JP2015102526A - Power estimation device and power estimation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power estimation device for supporting power estimation for an apparatus in which power changes successively and capable of raising the accuracy of power estimation.SOLUTION: A power estimation device 200 is connected to a voltage-current measurement unit 102 for measuring the current waveform and voltage waveform of one or more power-consuming electric apparatuses 104, and estimates the power consumption of the electric apparatus from its current waveform, the power estimation device 200 comprising: a measurement control unit 212 for generating a measurement instruction for measurement performed by the voltage-current measurement unit 102; a power estimation unit 213 for comparing a current waveform pattern 221 representing the feature of a current waveform per electric apparatus 104, a power consumption pattern 222 representing the feature of power consumption per electric apparatus 104 and its fluctuation amount, and the feature of the measured current waveform and a registered current waveform pattern, and estimating the power per apparatus; and an estimated power correction unit 214 for comparing the estimated power against the power consumption pattern 222, and correcting the estimated power in accordance with the result of the comparison.

Description

  The present invention relates to a power estimation apparatus and a power estimation method.

  In order to appropriately manage power consumption against the background of energy supply and demand problems, there is an increasing need to accurately grasp the power consumption of each electrical device connected to a power source. Techniques relating to this are disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2012-16270 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2010-210575 (Patent Document 2). Patent Document 1 relates to a power monitoring apparatus and the like, and includes a measurement module, a change detection and search module, and an electrical equipment signature database. The measurement module measures power consumption characteristics of the power supply, and the change detection and search module detects and calculates changes in the power consumption characteristics. When a change is detected, the change detection and search module searches the appliance signature database by the change to obtain one or more candidate appliances and candidate appliance states or a combination of candidate appliance states. It is described that the user can check the search result and appropriately update the electrical equipment signature database.

  In Patent Literature 2, regarding the power estimation method, “the current component of the electric device 1040 in the total current waveform measured by the measurement sensor 11 is extracted, and the waveform of the extracted current component and the voltage measured by the measurement sensor 11 are extracted. A result obtained by multiplying the waveform is extracted as a waveform of power consumption of the electric device 1040. Based on the waveform of power consumption, the amount of power currently consumed by the electric device 1040 per unit time, "Outputs the amount of power consumed during a predetermined period (for example, 1 hour)", and "holds the amount of power consumed per unit time during operation, and sets the amount of power consumed per unit time to a predetermined amount A value obtained by multiplying the accumulated time of the estimated time that the electrical device 1040 was operating within the period is estimated as the power consumption consumed by the electrical device 1040 within a predetermined time. It has been described as.

JP 2012-16270 A JP 2010-210575 A

  Patent Document 1 discloses an electric device connected to a power source and a technique for grasping the state thereof, but mentions a technique for increasing the measurement accuracy of the power consumption of each electric device. Absent.

  On the other hand, among the power estimation methods described in Patent Document 2, in the case of the method in which the latter power consumption is held and the power consumption is consumed during the estimated time of operation, the power is a fixed value. Therefore, there is a problem that accurate power estimation cannot be performed for a device whose power continuously changes. On the other hand, the method of estimating the power by multiplying the waveform of the current component extracted by the former and the voltage waveform uses the extracted current component, so it is considered that it can be applied to a device whose power continuously changes. There is a problem that the estimation error of the current component may directly become the error of the estimation power.

  In addition, the total value of each estimated power must be equal to or smaller than the power of the entire system measured by the distribution board, but if each estimated power becomes larger than the actual power due to the estimation error, There is also a problem that the total estimated power exceeds the measured power of the entire system.

  One of the objects of the present invention is to estimate the power for each device so as to match the characteristics of the power consumption.

  In order to achieve the above object, according to one embodiment of the present invention, a current waveform and a voltage waveform measured for an electric device that consumes one or more electric powers are received, and the electric device is obtained from the current waveform of the electric device. In the power estimation device for estimating the power consumption of the power, based on the received data of the current waveform and the voltage waveform, a power estimation unit that estimates power for each electrical device, power consumption for each electrical device, and the It is determined whether the holding unit that holds the power consumption pattern that represents the characteristics of the fluctuation amount of the power consumption and the power estimated by the power estimation unit match the power consumption pattern that is held by the holding unit. And an estimated power correction unit that corrects the power according to the power consumption pattern.

  According to the present invention, it is possible to estimate the power of each device from the current measured by the distribution board so as to match the characteristics of each power consumption.

FIG. 1 is a schematic diagram showing a power supply system to which a power estimation apparatus 200 according to an embodiment of the present invention is connected. FIG. 2 is a diagram illustrating a configuration example of the power estimation apparatus 200. FIG. 3 is a flowchart for explaining a processing example S300 from current measurement to power estimation / power correction in the power estimation apparatus 200. FIG. 4 is a flowchart illustrating an individual power correction process S400 in the overall process of FIG. FIG. 5 is a flowchart illustrating an overall power correction process S500 in the overall process of FIG. FIG. 6 is a flowchart illustrating a power consumption pattern registration process S600 in the power estimation apparatus 200. FIG. 7 is an example of the power consumption pattern 222. FIG. 8 is an example of the power consumption type correspondence table 223. FIG. 9A is an example of a graph of power consumption change of a constant output type electric device. FIG. 9B is an example of a graph of a change in power consumption of a multi-output type electric device. FIG. 9C is an example of a graph of power consumption change of an output change type electrical device. FIG. 10 is an example of a power histogram. FIG. 11 is an example of a display screen of the power estimation apparatus 200. FIG. 12A is a diagram illustrating a histogram calculation section of power change. FIG. 12B is an example of a power change histogram. FIG. 13 is an example of the power consumption pattern 222B in the second embodiment of the present invention. FIG. 14 is a flowchart illustrating a histogram registration process S1400 of a part of power change in the power consumption pattern registration process in the second embodiment. FIG. 15 is a flowchart illustrating a correction process S1500 using a histogram of a part of power change in the individual power correction process according to the second embodiment. FIG. 16 is a diagram illustrating an example of correcting the estimated power. FIG. 17 is an example of a power change histogram. FIG. 18 is a diagram illustrating a configuration example of the power estimation apparatus 200 according to the third embodiment of the present invention.

  Hereinafter, the present invention will be described in accordance with an embodiment thereof with reference to the accompanying drawings. FIG. 1 shows a configuration example of a power supply system in which a power estimation apparatus 200 according to the first embodiment of the present invention is installed. As shown in the figure, for example, one or more electric devices 104 and 104 are connected to an AC power source 100 which is a commercial AC power source via a distribution board 103. The distribution board 103 is provided with a voltage / current measurement unit 102, and is connected between the AC power supply 100 and the electric device 104. The power estimation apparatus 200 is connected to the voltage / current measurement unit 102 so as to be communicable.

