Tracing circuit, equivalent apparent power value obtaining method and device and computer equipment

Abstract

The invention relates to a traceability circuit, an equivalent apparent power value obtaining method and device and computer equipment. The method comprises the following steps: acquiring a measurement condition of a traceability circuit, operating the traceability circuit according to the measurement condition, acquiring a circuit parameter measurement value of the traceability circuit under the condition that the operation time length of the traceability circuit reaches a preset time length, acquiring a reference equivalent apparent power value according to the circuit parameter measurement value, and determining the traceability circuit according to the reference equivalent apparent power value. And performing uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement value, and obtaining a target equivalent apparent power value according to an uncertainty evaluation result. By adopting the method, the traceability of the equivalent apparent power quantity value can be realized, so that the measurement accuracy of the equivalent apparent power is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a traceability circuit, a method and device for obtaining an equivalent apparent power value, and a computer device. Background Art

[0002] With the large-scale integration of renewable energy and power electronic devices into the power grid, power load characteristics have changed significantly, exhibiting complex characteristics such as increased reactive energy, load imbalance, rising harmonic content, and increased voltage fluctuations. These "unintended" power components (such as reactive power, unbalanced power, and harmonics) lead to increased transmission line losses, reduced grid energy transmission efficiency, and create challenges in measuring apparent power.

[0003] Currently, a unified standard has been established for measuring single-phase apparent power. However, there are three generally accepted definitions of apparent power in three-phase circuits (arithmetic, vector, and equivalent), and their measurement formulas have not yet been unified. Significant differences in apparent power and power factor under these different definitions can lead to inaccurate metering results, thus impacting the incentives for power quality management. The definition of equivalent apparent power is more reasonable than the other two definitions, as it can more accurately assess the energy transfer efficiency of transmission lines under non-sinusoidal and unbalanced conditions. However, there is currently no physical standard or traceability method for equivalent apparent power, resulting in a lack of unified evaluation criteria for measurement results from various meters. Therefore, a method for accurately obtaining equivalent apparent power values ​​is urgently needed. Summary of the Invention

[0004] Based on this, it is necessary to provide a traceability circuit, an equivalent apparent power value acquisition method, an apparatus and a computer device that can improve the accuracy of the equivalent apparent power to address the above technical problems.

[0005] In a first aspect, the present application provides a traceability circuit, comprising:

[0006] Power module;

[0007] The resistance module is connected to the power module and includes at least one standard resistor, and the number of the standard resistors is the same as the number of wirings of the power module;

[0008] a measuring module connected to the power module and used to measure circuit parameters, the circuit parameters including a first active electric energy output by the power supply side, a second active electric energy received by the load side, equivalent apparent power, and equivalent voltage;

[0009] Load module, connected to the power module.

[0010] In one embodiment, the measurement module includes:

[0011] A first electric energy measuring unit is connected in series with the power module and is used to measure a first active electric energy output by the power module;

[0012] a second electric energy measuring unit, connected in series with the load module, and configured to measure a second active electric energy received by the load module;

[0013] The apparent power measurement unit is connected in series with the power module to measure the equivalent apparent power of the traceability circuit;

[0014] The equivalent voltage measuring unit is connected in parallel to the branch where the apparent power measuring unit is located, and is used to measure the equivalent voltage of the branch.

[0015] In one embodiment, the power module is a single-phase power supply; the resistance module includes a standard resistor, which is connected in series between the first electric energy measurement unit and the second electric energy measurement unit; and the measurement module is connected in series to the single-phase line of the power module.

[0016] In one embodiment, the power module is a three-phase three-wire power supply, and the measuring module is connected to each phase line of the power module through a corresponding terminal.

[0017] In one embodiment, the power module is a three-phase four-wire power supply, and the measurement module is further connected to the neutral phase line of the power module through a neutral line terminal.

[0018] In a second aspect, the present application provides a method for obtaining an equivalent apparent power value, comprising:

[0019] Obtain measurement conditions of the traceability circuit and run the traceability circuit according to the measurement conditions, which include voltage conditions, resistance conditions, and current conditions;

[0020] When the operation time of the traceability circuit reaches a preset time, obtaining circuit parameter measurement values ​​of the traceability circuit, the circuit parameter measurement values ​​including a first active electric energy output by the power supply side, a second active electric energy received by the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value;

[0021] Obtain reference equivalent apparent power values ​​based on circuit parameter measurement values;

[0022] The uncertainty of the reference equivalent apparent power value is evaluated according to the measured values ​​of the circuit parameters, and the target equivalent apparent power value is obtained according to the uncertainty evaluation result.

