JP2009015736A - Active state determination method and active state determination system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an active state determination method, capable of determining whether a resident is in an active state or not from a measurement value and a threshold of power consumption, and an active state determination system using the method. <P>SOLUTION: The active state determination method comprises measuring a power consumption value at predetermined sampling time intervals by a watt-hour meter 3 in a power consumer 2, determining a reference deviation of power consumption value for a determination object time as a determination object value, comparing the determination object value with a predetermined threshold, determining, when the determination object value is larger than the threshold, presence of intentional operation by a resident to electric appliances in the power consumer, and determining, when the determination object value is not more than the threshold, absence of intentional operation by the resident to the electric appliances in the power consumer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an activity state determination method for determining the presence or absence of a resident's activity state from a measured value of electric energy, and an activity state determination system using this method.

Measure the power usage of the power consumer, and from this measurement value, whether the resident in the power consumer is intentionally using the electrical equipment, that is, whether this resident is active For example, a method and a system for remotely confirming the safety of an elderly person living alone have been developed. As a method of determining the presence or absence of the resident's activity state from the power usage status, the absolute value of the change amount of the total power consumption obtained at a predetermined sampling interval in a predetermined determination target time is rearranged in descending order, and the determination reference value And a method of determining using a threshold value (hereinafter referred to as “frequency distribution method”) is known (see, for example, Patent Document 1).
JP 2005-174249 A

  However, in this frequency distribution method, a threshold value serving as a reference value for detecting an active state (determining that a resident is in an active state) and a determination for obtaining a determination target value to be compared with this threshold value Two parameters called reference values are required, and the problem that the detection process of the activity state becomes complicated, and these threshold values and judgment reference values differ from season to season and from home to home, so the past total power consumption is measured in advance. There was a problem that values had to be acquired and learned and determined from these measured values.

  The present invention has been made in view of such problems, and uses a small number of parameters and does not require prior learning for determination of these parameters, so that the resident's activity state can be determined from the measured electric energy. It is an object of the present invention to provide an activity state determination method capable of making a determination and an activity state determination system using the method.

  In order to solve the above-mentioned problem, the activity state determination method according to the present invention measures the power amount value or current amount value of a power consumer at a predetermined sampling time interval, and the power amount value or current amount for the determination target time. The standard deviation of the value is obtained and used as a judgment target value. This judgment target value is compared with a predetermined threshold value, and when the judgment target value is larger than the threshold value, the resident's intentional operation with respect to the electrical equipment in the power consumer It is determined that there is no intentional operation of the resident on the electric equipment in the power consumer when the determination target value is equal to or less than the threshold value.

  In such an activity state determination method according to the present invention, a preferable method for setting a threshold value will be described. First, at least one of the electric devices used in the electric power consumer is selected as a reference electric device, and the reference electric device uses the power consumption or current consumption based on the power consumption or current consumption of the reference electric device. Calculate the electric energy value or the electric current amount value at the sampling time when it is assumed that it operates for a predetermined period of time (for example, 1 hour) and stops for the remaining time, and then the reference electrical device It is preferable to obtain a standard deviation from the power amount value or current amount value at the time of operation and the power amount value or current amount value when the reference electrical device is stopped, and to set the standard deviation as a threshold value.

  Alternatively, at least one of the electric devices used in the electric power consumer is selected as a reference electric device, and the reference electric device is turned on / off at every sampling time from the power consumption or current consumption of the reference electric device. Calculate the electric energy value or current amount value for each sampling time when it is assumed that OFF is repeated, and obtain the standard deviation from the electric energy value or current amount value for each sampling time in the judgment target time of the reference electrical device. The standard deviation is preferably set as a threshold value.

