CN115902756A - Pulse calibration method, device and system for single-phase and three-phase electric energy standard meter - Google Patents
Pulse calibration method, device and system for single-phase and three-phase electric energy standard meter Download PDFInfo
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Abstract
The method comprises the steps of obtaining a total measuring pulse period of a detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter; obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse; and calibrating the electrical parameters of the detected standard electric energy meter according to the error coefficients, so as to realize the accurate calibration of the single-phase and three-phase standard electric energy meter. The electric parameter of the detected electric energy standard meter is calibrated by optimizing the error coefficient and processing the obtained error coefficient, the relation between a measured value and a standard value can be accurately reflected, the calibration error of the single-three-phase electric energy standard meter is reduced, and therefore the calibration precision of the single-three-phase electric energy standard meter is improved.
Description
Technical Field
The application relates to the technical field of electric energy meter calibration, in particular to a pulse calibration method, device and system of a single-phase and three-phase electric energy standard meter.
Background
With the continuous development of the construction of the smart power grid, the electric energy metering precision of the smart electric energy meter is required to be higher, and meanwhile, the calibration and inspection equipment is required to be higher; the standard electric energy meter is also called a portable precise electric energy meter and is mainly used for checking errors of other electric energy meters. The electric energy standard meter generally refers to an electric energy meter which is used as a metering standard in magnitude transmission. The electric energy standard meter is mainly used for checking the accuracy of the installed electric energy meter and the low-grade standard electric energy meter so as to ensure the measurement accuracy of the meters.
At present, in the existing calibration mode of the single-three phase electric energy standard meter, the obtaining process of the measured value and the standard value is asynchronous, the calculated calibration coefficient inevitably has synchronization error, and the relationship between the measured value and the standard value cannot be accurately reflected, so that the calibration error of the single-three phase electric energy standard meter is large.
Disclosure of Invention
Therefore, it is necessary to provide a pulse calibration method, device and system for a single-three phase electric energy standard meter, which can improve the calibration accuracy of the single-three phase electric energy standard meter, in order to solve the problem that the calculated calibration coefficient has a synchronization error and cannot accurately reflect the relationship between the measured value and the standard value, resulting in a large calibration error of the single-three phase electric energy standard meter in the conventional calibration method for the single-three phase electric energy standard meter.
In a first aspect, the present application provides a pulse calibration method for a single-three phase electric energy standard meter, including the following steps:
acquiring a total measuring pulse period of a detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter;
obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse;
and calibrating the electrical parameters of the standard meter of the detected electrical energy according to the error coefficient.
Optionally, the step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse includes:
performing difference processing on the total period of the standard pulse and the total period of the measurement pulse to obtain a first difference;
and taking the first difference value as a dividend, and carrying out division processing on the first difference value and the total period of the measuring pulse to obtain an error coefficient.
Optionally, the pulse conversion algorithm includes a first conversion formula and a second conversion formula;
the first conversion formula is:
wherein D is an electrical measurement value or an electrical standard value, C is a pulse constant, and Δ t is a measurement pulse period or a standard pulse period;
the second conversion formula is:
wherein n is the number of pulses, Δ t t For each measuring pulse period or each standard pulse period, T is the total measuring pulse period or the total standard pulse period.
Optionally, the electrical measurement is a voltage measurement; the electric standard value is a voltage standard value;
the step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises the following steps:
obtaining a voltage error coefficient according to the total pulse period of the voltage measurement and the total pulse period of the voltage standard; the total period of the voltage measurement pulse is obtained by processing a voltage measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the voltage standard pulse is obtained by processing a voltage standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
Optionally, the electrical measurement is a current measurement; the electric standard value is a current standard value;
the step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises the following steps:
obtaining a current error coefficient according to the total pulse period of the current measurement and the total pulse period of the current standard; the total current measurement pulse period is obtained by processing a current measurement value by the detected electric energy standard meter according to a pulse conversion algorithm; the total period of the current standard pulse is obtained by processing a current standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
Optionally, the electrical measurement is a power measurement; the electric standard value is a power standard value;
the step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises the following steps:
obtaining a power error coefficient according to the total period of the power measurement pulse and the total period of the power standard pulse; the total period of the power measurement pulse is obtained by processing the power measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the power standard pulse is obtained by processing a power standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
Optionally, the step of obtaining the power error coefficient according to the total period of the power measurement pulse and the total period of the power standard pulse includes:
processing the power error coefficient, the power measured value and the power standard value based on a power phase angle conversion algorithm to obtain a phase angle difference value;
according to the error coefficient, the step of calibrating the electrical parameters of the standard meter of the detected electrical energy comprises the following steps:
and calibrating the phase angle parameter of the standard meter of the detected electric energy according to the phase angle difference value.