[0023] In one embodiment, the circuit parameter measurement value further includes a standard resistance value and an operating time of the traceability circuit; and the step of obtaining a reference equivalent apparent power value based on the circuit parameter measurement value includes:

[0024] The product of the equivalent voltage measurement value and the square root of the target fraction is used as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electric energy and the second active electric energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0025] In one embodiment, the step of performing uncertainty assessment on a reference equivalent apparent power value based on a circuit parameter measurement value includes:

[0026] Obtain the uncertainty results and corresponding sensitivity coefficients corresponding to the measured values ​​of each circuit parameter respectively. The sensitivity coefficient is used to characterize the degree of influence of the measured value of the circuit parameter on the reference equivalent apparent power value.

[0027] Based on all uncertainty results and corresponding sensitivity coefficients, the combined standard uncertainty of the reference equivalent apparent power value is obtained.

[0028] In a third aspect, the present application further provides a device for obtaining an equivalent apparent power value, comprising:

[0029] The circuit operation module is used to obtain the measurement conditions of the traceability circuit and operate the traceability circuit according to the measurement conditions, which include voltage conditions, resistance conditions, and current conditions;

[0030] A measurement value acquisition module is used to obtain circuit parameter measurement values ​​of the traceability circuit when the operation time of the traceability circuit reaches a preset time, the circuit parameter measurement values ​​including the first active electric energy output by the power supply side, the second active electric energy received by the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value;

[0031] A reference value acquisition module is used to obtain a reference equivalent apparent power value based on the circuit parameter measurement value;

[0032] The target value acquisition module is used to perform uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement value, and obtain the target equivalent apparent power value according to the uncertainty evaluation result.

[0033] In a fourth aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements any one of the method steps in the second aspect when executing the computer program.

[0034] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements any one of the method steps in the second aspect when the computer program is executed by a processor.

[0035] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which implements the method steps of any one of the second aspects when executed by a processor.

[0036] The above-mentioned traceability circuit, equivalent apparent power value acquisition method, device and computer equipment obtain the measurement conditions of the traceability circuit, operate the traceability circuit according to the measurement conditions, obtain the circuit parameter measurement value of the traceability circuit when the operating time of the traceability circuit reaches a preset time, obtain the reference equivalent apparent power value based on the circuit parameter measurement value, perform uncertainty evaluation on the reference equivalent apparent power value based on the circuit parameter measurement value, and obtain the target equivalent apparent power value based on the uncertainty evaluation result. It can quantify the reliability of the measurement result, clarify the deviation range between the measurement value and the true value, realize traceability to a higher measurement standard, and ensure the accuracy of the measured equivalent apparent power value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 Schematic diagram of a traceability circuit in one embodiment;

[0039] Figure 2 Schematic diagram of a tracing circuit for single-phase equivalent apparent power in one embodiment;

[0040] Figure 3 Schematic diagram of a tracing circuit for three-phase three-wire equivalent apparent power in one embodiment;

[0041] Figure 4 A schematic diagram of a tracing circuit for three-phase four-wire equivalent apparent power in one embodiment;

[0042] Figure 5 1 is a flow chart of a method for obtaining an equivalent apparent power value in one embodiment;

[0043] Figure 6 2 is a flow chart of a method for obtaining an equivalent apparent power value according to another embodiment;

[0044] Figure 7 is a structural block diagram of a device for obtaining an equivalent apparent power value in one embodiment;

[0045] Figure 8 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0047] With the widespread access of a large number of new energy sources and power electronic devices to the power grid, power load conditions are becoming increasingly complex, characterized by increased reactive energy, unbalanced loads, increased harmonic content, and intensified voltage fluctuations. These "unintended" power components, such as reactive power, unbalanced loads, and harmonics, inevitably increase energy losses in transmission lines, reducing the grid's energy transmission efficiency. This also poses new challenges to the accurate measurement of apparent power. Currently, there is no unified formula for measuring apparent power in three-phase circuits, making it difficult to trace the apparent power value.

[0048] Based on this, the embodiments of the present application provide a traceability circuit for equivalent apparent power values ​​and a method for obtaining equivalent apparent power values, which can trace the equivalent apparent power measurement value to be traced back to a standard measurement reference to improve the accuracy of the equivalent apparent power value, maximize the utilization of transmission lines, and reduce transmission energy losses.

