JP6539614B2 - Current waveform extraction method - Google Patents

Description

  The present invention relates to, for example, a current waveform extraction method for extracting a current waveform of an electric device operating under the combined current waveform flowing in a distribution board.

  For example, as a method of estimating the power consumption of various electric devices used in homes and offices, the current extracted from the combined current waveform flowing through the distribution board is extracted according to the operating state of the electric device. A method has been proposed for estimating the power consumption of electrical devices based on waveforms. In this method, for example, a sensor is attached to a distribution board, and the sensor measures current waveforms with the electric device to be measured ON and OFF. And the candidate of a current waveform is extracted from the difference waveform of each measured current waveform, and the power consumption of an electric device is estimated by making the candidate of this current waveform into teacher data (for example, nonpatent literature 1 reference).

Kosai et al., "System for Estimating Power of Each Device Based on Total Current", 2014 IEICE Communications Society Conference B-9-1, (1)-Overview-

  However, the technique described in Non-Patent Document 1 manually extracts the current waveform, so the work load associated with the extraction of the current waveform becomes large. In addition, when the electric device has a plurality of operating states, it is possible to obtain current waveforms corresponding to a plurality of operating states, for example, only the current waveform corresponding to the operating state immediately before turning off the electric device can be acquired. There was a problem of being unable to

  The present invention has been made in view of the above-mentioned circumstances, and it is possible to extract a current waveform corresponding to the operating state of the electric device without manually relying on it and extracting each even when there are a plurality of operating states. It is an attempt to provide a way.

  In order to solve the above problems, according to a first aspect of the present invention, a current waveform is extracted from an operation of extracting a current waveform according to an operating state of an electrical device connected to the power supply line from the current waveform flowing through the power supply line. In the current waveform extraction method executed by the device, a process of measuring a current waveform flowing through the power supply line by a measurement unit at a constant time interval, and a power value corresponding to the measured current waveform are stored immediately before Storing the current waveform after the change and the corresponding power value in the storage unit when the power value stored in the unit changes beyond a preset first threshold, and the storage unit Of the plurality of current waveforms stored in one of the plurality of current waveforms stored in one of the plurality of current waveforms stored in one of the plurality of current waveforms, A process of calculating a unit differential current waveform by dividing, and a process of specifying a candidate of a current waveform according to the operation state of the electric device based on the calculated unit differential current waveform are included. It is a thing.

  According to a second aspect of the present invention, current waveform extraction is performed by the current waveform extraction device for extracting a current waveform according to the operating state of an electrical device connected to the power supply line from the current waveform flowing through the power supply line In the method, a process of measuring a current waveform flowing through the power supply line by a measurement unit at a constant time interval, and an average current value corresponding to the measured current waveform is an average previously stored in the storage unit. Storing the current waveform after the change and the corresponding average current value in the storage unit when the current value changes by exceeding the preset first threshold value; A process of calculating a unit differential current waveform by calculating a differential current waveform between current waveforms adjacent in storage timing among a plurality of current waveforms, and dividing the differential current waveform by the area thereof , On the basis of the calculated unit differential current waveform, in which so as to comprise a step of identifying a candidate of a current waveform corresponding to the operation state of the electrical device.

According to a third aspect of the present invention, the n-th and n + 1-th differential current waveforms calculated in the process of calculating the unit differential current waveform when specifying the current waveform candidate are respectively ΔI _n (t), Assuming that ΔI _{n + 1} (t) and the unit differential current waveforms are J _n (t) and J _{n + 1} (t), respectively, the unit differential current waveforms J _n (t) and J _{n + 1} (t) The area | J _{n + 1} (t) −J _n (t) | of the difference with) is compared with the second threshold, and the area | J _{n + 1} (t) −J _n (t) | The differential current waveforms ΔI _n (t) and ΔI _{n + 1} (t) are selected as candidates of current waveforms according to the operating state of the electric device, when smaller than the threshold value of.

