Pulse calibration method, device and system for single three-phase electric energy standard meter

Abstract

The application relates to a pulse calibration method, device and system of a single three-phase electric energy standard meter, the method comprises the following steps: obtaining a total measurement pulse period of a detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measurement pulse period is obtained by processing an electric measurement value according to a pulse conversion algorithm; the total standard pulse period is obtained by processing an electric standard value according to the pulse conversion algorithm; obtaining an error coefficient according to the total measurement pulse period and the total standard pulse period; and calibrating an electric parameter of the detected electric energy standard meter according to the error coefficient, so as to realize accurate calibration of the single three-phase electric energy standard meter. The application optimizes the error coefficient, calibrates the electric parameter of the detected electric energy standard meter according to the obtained error coefficient, can accurately reflect the relationship between the measurement value and the standard value, reduces the calibration error of the single three-phase electric energy standard meter, and thus improves the calibration accuracy of the single three-phase electric energy standard meter.

Description

Technical Field

[0001] This application relates to the field of electricity meter calibration technology, and in particular to a pulse calibration method, device and system for single-phase and three-phase electricity standard meters. Background Technology

[0002] With the continuous development of smart grid construction, higher requirements are placed on the metering accuracy of smart energy meters, as well as on calibration equipment. Energy standard meters, also known as portable precision energy meters, are mainly used to verify the errors of other energy meters. Energy standard meters generally refer to energy meters that serve as the measurement standard in value transfer. Energy standard meters are primarily used to verify the accuracy of installed energy meters and low-level standard energy meters to ensure the accuracy of these meters' measurements.

[0003] Currently, in the existing calibration methods for single-phase and three-phase power standard meters, the acquisition processes of measured values ​​and standard values ​​are not synchronized. The calculated calibration coefficients inevitably have synchronization errors and cannot accurately reflect the relationship between measured values ​​and standard values, resulting in large calibration errors for single-phase and three-phase power standard meters. Summary of the Invention

[0004] Therefore, it is necessary to address the problem that the calibration coefficients calculated in the existing calibration methods for single- and three-phase energy standard meters have synchronization errors, which cannot accurately reflect the relationship between the measured value and the standard value, resulting in large calibration errors in single- and three-phase energy standard meters. A pulse calibration method, device, and system for single- and three-phase energy standard meters that can improve the calibration accuracy of such meters should be provided.

[0005] In a first aspect, this application provides a pulse calibration method for a single-phase or three-phase power standard meter, comprising the following steps:

[0006] Obtain the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter; the total measurement pulse period is obtained by processing the electrical measurement value of the tested energy standard meter according to the pulse conversion algorithm; the total standard pulse period is obtained by processing the electrical standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0007] The error coefficient is obtained based on the total period of the measured pulse and the total period of the standard pulse;

[0008] The electrical parameters of the tested electrical energy standard meter are calibrated based on the error coefficient.

[0009] Optionally, the steps for obtaining the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0010] The difference between the total period of the standard pulse and the total period of the measured pulse is processed to obtain the first difference;

[0011] Using the first difference as the dividend, divide the first difference by the total period of the measured pulse to obtain the error coefficient.

[0012] Optionally, the pulse conversion algorithm includes a first conversion formula and a second conversion formula;

[0013] The first conversion formula is:

[0014]

[0015] Where D is the electrical measurement value or electrical standard value, C is the pulse constant, and Δt is one measurement pulse period or one standard pulse period;

[0016] The second conversion formula is:

[0017]

[0018] Where n is the number of pulses, Δt t For each measurement pulse cycle or each standard pulse cycle, T is the total measurement pulse cycle or the total standard pulse cycle.

[0019] Optionally, the electrical measurement value is the voltage measurement value; the electrical standard value is the voltage standard value.

[0020] The steps to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0021] The voltage error coefficient is obtained based on the total period of the voltage measurement pulse and the total period of the voltage standard pulse. The total period of the voltage measurement pulse is obtained by processing the voltage measurement value of the tested energy standard meter according to the pulse conversion algorithm. The total period of the voltage standard pulse is obtained by processing the voltage standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0022] Optionally, the electrical measurement value is the current measurement value; the electrical standard value is the current standard value.

[0023] The steps to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0024] The current error coefficient is obtained based on the total period of the current measurement pulse and the total period of the current standard pulse. The total period of the current measurement pulse is obtained by processing the current measurement value of the tested energy standard meter according to the pulse conversion algorithm. The total period of the current standard pulse is obtained by processing the current standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0025] Optionally, the electrical measurement value is the power measurement value; the electrical standard value is the power standard value.

