CN102385047A - Charging post direct-current electric energy meter calibrating device - Google Patents
Charging post direct-current electric energy meter calibrating device Download PDFInfo
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- CN102385047A CN102385047A CN2011102414652A CN201110241465A CN102385047A CN 102385047 A CN102385047 A CN 102385047A CN 2011102414652 A CN2011102414652 A CN 2011102414652A CN 201110241465 A CN201110241465 A CN 201110241465A CN 102385047 A CN102385047 A CN 102385047A
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Abstract
The invention discloses a charging post direct-current electric energy meter calibrating device, which comprises a calibrating power supply, a data acquisition unit, a data processing unit and a human-computer interaction unit. The charging post direct-current electric energy meter calibrating device is a device which is characterized in that the calibrated direct-current electric energy meter is calibrated and corrected in a virtual power output method by the calibrating device on the basis of a real-time pulse comparison method. Two independent power supplies serve as a calibrating power supply. By aiming at the situations of higher rated current and high rated voltage of the calibrated direct-current electric energy meter, large dynamic range, high requirement on frequency response performance and the like, the metering performance of the calibrated direct-current electric energy meter can be comprehensively and accurately evaluated, and the charging post direct-current electric energy meter calibrating device is convenient for the electric energy metering characteristics to be traced to the superior national standard.
Description
Technical field
The present invention relates to a kind of charging pile direct current energy meter calibrating installation, be specially the electric energy meter calibrating apparatus of the Vehicular accumulator cell charging of using to big-and-middle-sized electric automobile, belong to calibration, calibrating and the detection technique field of direct current energy metering outfit.
Background technology
The Vehicular accumulator cell general using DC charging that big-and-middle-sized electric automobile uses, the electric current and voltage of charging pile when charging is: (400 ~ 800) V/ (0 ~ 500) A, when this charging pile charges to Vehicular accumulator cell; Electric energy for charge volume calculates, and is special-purpose direct current energy meter, because such electric energy meter rated current and load voltage value are higher; The change in current scope is big; Existing metering and calibrating device can't effectively be assessed the performance of such electric energy meter, and the variation range of electric current, voltage is very wide during charging pile charging work, and has ripple and impact spike; Higher to performance requirements such as the dynamic range of electric energy meter and frequency responses; Accordingly, to the calibrating installation of charging pile direct current energy meter, need higher accuracy index; Be beneficial to assess all-sidedly and accurately the metering performance of direct current energy meter, be convenient to the electric energy metrical characteristic and be traceable to higher level's national standard.
Known calibrating installation to the electric automobile charging pile direct current energy meter; Be to adopt equivalent conversion mode to calibrate; Be characterized in: utilize equivalent voltage to replace the sampled voltage of electrical energy meter electricity flow port shunt, the real work electric current of simulation electric energy meter is examined and determine the electric energy metrical function of electric energy meter; This method weak point is: substitute the shunt sampled voltage through equivalent voltage; Shunt is separated with electric energy meter, ignored the error that causes in the shunt measuring process, make the calibration data of electric energy meter can't truly reflect the actual working characteristics of electric energy meter; And test data needs manual record, and carries out lot of data aftertreatment work, be unfavorable for experimentation accurately with efficient, be unfavorable for detecting in time providing of data.The real-time pulse of employing relative method calibrating metering device is also arranged; Like Chinese invention patent " a kind of direct current energy meter calibrating installation and method " (application number: 201010565330.7 applyings date: 2010-11-25) disclosed; Comprise human-computer interaction interface, main control module, electric current and voltage power amplifier module and measurement module, electric energy computing module, full sized pules output interface and seized pulse input interface; The electric energy computing module is according to voltage, current measurement module measurement result; Calculating also is converted to full sized pules, exports to seized electric energy meter, and the electric energy computing module is converted the electric energy input of seized ammeter according to the pulse input of seized electric energy meter; And compare with the electric energy of calibrating installation; Calculate out the electric energy error of seized ammeter, its weak point is: this device and method is to the calibrating bad adaptability of charging pile gauging table, and the calibrating of performances such as the dynamic range of electric energy meter and frequency response is not reached requirement.