According to a fourth aspect of the present invention, the n-th and n + 2-th differential current waveforms calculated in the process of calculating the unit differential current waveform when specifying the current waveform candidate are respectively ΔI _n (t), Assuming that ΔI _{n + 2} (t) and the unit differential current waveforms are J _n (t) and J _{n + 2} (t), respectively, the unit differential current waveforms J _n (t) and J _{n + 2} (t) The area | J _{n +2} (t) −J _n (t) | of the difference with) is compared with the second threshold, and the area | J _{n + 2} (t) −J _n (t) | The differential current waveforms ΔI _n (t) and ΔI _{n +2} (t) are selected as candidates of current waveforms according to the operation state of the electric device, when smaller than the threshold value of.

According to a fifth aspect of the present invention, the nth, n + 1st and n + 2th difference current waveforms calculated in the process of calculating the unit difference current waveform when specifying the current waveform candidate are respectively ΔI _n ( _Let t), ΔI _{n + 1} (t), ΔI _{n + 2} (t), and let the unit differential current waveform be J _n (t), J _{n + 1} (t), J _{n + 2} (t) when the area of the difference between the unit differential current waveform J _n and (t) J _{n + 1} and _{(t) | J n + 1} (t) -J n (t) | and the unit difference current waveform J _n ( t) and J _n difference area of _{+ 2 (t) | J n + 2} (t) -J n (t) | is calculated, respectively, the difference between the area of the calculated differences || J n _{+ 1} (t)-J _n (t) |-| J _{n + 2} (t)-J _n (t) | | is calculated and compared with the second threshold, | | J _{n + 1} (t)- J _n (t) |-| J _{n + 2} (t) -J _n (t) || is smaller than the second threshold, the differential current waveform ΔI _{n + 1} (t), ΔI _{n + 2} ( t) the electric device It is obtained so as to select a candidate of the current waveform corresponding to the operating state.

According to a sixth aspect of the present invention, in identifying the candidate of the current waveform, instead of the differential current waveform ΔI _n (t), ΔI _{n + 1} (t) or ΔI _{n + 2} (t) The unit differential current waveforms J _n (t), J _{n + 1} (t) or J _{n + 2} (t) are candidates for current waveforms according to the operating state of the electric device.

  According to the first and second aspects of the present invention, the current waveform flowing through the power supply line is constantly measured, and the change in the current waveform is extracted based on the power value or the average current value corresponding to the measured current waveform. Based on the change of the extracted current waveform, the candidate of the current waveform according to the operation state of the electric device is specified. For this reason, it becomes possible to extract the feature of the waveform change over the whole section of the current waveform without relying on the manual work of the operator, and even if the electrical device has a plurality of operating states, these operations can be performed. Current waveforms corresponding to each of the states can be extracted without leakage.

  According to the third to fifth aspects of the present invention, when identifying the candidate of the current waveform, a section in which a change between unit differential current waveforms is small, that is, one having a high similarity between two waveform shapes that meet a difference. It is possible to appropriately identify current waveform candidates that are selected and in accordance with the operating state of the electrical device.

According to the sixth aspect of the present invention, the unit differential current waveform J _n (t), J instead of the differential current waveform ΔI _n (t), ΔI _{n + 1} (t) or ΔI _{n + 2} (t) _{n + 1} (t) or J _{n + 2} (t) can be candidates for the current waveform according to the operating state of the electrical device.

