Electric energy metrical pulse generation method for ammeter

Abstract

The invention relates to a generating method used in electric energy gage impulse in the field of electric power parameter measuring technology. It first dose zero point detecting to the voltage signal and the detecting result is used to control the computing of the period energy and the current time power increment; when detecting a new zero point, it adds the front period energy in the electric rest energy to compute the period average power so as to linear forecast the current period current time electric rest energy; when the electric rest energy is over an electric energy gage impulse corresponding electric energy, it outputs an electric energy gage impulse and takes out a electric energy gage impulse corresponding electric energy value from the electric rest energy at the same time.

Description

technical field [0001] The invention relates to a method for generating electric energy metering pulses for electric meters, and belongs to the technical field of electric parameter measurement. Background technique [0002] The commonly used electronic energy metering process can be described as: [0003] 1. Perform analog-to-digital conversion on the voltage signal v(t) and current signal i(t) from the power line through an analog-to-digital converter, and obtain the corresponding digital results v(j) and i(j); [0004] 2. Multiply v(j) and i(j) to get the instantaneous power p(j); [0005] 3. Convert the instantaneous power sequence p(j) obtained in the above step 2) into a pulse signal with a certain frequency for output through a conversion method from a certain power to an electric energy metering pulse. [0006] The pulse signal output in the above step 3 is used for the calibration of the electric meter and the measurement of electric energy (such as directly drivi...

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Problems solved by technology

Obviously, in order to improve the uniformity of the output pulse, it is necessary to improve the low-pass filtering effect, that is, reduce the bandwidth of the filter and increase the order of the filter. However, the low bandwidth of the filter will cause the output power to change when the actual load power changes The response of the metering pulse changes with the slow, high filter order will increase the amount of calculation, or the cost of the circuit in hardware implementation will become larger, these two are the problems existing in the existing method of electric energy metering pulse generation

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