CN117554690A - DC electric energy metering method, DC electric energy metering device and equipment - Google Patents
DC electric energy metering method, DC electric energy metering device and equipment Download PDFInfo
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- CN117554690A CN117554690A CN202410034551.3A CN202410034551A CN117554690A CN 117554690 A CN117554690 A CN 117554690A CN 202410034551 A CN202410034551 A CN 202410034551A CN 117554690 A CN117554690 A CN 117554690A
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- 238000005070 sampling Methods 0.000 claims description 21
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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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
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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 application discloses a direct current electric energy metering method, a direct current electric energy metering device and equipment, and belongs to the technical field of electronic circuits. The direct current electric energy metering method comprises the following steps: acquiring a calibration sequence of a current collector and a first voltage acquired by the current collector in real time, wherein the calibration sequence comprises a plurality of calibration voltages; determining a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on the magnitude of the first voltage; determining a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage; acquiring the obtained second voltage in real time by a voltage acquisition circuit; an electrical energy metering result is determined based on the first voltage, the calibration parameter, and the second voltage. According to the method, the calibration sequence which is detected when the current collector leaves the factory is only required to be acquired, the calibration can be completed after the data processing is carried out, the direct-current meter is not required to be replaced because of replacement of the current collector, and the operation and maintenance cost is reduced.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a direct-current electric energy metering method, a direct-current electric energy metering device and equipment.
Background
The current collector is equipment for collecting and converting direct current signals into voltage signals, and is affected by line temperature within a sampling interval range, and a sampling result is nonlinear. Therefore, when the current collector and the dc meter are used for electric energy metering, the current collector and the dc meter need to be calibrated.
In the existing direct current electric energy metering device, a direct current meter is provided with a plurality of metering loops, each metering loop is connected with a current collector and calibrated, when the current collectors need to be replaced, as the characteristics of signal acquisition curves of the replaced current collectors are different, the error of metering results which are not calibrated is larger, so that the direct current meter cannot be directly connected into the original metering loops of the direct current meter, and only the current collectors and the direct current meter can be integrally replaced, so that the operation and maintenance cost is higher.
Disclosure of Invention
The embodiment of the application aims to provide a direct current electric energy metering method, a direct current electric energy metering device and equipment, which can solve the problem that the operation and maintenance cost of the existing direct current electric energy metering device is high.
In a first aspect, an embodiment of the present application provides a method for measuring dc power, where the method includes:
acquiring a calibration sequence of a current collector and a first voltage acquired by the current collector in real time, wherein the calibration sequence comprises a plurality of calibration voltages;
determining a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on the magnitude of the first voltage;
determining a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage;
acquiring the obtained second voltage in real time by a voltage acquisition circuit;
an electrical energy metering result is determined based on the first voltage, the calibration parameter, and the second voltage.
Optionally, the determining, based on the magnitude of the first voltage, a first calibration voltage and a second calibration voltage from the plurality of calibration voltages includes:
determining a calibration voltage having a voltage value greater than the first voltage and having a voltage value closest to the first voltage among the plurality of calibration voltages as the first calibration voltage;
and determining a calibration voltage with a voltage value smaller than the first voltage and a voltage value closest to the first voltage as the second calibration voltage in a plurality of calibration voltages of the calibration sequence.
Optionally, the calibration sequence further includes a plurality of calibration currents, the plurality of calibration currents and the plurality of calibration voltages corresponding one-to-one;
the determining a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage includes:
acquiring a first calibration current corresponding to the first calibration voltage and acquiring a second calibration current corresponding to the second calibration voltage;
determining a target parameter of a linear relationship between the voltage and the current acquired by the current collector based on the first calibration current, the first calibration voltage, the second calibration current and the second calibration voltage, and determining the target parameter as the calibration parameter of the first voltage.
Optionally, the determining the electric energy metering result based on the first voltage, the calibration parameter and the second voltage includes:
determining a calibration current corresponding to the first voltage based on the first voltage and the calibration parameter;
the electrical energy metering result is determined based on the calibration current and the second voltage.
