A method of electric energy metering under the background of interharmonic

A technology of electric energy measurement and harmonics, which is applied in the direction of measuring electric variables, measuring devices, instruments, etc., can solve the problems of harmonic and interharmonic pollution of nonlinear load users, and achieve the suppression of spectrum leakage, high measurement accuracy, and synchronization Good performance and real-time performance

Active Publication Date: 2019-12-13
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

Later, some enterprises tried to adopt the fundamental wave electric energy measurement method. Although it can avoid the linear load users from bearing additional electric power charges for harmonic and inter-harmonic active energy, the harmonic and inter-harmonic pollution behavior of non-linear load users has not been dealt with accordingly. Measuring and punishing

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  • A method of electric energy metering under the background of interharmonic
  • A method of electric energy metering under the background of interharmonic
  • A method of electric energy metering under the background of interharmonic

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the electric energy metering method of the present invention specifically includes the following steps:

[0024] Step 1: Synchronously sample the grid voltage and current signals connected to the target user;

[0025] Step 2: performing average filtering on the voltage and current sampling signals in the step 1 to obtain DC signals of voltage and current, and subtracting and separating the original signal from the DC signal to obtain AC signals of voltage and current;

[0026] Step 3: According to the known AC signal fundamental frequency ω 0 , performing narrowband bandpass filtering on the voltage AC signal obtained in step 2 to obtain a voltage fundamental wave signal;

[0027] Step 4: Using the fundamental frequency EPLL to extract the fundamental frequency ω of the voltage and current signals from the fundamental volt...

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Abstract

The invention provides an electric energy metering method used under an inter-harmonics background. The electric energy metering method comprises the steps of synchronously sampling a voltage signal and a current signal of a power grid, performing AC-DC separation on the voltage and current sampling signals respectively to obtain AC and DC signals, and performing electric energy metering based onthe separated AC and DC signals. The electric energy metering method can be used for metering DC electric energy, fundamental wave electric energy, harmonics electric energy and inter-harmonics electric energy respectively, so as to guide a power grid department to perform corresponding electricity fee allocation on users according to actual injection of consumption of power harmonics and inter-harmonics, and guide the users to take measures to improve the electric energy utilization rate.

Description

technical field [0001] The invention relates to an electric energy measurement method, in particular to an electric energy measurement method used in the background of interharmonic waves. Background technique [0002] In the current smart grid environment, more and more power electronic devices, fluctuating power sources, and fluctuating loads are widely used in power systems, and the resulting harmonic and interharmonic problems have become increasingly prominent. For power grids with serious harmonic and inter-harmonic pollution, in order to accurately measure the electric energy actually consumed by the corresponding load and reduce the error of electric energy measurement, it is necessary to increase the electric energy generated by taking into account harmonics and inter-harmonics on the basis of traditional electric energy measurement methods. Loss, to clarify the harmonic and inter-harmonic pollution responsibilities between the grid and users, or between different u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 王建勋耿攀余定峰徐林左超雷秉霖欧阳晖汪永茂吴大立孙朝晖徐正喜陈涛魏华罗伟李文华谢炜姜波吴浩伟蔡凯明海涛杜兆伟
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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