Traceability circuit, equivalent apparent power value acquisition method, device and computer equipment

Abstract

The application relates to a traceability circuit, an equivalent apparent power value acquisition method, a device and a computer equipment. The method comprises the following steps: obtaining a measurement condition of the traceability circuit, running the traceability circuit according to the measurement condition, obtaining a circuit parameter measurement value of the traceability circuit in the case that the running duration of the traceability circuit reaches a preset duration, obtaining a reference equivalent apparent power value according to the circuit parameter measurement value, 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 the uncertainty evaluation result. The method can realize the traceability of the equivalent apparent power value, and improve the measurement accuracy of the equivalent apparent power.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a traceability circuit, a method, apparatus and computer equipment for obtaining equivalent apparent power values. Background Technology

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

[0003] Currently, a unified standard has been established for single-phase apparent power measurement. However, three generally accepted definitions of apparent power exist in three-phase circuits (arithmetic, vector, and equivalent), and their measurement formulas are not yet standardized. Significant differences between apparent power and power factor under different definitions can lead to inaccurate measurement results, thus affecting the incentive effect of power quality management. Among these, the equivalent apparent power definition can more accurately assess the energy transmission efficiency of transmission lines under non-sinusoidal and unbalanced operating conditions, and is more reasonable than the other two definitions. However, there is currently no physical standard or related traceability method for equivalent apparent power, resulting in a lack of unified evaluation criteria for the measurement results of various instruments. Therefore, a method for accurately obtaining the equivalent apparent power value is urgently needed. Summary of the Invention

[0004] Therefore, it is necessary to provide a traceability circuit, a method, apparatus, and computer device for obtaining equivalent apparent power values ​​that can improve the accuracy of equivalent apparent power in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides a traceability circuit, including:

[0006] Power module;

[0007] A resistor module, connected to a power module, includes at least one standard resistor, the number of which is the same as the number of wires in the power module.

[0008] The measurement module, connected to the power supply module, is used to measure circuit parameters, including the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power, and the equivalent voltage.

[0009] The load module is connected to the power supply module.

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

[0011] The first electrical energy measurement unit is connected in series with the power supply module and is used to measure the first active electrical energy output by the power supply module.

[0012] The second energy measurement unit is connected in series with the load module and is used to measure the second active energy received by the load module.

[0013] Apparent power measurement unit, connected in series with the power module, is used to measure the equivalent apparent power of the trace circuit;

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

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

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

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

[0018] Secondly, this application provides a method for obtaining an equivalent apparent power value, including:

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

[0020] When the running time of the traceability circuit reaches the preset time, the circuit parameter measurement values ​​of the traceability circuit are obtained. The circuit parameter measurement values ​​include the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value.

[0021] Based on the measured values ​​of the circuit parameters, obtain the reference equivalent apparent power value;

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

[0023] In one embodiment, the circuit parameter measurements further include 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 measurements includes:

[0024] The product of the equivalent voltage measurement 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.

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

[0026] The uncertainty results and corresponding sensitivity coefficients for each circuit parameter measurement value are obtained respectively. The sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement value on the reference equivalent apparent power value.

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

[0028] Thirdly, this application also provides an equivalent apparent power value acquisition device, comprising:

[0029] The circuit operation module is used to obtain the measurement conditions of the traceability circuit and run the traceability circuit according to the measurement conditions, including voltage conditions, resistance conditions and current conditions.

[0030] The measurement value acquisition module is used to acquire the circuit parameter measurement values ​​of the traceability circuit when the running time of the traceability circuit reaches a preset time. The circuit parameter measurement values ​​include the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value.

[0031] The reference value acquisition module is used to obtain the reference equivalent apparent power value based on the measured values ​​of circuit parameters;

[0032] The target value acquisition module is used to evaluate the uncertainty of the reference equivalent apparent power value based on the measured values ​​of circuit parameters, and to obtain the target equivalent apparent power value based on the uncertainty evaluation results.

[0033] Fourthly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method steps of any one of the second aspects.