Optionally, before acquiring the calibration sequence of the current collector, the method further comprises:
acquiring a current sampling interval and a calibration coefficient of the current collector;
dividing the current sampling interval into a plurality of calibration intervals based on the calibration coefficients;
acquiring a calibration current corresponding to each calibration interval, wherein the calibration current comprises current values corresponding to two endpoints of the corresponding calibration interval;
after the current collector is electrified with a standard current corresponding to the calibration current, determining the calibration voltage corresponding to the calibration current, wherein the calibration sequence comprises the calibration voltage corresponding to the calibration current.
In a second aspect, embodiments of the present application provide a dc power metering device, the device including:
the first acquisition module is used for acquiring a calibration sequence of the current collector and a first voltage acquired by the current collector in real time, wherein the calibration sequence comprises a plurality of calibration voltages;
a first determining module configured to determine a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on a magnitude of the first voltage;
a second determination module configured to determine a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage;
the second acquisition module is used for acquiring the obtained second voltage in real time by the voltage acquisition circuit;
and a third determining module for determining an electric energy metering result based on the first voltage, the calibration parameter and the second voltage.
Optionally, the first determining module includes:
a first determining sub-module configured to determine, as the first calibration voltage, a calibration voltage having a voltage value greater than the first voltage and a voltage value closest to the first voltage, among the plurality of calibration voltages;
and the second determining submodule is used for determining a calibration voltage with a voltage value smaller than the first voltage and a voltage value closest to the first voltage as the second calibration voltage in the plurality of calibration voltages.
Optionally, the calibration sequence further includes a plurality of calibration currents, the plurality of calibration currents and the plurality of calibration voltages corresponding one-to-one;
the second determining module includes:
the first acquisition submodule is used for acquiring a first calibration current corresponding to the first calibration voltage and acquiring a second calibration current corresponding to the second calibration voltage;
and the third determining submodule is used for determining a target parameter of the linear relation between the voltage and the current acquired by the current collector based on the first calibration current, the first calibration voltage, the second calibration current and the second calibration voltage, and determining the target parameter as the calibration parameter of the first voltage.
Optionally, the third determining module includes:
a fourth determining submodule, configured to determine a calibration current corresponding to the first voltage based on the first voltage and the calibration parameter;
a fifth determination sub-module for determining the electrical energy metering result based on the calibration current and the second voltage.
In a third aspect, embodiments of the present application provide a dc power metering device for performing the dc power metering method according to the first aspect.
In this embodiment of the present application, an execution body of the method in this embodiment of the present application includes a current collector and a dc meter, where after a calibration sequence and a first voltage of the current collector are acquired by the dc meter, the first calibration voltage and the second calibration voltage may be determined from a plurality of calibration voltages of the calibration sequence according to a magnitude of the first voltage, then a calibration parameter for calibrating the first voltage is determined according to the first calibration voltage and the second calibration voltage, and then electric energy is determined according to the first voltage, the calibration parameter, and the second voltage acquired by the voltage acquisition circuit. Through the steps of the method, when the current collector is damaged and needs to be replaced, the calibration sequence which is detected when the current collector leaves the factory is only required to be acquired, the calibration can be completed after the data processing is carried out, the direct-current meter is not required to be replaced because of the replacement of the current collector, and the operation and maintenance cost is reduced.
Drawings
Fig. 1 is a schematic flow chart of a direct current electric energy metering method according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a sampling circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a dc power metering device according to an embodiment of the present application.
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The method for measuring the direct current electric energy provided by the embodiment of the application is described in detail below by means of specific embodiments and application scenes thereof with reference to the accompanying drawings.
The execution body of the direct current electric energy metering method of the embodiment may be a direct current electric energy metering device, where the direct current electric energy metering device includes a current collector and a direct current meter, and the direct current meter includes a voltage sampling circuit and a metering module. In this embodiment, the direct current electric energy metering device is a separate device, and the current collector is used to be installed on the cable, so as to collect the current data of the cable; the direct current meter is provided with a connecting port for connecting a current collector, the current collector sends collected current data to the metering module through the connecting port, and the metering module receives voltage data collected by the voltage sampling circuit and calculates to obtain a metering result of electric energy. Specifically, fig. 1 is a schematic flow chart of a direct current electric energy metering method, as shown in fig. 1, the direct current electric energy metering method in the embodiment of the application includes the following steps:
step 101, a calibration sequence of a current collector and a first voltage obtained by the current collector in real time are obtained, the calibration sequence comprises a plurality of calibration voltages,
the calibration sequence of the current collector is detected when the current collector leaves the factory and stored in the current collector, and when the current collector is connected with the direct current meter through the connecting port, the calibration sequence and the first voltage acquired in real time are sent to the direct current meter. It should be noted that, the current collector collects current related data, but the current related data is represented in the form of a voltage signal. The current collector may be a hall sensor, a magneto-resistive effect sensor, a giant magneto-resistive effect sensor, a fluxgate sensor, or the like.