Optionally, the power phase angle transformation algorithm is:
wherein, theta R And KP is the power error coefficient and delta theta is the phase angle difference value measured by referring to the electric energy standard meter.
In a second aspect, the present application provides a pulse calibration apparatus for a single-three phase electric energy standard meter, the pulse calibration apparatus for a single-three phase electric energy standard meter comprising;
the pulse period acquisition unit is used for acquiring the total measurement pulse period of the detected electric energy standard meter and the total standard pulse period of the reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter;
the error coefficient processing unit is used for obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse;
and the calibration unit is used for calibrating the electrical parameters of the detected electrical energy standard meter according to the error coefficient.
In a third aspect, the application provides a pulse calibration system for a single three-phase electric energy standard meter, which comprises a plurality of detected electric energy standard meters, an error verification module, a reference electric energy standard meter and a three-phase standard power source;
the three-phase standard power source is respectively connected with the reference electric energy standard meter and each detected electric energy standard meter; the error verification module is respectively connected with the reference electric energy standard meter and each detected electric energy standard meter;
the error verification module is used for executing the steps of the pulse calibration method of any one of the single-phase and three-phase electric energy standard meters.
One of the above technical solutions has the following advantages and beneficial effects:
in the pulse calibration method of the single-three-phase electric energy standard meter, the total measuring pulse period of the detected electric energy standard meter and the total standard pulse period of the reference electric energy standard meter are obtained; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter; obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse; and calibrating the electrical parameters of the detected electric energy standard meter according to the error coefficients, so as to realize the accurate calibration of the single-three-phase electric energy standard meter. According to the method and the device, the error coefficient is optimized, the electric parameters of the detected electric energy standard meter are calibrated through processing the obtained error coefficient, the relation between a measured value and a standard value can be accurately reflected, the calibration error of the single-three-phase electric energy standard meter is reduced, and therefore the calibration precision of the single-three-phase electric energy standard meter is improved.
Drawings
Fig. 1 is an application scenario diagram of a pulse calibration method of a single-phase and three-phase electric energy standard meter in the embodiment of the present application.
Fig. 2 is a first flowchart of a pulse calibration method of a single-three phase electric energy standard meter according to an embodiment of the present application.
Fig. 3 is a second flowchart of the pulse calibration method of the single-three phase electric energy standard meter in the embodiment of the present application.
Fig. 4 is a third flow chart schematic diagram of the pulse calibration method for the single-three phase electric energy standard meter in the embodiment of the present application.
Fig. 5 is a schematic structural diagram of a pulse calibration device of a single-three-phase electric energy standard meter in an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a pulse calibration system of a single-three-phase electric energy standard meter in an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, the term "plurality" shall mean two as well as more than two.
The traditional calibration method of the single-three phase electric energy standard meter comprises the calibration of voltage, current and phase angle.
For a conventional calibration voltage: on the checking device, a stable voltage is output by a standard source, the standard voltage value of the reference electric energy standard meter is read out by the PC calibration software through the serial server, the standard voltage value is issued to the detected electric energy standard meter through the serial server by the PC calibration software, the standard voltage value of the reference electric energy standard meter is compared with the self-testing voltage value by the detected electric energy standard meter, and a voltage comparison coefficient is calculated.
And setting the standard voltage value measured by the reference electric energy standard meter as RV, the self-test voltage value measured by the detected electric energy standard meter as LV, and the voltage comparison coefficient as KV, and calculating the KV by calculating the following formula.