[0034] Fifthly, this application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method steps of any one of the second aspects.

[0035] In a sixth aspect, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the method steps of any one of the second aspects.

[0036] The aforementioned traceability circuit, equivalent apparent power value acquisition method, apparatus, and computer equipment acquire the measurement conditions of the traceability circuit, operate the traceability circuit according to the measurement conditions, acquire the circuit parameter measurement values ​​of the traceability circuit when the running time of the traceability circuit reaches a preset time, acquire the reference equivalent apparent power value based on the circuit parameter measurement values, evaluate the uncertainty of the reference equivalent apparent power value based on the circuit parameter measurement values, and acquire the target equivalent apparent power value based on the uncertainty evaluation results. This can quantify the reliability of the measurement results, clarify the deviation range between the measured value and the true value, realize traceability to higher metrological standards, and ensure the accuracy of the measured equivalent apparent power value. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of a traceability circuit in one embodiment;

[0039] Figure 2 This is a schematic diagram of the source circuit for single-phase equivalent apparent power in one embodiment;

[0040] Figure 3 This is a schematic diagram of the source circuit for the three-phase three-wire equivalent apparent power in one embodiment;

[0041] Figure 4 This is a schematic diagram of a source circuit for the three-phase four-wire equivalent apparent power in one embodiment;

[0042] Figure 5 This is a flowchart illustrating an equivalent apparent power value acquisition method in one embodiment;

[0043] Figure 6 This is a flowchart illustrating an equivalent apparent power value acquisition method in another embodiment;

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

[0045] Figure 8 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] With the widespread integration of numerous new energy sources and power electronic devices into the power grid, the power load situation is becoming increasingly complex, exhibiting characteristics such as increased reactive power, load imbalance, increased harmonic content, and intensified voltage fluctuations. These "unintended" power components, including reactive power, load imbalance, and harmonics, inevitably increase energy losses in transmission lines, leading to reduced power grid energy transmission efficiency. This presents new challenges for 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 source of apparent power values.

[0048] Based on this, embodiments of this application provide a traceability circuit and a method for obtaining equivalent apparent power values, which can trace the equivalent apparent power measurement value to a standard metrological reference, thereby improving the accuracy of the equivalent apparent power value, maximizing the utilization of transmission lines, and reducing transmission energy loss.

[0049] In one exemplary embodiment, a traceability circuit is provided for realizing accurate measurement and traceability of physical quantities, wherein traceability is the 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 based on two measurement models. The first measurement model is established using the law of conservation of energy, specifically the transmission line loss ΔW. 损 It should be equal to the active electrical energy output from the power supply side (W). 源 With the active electrical energy W received by the load side 荷 The difference in measurement results, where the line loss and active power are linearly superimposed in the time domain, is given by the following measurement formula:

[0051]

[0052] Among them, measurement model two assumes the line impedance parameter R. s The load-side equivalent apparent power S and equivalent voltage V are given within the measurement time T. e The measurement results can also be used to measure line loss, and the measurement formula is as follows:

[0053]

[0054] In the above formula, R s The resistance value is the standard resistor value, S is the equivalent apparent power value, and V is the voltage.e The voltage 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 follows:

[0058]

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

[0060] In summary, ΔS calculated using the error model can intuitively reflect the magnitude of the measurement deviation of the equivalent apparent power meter to be traced. Once the deviation is identified, it can be determined whether the meter meets the accuracy requirements. If the deviation exceeds the allowable range, calibration or adjustment is necessary to make the meter's measured value closer to the true value, thereby enabling traceability of the measured value to the metrological standard value and ensuring the accuracy and reliability of the measurement results.

[0061] In one exemplary embodiment, such as Figure 1 As shown, the traceability circuit provided in this embodiment includes: a power supply module 100, a resistor module 200, a measurement module 300, and a load module 400. The resistor module 200 is connected to the power supply module 100 and includes at least one standard resistor; the number of standard resistors is the same as the number of wires in the power supply module 100. The measurement module 300 is connected to the power supply module 100 and is used to measure circuit parameters, including the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power, and the equivalent voltage. The load module 400 is connected to the power supply module 100.

