A detection method and device for a load switch event based on manifold classification

Abstract

Embodiments of the present invention disclose a method and device for detecting a load switching event based on manifold classification. The method includes: step 1, inputting the measured first power signal sequence of the load, where N+1 is the first power The length of the signal sequence; Step 2, obtain the second power signal sequence ΔP: the length of the second power signal sequence ΔP is N; Step 3, segment the second power signal sequence ΔP, and divide the segmented The data is arranged as a data matrix P; Step 4, calculate the self-similar matrix A; Step 5, calculate the first diagonal matrix of the self-similar data matrix A; Step 6, calculate the manifold matrix M; Step 7, according to the Describe the manifold matrix M, calculate the spectral feature vector; Step 8, perform manifold classification on the data matrix P, and generate a classification result matrix R; Step 9, judge whether there is a switching event.

Description

technical field [0001] The invention relates to the field of smart grids, in particular to a method and device for detecting load switching events based on manifold classification. 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, household users can obtain the electricity consumption information of each electrical appliance in time, as well as a refined list of electricity charges; the power department can obtain more detailed electricity consumption information of users, and can improve the accuracy of electricity load forecasting, Provide a basis for overall planning for the power sector. At the same time, by using the electricity consumption information of each electrical appliance, the user's electricity consumption behavior can be obtained, which has guiding significance for the research of household energy consumption assessment and en...

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Problems solved by technology

In addition to setting a reasonable threshold for the power change value, this method also needs to solve the problems in the practical application of the event detection method: there will be a large peak in the instantaneous power value at the moment of starting of some electrical appliances (for example, the starting current of the motor is much larger than rated current), which will cause inaccurate steady-state power changes of electrical appliances, thereby affecting the judgment of switching events. This kind of spike is actually pulse noise; and the transient process of different household appliances may be long or short (the duration of pulse noise and There is a large difference in the frequency of occurrence), so it becomes more difficult to determine the power change value; due to changes in power quality (such as voltage sudden drops), the active power will change abruptly, which is likely to cause misjudgment

Although this method is simple and feasible, due to the widespread use of pulse noise and nonlinear loads, the accuracy of switching event detection is greatly reduced

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