The detected electric energy standard meter can calibrate the voltage measurement value to the standard voltage value of the reference electric energy standard meter through the coefficient KV.
For a conventional calibration current: on the checking device, a standard source outputs a stable current, the PC calibration software reads out the standard current value of the reference electric energy standard meter through the serial server, the PC calibration software issues the standard current value to the detected electric energy standard meter through the serial server, and the detected electric energy standard meter compares the standard current value of the reference electric energy standard meter with the self-testing current value to calculate a current comparison coefficient.
And setting the standard current value measured by the reference electric energy standard meter as RI, and the self-test current value measured by the detected electric energy standard meter as LI, and the current comparison coefficient as KI, and calculating KI by calculating the following formula.
The detected electric energy standard meter can calibrate the current measurement value to the standard current value of the reference electric energy standard meter through a coefficient KI.
For a conventional calibration phase angle: on the checking device, a standard source outputs stable power, the included angle between voltage and current is set to be 0.5L, the PC calibration software reads out the standard phase angle value of the reference electric energy standard meter through the serial server, the PC calibration software issues the standard phase angle value to the detected electric energy standard meter through the serial server, and the detected electric energy standard meter compares the standard phase angle value of the reference electric energy standard meter with the self-testing phase angle value to calculate the phase angle difference value.
And setting the phase angle value measured by the reference electric energy standard meter as R theta, the phase angle value measured by the detected electric energy standard meter as L theta and the phase angle difference as K theta, and calculating the K theta by calculating the following formula.
Kθ＝Rθ-Lθ
The phase angle measurement value of the detected electric energy standard meter can be calibrated to the phase angle measurement value of the reference electric energy standard meter through the phase angle difference value K theta.
In the calibration mode of the conventional single-three phase electric energy standard meter, calibration software of the PC reads the standard value of the reference electric energy standard meter and then issues the standard value to the detected electric energy standard meter, and the measured value and the standard value of the detected electric energy standard meter are synchronous, so that the calculated voltage comparison coefficient, current comparison coefficient and phase angle difference inevitably have synchronous errors, and the relation between the measured value and the standard value cannot be accurately reflected, so that the calibration error of the single-three phase electric energy standard meter is large.
According to the pulse calibration method, device and system of the single-three-phase electric energy standard meter, the pulse calibration scheme is summarized, the error coefficient is optimized, the influence of asynchronous measurement in the traditional scheme is avoided, the measurement numerical value error of the detected electric energy standard meter can be reflected more accurately, and the calibration precision of the single-three-phase electric energy standard meter is further improved.
The pulse calibration method of the single-phase and three-phase electric energy standard meter can be applied to the application environment shown in fig. 1. The processing device may include a processor 102 and a memory 104, and the memory 104 may be used to store data such as a total period of the measured pulse, a total period of the standard pulse, and a calculated error coefficient. The processor 102 is configured to obtain a total period of a measurement pulse of the standard meter of the detected electric energy and a total period of a standard pulse of the standard meter of the reference electric energy; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter; obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse; and calibrating the electrical parameters of the standard meter of the detected electrical energy according to the error coefficient. The processing device may also include a display 106, and the display 106 may display data such as error coefficients via a graphical interface. In one example, the processing device may be, but is not limited to, a desktop computer, a notebook computer, or a tablet computer.
The method aims to solve the problem that in the existing calibration mode of the single-three phase electric energy standard meter, the calculated calibration coefficient has synchronization errors, and the relationship between a measured value and a standard value cannot be accurately reflected, so that the calibration error of the single-three phase electric energy standard meter is large. In one embodiment, as shown in fig. 2, a pulse calibration method for a single three-phase power standard meter is provided, which is illustrated by applying the method to the processor 102 in fig. 1, and includes the following steps:
step S210, acquiring a total measuring pulse period of the detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; and the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
The standard meter of the detected electric energy can be a single three-phase multifunctional electric energy standard meter, for example, the standard meter of the detected electric energy can be a single three-phase multifunctional electric energy standard meter with model number LY 331. The reference electric energy standard meter may be a three-phase electric energy standard meter, for example, the reference electric energy standard meter may be a lightning RX33 model reference electric energy standard meter.