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

[0063] In this embodiment, the measurement module measures the first active electrical energy output from the power supply side, the second active electrical energy received from the load side, the equivalent apparent power, and the equivalent voltage, which can accurately obtain the ideal equivalent apparent power value, thereby improving the accuracy of the tracing process.

[0064] In one exemplary embodiment, such as 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 this application. Figure 2 In this circuit, power module 100 is a single-phase power supply, and resistor module 200 includes a standard resistor R. s Standard resistor R s The measurement module 300 is connected in series between the first energy measurement unit 301 and the second energy measurement unit 302, and is also connected in series to the single-phase line of the power supply module 100. The first energy measurement unit 301 is a high-precision energy meter used to measure the first active energy W output from the power supply side. 源 The second energy measurement unit 302 is also a high-precision energy meter, used to measure the second active energy W received on the load side. 荷 Apparent power measurement unit 303 is a traceable apparent power meter used to measure the equivalent apparent power S. Equivalent voltage measurement unit 304 includes a custom voltmeter used to measure the equivalent voltage V. e .

[0065] Similarly, such as Figure 3 As shown and Figure 4 As shown, Figure 3 This is a schematic diagram of a three-phase three-wire equivalent apparent power tracing circuit as shown in an embodiment of this application. Figure 4 This is a schematic diagram of a three-phase four-wire equivalent apparent power traceability circuit as shown in an embodiment of this application. Figure 3 In this configuration, the power supply module 100 is a three-phase, three-wire power supply. The measurement module 300 is connected to each phase wire of the power supply module 100 via corresponding terminals, and the voltage and current input terminals for each phase are short-circuited. Figure 3 In this section, the three-phase three-wire instrument is connected via a direct connection, meaning the voltage and current input terminals for each phase are short-circuited. However... Figure 4 In this circuit, the power supply module 100 is a three-phase four-wire power supply, and the measurement module 300 is also connected to the neutral phase line of the power supply module 100 through the neutral line terminal.

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

[0067] In one exemplary embodiment, such as Figure 5As shown, a method for obtaining equivalent apparent power value is provided, which can be applied to... Figure 1 The traceability circuit shown is used as an example for illustration, including steps 502 to 508. Wherein:

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

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

[0070] S504: When the running time of the traceability circuit reaches the preset time, obtain the circuit parameter measurement values ​​of the traceability circuit. The circuit parameter measurement values ​​include the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value.

[0071] Optionally, when the traceability circuit has run for a preset time, the circuit parameters are measured by the measurement module. Specifically, the portion connected in series with the power supply module measures the first active energy output from the power supply side, the portion connected in series with the load module measures the second active energy received by the load side, the apparent power measurement unit connected in series with the power supply module measures the equivalent apparent power, and the equivalent voltage measurement unit is connected in parallel with the corresponding branch to measure the equivalent voltage. After the preset running time, the circuit reaches a stable state, and the measurements obtained at this point better reflect the actual operating conditions, reducing interference from transient processes.

[0072] S506: Obtain the reference equivalent apparent power value based on the measured values ​​of the circuit parameters.

[0073] Optionally, a reference equivalent apparent power value is obtained based on the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement, and the equivalent voltage measurement. This reference equivalent apparent power value serves as a benchmark to assess 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 based on the measured values ​​of the circuit parameters, and obtain the target equivalent apparent power value based on the uncertainty evaluation results.

[0075] Optionally, when performing uncertainty assessment, based on the measured values ​​of 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, the combined uncertainty is calculated through the uncertainty propagation law, and then the reference equivalent apparent power value is corrected or processed according to the assessment results to obtain the target equivalent apparent power value.