[0026] The steps to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0027] The power error coefficient is obtained based on 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 of the tested energy standard meter according to the pulse conversion algorithm. The total period of the power standard pulse is obtained by processing the power standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0028] Optionally, after obtaining the power error coefficient based on the total period of the power measurement pulse and the total period of the power standard pulse, the following steps are included:

[0029] Based on the power phase angle conversion algorithm, the power error coefficient, power measurement value and power standard value are processed to obtain the phase angle difference;

[0030] The steps for calibrating the electrical parameters of the tested energy standard meter, based on the error coefficient, include:

[0031] The phase angle parameters of the tested electrical energy standard meter are calibrated based on the phase angle difference.

[0032] Optionally, the power phase angle conversion algorithm is as follows:

[0033]

[0034] Where, θ R The phase angle is measured with reference to the standard power meter, KP is the power error coefficient, and Δθ is the phase angle difference.

[0035] Secondly, this application provides a pulse calibration device for a single-phase or three-phase power standard meter, the pulse calibration device for the single-phase or three-phase power standard meter includes;

[0036] The pulse period acquisition unit is used to acquire the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter; the total measurement pulse period is obtained by the tested energy standard meter processing the electrical measurement value according to the pulse conversion algorithm; the total standard pulse period is obtained by the reference energy standard meter processing the electrical standard value according to the pulse conversion algorithm.

[0037] The error coefficient processing unit is used to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse;

[0038] The calibration unit is used to calibrate the electrical parameters of the tested energy standard meter according to the error coefficient.

[0039] Thirdly, this application provides a pulse calibration system for single-phase and three-phase power standard meters, including several power standard meters under test, an error verification module, a reference power standard meter, and a three-phase standard power source;

[0040] The three-phase standard power source is connected to the reference energy standard meter and each tested energy standard meter respectively; the error verification module is connected to the reference energy standard meter and each tested energy standard meter respectively.

[0041] The error verification module is used to perform the steps of any of the pulse calibration methods for single-phase and three-phase power standard meters mentioned above.

[0042] One of the above technical solutions has the following advantages and beneficial effects:

[0043] In the aforementioned pulse calibration method for single-phase and three-phase energy standard meters, the total period of the measured pulses of the energy standard meter under test and the total period of the standard pulses of the reference energy standard meter are obtained. The total period of the measured pulses is obtained by processing the electrical measured value of the energy standard meter under test according to a pulse conversion algorithm; the total period of the standard pulses is obtained by processing the electrical standard value of the reference energy standard meter according to a pulse conversion algorithm. An error coefficient is obtained based on the total period of the measured pulses and the total period of the standard pulses. Based on the error coefficient, the electrical parameters of the energy standard meter under test are calibrated, thereby achieving accurate calibration of the single-phase and three-phase energy standard meter. This application optimizes the error coefficient. By processing the obtained error coefficient, the electrical parameters of the energy standard meter under test are calibrated, thus accurately reflecting the relationship between the measured value and the standard value, reducing the calibration error of the single-phase and three-phase energy standard meter, and improving the calibration accuracy of the single-phase and three-phase energy standard meter. Attached Figure Description

[0044] Figure 1 This is a schematic diagram illustrating the application scenario of the pulse calibration method for single-phase and three-phase power standard meters in this application.

[0045] Figure 2 This is a schematic diagram of the first process of the pulse calibration method for a single-phase or three-phase power standard meter in this application embodiment.

[0046] Figure 3 This is a schematic diagram of the second process of the pulse calibration method for single-phase and three-phase power standard meters in the embodiments of this application.

[0047] Figure 4 This is a schematic diagram of the third process of the pulse calibration method for a single-phase or three-phase power standard meter in this application embodiment.

[0048] Figure 5 This is a schematic diagram of the pulse calibration device for a single-phase or three-phase power standard meter in an embodiment of this application.

[0049] Figure 6 This is a schematic diagram of the pulse calibration system for a single-phase or three-phase power standard meter in an embodiment of this application. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] In addition, the term "multiple" should mean two or more.

[0053] The traditional calibration method for single-phase and three-phase power meters includes calibration of voltage, current and phase angle.

[0054] For traditional calibration voltage: On the calibration device, the standard source outputs a stable voltage. The PC calibration software reads the standard voltage value of the reference energy standard meter through the serial port server. The PC calibration software sends the standard voltage value to the energy standard meter under test through the serial port server. The energy standard meter under test compares the standard voltage value of the reference energy standard meter with the self-tested voltage value and calculates the voltage comparison coefficient.