[0049] In an exemplary embodiment, a traceability circuit is provided for achieving accurate measurement of physical quantities and traceability of measurement values, wherein traceability of measurement values ​​is a property of enabling the value of a measurement result or measurement standard to be linked to a specified reference standard through an uninterrupted comparison chain with a specified uncertainty.

[0050] Specifically, the traceability circuit is established based on two measurement models, where the first measurement model is established using the energy conservation theorem, that is, the loss ΔW of the transmission line 损 Should be equal to the active electrical energy W output from the power supply side 源 The active electrical energy W received by the load side 荷 The difference in the measurement results, where the line loss active power is linearly superimposed in the time domain, results in the following measurement formula:

[0051]

[0052] Among them, the measurement model 2 assumes the line impedance parameter R s Constant, by giving the load side equivalent apparent power S and equivalent voltage V within the measurement time T e The measurement results can also realize the measurement of line loss, and the measurement formula is as follows:

[0053]

[0054] In the above formula, R s is the standard resistor value, S is the equivalent apparent power value, Ve is the equivalent voltage, and T is the measurement time.

[0055] According to the above formula, we have:

[0056]

[0057] Based on this, the error model is expressed as:

[0058]

[0059] Where S is the measured value of the equivalent apparent power meter to be traced, assuming the latter is the ideal value S r , and S r As the standard measurement result, ΔS is the instrument measurement deviation.

[0060] In summary, the ΔS calculated using the error model can intuitively reflect the measurement deviation of the equivalent apparent power meter being traced. Once the deviation is determined, the meter's accuracy can be determined. If the deviation exceeds the allowable range, calibration or adjustment is required to bring the meter's measured value closer to the true value. This allows traceability of the measured value to the metrological standard, ensuring the accuracy and reliability of the measurement results.

[0061] In an exemplary embodiment, Figure 1 As shown, the traceability circuit provided in the embodiment of the present application includes: a power module 100, a resistance module 200, a measurement module 300 and a load module 400. Among them, the resistance module 200 is connected to the power module 100 and includes at least one standard resistor. The number of standard resistors is the same as the number of wirings of the power module 100. The measurement module 300 is connected to the power module 100 and is used to measure circuit parameters. The circuit parameters include the first active electrical energy output by the power supply side, the second active electrical energy received by the load side, the equivalent apparent power and the equivalent voltage. The load module 400 is connected to the power module 100.

[0062] In an exemplary embodiment, Figure 1 As shown, the measurement module 300 includes: a first electric energy measurement unit 301, a second electric energy measurement unit 302, an apparent power measurement unit 303 and an equivalent voltage measurement unit 304. The first electric energy measurement unit 301 is connected in series with the power module 100 to measure the first active electric energy output by the power module 100. The second electric energy measurement unit 302 is connected in series with the load module 400 to measure the second active electric energy received by the load module 400. The apparent power measurement unit 303 is connected in series with the power module 100 to measure the equivalent apparent power of the traceability circuit. The equivalent voltage measurement unit 304 is connected in parallel to the branch where the apparent power measurement unit 303 is located to measure the equivalent voltage of the branch.

[0063] In this embodiment, the measurement module measures the first active electric energy output by the power supply side, the second active electric energy received by the load side, the equivalent apparent power and the equivalent voltage, so as to accurately obtain the ideal equivalent apparent power value, thereby improving the accuracy of the traceability process.

[0064] In an exemplary embodiment, Figure 2 As shown, Figure 2 This is a schematic diagram of a single-phase equivalent apparent power tracing circuit shown in an embodiment of the present application. Figure 2 In the example, the power module 100 is a single-phase power supply, and the resistance module 200 includes a standard resistor R s , standard resistor R s The measuring module 300 is connected in series between the first electric energy measuring unit 301 and the second electric energy measuring unit 302, and is connected in series to the single-phase line of the power supply module 100. The first electric energy measuring unit 301 is a high-precision electric energy meter used to measure the first active electric energy W output by the power supply side. 源 The second electric energy measurement unit 302 is also a high-precision electric energy meter, which is used to measure the second active electric energy W received by the load side. 荷 The apparent power measurement unit 303 is a traceable apparent power meter, used to measure the equivalent apparent power S. The equivalent voltage measurement unit 304 includes a custom voltmeter, used to measure the equivalent voltage V e .