[0076] In the above-described method for obtaining the equivalent apparent power value, the measurement conditions of the traceability circuit are obtained, the traceability circuit is run according to the measurement conditions, and when the running time of the traceability circuit reaches a preset time, the measured values ​​of the circuit parameters of the traceability circuit are obtained. Based on the measured values ​​of the circuit parameters, a reference equivalent apparent power value is obtained. The uncertainty of the reference equivalent apparent power value is evaluated based on the measured values ​​of the circuit parameters, and the target equivalent apparent power value is obtained based on the uncertainty evaluation results. This method can quantify the reliability of the measurement results, clarify the deviation range between the measured value and the true value, realize traceability to higher metrological standards, and ensure the accuracy of the measured equivalent apparent power value.

[0077] In an exemplary embodiment, the circuit parameter measurements also include 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 measurements includes: using the product of the equivalent voltage measurement and the square root of a target fraction as the reference equivalent apparent power value, where the numerator of the target fraction is the difference between the first active energy and the second active energy, and the denominator of the target fraction is the product of the standard resistance value and the operating time.

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

[0079]

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

[0081] In this embodiment, the reference equivalent apparent power value is obtained based on the measured values ​​of circuit parameters, which can ensure the accuracy of the reference equivalent apparent power value and provide accurate data support for subsequent uncertainty assessment, thereby improving the accuracy of the equivalent apparent power value.

[0082] In an exemplary embodiment, the step of evaluating the uncertainty of a reference equivalent apparent power value based on circuit parameter measurements includes: obtaining the uncertainty result and corresponding sensitivity coefficient for each circuit parameter measurement, wherein the sensitivity coefficient is used to characterize the degree of influence of the circuit parameter measurement on the reference equivalent apparent power value; and obtaining the combined standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and corresponding sensitivity coefficients.

[0083] Optionally, the first active electrical energy output from the power supply side is obtained by the first electrical energy measurement unit in the measurement module. Its uncertainty mainly comes from the accuracy of the electrical energy measurement unit itself (such as the inherent error of the instrument and resolution limitations) and environmental factors (such as the influence of temperature and electromagnetic interference on the measurement). Its Type B standard uncertainty is determined according to the specifications or calibration certificate of the electrical energy meter. The second active electrical energy received by the load side is measured by the second electrical energy measurement unit. Its uncertainty comes from similar sources as the first active electrical energy, including the accuracy of the measurement unit and environmental factors. Similarly, the Type B uncertainty can be obtained from the specifications. The equivalent voltage measurement value is obtained by the equivalent voltage measurement unit. Its uncertainty comes from the accuracy of the voltmeter, the stability of the voltage in the line, etc. In addition, when obtaining the reference equivalent apparent power value, the resistance value of the standard resistor and the operating time need to be considered. The purpose of the standard resistor is to output a stable resistance. To ignore the influence of the connecting line impedance and improve the measurement resolution, the resistance value can be relatively larger, and its Type B standard uncertainty is calculated according to the data in the verification certificate or its specifications. It should be noted that Rs must reach a thermally stable state during the actual test. The runtime can be measured by a standard time base source, and its Type B standard uncertainty can be calculated according to the data in the calibration certificate.

[0084] Furthermore, the sensitivity coefficient reflects the degree of influence of the measured values ​​of each circuit parameter on the reference equivalent apparent power value. It is derived mathematically based on the relationship between each parameter and power in the traceability circuit. After obtaining the uncertainty results and sensitivity coefficients of 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 the reliable reference equivalent apparent power value, the measurement results of the traceable equivalent apparent power meter are traced back to the true value, making the measurement results of the traceable equivalent apparent power meter closer to the true value.

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

[0086]

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

[0088] The sensitivity coefficients for each item are as follows:

[0089]

[0090]

[0091]

[0092]

[0093]

[0094] In summary, since the measurement module has been calibrated according to the relevant metrological standards, the reference equivalent apparent power value obtained through the traceability circuit is traceable. This is achieved by comparing the measured value S of the equivalent apparent power meter to be traced with the reference equivalent apparent power value S. r A comparison was performed, and the reference equivalent apparent power value S was obtained. r The uncertainty results are used to characterize the reference equivalent apparent power value S. r The smaller the uncertainty, the better the reliability of S. r The higher the reliability, the better the value of S can be determined through reliable S. r Indirectly traceable to the corresponding metrological standards.