  Moreover, in order to solve the said subject, the activity state determination system which concerns on this invention is the electric energy memory | storage means (for example, memorize | stored the electric energy value or electric current amount value of the electric power consumer measured by the predetermined sampling time interval) The power amount information database 45 in the embodiment, the parameter storage means (for example, the parameter information database 44 in the embodiment) for storing the determination target time, the sampling time, and the threshold, and the determination target time, the sampling time, and the threshold from the parameter storage means Is read out from the electric energy storage means and the electric energy value or electric current value for the determination target time is read out, and the presence / absence of intentional operation of the resident's electric device is determined by any of the above-described activity state determination methods. And a determination unit (for example, the determination unit 42 in the embodiment).

  When the activity state determination method according to the present invention and the activity state determination system using this method are configured as described above, the occupant's activity state with a small number of parameters can be obtained from the power amount value or current amount value measured in the power consumer. In other words, the presence or absence of an intentional operation by a resident on the electrical equipment in the power consumer can be determined. At this time, the parameter (threshold value) used for the determination can be determined from the power consumption amount or the current consumption amount of the electric device (reference electric device) in the power consumer, so that prior learning or the like is unnecessary. be able to.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Here, the activity state determination method according to the present invention collects the power amount or current amount during a predetermined sampling time at a predetermined determination target time, and obtains a standard deviation of the power amount or current amount to obtain a threshold value. It is a method of determining the resident's activity state by comparing with (hereinafter referred to as "standard deviation method"). First, the configuration of an activity state determination system that determines whether or not a resident is in an active state using this activity state determination method will be described with reference to FIG. In the following description, a case where determination is made based on the amount of power will be described. The activity state determination system 1 is attached to a power supply inlet of a resident's house (electric power consumer 2) whose activity state is determined by this system, and an watt-hour meter 3 that measures the amount of power, and the watt-hour meter 3 It is comprised from the center server 4 which determines a resident's activity state from the electric energy measured by.

  The watt-hour meter 3 is connected to an external distribution facility or distribution system via a lead-in line, and is connected to an electric light line 5 laid in the electric power consumer 2. And electric power is supplied to the electric equipment 6 (Refrigerator 6a, the air-conditioning equipment 6b, the personal computer 6c, the electric lamp 6d, etc.) connected to the electric wire 5. The watt-hour meter 3 has a function of accumulating electric power used by these electric devices 6 at a predetermined time interval (corresponding to a “sampling time” described later) and accumulating as an electric energy value. . The electric energy value accumulated in the electric energy meter 3 in this way is taken out by the data transmission device 7 and transmitted to the center server 4 via the broadband router 8 connected to the network 9 such as the Internet. 4 accumulate | stores this electric energy value for every electric power consumer 2 in a database.

  FIG. 2 shows the configuration of the center server 4, which includes a data collection unit 41, a determination unit 42, a notification unit 43, a parameter information database 44, and an electric energy information database 45. Here, the parameter information database 44 manages parameters (determination target time, sampling time, and threshold) used in the activity state determination process for each power consumer 2, and for example, as shown in FIG. A user ID column 44a in which identification information (user ID) of the power consumer 2 is stored, a determination target time column 44b in which a determination target time is stored, a sampling time column 44c in which a sampling time is stored, and a threshold value are stored. The threshold column 44d to be used is one record, and parameters for the activity state determination process in the power consumer 2 are managed using the user ID as a key. Moreover, the electric energy information database 45 stores the electric energy value of the electric power consumer 2 in association with the collection time. For example, as shown in FIG. 4, the user whose user ID is stored is stored. The ID column 45a, the collection time column 45b in which the collection time is stored, and the power amount column 45c in which the power amount value is stored are defined as one record, and the power amount value measured in the house 2 using the user ID and the collection time as keys. Accumulated.

  The watt hour meter 3 is configured to collect a power amount value during each sampling time stored in the parameter information database 44 described above. The sampling time may be configured to set the same value in the parameter information database 44 and the watt hour meter 3 in advance, or the center server 4 sets these parameters in the parameter information database 44. In addition, the sampling time may be transmitted to the watt hour meter 3 via the network 9 and set. In addition, the power amount value measured by the watt hour meter 3 may be configured to be read by the data transmission device 7 at a predetermined time interval and transmitted to the data collection unit 41 of the center server 4 or at a predetermined timing. Thus, the data collection unit 41 of the center server 4 may collect the data via the data transmission device 7.