The total pulse period is obtained by processing the electric measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm. And the standard pulse total period refers to the pulse total period obtained by processing the electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
For example, if the number of calibrated pulses is set to be n, the total period of the measured pulses is the total period TL of the n pulses output by the standard meter of the detected electric energy; the standard pulse total period is a total period TR of n pulses output by the reference power standard meter.
And step S220, obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse.
The total period of the measurement pulse and the total period of the standard pulse are processed, so that an error value between the total period of the measurement pulse and the total period of the standard pulse is calculated, namely an error coefficient obtained by processing can be used for representing an error coefficient between the measured values of the detected electric energy standard meter and the reference electric energy standard meter.
And step S230, calibrating the electrical parameters of the detected electrical energy standard meter according to the error coefficient.
And the processor calibrates the electrical parameters of the detected standard electric energy meter according to the processed error coefficient, so as to calibrate the measured values of the corresponding electrical parameters of the detected standard electric energy meter.
In the embodiment, the total measuring pulse period of the detected electric energy standard meter and the total standard pulse period of the reference electric energy standard meter are obtained; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter; obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse; and calibrating the electrical parameters of the detected standard electric energy meter according to the error coefficients, so as to realize the accurate calibration of the single-phase and three-phase standard electric energy meter. The method comprises the steps of obtaining a measurement pulse total period and a standard pulse total period through processing, reflecting the change of measurement value values synchronously in real time by the measurement pulse total period and the standard pulse total period, calibrating the electrical parameters of the detected electric energy standard meter through processing the obtained error coefficient, avoiding the influence of asynchronous measurement in the traditional scheme by the error coefficient, reflecting the measurement value error of the detected electric energy standard meter and the reference electric energy standard meter more accurately, further reflecting the relation between the measurement value and the standard value accurately, reducing the calibration error of the single-three-phase electric energy standard meter, and improving the calibration precision of the single-three-phase electric energy standard meter.
In one example, as shown in fig. 3, a pulse calibration method for a single three-phase power standard meter is provided, which is illustrated by applying the method to the processor 102 in fig. 1, and includes the following steps:
step S310, acquiring a total measuring pulse period of the detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; and the standard pulse total period is obtained by processing the electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
For the detailed description of the step S310, please refer to the description of the above embodiments, which is not repeated herein.
Step S320, performing difference processing on the total standard pulse period and the total measurement pulse period to obtain a first difference.
Illustratively, the total measuring pulse period is obtained by processing the electric measuring value through a standard meter of the detected electric energy according to a pulse conversion algorithm. And processing the electric standard value according to a pulse conversion algorithm by referring to the electric energy standard meter to obtain a standard pulse total period. Wherein the pulse conversion algorithm may include a first conversion formula and a second conversion formula. The first conversion formula is:
wherein D is an electrical measurement value or an electrical standard value, C is a pulse constant, and Δ t is a measurement pulse period or a standard pulse period.
The second conversion formula is:
wherein n is the number of pulses, Δ t t For each measuring pulse period or each standard pulse period, T is the total measuring pulse period or the total standard pulse period.
The electrical measurement value refers to a value measured by the detected electric energy standard meter, and the electrical standard value refers to a value measured by the reference electric energy standard meter. The measuring pulse period refers to the period of 1 pulse output by the detected electric energy standard meter. The standard pulse total period refers to a period of 1 pulse output with reference to the power standard meter.
And setting the total standard pulse period as TR and the total measurement pulse period as TL, and performing difference processing on the total standard pulse period and the total measurement pulse period by the processor to obtain a first difference value, namely the first difference value is TR-TL.
And step S330, taking the first difference value as a dividend, and carrying out division processing on the first difference value and the total period of the measuring pulse to obtain an error coefficient.
Setting the error coefficient as KT, the processor performs division processing on the first difference value and the total period of the measurement pulse by taking the first difference value as a dividend, and further obtains the error coefficient, namely the error coefficient KT is:
and step S340, calibrating the electrical parameters of the standard meter of the detected electrical energy according to the error coefficient.