[0055] If the standard voltage measured by the reference energy standard meter is set to RV, the self-test voltage measured by the tested energy standard meter is LV, and the voltage comparison coefficient is KV, then KV can be calculated using the following formula.

[0056]

[0057] The voltage measurement value of the tested electrical energy standard meter can be calibrated to the standard voltage value of the reference electrical energy standard meter by using the coefficient KV.

[0058] For traditional calibration current: On the calibration device, the standard source outputs a stable current. The PC calibration software reads the standard current value of the reference energy standard meter through the serial port server. The PC calibration software sends the standard current value to the energy standard meter under test through the serial port server. The energy standard meter under test compares the standard current value of the reference energy standard meter with the self-tested current value and calculates the current comparison coefficient.

[0059] Let RI be the standard current measured by the reference energy standard meter, LI be the self-tested current measured by the tested energy standard meter, and KI be the current comparison coefficient. Then, KI can be calculated using the following formula.

[0060]

[0061] The tested energy standard meter can be calibrated to the standard current value of the reference energy standard meter by using the coefficient KI.

[0062] For traditional phase angle calibration: On the calibration device, the standard source outputs a stable power, and the angle between the voltage and current is set to 0.5L. The PC calibration software reads the standard phase angle value of the reference energy standard meter through the serial port server. The PC calibration software sends the standard phase angle value to the energy standard meter under test through the serial port server. The energy standard meter under test compares the standard phase angle value of the reference energy standard meter with the self-tested phase angle value and calculates the phase angle difference.

[0063] If the phase angle measured by the reference energy standard meter is set to Rθ, the phase angle measured by the tested energy standard meter is set to Lθ, and the phase angle difference is set to Kθ, then Kθ can be calculated using the following formula.

[0064] Kθ=Rθ-Lθ

[0065] The tested energy standard meter can calibrate its phase angle measurement to the phase angle measurement of the reference energy standard meter by using the phase angle difference Kθ.

[0066] In the above-mentioned traditional calibration method for single-phase and three-phase energy standard meters, the calibration software of the PC reads the standard value of the reference energy standard meter and then sends it to the energy standard meter under test. During this process, there is a synchronization problem between the measured value of the energy standard meter under test and the standard value. The calculated voltage comparison coefficient, current comparison coefficient and phase angle difference inevitably have synchronization errors, which cannot accurately reflect the relationship between the measured value and the standard value, resulting in a large calibration error of the single-phase and three-phase energy standard meter.

[0067] The pulse calibration method, apparatus and system for single and three-phase energy standard meters provided in this application optimizes the error coefficient by summarizing the pulse calibration scheme, avoiding the influence of asynchronous measurement in the traditional scheme, and can more accurately reflect the measurement error of the energy standard meter under test, thereby improving the calibration accuracy of single and three-phase energy standard meters.

[0068] The pulse calibration method for single-phase and three-phase power standard meters provided in this application can be applied to, for example... Figure 1 In the application environment shown, the processing device may include a processor 102 and a memory 104. The memory 104 can be used to store data such as the total period of the measurement pulses, the total period of the standard pulses, and the calculated error coefficients. The processor 102 can be used to acquire the total period of the measurement pulses of the tested energy standard meter and the total period of the standard pulses of the reference energy standard meter. The total period of the measurement pulses is obtained by processing the electrical measurement value of the tested energy standard meter according to a pulse conversion algorithm. The total period of the standard pulses is obtained by processing the electrical standard value of the reference energy standard meter according to a pulse conversion algorithm. The error coefficient is obtained based on the total period of the measurement pulses and the total period of the standard pulses. The electrical parameters of the tested energy standard meter are calibrated based on the error coefficients. The processing device may also include a display 106, which can display the error coefficients and other data through a graphical interface. In one example, the processing device may be, but is not limited to, a desktop computer, a laptop computer, or a tablet computer.

[0069] To address the issue of large calibration errors in existing single-phase and three-phase energy standard meters due to synchronization errors in the calculated calibration coefficients, which fail to accurately reflect the relationship between measured and standard values, a solution is proposed in one embodiment. Figure 2 As shown, a pulse calibration method for single-phase and three-phase energy standard meters is provided, which is then applied to... Figure 1 Taking processor 102 as an example, the method includes the following steps:

[0070] Step S210: Obtain the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter; the total measurement pulse period is obtained by the tested energy standard meter processing the electrical measurement value according to the pulse conversion algorithm; the total standard pulse period is obtained by the reference energy standard meter processing the electrical standard value according to the pulse conversion algorithm.

