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Method and device for processing signals

A technology for processing signals and signals, applied in the field of signal processing, can solve problems such as simple harmonic detection of power grids, and achieve the effect of improving real-time performance

Inactive Publication Date: 2016-02-17
SHENZHEN HIETECH ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to propose a method and device for processing signals, aiming to solve the problem of how to accurately and quickly detect the simple harmonics of the power grid

Method used

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  • Method and device for processing signals
  • Method and device for processing signals
  • Method and device for processing signals

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Experimental program
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Effect test

Embodiment 1

[0053] refer to figure 1 , figure 1 It is a schematic flowchart of the first embodiment of the method for processing signals according to the embodiment of the present invention.

[0054] In Embodiment 1, the method for processing a signal includes:

[0055] Step 101, collecting grid signals, and performing real-time single-period DFT analysis on the discrete signals of each period of the grid signal, to obtain the frequency band of simple harmonics in the grid signal;

[0056] Preferably, the collecting grid signal includes:

[0057]

[0058] Among them, f s is the collection frequency, M is the number of collection components, f i , A i , is the frequency, amplitude and phase of the collected components, and N is the number of points collected for each cycle.

[0059] Preferably, performing real-time single-period DFT analysis on the discrete signals of each period of the power grid signal to obtain the frequency band of simple harmonics in the power grid signal, ...

Embodiment 2

[0077] refer to figure 2 , figure 2 It is a schematic flowchart of the second embodiment of the method for processing signals according to the embodiment of the present invention.

[0078] Step 201, collecting grid signals, and performing real-time single-period DFT analysis on the discrete signals of each cycle of the grid signal, to obtain the frequency band of simple harmonics in the grid signal;

[0079] Specifically, the power grid signal is sampled, and the sampling value is x 0 (n)

[0080]

[0081] Among them, f s is the sampling frequency, M is the number of sampling components, f i ,A i , is the frequency, amplitude and phase of the sampling component, and N is the number of sampling points per cycle.

[0082] Perform real-time single-period DFT analysis on the discrete signal of each period, and display the results. At this time, it is not necessary to analyze the inter-harmonics to obtain more accurate results. If inter-harmonics appear, it will be obs...

Embodiment 3

[0109] refer to image 3 , image 3 is a schematic diagram of functional modules of the device for processing signals according to the embodiment of the present invention.

[0110] In Embodiment 3, the device for processing signals includes:

[0111] A first collection module 301, configured to collect power grid signals;

[0112] Preferably, the first acquisition module 301 is configured to:

[0113]

[0114] Among them, f s is the collection frequency, M is the number of collection components, f i , A i , is the frequency, amplitude and phase of the collected components, and N is the number of points collected for each cycle.

[0115] The first acquisition module 302 is configured to perform real-time single-period DFT analysis on discrete signals of each period of the grid signal, and acquire frequency bands of simple harmonics in the grid signal;

[0116] Preferably, the first acquisition module 302 is configured to:

[0117] Perform real-time single-period DF...

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Abstract

The embodiment of the invention discloses a method and a device for processing signals. The method comprises the following steps: collecting power grid signals, and carrying out real-time single-period DFT analysis on discrete signals of each period of the power grid signals, so as to acquire frequency bands of simple harmonic waves in the power grid signals; carrying out multiple modulation and recollection on the power grid signals according to the frequency bands of the simple harmonic waves in the power grid signals; acquiring recollected frequency spectrum information after the DFT conversion. According to the method, inter-harmonics of a power grid can be accurately and rapidly detected, so that the detection instantaneity of the inter-harmonics is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of signal processing, and in particular, to a method and device for processing signals. Background technique [0002] The main sources of intermediate harmonics in the power system are frequency conversion adjustment devices in the power grid, low synchronous cascade speed regulation, fluctuating power loads such as electric arc furnaces, iron core equipment such as induction motors, and ferromagnetic oscillations in the distribution network. Interharmonics and fundamental waves are transformed asynchronously, which will lead to changes in the amplitude of the positive and negative half waves of the waveform and the offset of the zero crossing point, which will cause errors in sampling data or digital relays working at zero crossing, and even cause accidents due to misoperation. [0003] In order to accurately measure inter-harmonics, IEC has formulated a special inter-harmonic detectio...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 何玉成高明霞刘兵陈国辉李斌唐成曾智尹家伟
Owner SHENZHEN HIETECH ENERGY TECH