  That is, according to each aspect of the present invention, it is possible to provide a current waveform extraction method capable of extracting current waveforms corresponding to the operating state of an electrical device without relying on manual operations and each having multiple operating states. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the function structure of the current waveform extraction apparatus which performs the current waveform extraction method which concerns on the 1st Embodiment of this invention. FIG. 7 is a flowchart showing the procedure and contents of a current waveform extraction method executed by the current waveform extraction device shown in FIG. 1; FIG. 3 is a view for explaining an example of the current waveform extraction process shown in FIG. 2; FIG. 7 is a view for explaining an example of waveform selection processing and clustering processing of the current waveform extraction processing shown in FIG. 2; The flowchart which shows the procedure and content of the current waveform extraction method which concern on the 1st Embodiment of this invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
First Embodiment
(Constitution)
FIG. 1 is a block diagram showing a functional configuration of a current waveform extraction apparatus that executes a current waveform extraction method according to a first embodiment of the present invention, wherein DS indicates a distribution board and 1 indicates a current waveform extraction apparatus. There is.

  The current waveform extraction device 1 includes a measurement unit 2 that measures a current value, a control unit 3, a storage unit 4, and an output unit 5. The measurement unit 2 is connected to the lamp line of the distribution board DS, and measures and outputs the current waveform I (t) flowing through the lamp line at fixed time intervals. The measurement unit 2 may be included in the current waveform extraction device 1, but when a sensor capable of measuring the current value is already attached to the distribution board DS, this sensor may be used.

  The control unit 3 and the storage unit 4 and the output unit 5 are realized by, for example, a personal computer. The storage unit 4 uses a hard disk drive (HDD) or a solid state drive (SSD) as a storage medium, and includes a temporary storage unit 41 and a storage unit 42. The temporary storage unit 41 and the storage unit 42 calculate the power value P calculated from the current waveform I (t) measured by the measuring unit 2 and the current waveform I (t) in the current waveform extraction process by the control unit 3. Is used to store temporarily or continuously.

  The control unit 3 has a CPU (Central Processing Unit), and as a processing function necessary to realize the first embodiment, the power value calculation unit 31, the comparison unit 32, the forming unit 33, and the selection unit 34. And a clustering unit 35. These processing function units are realized by causing the CPU to execute a program stored in a program memory (not shown).

  Every time the current waveform I (t) measured from the measurement unit 2 is output, the power value calculation unit 31 performs a process of calculating the power value P corresponding to the current waveform I (t). Then, the current waveform I (t) and the power value P are output to the comparison unit 32.

The comparison unit 32 determines whether the difference between the power value P and the power value P _n−1 previously stored in the temporary storage unit 41 is larger than a preset threshold value P _X by the power value calculation unit 31. . Then, the current waveform I (t) and the power value P when it is determined that the difference between the power values is larger than the threshold Px are overwritten and stored in the temporary storage unit 41 and additionally stored in the storage unit 42.

Based molding unit 33, the current waveform stored in the storage unit _{42 I n (t) (n} = 1,2,3, ...) and the power value _{P n (n = 1,2,3, ...} ) and Then, the differential current waveform ΔI _n (t) in which the storage order is adjacent is calculated. Then, the differential current waveform [Delta] I _n (t), processing for calculating the unit differential current waveform J _n (t) by dividing the power value corresponding to the differential current waveform ΔI _n (t).

The molding unit 33, the storage order adjacent two unit differential current waveform _{J n (t), J n} + 1 and area A _n of the difference (t), the unit difference current waveform storage order further one away The area B _n of the difference between J _n (t) and J _{n + 2} (t) is calculated and output to the sorting unit 6.

The sorting unit 34 determines whether or not the areas A _n and B _n calculated by the forming unit 33 and the area | A _n −B _n | of the difference between them are equal to or less than a threshold ε that is separately determined. Then, if it is equal to or less than the threshold ε, the corresponding differential current waveform ΔI _n (t), ΔI _{n + 1} (t), ΔI _n (t), ΔI _{n + 2} (t) or ΔI _{n + 1} (t), A process of outputting ΔI _{n +2} (t) to the clustering unit 7 is performed.

The clustering unit 35 clusters the sorted differential current waveform ΔI _m (t) sorted by the sorting unit 34 using an existing method such as the k-means method, and the clustered differential current waveform ΔI is clustered in each cluster. Calculate the average waveform of _m (t). Then, the calculation result is output to the output unit 5 as the candidate waveform ΔI _A (t), ΔI _B (t), ΔI _C (t),... Of the current waveform of the electric device.