  The electric device 104 is a variety of devices used for consumer use and industrial use, such as home appliances (TVs, refrigerators, air conditioners, etc.) in general households, machine tools installed in factories, and the like.

  The distribution board 103 supplies AC power from the AC power supply 100 to one or more electrical devices 104 connected via the distribution board 103. The AC power source 100 is, for example, a distributed power source (solar power generation device, wind power generation device, fuel cell, micro gas turbine, etc.) installed in a pole transformer in a power system, a general household, a commercial building, a factory, or the like. Yes, it is not limited to specific facilities and devices.

  The distribution board 103 is a wiring facility that distributes alternating current supplied from the alternating current power supply 100 through a power supply line 101 such as a low-voltage distribution line to indoor wiring and the like, and includes various protective devices (leakage breakers (breakers), wiring). Circuit breaker (safety breaker)).

  The voltage / current measurement unit 102 measures an AC voltage waveform (change in voltage value over time) and a current waveform (change in current value over time) flowing through the power supply line 101. The voltage / current measurement unit 102 is configured using, for example, PT (Potential Transformer), CT (Current Transformer), or the like. When there are a plurality of electrical devices 104 that receive AC power supplied from the distribution board 103, the AC current value flowing through the power supply line 101 measured by the voltage / current measuring unit 102 is supplied to these electrical devices 104. This is the sum of the current values. The voltage / current measuring unit 102 may be provided in the distribution board 103 or may be provided independently of the distribution board 103. In addition, when the distribution panel 103 is provided with a smart meter, the voltage / current measurement unit 102 may be provided in the smart meter.

  The power estimation apparatus 200 includes information indicating whether or not the electrical device 104 is operating (in operation (the power of the electrical device 104 is turned on)), and various types of information related to power supply to the electrical device 104 (the electrical device 104). It is a device that monitors the power consumption etc.)). The power estimation apparatus 200 acquires the operating status of the electric device 104 based on the AC voltage waveform and the current waveform measured by the voltage / current measuring unit 102, and manages the acquired operating status for a resident of a general household or factory equipment. To users, such as those. When the distribution board 103 is provided with a smart meter, all or some of the functions of the power estimation apparatus 200 may be realized by the smart meter.

  Next, a configuration example of the power estimation apparatus 200 according to the first embodiment of the present invention will be described. FIG. 2 shows a configuration example of the power estimation apparatus 200 according to the first embodiment of the present invention. In the power estimation apparatus 200, a display device 201, an instruction input unit 202, an I / O interface 203, a CPU 205, a memory 206, a timer 207, an auxiliary storage interface 208, and a measurement input unit 204 are coupled to be communicable via a bus. In addition, a voltage / current measurement unit 102 is provided outside the power estimation apparatus 200 and is connected to a measurement input unit 204 of the power estimation apparatus 200. The voltage / current measuring unit 102 is connected between the AC power supply 100 and the electric device 104 to be measured. As described above, the voltage / current measurement unit 102 is provided, for example, on the distribution board 103.

  The voltage / current measurement unit 102 and the measurement input unit 204 measure the alternating voltage and current flowing through the power supply line 101 at intervals of about 20000 times per second, and digitize the voltage / current waveform. The power estimation apparatus 200 measures the instantaneous values of voltage and current at the time intervals described above at least during the period of the AC voltage cycle.

  The display device 201 includes a display device such as an LCD (Liquid Crystal Display) and an organic EL (Electroluminescence), and displays various information including a series of operation screens such as a data registration screen and an identification result screen.

  The instruction input unit 202 is a device that receives an operation instruction from a user, and includes a pointing device represented by a mouse, a touch panel integrated with the display device 201, and the like in addition to buttons. For example, the buttons displayed on the display device 201 can be configured to be operated using a pointing device such as a mouse of the instruction input unit 202 or a touch panel.

  The display device 201 and the instruction input unit 202 are connected to other parts by an I / O interface 203.

  A CPU (Central Processing Unit) 205 is a processor that executes a control program 210 loaded in the memory 206, and controls each unit of the power estimation apparatus 200.

  The memory 206 includes a semiconductor storage device such as a DRAM (Dynamic Random Access Memory), and provides a storage area for temporarily storing various programs executed by the CPU 205 and data.

  The timer 207 is used to generate the current time by a crystal oscillation mechanism or the like and to measure the timing at which the voltage / current measurement unit 102 performs measurement.

  The auxiliary storage interface 208 is connected to the auxiliary storage device 209 via a bus, and the CPU 205 plays a role of mediating data transmission / reception with the auxiliary storage device 209.

  The auxiliary storage device 209 is a storage device including a storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores and holds the control program 210 and the storage data 220. Part.

  The control program 210 includes a UI control unit 211, a measurement control unit 212, a power estimation unit 213, an estimated power correction unit 214, and a data registration unit 215.

  The stored data 220 includes a current waveform pattern 221, a power consumption pattern 222, and a power consumption type correspondence table 223. The current waveform pattern 221 is data of current waveform characteristics for each electrical device, and is, for example, a frequency analysis result of the current waveform described in Patent Document 1. The power consumption pattern 222 is data of characteristics of power consumption for each electric device. An example of the power consumption pattern 222 will be described later.

  Next, each functional unit of the control program 210 will be described. The UI control unit 211 is a part that displays and switches the screen, and has a function of controlling display on the display device 201.

  The measurement control unit 212 has a function of sampling an AC voltage waveform and a current waveform flowing through the power supply line 101 and input to the measurement input unit 204 from the voltage / current measurement unit 102 and storing them in the auxiliary storage device 209. The voltage waveform and current waveform may be sampled by the voltage / current measurement unit 102, and the measurement control unit 212 may receive the result and store the result in the auxiliary storage device 209.

  The power estimation unit 213 compares the current waveform acquired by the measurement control unit 212 with the specific current waveform stored as the current waveform pattern 221 (performs similarity determination), thereby operating the electric device 104 in operation. It has a function to estimate the power consumption. Note that the power estimation method is a known technique using a current waveform, and may be the method described in Patent Document 1 or another method.

  The estimated power correction unit 214 has a function of correcting the power estimated by the power estimation unit 213 for each device based on the data of the power consumption pattern 222. The details of the estimated power correction process will be described in the description of the power correction process described later.

  The data registration unit 215 has a function of registering the current waveform pattern 221 and the power consumption pattern 222 as device information in association with each electric device 104.

