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Voltage flicker modulating wave detection method

A technology of voltage flicker and wave detection method is applied in the field of wave detection to achieve the effect of saving computing resources and simplifying computing steps

Inactive Publication Date: 2009-12-23
HEILONGJIANG UNIV +1
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Problems solved by technology

Traditional flicker modulation signal detection methods include square detection method, full-wave distillation method and effective value detection method, but they have some shortcomings in detection accuracy or digital implementation

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  • Voltage flicker modulating wave detection method
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  • Voltage flicker modulating wave detection method

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Embodiment Construction

[0015] In order to overcome the low detection accuracy of the existing wave detection method, the large amount of calculation, the long corresponding time, and the need to involve low-pass filters or band-pass filters, the algorithm is relatively complicated, and it is not suitable for application in digital measuring devices. problem, and then proposed a detection method of voltage flicker modulation wave.

[0016] Such as figure 1 As shown, the detection method of the voltage flicker modulation wave of the present invention comprises the following steps:

[0017] Step 101: Set the number of sampling points N and the sampling frequency f in a measurement period s , where N is a natural number;

[0018] Step 102: Obtain the voltage sampling value sequence u(n) (n=0, 1, 2, . . . , N-1) of the signal to be tested through the voltage sampling circuit;

[0019] Step 103: According to the formula y(n)=u(n)-u(n-1), obtain the sequence y(n) (n=0, 1, 2, . . . , N-1);

[0020] Step...

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Abstract

The invention provides a voltage flicker modulating wave detection method, which is characterized by comprising the following steps of: setting the number of sampling points within a measurement period as N and sampling frequency as fs, wherein N is a natural number; by a voltage sampling circuit, obtaining a voltage sampling value sequence of a signal to be tested, namely u(n)(n equals to 0, 1, 2, ..., N minus 1); according to a formula, namely y(n) equals to the difference between x(n) and x(x minus 1), obtaining a sequence y(n)(n equals to 0, 1, 2, ..., N minus 1); according to a formula, namely Phi(u (n)) equals to the difference between u(n) and u(n minus 1)*u(n plus 1), obtaining a sequence Phi(u (n))(n equals to 0, 1 , 2, ..., N minus1); according to y(n), utilizing the formula, namely Phi(y (n)) equals to the difference between y(n) and y(n minus 1)*y(n plus 1), and obtaining a sequence Phi(y (n))(n equals to 0, 1, 2, ..., N minus1); utilizing a formula, namely G(n) equals to the ratio of 1 minus Phi(y(n)) to 2Phi(u(n)) to calculate a sequence G(n)(n equals to 0, 1 ,2, ..., N minus 1); and utilizing a formula, namely a(n) equals to the ratio of Phi(u(n)) to 1 minus G2*(n), to obtain a sequence a(n)(n equals to 0, 1 , 2, ..., N minus 1), wherein a(n) is fluctuation parts in voltage flicker signals. The detection method can quickly accurately extract the fluctuation parts in the voltage flicker signals, and is characterized by a small amount of calculation, high testing accuracy and fast corresponding speed.

Description

technical field [0001] The invention relates to a wave detection method, in particular to a wave detection method for voltage flicker modulation waves. Background technique [0002] Voltage fluctuation and flicker are one of the important indicators of power quality. Voltage fluctuation and flicker in the power supply system will hinder the normal power consumption of other power users and constitute a power public hazard. The primary task of flicker measurement is to accurately extract the fluctuation signal, that is, voltage flicker detection. Generally, the fluctuating voltage is regarded as an amplitude modulation wave with the rated power frequency voltage as the carrier, and its voltage amplitude is modulated by the voltage fluctuation component with a frequency range of 0.05HZ-35HZ. The detection of voltage flicker can be attributed to the demodulation of the instantaneous voltage signal The process of producing the amplitude modulation wave. Traditional flicker mod...

Claims

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Application Information

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IPC IPC(8): G01R19/25
Inventor 张东中佟为明李辰袁帅金显吉高洪伟李凤阁
Owner HEILONGJIANG UNIV
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