[0065] Similar, such as Figure 3 Shown and Figure 4 As shown, Figure 3 This is a schematic diagram of a three-phase three-wire equivalent apparent power tracing circuit shown in an embodiment of the present application. Figure 4 This is a schematic diagram of a three-phase four-wire equivalent apparent power tracing circuit shown in an embodiment of the present application. Figure 3 In the example, the power module 100 is a three-phase three-wire power supply, and the measurement module 300 is connected to each phase line of the power module 100 through the corresponding terminal, and each phase voltage terminal and current input terminal are short-circuited. Figure 3 Here, the three-phase three-wire instrument is connected in direct access mode, that is, each phase voltage terminal and current input terminal are short-circuited. Figure 4 In the embodiment, the power module 100 is a three-phase four-wire power supply, and the measuring module 300 is further connected to the neutral phase line of the power module 100 through the neutral line terminal.

[0066] In this embodiment, since the measurement values ​​of the high-precision electric energy meter and the customized voltmeter can be traced back to the corresponding measurement standards, the traceability circuit can be used to trace the measurement results of the equivalent apparent power meter to be traced, thereby improving the accuracy of the equivalent apparent power.

[0067] In an exemplary embodiment, Figure 5As shown in FIG, a method for obtaining an equivalent apparent power value is provided, and the method is applied to Figure 1 The traceability circuit shown in FIG. 1 is used as an example for description, and includes the following steps 502 to 508. In which:

[0068] S502: Acquire measurement conditions of the traceability circuit, and run the traceability circuit according to the measurement conditions, where the measurement conditions include voltage conditions, resistance conditions, and current conditions.

[0069] Optionally, the voltage condition within the measurement conditions is set by the power module, which can be adjusted to output a suitable voltage. The resistance condition involves standard resistors in the resistance module, whose values ​​are precise and the quantity is adapted to the power module wiring, providing a stable resistance reference for the circuit. The current condition can be adjusted through the power module and load module. After obtaining these conditions, the traceability circuit is run to ensure that the circuit operates under the preset operating conditions. The appropriate measurement conditions can avoid measurement errors caused by abnormal voltage, resistance, and current, ensuring measurement accuracy and stability.

[0070] S504: When the running time of the traceability circuit reaches a preset time, the circuit parameter measurement value of the traceability circuit is obtained, and the circuit parameter measurement value includes the first active electric energy output by the power supply side, the second active electric energy received by the load side, the equivalent apparent power measurement value and the equivalent voltage measurement value.

[0071] Optionally, when the traceability circuit runs for a preset duration, the circuit parameters are measured through a measurement module. The portion connected in series with the power module measures a first active electrical energy output on the power supply side, the portion connected in series with the load module measures a second active electrical energy received on the load side, the apparent power measurement unit connected in series with the power module measures an equivalent apparent power measurement value, and the equivalent voltage measurement unit connected in parallel with the corresponding branch measures an equivalent voltage measurement value. After running for the preset duration, the circuit reaches a stable state. The measurement values ​​obtained at this time better reflect the actual operating conditions and reduce the interference of transient processes on the measurement.

[0072] S506: Obtain a reference equivalent apparent power value according to the circuit parameter measurement value.

[0073] Optionally, a reference equivalent apparent power value is obtained based on the acquired first active energy output by the power source, the second active energy received by the load, the equivalent apparent power measurement value, and the equivalent voltage measurement value. The reference equivalent apparent power value is a benchmark quantity used to evaluate the accuracy of the power meter to be traced. Calculating the reference equivalent apparent power value based on accurate measurement parameters provides an important reference for subsequent uncertainty assessment and traceability calibration.

[0074] S508: Evaluate the uncertainty of the reference equivalent apparent power value according to the measured values ​​of the circuit parameters, and obtain the target equivalent apparent power value according to the uncertainty evaluation result.

[0075] Optionally, when performing uncertainty assessment, based on the measured values ​​of the circuit parameters, the uncertainty of each parameter (such as the accuracy of the measuring equipment, the influence of environmental factors, etc.) is considered, the influence of the uncertainty of each parameter on the reference equivalent apparent power value is analyzed, and the synthetic uncertainty is calculated by the uncertainty propagation law. Then, based on the assessment results, the reference equivalent apparent power value is corrected or processed to obtain the target equivalent apparent power value.

[0076] In the above-mentioned method for obtaining the equivalent apparent power value, the measurement conditions of the traceability circuit are obtained, the traceability circuit is operated according to the measurement conditions, and when the operating time of the traceability circuit reaches a preset time, the circuit parameter measurement value of the traceability circuit is obtained. Based on the circuit parameter measurement value, the reference equivalent apparent power value is obtained, and the uncertainty of the reference equivalent apparent power value is evaluated based on the circuit parameter measurement value. Based on the uncertainty evaluation result, the target equivalent apparent power value is obtained. This can quantify the reliability of the measurement result, clarify the deviation range between the measurement value and the true value, achieve traceability to a higher measurement standard, and ensure the accuracy of the measured equivalent apparent power value.

