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Harmonic wave analysis method for electric energy quality harmonic wave analyzer

A harmonic analysis and power quality technology, applied in the field of high-precision harmonic analysis, can solve the problems of unreliability, short-range leakage, and low accuracy of analysis results, and achieve the effect of easy implementation and simple algorithm

Active Publication Date: 2014-08-06
内蒙古华测电力科技有限公司
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Problems solved by technology

[0007] In engineering applications, harmonic analysis always carries out limited point 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 for electric energy quality harmonic wave analyzer
  • Harmonic wave analysis method for electric energy quality harmonic wave analyzer

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Embodiment Construction

[0035] 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.

[0036] The harmonic analysis method of the power quality harmonic analyzer of the present invention comprises the following steps:

[0037]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 for an electric energy quality harmonic wave analyzer. The harmonic wave analysis method is improved and implemented on the basis of quasi-synchronous discrete Fourier transformation (DFT) and comprises the following steps of: sampling an electric signal X which is needed to be subjected to harmonic wave analysis in a power grid, and sampling (W+2) sampling point data at equal intervals; when the quasi-synchronous DFT for the harmonic wave analysis is applied, changing a frequency domain sampling position according to the drift mu of a signal frequency, wherein the frequency domain sampling position is mu2pi / N; and calculating the amplitude Pk=sqrt(a<k><2>+b<k><2>) and the initial phase angle phi<k>=tg<-1>(ak / bk) of each harmonic wave of the electric signal X, respectively calculating the amplitude percentages alpha=Pk / P1 *100% and the phase angle differences phi=phi<k> - phi<1> of amplitudes Pk and fundamental waves P1 of higher harmonic waves of a voltage signal V and a current signal I, outputting and displaying.

Description

technical field [0001] The invention relates to the technical field of harmonic analysis of power quality, in particular to a high-precision harmonic analysis method. Background technique [0002] 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. [0003] 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 electronics technology, many industrial enterprises have introduced a large number of impact loads, asymmetric loads and nonlinear loads, and harmonic pollution will inevitably occur when they are connected to the grid. Therefore, the harmonic analysis of the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16G01R19/25
Inventor 傅中君周根元
Owner 内蒙古华测电力科技有限公司
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