CN110780139A - Method for measuring working error of electric vehicle charger - Google Patents
Method for measuring working error of electric vehicle charger Download PDFInfo
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- CN110780139A CN110780139A CN201911106093.5A CN201911106093A CN110780139A CN 110780139 A CN110780139 A CN 110780139A CN 201911106093 A CN201911106093 A CN 201911106093A CN 110780139 A CN110780139 A CN 110780139A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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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Abstract
The invention discloses a method for measuring a working error of a charger of an electric vehicle, which comprises the following steps: s1, selecting a load point according to the charging mode; s2, measuring the number m of actually measured pulses; s3, determining constant power P by using a standard power meter or a standard power source, and determining measurement time T by using a standard time meter
n(ii) a S4, calculating the preset pulse number m
0(ii) a S5, calculating a relative error; s6, obtaining a working error by an averaging method; the accuracy of the measurement of the working error is improved.
Description
Technical Field
The invention relates to the technical field of chargers, in particular to a method for measuring a working error of an electric vehicle charger.
Background
The electric vehicle charger comprises a rectification chopping control unit, an acquisition interaction terminal, a metering module, a conduction charging connecting device and the like, wherein after alternating current is converted into direct current through the rectification control unit, the electric vehicle is charged through the conduction charging connecting device, direct current electric energy metering is realized through the metering module, and signal control and data exchange are realized through the acquisition interaction module. The method for measuring the working error reflecting the working condition of the charger generally adopts a method of comparing a standard meter with the electric energy value measured by the charger to be detected at the same time, but the standard meter has an error, the charger to be detected has loss, the actual electric energy generated by the charger to be detected does not accord with the electric energy measured by the standard meter, and the working error measured by the standard meter method is not accurate enough.
Disclosure of Invention
Technical problem to be solved
Based on the problems, the invention provides a method for measuring the working error of the electric vehicle charger, which improves the measurement accuracy of the working error.
(II) technical scheme
Based on the technical problem, the invention provides a method for measuring the working error of a charger of an electric vehicle, which comprises the following steps:
s1, selecting at least three load points according to the charging mode;
s2, measuring the output pulse of the detected charger to obtain the number m of the measured pulses;
s3, measuring the set constant power P by a standard power meter, or determining the power P by a standard power source, and measuring the measuring time T corresponding to the output pulse of the charger under the constant power by a standard time meter
n；
S4, calculating the preset pulse number m
0：
In the formula (I), the compound is shown in the specification,T
nfor the selected measuring time, the unit is s, P is the set constant power value, the unit is W, C is the instrument constant of the machine to be charged, the unit is imp/KW.h, K
I、K
URespectively is the transformation ratio of the current divider and the voltage divider externally connected with the standard meter, when the current divider and the voltage divider are not externally connected, K is
IAnd K
UAre all equal to 1;
s5, calculating a relative error:
and S6, recording error measurement data at least twice under each load power, and taking the average value as a working error which should meet the working error limit.
Further, the load points in step S1 are:
when the constant voltage charging mode is selected, the output voltage U of the selected load point
min≤U≤U
maxWith an output current of I
min、0.5I
maxOr I
max；
When the constant current charging is selected, the output current of the selected load point is I
min≤I≤I
maxWith an output voltage of U
min、(U
min+U
max) /2 or U
max；
Wherein, U
max、U
minMaximum voltage and minimum voltage I respectively output by the charger
max、I
minThe maximum current and the minimum current are respectively output by the charger.
Further, the time T is measured in step S3
nSatisfies the following conditions: if the standard time measuring device is controlled by an automatic method, the detected charger continuously operates, and the measuring time is not less than 10 s; if the standard time measuring device is controlled by a manual method, the detected machine rotates continuously, and the measuring time is not less than 50 s.
