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Power signal harmonic analysis method and device

A harmonic analysis and power signal technology, which is applied in the field of power signal harmonic analysis methods and devices, can solve problems such as increased calculation amount, high frequency multiplication, and increased difficulty of circuit design, achieving accurate calculation and reducing calculation amount.

Inactive Publication Date: 2014-02-19
北京富根电气有限公司
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Problems solved by technology

[0004] Phase-locked loops require synchronization of power signals, which may involve extremely high frequency multiplication, which increases the difficulty of circuit design
[0005] FFT transform calculates all harmonic values, but actually only needs to measure some of them, which virtually increases the amount of calculation

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  • Power signal harmonic analysis method and device
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  • Power signal harmonic analysis method and device

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Embodiment Construction

[0032] The invention discloses a power signal harmonic analysis method and device, which are characterized in that a unique sampling synchronization method is adopted, and only interested harmonics are calculated by using a DFT method.

[0033] The sampling point used for harmonic analysis needs to be at the same frequency and phase as the power signal, that is, the synchronous sampling signal. The present invention first measures the frequency, and then starts sampling at the beginning point of the cycle to meet the above requirements.

[0034] To measure the period of the power frequency signal, use a high-frequency counting clock to start counting at the zero-crossing point of the power frequency signal. After multiple zero-crossing cycles, such as 100 and 1000 cycles, the total count value is obtained, and then divided by The number of cycles can be used to obtain the average count value of a power frequency signal, and the counting clock is relatively accurate, so that a m...

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Abstract

The invention discloses a power signal harmonic analysis method which comprises the steps of (1) selecting a phase voltage or a phase current, utilizing a high-frequency counting clock for counting power frequency signals, obtaining a total counting value through a plurality of periods, dividing the total counting value by the number of the periods to obtain the average counting value of the power frequency signals, (2) determining the counting step length of the sampling periods as time intervals of the sampling periods, (3) obtaining an initial point of the power frequency signals through circuit detection, (4) conducting the Fourier conversion in the DFT mode, and only calculating the amplitude and the phase angle of an interested harmonic component.

Description

technical field [0001] The invention relates to a power signal processing method, in particular to a power signal harmonic analysis method and device. Background technique [0002] In the prior art, there are generally two ways to analyze the harmonics of the power signal: 1. Synchronous sampling and analysis of the phase-locked loop; 2. Interpolation analysis with windowing. [0003] In the above two methods, a signal sequence is obtained by collecting synchronous signals, or by window interpolation, and then performing FFT transformation to obtain each harmonic component. [0004] The phase-locked loop requires synchronization of the power signal, which may involve extremely high frequency multiplication, which increases the difficulty of circuit design. [0005] The FFT transform calculates all the harmonic values, but in fact only needs to measure some of them, which virtually increases the amount of calculation. [0006] Therefore, it is an urgent problem to be solved...

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Application Information

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IPC IPC(8): G01R23/16
Inventor 周斌张志忠解峥崔杨
Owner 北京富根电气有限公司