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Harmonic wave analysis method of power-quality harmonic wave analyzer

A technology of harmonic analysis and power quality, applied in the field of high-precision harmonic analysis, it can solve the problems of low accuracy of analysis results, difficulty in synchronizing sampling for harmonic analysis, long-range leakage, etc.

Inactive Publication Date: 2014-02-26
蒋春花
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Problems solved by technology

[0008] In engineering applications, harmonic analysis always performs limited sampling and it is difficult to achieve strict synchronous sampling
In this way, when quasi-synchronous DFT is used for harmonic analysis, there will be long-range leakage due to the truncation effect and short-range leakage due to the fence effect, making the analysis results inaccurate and even unreliable

Method used

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  • Harmonic wave analysis method of power-quality harmonic wave analyzer
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  • Harmonic wave analysis method of power-quality harmonic wave analyzer

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Embodiment Construction

[0036] The power quality harmonic analyzer is mainly composed of sensors, signal conditioning circuits, data acquisition circuits, CPU, LCD unit and corresponding analysis software. The sensor generally uses a voltage transformer and a current transformer to convert the high voltage and high current signals of the measured power grid in a certain proportion; the signal conditioning circuit converts the voltage and current signals sent by the sensor into voltage signals suitable for data acquisition circuit sampling ; The conditioned signal is sampled by the data acquisition circuit, and then the analysis and detection of the harmonics is completed by the CPU through the analysis software.

[0037] The harmonic analysis method of the power quality harmonic analyzer of the present invention comprises the following steps:

[0038]First, the CPU unit samples the electrical signal X that requires harmonic analysis in the power grid, and samples W+2 sampling points at equal interval...

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Abstract

The invention discloses a harmonic wave analysis method of a power-quality harmonic wave analyzer, wherein the method is improved and realized based on a quasi-synchronization DFT. The harmonic wave analysis method comprises the following steps that an electric signal X on which harmonic wave analysis needs to be performed in a power grid is sampled and W+2 sampling point data is sampled in an equally-spaced mode; when the quasi-synchronization DFT is used to carry out the harmonic wave analysis, a position of frequency domain sampling is changed according to drifting of a signal frequency mu, wherein the frequency domain sampling position satisfies a formula 1. Each harmonic wave amplitude and an initial phase angle of the electric signal X are calculated. And then an amplitude percentage of a higher harmonic wave amplitude Pk and a fundamental wave P1 and a phase angle difference of a voltage signal V and a current signal I are calculated respectively, output and displayed.

Description

[0001] This application is a divisional application, the application number of the original application: 201110322629.4, the title of invention: a harmonic analysis method for a power quality harmonic analyzer, and the application date: 2011-10-21. technical field [0002] The invention relates to the technical field of harmonic analysis of power quality, in particular to a high-precision harmonic analysis method. Background technique [0003] Harmonic analysis technology is widely used in many fields such as power quality monitoring, electronic product production inspection, and electrical equipment monitoring. It is an important technical means for power grid monitoring, quality inspection, and equipment monitoring. [0004] In the power supply network, the generation of harmonic phenomena is mainly caused by large-capacity power equipment, power rectification or converter equipment, and other nonlinear loads. In recent years, with the rapid development of power electronic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 不公告发明人
Owner 蒋春花
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