[0071] The tested energy standard meter can be a single-phase or three-phase multi-functional energy standard meter. For example, the tested energy standard meter can be the LY331 model single-phase or three-phase multi-functional energy standard meter. The reference energy standard meter can be a three-phase energy standard meter. For example, the reference energy standard meter can be the Leidian RX33 model reference energy standard meter.

[0072] The total pulse period of the measurement refers to the total pulse period obtained by the tested energy standard meter after processing the electrical measurement value according to the pulse conversion algorithm. The standard total pulse period refers to the total pulse period obtained by referring to the energy standard meter after processing the electrical standard value according to the pulse conversion algorithm.

[0073] For example, if the number of calibration pulses is set to n, then the total period of the measurement pulses is the total period TL of the n pulses output by the tested energy standard meter; the total period of the standard pulses is the total period TR of the n pulses output by the reference energy standard meter.

[0074] Step S220: Obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse.

[0075] By processing the total period of the measured pulse and the total period of the standard pulse, the error value between the total period of the measured pulse and the total period of the standard pulse can be calculated. That is, the error coefficient obtained by the processing can be used to represent the error coefficient between the measured value of the tested energy standard meter and the reference energy standard meter.

[0076] Step S230: Calibrate the electrical parameters of the tested electrical energy standard meter according to the error coefficient.

[0077] The processor calibrates the electrical parameters of the tested energy standard meter based on the error coefficient obtained from the processing, thereby calibrating the measured values ​​of the corresponding electrical parameters of the tested energy standard meter.

[0078] In the above embodiments, the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter are obtained. The total measurement pulse period is obtained by processing the electrical measurement value of the tested energy standard meter according to a pulse conversion algorithm; the total standard pulse period is obtained by processing the electrical standard value of the reference energy standard meter according to a pulse conversion algorithm. An error coefficient is obtained based on the total measurement pulse period and the total standard pulse period. Based on the error coefficient, the electrical parameters of the tested energy standard meter are calibrated, achieving accurate calibration of the single-phase and three-phase energy standard meters. By processing and obtaining the total measurement pulse period and the total standard pulse period, the changes in the measured values ​​are reflected in real time synchronously. The error coefficient obtained through processing is used to calibrate the electrical parameters of the tested energy standard meter. The error coefficient avoids the influence of asynchronous measurements in traditional schemes, more accurately reflects the measurement value errors of the tested energy standard meter and the reference energy standard meter, and thus accurately reflects the relationship between the measured value and the standard value, reducing the calibration error of the single-phase and three-phase energy standard meter, thereby improving the calibration accuracy of the single-phase and three-phase energy standard meter.

[0079] In one example, such as Figure 3 As shown, a pulse calibration method for single-phase and three-phase energy standard meters is provided, which is then applied to... Figure 1 Taking processor 102 as an example, the method includes the following steps:

[0080] Step S310: Obtain the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter; the total measurement pulse period is obtained by the tested energy standard meter processing the electrical measurement value according to the pulse conversion algorithm; the total standard pulse period is obtained by the reference energy standard meter processing the electrical standard value according to the pulse conversion algorithm.

[0081] For a detailed explanation of step S310, please refer to the description of the above embodiments, which will not be repeated here.

[0082] Step S320: Perform difference processing on the total period of the standard pulse and the total period of the measured pulse to obtain the first difference.

[0083] For example, the total period of the measurement pulse is obtained by processing the electrical measurement value using a pulse conversion algorithm on the tested electrical energy standard meter. The total period of the standard pulse is obtained by processing the electrical standard value using a pulse conversion algorithm on a reference electrical energy standard meter. The pulse conversion algorithm may include a first conversion formula and a second conversion formula. The first conversion formula is:

[0084]

[0085] Where D is the electrical measurement value or electrical standard value, C is the pulse constant, and Δt is one measurement pulse period or one standard pulse period.

[0086] The second conversion formula is:

[0087]

[0088] Where n is the number of pulses, Δt t For each measurement pulse cycle or each standard pulse cycle, T is the total measurement pulse cycle or the total standard pulse cycle.

[0089] It should be noted that the measured electrical value refers to the value obtained from the tested standard energy meter, while the standard electrical value refers to the value obtained by referring to the standard energy meter. The measurement pulse period refers to the period of one pulse output by the tested standard energy meter. The total standard pulse period refers to the period of one pulse output by the reference standard energy meter.

