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CN-121995296-A - Voltage influence error suppression method, electric energy meter and storage medium

CN121995296ACN 121995296 ACN121995296 ACN 121995296ACN-121995296-A

Abstract

The application discloses a voltage influence error suppression method, an electric energy meter and a storage medium. The method is applied to the electric energy meter and comprises the steps of respectively adjusting the structure and the parameters of a transformer, the structure and the parameters of a manganese-copper shunt and the parameters of a metering chip, and compensating and calibrating the error change amount of the electric energy meter through a control module. The application adjusts the structure and parameters of the transformer aiming at the interference source to reduce the influence on other devices, adjusts the structure and parameters of the manganese-copper shunt aiming at the interfered device to reduce the influence, and adjusts the parameters of the metering chip to reduce the relative interference. And from the software perspective, the actual error of the electric energy meter is compensated, and the voltage influence is further restrained. By the method, the voltage influence is restrained from multiple aspects, the error change amount is controlled to be within 1% from the original standard limit value, the national standard is far exceeded, and the higher internal control index of an enterprise is met.

Inventors

  • ZHOU SHUFENG
  • HUANG ZHI
  • SHEN WENQUAN

Assignees

  • 深圳市思达仪表有限公司

Dates

Publication Date
20260508
Application Date
20260106

Claims (10)

  1. 1. The voltage influence error suppression method is applied to an electric energy meter and is characterized by comprising a power supply module, a sampling module, a metering module and a control module, wherein the sampling module, the metering module and the control module are sequentially connected, and the power supply module is respectively connected with the sampling module, the metering module and the control module; the voltage influence error suppression method comprises the following steps: respectively adjusting the structure and parameters of the transformer, the structure and parameters of the manganese-copper shunt and the parameters of the metering chip; and compensating and calibrating the error change amount of the electric energy meter through the control module.
  2. 2. The method of claim 1, wherein said adjusting the structure and parameters of the transformer comprises: Changing the magnetic core direction of the transformer to enable the direction of main magnetic force lines generated by the transformer to be in a non-perpendicular relation with the manganese-copper shunt.
  3. 3. The method of claim 1, wherein said adjusting the structure and parameters of the transformer comprises: a shield winding layer is disposed within the transformer that shields the primary winding and the secondary winding.
  4. 4. The method of claim 1, wherein said adjusting the structure and parameters of the transformer comprises: the number of turns of the primary winding of the transformer is increased to 1.1-1.2 times of the original number.
  5. 5. The method of claim 1, wherein said adjusting the structure and parameters of the manganese-copper shunt comprises: and increasing the resistance of the manganese-copper shunt to 1.15-1.25 times of the original resistance.
  6. 6. The method of claim 1, wherein said adjusting the structure and parameters of the manganese-copper shunt comprises: the length, width and height of the manganese-copper shunt are respectively changed, so that the area of the magnetic field generated by the transformer vertically passing through the manganese-copper shunt is reduced to 0.75-0.85 times of the original area.
  7. 7. The method of claim 1, wherein the metrology chip includes an analog-to-digital converter, and wherein the adjusting the parameters of the metrology chip includes: The gain of the analog current channel of the analog-to-digital converter is improved to 1.5 times of the original gain.
  8. 8. The voltage-influencing error-mitigation method of claim 1, wherein the metering chip comprises a meter parameter register, wherein the compensating calibration of the error change amount of the electrical energy meter by the control module comprises: Testing the electric energy meter under a plurality of preset different application conditions to obtain a plurality of corresponding error change amounts of the electric energy meter, wherein the application conditions comprise applied voltage and applied current; respectively converting each error change amount into a corresponding compensation parameter, and establishing an error parameter compensation table according to a plurality of different compensation parameters; When the electric energy meter operates, acquiring sampling voltage and sampling current of the electric energy meter, and judging whether the sampling voltage and the sampling current are in the preset application condition; If yes, inquiring the error parameter compensation table, acquiring the corresponding compensation parameter under the application condition, and writing the compensation parameter back into the meter correction parameter register to compensate the current error change amount of the electric energy meter.
  9. 9. An electric energy meter, comprising: The power supply module is used for supplying power to an internal circuit of the electric energy meter and comprises a transformer; The sampling module is connected with the power supply module and used for collecting voltage signals and current signals of the electric energy meter, and the sampling module comprises a manganese copper shunt; The metering module is respectively connected with the power supply module and the sampling module and is used for metering electric energy, and the metering module comprises a metering chip; The control module is respectively connected with the power supply module and the metering module and is used for controlling the power supply module and the metering module; the steps of the voltage-influencing error suppression method according to any one of claims 1 to 8 are performed while the electric energy meter is in a production and verification phase.
  10. 10. A readable storage medium having stored thereon a single chip microcomputer program, characterized in that the single chip microcomputer program when executed by a processor realizes the steps of the method according to any of claims 1 to 8.