<Power estimation processing>
Next, an example of overall processing in the power estimation apparatus 200 of this embodiment will be described. FIG. 3 is a flowchart for explaining an example of the entire process (power estimation process S300) performed by the power estimation apparatus 200 during current estimation and power estimation / power correction. For example, when the user performs a predetermined process start operation via the instruction input unit 202, the power estimation apparatus 200 starts the power estimation process S300.

  In the power estimation apparatus 200, first, the measurement control unit 212 acquires an AC voltage / current waveform flowing through the power supply line 101, which is input from the voltage / current measurement unit 102 to the measurement input unit 204 (S301).

  Next, the power consumption for each electrical device 104 is estimated from the measured current waveform based on the current waveform pattern 221 already recorded (S302). Here, as a method for estimating power, a known technique may be used, and as described in Patent Document 1, a component of a current waveform for each device may be obtained and then multiplied by a voltage waveform, or for each device. The power for each operation state of the device may be output as a fixed value.

<Individual power correction processing>
Subsequently, the power estimation apparatus 200 corrects the power for each device estimated in S302 based on the power consumption pattern 222 (S303 to S305).

  Here, the power consumption pattern 222 will be described. FIG. 7 is a table for explaining a data configuration example of the power consumption pattern 222. The power consumption pattern 222 includes items of a device ID 701, a device name 702, a power consumption type 703, and a power range 704. The device ID 701 is an identifier uniquely assigned to each electric device 104 in the power estimation apparatus 200 (hereinafter referred to as device ID). The device ID 701 is also included in the current waveform pattern 221, and the current waveform pattern 221 and the power consumption pattern 222 are associated with each other by the device ID 701. The device name 702 is a character string registered by the user to distinguish the electrical device 104. The power consumption type 703 represents the type of power consumption for each device. The power range 704 represents the maximum value and the minimum value of power.

  Here, the power consumption type 703 and the power range 704 in the power consumption pattern 222 will be described using a graph showing a change in power consumption for each power consumption type shown in FIG. The power consumption graph in FIG. 9 is assumed to be measured in a registration process of a power consumption pattern 222 described later, and the power changes by turning on / off the power supply and switching the output for each device. It shows a state.

As shown in FIG. 7, the power consumption type 703 defines three types: a constant output type, a multiple output type, and an output change type. The constant output type is a device that consumes substantially constant power when the power is turned on. For example, a television corresponds to this type.
FIG. 9A illustrates a graph of power consumption of a constant output type device. The graph in FIG. 9A shows the change in power when the device is turned on and then turned off after a lapse of a certain time. The horizontal axis represents time, the vertical axis represents power, and the line 901 represents power for each hour. Represents. In the example of FIG. 9A, the power is turned on at time 904 and the power is turned off at 905. As shown in the graph, the power during the power ON period is not strictly constant, and there is some fluctuation, so this width is represented by a maximum 902 and a minimum 903. In the power consumption pattern 222 of FIG. 7, the maximum 706 and the minimum 705 correspond to this.

  A multi-output type device is a device that can switch outputs and has a plurality of power states, such as lighting with a stepwise dimming function. FIG. 9B illustrates a graph of power consumption of a multi-output type device. In the graph of FIG. 9B, the output switching operation is performed at the time point 910, and it is shown that there are two power states of 906 to 907 and 908 to 909. In the power consumption pattern 722 of FIG. 7, information on these two power states is shown in the power range 704.

  The output change type device is a device whose output is automatically switched according to changes in the surrounding environment, for example, an air conditioner that automatically adjusts the output according to the room temperature. FIG. 9C illustrates a graph of power consumption of the output change type device. As shown in FIG. 9C, in the output change type device, the power consumption changes within a range of 911 to 914, for example, during the power ON period. In the power consumption pattern 722 of FIG. 7, the output change type device is configured with information on a plurality of power states, like the multiple output type device.

  The power consumption type for each device is preset and stored in the auxiliary storage device 209 as the power consumption type correspondence table 223. FIG. 8 shows an example of a correspondence table 223 of main home appliances and their power consumption types. The power estimation apparatus 200 determines the power consumption type 703 of the electric device 104 registered by the user with reference to the correspondence table 223 during the power consumption pattern registration process described later.

  Returning to the overall processing flow of FIG. 3, the power estimation apparatus 200 displays a list of the electrical devices 104 obtained as a result of the power estimation in S302 on the display apparatus 201, and the electrical specified by the instruction input unit 202 accordingly. The device 104 is selected (S303). Next, the power estimation apparatus 200 performs a power correction process for the selected electrical device 104 (S304). FIG. 4 is a flowchart for explaining an example of the individual estimated power correction processing S304. When the process is started in S400, the estimated power correction unit 214 first refers to the power consumption pattern 222 of the device selected in S303 using the device ID associated with the current waveform pattern 221 of the device as a key ( S401). If the power consumption pattern 222 of the device is not registered, the correction cannot be made, and the estimated power correction unit 214 ends the process as it is (S402: NO). When the power consumption pattern 222 is registered (S402: YES), the estimated power correction unit 214 determines whether the power consumption pattern 222 is a constant output type (S403).

  If it is determined that the device is a constant output type (S403: YES), the estimated power correction unit 214 proceeds to the process of S404. As described above, the constant output type is a device that does not have an output adjustment function or the like only by turning the power ON / OFF and has a constant power consumption in the ON state. When the estimated power calculated in S302 is within the power range 704 recorded in the power consumption pattern 222 (S404: within range), the estimated power correction unit 214 matches the estimated power with the power consumption pattern 222. And the process is terminated without correcting the estimated power (S405).

  When it is determined that the estimated power is smaller than the registered power range, that is, when the estimated power is less than the minimum value (S404: smaller than the range), the estimated power correction unit 214 has registered the estimated power. The process is terminated after correcting to the minimum value of power (S405, S409). Here, if the value is too small, such as the estimated power is almost equal to zero, there is a possibility that an erroneous determination has been made in the power estimation process (S302). Therefore, a threshold for determining whether or not to correct the estimated power may be provided, and when the estimated power is lower than that, correction may be made to zero without performing correction to the registered power. For example, the threshold value may be set to a value of about 50% of the registered power. Further, this threshold value may be included in the power consumption pattern 222 so that a different threshold value can be set for each device.

  When it is determined that the estimated power is larger than the registered power threshold range, that is, when the estimated power is larger than the maximum value of power (S404: larger than the range), the estimated power correcting unit 214 has registered the estimated power. The power is corrected to the maximum value, and the process is terminated (S406, S409).