For the detailed description of the step S340, please refer to the description of the above embodiments, which is not repeated herein.
In the above embodiment, the total period of the measurement pulse and the total period of the standard pulse are obtained through processing, the total period of the measurement pulse and the total period of the standard pulse reflect the change of the measurement value synchronously in real time, the error coefficient is obtained through processing, the electrical parameter of the detected electric energy standard meter is calibrated, the error coefficient avoids the influence of asynchronous measurement in the traditional scheme, the measurement value error of the detected electric energy standard meter and the reference electric energy standard meter is reflected more accurately, the relation between the measurement value and the standard value can be accurately reflected, the calibration error of the single-three-phase electric energy standard meter is reduced, and therefore the calibration accuracy of the single-three-phase electric energy standard meter is improved.
In one example, the electrical measurement is a voltage measurement; the electric standard value is a voltage standard value.
The step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises the following steps:
obtaining a voltage error coefficient according to the total pulse period of the voltage measurement and the total pulse period of the voltage standard; the total period of the voltage measurement pulse is obtained by processing a voltage measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the voltage standard pulse is obtained by processing a voltage standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
The voltage measurement value refers to a voltage value measured by the detected electric energy standard meter; the voltage standard value refers to a voltage value measured by referring to an electric energy standard meter. Processing the voltage measurement value through a standard meter of the detected electric energy according to a pulse conversion algorithm to further obtain the total pulse period of the voltage measurement; and processing the voltage standard value according to a pulse conversion algorithm by referring to the electric energy standard meter so as to obtain the total period of the voltage standard pulse. The processor acquires the total period of the voltage measurement pulse and the total period of the voltage standard pulse, processes the total period of the voltage measurement pulse and the total period of the voltage standard pulse, and further obtains a voltage error coefficient, namely the processed voltage error coefficient can be used for representing the voltage error coefficient between the voltage measurement value of the detected electric energy standard meter and the voltage measurement value of the reference electric energy standard meter.
Furthermore, the processor calibrates the measured voltage of the detected electric energy standard meter according to the processed voltage error coefficient, so that the measured value of the voltage of the detected electric energy standard meter is calibrated, the relation between the voltage measured value and the voltage standard value can be accurately reflected, the calibration error of the single-three-phase electric energy standard meter is reduced, and the voltage calibration precision of the single-three-phase electric energy standard meter is improved.
In one example, the electrical measurement is a current measurement; the electric standard value is a current standard value.
The step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises the following steps:
obtaining a current error coefficient according to the total pulse period of the current measurement and the total pulse period of the current standard; the total current measurement pulse period is obtained by processing a current measurement value by the detected electric energy standard meter according to a pulse conversion algorithm; and the total period of the current standard pulse is obtained by processing a current standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
The current measurement value refers to a current value measured by the detected electric energy standard meter; the current standard value refers to a current value measured by referring to an electric energy standard meter. Processing the current measurement value through the detected electric energy standard meter according to a pulse conversion algorithm to further obtain the total pulse period of the current measurement; and processing the current standard value according to a pulse conversion algorithm by referring to the electric energy standard meter so as to obtain the total period of the current standard pulse. The processor obtains the total period of the current measurement pulse and the total period of the current standard pulse, processes the total period of the current measurement pulse and the total period of the current standard pulse, and further obtains a current error coefficient, namely the processed current error coefficient can be used for representing the current error coefficient between the current measurement value of the detected electric energy standard meter and the current measurement value of the reference electric energy standard meter.
Furthermore, the processor calibrates the measured current of the detected electric energy standard meter according to the processed current error coefficient, so as to calibrate the measured current value of the detected electric energy standard meter, accurately reflect the relation between the measured current value and the current standard value, reduce the calibration error of the single-three phase electric energy standard meter, and improve the current calibration precision of the single-three phase electric energy standard meter.
In one example, the electrical measurement is a power measurement; the electrical standard value is a power standard value.