In addition, the plurality of calibration voltages can be ordered according to the order of the voltage values from big to small or from small to big, and a calibration interval can be formed between two adjacent calibration voltages after the ordering. The calibration voltage is the voltage corresponding to the standard current when the current collector leaves the factory, basically has no error and can be ignored.
A step 102 of determining a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on the magnitude of the first voltage,
in this step, after receiving the calibration sequence and the first voltage transmitted by the current collector, the dc meter determines a first calibration voltage and a second calibration voltage from a plurality of calibration voltages in the calibration sequence according to the first voltage. The manner of determining the first calibration voltage and the second calibration voltage may be: taking the two calibration voltages closest to the first voltage as the first and second calibration voltages, the exemplary calibration sequence includes (1V, 2V, 5V, 7V), the first voltage being 2.2V, then the first and second calibration voltages being 1V, 2V, respectively.
Step 103 of determining a calibration parameter of said first voltage based on said first calibration voltage and said second calibration voltage,
in an exemplary embodiment, in the interval of the first calibration voltage and the second calibration voltage, the historical data of the line temperature of the current sensor may be obtained, the influence value of the temperature on the collected voltage data is determined according to the historical data of the line temperature, the influence value is used as a calibration parameter, and the calibration parameter is added to or subtracted from the first voltage, so that an accurate first voltage may be obtained.
Step 104, acquiring the obtained second voltage in real time by the voltage acquisition circuit,
the voltage acquisition circuit acquires voltage data, divides the voltage through the sampling circuit to obtain second voltage, and sends the second voltage to the metering module. It should be noted that, because the voltage signal that the chip that the measurement module adopted can bear is less, no matter the voltage acquisition circuit sends the signal to the measurement module or the current collector sends the signal to the measurement module, all need carry out the bleeder just can realize through sampling circuit after dividing.
For example, taking a sampling circuit of a current collector as an example, the action of the sampling circuit is described, as shown in fig. 2, TMR V and TMR 0 on the right side of the sampling circuit are used for connecting the current collector, the current collector transmits voltage collecting signals, capacitors CB1, CB2, CB5 and the like are used for filtering, resistors RB6, RB1, RB4 and the like are used for dividing the voltage collecting signals, positive terminal voltage of TMR V is obtained after dividing, vref is a reference voltage, after dividing the reference voltage by resistors RB7, RB2, RB5 and the like, reference voltage of TMR 0 is obtained, and the current collector transmits a first voltage v=tmrv positive terminal voltage of the direct current meter to the reference voltage of TMR 0 through the sampling circuit.
Step 105, determining an electric energy metering result based on the first voltage, the calibration parameter and the second voltage.
And obtaining a calibrated first voltage through the first voltage and the calibration parameter, wherein the calibrated first voltage is used for representing current data of the cable collected by the current collector, and the second voltage is voltage data collected by the voltage collecting circuit, and the electric energy can be determined through the current data and the voltage data.
The execution main body of the method comprises a current collector and a direct current meter, after the direct current meter acquires a calibration sequence and a first voltage of the current collector, the first calibration voltage and a second calibration voltage can be determined from a plurality of calibration voltages of the calibration sequence according to the magnitude of the first voltage, then a calibration parameter for calibrating the first voltage is determined according to the first calibration voltage and the second calibration voltage, and then electric energy is determined according to the first voltage, the calibration parameter and the second voltage acquired by a voltage acquisition circuit. Through the steps of the method, when the current collector is damaged and needs to be replaced, the calibration sequence which is detected when the current collector leaves the factory is only required to be acquired, the calibration can be completed after the data processing is carried out, the direct-current meter is not required to be replaced because of the replacement of the current collector, and the operation and maintenance cost is reduced.