[0077] In an exemplary embodiment, the circuit parameter measurement value also includes a standard resistance value and the operating time of the traceability circuit; the step of obtaining a reference equivalent apparent power value based on the circuit parameter measurement value includes: taking the product of the equivalent voltage measurement value and the square root of the target fraction as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electrical energy and the second active electrical energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0078] For example, the reference equivalent apparent power value S r The calculation formula is:

[0079]

[0080] Among them, V e is the equivalent voltage measurement value, W 源 is the first active electrical energy, W 荷 is the second active electrical energy received by the load side, R s is the standard resistance value, and T is the operating time.

[0081] In this embodiment, obtaining a reference equivalent apparent power value based on the circuit parameter measurement value can ensure the accuracy of the reference equivalent apparent power value, provide accurate data support for subsequent uncertainty evaluation, and thus improve the accuracy of the equivalent apparent power value.

[0082] In an exemplary embodiment, the step of performing uncertainty evaluation on a reference equivalent apparent power value based on circuit parameter measurement values ​​includes: obtaining the uncertainty results and corresponding sensitivity coefficients corresponding to each circuit parameter measurement value, respectively, where the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value; and obtaining the composite standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and corresponding sensitivity coefficients.

[0083] Optionally, the first active energy output from the power supply side is measured by the first energy measurement unit in the measurement module. Its uncertainty primarily stems from the accuracy of the energy measurement unit itself (such as the inherent error and resolution limitation of the meter) and environmental factors (such as the effects of temperature and electromagnetic interference on measurement). Its Type B standard uncertainty is determined based on the meter's specifications or calibration certificate. The second active energy received by the load side is measured by the second energy measurement unit. Its uncertainty stems from similar factors as the first active energy, including measurement unit accuracy and environmental factors. The Type B uncertainty can also be obtained from the specifications. The equivalent voltage measurement value is obtained by the equivalent voltage measurement unit. Its uncertainty stems from factors such as voltmeter accuracy and line voltage stability. Furthermore, when obtaining the reference equivalent apparent power value, the influence of the resistance value and operating time of the standard resistor must be considered. The purpose of the standard resistor is to output a stable resistance. To minimize the effects of connecting line impedance and improve measurement resolution, the resistance value can be relatively large. Its Type B standard uncertainty is calculated based on the data in the calibration certificate or specification. It is important to note that during physical testing, Rs must reach thermal stability. The running time can be measured by a standard time base source, and its Type B standard uncertainty can be calculated according to the data in the verification certificate.

[0084] Furthermore, the sensitivity coefficient reflects the degree of influence of each circuit parameter's measured value on the reference equivalent apparent power value. It is derived mathematically based on the relationship between each parameter and power in the traceable circuit. After obtaining the uncertainty results and sensitivity coefficients for each circuit parameter, the combined standard uncertainty is calculated using the uncertainty propagation law. The combined standard uncertainty characterizes the reliability of the reference equivalent apparent power value. Based on this reliable reference equivalent apparent power value, the measurement results of the traceable equivalent apparent power meter are traced back to the source, ensuring that the measurement results of the traceable equivalent apparent power meter are closer to the true value.

[0085] For example, the uncertainty evaluation based on the Guide to the Expression of Uncertainty in Measurement (GUM) is used to illustrate the uncertainty propagation law. The reference equivalent apparent power value S is calculated. r The combined standard uncertainty of , and its combined variance can be written as:

[0086]

[0087] in, is the composite variance, is the uncertainty of the first active electrical energy, is the uncertainty of the second active electrical energy, is the uncertainty of the equivalent voltage, is the uncertainty of the resistance value, is the uncertainty of the runtime.

[0088] Among them, the sensitivity coefficients of each item are:

[0089]

[0090]

[0091]

[0092]

[0093]

[0094] In summary, since the measurement module is calibrated with the corresponding measurement standard, the reference equivalent apparent power value obtained by the traceability circuit is traceable. By comparing the measured value S of the equivalent apparent power meter to be traced with the reference equivalent apparent power value S r Compare and obtain the reference equivalent apparent power value S r The uncertainty result is used to characterize the reference equivalent apparent power value S r The reliability of S r The higher the reliability, the greater the value of S can be obtained through the reliable S r Indirect traceability to the corresponding measurement standard.

