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Power grid harmonic detection method and power grid harmonic detection device

A harmonic detection and power grid technology, applied in the electric power field, can solve the problems of poor detection accuracy and achieve the effects of high harmonic detection accuracy, simple and fast calculation method, and low sampling requirements

Inactive Publication Date: 2017-12-22
BEIJING SMART CHINA ENERGY TECH DEV CO LTD
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Problems solved by technology

[0006] The present invention aims to provide a grid harmonic detection method and a grid harmonic detection device to solve the problem of poor detection accuracy in the grid harmonic detection method

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  • Power grid harmonic detection method and power grid harmonic detection device
  • Power grid harmonic detection method and power grid harmonic detection device
  • Power grid harmonic detection method and power grid harmonic detection device

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Embodiment Construction

[0028] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] figure 1 It is a schematic diagram of a power grid harmonic detection device according to an embodiment of the present invention. As shown in the figure, the power grid harmonic detection device according to an embodiment of the present invention includes: a data discrete module 11, which is used to obtain an analog signal of AC power in the power grid to be tested, And the analog signal is discretized to obtain discrete data x(t); the empirical mode decomposition module 13 is used to superimpose multiple groups of different Gaussian white noise signals ω on the basis of the discrete data x(t) i (t), get multiple sets of original signal X i (t), X i (t)=x(t)+ωi(t), and for multiple se...

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Abstract

The invention provides a grid harmonic detection method and a grid harmonic detection device. The grid harmonic detection method includes: step S11, obtaining an analog signal of AC power in the power grid to be tested, and performing discrete processing on the analog signal to obtain discrete data x(t); step S13, obtaining discrete data x(t) On the basis of superimposing multiple sets of different Gaussian white noise signals ωi(t), multiple sets of original signals Xi(t) are obtained, and multiple sets of original signals Xi(t) are subjected to empirical mode decomposition to obtain natural modes of each order function component; step S15, perform mean value operation on the intrinsic mode function components obtained by decomposing multiple groups of original signals Xi(t), and obtain the nth intrinsic mode function component cn(t); step S17, divide the nth intrinsic mode function The state function component cn(t) is substituted into a group of original signals X(t), and the harmonic decomposition result of the group X(t) is obtained. The calculation method of the invention is simple and quick, and the harmonic detection precision is high.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a grid harmonic detection method and a grid harmonic detection device. Background technique [0002] In recent years, due to the extensive use of nonlinear loads (such as rectifiers, frequency converters, etc.), power quality problems at the user side have become increasingly serious, among which harmonic pollution is the most serious. With the advancement of smart grid construction, various distributed power sources (such as small photovoltaic power generation, solar thermal power generation, small wind power generation), energy storage equipment (such as lithium battery packs, lead-acid battery packs, etc.) and electric vehicle charging stations, charging The piles began to appear, and these equipments were connected to the grid, which also brought a certain harmonic impact to the grid. [0003] The various impacts of harmonic pollution on the power grid are manifested in: reduci...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 白晓民董伟杰朱宁辉
Owner BEIJING SMART CHINA ENERGY TECH DEV CO LTD
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