A method for temperature adaptive calibration accuracy of power metering equipment

Abstract

The present invention discloses a method for temperature adaptive calibration accuracy of electric power metering equipment. The host computer obtains the online electric power metering equipment list through the three-phase AC source equipment, and the intelligent temperature control system obtains the temperature of the electric power metering equipment and the ambient temperature; the intelligent temperature control system reads the electric power metering equipment back and forth, and compares the data information of the meter reading with the preset value of the three-phase AC source equipment; the three-phase AC source equipment presets different temperature values ​​of the electric power metering equipment according to different temperature sections, and regularly interacts electrically with the electric power metering equipment; it detects whether the data information of the meter reading of the intelligent temperature control system and the data error of the three-phase AC source equipment in the same preset temperature section are within 0.2%, and performs statistics and data error compensation respectively. The present invention not only improves the calibration efficiency, but also reduces the calibration cost, and meets the large-scale and high-efficiency calibration requirements.

Description

Technical Field

[0001] The invention relates to the technical field of electric power metering equipment, and in particular to a method for temperature adaptive calibration accuracy of electric power metering equipment. Background Art

[0002] With the continuous advancement of power grid technology, the accuracy requirements for power metering equipment are becoming increasingly stringent. However, when facing temperature changes, the existing power metering equipment often has deviations in measurement accuracy due to factors such as material thermal expansion and changes in electronic component performance. This not only affects the accuracy of metering data, but also poses a potential threat to the safe and stable operation of the power grid.

[0003] Traditional calibration methods mainly rely on manual operation, which is not only inefficient but also difficult to ensure the accuracy of calibration. In addition, with the increasing number of power metering equipment, traditional calibration methods can no longer meet the needs of large-scale and efficient calibration. Therefore, it is particularly important to develop a method for temperature adaptive calibration accuracy of power metering equipment. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for temperature adaptive calibration accuracy of electric power metering equipment, which is characterized by comprising the following steps:

[0005] S1. The host computer obtains the list of online power metering devices through the three-phase AC source device, and the intelligent temperature control device obtains the temperature of the power metering device and the ambient temperature;

[0006] S2. Based on S1, the intelligent temperature control device reads the meter of the power metering device back and forth, and compares the meter reading data information with the preset value of the three-phase AC source device;

[0007] S3. Based on S2, the three-phase AC source device presets different temperature values ​​of the power metering device according to different temperature ranges, and performs electrical interaction with the power metering device at regular intervals;

[0008] S4.1. Based on S3, if the data information of the meter reading of the intelligent temperature control device and the data error of the three-phase AC source device in the same preset temperature range are within 0.2%, the temperature data of the power metering device is read and transmitted back to the host computer, and the accuracy of the power metering device is recorded and statistics are performed;

[0009] S4.2, based on S3, if the data information of the meter reading of the intelligent temperature control device and the data error of the three-phase AC source device in the same preset temperature range is greater than 0.2%, the accuracy of the power metering device is unqualified, and the three-phase AC source device performs a data error compensation operation on the power metering device;

[0010] S5.1. Based on S4.2, if the temperature calibration of the power metering device after the data error compensation operation is successful, the successfully calibrated temperature data is transmitted back to the host computer and counted, and the accuracy of the power metering device is recorded as qualified;

[0011] S5.2. Based on S4.2, if the temperature calibration of the power metering device after the data error compensation operation fails, the failure information is recorded and transmitted back to the host computer for statistics.