  And the determination part 42 of the center server 4 reads a parameter from the parameter information database 44, and reads an electric energy value from the electric energy information database 45, and the resident's based on the standard deviation method by an activity state determination process described later. Determine if there is activity. The determination result is passed to the notification unit 43, and is connected to the user terminal 10 (a user terminal that monitors the resident of the house 2 and is connected to the network 9 using a personal computer 10a, a mobile phone 10b, etc. Thus, the activity state of the resident of the power consumer 2 can be confirmed.

  Now, the activity state determination process (standard deviation method) executed by the determination unit 42 will be described with reference to FIGS. When the determination unit 42 is activated, first, a user ID for identifying the power consumer 2 and a time for determining the activity state (date + time, hereinafter referred to as “determination time”). ) Is set (step S100). This may set a user ID and a determination time based on a command from the user terminal 10, or the center server 4 starts the determination unit 42 at a predetermined time interval and is listed in advance. A user ID and a determination time may be set. Next, parameters (determination target time, sampling time, and threshold) are read from the parameter information database 44 based on the user ID (step S110). Then, from the power amount information database 45, the user ID is used as a key, the determination time is included, and past power amount values are read for the determination target time from the determination time (step S120). Here, when the determination target time is T and the sampling time is Δt, the number n of power amount values read from the power amount information database 45 is obtained by the following equation (1).

    n = T / Δt (1)

  As shown in FIG. 3, for example, when the determination target time T is set to 60 [minutes] and the sampling time Δt is set to 15 [minutes], the number n of read energy values is four. It becomes. In FIG. 7, the determination time is set to 11:00, and the past four electric energy values (11:00, 10:45, 10:30, 10:15) are read, including 11:00. Shows the state.

Then, the standard deviation S is obtained from the electric energy value read out in this way using the following equation (2) (step S130). In this equation (2), x _i represents the i-th value among the read power amount values, and x with a bar represents the average value of the read power amount values. .

Specifically, an average value (x with bar) of the read determination target time T is obtained (step S131), and a step is performed from each of the next read power value x _i. A difference is obtained by subtracting the average value obtained in S131, and the squares of the differences are summed and divided by n-1 (3 if n is 4) to obtain a variance (square deviation) (step S132). Finally, the standard deviation S is calculated by obtaining the square root of the variance (step S133).

  And the standard deviation S calculated | required in this way is made into a judgment object value, and it compares with the threshold value read by step S110 (step S140), and when the judgment object value is larger than a threshold value, the resident in the electric power consumer 2 When it is determined that the electric device 6 is intentionally operated (in an active state) (step S150) and the determination target value is less than or equal to the threshold value, a resident in the power consumer 2 intentionally uses the electric device 6 Is not operated (not active) (step S160). The determination target value (standard deviation S) obtained in the example of FIG. 7 is 83.4, and this determination target value is compared with a threshold value (23.1 in the case of FIG. 3). Since the value exceeds the threshold, it is determined that the resident is active.

  Next, a threshold value setting method used in the activity state determination process executed by the determination unit 42 will be described. FIG. 8 shows that when the outside air temperature is set to D6, in the electric power consumer, the electric energy average D1, the electric energy maximum value D2, the electric energy deviation average D3, the deviation maximum value D4 and the change accompanying the change of the air temperature D6. It shows the change of the quantity average D5. As is apparent from FIG. 8, the average power amount D1 and the maximum power amount value D2 decrease (changes) as the temperature D6 decreases (changes), but the deviation average D3, the maximum deviation value D4, and the change amount The average D5 is almost constant without being affected by the change in the temperature D6. Normally, the type and number of electric devices 6 to be used vary depending on the temperature change, and therefore the amount of electric power changes as shown in FIG. 8, but the deviation value of the electric energy varies depending on the temperature (season) and the electric device. It can be seen that it is not affected by the type and number.

