Real-time sub-harmonic detection method of novel comb filter

A technology of comb filtering and sub-harmonic, applied in the field of real-time sub-harmonic detection of new type comb filtering, can solve the problem that the harmonic amplitude signal cannot be calculated, is not suitable for fast detection of harmonic sub-harmonics, and has a large amount of calculation. and other problems, to achieve the effect of reducing the computational burden, low steady-state error, and small amount of calculation

Active Publication Date: 2019-01-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This method has high detection accuracy, but the amount of calculation is large, it cannot calculate the harmonic amplitude signal, and it is not suitable for the rapid detection of harmonics.

Method used

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  • Real-time sub-harmonic detection method of novel comb filter
  • Real-time sub-harmonic detection method of novel comb filter
  • Real-time sub-harmonic detection method of novel comb filter

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Embodiment

[0030] figure 1 It is a system block diagram of a novel comb filter real-time fractional harmonic detection method of the present invention.

[0031] In this example, if figure 1 As shown, the real-time fractional harmonic detection method of a novel comb filter of the present invention comprises the following steps:

[0032] S1. Subtracting the measured signal v(z) from the total harmonic output signal v(z)' of the previous beat comb filter to obtain an error signal e(z), where z represents a Z domain operator;

[0033] S2, the error signal e (z) and the integral gain K of each second-order generalized integrator In The product of is respectively used as the first input signal of each second-order generalized integrator in parallel in the comb filter, wherein, n=1,2,...,h, h is the number of second-order generalized integrators;

[0034] S3, will (nω) 2 As the second input signal of the second-order generalized integrator, ω is the fundamental frequency; the second input ...

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Abstract

The invention discloses a real-time sub-harmonic detection method of a novel comb filter. Output of each second-order integrator is a pair of orthogonal signals; therefore, the amplitude signal of each single harmonic is measured; in a specific process, outputs of various second-order integrators are added, and subtracted by the input of the system; therefore, influence of other harmonics can be eliminated; the steady precision of the system is ensured; therefore, the redundant decoupling link of the traditional multiple second-order generalized integrator based on a band-pass filter is eliminated; the calculation burden is reduced; and the system response speed is increased.

Description

technical field [0001] The invention belongs to the technical field of current harmonic control of an active power filter, and more specifically relates to a real-time fractional harmonic detection method of a novel comb filter. Background technique [0002] With the development of power electronics technology, the application of nonlinear loads has led to the problem of harmonic pollution in the power grid, because the rapid extraction of specified sub-harmonics plays an important role in power quality assessment, grid synchronization and harmonic compensation, so in order to solve the increasingly serious Various methods for detecting and extracting harmonics have been proposed one after another. These methods are generally divided into time-domain methods and frequency-domain methods. [0003] The frequency domain method is usually a method based on Fourier transform. The discrete Fourier transform transforms the time domain signal into a frequency domain signal. These f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 谢川薛程阔李凯邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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