The step of obtaining the error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises the following steps:
obtaining a power error coefficient according to the total period of the power measurement pulse and the total period of the power standard pulse; the total period of the power measurement pulse is obtained by processing the power measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the power standard pulse is obtained by processing a power standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
Wherein, the power measured value refers to a power value measured by the standard meter of the detected electric energy; the power standard value refers to a power value measured by referring to an electric energy standard meter. Processing the power measured value through a standard meter of the detected electric energy according to a pulse conversion algorithm to further obtain the total pulse period of the power measurement; and processing the power standard value according to a pulse conversion algorithm by referring to the electric energy standard meter so as to obtain the total period of the power standard pulse. The processor obtains the total period of the power measurement pulse and the total period of the power standard pulse, processes the total period of the power measurement pulse and the total period of the power standard pulse, and further obtains a power error coefficient, namely the power error coefficient obtained by processing can be used for representing the power error coefficient between the power measured values of the detected electric energy standard meter and the reference electric energy standard meter.
Furthermore, the processor calibrates the measured power of the detected electric energy standard meter according to the processed power error coefficient, so as to calibrate the measured value of the power of the detected electric energy standard meter, accurately reflect the relation between the measured value of the power and the power standard value, reduce the calibration error of the single three-phase electric energy standard meter, and improve the power calibration precision of the single three-phase electric energy standard meter.
In one embodiment, as shown in fig. 4, a pulse calibration method for a single three-phase power standard meter is provided, which is illustrated by applying the method to the processor 102 in fig. 1, and includes the following steps:
step S410, obtaining a power error coefficient according to the total period of the power measurement pulse and the total period of the power standard pulse; the total period of the power measurement pulse is obtained by processing the power measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the power standard pulse is obtained by processing a power standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
For the detailed description of the step S410, please refer to the description of the above embodiments, which is not repeated herein.
Step S420, based on the power phase angle conversion algorithm, the power error coefficient, the power measured value and the power standard value are processed to obtain a phase angle difference value.
Illustratively, the power phase angle transformation algorithm is:
wherein, theta R For the phase angle measured with reference to the electric energy standard meter, KP is the power error coefficient, and Delta theta is the phase angle difference.
In one example, if the total period of the power standard pulse is PR, the total period of the power measurement pulse is PL, and the power error coefficient is KP, then as can be seen from P = U × I × cos θ,
wherein, theta R Phase angle, theta, measured for reference to a standard meter of electric energy L The phase angle measured for the standard meter of the detected electric energy.
The power is calibrated at 0.5L,
θ R and theta L Is recorded as delta theta, then>
Expanded by a Taylor series of a cosine function cos, based on the sum of the coefficients>
Taking the first 5 series, will>
After the expansion, Δ θ was obtained by using a newton iteration method. Then Δ θ is the phase angle difference.
And step S430, calibrating the phase angle parameter of the standard meter of the detected electric energy according to the phase angle difference value.
And the processor calibrates the phase angle parameter of the detected electric energy standard meter according to the processed phase angle difference value, so as to calibrate the measured value of the corresponding phase angle parameter of the detected electric energy standard meter.
In the above embodiment, the phase angle parameter of the detected electric energy standard meter is calibrated by processing the obtained phase angle difference, the phase angle difference avoids the influence of asynchronous measurement in the traditional scheme, and more accurately reflects the phase angle measurement numerical error of the detected electric energy standard meter and the reference electric energy standard meter, so that the relationship between the phase angle measurement value and the standard value can be accurately reflected, the phase angle calibration error of the single three-phase electric energy standard meter is reduced, and the phase angle calibration precision of the single three-phase electric energy standard meter is improved.
It should be understood that although the various steps in the flow diagrams of fig. 2-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, there is provided a pulse calibration apparatus for a single three-phase power standard meter, the pulse calibration apparatus for a single three-phase power standard meter comprising:
a pulse period acquiring unit 510, configured to acquire a total period of a measurement pulse of the detected electric energy standard meter and a total period of a standard pulse of the reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the electric energy to be detected according to a pulse conversion algorithm; and the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by referring to an electric energy standard meter.
And an error coefficient processing unit 520, configured to obtain an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse.
And the calibration unit 530 is configured to calibrate the electrical parameter of the standard meter of detected electrical energy according to the error coefficient.
