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A DC electric energy metering device and method based on frequency spectrum analysis and synchronous sampling

A technology of frequency spectrum analysis and direct current energy, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of voltage and current value deviation, inability to distinguish ripples, etc., to improve accuracy, solve measurement errors, and enrich technical means Effect

Active Publication Date: 2020-11-03
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can get accurate results when the DC power is in a steady state, but the DC power is usually dynamic. When the DC power is dynamic, because the DC voltage and DC current may contain dynamic phenomena such as ripples, the sampled values ​​are directly related to each other. The DC power value obtained by multiplying is the sum of the full wave and ripple power, and it is impossible to distinguish whether the ripple is emitted or absorbed by the metered user, and there is a measurement error; secondly, if the sampling of the DC voltage and DC current is not synchronized, it will cause the power calculation to fail. Deviation of voltage and current values
Therefore, the conventional DC electric energy measurement method cannot meet the requirements, and it is necessary to design a dynamic DC electric energy calculation method

Method used

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  • A DC electric energy metering device and method based on frequency spectrum analysis and synchronous sampling
  • A DC electric energy metering device and method based on frequency spectrum analysis and synchronous sampling
  • A DC electric energy metering device and method based on frequency spectrum analysis and synchronous sampling

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Embodiment Construction

[0032] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0033] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a DC electric energy metering device and method based on spectrum analysis and synchronous sampling. The device comprises a DC voltage sampling module, a DC current sampling module, a frequency phase synchronization module, a frequency analysis module, a DC electric energy calculating module and a ripple electric energy calculating module, wherein the DC voltage sampling module is used for sampling DC voltage; the DC current sampling module is used for sampling DC current; the frequency phase synchronization module is used for enabling the sampling frequency and the phase of DC voltage sampling and DC current sampling to be the same; the frequency analysis module is used for using Fourier transform to process sampling signals; the DC electric energy calculating module is used for calculating DC electric energy; and the ripple electric energy calculating module is used for calculating ripple electric energy. In the method, phase and frequency synchronization for DC current sampling and DC voltage sampling is adjusted, the DC current and the DC voltage are sampled, and the DC electric energy is obtained after Fourier transform is carried out on the DC current sampling value and the DC voltage sampling value.

Description

technical field [0001] The present invention relates to the field of electric energy metering, more specifically, to a DC electric energy metering device and method based on frequency spectrum analysis and synchronous sampling. Background technique [0002] The application range of DC power is becoming more and more extensive. In applications such as off-board charging of electric vehicles and photovoltaic power generation, it is necessary to measure DC power. The conventional DC electric energy measurement method is to sample DC voltage and DC current separately, then multiply them directly, and integrate time. This method can get accurate results when the DC power is in a steady state, but the DC power is usually dynamic. When the DC power is dynamic, because the DC voltage and DC current may contain dynamic phenomena such as ripples, the sampled values ​​are directly related to each other. The DC power value obtained by multiplying is the sum of the full wave and ripple ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 卢达林繁涛杨静赵莎白静芬陈松方李华宋晓卉曾彦超白璋于春平
Owner CHINA ELECTRIC POWER RES INST
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