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

[0096] In this embodiment, by obtaining the uncertainty results and corresponding sensitivity coefficients corresponding to the measured values ​​of each circuit parameter, and based on all the uncertainty results and corresponding sensitivity coefficients, the combined standard uncertainty of the reference equivalent apparent power value is obtained. This quantifies the reliability of the measurement results, clarifies the deviation range between the measured value and the true value, enables traceability to higher metrological standards, and ensures the accuracy of the measured equivalent apparent power value.

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

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

[0099] S604: When the running time of the traceability circuit reaches the preset time, obtain the circuit parameter measurement values ​​of the traceability circuit. The circuit parameter measurement values ​​include the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value.

[0100] S606: The product of the equivalent voltage measurement 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.

[0101] S608: Obtain the uncertainty results and corresponding sensitivity coefficients for each circuit parameter measurement value. The sensitivity coefficients are used to characterize the influence of the circuit parameter measurement values ​​on the reference equivalent apparent power value. Based on all uncertainty results and corresponding sensitivity coefficients, obtain the combined standard uncertainty of the reference equivalent apparent power value.

[0102] S610: Obtain the target equivalent apparent power value based on the uncertainty assessment results.

[0103] In this embodiment, by acquiring the measurement conditions of the traceability circuit, the traceability circuit is run according to the measurement conditions. When the running time of the traceability circuit reaches the preset time, the measured values ​​of the circuit parameters of the traceability circuit are acquired. Based on the measured values ​​of the circuit parameters, a reference equivalent apparent power value is acquired. An uncertainty assessment is performed on the reference equivalent apparent power value based on the measured values ​​of the circuit parameters. Based on the uncertainty assessment results, the target equivalent apparent power value is acquired. This can quantify the reliability of the measurement results, clarify the deviation range between the measured value and the true value, realize traceability to higher metrological standards, and ensure the accuracy of the measured equivalent apparent power value.

[0104] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0105] Based on the same inventive concept, this application also provides an equivalent apparent power value acquisition device for implementing the equivalent apparent power value acquisition method described above. The solution provided by this device is similar to the implementation described in the above method; therefore, the specific limitations of one or more equivalent apparent power value acquisition device embodiments provided below can be found in the limitations of the equivalent apparent power value acquisition method described above, and will not be repeated here.

[0106] In one exemplary embodiment, such as 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 the measurement conditions of the traceability circuit and run the traceability circuit according to the measurement conditions, including voltage conditions, resistance conditions and current conditions.

[0108] The measurement value acquisition module 704 is used to acquire the circuit parameter measurement values ​​of the traceability circuit when the running time of the traceability circuit reaches a preset time. The circuit parameter measurement values ​​include the first active electrical energy output from the power supply side, the second active electrical energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value.

[0109] The reference value acquisition module 706 is used to acquire the reference equivalent apparent power value based on the measured values ​​of circuit parameters.

[0110] The target value acquisition module 708 is used to evaluate the uncertainty of the reference equivalent apparent power value based on the measured values ​​of circuit parameters, and to obtain the target equivalent apparent power value based on the uncertainty evaluation results.

[0111] In an exemplary embodiment, the circuit parameter measurements also include a standard resistance value and the operating time of the traceability circuit; the reference value acquisition module 706 is further configured to use the product of the equivalent voltage measurement and the square root of the target fraction as a reference equivalent apparent power value, wherein 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 further configured to acquire the uncertainty results and corresponding sensitivity coefficients corresponding to the measured values ​​of each circuit parameter, wherein the sensitivity coefficients are used to characterize the degree of influence of the measured values ​​of the circuit parameters on the reference equivalent apparent power value; and to acquire the combined standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and corresponding sensitivity coefficients.

[0113] The modules in the aforementioned equivalent apparent power value acquisition device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware within or independently of the processor in a computer device, or stored in software within the memory of the computer device, so that the processor can call and execute the operations corresponding to each module.