Optionally, step 102, determining, based on the magnitude of the first voltage, a first calibration voltage and a second calibration voltage from the plurality of calibration voltages, includes:
determining a calibration voltage having a voltage value greater than the first voltage and having a voltage value closest to the first voltage among the plurality of calibration voltages as the first calibration voltage;
and determining a calibration voltage with a voltage value smaller than the first voltage and a voltage value closest to the first voltage as the second calibration voltage in a plurality of calibration voltages of the calibration sequence.
Illustratively, the plurality of calibration voltages of the calibration sequence are arranged from large to small as: (），/>Is a positive integer, the first voltage is +.>The determination of a first calibration voltage and a second calibration voltage corresponding to a first voltage from a plurality of calibration voltages is also understood to mean that in (=>) Find +_ in the intervals formed by the adjacent two calibration voltages of (2)>The interval in which it is located. For example, a->The interval is (">) Then->The corresponding first and second calibration voltages are +.>、/>。
In this embodiment, based on the magnitude of the first voltage, a first calibration voltage and a second calibration voltage, the magnitude of which is closest to the first voltage, are determined, and the first calibration voltage is greater than the first voltage and the second calibration voltage is less than the first voltage. Since the first calibration voltage and the second calibration voltage are closest to the first voltage, the calibration parameters of the first voltage, which are subsequently determined from both, are also most accurate.
Optionally, the calibration sequence further includes a plurality of calibration currents, the plurality of calibration currents and the plurality of calibration voltages corresponding one-to-one;
step 103, determining a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage, including:
acquiring a first calibration current corresponding to the first calibration voltage and acquiring a second calibration current corresponding to the second calibration voltage;
determining a target parameter of a linear relationship between the voltage and the current acquired by the current collector based on the first calibration current, the first calibration voltage, the second calibration current and the second calibration voltage, and determining the target parameter as the calibration parameter of the first voltage.
In this embodiment, the calibration voltage is a voltage corresponding to the standard current when the current collector leaves the factory, so each calibration voltage corresponds to one calibration current, and the value of the calibration current is consistent with the value of the corresponding standard current.
Exemplary, the first calibration current obtained isThe first calibration voltage is +.>The first calibration current is +.>The second calibration voltage is +.>Obtaining two points related to the linear relation between the voltage and the current of the current collector），（/>），Further, two points are substituted +.>Solving the equation to obtain +.>The two target parameters are the calibration parameters of the first voltage.
In this embodiment, the linear relationship between the voltage and the current of the current collector in the interval of the first calibration voltage and the second calibration voltage, that is, the linear relationship between the first voltage and the corresponding current, is determined by finding the first calibration current and the second calibration current corresponding to the first calibration voltage and the second calibration voltage, and the current corresponding to the first voltage can be accurately determined according to the parameters corresponding to the linear relationship.
Optionally, step 105, determining an electric energy metering result based on the first voltage, the calibration parameter and the second voltage includes:
determining a calibration current corresponding to the first voltage based on the first voltage and the calibration parameter;
the electrical energy metering result is determined based on the calibration current and the second voltage.
In the present embodiment, referring to the above embodiments in combination, it is determined thatAfter the two calibration parameters, the first voltageCarry in->In (1) obtaining a calibration current +.>。
Calibrating currentAnd a second voltage->The product of the power values is the power value p at the current moment, the power value at each moment is continuously recorded, and the power values are integrated to obtain an electric energy metering result.
After the calibration parameters are determined, the calibrated current corresponding to the first voltage is determined through the calibration parameters, and the electric energy metering result is determined through the calibrated current corresponding to the first voltage and the second voltage, so that the accuracy of the electric energy metering result is ensured.
Optionally, before steps 101 to 105 of the embodiment shown in fig. 1, the method further includes:
acquiring a current sampling interval and a calibration coefficient of the current collector;
dividing the current sampling interval into a plurality of calibration intervals based on the calibration coefficients;
acquiring a calibration current corresponding to each calibration interval, wherein the calibration current comprises current values corresponding to two endpoints of the corresponding calibration interval;
after the current collector is electrified with a standard current corresponding to the calibration current, determining the calibration voltage corresponding to the calibration current, wherein the calibration sequence comprises the calibration voltage corresponding to the calibration current.
