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Quick detection method of grid voltage fundamental wave positive sequence phase angle

A positive sequence technology of power grid voltage and fundamental wave, applied in the field of detection, can solve problems such as difficult to balance system stability and dynamic response speed, and achieve the effect of ensuring normal operation, fast dynamic response speed and high detection accuracy

Inactive Publication Date: 2012-10-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] Although people have made various improvements to the traditional detection methods, the existing grid voltage fundamental wave positive sequence component phase angle detection methods are difficult to take into account the contradiction between system stability and dynamic response speed, it is necessary to further explore

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  • Quick detection method of grid voltage fundamental wave positive sequence phase angle
  • Quick detection method of grid voltage fundamental wave positive sequence phase angle

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Embodiment Construction

[0028] When the present invention completes the rapid detection of the phase angle of the positive sequence component of the fundamental voltage, considering the generality of the grid voltage waveform distortion in engineering, the three-phase voltage u a , u b , u c They are:

[0029] ,

[0030] In the formula: U is the effective value of the voltage, the first subscript indicates the sequence component (1 is the positive sequence, 2 is the negative sequence, 0 is the zero sequence), and the second subscript indicates the harmonic order.

[0031] The frequency locking link of this article: put u a , u b , u c ,go through

[0032] ,

[0033] Transform to α-β coordinates, get:

[0034] ,

[0035] will u α The harmonic component is filtered by LPF, and the obtained signal is locked in phase and frequency by PLL to obtain a sine and cosine signal with the same frequency as the fundamental positive sequence voltage: and , which locks the fundamental frequency ...

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Abstract

The invention relates to a quick detection method of a grid voltage fundamental wave positive sequence phase angle, wherein the fundamental wave positive sequence voltage of a grid is obtained through two loops such as a frequency locking loop and a phase locking loop and a phase angle of fundamental wave voltage positive sequence component is extracted from a signal when the frequency of the grid voltage changes and the three-phase voltage is asymmetric or distorted. According to the quick detection method of the grid voltage fundamental wave positive sequence phase angle disclosed by the invention, when the frequency of the grid voltage is unstable and the waveform is distorted, the interference of harmonic component and fundamental wave negative sequence component is removed through the frequency locking loop and the phase locking loop, and the phase angle of grid voltage fundamental wave positive sequence component is exactly detected, thus the quick detection method disclosed by the invention not only has high detection precision, but also has quicker dynamic response speed, and can ensure the normal operation of various power electronic devices.

Description

technical field [0001] The invention relates to a method for quickly and accurately detecting the phase angle of the positive sequence component of the fundamental voltage when the voltage frequency of the grid is unstable and the waveform is distorted, and belongs to the detection technical field. Background technique [0002] When the power system is running, the system frequency will change with the change of the user load, so the fundamental frequency of the grid voltage is easily affected by the load and disturbed. With the wide application of power electronic devices, electrified railways and AC electric arc furnaces, the problems of harmonics and three-phase asymmetry in the power grid are becoming more and more serious. In engineering, the fundamental frequency disturbance, harmonics and three-phase asymmetry of the grid voltage will cause some devices that need to measure the phase angle of the grid voltage accurately in real time (such as the distribution network s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
Inventor 常鲜戎戴毅郑焕坤董正华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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