A method and system for detecting an electrical switch event

Abstract

The invention discloses an electric appliance switch event detection method and a system. The method comprises the following steps: obtaining the optimal length of time window obtained by training thepower sequence of the marked switching events by using a first-order linear regression function and a Kriging interpolation method; acquiring a total power sequence to be detected collected in chronological order; establishing a first time window and a second time window immediately following the first time window, both lengths of the time windows being optimal lengths of the time windows; the left and right sides of the total power sequence to be detected being filled with data; sliding two time windows from the center of the first time window aligned with the first data of the total power sequence, until the center of the first time window is aligned with the last data of the total power sequence, the data within the two time windows are subjected to a chi-square test for each step of sliding one data to determine whether a switching event occurs at each data in the total power sequence. The method and the system of the invention can effectively avoid the influence of noise on the detection accuracy and improve the detection accuracy.

Description

technical field [0001] The invention relates to the technical field of electrical switch events, in particular to a method and system for detecting electrical switch events. 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 a timely manner, as well as a detailed list of electricity charges; the power department can obtain more detailed user electricity consumption information, and can improve the accuracy of electricity load forecasting, Provide a basis for overall planning for the power sector. At the same time, using the electricity consumption information of each appliance, the user's electricity consumption behavior can be known, which is of guiding significance for household energy consumption assessment and research on energy-saving strate...

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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), it will cause inaccurate steady-state power change value of the appliance, which will affect the judgment of switching events; the transient process of different household appliances may be long or short, so it becomes more difficult to determine the power change value; due to the power quality Changes (such as sudden drop in voltage) will cause sudden changes in active power, which is likely to cause misjudgment

[0009] Existing switching event detection methods can identify switching events with relatively large active power changes (greater than 70W). Due to the existence of noise in the system, some electrical appliances with active power close to the threshold (that is, 50W) will cause an increase in active power when starting. May be attenuated by system noise and thus cannot be accurately identified

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