A load switch event detection method and system using maha distance measure

Abstract

The embodiment of the present invention discloses a load switch event detection method and system using Maha distance measurement, the method includes: step 101 obtains the signal sequence S collected in time order; step 102 obtains the cycle window length; step 103 obtains N delay signal vectors; Step 104 to obtain the covariance matrix; Step 105 to obtain N Maha vectors; Step 106 to obtain N Maha distance measures; Step 107 to detect load switch events.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a load switch event detection method and system. 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 strategies. [0003] At present, the...

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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

However, the accuracy of switching event detection is greatly affected by the noise in the power signal (power sequence), especially the impulsive noise in the power signal, which further affects the detection accuracy

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