Further, the working error limit in step S6 is related to the accuracy grade of the charger:
if the environmental temperature is more than or equal to minus 10 ℃ and less than or equal to T and less than or equal to plus 40 DEG C
When U is turned
min≤U≤U
maxAnd 0.1I
max≤I≤I
maxWhen the temperature of the water is higher than the set temperature,
the working error limit is ± (accuracy grade 1)%;
when U is turned
min≤U≤U
maxAnd I
min≤I<0.1I
maxWhen the temperature of the water is higher than the set temperature,
the working error limit is ± (accuracy grade 1+ 0.5)%;
wherein, U
max、U
minMaximum voltage and minimum voltage I respectively output by the charger
max、I
minThe maximum current and the minimum current are respectively output by the charger.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
(1) the method is different from a standard meter method in that a standard electric energy meter is adopted to measure electric energy, the product of time and constant power is adopted to obtain actual electric energy, and the obtained relative error is more accurate;
(2) according to the invention, under each load power, error measurement data is recorded at least twice, the average value is taken as a working error, and the measured working error is more accurate by using an averaging method;
(3) the invention selects comprehensive and representative load points aiming at different charging modes, so that the relative error measured by the method is more representative and the working error is more accurate;
(4) the invention aims at different current intervals, the relation between the working error limit and the accuracy grade is different, the smaller the current is, the larger the absolute value of the working error limit is, and the actual situation of the working error is met.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 is a schematic flow chart of a method for measuring a working error of a charger of an electric vehicle according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention discloses a method for measuring the working error of a charger of an electric vehicle, which comprises the following steps of:
s1, selecting a detection load point: selecting load points according to any one of the following charging modes, wherein at least three load points allow error measurement points to be added according to needs:
when the constant voltage charging mode is selected, the output voltage U of the selected load point
min≤U≤U
maxWith an output current of I
min、0.5I
maxOr I
max(ii) a When the constant current charging is selected, the output current of the selected load point is I
min≤I≤I
maxWith an output voltage of U
min、(U
min+U
max) /2 or U
max(ii) a Wherein, U
max、U
minMaximum voltage and minimum voltage I respectively output by the charger
max、I
minThe maximum current and the minimum current are respectively output by the charger;
s2, measuring the output pulse of the detected charger to obtain the number m of the measured pulses;
s3, measuring the constant power P by standard power meter, or determining the power P by standard power source, and measuring the time T required by the charger to output several pulses under constant power by standard time meter
n(ii) a If the standard time measuring device is controlled by an automatic method, the detected charger continuously operates, the measuring time is not less than 10s, if the standard time measuring device is controlled by a manual method, the detected charger continuously rotates, the measuring time is not less than 50s, and if the power pulse sequence sent by a standard power meter or a standard power source is not uniform enough or the corresponding speed is slow, the measuring time needs to be increased properly;
s4, calculating the preset pulse number m
0：
In the formula, T
nFor the selected measuring time, the unit is s, P is the set constant power value, the unit is W, C is the instrument constant of the machine to be measured, the unit is imp/KW.h, 1/(3.6 multiplied by 10)
6) For the unity of the units, imp/KW.h is rewritten into imp/W.s, K
I、K
URespectively is the transformation ratio of the current divider and the voltage divider externally connected with the standard meter, when the current divider and the voltage divider are not externally connected, K is
IAnd K
UAre all equal to 1; this is due to the fact that the number of pulses is proportional to the power consumed, which is proportional to the selected measurement time T from a set constant power value P
nObtaining the product of;
s5, measuring the actual electric energy obtained by the product of the time and the constant power, comparing the actual electric energy with the electric energy measured by the charger to determine the relative error of the charger, wherein the pulse number is in direct proportion to the electric energy value, and calculating the relative error:
s6, recording error measurement data at least twice under each load power, taking the average value as a working error to meet the working error limit, and if the average value does not meet the working error limit, discarding the measured data and carrying out measurement twice again;
the working error limit in step S6 is related to the accuracy level of the charger, and is affected when the ambient temperature is too high or too low, and the method for determining the working error limit is as follows:
s6.1, respectively measuring the ambient temperature on 2 orthogonal sections of the measured charger, enabling a thermometer to be close to the non-air outlet position of the measured charger, and taking the average value of temperature measurement values of different positions of the measured charger as an ambient temperature value T; s6.2, calculating an ambient temperature deviation value delta T:
if the ambient temperature is more than or equal to minus 10 ℃ and less than or equal to plus 40 ℃, the delta T is 0;
if the ambient temperature is more than or equal to minus 20 ℃ and T is less than minus 10 ℃, the delta T is equal to minus 10-T;
if the ambient temperature is more than 40 ℃ and less than or equal to 50 ℃, the delta T is 50-T;
s6.3, a correction value e of the working error limited by the environmental temperature:
e＝C
0×|ΔT|，
in the formula, C
0The unit is the average temperature coefficient measured by the electric energy of a charger, and the average temperature coefficient is%/K;
s6.4, calculating to obtain a working error limit:
when U is turned
min≤U≤U
maxAnd 0.1I
max≤I≤I
maxWhen the temperature of the water is higher than the set temperature,
the working error limit is ± (accuracy grade 1+ e)%;
when U is turned
min≤U≤U
maxAnd I
min≤I<0.1I
maxWhen the temperature of the water is higher than the set temperature,
the working error limit is ± (accuracy grade 1+0.5+ e)%.