  Next, a case where it is determined in S403 that there are a plurality of powers registered in the power consumption pattern 222, that is, a case where it is determined that the power is not a constant output type (S403: NO) will be described. The case where there are a plurality of powers registered in the power consumption pattern 222 refers to the above-described multiple output type and output change type devices. Such devices are, for example, devices such as dryers that can switch between strong and weak, illumination with dimming function, and air conditioners that vary in power depending on the operating state.

  In this case, the estimated power correction unit 214 of the power estimation apparatus 200 checks whether the estimated power is within the range of any registered power (S407). When it determines with it being in the range of the registered electric power (S407: YES), the estimation electric power correction | amendment part 214 does not correct | amend, but complete | finishes a process (S409). When it is determined that the power is out of the registered power range (S407: NO), the estimated power correction unit 214 corrects the estimated power to the closest power among the registered powers and ends the processing (S408, S409). ). Here, the closest power is the maximum value or the minimum value in the closest power range. For example, when the closest power range is larger than the estimated power, the estimated power is corrected to the minimum value of the power range. When the closest power range is smaller than the estimated power, the estimated power is corrected to the maximum value of the power range.

  Here, as in the case of the constant output type device described above, if it is determined that the estimated power is too small, such as almost equal to zero, it is corrected to zero without performing correction to the registered power. You may make it do. For example, the threshold value may be set to a value of about 50% of the registered power. Further, this threshold value may be included in the power consumption pattern 222 so that a different threshold value can be set for each device.

  The individual power correction process (S304) described above is performed for all estimated power for each device estimated in S303. By this processing, the estimated power is corrected to a value within the range of power registered in advance for each device, and the estimated power can be prevented from being outside the range of power assumed for each device.

  Returning to the overall processing flow of FIG. 3, when it is determined that correction of all the estimated power is completed (S305: NO), the estimated power correction unit 214 of the power estimation apparatus 200 calculates the total value of the estimated power, The power of the entire system calculated from the current value measured in S301 is compared (S306). The power estimation up to this point and the correction of the estimated power are performed based on the information for each device, so that each estimated value is extremely accurate, and there is no electric device other than the electric device 104 whose power is estimated in the system. Except for cases, it is expected that an error will occur with the measured power of the entire system (hereinafter referred to as measured power). Therefore, the power estimation apparatus 200 performs correction again so that the total value of the estimated power falls within the range of the actually measured power (overall power correction process).

<Whole power correction processing>
Next, the processing content of the overall power correction processing S308 in the overall processing flow of FIG. 3 will be described. FIG. 5 illustrates a detailed flowchart of the overall power correction process. When the estimated power correcting unit 214 of the power estimating apparatus 200 starts the process in S500, first, the total value of the actually measured power at the previous measurement and the estimated power after the correction, the current actually measured power, and the estimated power are calculated. The total value is compared (S501). Assume that the total value of the actually measured power and the corrected estimated power is stored in the storage area of the auxiliary storage device 209 for an appropriate period in time series. If it is determined that there is no change in the measured power and only the estimated power has changed (S501: YES), the estimated power correction unit 214 changes compared to the previous time because there is a high possibility that an erroneous determination has occurred in the power estimation. The estimated power of the device that has been replaced with the previous estimated power (S502), and the process proceeds to S503. When it is determined that there is no change in both the measured power and the estimated power (S501: NO), the estimated power correction unit 214 similarly proceeds to the process of S503.

  Subsequently, the estimated power correction unit 214 compares the total value of the estimated power with the actually measured power. When it is determined that the actually measured power is larger than the total value of the estimated power (S503: NO), the estimated power correction unit 214 proceeds to the process of S504. When it is determined that the operating electric device 104 (the device estimated in S303) is only a device with a constant output or a plurality of outputs (S504: YES), the estimated power correction unit 214 corrects the estimated power. First, the difference between the total value of the estimated power and the system-wide measured power is processed as a component of the unregistered device (S505). In this case, the power estimation apparatus 200 displays this component as a component of other devices on the screen presented to the user. As described above, the constant output type and the multiple output type devices also have upper and lower power limits. Therefore, the difference is corrected within the range between the maximum power total value and the minimum power total value. May be.

  If it is determined in S504 that a continuous change type device is included (S504: NO), the estimated power correction unit 214 corrects the estimated power and absorbs the difference from the total power. However, if it is determined that the difference is greater than or equal to the predetermined threshold (S506: YES), it is determined that the error of the estimated power is large, and again, the correction is not performed and processed as a component of an unregistered device (S505). ).

  When it is determined that the difference is less than the threshold value (S506: NO), the estimated power correction unit 214 assigns this difference to the estimated power of the continuously changing device. Here, when there are a plurality of continuously changing devices, the estimated power correcting unit 214 obtains a ratio of estimated power between the continuously changing devices (S507), and allocates the difference power according to the ratio (S508). ). For example, if there are two continuously changing devices A and B, the estimated power of each is 50 W and 100 W, and the difference between the total value of the estimated power and the power of the entire system is 9 W, the 9 W is 1: The power of device A is corrected to 53 W, and the power of device B is corrected to 106 W at a ratio of 2.

  Here, if there is one that has reached the upper limit of the power of the device due to the difference allocation (S509: YES), the estimated power correction unit 214 does not exceed the upper limit of the power that exceeds the upper limit of the device. The process is terminated after adding to the power of other devices (S510, S515). For example, in the above-mentioned example, if the maximum value of the power of the device A is 50 W and the upper limit has already been reached, all 9 W is allocated to the device B, the power of the device A is 50 W, and the power of the device B is 109 W. Become. If there are three or more continuously changing devices and one of the allocations reaches the upper limit as a result of the allocation, the amount of power exceeding the upper limit is allocated by the estimated power ratio of the other two devices. be able to.

  Next, the case where it is determined in S503 that the actually measured power is smaller than the estimated power (S503: NO) will be described. In this case as well, similarly to S507, the estimated power correction unit 214 obtains the ratio of the estimated power of the continuously changing device (S511), distributes the difference from the measured power, and subtracts it from each estimated power. (S512). For example, if there are two continuously changing devices A and B, the estimated power of each is 50 W and 100 W, and the difference between the total value of the estimated power and the measured power of the entire system is 9 W, By subtracting from the power of each continuously changing device at a ratio of 1: 2, the power of device A is corrected to 47 W and the power of device B is corrected to 94 W.

