Base wave and harmonic detecting method based on Kaiser window double-line spectrum insert value FFT

A bispectral line interpolation and harmonic technology, applied in the field of signal processing, can solve problems such as unrelated processing methods, difficulty in fundamental wave and harmonic measurement and analysis, and spectrum leakage
CN101441233AInactive Publication Date: 2009-05-27湖南海兴电器有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
湖南海兴电器有限责任公司
Publication Date
2009-05-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a fundamental wave based on Kaiser Window bispectrum line interpolation FFT (Fast Fourier Transform) and a harmonic wave detection method. The method comprises the following steps: analog-to-digital conversion and low-pass filtration treatment is conducted on the signal to be detected; the Kaiser Window with free proportion selection between the attenuation of a main lobe and side lobes, flexible design realization, low side lobe level and quick attenuation speed is adopted to conduct windowing FFT operation on the signal; and bispectrum line interpolation algorithm is used for detecting base wave and harmonic quantities of the detected signal. The following aspects are included: (1) analog-to-digital conversion and low-pass filtration; (2) the FFT operation based on the Kaiser Window; (3) base wave and harmonic wave parameters derived by bispectrum line interpolation and polynomial fitting.
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Description

technical field

[0001] The invention relates to a method for detecting fundamental wave and harmonic parameters in signals. Specifically, it is a fundamental wave and harmonic parameter detection method based on Kaiser window bispectral interpolation FFT (fast Fourier transform), which belongs to the technical field of signal processing and can also be used for spectrum analysis of other signals. Background technique

[0002] Taking power signal detection as an example, with the development of power electronics technology, non-linear devices are widely used in power systems, and the harmonic problems brought by non-linear devices pose an increasingly serious threat to the safety, stability and economic operation of power systems. Accurate measurement of fundamental and harmonics can provide scientific basis for power grid energy metering, harmonic power flow calculation, equipment network detection, power system harmonic compensation and suppression, etc.

[0003] Fundament...

Claims

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