Description

Voltage influence error suppression method, electric energy meter and storage medium Technical Field The invention relates to the technical field of electric energy metering, in particular to a voltage influence error suppression method, an electric energy meter and a storage medium. Background The intelligent electric energy meter is used as core equipment for electric energy measurement, and the measurement accuracy is important. The national standard and the international standard both put forward clear and strict limit requirements on the error change amount (namely voltage influence) of the electric energy meter, and the higher the precision level of the electric energy meter is, the smaller the allowable change amount is. In practical application, when the voltage of the power grid fluctuates, particularly when a voltage influence test is performed, the metering error of the electric energy meter can be changed obviously. Particularly, the intelligent electric energy meter using the power frequency transformer as the power supply has more obvious voltage influence. The method is characterized in that the higher the influence voltage is, the larger the magnetic field interference signal generated by the transformer is, and the larger the influence on the same current test point of the intelligent electric energy meter is. This interference has a relatively small effect on high current load points, but for low current load points, the relative effect of the interfering signal is greatly amplified due to the weak useful signal itself, often resulting in an error change at the test point approaching or exceeding the upper limit specified by the standard, making it difficult to meet higher-level or more stringent accuracy requirements. Therefore, how to control the voltage influence error within the high standard internal control and metering accuracy requirements for the small current load point is a problem to be solved in the art. Disclosure of Invention The invention provides a voltage influence error suppression method, an electric energy meter and a storage medium, which solve the problem that in the prior art, under the working condition of applying high voltage and small load current, the metering error of the electric energy meter is obviously increased due to magnetic leakage interference of a transformer. The technical scheme includes that the voltage influence error suppression method is applied to an electric energy meter, the electric energy meter comprises a power module, a sampling module, a metering module and a control module, the sampling module, the metering module and the control module are sequentially connected, the power module is respectively connected with the sampling module, the metering module and the control module, the power module comprises a transformer, the sampling module comprises a manganese-copper shunt, the metering module comprises a metering chip, the voltage influence error suppression method comprises the steps of respectively adjusting the structure and parameters of the transformer, the structure and parameters of the manganese-copper shunt and the parameters of the metering chip, and compensating and calibrating the error change amount of the electric energy meter through the control module. In some embodiments, adjusting the structure and parameters of the transformer includes changing the direction of the magnetic core of the transformer such that the direction of the main magnetic field lines generated by the transformer is in a non-perpendicular relationship with the manganese-copper shunt. In some embodiments, adjusting the structure and parameters of the transformer includes providing a shield winding layer within the transformer that shields the primary and secondary windings. In some embodiments, adjusting the structure and parameters of the transformer includes increasing the number of turns of the primary winding of the transformer to 1.1-1.2 times the original number. In some embodiments, adjusting the structure and parameters of the manganin shunt includes increasing the resistance of the manganin shunt to 1.15-1.25 times the original resistance. In some embodiments, adjusting the structure and parameters of the manganin shunt includes changing the length, width and height of the manganin shunt, respectively, so that the area of the magnetic field generated by the transformer vertically passing through the manganin shunt is reduced to 0.75-0.85 times of the original area. In some embodiments, the metering chip includes an analog-to-digital converter, and adjusting parameters of the metering chip includes increasing an analog current channel gain of the analog-to-digital converter by a factor of 1.5. In some embodiments, the metering chip comprises a meter correction parameter register, and the error change amount of the electric energy meter is compensated and calibrated through the control module, and the metering chip comprises the steps of respec