[0090] If the total period of the standard pulse is set to TR and the total period of the measured pulse is set to TL, the processor will perform difference processing on the total period of the standard pulse and the total period of the measured pulse to obtain the first difference, which is TR-TL.

[0091] Step S330: Using the first difference as the dividend, divide the first difference and the total period of the measurement pulse to obtain the error coefficient.

[0092] If the error coefficient is set to KT, the processor obtains the error coefficient by dividing the first difference by the total period of the measurement pulse, i.e., the error coefficient KT is:

[0093] Step S340: Calibrate the electrical parameters of the tested electrical energy standard meter according to the error coefficient.

[0094] For a detailed explanation of step S340 above, please refer to the description of the above embodiments, which will not be repeated here.

[0095] In the above embodiments, 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 changes in the measured value in real time. The error coefficient is obtained through processing and the electrical parameters of the tested energy standard meter are calibrated. The error coefficient avoids the influence of asynchronous measurement in traditional schemes, and more accurately reflects the measurement value error between the tested energy standard meter and the reference energy standard meter. In this way, it can accurately reflect the relationship between the measured value and the standard value, reduce the calibration error of the single-phase and three-phase energy standard meters, and thus improve the calibration accuracy of the single-phase and three-phase energy standard meters.

[0096] In one example, the electrical measurement value is the voltage measurement value; the electrical standard value is the voltage standard value.

[0097] The steps to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0098] The voltage error coefficient is obtained based on the total period of the voltage measurement pulse and the total period of the voltage standard pulse. The total period of the voltage measurement pulse is obtained by processing the voltage measurement value of the tested energy standard meter according to the pulse conversion algorithm. The total period of the voltage standard pulse is obtained by processing the voltage standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0099] The voltage measurement value refers to the voltage value measured by the tested energy standard meter; the voltage standard value refers to the voltage value measured by the reference energy standard meter. The tested energy standard meter processes the voltage measurement value using a pulse conversion algorithm to obtain the total voltage measurement pulse period; the reference energy standard meter processes the voltage standard value using a pulse conversion algorithm to obtain the total voltage standard pulse period. The processor acquires the total voltage measurement pulse period and the total voltage standard pulse period, and processes them to obtain the voltage error coefficient. This voltage error coefficient represents the voltage error between the voltage measurement values ​​of the tested energy standard meter and the reference energy standard meter.

[0100] Furthermore, the processor calibrates the measured voltage of the tested energy standard meter based on the obtained voltage error coefficient, thereby calibrating the measured voltage value of the tested energy standard meter. This accurately reflects the relationship between the measured voltage value and the voltage standard value, reduces the calibration error of the single-phase and three-phase energy standard meters, and thus improves the voltage calibration accuracy of the single-phase and three-phase energy standard meters.

[0101] In one example, the electrical measurement value is the current measurement value; the electrical standard value is the current standard value.

[0102] The steps to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0103] The current error coefficient is obtained based on the total period of the current measurement pulse and the total period of the current standard pulse. The total period of the current measurement pulse is obtained by processing the current measurement value of the tested energy standard meter according to the pulse conversion algorithm. The total period of the current standard pulse is obtained by processing the current standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0104] The measured current value refers to the current value obtained by the tested energy standard meter; the standard current value refers to the current value obtained by the reference energy standard meter. The tested energy standard meter processes the measured current value using a pulse conversion algorithm to obtain the total current measurement pulse period; the reference energy standard meter processes the standard current value using a pulse conversion algorithm to obtain the total standard current pulse period. The processor acquires the total current measurement pulse period and the total standard current pulse period, and processes them to obtain the current error coefficient. This current error coefficient represents the current error between the measured current values ​​of the tested and reference energy standard meters.

[0105] Furthermore, the processor calibrates the measured current of the tested energy standard meter based on the current error coefficient obtained from the processing, thereby calibrating the measured current value of the tested energy standard meter. This accurately reflects the relationship between the measured current value and the current standard value, reduces the calibration error of the single-phase and three-phase energy standard meters, and thus improves the current calibration accuracy of the single-phase and three-phase energy standard meters.

[0106] In one example, the electrical measurement value is the power measurement value; the electrical standard value is the power standard value.