[0114] In one exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 8As shown, the computer device includes a processor, memory, input / output interfaces, a communication interface, a display unit, and an input device. The processor, memory, and input / output interfaces are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The input / output interfaces are used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When executed by the processor, the computer program implements an equivalent apparent power value acquisition method. The display unit 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 an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

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

[0116] In one exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps: acquiring measurement conditions of a traceability circuit; running the traceability circuit according to the measurement conditions, the measurement conditions including voltage conditions, resistance conditions, and current conditions; when the running time of the traceability circuit reaches a preset time, acquiring circuit parameter measurement values ​​of the traceability circuit, the circuit parameter measurement values ​​including a first active energy output from the power supply side, a second active energy received from the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; acquiring a reference equivalent apparent power value based on the circuit parameter measurement values; performing an uncertainty assessment on the reference equivalent apparent power value based on the circuit parameter measurement values; and acquiring a target equivalent apparent power value based on the uncertainty assessment result.

[0117] In one embodiment, the circuit parameter measurements also include a standard resistance value and the runtime of the traceability circuit; the process of obtaining a reference equivalent apparent power value based on the circuit parameter measurements when the processor executes the computer program includes: using the product of the equivalent voltage measurement and the square root of a target fraction as the reference equivalent apparent power value, where the numerator of the target fraction is the difference between the first active energy and the second active energy, and the denominator of the target fraction is the product of the standard resistance value and the runtime.

[0118] In one embodiment, the uncertainty assessment of the reference equivalent apparent power value based on the measured values ​​of circuit parameters when the processor executes the computer program includes: obtaining the uncertainty result and the corresponding sensitivity coefficient for each measured value of circuit parameters, wherein the sensitivity coefficient is used to characterize the degree of influence of the measured values ​​of circuit parameters on the reference equivalent apparent power value; and obtaining the combined standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and the 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, it performs the following steps: acquiring measurement conditions of a traceability circuit; running the traceability circuit according to the measurement conditions, the measurement conditions including voltage conditions, resistance conditions, and current conditions; when the running time of the traceability circuit reaches a preset time, acquiring circuit parameter measurement values ​​of the traceability circuit, the circuit parameter measurement values ​​including a first active energy output from the power supply side, a second active energy received from the load side, an equivalent apparent power measurement value, and an equivalent voltage measurement value; acquiring a reference equivalent apparent power value based on the circuit parameter measurement values; performing an uncertainty assessment on the reference equivalent apparent power value based on the circuit parameter measurement values; and acquiring a target equivalent apparent power value based on the uncertainty assessment result.

[0120] In one embodiment, the circuit parameter measurements also include a standard resistance value and the runtime of the traceability circuit; the computer program, when executed by the processor, involves obtaining a reference equivalent apparent power value based on the circuit parameter measurements, including: using the product of the equivalent voltage measurement and the square root of a target fraction as the reference equivalent apparent power value, where the numerator of the target fraction is the difference between a first active energy and a second active energy, and the denominator of the target fraction is the product of the standard resistance value and the runtime.

[0121] In one embodiment, when the computer program is executed by the processor, the uncertainty assessment of the reference equivalent apparent power value based on the measured values ​​of circuit parameters includes: obtaining the uncertainty results and corresponding sensitivity coefficients for each measured value of circuit parameters, wherein the sensitivity coefficients are used to characterize the degree of influence of the measured values ​​of circuit parameters on the reference equivalent apparent power value; and obtaining the combined standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and corresponding sensitivity coefficients.

[0122] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps: acquiring measurement conditions of a traceability circuit; running the traceability circuit according to the measurement conditions, the measurement conditions including voltage conditions, resistance conditions, and current conditions; when the running time of the traceability circuit reaches a preset duration, acquiring measured values ​​of circuit parameters of the traceability circuit, the measured values ​​of circuit parameters including a first active energy output from the power supply side, a second active energy received from the load side, a measured value of equivalent apparent power, and a measured value of equivalent voltage; acquiring a reference equivalent apparent power value based on the measured values ​​of circuit parameters; performing an uncertainty assessment on the reference equivalent apparent power value based on the measured values ​​of circuit parameters; and acquiring a target equivalent apparent power value based on the uncertainty assessment result.