  Here, when it is determined that the lower limit of the power of the device has been reached by the allocation of the difference (S513: YES), the estimated power correction unit 214 uses the estimated power that is below the lower limit to other devices that are not lower than the lower limit. And the processing is terminated (S514, S515). For example, in the above-mentioned example, if the minimum value of the power of the device A is 50 W and has already reached the lower limit, 9 W is allotted to the device B, the power of the device A is 50 W, and the power of the device B is 91 W. Become. If there are three or more continuously changing devices and one of the allocations has reached the lower limit, the amount of power below the lower limit is allocated by the estimated power ratio of the other two devices. be able to.

  According to the overall power correction process described above, the estimated power value can be appropriately corrected according to the actually measured power even when the total estimated power of each device is different from the overall actually measured power.

  In FIG. 11, the example of a display screen of the power estimation result by the power estimation apparatus 200 of this embodiment is shown. In the display screen example of FIG. 11, the measured power and its breakdown for each time are displayed. 1101 is a legend for each element. In the display screen example, the estimated power for each hour is displayed as a histogram according to this legend, 1102 is an air conditioner, 1103 is a television, 1104 is illumination, and 1105 is a component of other equipment. With such a power estimation result display screen, the user of the power device 104 can accurately grasp the power consumption of each device, encourage the power-off of each device, and set the appropriate operating state (for example, the air conditioner's Appropriate motivation for energy saving behavior such as temperature setting can be obtained.

<Power consumption pattern registration process>
Next, registration processing of the power consumption pattern 222 shown in FIG. 7 in the present embodiment will be described. FIG. 6 is a flowchart for explaining the process (power consumption pattern registration process S600) performed by the data registration unit 215 of the power estimation apparatus 200 when registering the power consumption pattern 222.

  In addition, since the current of each device cannot be measured by measuring the main power supply line of the distribution board 103 as shown in FIG. 1, when the power consumption pattern 222 is registered, the voltage / current measuring unit 102 is branched to the registration target device. Installed between the breaker or the outlet plug of the registration target device and the outlet, and measures the current of each electric device 104.

  The data registration unit 215 of the power estimation apparatus 200 starts the device information registration process S600 when a predetermined start operation input from the instruction input unit 202 is received, for example. The data registration unit 215 first adds a new record to the power consumption pattern 222 shown in FIG. Then, the device name registration screen is displayed on the display device 201, and the input of the device name 702 of the target electric device 104 whose power is estimated is received from the user. Further, the power consumption type 703 is selected together with the name (S601).

  There are three types of power consumption types 703: the aforementioned constant output type, multiple output type, and output change type. To select the power consumption type 703, the data registration unit 215 causes the user to present and select the correspondence table between the device type and the power consumption type shown in FIG. Alternatively, the device type / power consumption type correspondence table shown in FIG. 8 may be presented when the device name is input, and only the device type may be selected. If the device owned by the user is not in the correspondence table shown in FIG. 8, the power consumption type 703 is directly designated.

  When it is determined that the specified power consumption type 703 is a constant output type (S602: constant output type), the data registration unit 215 instructs the user to turn on / off the electric device to be registered and measures power. Let it run. Specifically, the data registration unit 215 displays on the display device 201 a screen that prompts the user to start an operation (power ON) of the electric device 104 to be registered (S603). For example, a button that is pressed when the user's operation is completed is prepared on the screen, and the user presses the OK button via the instruction input unit 202 after starting the operation of the electric device 104. can do.

  When a measurement start command is received via the instruction input unit 202 (by pressing the OK button), the data registration unit 215 starts power measurement of the registration target device. After the predetermined time measurement, the data registration unit 215 ends the measurement and displays a message on the display device 201 informing the user of the end of the measurement (S605). In the case of a constant output type device, since there is almost no fluctuation in power, the measurement time may be short (for example, about 1 minute).

  Next, the data registration unit 215 obtains a maximum value and a minimum value for the power measured in S604. As shown in FIG. 9A, the maximum value and the minimum value indicate values of maximum power 902 and minimum power 903 when the electric device is turned on. The data registration unit 215 registers this in the new record of the power consumption pattern 222 added in S601, and completes registration of the electric device 104.

  Next, registration when it is determined that the power consumption type 703 is a multiple output type (S602: multiple output type) will be described. In the case of the multi-output type, the user operates the registration target device for all outputs (operation modes), and performs power measurement and registration.

  First, as in S603, the data registration unit 215 displays a screen that prompts the user to start the operation of the electrical device 104 to be registered (S607). When receiving a measurement start command via the instruction input unit 202 (by pressing the OK button), the data registration unit 215 starts power measurement. After the predetermined time measurement, the data registration unit 215 ends the measurement and displays a message on the display device 201 informing the user of the end of the measurement (S609). Even in the case of a multi-output type device, since there is almost no fluctuation in power consumption for one output (operation mode), the measurement time can be short (about 1 minute).

  Next, the data registration unit 215 obtains a maximum value and a minimum value for the power measured in S608. The data registration unit 215 registers this as a minimum 705 and a maximum 706 of the power range 704 in the new record of the power consumption pattern 222 added in S601 (S610). In a multi-output type device, in order to register power for all outputs (operation modes), the data registration unit 215 displays a message for prompting another output operation on the display device 201, and if there is another output, Also make it execute registration. That is, the data registration unit 215 displays a registration completion button together with a message for prompting another output operation on the display device 201 to prompt the user to select (S611). When another output is selected (S611, YES), the data registration unit 215 proceeds to the process of S607. When it is determined that the user has selected the registration completion button (S611: NO), the data registration unit 215 completes registration of the device.

  Subsequently, registration when it is determined that the power consumption type 703 is the output change type (S602: output change type) will be described. In the output change type device, the output changes with time. Therefore, it is necessary to measure the power for a longer time than in the constant output type / multiple output type device and register the power change. Therefore, in the present embodiment, for the convenience of the user, when displaying a screen that prompts the user to start the operation of the registered electric device 104, a message indicating that the measurement time is relatively long is displayed. (S612). In this case, the expected measurement required time may be presented according to the type of the target device. When receiving a measurement start command via the instruction input unit 202 (by pressing the OK button), the data registration unit 215 starts power measurement (S613). After the predetermined time measurement, the data registration unit 215 ends the measurement and displays a message on the display device 201 informing the user of the end of the measurement (S614).

  Next, the data registration unit 215 performs measurement power registration in the power consumption pattern 222. In the registration of constant output type / multiple output type devices, one power (a pair of maximum power and minimum power) was registered for one power measurement. However, in the case of output change type devices, the measured power Registration is divided into a plurality of electric powers according to the bias of the histogram. In other words, the power consumption of the output change type device does not always change continuously, and the power does not take a continuous value as shown in FIG. 9C and may be biased to several power ranges. is there. This is because even if the output is variable according to environmental conditions, the device may be operated substantially according to the subdivided operation mode. In this regard, in FIG. 9C, the measured power is biased in two ranges 911 to 912 and 913 to 914. If it is such a measurement result (S615: YES), the two power ranges (maximum value / minimum value) are registered in the power consumption pattern 222.

