Method for diagnosing metering fault of electric energy meter in limited range based on high-frequency current sampling

Abstract

The invention discloses a method for diagnosing a metering fault of an electric energy meter in a limited range based on high-frequency current sampling, relates to the technical field of electric energy metering, and solves the problem that the electric energy meter error estimation precision or hit rate is seriously limited by loss estimation precision in the prior art. According to the technical scheme, the method comprises the following steps of: collecting current instantaneous values of a general meter and branch meters; obtaining a total sample space after multiple times of acquisition; establishing a coefficient matrix and an augmented matrix, and judging whether the ranks of the coefficient matrix and the augmented matrix are equal or not; if the collected data is invalid, collecting at least one group of data again, and discharging the same group number of data to obtain a new overall sample space until the ranks of the coefficient matrix and the augmented matrix are equal; and establishing an error calculation model, solving the error calculation model, and comparing the result with a precision grade threshold of the electric energy meter to obtain a fault diagnosis result. Accurate calculation of the error of an electric energy meter in operation can be realized, the electric energy meter error estimation precision and hit rate can be effectively improved, and human factor interference can be effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of electric energy metering, more specifically, it relates to a method for diagnosing metering faults in a limited range of electric energy meters based on high-frequency current sampling. Background technique [0002] With the continuous advancement of the global energy transformation process, especially the proposal of carbon neutrality and carbon peaking, efficient energy technology will be an important development direction for a long time in the future. As an important equipment for trade settlement between customers and power companies, Energy meters will play a more important role. Therefore, how to ensure that the quality of the electric energy meter is always in a good state has become an urgent problem to be solved in front of the power company and the quality management department. [0003] In view of this, it was proposed that based on the principle of energy conservation, by collecting the elec...

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Problems solved by technology

[0005] In order to solve the problem that the error estimation accuracy or hit rate of electric energy meters in the prior art is severely limited by the loss estimation accuracy, the purpose of the present invention is to provide a method for diagnosing electric energy meter measurement faults within a limited range based on high-frequency current sampling, calculation models and actual The application is highly consistent, and there is no line loss problem, which can effectively improve the error estimation accuracy and hit rate of the electric energy meter

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