On the other hand; In the existing known technology; For the charging pile electric energy meter calibration, be to adopt a bigger direct supply of power to give seized ammeter input calibrating required voltage, current value, the standard termination of seized ammeter output termination; Adopt equivalence conversion or real-time pulse relative method to examine and determine then, so this method consumed power when calibrating is bigger.
A kind of based on the real-time pulse relative method, calibrating installation realizes the device of the assay calibration of electric energy meter with the virtual power way of output, be not shown in existing patent or the relevant technical literature report.
Summary of the invention
The objective of the invention is problem to the background technology proposition; A kind of charging pile direct current energy meter calibrating installation is provided; Be based on the real-time pulse relative method, calibrating installation realizes the calibrating apparatus of seized direct current energy meter with the virtual power way of output; To seized direct current energy meter rated current with situation such as load voltage value is higher, dynamic range is big and frequency response performance is had relatively high expectations; Can assess the metering performance of seized direct current energy meter all-sidedly and accurately, be convenient to the electric energy metrical characteristic and be traceable to higher level's national standard.
Technical scheme of the present invention is: a kind of charging pile direct current energy meter calibrating installation; Comprise calibrating power supply, data acquisition unit, data processing unit and man-machine interaction unit; It is characterized in that: described calibrating power supply is two independent current sources; One of them is the DC current source that is connected with seized direct current energy meter current terminal, and another is the direct voltage source that is connected with seized direct current energy meter voltage terminal; Described data acquisition unit comprises voltage acquisition module, current acquisition module, seized direct current energy meter pulse output acquisition module; Described voltage acquisition module is parallelly connected with seized direct current energy meter voltage terminal; The current acquisition module is connected with seized direct current energy meter current terminal; Said data processing unit is connected with data acquisition unit, and man-machine interaction unit is connected with data processing unit.
The principle of work of charging pile direct current energy meter calibrating installation of the present invention is: independently direct voltage source and DC current source are respectively seized direct current energy meter voltage terminal, current terminal provides the voltage and current set-point; The voltage of data acquisition unit, current acquisition module are gathered voltage, the current signal in the calibrating loop respectively, and wherein voltage acquisition module obtains sampled signal through the direct current standard voltage divider; The current acquisition module obtains sampled signal through DC current ratio standard and sampling resistor; Voltage, the current signal in the output pulse of the seized direct current energy meter of data processing unit control data collecting unit synchronous acquisition and calibrating loop are realized the calibrating to electric energy meter through standard of comparison recurrence interval and seized direct current energy meter recurrence interval.Man-machine interaction unit utilization operation display platform; Can Real Time Observation examine and determine situation during calibrating; Regulate the current/voltage value, data measured and error analysis can save as files such as Excel as required, need not when calibrating, to carry out data recording and late time data processing.
The invention has the beneficial effects as follows: independent voltage source provides voltage output; Because of the little consumed power of loop current lower; The load of independent current mainly is DC current ratio standard and sampling resistor; The electric energy that consumes is also very low, and independently voltage, current source constitute virtual power, have realized the calibrating of seized direct current energy meter.Seized direct current energy meter output terminal need not to insert in addition standard termination, the power consumption when having significantly reduced calibrating.
Description of drawings
Accompanying drawing 1 is to be the theory diagram of the embodiment of the invention;
Accompanying drawing 2 is embodiment of the invention data processing unit electric energy metrical algorithm logic figure;
Accompanying drawing 3 is for being data processing unit multichannel synchronousing collection sequential chart;
Accompanying drawing 4 is man-machine interaction unit operation interface and data presentation figure.
Embodiment
Mark in the accompanying drawing: 1-direct voltage source, 2-DC current source, 3-direct current standard voltage divider, 4-DC current ratio standard; 5-sampling resistor, 6-seized direct current energy meter, 7-data processing equipment; 8-data acquisition unit, 9-data processing unit, 10-man-machine interaction unit.