[0095] Optionally, when higher-precision traceability requirements are required, the standard resistance value and the operating time may be adjusted, for example, by selecting a standard resistor with a higher nominal value or extending the operating time to reduce the impact of short-term noise or drift on the results.

[0096] In this embodiment, by respectively obtaining the uncertainty results and corresponding sensitivity coefficients corresponding to the measurement values ​​of each circuit parameter, and obtaining the synthetic standard uncertainty of the reference equivalent apparent power value based on all the uncertainty results and the corresponding sensitivity coefficients, the reliability of the measurement results can be quantified, the deviation range between the measured value and the true value can be clarified, and traceability to higher measurement standards can be achieved, thereby ensuring the accuracy of the measured equivalent apparent power value.

[0097] In an exemplary embodiment, Figure 6 As shown, a method for obtaining an equivalent apparent power value is provided, and the method includes the following steps:

[0098] S602: Acquire measurement conditions of the traceability circuit and run the traceability circuit according to the measurement conditions, where the measurement conditions include voltage conditions, resistance conditions, and current conditions.

[0099] S604: When the running time of the traceability circuit reaches a preset time, the circuit parameter measurement value of the traceability circuit is obtained, and the circuit parameter measurement value includes the first active electric energy output by the power supply side, the second active electric energy received by the load side, the equivalent apparent power measurement value and the equivalent voltage measurement value.

[0100] S606: The product of the equivalent voltage measurement value and the square root of the target fraction is used as the reference equivalent apparent power value, where the numerator of the target fraction is the difference between the first active electric energy and the second active electric energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0101] S608: Obtain the uncertainty results and corresponding sensitivity coefficients corresponding to the measured values ​​of each circuit parameter respectively. The sensitivity coefficient is used to characterize the degree of influence of the measured values ​​of the circuit parameters on the reference equivalent apparent power value; based on all the uncertainty results and the corresponding sensitivity coefficients, obtain the combined standard uncertainty of the reference equivalent apparent power value.

[0102] S610: Obtain a target equivalent apparent power value according to the uncertainty evaluation result.

[0103] In this embodiment, by obtaining the measurement conditions of the traceability circuit, running the traceability circuit according to the measurement conditions, and obtaining the circuit parameter measurement values ​​of the traceability circuit when the running time of the traceability circuit reaches a preset time, obtaining the reference equivalent apparent power value based on the circuit parameter measurement values, performing uncertainty evaluation on the reference equivalent apparent power value based on the circuit parameter measurement values, and obtaining the target equivalent apparent power value based on the uncertainty evaluation results, the reliability of the measurement results can be quantified, the deviation range between the measurement value and the true value can be clarified, traceability to a higher measurement standard can be achieved, and the accuracy of the measured equivalent apparent power value can be ensured.

[0104] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0105] Based on the same inventive concept, embodiments of the present application further provide an equivalent apparent power value acquisition device for implementing the above-mentioned method for acquiring equivalent apparent power values. The solution provided by this device is similar to the solution described in the above-mentioned method. Therefore, the specific limitations in one or more embodiments of the equivalent apparent power value acquisition device provided below can be found in the above-mentioned limitations of the method for acquiring equivalent apparent power values, and will not be repeated here.

[0106] In an exemplary embodiment, Figure 7 As shown, an equivalent apparent power value acquisition device is provided, including: a circuit operation module 702, a measurement value acquisition module 704, a reference value acquisition module 706 and a target value acquisition module 708, wherein:

[0107] The circuit operation module 702 is used to obtain measurement conditions of the traceability circuit and operate the traceability circuit according to the measurement conditions, which include voltage conditions, resistance conditions, and current conditions.

[0108] The measurement value acquisition module 704 is used to obtain the circuit parameter measurement value of the traceability circuit when the operating time of the traceability circuit reaches a preset time. The circuit parameter measurement value includes the first active electric energy output by the power supply side, the second active electric energy received by the load side, the equivalent apparent power measurement value and the equivalent voltage measurement value.

[0109] The reference value acquisition module 706 is configured to acquire a reference equivalent apparent power value according to the circuit parameter measurement value.

[0110] The target value acquisition module 708 is configured to perform uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement value, and acquire the target equivalent apparent power value according to the uncertainty evaluation result.