  Therefore, in this embodiment, as a threshold value for determining the activity state, a change in the amount of electric power when absent, that is, the electric device 6 having a large standard deviation is selected, and the standard deviation of the electric device 6 is set as the threshold value. (In the following description, an electric device for setting a threshold is referred to as a “reference electric device”). Specifically, in this embodiment, the refrigerator is set as a reference electrical device, and the standard deviation of the electric energy value of the refrigerator is used as a threshold value. The refrigerator consumes a relatively large amount of power, and as shown in FIG. 9, since the compressor and the like are automatically and periodically turned on and off, the change in the amount of power is large even when the resident is absent. This is because the standard deviation also increases.

  Here, for example, if the power consumption of the refrigerator is 40 [Wh] on the average, it is assumed that it has been operated (turned on) for only half of the determination target time 60 [minutes] (30 minutes). Is 80 [Wh / 2] (In the following description, the unit of the integrated value (electric energy) for 30 minutes is set to Wh / 2, and the integrated value of electric power (electric energy) for 15 minutes is used. ) Is set to Wh / 4). In this case, the power consumption when the sampling time is 15 [minutes] is 40 [Wh / 4], and the standard deviation between 40 [Wh / 4] during operation and 0 [Wh / 4] during stop is obtained. 28.3. In addition, as power consumption of a refrigerator, the rated power consumption of the refrigerator can be used, for example. In calculating the threshold value, the power consumption during the sampling time is calculated on the assumption that it operates for a predetermined period of time (for example, 1 hour) serving as a reference for the rated power consumption and stops for the remaining time. It is also possible to configure as described above.

  Alternatively, in the determination target time, the refrigerator is repeatedly turned on and off at each sampling time, that is, the refrigerator is turned on and off by the number of times corresponding to the number n of electric energy values to be taken out, which is represented by the above formula (1). (When n = 4, it becomes 40,0,40,0 [Wh / 4], and the whole operation is performed for half of the determination target time), the standard deviation is 23.1. It becomes.

  FIG. 10 shows that when the sampling time Δt is set to 15 [minutes] and the determination target time T is 30, 60, 90, and 120 [minutes], the refrigerator operates half of the determination target time T (ON). The determination rate is compared between when the state and the off state are once each) and when the operation is performed according to the number of data n of the electric energy. Here, the determination rate is the ratio of the number of determinations when the presence / absence of the resident's activity matches the determination result with respect to all the determinations. As is apparent from FIG. 10, the standard deviation of the power amount of the reference electrical device is obtained according to the number n of power amount values used in the activity state determination process, and the determination rate is higher when this value is used as a threshold value. It turns out that it improves.

  FIG. 11 shows the standard deviation of the power amount value of the reference electrical device corresponding to the threshold value (the number n of power amounts used for determination) set as described above in the transition of the standard deviation of the power amount value for a certain day. ) Is applied. As shown in FIG. 11, when the activity state determination method according to the present embodiment is used, the determination target value (standard deviation) is equal to or less than the threshold when the resident is not in an active state, that is, at bedtime or when going out. On the contrary, when it is active, the judgment target value (standard deviation) is larger than the threshold value, so by comparing the standard deviation of this electric energy value with the threshold value, whether or not the resident is active Can be determined with high accuracy. Thus, according to the activity state determination method (standard deviation method) according to the present embodiment, the threshold for determination is set to the standard deviation of the power amount value measured by the watt hour meter in the power consumer to be determined. The most dominant electrical device is defined as the reference electrical device, and the power consumption of the reference electrical device is calculated from, for example, the power consumption specified in the specifications of the device, and the standard deviation is calculated from the power consumption by the above method. By determining the threshold value, it is possible to easily determine the activity state.