Below in conjunction with accompanying drawing inventive embodiments is described further:
With reference to accompanying drawing 1, a kind of charging pile direct current energy meter calibrating installation comprises calibrating power supply, data acquisition unit, data processing unit and man-machine interaction unit, and data processing unit comprises that the electric energy metrical algorithm is realized, multichannel synchronousing collection.The calibrating power supply is two independent current sources; One of them is a DC current source 2, and another is a direct voltage source 1, and DC current source 2 is connected with seized direct current energy meter 6 current terminals; Direct voltage source 1 is connected with seized direct current energy meter 6 voltage terminals; Data acquisition unit 8 comprises voltage acquisition module, current acquisition module, seized direct current energy meter 6 pulses output acquisition module, and voltage acquisition module is parallelly connected with seized direct current energy meter 6 voltage terminals, and the current acquisition module is connected with seized electric energy meter 6 current terminals; Data processing unit 9 is connected with data acquisition unit 8, and man-machine interaction unit 10 is connected with data processing unit 9.
The two-way analog channel of data acquisition unit is gathered calibrating current in loop and voltage signal respectively, and wherein voltage acquisition passage and seized direct current energy meter voltage terminal are parallel to and measure the loop, obtain sampled signal through direct current standard voltage divider 3; Current acquisition passage and seized direct current energy meter current terminal are series at measures the loop, obtains sampled signal through DC current ratio standard 4 and sampling resistor 5; The digital channel of data acquisition unit 8 is gathered the output pulse of seized direct current energy meter 6, and calibrating installation is realized the calibrating to seized direct current energy meter through standard of comparison recurrence interval and seized direct current energy meter recurrence interval.
The power supply of calibrating installation of the present invention is made up of DC current source 2 and direct voltage source 1, and wherein Spellmansl10N150 is adopted in DC voltage 1 source, and maximum output voltage is 10kV, and DC current source 2 adopts SWL-500A/8V, and maximum output current is 500A.The current/voltage ratio standard comprises direct current standard voltage divider 3, current ratio standard 4 and sampling resistor 5.Wherein direct current standard voltage divider 3 adopts GF-10kV DC voltage ratio standard, and this voltage divider can be selected by 10000:10,10000:1, three kinds of no-load voltage ratios of 10000:0.1.Current ratio standard 4 adopts 2LB-1A type DC current ratio standard, and this standard no-load voltage ratio is 10000A/5A, and sampling resistor 5 is 10 Ω/1W.Data acquisition unit 8 comprises shielding terminal box, shielded cable and capture card and industrial computer, and capture card uses 18 high-precision multi-path capture card PCI-6281 of NI company, has 16 tunnel analog input ports and 24 digital I/O.Electric current, voltage signal analog channel sampling rate can reach 500kS/s, input range can be as required from ± 0.1V to ± 10V.During selection ± 10V range, every channel sample limits of error ± (0.0072% reading+0.0031% range+21 μ V); The temporal resolution 50ns of capture card digital channel, accuracy is 0.005%.
Because 1 of independent direct current voltage source provides voltage output; Because of the little consumed power of loop current lower; The load of independent direct current current source 2 mainly is DC current ratio standard 4 and sampling resistor 5; The electric energy that consumes is also very low, and independently voltage, current source constitute virtual power, have realized the calibrating of seized direct current energy meter 6.Seized direct current energy ammeter 6 output terminals need not to insert in addition standard termination, the power consumption when having significantly reduced calibrating.
