Method and device for testing influence of temperature and alternating current interference on direct current electric energy measurement error

Abstract

The invention discloses a method and device for testing the influence of temperature and alternating current interference on direct current electric energy measurement error. The method comprises steps of S01, carrying out the initial inherent error test of a detected direct current electric energy meter, and obtaining the initial inherent error values at different load points; S02, testing a first direct-current electric energy metering error of the detected direct-current electric energy meter at different load points and different temperature values, and calculating to obtain a first direct-current electric energy metering error offset; S03, connecting the direct current signal containing the alternating current interference to the detected direct current electric energy meter, testing a second direct current electric energy metering error at different load points and under different alternating current interferences, and calculating to obtain a second direct current electric energy metering error offset; and S04, according to the initial inherent error value, the first direct-current electric energy metering error offset and the second direct-current electric energy metering error offset, obtaining a final comprehensive evaluation quantity. The method has advantages of being simple in implementation method, low in cost, high in efficiency and precision and the like.

Description

technical field [0001] The invention relates to the technical field of direct current electric energy measurement, in particular to a method and a device for testing the influence of temperature and alternating current interference on direct current electric energy measurement errors. Background technique [0002] DC energy meters are widely used in various scenarios. For example, a considerable part of electric vehicle charging facilities are DC power supply equipment, and DC energy meters are the core of energy measurement in DC chargers. Regulations and standards for DC electric energy measurement are also given in standards such as GB / T 33708-2017 static DC electric energy meter and JJG842-2018 DC electric energy meter verification regulations. There are many types of energy meters, and the measurement functions they have are different. For example, some energy meters can output DC voltage and DC current, but they cannot measure DC energy and cannot be used for the verif...

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Problems solved by technology

Using the measurement error test method of the above-mentioned DC electric energy meter, only the error size of the DC electric energy meter in a single environment can be obtained, so the DC electric energy meter can only be adjusted to meet the standard conditions in a single environment, and the operating environment of the DC electric energy meter With the complexity of the operating environment of the DC electric energy meter, the actual operating conditions of the DC electric energy meter are often affected by multiple influence quantities, that is, under the condition of dynamic change, so the above is based solely on a single influence quantity The error testing method of the DC electric energy meter cannot meet the current accuracy requirements of the DC electric energy meter

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