[0012] Preferably, in step S4.2, the three-phase AC source device performs the following steps to perform data error compensation operation on the power metering device:

[0013] S6. When the three-phase AC source device continues to supply power, turn on the temperature compensation switch of the power metering device, read the state of the temperature compensation switch, and ensure that the temperature compensation switch is turned on;

[0014] S7. Based on S6, the three-phase AC source device clears the correction parameters, and selects a temperature point within the range of -40°C to 100°C to perform gain correction and phase correction on the power metering device according to the operating temperature required by different types of power metering devices;

[0015] S8, based on S7, after the calibration is completed, the power metering device saves the temperature compensation parameter and the temperature value to the parameter storage area, and adjusts the temperature parameter of the power metering device;

[0016] S9. Based on S8, the intelligent temperature control device continuously reads the temperature data of the power metering device after calibration three times;

[0017] S10.1. Based on S9, if the mutual error of the temperature data after reading three times of calibration is less than 0.2%, it means that the temperature calibration of the power metering device at this temperature point is successful, and the temperature data is transmitted back to the host computer;

[0018] S10.2, based on S9, if the mutual error of the temperature data after reading three times of calibration is greater than 0.2%, it means that the power metering device cannot be calibrated at this temperature point, and the information of the power metering device is transmitted back to the host computer, and the power metering device is recorded as a hardware problem;

[0019] S11. Based on S10.1, perform data error compensation operation on at least five other different temperature points of the power metering device, repeat steps S6 to S10.2 until all selected temperature points are calibrated, and the temperature data of all power metering devices that have passed the calibration test are transmitted back to the host computer, and the accuracy of the power metering device is recorded as qualified.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The host computer of the present invention obtains the list of online power metering devices through the three-phase AC source device, and the intelligent temperature control system obtains the temperature of the power metering device and the ambient temperature; the intelligent temperature control system reads the meter of the power metering device back and forth, and compares the data information of the meter reading with the preset value of the three-phase AC source device; the three-phase AC source device presets different temperature values ​​of the power metering device according to different temperature sections, and regularly interacts with the power metering device electrically; it detects whether the data information of the meter reading of the intelligent temperature control system and the data error of the three-phase AC source device in the same preset temperature section are within 0.2%, and performs statistics and data error compensation respectively. The present invention enables the power metering device to automatically adjust the accuracy curve of the power metering device according to the ambient temperature through the cooperation of the three-phase AC source device and the intelligent temperature control device, which not only improves the calibration efficiency, but also reduces the calibration cost, and meets the large-scale and high-efficiency calibration requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the overall flow chart of the present invention.

[0023] Figure 2 This is a curve diagram of the accuracy change of the electric power metering device of the present invention after data error compensation. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 As shown, the method for temperature adaptive calibration accuracy of electric power metering equipment comprises the following steps:

[0028] S1. The host computer obtains the list of online power metering devices through the three-phase AC source device, and the intelligent temperature control device obtains the temperature of the power metering device and the ambient temperature;

[0029] S2. Based on S1, the intelligent temperature control device reads the meter of the power metering device back and forth, and compares the meter reading data information with the preset value of the three-phase AC source device;

[0030] S3. Based on S2, the three-phase AC source device presets different temperature values ​​of the power metering device according to different temperature ranges, and performs electrical interaction with the power metering device at regular intervals;

[0031] S4.1. Based on S3, if the data information of the meter reading of the intelligent temperature control device and the data error of the three-phase AC source device in the same preset temperature range are within 0.2%, the temperature data of the power metering device is read and transmitted back to the host computer, and the accuracy of the power metering device is recorded and statistics are performed;

[0032] S4.2, based on S3, if the data information of the meter reading of the intelligent temperature control device and the data error of the three-phase AC source device in the same preset temperature range is greater than 0.2%, the accuracy of the power metering device is unqualified, and the three-phase AC source device performs a data error compensation operation on the power metering device;

[0033] S5.1. Based on S4.2, if the temperature calibration of the power metering device after the data error compensation operation is successful, the successfully calibrated temperature data is transmitted back to the host computer and counted, and the accuracy of the power metering device is recorded as qualified;

[0034] S5.2. Based on S4.2, if the temperature calibration of the power metering device after the data error compensation operation fails, the failure information is recorded and transmitted back to the host computer for statistics.