  As described above, according to the activity state determination method according to the present invention, the power amount value integrated at a predetermined sampling time is extracted for the determination target time with reference to the determination time, and these power amounts are obtained by the method described above. By obtaining a determination target value that is a standard deviation of values, it is possible to determine whether or not a resident is in an active state simply by comparing the determination target value with a threshold value. (Threshold) can be realized. In addition, at this time, the setting of the threshold value can be obtained from the power consumption of the dominant electrical device (for example, the refrigerator) with respect to the standard deviation of the power amount value measured in the power consumer to be determined, This threshold value is not affected by seasonal changes (temperature change, etc.), learning for setting this threshold value is not necessary, and the activity state determination method according to the present embodiment can be easily performed. it can.

  In addition, although the above example demonstrated the case where an active state was determined from the electric energy value of an electric power consumer, the same determination can be performed also using this electric power consumer's electric current amount value.

It is a block diagram which shows the structure of the activity state determination system which concerns on this invention. It is a block diagram which shows the structure of the center server in the said activity state determination system. It is explanatory drawing which shows the structure of a parameter information database. It is explanatory drawing which shows the structure of an electric power information database. It is a flowchart which shows the process of the active state determination method. It is a flowchart which shows how to obtain | require a standard deviation. It is explanatory drawing when calculating | requiring a standard deviation from an electric energy value. It is a graph which shows the change of the electric energy at the time of temperature and absence. It is a graph which shows the change of the electric energy of a refrigerator. It is a graph which shows the relationship between the setting method of a threshold value, and a determination rate. It is a graph which shows the transition of the standard deviation calculated | required from the electric energy value of a certain electric power consumer, and the threshold value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Activity state determination system 2 Electric power consumer 6 Electric equipment 42 Determination part (determination means)
44 Parameter information database (parameter storage means)
45 Electric energy information database (electric energy storage means)

Claims (4)

  Measure the power amount value or current amount value of a power consumer at a predetermined sampling time interval, determine the standard deviation of the power amount value or current amount value for the determination target time, and use it as the determination target value. It is compared with a predetermined threshold value, and when the determination target value is larger than the threshold value, it is determined that there is a resident's intentional operation on the electric equipment in the power consumer, and the determination target value is equal to or less than the threshold value An activity state determination method for determining that there is no intentional operation of the resident with respect to the electrical equipment in the electric power consumer at the time. Selecting at least one of the electric devices used in the electric power consumer as a reference electric device;
From the amount of power consumption or current consumption of the reference electrical device, when it is assumed that the reference electrical device operates for a predetermined period of time that is a reference for the amount of power consumption or current consumption and stops for the remaining time, The power amount value or current amount value at the sampling time is calculated, and the power amount value or current amount value when the reference electrical device operates, and the power amount value or current amount when the reference electrical device stops. The activity state determination method according to claim 1, wherein a standard deviation is obtained from the value, and the standard deviation is set as the threshold value. Selecting at least one of the electric devices used in the electric power consumer as a reference electric device;
From the power consumption amount or current consumption amount of the reference electrical device, the power amount value or current amount value for each sampling time when the reference electrical device is assumed to be repeatedly turned on and off every sampling time is calculated. The activity state determination method according to claim 1, wherein a standard deviation is obtained from the power amount value or the current amount value for each sampling time in the determination target time of the reference electrical device, and the standard deviation is set as the threshold value. . A power storage means for storing a power amount value or a current amount value of a power consumer measured at a predetermined sampling time interval;
Parameter storage means for storing the determination target time, the sampling time and the threshold;
4. The determination target time, the sampling time, and the threshold value are read from the parameter storage unit, and the power amount value or current amount value for the determination target time is read from the power amount storage unit, and any one of claims 1 to 3 An activity state determination system comprising: determination means for determining whether or not the resident has intentionally operated the electrical device by the activity state determination method according to claim 1.

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