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Method for extracting systematic frequency fluctuation signals

A frequency fluctuation and extraction system technology, applied in the direction of frequency measurement devices, can solve the problem of low sensitivity, achieve good adaptability, easy program implementation, and small amount of calculation

Inactive Publication Date: 2013-07-10
NR ELECTRIC CO LTD +2
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Problems solved by technology

The frequency calculated through the system voltage can truly reflect the power angle relationship between the main channel systems of the power grid under any power grid structure and operation mode, but its sensitivity is relatively low due to the limitation of signal processing methods

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  • Method for extracting systematic frequency fluctuation signals
  • Method for extracting systematic frequency fluctuation signals
  • Method for extracting systematic frequency fluctuation signals

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Embodiment Construction

[0019] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Cooperate figure 1 As shown, the present invention provides a method for extracting system frequency fluctuation signals, comprising the following steps:

[0021] (1) α-β transformation: through the real-time acquisition of the three-phase voltage of the system, the positive sequence voltage is calculated by using the "α-β transformation";

[0022] (2) Low-pass filtering: use a low-pass filter to perform low-pass filtering on the positive sequence voltage obtained in step (1);

[0023] (3) Frequency measurement: For the positive sequence voltage obtained in step (2), through the "frequency measurement" link, the zero-crossing method is used to calculate the frequency of the positive sequence voltage, and the frequency signal has a lot of noise;

[0024] (4) Filtering: Using a digital filter, use wavelet dec...

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Abstract

The invention discloses a method for extracting systematic frequency fluctuation signals. The method includes steps of calculating a positive sequence voltage in a real-time sampling mode, carrying out lowpass filtering on the positive sequence voltage; adopting a zero-passage method to calculate frequency of the filtered positive sequence voltage, and obtaining frequency signals with a large number of noises; and processing the obtained frequency signals through a digital filter, and obtaining smooth frequency fluctuation signals. The method can reduce a complex transfer function design step with a current / power as damping signals, greatly improves sensitivity with frequency as damping signals, and improves a damped oscillation function of a dynamic reactive power compensation device in a complex power grid.

Description

technical field [0001] The invention belongs to the field of power system signal processing, in particular to a method for extracting system frequency fluctuation signals. Background technique [0002] The dynamic reactive power compensation equipment with damping oscillation function is installed in the hub substation in the power grid. Using its rapid action, it can provide positive damping when the system oscillates, so as to accelerate the attenuation of the oscillation. With the complexity and scale of the power grid structure, the substation installed with dynamic reactive power compensation equipment may not necessarily be on the main channel of the system, and the operation mode and flow direction of the power grid are changing. Which signal to choose as the signal for damping oscillation The characteristic input signal directly determines the effect of damping oscillation. [0003] Input signals commonly used as damped oscillations include system frequency, line cu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
Inventor 李晓明孙强左尔玺朱岸明王中阳陈赤汉陈炜焦熠琨
Owner NR ELECTRIC CO LTD
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