[0035] In this embodiment, the three-phase AC source device can automatically adjust the ambient temperature according to the temperature range and dwell time manually input. Through the precise temperature control system, the stability and accuracy of the ambient temperature are ensured, providing reliable environmental conditions for the calibration of the power metering device. The three-phase AC source device can adjust the metering accuracy curve in real time according to the temperature data collected by its MCU (microcontroller unit). This function enables the power metering device to automatically adjust its metering accuracy according to the actual situation under different temperature environments, thereby maintaining stable accuracy performance.

[0036] Specifically, the power metering equipment can achieve precise control of the metering accuracy by adjusting parameters such as voltage and current gain and phase calibration. This function not only improves the accuracy stability of the power metering equipment, but also reduces the metering error caused by temperature changes.

[0037] The power metering equipment, intelligent temperature control equipment and three-phase AC source equipment can communicate with each other in real time. Through this function, the power metering equipment can receive calibration instructions or temperature data from the intelligent temperature control equipment and the three-phase AC source equipment, and upload its own calibration status and results to the three-phase AC source equipment or the host computer for recording and analysis. This real-time communication function ensures the timeliness and accuracy of the calibration process, so that the power metering equipment can be calibrated in a timely and effective manner under different temperature environments.

[0038] The three-phase AC source device supports wired or wireless communication with intelligent temperature control equipment, host computers or other management systems. Through this function, the three-phase AC source device can receive calibration instructions, upload calibration status and results, and realize remote monitoring and management. At the same time, the three-phase AC source device also has fault detection and alarm functions. During the calibration process, the operating status of the metering product is monitored in real time. Once an abnormality or fault is found, it will automatically alarm and prompt the treatment measures. This function ensures the safety and reliability of the calibration process.

[0039] In this embodiment, in order to ensure the temperature stability and calibration efficiency, the space capacity of the three-phase AC source device is moderate and the airtightness is good, so that the three-phase AC source device can accommodate the common power metering devices currently on the market, such as 50 concentrators, for automatic calibration at the same time, which not only improves the calibration efficiency but also reduces the calibration cost. In addition, the three-phase AC source device also has a statistical function, supporting operations such as adding, deleting, checking, and modifying. Through this function, the number of currently calibrated power metering devices can be easily counted and their device numbers can be recorded. At the same time, it also supports the export of batch records to facilitate subsequent data analysis and tracing.

[0040] In step S4.2, the three-phase AC source device performs data error compensation operation on the power metering device as follows:

[0041] S6. When the three-phase AC source device continues to supply power, turn on the temperature compensation switch of the power metering device, read the state of the temperature compensation switch, and ensure that the temperature compensation switch is turned on;

[0042] S7. Based on S6, the three-phase AC source device clears the correction parameters, and selects a temperature point within the range of -40°C to 100°C to perform gain correction and phase correction on the power metering device according to the operating temperature required by different types of power metering devices;

[0043] S8. Based on S7, after the calibration is completed, the power metering device saves the temperature compensation parameter and the temperature value to the parameter storage area, and adjusts the temperature parameter of the power metering device; specifically, when the subsequent detected temperature reaches the temperature range of the temperature compensation, the parameter can be called to ensure the temperature error accuracy of the power metering device.

[0044] S9. Based on S8, the intelligent temperature control device continuously reads the temperature data of the power metering device after calibration three times;

[0045] S10.1. Based on S9, if the mutual error of the temperature data after reading three times of calibration is less than 0.2%, it means that the temperature calibration of the power metering device at this temperature point is successful, and the temperature data is transmitted back to the host computer;

[0046] S10.2, based on S9, if the mutual error of the temperature data after reading three times of calibration is greater than 0.2%, it means that the power metering device cannot be calibrated at this temperature point, and the information of the power metering device is transmitted back to the host computer, and the power metering device is recorded as a hardware problem;

[0047] S11. Based on S10.1, perform data error compensation operation on at least five other different temperature points of the power metering device, repeat steps S6 to S10.2 until all selected temperature points are calibrated, and the temperature data of all power metering devices that have passed the calibration test are transmitted back to the host computer, and the accuracy of the power metering device is recorded as qualified.