[0107] The steps to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse include:

[0108] The power error coefficient is obtained based on 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 of the tested energy standard meter according to the pulse conversion algorithm. The total period of the power standard pulse is obtained by processing the power standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0109] The power measurement value refers to the power value measured by the tested energy standard meter; the power standard value refers to the power value measured by the reference energy standard meter. The tested energy standard meter processes the power measurement value using a pulse conversion algorithm to obtain the total power measurement pulse period; the reference energy standard meter processes the power standard value using a pulse conversion algorithm to obtain the total power standard pulse period. The processor acquires the total power measurement pulse period and the total power standard pulse period, and processes them to obtain the power error coefficient. This power error coefficient represents the power error between the power measurement values ​​of the tested energy standard meter and the reference energy standard meter.

[0110] Furthermore, the processor calibrates the measured power of the tested energy standard meter based on the power error coefficient obtained from the processing, thereby calibrating the measured power value of the tested energy standard meter. This accurately reflects the relationship between the measured power value and the power standard value, reduces the calibration error of the single-phase and three-phase energy standard meters, and thus improves the power calibration accuracy of the single-phase and three-phase energy standard meters.

[0111] In one embodiment, such as Figure 4 As shown, a pulse calibration method for single-phase and three-phase energy standard meters is provided, which is then applied to... Figure 1 Taking processor 102 as an example, the method includes the following steps:

[0112] Step S410: Based on the total period of the power measurement pulse and the total period of the power standard pulse, the power error coefficient is obtained; the total period of the power measurement pulse is obtained by processing the power measurement value of the tested energy standard meter according to the pulse conversion algorithm; the total period of the power standard pulse is obtained by processing the power standard value of the reference energy standard meter according to the pulse conversion algorithm.

[0113] For a detailed explanation of step S410, please refer to the description of the above embodiments, which will not be repeated here.

[0114] Step S420: Based on the power phase angle conversion algorithm, the power error coefficient, power measurement value and power standard value are processed to obtain the phase angle difference.

[0115] For example, the power phase angle conversion algorithm is as follows:

[0116]

[0117] Where, θ R The phase angle is measured with reference to the standard power meter. KP is the power error coefficient, and Δθ is the phase angle difference.

[0118] In one example, let the total period of the power standard pulse be PR, the total period of the power measurement pulse be PL, and the power error coefficient be KP. Then, from P = U × I × cosθ, we can know... Where, θ R θ is the phase angle measured with reference to the standard electricity meter. L The phase angle measured for the electrical energy standard meter under test.

[0119] Power was calibrated under 0.5L conditions. θ R and θ L Let the difference be denoted as Δθ, then we have Expanded by the Taylor series of the cosine function cos. Take the first 5 terms of the series, and... After expansion, Newton's iteration method is used to calculate Δθ. Then Δθ is the phase angle difference.

[0120] Step S430: Based on the phase angle difference, calibrate the phase angle parameters of the tested energy standard meter.

[0121] The processor calibrates the phase angle parameters of the tested energy standard meter based on the obtained phase angle difference, thereby calibrating the measured values ​​of the corresponding phase angle parameters of the tested energy standard meter.

[0122] In the above embodiments, the phase angle parameters of the tested energy standard meter are 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 error between the tested energy standard meter and the reference energy standard meter. In this way, it can accurately reflect the relationship between the phase angle measurement value and the standard value, reduce the phase angle calibration error of the single-phase and three-phase energy standard meters, and thus improve the phase angle calibration accuracy of the single-phase and three-phase energy standard meters.

[0123] It should be understood that, although Figure 2-4 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2-4 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0124] In one embodiment, such as Figure 5 As shown, a pulse calibration device for a single-phase or three-phase energy standard meter is provided. The pulse calibration device for the single-phase or three-phase energy standard meter includes:

[0125] The pulse period acquisition unit 510 is used to acquire the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter; the total measurement pulse period is obtained by the tested energy standard meter processing the electrical measurement value according to the pulse conversion algorithm; the total standard pulse period is obtained by the reference energy standard meter processing the electrical standard value according to the pulse conversion algorithm.

[0126] The error coefficient processing unit 520 is used to obtain the error coefficient based on the total period of the measured pulse and the total period of the standard pulse.

[0127] The calibration unit 530 is used to calibrate the electrical parameters of the tested energy standard meter according to the error coefficient.

[0128] Specific limitations regarding the pulse calibration device for single-phase and three-phase energy standard meters can be found in the limitations of the pulse calibration method for single-phase and three-phase energy standard meters mentioned above, and will not be repeated here. Each module in the aforementioned pulse calibration device for single-phase and three-phase energy standard meters can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware or independent of the error verification module in the pulse calibration system of the single-phase and three-phase energy standard meters, or they can be stored in software within the memory of the pulse calibration system of the single-phase and three-phase energy standard meters, so that the error verification module can call and execute the corresponding operations of each module.

