Method and device for detecting switching event based on event detection algorithm of hypothesis testing

Abstract

The invention provides a method and device for detecting a switching event through an event detection algorithm based on hypothesis testing, and relates to the field of electric power detection. The method comprises the following steps: calculating goodness-of-fit values of all samples according to a detection window, a reference data set and a goodness-of-fit value formula, and determining a sample point with the maximum goodness-of-fit value as a suspicious sample point; taking the suspicious sample point as a base point, and taking a first sample window and a second sample window of which the lengths are a preset number from front to back; calculating a calculated value of the statistic Z; obtaining a calculated value of the probability value P according to the calculated value; and under the condition that the samples have significant difference, determining the suspicious sample point as a switching event occurrence point. According to the technical scheme provided by the invention, event inspection is only carried out on suspicious points, so that the operation is simple and rapid, the identification precision of the switching event is still ensured when the electric power isrelatively high, missing inspection is avoided, and the robustness is relatively high.

Description

technical field [0001] The invention relates to the field of electric power detection, in particular to a method and device for detecting switching events based on a hypothesis testing event detection algorithm. Background technique [0002] Non-invasive load monitoring (Non-intrusive load monitoring, NILM) technology Hart was first introduced in the 10th century in the 1980s. NILM technology adopts a non-intrusive load monitoring method. It only needs to collect power consumption data at the user's power entry point, and carry out load identification through signal analysis and processing, so as to realize online monitoring of the internal load of the entire system, and finally obtain the entire load. The state of all loads in the power network, this technology is easy to operate, low in cost, and high in efficiency, and it is also one of the important links for users and power companies to realize a two-way interactive service system. [0003] NILM includes four steps, na...

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Problems solved by technology

[0005] In view of the above problems, the present invention provides a method and device for detecting switching events based on an event detection algorithm based on hypothesis testing, which solves the problem that the recognition accuracy of switching events is poor, especially when the power consumption is high, the detection of switching events is more serious. question

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