[0048] In specific practice, the practice setting is: 1 intelligent temperature control device + N power metering devices, and the three-phase AC source device performs precision temperature compensation. Since multiple power metering devices are usually installed in a closed space with an output temperature of -40℃~100℃, the temperature control reaches a stable temperature of -30℃, -25℃, -20℃...70℃, 73℃, 80℃, 85℃ at intervals of 5 degrees. In theory, if the power metering equipment and external factors are consistent, the temperature curve of the table can be completely consistent, and it is easy to compensate for the accuracy of each temperature segment of each device.

[0049] But in fact, the temperature rise of the power metering equipment itself is nonlinear, and the temperature curve presented by each power metering equipment is not consistent. In addition, the temperature rise speed is also inconsistent due to the different positions in the enclosed space, so it is difficult to ensure that each meter is in the same temperature range. Here, the steps of the data error compensation operation of the present invention select and correct the working temperature required by different types of power metering equipment, and the staff can synchronously update the calibration temperature range of different types of power metering equipment on the host computer.

[0050] Specifically, assuming that we have N power metering devices, the curve of their temperature changing with time can be expressed as Ti(t), where i is the number of the meter device, t is the time, and the output temperature of the power metering device that needs temperature control can be expressed as Tset(t).

[0051] Initialize the output temperature Tset(0) of the intelligent temperature control device.

[0052] For each target temperature Ttarget,j:

[0053] a. Measure the temperature Ti(t) of each meter device in real time.

[0054] b. Calculate the deviation of each meter device from the target temperature ΔTi(t) = Ti(t) - Ttarget,j.

[0055] c. Adjust the output temperature Tset(t) of the temperature control device according to the deviation to reduce the deviation.

[0056] d. Repeat steps ac until the temperatures of all meter devices are within tolerance.

[0057] Move to the next target temperature and repeat step b.

[0058] The above control strategy can be expressed mathematically as:

[0059] Tset(t)=f(Ttarget,j,{ΔTi(t)}i=1N, previous Tset(t))

[0060] Where f is a control function, which calculates the new output temperature based on the current target temperature, the temperature deviation of each power metering device and the previous output temperature of the intelligent temperature control device, so that for each target temperature Ttarget,j (where j is the number of the target temperature), the temperature Ti(t) of all meter devices can be stabilized within the given tolerance ±tolerance as quickly as possible.

[0061] Depend on Figure 2 It can be seen that after the calibration method of the present invention, when the calibration is completed at room temperature 20°C-30°C, the calibration accuracy range of the calibration method of the present invention and the manual calibration method in the prior art is between 0.00 and 0.1%, which meets the State Grid's requirement of 0.5S for the electric energy pulse accuracy.

[0062] As the temperature changes, the metering accuracy of the power metering equipment also increases. In the low temperature range of -40°C to 20°C, the error of the manual calibration method using the prior art is 0.1% to 0.3%. In the high temperature range of 60°C to 80°C, the error of the manual calibration method using the prior art is 0.3% to -0.8%, which can no longer meet the State Grid's requirements for the accuracy of the corresponding electric energy pulses. The calibration method of the present invention can control the accuracy range after calibration within 0.2% regardless of low or high temperatures, and has strong practicality.

[0063] The method for temperature adaptive calibration accuracy of electric power metering equipment provided by the present invention has the following advantages:

[0064] Improve metering accuracy: By adaptively adjusting the accuracy curve of the power metering equipment, the impact of temperature changes on metering accuracy is effectively resolved. This function enables the power metering equipment to maintain stable accuracy performance under different temperature environments, improving the accuracy and reliability of metering data;

[0065] Realize batch automatic calibration: The combination of intelligent temperature control equipment and three-phase AC source equipment realizes batch automatic temperature calibration. It not only improves the calibration efficiency, but also reduces the calibration cost, meeting the needs of large-scale and high-efficiency calibration;

[0066] Enhanced product reliability: The verification function of the power metering equipment after multiple calibrations ensures that the accuracy of each power metering equipment after calibration meets the standards. This function enhances the reliability of the product and reduces the risk of power grid operation caused by metering errors.