For specific definition of the pulse calibration device of the single-three phase electric energy standard meter, reference may be made to the above definition of the pulse calibration method of the single-three phase electric energy standard meter, and details are not repeated here. All or part of each module in the pulse calibration device of the single-three phase electric energy standard meter can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of an error verification module in a pulse calibration system of the single-three-phase electric energy standard meter, and can also be stored in a memory in the pulse calibration system of the single-three-phase electric energy standard meter in a software form, so that the error verification module can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 6, there is also provided a pulse calibration system for a single three-phase electric energy standard meter, the system includes several standard meters 610 to be tested, an error verification module 620, a reference electric energy standard meter 630 and a three-phase standard power source 640; the three-phase standard power source 640 is respectively connected with the reference electric energy standard meter 630 and each detected electric energy standard meter 610; the error verification module 620 is respectively connected with the reference electric energy standard meter 630 and each detected electric energy standard meter 610. The error verification module 620 is used for executing the steps of the pulse calibration method of any one of the single-phase and three-phase electric energy standard meters.
The standard electric energy meter 610 to be tested may be a single-phase and three-phase multifunctional standard electric energy meter, and the reference electric energy standard meter 630 may be a three-phase standard electric energy meter with the model number of the lightning RX 33. The error-verification module 620 may include a plurality of error-verification units. The pulse output end of each standard meter 610 is connected with the input end of the detected pulse of the error detecting unit. The standard pulse output end of the reference electric energy standard meter 630 is connected with the standard pulse input end of the error verification unit. Each error calibration unit is connected with the pulse port of each standard meter 610 to be tested in a one-to-one correspondence manner. Each detected electric energy standard meter 610 comprises a standard pulse TTL signal output end, the error verification unit comprises a detected pulse input end and a standard pulse input end, the standard pulse output end of the reference electric energy standard meter 630 is connected with the standard pulse input ends of the plurality of error verification units, and each detected electric energy standard meter 610 corresponds to one error verification unit.
For example, the error verification module 620 may be used to perform the following steps of the pulse calibration method for a single three-phase power standard meter: acquiring the total measuring pulse period of the detected electric energy standard meter 610 and the total standard pulse period of the reference electric energy standard meter 630; the total measuring pulse period is obtained by processing the electric measuring value by the standard meter 610 of the detected electric energy according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electrical standard value according to a pulse conversion algorithm with reference to the electric energy standard meter 630. And obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse. And calibrating the electrical parameters of the detected electrical energy standard meter 610 according to the error coefficients.
Specifically, the total period of the measured pulse is obtained through processing of the standard electric energy meter 610 to be detected, the total period of the standard pulse is obtained through processing of the reference electric energy meter 630, the total period of the measured pulse and the total period of the standard pulse reflect the change of the measured value in real time and synchronously, the electrical parameter of the standard electric energy meter to be detected is calibrated through an error coefficient obtained through processing of the error calibration module 620, the error coefficient avoids the influence of asynchronous measurement in the traditional scheme, the error of the measured value of the standard electric energy meter to be detected and the error of the measured value of the reference electric energy meter are reflected more accurately, the relation between the measured value and the standard value can be reflected accurately, the calibration error of the single-three phase electric energy standard meter is reduced, and therefore the calibration accuracy of the single-three phase electric energy standard meter is improved.
In one embodiment, there is further provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for pulse calibration of a single three-phase power standard meter according to any of the preceding claims.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the division methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A pulse calibration method of a single three-phase electric energy standard meter is characterized by comprising the following steps:
acquiring a total measuring pulse period of a detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value by the standard meter of the detected electric energy according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value according to a pulse conversion algorithm by the reference electric energy standard meter;
obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse;
and calibrating the electrical parameters of the standard meter of the detected electrical energy according to the error coefficient.
2. The method for calibrating the pulses of a single-three-phase electric energy standard meter according to claim 1, wherein the step of obtaining the error coefficient according to the total period of the measurement pulses and the total period of the standard pulses comprises:
performing difference processing on the standard pulse total period and the measurement pulse total period to obtain a first difference;
and dividing the first difference value and the total period of the measuring pulse by taking the first difference value as a dividend to obtain the error coefficient.