[0111] In an exemplary embodiment, the circuit parameter measurement value also includes a standard resistance value and the operating time of the traceability circuit; the reference value acquisition module 706 is also used to use the product of the equivalent voltage measurement value and the square root of the target fraction as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electrical energy and the second active electrical energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0112] In an exemplary embodiment, the target value acquisition module 708 is also used to respectively obtain the uncertainty results and corresponding sensitivity coefficients corresponding to each circuit parameter measurement value, and the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value; based on all uncertainty results and corresponding sensitivity coefficients, the synthetic standard uncertainty of the reference equivalent apparent power value is obtained.

[0113] Each module in the above-mentioned equivalent apparent power value acquisition device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0114] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 8As shown. The computer device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless means, and the wireless means can be implemented via Wi-Fi, a mobile cellular network, near-field communication (NFC), or other technologies. When executed by the processor, the computer program implements a method for obtaining an equivalent apparent power value. The display unit of the computer device is used to form a visually visible image, and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0115] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0116] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the following steps when executing the computer program: obtaining measurement conditions of a traceability circuit, and operating the traceability circuit according to the measurement conditions, wherein the measurement conditions include voltage conditions, resistance conditions, and current conditions; when the operating time of the traceability circuit reaches a preset time, obtaining circuit parameter measurement values ​​of the traceability circuit, wherein the circuit parameter measurement values ​​include a first active electric energy output on the power supply side, a second active electric energy received on the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; obtaining a reference equivalent apparent power value according to the circuit parameter measurement values; performing uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement values, and obtaining a target equivalent apparent power value according to the uncertainty evaluation result.

[0117] In one embodiment, the circuit parameter measurement value also includes a standard resistance value and the operating time of the traceability circuit; when the processor executes the computer program, the reference equivalent apparent power value is obtained based on the circuit parameter measurement value, including: multiplying the equivalent voltage measurement value by the square root of the target fraction as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electrical energy and the second active electrical energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0118] In one embodiment, the processor executes a computer program involving uncertainty assessment of a reference equivalent apparent power value based on circuit parameter measurement values, including: obtaining uncertainty results and corresponding sensitivity coefficients corresponding to each circuit parameter measurement value, respectively, where the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value; and obtaining a composite standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and corresponding sensitivity coefficients.

[0119] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: obtaining measurement conditions of a traceability circuit, and operating the traceability circuit according to the measurement conditions, the measurement conditions including voltage conditions, resistance conditions, and current conditions; obtaining circuit parameter measurement values ​​of the traceability circuit when the operating time of the traceability circuit reaches a preset time, the circuit parameter measurement values ​​including a first active electric energy output on the power supply side, a second active electric energy received on the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; obtaining a reference equivalent apparent power value according to the circuit parameter measurement values; performing uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement values, and obtaining a target equivalent apparent power value according to the uncertainty evaluation result.

[0120] In one embodiment, the circuit parameter measurement value also includes a standard resistance value and the operating time of the traceability circuit; when the computer program is executed by the processor, the reference equivalent apparent power value is obtained based on the circuit parameter measurement value, including: multiplying the product of the equivalent voltage measurement value and the square root of the target fraction as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electrical energy and the second active electrical energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0121] In one embodiment, when a computer program is executed by a processor, the uncertainty assessment of a reference equivalent apparent power value based on a circuit parameter measurement value is performed, including: obtaining the uncertainty results and corresponding sensitivity coefficients corresponding to each circuit parameter measurement value, respectively, where the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value; and obtaining the combined standard uncertainty of the reference equivalent apparent power value based on all the uncertainty results and the corresponding sensitivity coefficients.

[0122] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps: obtaining measurement conditions of a traceability circuit, and operating the traceability circuit according to the measurement conditions, the measurement conditions including voltage conditions, resistance conditions, and current conditions; obtaining circuit parameter measurement values ​​of the traceability circuit when the operating time of the traceability circuit reaches a preset time, the circuit parameter measurement values ​​including a first active electric energy output on the power supply side, a second active electric energy received on the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; obtaining a reference equivalent apparent power value based on the circuit parameter measurement values; performing uncertainty evaluation on the reference equivalent apparent power value based on the circuit parameter measurement values, and obtaining a target equivalent apparent power value based on the uncertainty evaluation result.