Referring to shown in Figure 2, be the data processing unit electric energy metrical algorithm logic figure of technical scheme design of the present invention.This algorithm is according to 14.2.1 regulation among the JJG842-1993 " direct current energy meter vertification regulation ", and standard electric energy meter satisfies relational expression with the electric energy error of seized direct current energy meter in the identical time
:
δ=[(
E x-
E)?/E]×100% (1)
Wherein
E XBe seized direct current energy meter energy value,
EBe standard electric energy meter energy value, the kWh of unit;
Relational expression is satisfied in seized direct current energy meter energy value:
E x=
t/(
t 1 a H) (2)
Wherein:
a HBe electric energy meter pulse constant, the imp/kWh of unit;
t 1Be the seized direct current energy meter recurrence interval, the s of unit;
tBe Measuring Time, the s of unit;
Relational expression is satisfied in standard electric energy meter energy value:
E x=
UIt/(3600×1000) (3)
Wherein
UBe loop voltage, the V of unit;
IBe loop current, the A of unit;
tBe Measuring Time, the s of unit; (2), (3) formula substitution (1) formula can be got electric energy error and satisfy relational expression:
(4)
Full sized pules cycle when standard electric energy meter is worked with the pulse constant of seized direct current energy meter is satisfied relational expression:
t 0=3600×1000/(
UIa H) (5)
Substitution (4) but the formula abbreviation obtains the computing formula of real-time pulse cycle relative method electric energy error:
δ=(
t 0-
t 1)/
t 1 (6)
Wherein
UBe loop voltage, the V of unit;
IBe loop current, the A of unit;
a HBe the pulse constant, the imp/kWh of unit; Calibrating procedure reads the sampled signal of capture card analog channel 1 and analog channel 2,
U=10000
U 1/ 10, wherein
U 1Be analog channel 1 voltage,
UBe the voltage source output voltage;
I=10000
U 2/ 5
R, wherein
U 2Be analog channel 2 voltages,
R Be passage 2 sampling resistors,
IBe the current source output current; During real work, voltage, electric current have certain fluctuation, loop voltage in the loop owing to measure
U, electric current
IAverage voltage in the available stipulated time
, current average
Replace; The seized direct current energy meter recurrence interval
t 1Replace the average period with some pulses, satisfies relational expression respectively:
t 1=
T/(
n-1)；
Calculate seized direct current energy Watch Error through formula (2), (3); For the harmonic wave situation in better observation and the analysis to measure loop, calibrating procedure is also to loop voltage
U,Electric current
ICarry out fft analysis, obtain DC content, first-harmonic content and each harmonic content in the loop.
Referring to shown in Figure 3, be the data processing unit multichannel synchronousing collection sequential chart that technical scheme design of the present invention realizes.For the accurate and effective of verification result, analog channel in the verification process and digital channel must realize synchronous acquisition.The cycle of the digital channel sampled signal of electric energy meter is greater than 80ms, and the sampling period of analog channel is less than 1ms, so synchro control adopts digital channel control analog channel.When the capture card digital channel receives first pulse signal rising edge of seized electric energy meter, trigger analog channel and begin sampling, receive last pulse signal after, the control analog channel finishes sampling.
Referring to shown in Figure 4, be calibrating installation man-machine interaction unit operation interface and the data presentation figure that technical scheme design of the present invention realizes.Because the parameter that calibrating installation need be provided with and show is more, easy to use for operating personnel, during design interface, to measure parameter and place according to categories subarea, the sampled signal district shows the input waveform of acquisition system in real time.The input setting area can be provided with sampling rate, parameters such as Measuring Time according to actual needs; The calibrating viewing area shows measures real time data, is convenient to operating personnel and understands the calibrating situation in real time; Data recorded area has been preserved the data in the whole measuring process, and measurement can save as the Excel file after finishing, and handled easily personnel data processing has been saved mistake and a large amount of work that record data bring; Voltage circuit harmonic wave viewing area and current return viewing area have shown the harmonic wave situation in the loop of measuring in real time, show the content of direct current, first-harmonic and each harmonic.