The output unit 5 has a communication interface, and the candidate waveform ΔI _A (t), ΔI _B (t), ΔI _C (t), ... of the current waveform of the electric device calculated above is, for example, a teacher of a support vector machine It transmits to the processing device which is not illustrated as data.

(Operation)
Next, the current waveform extraction operation performed by the device configured as described above will be described according to the processing procedure of the control unit 3. FIG. 2 is a flowchart showing the processing procedure and the processing content by the control unit 3.

  The electric current waveform according to the operation state of the several electric equipment connected to the said electric power line flows in the electric light line accommodated in the electricity distribution panel DS in the state synthesize | combined. The combined current waveform is measured by the measuring unit 2 at fixed time intervals, and is output to the control unit 3. In the control unit 3, the current waveform I (t) output from the measuring unit 2 is fetched at step S11. Then, in step S12, the power value calculation unit 31 calculates the power value P corresponding to the current waveform I (t). The power value P is calculated by multiplying the current waveform I (t) by the voltage waveform V (t) and integrating.

Next, in step S13, the difference | P−P _n−1 between the power value P calculated by the power value calculation unit 31 by the comparison unit 32 and the power value P _n−1 previously stored in the temporary storage unit 41. Is calculated. Then, the calculated difference between the two power values | P-P _n-1 | is whether greater than the preset threshold value P _X is determined. As a result of this determination, if the difference | P−P _n−1 | of the power values is larger than the threshold value Px, the current waveform I (t) and the power value P are the current waveform I previously stored in the temporary storage unit 41. It is stored instead of _n-1 and P _n-1 . At the same time, in step S14, the current waveform I (t) and the power value P are additionally stored in the storage unit 42. The result in the storage unit 42, the difference between the power values | P-P _n-1 | current waveform I _n (t) and the power value P _n when it is determined that greater than the threshold value Px is stored.

Next, in the control unit 3, under the control of the shaping unit 33, in step S15, a difference current waveform ΔI _n (t) between current waveforms adjacent in storage order is calculated. Then, a unit differential current waveform J _n (t) is calculated from the calculated differential current waveform ΔI _n (t). The unit differential current waveform J _n (t) is calculated by dividing the differential current waveform [Delta] I _n (t), the power value corresponding to the differential current waveform ΔI _n (t). The power value corresponding to the differential current waveform ΔI _n (t) is calculated by integrating by multiplying the voltage waveform V (t) to the differential current waveform ΔI _n (t).

3, the measurement of the current waveform by the measuring section 2, the current waveform I _n (t) and the power values stored in P _n, differential current waveform [Delta] I _n by molding section 33 (t) and a unit difference in the storage unit 42 It is a figure which illustrates concretely a series of processings to calculation of current waveform _Jn (t). In FIG. 3, the vertical axis represents the power value, and the horizontal axis represents time, and the time change of the power value on the distribution board DS is schematically shown.

The current waveform I (t) is measured at fixed time intervals (for example, 10 seconds). That is, two 50-Hz waveforms are acquired at time intervals of about one minute. The power value P _n is calculated from the measured current waveform I (t). Then, when the calculated power value P _n changes by a threshold P _X or more with respect to the power value P _n−1 previously stored in the temporary storage unit 41, the current waveform I (t) after the change and the power The value P _n is additionally stored in the storage unit 42. Therefore, the current waveforms I ₁ (t), I ₂ (t),..., I _N (t) and the power values P ₁ , P ₂ ,..., P _N stored in the storage unit 42 are shown in FIG. So as to be unequal time intervals.

In further shaped portion 33, the unit difference current waveform at two timings adjacent which the calculated _{J n (t), J n} + 1 (t) the difference between the area A _n of between, units in one further away timing The area B _n of the difference between the differential current waveforms J _n (t) and J _{n + 2} (t) is calculated. Then, the calculated areas _An and _Bn are output to the sorting unit 34.

