Adaptive Algorithm for Frequency and Amplitude of Transient Electric Signal

An adaptive algorithm and electrical signal technology, applied in frequency measurement devices, complex mathematical operations, AC/pulse peak measurement, etc., can solve problems such as inability to achieve effective tracking and reduced calculation accuracy, and achieve fast and accurate synchronous adaptive tracking, The effect of high algorithm accuracy and effective technical support

Active Publication Date: 2021-02-19
LIUAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER +1
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Problems solved by technology

However, the above algorithms are all based on the standard sinusoidal signal with constant amplitude. When the amplitude changes greatly, the calculation accuracy will be significantly reduced, and it is impossible to achieve effective tracking in the case of synchronous time-varying frequency and amplitude.

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  • Adaptive Algorithm for Frequency and Amplitude of Transient Electric Signal
  • Adaptive Algorithm for Frequency and Amplitude of Transient Electric Signal
  • Adaptive Algorithm for Frequency and Amplitude of Transient Electric Signal

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Embodiment Construction

[0054]The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so that the protection scope of the present invention can be more clearly defined.

[0055]Seefigure 1 , The embodiment of the present invention includes:

[0056]An adaptive algorithm for frequency and amplitude of transient electrical signals, including the following steps:

[0057]S1: The power system signal x(t) is installed in front of the AD sampling module, and an anti-aliasing analog filter is installed to minimize the leakage of the sampling signal spectrum, and the sampling frequency is fs(Unit: Hz), sampling duration is ts(Unit: s) Sampling the power system signal x(t) (unit: V or A) to obtain N points of discrete electrical signals x(n), where N=fs*ts, The sampling interval is Ts=1 / fs;

[0058]S2: Establish a cubic spline interpo...

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Abstract

The invention discloses a frequency and amplitude self-adaptive algorithm of a transient electric signal, comprising the following steps: performing cubic spline interpolation on the sampled electric signal in the time domain, and performing data truncation according to the sampling interval after obtaining the interpolation sequence, Construct the reconstructed samples, and finally use the Prony algorithm to estimate the frequency amplitude of each reconstructed sample. The experimental results verify that the algorithm quickly and accurately realizes the synchronous adaptive tracking of the frequency amplitude of the power grid; the invention is suitable for the synchronous detection of electrical parameters when the frequency and amplitude of the power grid signal change with time at the same time, and the accuracy of the algorithm is high. The precise measurement and analysis of the three elements of the power grid provides a reliable and effective technical support.

Description

Technical field[0001]The invention relates to the field of power system time-varying electrical signal analysis, in particular to an adaptive algorithm for the frequency and amplitude of transient electrical signals.Background technique[0002]The frequency and amplitude of the power system are important parameters to measure the quality of power. It is not only the feedback quantity to realize the stability control of the power system, but also serves as a benchmark for the accurate action of the relay protection device. Therefore, the frequency and amplitude of the grid are accurately measured And analysis is of great significance.[0003]With the introduction of the concept of smart grid, the access of large-scale distributed power sources and non-linear loads has caused the grid voltage and current frequency amplitude to show time-varying characteristics, which are unstable time-varying power signals.[0004]From the current published papers at home and abroad, there have been many re...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/04G01R23/02G06F17/18G06F17/16
Inventor 陈浩费传鹤王平孙晋杰王恒招张怀军万阳王连龙王恒杰
Owner LIUAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER
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