The digital collection card that the present invention passes through utilizes LabVIEW software to carry out the editor of realization, calibration data processing and the man machine operation interface of calibration algorithm as data acquisition equipment.The calibrating installation output voltage: 0 ~ 10kV is adjustable; Output current: 0 ~ 500A is adjustable; The limits of error ± (0.05% reading+0.05% range); Can satisfy the calibrating and measuring work of 0.5 grade, 1.0 grades, 2.0 grades and above direct current energy meter, can promote the high power DC electric energy meter calibration and be operated in domestic carrying out.Use this calibrating installation effectively to calibrate, to examine and determine, foundation is provided the type selecting of electric energy meter to the metering performance of direct current energy meter; Can also in manufacture process, debug as electric energy meter manufacturer, the testing tool of factory inspection.This calibrating installation adopts modular design, and each assembly is separate, and is for convenience detach, can be applied to on-site proving or laboratory verification according to different needs.
Claims (1)
1. charging pile direct current energy meter calibrating installation; Comprise calibrating power supply, data acquisition unit, data processing unit and man-machine interaction unit; It is characterized in that: described calibrating power supply is two independent current sources; One of them is the DC current source that is connected with seized direct current energy meter current terminal, and another is the direct voltage source that is connected with seized direct current energy meter voltage terminal; Described data acquisition unit comprises voltage acquisition module, current acquisition module, seized direct current energy meter pulse output acquisition module; Described voltage acquisition module is parallelly connected with seized direct current energy meter voltage terminal; The current acquisition module is connected with seized direct current energy meter current terminal; Said data processing unit is connected with data acquisition unit, and man-machine interaction unit is connected with data processing unit.
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| CN102914760A (en) * | 2012-09-27 | 2013-02-06 | 中国电力科学研究院 | Direct-current power meter calibrating device |
| CN103424732A (en) * | 2013-08-05 | 2013-12-04 | 广西电网公司电力科学研究院 | Detection device and detection method for direct current electric energy meter |
| CN103439684A (en) * | 2013-08-05 | 2013-12-11 | 广西电网公司电力科学研究院 | System and method for detecting true shape electric energy metering errors of electric car battery charger/charging post |
| CN105044641A (en) * | 2015-06-30 | 2015-11-11 | 黑龙江省计量检定测试院 | Electric vehicle charging metering instrument field calibration device |
| CN105093011A (en) * | 2015-07-21 | 2015-11-25 | 国网浙江省电力公司绍兴供电公司 | Detecting and converting device for electric car AC-DC charging piles |
| CN105259532A (en) * | 2015-11-26 | 2016-01-20 | 云南电网有限责任公司电力科学研究院 | Electric vehicle charging pile DC electric energy meter calibration system |
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| CN102914760A (en) * | 2012-09-27 | 2013-02-06 | 中国电力科学研究院 | Direct-current power meter calibrating device |
| CN102914760B (en) * | 2012-09-27 | 2015-11-04 | 中国电力科学研究院 | A kind of direct current energy meter calibrating installation |
| CN103424732A (en) * | 2013-08-05 | 2013-12-04 | 广西电网公司电力科学研究院 | Detection device and detection method for direct current electric energy meter |
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| CN110471017A (en) * | 2019-09-17 | 2019-11-19 | 上海贝岭股份有限公司 | Power standard source, metering chip and metering device |
| CN110865218A (en) * | 2019-10-14 | 2020-03-06 | 中物合(杭州)检测科技有限公司 | Electric energy metering method |
| CN110687348B (en) * | 2019-10-29 | 2021-04-27 | 四川长虹电器股份有限公司 | Electric energy metering device and electric energy metering method |
| CN110687348A (en) * | 2019-10-29 | 2020-01-14 | 四川长虹电器股份有限公司 | Electric energy metering device and electric energy metering method |
| CN111474512A (en) * | 2020-04-24 | 2020-07-31 | 郑州万特电气股份有限公司 | Acceptance detection method and device for newly-installed metering equipment and readable storage medium |
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| CN113702896B (en) * | 2021-07-13 | 2024-04-19 | 中国电力科学研究院有限公司 | System and method for measuring direct-current electric energy standard meter error based on voltage reference |
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Application publication date: 20120321 |