current charger field tester;
11-a current measuring module;
12-a voltage measurement module;
20-double gun head cable;
30-charging pile;
40-an electric vehicle;
50-an adapter;
60-direct current electric energy standard device.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Example 1: electric energy compensation algorithm of adapter for calibrating direct current charger field tester
As shown in fig. 2, the invention provides an electric energy compensation algorithm of an adapter for calibrating a field tester of a direct current charger, which comprises the following steps:
step 1, respectively calibrating the voltage U and the current I of a field tester of the direct current charger by using a direct current electric energy standard device, wherein the voltage and the current are calibrated separately, so that the voltage and the current of the field tester can be accurately calibrated. More specifically, the present invention is to provide a novel,
during the measurement IN step 1, the connection relation is that all the connection is good before the calibration, and the adapter is connected to the voltage measuring end of the field tester, namely the connection line of the IN-end, to perform impedance matching, so that the impedance of the voltage input end is increased, the input current is prevented from being shunted by the voltage loop, and the system error caused by shunting is reduced.
Step 2, inputting large current to the direct current charger field tester by using the direct current electric energy standard device for n times, wherein n is a positive integer, and the large current input to the direct current charger field tester by using the direct current electric energy standard device for the ith time is Ii1I ═ 1,2, …, n; when the input large current is Ii1Then, the voltage U is measured on the DC electric energy standard devicei1The voltage U can be measured on the field tester of the direct current chargeri2。
It can be understood that the large current I input by the field tester of the DC charger is provided by using a DC electric energy standard devicei1In time, the voltage drop is generated just because of the line resistance on the loop, and the voltage U is measured on a direct current electric energy standard devicei1The voltage U greater than that measured on a field tester of the direct current chargeri2。
It is understood that a person skilled in the art can arbitrarily set the dc power standard device according to actual field to input large current to the dc charger field tester, and a preferred but non-limiting embodiment is to input a current of about 100A; similarly, the large currents input multiple times may be the same or partially the same, or the currents input at each time may be different.
It will also be appreciated that the field tester calibrated in step 1 can only obtain the accurate U in step 2i2The value is obtained.
Step 3, using the measured data in the step 2, namely using a direct current electric energy standard device to input a large current I to the direct current charger on-site testeri1Voltage U measured at DC power standard devicei1And the voltage U measured by the DC charger on-site testeri2The line resistance on the loop is calculated by the following formula
In the formula:
n represents the times of measuring the line resistance on the loop, namely the times of inputting large current to the field tester of the direct current charger by using a direct current electric energy standard device,
Ui1indicating that the ith direct current electric energy standard device is used for inputting large current I to the direct current charger field testeri1When the voltage is measured on the direct current electric energy standard device,
Ui2indicating that the ith direct current electric energy standard device is used for inputting large current I to the direct current charger field testeri1And meanwhile, measuring the voltage by a field tester of the direct current charger.
Step 4, in the data processing module of the host, according to multiple accurate measurements, when the electric energy is calibrated, the line resistance obtained by calculating in the step 3
The generated voltage drop interference is brought into the power calculation to compensate the power error. The electronic load is an adapter, and the compensation is to bring the calculated line resistance into the actual power calculation to compensate and correct.
It is understood that one skilled in the art can arbitrarily select a suitable component as the data Processing module, including but not limited to a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processing chip), an ASIC (Application Specific Integrated Circuit), and so on.
Example 2: electric energy compensation system of adapter for calibrating direct current charger field tester
A power compensation system for an adapter for calibration of a dc charger field tester using the power compensation algorithm of embodiment 1, comprising: the direct current charger on-site testing device comprises a direct current charger on-site testing instrument 10, a double-gun-head cable 20, an adapter 50 and a direct current electric energy standard device 60, wherein the direct current charger on-site testing instrument 10 is connected with the adapter 50 through the double-gun-head cable 20, and the direct current electric energy standard device 60 is connected with the adapter 50.
The field tester 10 for the direct current charger includes: and the current measuring module 11 is used for calibrating the current I of the direct current charger field tester.
The field tester 10 for the direct current charger includes: and the voltage measuring module 12 is used for calibrating the voltage U of the field tester of the direct current charger.
The voltage at the common high end point of the charging input interface of the direct current charger field tester 10 is fed back to the voltage measuring end of the direct current electric energy standard device 60, namely the lead from the IN + of the adapter 50 to the IN + of the direct current charger field tester 10 is shared, and the high voltage input of the direct current charger field tester 10 is fed back and measured IN real time.
The system also comprises a data processing module which is used for bringing the voltage drop interference generated by the line resistance R < Lambda > obtained by calculation into the electric energy calculation to compensate the electric energy error.