[0123] In one embodiment, the circuit parameter measurement value also includes a standard resistance value and the operating time of the traceability circuit; when the computer program is executed by the processor, the reference equivalent apparent power value is obtained based on the circuit parameter measurement value, including: multiplying the product of the equivalent voltage measurement value and the square root of the target fraction as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electrical energy and the second active electrical energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

[0124] In one embodiment, when a computer program is executed by a processor, the uncertainty assessment of a reference equivalent apparent power value based on a circuit parameter measurement value is performed, including: obtaining the uncertainty results and corresponding sensitivity coefficients corresponding to each circuit parameter measurement value, respectively, where the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value; and obtaining the combined standard uncertainty of the reference equivalent apparent power value based on all the uncertainty results and the corresponding sensitivity coefficients.

[0125] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0126] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, 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 application.

[0127] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A traceability circuit, characterized in that: include: Power module; a resistance module, connected to the power module, comprising at least one standard resistor, the number of which is the same as the number of wirings of the power module; a measuring module connected to the power module and configured to measure circuit parameters, wherein the circuit parameters include a first active electric energy outputted by the power supply side, a second active electric energy received by the load side, an equivalent apparent power, and an equivalent voltage; The load module is connected to the power module.

2. The traceability circuit according to claim 1, characterized in that: The measurement module includes: a first electric energy measuring unit, connected in series with the power module, and configured to measure a first active electric energy output by the power module; a second electric energy measuring unit, connected in series with the load module, for measuring a second active electric energy received by the load module; an apparent power measurement unit, connected in series with the power module, for measuring the equivalent apparent power of the traceability circuit; The equivalent voltage measuring unit is connected in parallel to the branch where the apparent power measuring unit is located, and is used to measure the equivalent voltage of the branch.

3. The traceability circuit according to claim 2, characterized in that: The power supply module is a single-phase power supply; the resistance module includes a standard resistor, which is connected in series between the first electric energy measurement unit and the second electric energy measurement unit; the measurement module is connected in series to the single-phase line of the power supply module.

4. The traceability circuit according to claim 1, characterized in that: The power supply module is a three-phase three-wire power supply, and the measuring module is connected to each phase line of the power supply module through corresponding terminals.

5. The traceability circuit according to claim 1, characterized in that: The power supply module is a three-phase four-wire power supply, and the measurement module is further connected to the neutral phase line of the power supply module through a neutral line terminal.

6. A method for obtaining equivalent apparent power value, characterized in that: Applied to the traceability circuit according to any one of claims 1 to 5; the method comprises: Acquiring measurement conditions of the traceability circuit, and operating the traceability circuit according to the measurement conditions, wherein the measurement conditions include voltage conditions, resistance conditions, and current conditions; When the operation time of the traceability circuit reaches a preset time, obtaining circuit parameter measurement values ​​of the traceability circuit, the circuit parameter measurement values ​​including a first active electric energy output by the power supply side, a second active electric energy received by the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; Obtaining a reference equivalent apparent power value according to the circuit parameter measurement value; An uncertainty evaluation is performed on the reference equivalent apparent power value according to the circuit parameter measurement value, and a target equivalent apparent power value is obtained according to the uncertainty evaluation result.

7. The method according to claim 6, characterized in that The circuit parameter measurement value also includes a standard resistance value and the operating time of the traceability circuit; and obtaining a reference equivalent apparent power value based on the circuit parameter measurement value includes: The product of the equivalent voltage measurement value and the square root of the target fraction is used as the reference equivalent apparent power value, the numerator of the target fraction is the difference between the first active electrical energy and the second active electrical energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

8. The method according to claim 6, characterized in that The performing uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement value includes: Respectively obtaining an uncertainty result and a corresponding sensitivity coefficient corresponding to each of the circuit parameter measurement values, wherein the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value; The combined standard uncertainty of the reference equivalent apparent power value is obtained according to all uncertainty results and corresponding sensitivity coefficients.

9. An equivalent apparent power value acquisition device, characterized in that: Applicable to the traceability circuit according to any one of claims 1 to 5; the device comprises: A circuit operation module, configured to obtain measurement conditions of the traceability circuit and operate the traceability circuit according to the measurement conditions, wherein the measurement conditions include voltage conditions, resistance conditions, and current conditions; a measurement value acquisition module, configured to obtain circuit parameter measurement values ​​of the traceability circuit when the operation time of the traceability circuit reaches a preset time, the circuit parameter measurement values ​​including a first active electric energy output by the power supply side, a second active electric energy received by the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; A reference value acquisition module, configured to acquire a reference equivalent apparent power value based on the circuit parameter measurement value; The target value acquisition module is used to perform uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement value, and obtain the target equivalent apparent power value according to the uncertainty evaluation result.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 6 to 8 are implemented.

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