In this embodiment, the current sampling interval of the current collector is determined by the physical structure and material of the current collector, and the calibration coefficientUniformly dividing the current sampling interval into +_ according to the calibration coefficient>Calibration interval and obtain->End points of the individual calibration intervals, e.g. (-)>）。
The end points of the calibration intervals are corresponding calibration currents, when the current collector leaves the factory, standard current with the same value as the calibration current is fed into the current collector through a standard current source, and the calibration voltage corresponding to each calibration current is tested). And storing a calibration sequence containing the calibration voltage corresponding to each calibration current in the current collector, and transmitting the calibration sequence to the direct current meter when the current collector is connected with the direct current meter.
In the present embodiment of the present invention, in the present embodiment,the larger the divided intervals are, the smaller the difference value between each calibration interval is, the smaller the difference value between the corresponding adjacent two calibration voltages is, the functional relation between the adjacent two calibration voltages and the calibration current is infinitely close to a straight line, and the more accurate the parameters of the linear relation determined by the first calibration voltage, the first calibration current, the second calibration voltage and the second calibration current are, so that the more accurate the electric energy metering result is.
As shown in fig. 3, the embodiment of the present application further provides a dc power metering device 300, where the dc power metering device 300 includes:
a first obtaining module 301, configured to obtain a calibration sequence of a current collector and a first voltage obtained by the current collector by real-time collection, where the calibration sequence includes a plurality of calibration voltages;
a first determining module 302, configured to determine a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on a magnitude of the first voltage;
a second determining module 303, configured to determine a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage;
a second acquiring module 304, configured to acquire the obtained second voltage in real time by the voltage acquisition circuit;
a third determination module 305 is configured to determine an electric energy metering result based on the first voltage, the calibration parameter, and the second voltage.
Optionally, the first determining module 302 includes:
a first determining sub-module configured to determine, as the first calibration voltage, a calibration voltage having a voltage value greater than the first voltage and a voltage value closest to the first voltage, among the plurality of calibration voltages;
and the second determining submodule is used for determining a calibration voltage with a voltage value smaller than the first voltage and a voltage value closest to the first voltage as the second calibration voltage in the plurality of calibration voltages.
Optionally, the calibration sequence further includes a plurality of calibration currents, the plurality of calibration currents and the plurality of calibration voltages corresponding one-to-one;
the second determining module 303 includes:
the first acquisition submodule is used for acquiring a first calibration current corresponding to the first calibration voltage and acquiring a second calibration current corresponding to the second calibration voltage;
and the third determining submodule is used for determining a target parameter of the linear relation between the voltage and the current acquired by the current collector based on the first calibration current, the first calibration voltage, the second calibration current and the second calibration voltage, and determining the target parameter as the calibration parameter of the first voltage.
Optionally, the third determining module 305 includes:
a fourth determining submodule, configured to determine a calibration current corresponding to the first voltage based on the first voltage and the calibration parameter;
a fifth determination sub-module for determining the electrical energy metering result based on the calibration current and the second voltage.
Optionally, the dc power metering device 300 further includes:
the third acquisition module is used for acquiring a current sampling interval and a calibration coefficient of the current collector;
the dividing module is used for dividing the current sampling interval into a plurality of calibration intervals based on the calibration coefficients;
a fourth obtaining module, configured to obtain a calibration current corresponding to each calibration interval, where the calibration current includes current values corresponding to two endpoints of the corresponding calibration interval;
and the fourth determining module is used for determining the calibration voltage corresponding to the calibration current after the standard current corresponding to the calibration current is introduced into the current collector.
It should be noted that, the direct current power metering device 300 provided in the embodiment of the present application can implement all technical processes of the direct current power metering method shown in the embodiment of fig. 1, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted herein.
The embodiment of the application also provides a direct current electric energy metering device, which is used for executing each process of the embodiment of the method and can achieve the same technical effect, and in order to avoid repetition, the description is omitted here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of dc power metering, the method comprising:
acquiring a calibration sequence of a current collector and a first voltage acquired by the current collector in real time, wherein the calibration sequence comprises a plurality of calibration voltages;
determining a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on the magnitude of the first voltage;
determining a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage;
acquiring the obtained second voltage in real time by a voltage acquisition circuit;
an electrical energy metering result is determined based on the first voltage, the calibration parameter, and the second voltage.