The following control unit 3, under the control of the sorting section 34, at step S16, whether the area A _n calculated by the molding unit 33 is equal to or smaller than the threshold ε separately determined is determined. Then, if it is not more than the threshold value ε, the corresponding differential current waveform ΔI _n (t), ΔI _{n + 1} (t) is output to the clustering unit 7. Further, it is determined whether the area B _n is equal to or less than a threshold value ε which is separately determined. Then, when the threshold value ε or less, the corresponding differential current waveforms ΔI _n (t) and ΔI _{n + 2} (t) are output to the clustering unit 7. Furthermore, the area A _n and the area of the difference between B _n | A _n -B _n | is calculated, the area of the calculated differences | whether is equal to or lower than the threshold ε separately specified | A _n -B _n Is determined. Then, in the case where the threshold value ε or less, corresponding differential current waveforms ΔI _{n + 1} (t) and ΔI _{n + 2} (t) are output to the clustering unit 7.

Subsequently, in the control unit 3, under the control of the clustering unit 35, in step S17, the differential current waveform ΔI _m (t) sorted by the sorting unit 34 is clustered, and the differential current waveform ΔI clustered in each cluster. The average waveform of _m (t) is calculated.

FIG. 4 shows an example of the selection result of the area _An and the area B _n calculated by the forming unit 33, and an appearance of the clustering process. In Figure 4, the unit difference current waveform at two timings adjacent _{J n (t), J n} + 1 (t) the area A _n of the difference between the horizontal axis and one remote unit in the timing difference current waveform The area B _n of the difference between J _n (t) and J _{n + 2} (t) is plotted on the vertical axis.

As shown in FIG. 4, in the selection unit 34, among the difference current waveforms ΔI _n (t), those having an area _An or an area B _n or an area difference | A _n −B _n | smaller than the threshold ε are selected Be done. If the area _An or area B _{n of} the difference current waveform ΔI _n (t) or the area difference | A _n −B _n | is small, it means that the similarity between the two waveform shapes meeting the difference is high. These correspond to the points plotted near the horizontal axis and the vertical axis of FIG. 4 and near the diagonal line. In the clustering unit 35, clustering processing is performed on the differential current waveform ΔI _n (t) sorted by the sorting unit 6 as described above, whereby the average waveforms ΔI _A (t) and ΔI _B (within each cluster) are obtained. t), ΔI _c (t),. Then, the calculated average waveforms ΔI _A (t), ΔI _B (t), ΔI _C (t),... Are output to the output unit 5 as candidate waveforms of the current waveform of the electric device.

Finally, in step S18 under the control of the output unit 5, the differential current average waveforms ΔI _A (t), ΔI _B (t), ΔI _C (t),... It is transmitted to a processing device (not shown) as teacher data of the support vector machine. The operation of the support vector machine is described in detail in Non-Patent Document 1.

(effect)
As described above in detail, in the first embodiment, the power value P is calculated for each of the current waveforms I (t) measured at predetermined time intervals by the measurement unit 2, and the calculated power value P The current waveform I (t) and the power value P are stored in the storage unit 42 when the difference between the storage unit 41 and the previously stored power value P _n−1 is larger than the preset threshold value P _X. Then, based on the current waveform I _n (t) (n = 1, 2, 3,...) And the power value P _n (n = 1, 2, 3,. Calculates the differential current waveform ΔI _n (t) and the unit differential current waveform J _n (t) adjacent to each other, and further calculates two unit differential current waveforms J _n (t) and J _{n + 1} (t) adjacent to each other. calculating the difference between the area a _n of the calculation order is one additional remote units differential current waveform _{J n (t), J n} + 2 and the area B _n of the difference (t), respectively. Then, among the calculated area _An , _Bn or the area of the difference between these areas | A _n -B _n |, the differential current waveform ΔI _n (t), ΔI _{n +} corresponding to the value of the threshold ε or less. ₁ (t), ΔI _n (t), ΔI _{n + 2} (t) or ΔI _{n +1} (t), ΔI _{n + 2} (t) are clustered, and the selected differential current waveform ΔI clustered in each cluster The average waveform of _m (t) is set as the candidate waveform of the current waveform of the electric device, ΔI _A (t), ΔI _B (t), ΔI _C (t),.