[0123] In one embodiment, the circuit parameter measurements also include a standard resistance value and the runtime of the traceability circuit; the computer program, when executed by the processor, involves obtaining a reference equivalent apparent power value based on the circuit parameter measurements, including: using the product of the equivalent voltage measurement and the square root of a target fraction as the reference equivalent apparent power value, where the numerator of the target fraction is the difference between a first active energy and a second active energy, and the denominator of the target fraction is the product of the standard resistance value and the runtime.

[0124] In one embodiment, when the computer program is executed by the processor, the uncertainty assessment of the reference equivalent apparent power value based on the measured values ​​of circuit parameters includes: obtaining the uncertainty results and corresponding sensitivity coefficients for each measured value of circuit parameters, wherein the sensitivity coefficients are used to characterize the degree of influence of the measured values ​​of circuit parameters on the reference equivalent apparent power value; and obtaining the combined standard uncertainty of the reference equivalent apparent power value based on all uncertainty results and corresponding sensitivity coefficients.

[0125] Those skilled in the art will understand that all or part of the processes in the methods of 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, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, 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 many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0126] 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 application.

[0127] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this 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 application should be determined by the appended claims.

Claims

1. A method for obtaining equivalent apparent power value, characterized in that, Applied to traceability circuits, the method includes: Obtain the 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; When the running time of the traceability circuit reaches a preset time, the circuit parameter measurement values ​​of the traceability circuit are obtained. The circuit parameter measurement values ​​include the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value. Based on the measured values ​​of the circuit parameters, obtain the reference equivalent apparent power value; The uncertainty of the reference equivalent apparent power value is evaluated based on the measured values ​​of the circuit parameters, and the target equivalent apparent power value is obtained based on the uncertainty evaluation results. The traceability circuit includes a power supply module, a resistor module, a measurement module, and a load module. The resistor module is connected to the power supply module and includes at least one standard resistor, the number of which is the same as the number of wires connected to the power supply module. The measurement module is connected to the power supply module and is used to measure circuit parameters, including a first active energy output from the power supply side, a second active energy received from the load side, equivalent apparent power, and equivalent voltage. The load module is connected to the power supply module.

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

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

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

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

6. The method according to claim 1, characterized in that, The measured circuit parameters also include the standard resistance value and the operating time of the traceability circuit; obtaining the reference equivalent apparent power value based on the measured circuit parameters includes: The product of the equivalent voltage measurement 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.

7. The method according to claim 1, characterized in that, The uncertainty assessment of the reference equivalent apparent power value based on the measured values ​​of the circuit parameters includes: The uncertainty results and corresponding sensitivity coefficients for each of the circuit parameter measurement values ​​are obtained respectively. The sensitivity coefficients are used to characterize the degree of influence of the circuit parameter measurement values ​​on the reference equivalent apparent power value. Based on all uncertainty results and the corresponding sensitivity coefficients, the combined standard uncertainty of the reference equivalent apparent power value is obtained.

8. An equivalent apparent power value acquisition device, characterized in that, The apparatus, applied to the method for obtaining the equivalent apparent power value as described in any one of claims 1-7, comprises: The circuit operation module is used to acquire the measurement conditions of the traceability circuit and run the traceability circuit according to the measurement conditions, including voltage conditions, resistance conditions and current conditions; The measurement value acquisition module is used to acquire circuit parameter measurement values ​​of the traceability circuit when the running time of the traceability circuit reaches a preset time. The circuit parameter measurement values ​​include the first active energy output from the power supply side, the second active energy received from the load side, the equivalent apparent power measurement value, and the equivalent voltage measurement value. The reference value acquisition module is used to acquire a reference equivalent apparent power value based on the measured values ​​of the circuit parameters; The target value acquisition module is used to perform uncertainty assessment on the reference equivalent apparent power value based on the measured values ​​of the circuit parameters, and to obtain the target equivalent apparent power value based on the uncertainty assessment result.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

Images