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A Harmonic Analysis Method for Power Quality

A harmonic analysis and power quality technology, applied in the field of high-precision harmonic analysis, can solve problems such as untrustworthiness, short-range leakage, and difficulty in synchronous sampling for harmonic analysis, and achieve the effect of simple algorithm and easy implementation

Active Publication Date: 2016-10-19
HUNAN SENNENG ELECTRIC POWER TECH
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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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  • A Harmonic Analysis Method for Power Quality
  • A Harmonic Analysis Method for Power Quality

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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 power quality harmonic analysis method which is realized through improvement on the basis of quasi-synchronous DFT (discrete fourier transform). The harmonic analysis method comprises the following steps: sampling an electrical signal X needing harmonic analysis in a power grid, and sampling the data of W+2 sampling points at an equal interval; changing the sampling position of a frequency domain according to the drift micron of signal frequency when the quasi-synchronous DFT is applied to harmonic analysis, namely the sampling position of the frequency domain as a micron2pai / N; calculating the amplitude and initial phase angle of harmonic waves of the electric signal X; and finally, respectively calculating the percentage of amplitude P<k> and amplitude of first harmonic P1, and phase angle difference of higher harmonic and first harmonic P1 of a voltage signal V and a current signal I, and outputting and displaying.

Description

[0001] This application is a divisional application of the invention patent application with the application number: 201110322629.4, the invention name is "A Harmonic Analysis Method for Power Quality Harmonic Analyzer", and the application date is: October 21, 2011. 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 ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 傅中君周根元
Owner HUNAN SENNENG ELECTRIC POWER TECH
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