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Method and device for detecting voltage fluctuation and flicker based on energy operator and spectrum correction

An energy operator and voltage fluctuation technology, which is applied in the direction of measurement, spectrum analysis/Fourier analysis, etc. using digital measurement technology. question

Inactive Publication Date: 2013-05-22
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a voltage fluctuation and flicker detection method and device based on energy operator and spectrum correction. Accurately Obtaining Spectrum Components and Fluctuating Amplitudes of Flicker Voltage Signals

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  • Method and device for detecting voltage fluctuation and flicker based on energy operator and spectrum correction
  • Method and device for detecting voltage fluctuation and flicker based on energy operator and spectrum correction

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Embodiment Construction

[0082] The present invention will be further described below in conjunction with accompanying drawing.

[0083] This embodiment is a flicker parameter detection part of a flicker unit board that can be used to implement a power system voltage fluctuation and flicker detection device and a power quality monitoring device.

[0084] It is set that the ADC in this embodiment selects the 16-bit high-speed 8-channel synchronous sampling chip ADS1178, and the DSP processor selects the TMS320VC6745, and the main parameters are selected as follows:

[0085] (1) Sampling rate: f s =52k;

[0086] (2) Power grid fundamental frequency: fluctuates around 50Hz;

[0087] (3) FFT operation data length: N=512;

[0088] (4) Flicker signal detection frequency range: 0.05~35Hz.

[0089] like figure 1 As shown, it is a flow chart of voltage flicker parameter detection and flicker value calculation of the present invention, and the specific steps are as follows:

[0090] Step 1: Set a fixed sa...

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Abstract

The invention discloses a method and device for detecting voltage fluctuation and flicker based on an energy operator and spectrum correction. The method comprises the steps of: extracting an envelope signal of a voltage flicker signal by utilizing a Teager-Kaiser energy operator, and speeding up an operational speed to overcome influences from change of parameters such as a signal frequency, a waveform, an amplitude value and a sampled data length during the extraction of the flicker envelope signal and realize rapid and real-time detection of the flicker signal; and performing improved FFT (Fast Fourier Transform) spectrum correction analysis on the voltage flicker signal by adopting a Kaiser window function with a freely selectable proportion of a width of a main lobe to a height of a side lobe, and exactly obtaining the frequency and the amplitude component of the voltage flicker signal when the frequency, the waveform and the amplitude value of the flicker signal are changed excessively. The device based on the method comprises a signal conditioning unit, a data processing unit and a data storage and display unit all of which are connected in order. The detecting method is convenient for rapid and in-time detection process of the signal; and the device has a simple structure and is easy to realize.

Description

technical field [0001] The invention relates to a voltage fluctuation and flicker detection method and device based on energy operators and spectrum correction. Background technique [0002] The sharp increase of power load, especially the impact load, constitutes a serious pollution to the power system, resulting in unstable grid voltage, voltage fluctuations and flickering, increasing the instability of the grid, and causing serious damage to industrial production and social life. influences. Voltage flicker is an important parameter of power quality and an important cause of failure and failure of power supply and consumption equipment. Accurate measurement of voltage flicker in power supply and consumption systems can provide scientific basis for studying the source of flicker, suppressing and eliminating the impact of voltage fluctuation and flicker, etc. [0003] The detection of voltage fluctuation and flicker is based on the IEC standard at home and abroad, using t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R23/16
Inventor 高云鹏李峰滕召胜姚文轩曹一家左培丽
Owner HUNAN UNIV
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