A Impulse Noise Filtering Method for Load Switching Event Detection

Abstract

The present invention provides a pulse noise filtering method for load switch event detection which is used to solve the problem that a common noise elimination device cannot effectively filter noisewith non-stationary and non-Gaussian features in the prior art. The power signal noise filtering method comprises the steps of: inputting actually measured power signals; performing segmentation on the actually measured power signals and rearranging data to a matrix; transforming the power signal matrix; performing matrix initialization prior to iteration; and performing iteration calculation on the matrix after the initialization is completed to obtain a matrix after pulse noise is filtered, and further converting the matrix to the power signals. Through transformation for the power signal matrix, the sparsity of the power signals is processed to effectively filter the pulse noise in the power signals and achieve high fidelity for the useful power signals, the phase step features of the power signals cannot be damaged, the method is simple and practicable, the computing speed is fast, and therefore, the accurate switch event detection can be performed to perform accurate decompositionfor domestic electricity load.

Description

technical field [0001] The invention belongs to the technical field of electric power detection and analysis, and in particular relates to a pulse noise filtering method for load switch event detection. Background technique [0002] With the development of smart grid, the analysis of household electricity load becomes more and more important. Through the analysis of electricity load, the power department can obtain more detailed user electricity consumption information, improve the accuracy of electricity load forecasting, and provide the basis for overall planning for the power department; household users can obtain the electricity consumption of each appliance in a timely manner information, and a granular list of electricity bills. At present, there are two main methods of electricity load decomposition: intrusive load decomposition and non-intrusive load decomposition. The non-intrusive load decomposition method does not need to install monitoring equipment on the inte...

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Problems solved by technology

[0003] This method needs to set a reasonable threshold for the power change value, and at the same time there are the following problems: some electrical appliances will have a large peak in the instantaneous power value at the moment of starting, that is, pulse noise (for example, the starting current of the motor is much greater than the rated current), which will cause The steady-state power change value of the electrical appliance is inaccurate, which affects the judgment of the switching event; the transient process of different household appliances is long or short (the duration and frequency of pulse noise are quite different), so the determination of the power change value becomes It is more difficult; due to the change of power quality (such as voltage sudden drop), the active power will have a sudden change, which is likely to cause misjudgment

This type of impulse noise has a large instantaneous power and presents obvious non-stationarity and non-Gaussian characteristics. The noise elimination equipment commonly used in the prior art cannot effectively filter out the impulse noise of the power signal, and at the same time cannot preserve the useful power signal, it is difficult to accurately detect switching events, and it is impossible to perform fine power analysis

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