A voltage fluctuation and flicker signal detection method
A voltage signal and signal detection technology, applied in complex mathematical operations and other directions, can solve the problems of multi-frequency AM envelope signal detection error, noise sensitivity, affecting the amplitude and frequency estimation accuracy of AM envelope signal, etc., and achieves good noise immunity. The effect of stickiness and high detection accuracy
Active Publication Date: 2019-05-31
山东电立得动力科技有限公司
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[0007] The third disadvantage of the prior art is that this method is sensitive to noise and has modal aliasing effects
When the voltage fluctuation and flicker signal is interfered by noise and harmonics, the detection of the multi-frequency AM envelope signal will bring errors, so the signal needs to be filtered to affect the estimation accuracy of the amplitude and frequency of the AM envelope signal
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[0062]In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in this specification and the accompanying drawings.
[0063] A voltage fluctuation and flicker signal detection algorithm, the technical solution of the present invention: carry out mathematical modeling on the voltage signal containing flicker; according to the orthogonality characteristic of the cosine function, by constructing a suitable objective function, the fundamental signal The detection of the detection is transformed into a simple mathematical optimization equation solving problem; using the method of L0 norm regularization, the optimization equation for recovering the envelope from the modulation signal is established; by solving the above two optimization equations, the basic Detection and estimation of wave sign...
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The invention discloses a voltage fluctuation and flicker signal detection algorithm comprising the specific steps of mathematically modeling a voltage signal including flicker; converting detection of a fundamental wave signal into a simple mathematical optimization equation solving problem by constructing a proper target function according to an orthogonality characteristic of a cosine function; building an optimization equation for recovering an envelope from a modulation signal by using an L0 norm regularization method; and acquiring detection estimation of the fundamental wave signal and a flicker signal by solving the two optimization equations. The algorithm provided by the invention is high in detection precision and good in noise robustness which comes from the noise inhibition effect of a penalty term with a norm form in a flicker signal recovery equation.
Description
technical field [0001] The invention relates to the field of analysis of voltage fluctuation and flicker signals, in particular to a method for detecting voltage fluctuation and flicker signals based on L1 norm regularization, and in particular to a method for detecting voltage fluctuation and flicker signals. Background technique [0002] With the rapid growth of power system load, the addition of a large number of impact and capacitive loads has caused serious voltage fluctuations and flicker in the power grid, which has a greater impact on power quality and endangers the stable operation of the power system. In order to eliminate the interference and impact of voltage fluctuation and flicker on the power grid, the power supply department needs to detect and analyze it, so as to provide an effective decision-making basis for further power quality management. The essence of detecting voltage fluctuation and flicker is to estimate and extract the envelope waveform of the vol...
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IPC IPC(8): G06F17/14
Inventor 段文辉余红王发义刘锴高清维孙冬丁波
Owner 山东电立得动力科技有限公司