  Whether the power consumption is biased is determined by determining a certain width, such as 10 W increments, for each measured power point, obtaining a histogram of the number of appearances for each power, and whether the distribution is biased It can be determined by whether or not. FIG. 10 shows an example of a histogram of power measured as shown in FIG. 9C. In the figure, for example, reference numeral 1005 indicates the number of times of measuring 1 W to 50 W of power. FIG. 10 shows that there are two peaks of 150 W and 400 W, and two power ranges 1001 and 1002 are extracted.

  The criteria for extracting the power range 704 of the output change type device will be described with reference to FIG. For extraction of the power range 704, threshold values of the minimum power 1003 and the minimum frequency 1004 are used, and power in a range exceeding the threshold value is extracted. The minimum power 1003 is a minimum value of power that can be practically estimated by the power estimation apparatus 200. The minimum frequency 1004 is provided to exclude power when the electric device 104 is in a transient state, and may be set to a frequency of 5% or less of the population, for example. As a result, it is possible to set a more accurate power range by eliminating measurement results obtained in a range where measurement accuracy is insufficient and in a transient state of the power range.

  However, since the maximum power throughout the power measurement period of the target device may be low and may be excluded if separated by the threshold of the minimum frequency 1004, the maximum power recording frequency is the exception as a minimum. Exclusion at the threshold of the frequency 1004 is not performed. Specifically, the maximum power is included in the power range 704 having the largest power in the extracted power range 704. In the example of FIG. 10, the number of appearances of 500 W is less than the minimum frequency (number of appearances) 1004, but is not excluded and included in the frame of the range 1002. This exception processing need not be performed.

  In this way, a certain range of power is extracted, and the maximum power and the minimum power are registered in the power range 704 of the power consumption pattern 222 (S616). In the example of FIG. 10, the range of the code 1001 is a maximum of 200 W / minimum 51 W, and the range of the code 1002 is a maximum of 500 W / minimum 301 W. When there is no bias in power (S615: NO), the data registration unit 215 registers the maximum value and the minimum value with the measured power as one power (S617).

  With the above processing, the registration of the power of one output change type electric device 104 is completed. Regardless of the constant output type, the multiple output type, or the output change type electric machine 104, when registration of one device is completed, a message is displayed to prompt the user to confirm whether another device is registered on the display device 201. In addition, a selection button is set (S618). When receiving an instruction to register another device (S618: YES), the data registration unit 215 returns to the process of S601. When it is confirmed that no other device is registered (S618: NO), the data registration unit 215 ends the process as it is (S619). According to the power consumption pattern registration process described above, it is possible to set power consumption data that enables highly accurate power estimation for a plurality of electrical devices 104 having different power consumption patterns.

Second Embodiment Next, a power estimation apparatus 200 according to a second embodiment of the present invention will be described. In the power estimation apparatus 200 of the first embodiment, the power consumption tendency of an electrical device is classified into a constant output type, a multiple output type, and an output change type, and then the estimated power based on the range of power that the device can take Correction was performed. In the present embodiment, the output change type device is corrected using the power change tendency (for example, the fineness and magnitude of the change) in addition to the power range.

  The tendency of the power change is calculated based on the power of the electric device 104 measured for a certain period of time in the power consumption pattern registration process as shown in FIG. 12A, as in the case where the power range is obtained in the first embodiment. . For this power, the change from one measurement value to the next measurement value is aggregated in a predetermined section, a power change histogram is created, and a power consumption pattern (the power consumption pattern according to this embodiment is referred to as power Registered in the consumption pattern 222B). FIG. 12B shows an example of a power change histogram. In the illustrated histogram, the horizontal axis represents the change in measured power. For example, reference numeral 1210 indicates the frequency where the change amount is 0 or more and less than 5. In addition, since the correction | amendment by the histogram of an electric power change is intended for the fluctuation | variation of a short period, the time interval which produces the histogram of an electric power change is about 1 minute-5 minutes.

  Since the power change histogram may change depending on the operation status of the electric device 104, the power measurement time of the electric device 104 at the time of power consumption pattern registration is sufficiently longer than the time interval for creating the power change histogram. As shown in sections 1204 to 1206 in FIG. 12A, a histogram of power changes in a plurality of sections is created for the measured power, and a histogram of power changes obtained by averaging these histograms is used as a power consumption pattern. It shall be registered in 222B. The sections 1204 to 1206 may be set to partially overlap each other at the start and end portions.

  FIG. 13 shows an example of the power consumption pattern 222B of the second embodiment. The device ID 1301, the device name 1302, the power consumption type 1303, and the power range 1304 are respectively the same as the power consumption pattern 222 of the first embodiment illustrated in FIG. A power change histogram 1305 is an item in which the above-described power change histogram is registered, and is provided only in an output change type device. The numerical sequence shown in FIG. 13 is obtained by alternately arranging each class (for power change) and its frequency. For example, a set of numerical values (−25, 1) indicates that the frequency of change is −25 W or more and less than −20 W is 1. In FIG. 13, it is expressed by a one-dimensional array, but it is only necessary to be able to express the relationship between the class and its frequency, and the class and the frequency may be divided and expressed by a two-dimensional array.

<Power consumption pattern registration process>
Next, the power consumption pattern registration process in this embodiment will be described. FIG. 14 is a flowchart of processing for registering the histogram of power change exemplified in FIG. 12B in the power consumption pattern registration processing in the present embodiment. The entire power consumption pattern registration process is the same as the registration process of the first embodiment described with reference to the flowchart of FIG. 6, and the process of the flowchart shown in FIG. 14 is added after S616 and S617 of FIG.

  First, the data registration unit 215 of the power estimation apparatus 200 obtains a section in which the power of the target device is ON based on the fact that the measured power is greater than or equal to a certain level (S1401). In the example of FIG. 12A, a power ON threshold 1201 is set, a section where power is equal to or higher than this threshold is set as a power ON section, and a section from the time point 1202 to the time point 1203 is selected.

  Next, the data registration unit 215 obtains a power change histogram for the section 1204 having a predetermined length (S1402). Next, the data registration unit 215 shifts the start point in order to obtain a power change histogram in the next section (S1403).