[0067] Convenient data management and traceability: The statistical function provided facilitates the management and traceability of calibration data. By exporting batch records and analyzing data, problems in the calibration process can be discovered and handled in a timely manner, providing strong support for subsequent product improvement and optimization;

[0068] Improve grid operation efficiency: By ensuring the accuracy, stability and reliability of power metering equipment, grid losses and energy waste caused by metering errors can be reduced. At the same time, the realization of batch automatic calibration function also reduces the cost and time cost of grid operation and maintenance.

[0069] The present invention not only solves the problem of unstable accuracy of existing power metering equipment under temperature changes, but also realizes the batch automatic temperature calibration function, provides a strong guarantee for the safe and stable operation of the power grid, and has significant technical advantages and application value.

[0070] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A method for temperature adaptive calibration accuracy of power metering equipment, characterized in that: The following steps are involved: S1. The host computer obtains the list of online power metering devices through the three-phase AC source device, and the intelligent temperature control device obtains the temperature of the power metering device and the ambient temperature; S2. Based on S1, the intelligent temperature control device reads the meter of the power metering device back and forth, and compares the meter reading data information with the preset value of the three-phase AC source device; S3. Based on S2, the three-phase AC source device presets different temperature values ​​of the power metering device according to different temperature ranges, and performs electrical interaction with the power metering device at regular intervals; S4.

1. Based on S3, if the data information of the meter reading of the intelligent temperature control device and the data error of the three-phase AC source device in the same preset temperature range are within 0.2%, the temperature data of the power metering device is read and transmitted back to the host computer, and the accuracy of the power metering device is recorded and statistics are performed; S4.2, based on S3, if the data information of the meter reading of the intelligent temperature control device and the data error of the three-phase AC source device in the same preset temperature range is greater than 0.2%, the accuracy of the power metering device is unqualified, and the three-phase AC source device performs a data error compensation operation on the power metering device; S5.

1. Based on S4.2, if the temperature calibration of the power metering device after the data error compensation operation is successful, the successfully calibrated temperature data is transmitted back to the host computer and counted, and the accuracy of the power metering device is recorded as qualified; S5.

2. Based on S4.2, if the temperature calibration of the power metering device after the data error compensation operation fails, the failure information is recorded and transmitted back to the host computer for statistics.

2. The method for temperature adaptive calibration accuracy of electric power metering equipment according to claim 1, characterized in that: In step S4.2, the three-phase AC source device performs the following steps to perform data error compensation on the power metering device: S6. When the three-phase AC source device continues to supply power, turn on the temperature compensation switch of the power metering device, read the state of the temperature compensation switch, and ensure that the temperature compensation switch is turned on; S7. Based on S6, the three-phase AC source device clears the correction parameters, and selects a temperature point within the range of -40°C to 100°C to perform gain correction and phase correction on the power metering device according to the operating temperature required by different types of power metering devices; S8, based on S7, after the calibration is completed, the power metering device saves the temperature compensation parameter and the temperature value to the parameter storage area, and adjusts the temperature parameter of the power metering device; S9. Based on S8, the intelligent temperature control device continuously reads the temperature data of the power metering device after calibration three times; S10.

1. Based on S9, if the mutual error of the temperature data after reading three times of calibration is less than 0.2%, it means that the temperature calibration of the power metering device at this temperature point is successful, and the temperature data is transmitted back to the host computer; S10.2, based on S9, if the mutual error of the temperature data after reading three times of calibration is greater than 0.2%, it means that the power metering device cannot be calibrated at this temperature point, and the information of the power metering device is transmitted back to the host computer, and the power metering device is recorded as a hardware problem; S11. Based on S10.1, perform data error compensation operation on at least five other different temperature points of the power metering device, repeat steps S6 to S10.2 until all selected temperature points are calibrated, and the temperature data of all power metering devices that have passed the calibration test are transmitted back to the host computer, and the accuracy of the power metering device is recorded as qualified.

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