  Therefore, the current waveform is constantly measured, and the feature of the waveform change is extracted based on the measurement result. For this reason, it becomes possible to extract the feature of the waveform change over the whole section of the current waveform without relying on the manual work of the operator, and even if the electrical device has a plurality of operating states, these operations can be performed. Current waveforms corresponding to each of the states can be extracted without leakage.

Second Embodiment
In the first embodiment, the power value P is calculated from the measured current waveform I (t), and the current waveform I (t) and the power value P when the power value P changes more than the threshold value P _X are calculated. Based on the stored current waveform I _n (t) (n = 1, 2, 3,...) And the power value P _n (n = 1, 2, 3,. The differential current waveform ΔI _n (t) and the unit differential current waveform J _n (t) are calculated.

On the other hand, in the second embodiment, the average current value I is calculated from the measured current waveform I (t), and the current waveform I (t) when the average current value I changes more than the threshold value I _X and the average current value I is stored in the storage unit 42, the stored current waveform _{I n (t) (n =} 1,2,3, ...) and the average current value I _n (n = 1, 2, 3, The differential current waveform ΔI _n (t) and the unit differential current waveform J _n (t) are calculated on the basis of.

  FIG. 5 is a flowchart showing the processing procedure and the processing content of the current waveform extraction method according to the second embodiment. The configuration of an apparatus for executing the current waveform extraction method is the same as that shown in FIG.

  The combined current waveform flowing in the lamp line housed in the distribution board DS is measured by the measuring unit 2 at a constant time interval and output to the control unit 3. In the control unit 3, the current waveform I (t) output from the measuring unit 2 is fetched at step S21. Then, in step S22, the average current value I is calculated by calculating the area of the current waveform I (t).

Next, in step S23, the comparison unit 32 calculates a difference | I−I _n−1 | between the calculated average current value I and the average current value In ₋₁ previously stored in the temporary storage unit 41. Ru. Then, it is determined whether or not the calculated difference | I−I _n−1 | of the average current values I is larger than a preset threshold I _X. As a result of this determination, if the difference | I−I _n−1 | of the power values is larger than the threshold Ix, the current waveform I (t) and the average current value I are the current waveforms previously stored in the temporary storage unit 41. It is stored instead of In _-1 and In _-1 . At the same time, in step S24, the current waveform I (t) and the average current value I are additionally stored in the storage unit 42. As a result, the current waveform I _n (t) (n = 1, 2, 3,...) When it is determined that the difference | I−I _n−1 | of the average current values I is larger than the threshold Ix. And the average current value I _n (n = 1, 2, 3,...) Are stored.

Next, in the control unit 3, under the control of the shaping unit 33, in step S25, a difference current waveform ΔI _n (t) between current waveforms adjacent in storage order is calculated. Then, a unit differential current waveform J _n (t) is calculated from the calculated differential current waveform ΔI _n (t). The unit differential current waveform J _n (t) is the differential current waveform [Delta] I _n (t), is calculated by dividing the area of the differential current waveform ΔI _n (t).

In further shaped portion 33, the unit difference current waveform at two timings adjacent which the calculated _{J n (t), J n} + 1 (t) the difference between the area A _n of between, units in one further away timing The area B _n of the difference between the differential current waveforms J _n (t) and J _{n + 2} (t) is calculated. Then, the calculated areas _An and _Bn are output to the sorting unit 34.

