De-noising method for ultra-high-voltage direct-current corona current signal
A DC corona and current signal technology, applied in the field of UHV DC corona current signal denoising, can solve problems such as large distortion, unsatisfactory effect, and no consideration of strong periodic narrowband interference, and achieves the evaluation standard of intuitive and good bathing effect. Effect
Active Publication Date: 2015-04-29
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
Because the frequency of the corona current signal itself is too high, the filtered signal of the corona current signal based on EMD space-time scale filtering still has high-frequency noise similar to the frequency of the corona current signal, which affects the accuracy of the corona current signal; on the other hand , since the EMD method is based on the idea of an envelope and is mainly aimed at white noise, it does not consider strong periodic narrowband interference. For strong periodic narrowband interference, the signal will be completely submerged
Therefore, in the denoising process of the corona current signal, the effect of using the EMD denoising method is not ideal, and the distortion is relatively large
In terms of continuous periodic interference and random noise suppression, the wavelet threshold denoising method is more used, but in the actual application process, such as the optimal wavelet base selection, threshold selection and corona current polymorphism signal processing, there are still problems. some problems
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[0031] The technical solution of the present invention will be described in further detail below in combination with specific embodiments according to the drawings in the description.
[0032] like figure 1 Shown is the flowchart of the UHV DC corona current denoising method disclosed in the present invention.
[0033] A denoising method suitable for UHV DC power supply current signal of the present invention, the main idea is to best express the original signal by searching for the best signal model, and then encode the model to achieve the purpose of denoising. The specific implementation is to find an optimal signal model in a complete signal model library by selecting a good wavelet base, so that the optimal criterion estimates the deviation between the "real signal" and the "measured signal" to obey the probability distribution of Gaussian white noise The probability is the highest. The invention selects a suitable wavelet base by analyzing the needs of the corona curre...
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The invention provides a de-noising method for an ultra-high-voltage direct-current corona current signal. The de-noising method mainly comprises a step of discrete wavelet transform of the signal and a minimum description length criterion based on an information theory. According to the main idea of the method, a best signal model is searched to achieve best expression of an original signal, and then the module is encoded, thereby achieving the purpose of de-noising; and by virtue of the combination of the discrete wavelet transform of the signal and the minimum description length criterion,a better de-noising effect is achieved. The method has the characteristics of being free of a predetermined threshold, and self-adaptive to data.
Description
technical field [0001] The invention belongs to the technical field of ultra-high power transmission, and specifically relates to a method for filtering and denoising corona current signals, in particular, introducing discrete wavelet transform and MDL (Minimum Description Length) in information theory into signal denoising, and proposes a A signal denoising method based on minimum description length and discrete wavelet transform suitable for UHV DC corona current signals. Background technique [0002] In recent years, with the continuous development of my country's economy, the production of various industries and the daily electricity consumption of residents have increased greatly. In addition to increasing the power generation, it is necessary to continuously improve the transmission capacity of electricity. The uneven distribution of my country's resources and power loads has further aggravated the construction needs of UHV power grids. The UHV power grid has a series...
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IPC IPC(8): G06F17/14
Inventor 刘元庆吕建勋陆家榆袁海文夏文岳李炼炼杨庆华郭剑鞠勇赵录兴
Owner CHINA ELECTRIC POWER RES INST