In summary, the method for measuring the working error of the electric vehicle charger has the following advantages:
(1) the method is different from a standard meter method in that a standard electric energy meter is adopted to measure electric energy, the product of time and constant power is adopted to obtain actual electric energy, and the obtained relative error is more accurate;
(2) according to the invention, under each load power, error measurement data is recorded at least twice, the average value is taken as a working error, and the measured working error is more accurate by using an averaging method;
(3) the invention selects comprehensive and representative load points aiming at different charging modes, so that the relative error measured by the method is more representative and the working error is more accurate;
(4) the invention aims at different current intervals, the relation between the working error limit and the accuracy grade is different, the smaller the current is, the larger the absolute value of the working error limit is, and the actual situation of the working error is met.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (4)
1. A method for measuring the working error of a charger of an electric vehicle is characterized by comprising the following steps:
s1, selecting at least three load points according to the charging mode;
s2, measuring the output pulse of the detected charger to obtain the number m of the measured pulses;
s3, measuring the set constant power P by a standard power meter, or determining the power P by a standard power source, and measuring the measuring time T corresponding to the output pulse of the charger under the constant power by a standard time meter
n；
S4, calculating the preset pulse number m
0：
In the formula, T
nFor the selected measuring time, the unit is s, P is the set constant power value, the unit is W, C is the instrument constant of the machine to be charged, the unit is imp/KW.h, K
I、K
URespectively is the transformation ratio of the current divider and the voltage divider externally connected with the standard meter, when the current divider and the voltage divider are not externally connected, K is
IAnd K
UAre all equal to 1;
s5, calculating a relative error:
and S6, recording error measurement data at least twice under each load power, and taking the average value as a working error which should meet the working error limit.
2. The method for determining the working error of the electric vehicle charger according to claim 1, wherein the load points in step S1 are as follows:
when the constant voltage charging mode is selected, the output voltage of the selected load pointU
min≤U≤U
maxWith an output current of I
min、0.5I
maxOr I
max；
When the constant current charging is selected, the output current of the selected load point is I
min≤I≤I
maxWith an output voltage of U
min、(U
min+U
max) /2 or U
max；
Wherein, U
max、U
minMaximum voltage and minimum voltage I respectively output by the charger
max、I
minThe maximum current and the minimum current are respectively output by the charger.
3. The method for determining the operating error of the charger of the electric vehicle according to claim 1, wherein the measuring time T in step S3
nSatisfies the following conditions: if the standard time measuring device is controlled by an automatic method, the detected charger continuously operates, and the measuring time is not less than 10 s; if the standard time measuring device is controlled by a manual method, the detected machine rotates continuously, and the measuring time is not less than 50 s.
4. The method for determining the working error of the charger of the electric vehicle according to claim 1, wherein the working error limit in the step S6 is related to the accuracy grade of the charger:
if the environmental temperature is more than or equal to minus 10 ℃ and less than or equal to plus 40 ℃,
when U is turned
min≤U≤U
maxAnd 0.1I
max≤I≤I
maxWhen the temperature of the water is higher than the set temperature,
the working error limit is ± (accuracy grade 1)%;
when U is turned
min≤U≤U
maxAnd I
min≤I<0.1I
maxWhen the temperature of the water is higher than the set temperature,
the working error limit is ± (accuracy grade 1+ 0.5)%;
wherein, U
max、U
minMaximum voltage and minimum voltage I respectively output by the charger
max、I
minThe maximum current and the minimum current are respectively output by the charger.
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| CN111896909A (en) * | 2020-07-16 | 2020-11-06 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
| CN113156329A (en) * | 2021-03-11 | 2021-07-23 | 深圳市计量质量检测研究院（国家高新技术计量站、国家数字电子产品质量监督检验中心） | Alternating current charging pile calibrating device |
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Application publication date: 20200211 |