A Novel Comb Filter Based Real-Time Subharmonic Detection Method

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

Active Publication Date: 2020-12-01
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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  • A Novel Comb Filter Based Real-Time Subharmonic Detection Method
  • A Novel Comb Filter Based Real-Time Subharmonic Detection Method
  • A Novel Comb Filter Based Real-Time Subharmonic Detection Method

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[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 novel comb filter real-time sub-harmonic detection method, by making the output of each second-order integrator a pair of orthogonal signals, thereby measuring the amplitude signal of each single harmonic; In the specific process, adding the output of each second-order integrator and subtracting the input of the system can eliminate the influence of other harmonics and ensure the steady-state accuracy of the system; this eliminates the traditional The redundant decoupling links of the multiple second-order generalized integrators of the device reduce the calculation burden and increase the system response speed.

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 Patents(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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