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A load switch event detection method and system based on minimum information criterion
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A technology of load switch and event detection, applied in the direction of measurement device, measurement of electrical variables, measurement of time integration, etc., can solve problems such as detection performance degradation, inaccurate identification, and impulse noise.
Inactive Publication Date: 2020-07-03
GUANGDONG UNIV OF PETROCHEMICAL TECH
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Problems solved by technology
Due to the presence of noise in the system, the increase in active power caused by some electrical appliances whose active power is close to the threshold (ie 50W) may be weakened by the system noise when starting, so it cannot be accurately identified
Some household appliances that use motors (such as grinders and juicers) will generate severe impulse noise. Common event detection algorithms have a relatively large impact on noise, and the detection performance drops sharply, especially the impact of noise on the confirmation of event occurrence time. Very large, tends to produce large errors in the timing of events
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Embodiment 1
[0073] figure 1 It is a flowchart of a load switch event detection method based on the minimum information criterion in an embodiment of the present invention, such as figure 1 As shown, the load switch event detection method based on the minimum information criterion includes:
[0074] Step 101: Obtain the occurrence time of the marked load switching event, select multiple times of the same number before and after this time, and establish a switching event detection time sequence according to the order of time.
[0075] Wherein, the occurrence time of the marked load switching event is obtained by using the switching event detection method of the prior art, and the switching event detection method of the prior art is:
[0076] Step 1: Calculate the absolute value of the difference between two adjacent active power data, and judge whether the absolute value is greater than or equal to 30W, if so, perform step 3, otherwise, perform step 2.
[0077] Step 2: After reading the a...
Embodiment 2
[0121] figure 2 It is a system structure diagram of the load switch event detection method based on the minimum information criterion in the embodiment of the present invention, as shown in figure 2 As shown, the load switch event detection system based on the minimum information criterion includes:
[0122] The switch event detection time sequence generation module 201 is used to obtain the marked load switch event occurrence time, select multiple times of the same number before and after the time, and establish a switch event detection time sequence according to the order of time.
[0123] The active power difference calculation module 202 is configured to acquire the active power at each moment in the time series, and calculate the active power difference between two adjacent moments.
[0124] The first time period generation module 203 is configured to determine the first time period when the load switching event occurs according to the active power difference, specific...
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Abstract
The invention discloses a load switch event detection method and system based on a minimum information criterion. The method comprises the following steps of establishing a switch event detection timesequence; acquiring active power at each moment in the time sequence, and calculating an active power difference value between two adjacent moments; determining a first time period when a load switchevent is generated based on the active power difference value; calculating each power difference value in the first time period by using the minimum information criterion, and determining a time point corresponding to the maximum value of the minimum information criterion of the first time period to be a first time point; selecting multiple moments before and after the first time point to determine a second time period when the load switch event is generated; and using the minimum information criterion to calculate each power difference value in the second time period, and determining the time point corresponding to the maximum value of the minimum information criterion in the second time period to be a moment when the load switch event is generated. By using the method and the system, anoise influence can be eliminated to a great extent and the noise can be effectively withstood.
Description
technical field [0001] The present invention relates to the technical field of load switch event detection, in particular to a load switch event detection method and system based on minimum information criterion. Background technique [0002] The load switch event refers to the action of turning on or turning off the power switch of a load or electrical equipment. Load switching event detection is the most important step in energy decomposition. The so-called energy decomposition refers to decomposing the power value read at the meter into the power value consumed by a single load. At present, there are two main methods of load energy decomposition: intrusive load decomposition and non-intrusive load decomposition. The non-intrusive load decomposition method does not need to install monitoring equipment on the internal electrical equipment of the load, and only needs to obtain the load information of each electrical equipment according to the total information of the electr...
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