3. The method for pulse calibration of a single three-phase electric energy standard meter according to claim 1, wherein the pulse conversion algorithm comprises a first conversion formula and a second conversion formula;
the first conversion formula is:
wherein D is an electrical measurement value or an electrical standard value, C is a pulse constant, and Δ t is a measurement pulse period or a standard pulse period;
the second conversion formula is:
wherein n is the number of pulses, Δ t t For each measuring pulse period or each standard pulse period, T is the total measuring pulse period or the total standard pulse period.
4. The method of pulse calibration of a single three phase power standard meter according to claim 3, wherein the electrical measurements are voltage measurements; the electric standard value is a voltage standard value;
the step of obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises:
obtaining a voltage error coefficient according to the total pulse period of the voltage measurement and the total pulse period of the voltage standard; the total period of the voltage measurement pulse is obtained by processing the voltage measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the voltage standard pulse is obtained by processing the voltage standard value by the reference electric energy standard meter according to a pulse conversion algorithm.
5. The method of pulse calibration of a single three phase power standard meter according to claim 3, wherein the electrical measurements are current measurements; the electric standard value is a current standard value;
the step of obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises:
obtaining a current error coefficient according to the total pulse period of the current measurement and the total pulse period of the current standard; the total current measurement pulse period is obtained by processing the current measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the current standard pulse is obtained by processing the current standard value by the reference electric energy standard meter according to a pulse conversion algorithm.
6. The method of pulse calibration of a single three phase power standard meter according to claim 3, wherein the electrical measurement is a power measurement; the electrical standard value is a power standard value;
the step of obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse comprises:
obtaining a power error coefficient according to the total period of the power measurement pulse and the total period of the power standard pulse; the total period of the power measurement pulse is obtained by processing the power measurement value by the standard meter of the detected electric energy according to a pulse conversion algorithm; and the total period of the power standard pulse is obtained by processing the power standard value by the reference electric energy standard meter according to a pulse conversion algorithm.
7. The method of claim 6, wherein the step of obtaining the power error coefficient according to the total period of the power measurement pulse and the total period of the power standard pulse is followed by the steps of:
processing the power error coefficient, the power measured value and the power standard value based on a power phase angle conversion algorithm to obtain a phase angle difference value;
the step of calibrating the electrical parameters of the standard meter of the detected electrical energy according to the error coefficient comprises the following steps:
and calibrating the phase angle parameter of the standard meter of the detected electric energy according to the phase angle difference value.
8. The method of pulse calibration of a single three phase power standard meter according to claim 7,
the power phase angle conversion algorithm is as follows:
wherein, theta R And KP is the power error coefficient and delta theta is the phase angle difference value measured by referring to the electric energy standard meter.
9. The utility model provides a pulse calibrating device of single three-phase electric energy standard meter which characterized in that includes:
the pulse period acquisition unit is used for acquiring the total measurement pulse period of the detected electric energy standard meter and the total standard pulse period of the reference electric energy standard meter; the total measuring pulse period is obtained by processing the electric measuring value of the standard meter of the detected electric energy according to a pulse conversion algorithm; the standard pulse total period is obtained by processing an electric standard value by the reference electric energy standard meter according to a pulse conversion algorithm;
the error coefficient processing unit is used for obtaining an error coefficient according to the total period of the measurement pulse and the total period of the standard pulse;
and the calibration unit is used for calibrating the electrical parameters of the detected electrical energy standard meter according to the error coefficient.
10. A pulse calibration system of a single three-phase electric energy standard meter is characterized by comprising a plurality of detected electric energy standard meters, an error verification module, a reference electric energy standard meter and a three-phase standard power source;
the three-phase standard power source is respectively connected with the reference electric energy standard meter and each detected electric energy standard meter; the error verification module is respectively connected with the reference electric energy standard meter and each detected electric energy standard meter;
the error verification module is used for executing the steps of the pulse calibration method of the single three-phase electric energy standard meter according to any one of claims 1 to 8.
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