[0129] In one embodiment, such as Figure 6 As shown, a pulse calibration system for single-phase and three-phase energy standard meters is also provided. The system includes several energy standard meters 610 under test, an error verification module 620, a reference energy standard meter 630, and a three-phase standard power source 640. The three-phase standard power source 640 is connected to the reference energy standard meter 630 and each energy standard meter 610 under test. The error verification module 620 is connected to the reference energy standard meter 630 and each energy standard meter 610 under test. The error verification module 620 is used to perform the steps of any of the pulse calibration methods for single-phase and three-phase energy standard meters described above.

[0130] The tested energy standard meter 610 can be a single-phase or three-phase multi-functional energy standard meter, and the reference energy standard meter 630 can be a three-phase energy standard meter of model LeiDian RX33. The error verification module 620 can include multiple error verification units. The pulse output terminal of each tested energy standard meter 610 is connected to the tested pulse input terminal of the error verification unit. The standard pulse output terminal of the reference energy standard meter 630 is connected to the standard pulse input terminal of the error verification unit. Each error verification unit is connected one-to-one with the pulse port of each tested energy standard meter 610. Each tested energy standard meter 610 includes a standard pulse TTL signal output terminal, and the error verification unit includes a tested pulse input terminal and a standard pulse input terminal. The standard pulse output terminal of the reference energy standard meter 630 is connected to the standard pulse input terminals of multiple error verification units. Each tested energy standard meter 610 corresponds to one error verification unit.

[0131] For example, the error verification module 620 can be used to perform the following steps of a pulse calibration method for a single-phase or three-phase energy standard meter: obtaining the total measurement pulse period of the energy standard meter under test 610 and the total standard pulse period of the reference energy standard meter 630; the total measurement pulse period is obtained by processing the electrical measurement value of the energy standard meter under test 610 according to a pulse conversion algorithm; the total standard pulse period is obtained by processing the electrical standard value of the reference energy standard meter 630 according to a pulse conversion algorithm. An error coefficient is obtained based on the total measurement pulse period and the total standard pulse period. The electrical parameters of the energy standard meter under test 610 are calibrated based on the error coefficient.

[0132] Specifically, the total period of the measurement pulse is obtained by processing the energy standard meter under test 610, and the total period of the standard pulse is obtained by processing the reference energy standard meter 630. The total period of the measurement pulse and the total period of the standard pulse are synchronously reflected in real time to reflect the change of the measured value. The error coefficient obtained by the error verification module 620 is used to calibrate the electrical parameters of the energy standard meter under test. The error coefficient avoids the influence of asynchronous measurement in the traditional scheme, and more accurately reflects the measurement value error of the energy standard meter under test and the reference energy standard meter. In this way, it can accurately reflect the relationship between the measured value and the standard value, reduce the calibration error of the single-phase and three-phase energy standard meters, and thus improve the calibration accuracy of the single-phase and three-phase energy standard meters.

[0133] In one embodiment, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the pulse calibration method for any of the above-described single- or three-phase energy standard meters.

[0134] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the division operations described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may 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), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0135] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0136] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pulse calibration method for a single-phase or three-phase power standard meter, characterized in that, Includes the following steps: Obtain the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter; The total period of the measurement pulse is obtained by processing the electrical measurement value of the tested electrical energy standard meter according to the pulse conversion algorithm. The total period of the standard pulse is obtained by processing the electrical standard value using the pulse conversion algorithm of the reference electrical energy standard meter. The error coefficient is obtained based on the total period of the measured pulse and the total period of the standard pulse; The electrical parameters of the tested electrical energy standard meter are calibrated according to the error coefficient. The step of obtaining the error coefficient based on the total period of the measured pulse and the total period of the standard pulse includes: The difference between the total period of the standard pulse and the total period of the measured pulse is processed to obtain a first difference; Using the first difference as the dividend, the first difference and the total period of the measurement pulse are divided to obtain the error coefficient; The pulse conversion algorithm includes a first conversion formula and a second conversion formula; The first conversion formula is: in, These are electrical measurement values ​​or electrical standard values. Where is the pulse constant. For one measurement pulse cycle or one standard pulse cycle; The second conversion formula is: in, The number of pulses. For each measurement pulse cycle or each standard pulse cycle, To measure the total pulse period or the standard pulse period.