  If the end point of the power ON section has not been reached (S1404: NO), a power change histogram is calculated again for the section 1205 having a predetermined length (S1402). In this way, the histogram of the power change is calculated while shifting the section. When it is determined that the end point of the power ON section has been reached (S1404: YES), the data registration unit 215 calculates the average of each value of the histogram of the power change obtained in each section, and configures the average value of each value. A power change histogram is generated (S1405). Finally, the generated power change histogram is registered in the power change histogram (1305 in FIG. 13) of the power consumption pattern 222B (S1406), and the process ends (S1407).

<Individual power correction processing>
Next, an individual power correction process using a power change histogram will be described. FIG. 15 is a flowchart illustrating an example of individual power correction processing using a power change histogram. In the individual power correction process of the present embodiment, the estimated power is corrected so that the histogram of the power change registered in the power consumption pattern 222B and the histogram of the power change of the estimated power match or are close to each other.

  The entire individual power correction process is the same as the individual power correction process of the first embodiment described with reference to the flowchart of FIG. In the process shown in FIG. 4, the same process is performed for the multiple output type and the output change type that are NO in the step of determining whether the output type is constant (S403). However, in the present embodiment, these processes are performed separately. In the case of a multiple output type, the same processing as in the first embodiment is performed in S407 and S408. In the case of the output change type, the processing of the flowchart shown in FIG. 15 is performed instead of S407 and S408.

  When it is determined that the output change type is determined in S403, the estimated power correction unit 214 checks whether the estimated power is within one of the registered power ranges (S1501). When it is determined that it is within the registered power range (S1501: YES), the data registration unit 215 sets the power range of the power as a correction candidate. In the example of FIG. 13, assuming that the estimated power of the bedroom air conditioner is 90 W, 80 W to 115 W are correction candidates, and correction is performed to an optimum value within this range by comparing histograms of power changes described later. FIG. 16 schematically shows an example of estimated power correction. For the estimated power 1601 to be corrected, the width indicated by 1603 is a correction candidate for this estimated power. If it is out of the registered power range (S1501: NO), the estimated power correction unit 214 sets the power range of the closest power among the registered powers as a correction candidate (S1503).

  Next, the estimated power correction unit 214 calculates a histogram of the power change of the estimated power (S1504). The calculation of the histogram of the power change of the estimated power is performed for a section that goes back the same length of time as when the power change histogram was registered. In the example of FIG. 16, a histogram of the power change of the estimated power is calculated for the section 1602. The length of the section 1602 is set equal to the length of the section in which the power change histogram is calculated when the power change histogram is registered in the power consumption pattern 222B.

  Next, the calculated power change histogram and the power change histogram 1305 registered in the power consumption pattern 222B are compared to determine the frequency difference (S1505). FIG. 17 shows an example of the difference in the histogram of the power change. When the frequency is positive, it indicates that the frequency of the power change histogram registered in the power consumption pattern 222B is larger than the calculated frequency of the power change histogram. When the frequency is negative, the frequency is registered in the power consumption pattern 222B. This indicates that the frequency of the power change histogram is smaller than the calculated frequency of the power change histogram. Further, when the frequency is 0, the frequency of the power change histogram registered in the power consumption pattern 222B is equal to the frequency of the calculated power change histogram.

  Next, the estimated power correction unit 214 obtains a change between the power of the correction candidate obtained in S1502 or S1503 and the power at the previous time (S1506). As described above, assuming that 80W to 115W are correction candidates and the power obtained at the previous time point is 100W, the amount of change is -20W to 15W.

  Then, the estimated power correction unit 214 compares this change amount with the difference in the histogram of the power change illustrated in FIG. 15B, and corrects the estimated power so as to obtain the change amount having the most margin. In FIG. 17, when the frequency in the range of −20 W to 15 W is seen, the frequency of 0 W or more and less than 5 W has the largest margin. Therefore, 90 W, which is +0 W compared to the previous time, is set as the final correction power. If the frequency is the same, a class with a small change may be selected with priority.

  In this embodiment, an example is described in which correction is performed using one power change histogram 1305 for each device ID 1301, but the present invention is not limited to this, and there is a plurality of power ranges 1304 for one device ID 1301. Alternatively, a power change histogram 1305 may be provided for each power range 1304, and correction may be performed for each power range 1304.

  In addition, although the power change is represented by the power difference and its histogram, the power spectrum may be obtained by performing frequency analysis in the section in which the power change histogram is calculated, and the power change may be represented by the power for each frequency.

  According to the second embodiment described above, the estimated power can be made closer to the tendency of power consumption of the original electric device.

Third Embodiment Next, a power estimation apparatus 200 according to a third embodiment of the present invention will be described. In the present embodiment, the power consumption pattern 222 is downloaded from a data server connected via a network.

  A configuration example of the power estimation apparatus 200 according to the present embodiment is shown in FIG. The configuration of the power estimation apparatus 200 in this embodiment is substantially similar to the configuration of the power estimation apparatus 200 in the first embodiment, but includes a network interface 1801 and an external device information database 1803 via a communication network 1802. The configuration is different in that it is connected. The communication network 1802 is typically an open network such as the Internet, but may be a private network such as a LAN laid in the company. In the device information database 1803, current waveform patterns 221 and power consumption patterns 222 of various devices are registered.

  The power consumption pattern registration process of the power estimation apparatus 200 in this embodiment will be described. In the first embodiment, power measurement is performed for each electrical device 104. In the present embodiment, the device information database 1803 is input after the user is caused to input information on the device to be registered in more detail. Are searched for and downloaded from the power consumption pattern 222 of the matching device. Here, the detailed information includes the manufacturer and model number of the electric device to be registered.

  If there is no device information corresponding to the input information in the device information database 1803, registration by power measurement can be performed by the same method as the power consumption pattern registration processing in the first embodiment. Good.

  According to the present embodiment described above, since it is possible to reduce the time and effort required for registering the power consumption pattern 222 in the power estimation apparatus 200, the power estimation apparatus 200 can be made more convenient.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  Each of the above-described configurations, functions, processing units, processing steps, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.

  Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 100 AC power supply 101 Electric power supply line 102 Voltage / current measurement part 103 Distribution board 104 Electric equipment 200 Electric power estimation apparatus 201 Display apparatus 202 Instruction input part 203 I / O interface 204 Measurement input part 205 CPU
206 Memory 207 Timer 208 Auxiliary storage interface 209 Auxiliary storage device 210 Control program 211 UI control unit 212 Measurement control unit 213 Power estimation unit 214 Estimated power correction unit 215 Data registration unit 220 Stored data 221 Current waveform pattern 222 Power consumption pattern 223 Power consumption Type correspondence table

Claims (12)

In a power estimation device for receiving a current waveform and a voltage waveform measured for an electrical device that consumes one or more powers, and estimating the power consumption of the electrical device from the current waveform of the electrical device,
Based on the received data of the current waveform and voltage waveform, a power estimation unit that estimates power for each electrical device;
A holding unit for holding a power consumption pattern representing characteristics of power consumption for each of the electrical devices and a variation amount of the power consumption;
It is determined whether the power estimated by the power estimation unit matches the power consumption pattern held by the holding unit, and when it is determined that they do not match, the estimated power is corrected according to the power consumption pattern A correction unit;
A power estimation apparatus comprising: The power estimation apparatus according to claim 1,
The power consumption pattern is a constant output type in which the power consumption is considered to be constant, and a multiple output type in which the power consumption is considered to take a plurality of discrete values, for each of the electric devices for which power is to be estimated. And a power consumption type that is classified into one of the output change types in which the power consumption continuously changes according to the operating state of the electric device, and a power range that includes the maximum value and the minimum value of the power consumption. In the multiple output type and the output change type, the power range is set for each of a plurality of outputs. The power estimation apparatus according to claim 2,
The estimated power correction unit determines that the power consumption type of the electrical device is the constant output type, and the estimated power of the electrical device is smaller than a minimum value of the power range of the power consumption pattern. If so, the estimated power of the electrical device is corrected to the minimum value,
When it is determined that the power consumption type of the electrical device is the constant output type and the estimated power of the electrical device is larger than the maximum value of the power range of the power consumption pattern, A power estimation apparatus that corrects the estimated power to the maximum power. The power estimation apparatus according to claim 2,
The estimated power correction unit is configured such that the power consumption type of the electrical device is the multiple output type or the output change type, and the estimated power of the electrical device is the power consumption pattern of the electrical device. When it is determined that it is smaller than the minimum value of the smallest power range among a plurality of the power ranges, the estimated power of the electrical device is corrected to the minimum value,
The power consumption type of the electrical device is the multiple output type or the output change type, and the estimated power of the electrical device is within a plurality of the power ranges of the power consumption pattern of the electrical device. If it is determined that it is greater than the maximum value of the largest power range, the estimated power of the electrical device is corrected to the maximum value,
The power consumption type of the electrical device is the multiple output type or the output change type, and the estimated power of the electrical device is the most among the plurality of powers of the power consumption pattern of the electrical device. It is larger than the minimum value of the power range that is small, smaller than the maximum value of the power range that is the largest among the plurality of powers of the power consumption pattern of the electrical device, and which of the power consumption patterns of the electrical device When it is determined that it is not included in the power range, the estimated power of the estimated power is corrected to the power closest to the power included in the power range of the power consumption pattern of the electrical device. Power estimation device. The power estimation apparatus according to claim 1,
The estimated power correction unit compares the total value of all the estimated power obtained for the electrical device with the measured value of the total power measured by the voltage / current measurement unit, and from the total value of the estimated power, If it is determined that the measured value of the total power is large, the power consumption type is increased to the estimated power of the electric device of the output change type so that the total power and the total value of the estimated power match,
When it is determined that the measured value of the total power is smaller than the total value of the estimated power, the estimated power of the electric device whose power consumption type is the output change type is the total value of the total power and the estimated power. The power estimation apparatus reduces the estimated power of the electric device whose power consumption type is the output change type so that the power consumption type matches the power consumption type. The power estimation apparatus according to claim 5, wherein
When the estimated power correction unit determines that the power consumption type is a plurality of the electric appliances classified as the output change type and the measured value of the total power is larger than the total value of the estimated power, The estimated power is increased while maintaining the relative ratio of the estimated power obtained for the output change type electric device so that the total power and the total value of the estimated power match. When it is determined that the measured value of the total power is smaller than the total value, the relative value of the estimated power obtained for the output change type electric device so that the total power and the total value of the estimated power match. A power estimation apparatus that reduces the estimated power while maintaining a target ratio. The power estimation apparatus according to claim 5, wherein
When the estimated power correction unit determines that the total power measured by the voltage / current measurement unit is greater than a predetermined threshold by a total value of all the estimated powers output by the estimated power correction unit, the estimated power The power estimation apparatus is characterized in that the difference between the total value of the estimated power and the measured value of the total power is recorded as the power of an unregistered device. The power estimation apparatus according to claim 1,
A data registration unit for registering the power consumption pattern for each electrical device, the data registration unit,
When registering the power consumption pattern for the output change type electric device, the power measurement value measured over a predetermined time for the electric device is divided into a predetermined power value range to calculate a measurement frequency for each category. When it is determined that there are a plurality of groups having the measurement frequency exceeding a predetermined threshold, the maximum value and the minimum value of power are recorded in the power consumption pattern as the power range for each group, and the measurement exceeding the predetermined threshold is recorded. When it is determined that the frequency group is single, the power estimation apparatus records the maximum value and the minimum value of the power for the group as the power range in the power consumption pattern. The power estimation apparatus according to claim 8, wherein
The data registration unit
When registering the power consumption pattern for the output change type electric device, a power ON section, which is a section in which the power of the electric device is ON, is set on the basis that the measured power is a predetermined threshold or more. A power estimation apparatus that calculates a change in power measured for each section having a predetermined length and registers the frequency for each power change in the power consumption pattern. The power estimation apparatus according to claim 9, wherein
The estimated power correction unit
For the output change type electric device, the power retrospectively with respect to the power measurement value of the electric device to be processed for a section equal to the length of the section in which the frequency of the power change is registered in the power consumption pattern. The frequency for each change is calculated, the frequency for the registered power change is compared with the frequency for the power change calculated for the electrical device to be processed, and a difference is calculated. Calculate the amount of change between the power range selected based on the power of the device, compare the amount of change with the frequency of the power change, and calculate the estimated power so as to obtain the change with the most margin in frequency. The power estimation apparatus characterized by correcting. The power estimation apparatus according to claim 1,
The power estimation apparatus, wherein the holding unit is configured as a database installed outside the power estimation apparatus and connected via a communication network. In a power estimation method for receiving a current waveform and a voltage waveform measured for an electrical device that consumes one or more powers, and estimating the power consumption of the electrical device from the current waveform of the electrical device,
Based on the data measured by the voltage / current measurement unit, estimate the power for each electrical device,
Holding a power consumption pattern representing the characteristics of the power consumption for each electrical device and the amount of fluctuation of the power consumption,
It is determined whether the power estimated by the power estimation unit matches the power consumption pattern held by the holding unit, and when it is determined that they do not match, the power is corrected according to the power consumption pattern.
A power estimation method.

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