The following control unit 3, under the control of the sorting section 34, in step S26, whether the area A _n calculated by the molding unit 33 is equal to or smaller than the threshold ε separately determined is determined. Then, if the threshold value ε or less, the corresponding unit difference current waveform J _n (t), J _{n + 1} (t) is output to the clustering unit 7. Further, it is determined whether the area B _n is equal to or less than a threshold value ε which is separately determined. Then, when the threshold value ε or less, the corresponding unit difference current waveforms J _n (t) and J _{n + 2} (t) are output to the clustering unit 7. Furthermore, the area A _n and the area of the difference between B _n | A _n -B _n | is calculated, the area of the calculated differences | whether is equal to or lower than the threshold ε separately specified | A _n -B _n Is determined. Then, when the threshold value ε or less, the corresponding unit difference current waveform J _{n + 1} (t), J _{n + 2} (t) is output to the clustering unit 7.

Subsequently, in the control unit 3, under the control of the clustering unit 35, in step S27, the unit differential current waveform J _m (t) sorted by the sorting unit 34 is clustered, and the unit differential current is clustered in each cluster. An average waveform of the waveform J _m (t) is calculated.

Finally, under the control of the output unit 5, in step S28, unit differential current waveforms J _A (t), J _B (t), J _C (t), ... obtained for each cluster are illustrated. Not sent to the processing device. In the processing device, the unit differential current waveforms J _A (t), J _B (t), J _C (t),... Are used as teaching data when the support vector machine is replaced with a method such as the least squares method. Be The operation of the support vector machine is described in detail in Non-Patent Document 1.

As described above, according to the second embodiment, the average current value I is calculated from the measured current waveform I (t), and the current waveform when the average current value I changes more than the threshold value I _X I (t) and the average current value I is stored in the storage unit 42, the stored current waveform _{I n (t) (n =} 1,2,3, ...) and the average current value I _n (n = 1, Based on (2, 3,...), The differential current waveform ΔI _n (t) and the unit differential current waveform J _n (t) are calculated.

  Therefore, also in the second embodiment, the current waveform is constantly measured, and the feature of the waveform change is extracted based on the measurement result. For this reason, it becomes possible to extract the feature of the waveform change over the whole section of the current waveform without relying on the manual work of the operator, and even if the electrical device has a plurality of operating states, these operations can be performed. Current waveforms corresponding to each of the states can be extracted without leakage.

Other Embodiments
The present invention is not limited to the above embodiments, and the procedure and process of current waveform extraction processing, processing contents, and configuration of an apparatus for executing the extraction processing are variously modified without departing from the scope of the present invention. It is possible.

  In short, the present invention is not limited to the above embodiments as it is, and at the implementation stage, the components can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment. Furthermore, components in different embodiments may be combined as appropriate.

  DS: distribution board, 1: current waveform extraction device, 2: measurement unit, 3: control unit, 4: storage unit, 5: output unit, 31: power value calculation unit, 32: comparison unit, 33: forming unit 33 ... sorting unit, 35 ... clustering unit, 41 ... temporary storage unit, 42 ... storage unit.

Claims (6)