Compared with the prior art, the invention has the advantages that the invention adopts the line voltage drop elimination technology, namely, the compensation calculation is carried out on the calculation loop resistance, and the specially-made charging connector, namely the adapter and the double-gun cable, is utilized to directly feed back the voltage at the common high end point of the charging input interface of the tested tester to the voltage measuring end of the standard device, namely the IN + of the adapter is common to the IN + of the field tester, so as to feed back and measure the high-voltage input of the tester IN real time; meanwhile, the impedance of a voltage input end is increased, the line voltage drop caused by voltage and current synthesis is reduced, and finally the system error is reduced.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. An electric energy compensation algorithm of an adapter for calibrating a field tester is characterized by comprising the following steps:
step 1, calibrating a voltage U and a current I of a field tester of a direct current charger by using a direct current electric energy standard device;
step 2, inputting large current to the direct current charger field tester by using the direct current electric energy standard device for n times, wherein n is a positive integer, and the large current input to the direct current charger field tester by using the direct current electric energy standard device for the ith time is Ii1I ═ 1,2, …, n; when the input large current is Ii1Then, the voltage U is measured on the DC electric energy standard devicei1The voltage U can be measured on the field tester of the direct current chargeri2；
Step 3, using the measured data in step 2, calculating the line resistance on the loop according to the following formula
In the formula:
n represents the times of measuring the line resistance on the loop, namely the times of inputting large current to the field tester of the direct current charger by using a direct current electric energy standard device,
Ui1indicating that the ith direct current electric energy standard device is used for inputting large current I to the direct current charger field testeri1When the voltage is measured on the direct current electric energy standard device,
Ui2indicating that the ith direct current electric energy standard device is used for inputting large current I to the direct current charger field testeri1The voltage measured by a direct current charger field tester is measured;
step 4, the wire resistance obtained by the calculation in the step 3 is used
The generated voltage drop interference is brought into the power calculation to compensate the power error.
2. The power compensation algorithm for an adapter for calibration of a field tester as defined in claim 1, wherein:
the step 1 further comprises: the adapter is connected to the voltage measuring terminal of the field tester, and the IN + of the adapter is common to the IN + of the field tester.
3. The power compensation algorithm for an adapter for calibration of a field tester according to claim 1 or 2, wherein:
step 1, respectively calibrating voltage U and current I of a field tester of the direct current charger by using a direct current electric energy standard device, and separating the calibration voltage and the calibration current of the field tester.
4. The power compensation algorithm of the adapter for calibration of a field tester according to any one of claims 1 to 3, wherein:
in the step 2, the large currents input to the field tester of the direct current charger by using the direct current electric energy standard device for n times can be the same or different.
5. The power compensation algorithm of the adapter for calibration of a field tester according to any one of claims 1 to 3, wherein:
in the step 2, the large current input to the direct current charger field tester by using the direct current electric energy standard device for n times is 100A.
6. A power compensation system for a field tester calibration adapter using the power compensation algorithm of any of claims 1 to 5, comprising: a DC charger field tester (10), a double-gun head cable (20), an adapter (50) and a DC electric energy standard device (60), which is characterized in that,
the direct current charger field tester (10) is connected with the adapter (50) through a double-gun-head cable (20), and the direct current electric energy standard device (60) is connected with the adapter (50).
7. The system of claim 6, wherein the adapter further comprises a power compensation circuit configured to compensate for power consumption of the field tester calibration adapter, the power compensation circuit comprising:
the direct current charger on-site tester (10) includes: and the current measuring module (11) is used for calibrating the current I of the direct current charger field tester.
8. The system of claim 6 or 7, wherein the adapter comprises:
the direct current charger on-site tester (10) includes: and the voltage measuring module (12) is used for calibrating the voltage U of the direct current charger field tester.
9. The power compensation system of the adapter for calibration of the field tester according to any one of claims 6 to 8, wherein:
the voltage at the common high end point of the charging input interface of the direct current charger field tester (10) is fed back to the voltage measuring end of the direct current electric energy standard device (60), namely the lead from IN + of the adapter (50) to IN + of the direct current charger field tester (10) is common, and the high voltage input of the direct current charger field tester (10) is fed back and measured IN real time.
10. The power compensation system of an adapter for calibration of a field tester as claimed in any one of claims 6 to 9, wherein:
the device also comprises a data processing module for calculating the obtained wire resistance
The generated voltage drop interference is brought into the electric energy calculation compensationAnd (5) compensating the electric energy error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011273613.4A CN112346001A (en) | 2020-11-14 | 2020-11-14 | Electric energy compensation algorithm and system of adapter for calibration of field tester |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011273613.4A CN112346001A (en) | 2020-11-14 | 2020-11-14 | Electric energy compensation algorithm and system of adapter for calibration of field tester |
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| CN112346001A true CN112346001A (en) | 2021-02-09 |
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