2. The method of claim 1, wherein the determining a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on the magnitude of the first voltage comprises:
determining a calibration voltage having a voltage value greater than the first voltage and having a voltage value closest to the first voltage among the plurality of calibration voltages as the first calibration voltage;
and determining a calibration voltage with a voltage value smaller than the first voltage and a voltage value closest to the first voltage as the second calibration voltage in a plurality of calibration voltages of the calibration sequence.
3. The method of claim 1, wherein the calibration sequence further comprises a plurality of calibration currents, the plurality of calibration currents and the plurality of calibration voltages corresponding one-to-one;
the determining a calibration parameter of the first voltage based on the first calibration voltage and the second calibration voltage includes:
acquiring a first calibration current corresponding to the first calibration voltage and acquiring a second calibration current corresponding to the second calibration voltage;
determining a target parameter of a linear relationship between the voltage and the current acquired by the current collector based on the first calibration current, the first calibration voltage, the second calibration current and the second calibration voltage, and determining the target parameter as the calibration parameter of the first voltage.
4. The method of claim 3, wherein the determining the power metering result based on the first voltage, the calibration parameter, and the second voltage comprises:
determining a calibration current corresponding to the first voltage based on the first voltage and the calibration parameter;
the electrical energy metering result is determined based on the calibration current and the second voltage.
5. The method of any of claims 1 to 4, wherein prior to acquiring the calibration sequence of the current collector, the method further comprises:
acquiring a current sampling interval and a calibration coefficient of the current collector;
dividing the current sampling interval into a plurality of calibration intervals based on the calibration coefficients;
acquiring a calibration current corresponding to each calibration interval, wherein the calibration current comprises current values corresponding to two endpoints of the corresponding calibration interval;
after the current collector is electrified with a standard current corresponding to the calibration current, determining the calibration voltage corresponding to the calibration current, wherein the calibration sequence comprises the calibration voltage corresponding to the calibration current.
6. A direct current power metering device, characterized in that the direct current power metering device comprises:
the first acquisition module is used for acquiring a calibration sequence of the current collector and a first voltage acquired by the current collector in real time, wherein the calibration sequence comprises a plurality of calibration voltages;
a first determining module configured to determine a first calibration voltage and a second calibration voltage from the plurality of calibration voltages based on a magnitude of the first voltage;
a second determination module for determining a calibration parameter of the first voltage based on the first and second calibration voltages
The second acquisition module is used for acquiring the obtained second voltage in real time by the voltage acquisition circuit;
and a third determining module for determining an electric energy metering result based on the first voltage, the calibration parameter and the second voltage.
7. The direct current electrical energy metering device of claim 6 wherein the first determining module comprises:
a first determining sub-module configured to determine, as the first calibration voltage, a calibration voltage having a voltage value greater than the first voltage and a voltage value closest to the first voltage, among the plurality of calibration voltages;
and the second determining submodule is used for determining a calibration voltage with a voltage value smaller than the first voltage and a voltage value closest to the first voltage as the second calibration voltage in the plurality of calibration voltages.
8. The direct current power metering device of claim 6, wherein the calibration sequence further comprises a plurality of calibration currents, the plurality of calibration currents and the plurality of calibration voltages being in one-to-one correspondence;
the second determining module includes:
the first acquisition submodule is used for acquiring a first calibration current corresponding to the first calibration voltage and acquiring a second calibration current corresponding to the second calibration voltage;
and the third determining submodule is used for determining a target parameter of the linear relation between the voltage and the current acquired by the current collector based on the first calibration current, the first calibration voltage, the second calibration current and the second calibration voltage, and determining the target parameter as the calibration parameter of the first voltage.
9. The direct current electrical energy metering device of claim 6 wherein the third determining module comprises:
a fourth determining submodule, configured to determine a calibration current corresponding to the first voltage based on the first voltage and the calibration parameter;
a fifth determination sub-module for determining the electrical energy metering result based on the calibration current and the second voltage.
10. A direct-current electric energy metering device, characterized in that the direct-current electric energy metering device is used for executing the direct-current electric energy metering method according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410034551.3A CN117554690A (en) | 2024-01-10 | 2024-01-10 | DC electric energy metering method, DC electric energy metering device and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410034551.3A CN117554690A (en) | 2024-01-10 | 2024-01-10 | DC electric energy metering method, DC electric energy metering device and equipment |
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