A current waveform extraction method for performing an operation of extracting a current waveform according to an operation state of an electrical device connected to a power supply line from a current waveform flowing through the power supply line, using a current waveform extraction device,
Measuring a current waveform flowing through the power supply line by a measuring unit at a constant time interval;
When the power value corresponding to the measured current waveform changes beyond the first threshold preset with respect to the power value stored in the storage unit immediately before, the current waveform after the change and the corresponding current waveform Storing the power value to be stored in the storage unit;
Among the plurality of current waveforms stored in the storage unit, a differential current waveform between current waveforms adjacent in storage timing is calculated, and the differential current waveform is divided by the area or the power value corresponding to the differential current waveform. Calculating a unit differential current waveform by
A method of current waveform extraction, comprising: identifying a candidate for a current waveform according to the operation state of the electric device based on the calculated unit differential current waveform. A current waveform extraction method for performing an operation of extracting a current waveform according to an operation state of an electrical device connected to a power supply line from a current waveform flowing through the power supply line, using a current waveform extraction device,
Measuring a current waveform flowing through the power supply line by a measuring unit at a constant time interval;
When the average current value corresponding to the measured current waveform changes by exceeding a first threshold preset with respect to the average current value stored in the storage unit immediately before, the current waveform after the change and Storing the corresponding average current value in the storage unit;
A process of calculating a unit differential current waveform by calculating a differential current waveform between current waveforms adjacent in storage timing among a plurality of current waveforms stored in the storage unit, and dividing the differential current waveform by the area thereof. When,
A method of current waveform extraction, comprising: identifying a candidate for a current waveform according to the operation state of the electric device based on the calculated unit differential current waveform. In the process of identifying the current waveform candidates, the n-th and n + 1-th differential current waveforms calculated in the process of calculating the unit differential current waveform are respectively ΔI _n (t) and ΔI _{n + 1} (t). and a unit differential current waveform, respectively J _n (t), when the J n _{+ 1} (t), the area of the difference between the unit differential current waveform J _n and (t) J _{n + 1} and (t) | J _{n +1 (t) -J n (t} ) | is compared with a second threshold value, the area _{| J n + 1 (t)} -J n (t) | If is smaller than the second threshold value, the difference The current waveform extraction method according to claim 1 or 2, wherein the current waveforms ΔI _n (t) and ΔI _{n + 1} (t) are selected as candidates for the current waveform according to the operation state of the electric device. In the process of identifying the current waveform candidate, the n-th and n + 2-th differential current waveforms calculated in the process of calculating the unit differential current waveform are respectively ΔI _n (t) and ΔI _{n +2} (t) and a unit differential current waveform, respectively J _n (t), when the J n _{+ 2} (t), the difference between the area of the unit differential current waveform J _n (t) and _{J n + 2 (t) |} J n _{+2 (t) -J n (t} ) | is compared with a second threshold value, the area _{| J n + 2 (t)} -J n (t) | If is smaller than the second threshold value, the difference 3. The current waveform extraction method according to claim 1, wherein the current waveforms ΔI _n (t) and ΔI _{n +2} (t) are selected as candidates for the current waveform according to the operation state of the electric device. In the process of identifying the current waveform candidate, the nth, n + 1st and n + 2th difference current waveforms calculated in the process of calculating the unit difference current waveform are respectively ΔI _n (t), ΔI _{n + 1} (t , ΔI _{n + 2} (t), and the unit differential current waveform is J _n (t), J _{n + 1} (t), J _{n + 2} (t), respectively, the unit differential current waveform J _n The area of the difference between (t) and J _{n + 1} (t) | J _{n + 1} (t) −J _n (t) |, and the unit differential current waveforms J _n (t) and J _{n + 2} (t The area of the difference between | J _{n + 2} (t) −J _n (t) | is calculated respectively, and the difference between the areas of the calculated differences || J _{n + 1} (t) −J _n (t) _{) || J n + 2 (t} ) compared with -J _n (t) a second threshold value to calculate the _{||, || J n + 1 (} t) -J n (t) || J _{When n + 2} (t) -J _n (t) | is smaller than the second threshold, the differential current waveform ΔI _{n + 1} (t), ΔI _{n + 2} (t) is the operating state of the electric device. Current according to Current waveform extracting method according to claim 1 or 2, characterized by selecting the form of the candidate. In the process of identifying the current waveform candidate, the unit differential current waveform J _n (t) may be used instead of the differential current waveform ΔI _n (t), ΔI _{n + 1} (t) or ΔI _{n + 2} (t). , J _{n + 1} (t) or J _{n + 2} (t) is selected as a candidate for a current waveform according to the operating state of the electrical device. Current waveform extraction method.