2. The pulse calibration method for single-phase and three-phase power standard meters according to claim 1, characterized in that, The electrical measurement value is the voltage measurement value; The electrical standard value is the voltage standard value; The step of obtaining the error coefficient based on the total period of the measured pulse and the total period of the standard pulse includes: The voltage error coefficient is obtained based on the total period of the voltage measurement pulse and the total period of the voltage standard pulse; The total period of the voltage measurement pulse is obtained by processing the voltage measurement value using the pulse conversion algorithm of the tested energy standard meter; the total period of the voltage standard pulse is obtained by processing the voltage standard value using the pulse conversion algorithm of the reference energy standard meter.

3. The pulse calibration method for single-phase and three-phase power standard meters according to claim 1, characterized in that, The electrical measurement value is the current measurement value; The electrical standard value is the current standard value; The step of obtaining the error coefficient based on the total period of the measured pulse and the total period of the standard pulse includes: The current error coefficient is obtained based on the total period of the current measurement pulse and the total period of the current standard pulse; the total period of the current measurement pulse is obtained by the tested energy standard meter processing the current measurement value according to the pulse conversion algorithm; the total period of the current standard pulse is obtained by the reference energy standard meter processing the current standard value according to the pulse conversion algorithm.

4. The pulse calibration method for single-phase and three-phase power standard meters according to claim 1, characterized in that, The electrical measurement value is the power measurement value; The electrical standard value is the power standard value; The step of obtaining the error coefficient based on the total period of the measured pulse and the total period of the standard pulse includes: The power error coefficient is obtained based on 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 of the tested energy standard meter according to the pulse conversion algorithm; the total period of the power standard pulse is obtained by processing the power standard value of the reference energy standard meter according to the pulse conversion algorithm.

5. The pulse calibration method for single-phase and three-phase power standard meters according to claim 4, characterized in that, The step of obtaining the power error coefficient based on the total period of the power measurement pulse and the total period of the power standard pulse includes: Based on the power phase angle conversion algorithm, the power error coefficient, the power measurement value, and the power standard value are processed to obtain the phase angle difference; The step of calibrating the electrical parameters of the tested energy standard meter according to the error coefficient includes: The phase angle parameters of the tested electrical energy standard meter are calibrated based on the phase angle difference.

6. The pulse calibration method for single-phase and three-phase power standard meters according to claim 5, characterized in that, The power phase angle conversion algorithm is as follows: in, The phase angle is measured with reference to the standard electricity meter. The power error coefficient is... The phase angle difference is the value mentioned above.

7. A pulse calibration device for a single-phase or three-phase power standard meter, characterized in that, include: The pulse period acquisition unit is used to acquire the total measurement pulse period of the tested energy standard meter and the total standard pulse period of the reference energy standard meter. The total period of the measurement pulse is obtained by processing the electrical measurement value of the tested electrical energy standard meter according to the pulse conversion algorithm. The total period of the standard pulse is obtained by processing the electrical standard value using the pulse conversion algorithm of the reference electrical energy standard meter. An error coefficient processing unit is used to obtain an error coefficient based on the total period of the measurement pulse and the total period of the standard pulse; The step of obtaining the error coefficient based on the total period of the measured pulse and the total period of the standard pulse includes: The difference between the total period of the standard pulse and the total period of the measured pulse is processed to obtain a first difference; Using the first difference as the dividend, the first difference and the total period of the measurement pulse are divided to obtain the error coefficient; A calibration unit is used to calibrate the electrical parameters of the tested energy standard meter according to the error coefficient. The pulse conversion algorithm includes a first conversion formula and a second conversion formula; The first conversion formula is: in, These are electrical measurement values ​​or electrical standard values. Where is the pulse constant. For one measurement pulse cycle or one standard pulse cycle; The second conversion formula is: in, The number of pulses. For each measurement pulse cycle or each standard pulse cycle, To measure the total pulse period or the standard pulse period.

8. A pulse calibration system for a single-phase or three-phase power standard meter, characterized in that, This includes several energy standard meters under test, an error verification module, a reference energy standard meter, and a three-phase standard power source; The three-phase standard power source is connected to the reference energy standard meter and each of the tested energy standard meters respectively; the error verification module is connected to the reference energy standard meter and each of the tested energy standard meters respectively. The error verification module is used to perform the steps of the pulse calibration method for the single-phase or three-phase power standard meter according to any one of claims 1 to 6.

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