JP2012199726A - Meter-reading data transmission control method and program of communication unit, communication unit, and meter-reading data communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a meter-reading data transmission control method of a communication unit for transmitting meter-reading data outputted from a sensor from a communication unit and restoring the meter-reading data at a collection server, and to prevent generation of congestion in a network collecting meter-reading data from the sensor and increase in a server load.SOLUTION: A difference between a change amount of a meter-reading value notified last time and a change amount of a meter-reading value calculated on the basis of the last time meter-reading value and a this time meter-reading value, is calculated (S509-S513). When the calculated difference exceeds a predetermined threshold, meter-reading data corresponding to the meter-reading value is stored in a transmission buffer, and transmission processing is performed (S513 → S514 and S515).

Description

  The present invention relates to a meter reading data transmission control method and program of a communication unit, a communication unit, and a meter reading data communication control method for transmitting meter reading data from a sensor from a communication unit and restoring it by a collection server.

  A technique is known in which sensors having a communication unit are widely arranged, meter reading data from the sensor is transmitted from the communication unit, and collected by a server. Such technology is used, for example, in “smart grid” technology for finely controlling power demand in homes and factories. In the “smart grid” technology, power consumption areas such as homes and factories and power companies are connected by a network such as an optical fiber. Then, it is considered that the communication unit acquires a meter reading value every predetermined time (for example, 30 minutes) from the meter for displaying the amount of electricity used installed in the power consumption area, and transmits it to the server of the power company. . As a result, it is possible to rationalize and optimize power supply even when the amount of power used varies depending on the season and time zone, based on the power amount setting based on the demand peak where there was much waste.

  Here, it is usual that a large number of sensors as described above are arranged over a wide range, such as a meter reading device in a general household or factory. For this reason, meter reading data from all communication units existing in the network periodically and simultaneously flow into the network, so that the network can be in a congestion state. In order to prevent such a situation, conventionally, a technique for reducing the transmission capacity from the communication unit to the server is known. For example, in a remote monitoring control device that transmits measurement information measured by a slave station to the master station using HDLC (High-level Data Link Control procedure), the master station divides the fluctuations set for each measurement value at the start of operation. The threshold value is transmitted to each slave station, and each slave station transmits all measurement values to the master station only once when the fluctuation threshold value is received. Only the measured value exceeding the fluctuation threshold is transmitted to the master station. As a result, measurement values with little fluctuations such as voltage and integrated power value are not always transmitted, but are transmitted only during fluctuations, so that the transmission capacity is always reduced, and the transmission cycle is increased or the measurement capacity is increased by that reduction. (For example, the technique described in Patent Document 1).

Japanese Patent Application Laid-Open No. 08-195988

  However, even if the above-described conventional technology is used, for example, if a packet of meter reading measurement value is transmitted from each communication unit every predetermined time (for example, 30 minutes) from 20 million households, the network is still congested. It had the problem that it ended up. In addition, there is a problem in that the load on the server that processes the data becomes large.

  An object of the present invention is to prevent the occurrence of congestion and an increase in server load in a network that collects meter reading data from sensors.

  In one example, the meter reading data is notified from the communication unit to the meter reading data collecting side, the amount of change in the meter reading value notified last time, and the change in the meter reading value calculated from the previous meter reading value and the current meter reading value. When the calculated difference exceeds a predetermined threshold, the current meter reading value and the data for giving the previous meter reading value are transmitted.

It is possible to prevent the occurrence of congestion and the increase in server load in the network for collecting meter reading data from the sensors.
In addition, it is possible to accurately restore the change in the amount of power during the time period when communication data is not received on the server side.

It is a network block diagram of a meter-reading system. It is a figure which shows the example of electric energy, electric power change amount, and a restoration graph. It is a block diagram of a communication unit. It is a block diagram of a collection server. It is a flowchart of a communication unit. It is a flowchart of a collection server. It is explanatory drawing of restoration operation | movement of the electric energy in embodiment. It is explanatory drawing in the case where the period using much electric power and the period using little are the same with respect to the inclination estimated initially. It is explanatory drawing when the period which used many electric power is longer than the period which used few electric power with respect to the inclination estimated initially. It is explanatory drawing when the period which used less electric power is longer than the period which used much electric power with respect to the inclination estimated initially. It is explanatory drawing at the time of using much more electric power with respect to the inclination estimated initially. It is explanatory drawing at the time of using much less electric power with respect to the inclination estimated initially. It is a more detailed comparative explanatory drawing in the case of this embodiment and the case where a change amount is not sent. It is a block diagram of the hardware system which can implement | achieve the system of this embodiment.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a network configuration diagram of a meter reading system to which the present embodiment is applied. Communication units 101 connected to, for example, a meter-reading meter of an electric meter such as a general home or factory are connected to each other by, for example, a wireless (or wired) ad hoc network. The ad hoc network is a self-supporting distributed network that operates to maintain a mutual connection while searching for adjacent communication units 101 to which the mutual communication units 101 can be connected even when a failure occurs. A predetermined unit of these communication units 101 operates as a gateway (GW) 102. The GW 102 is connected to an external network such as a LAN (local area network) or a WAN (wide area network) outside the ad hoc network. Then, the GW 102 relays data communication between the server 103 and each communication unit 101 connected to the external network by, for example, a wire. At this time, the GW 102 also converts the communication format of the packet data between the communication protocol of the external network, for example, IP (Internet protocol) and the communication protocol of the ad hoc network.

  In the present embodiment, in order to avoid network congestion, an increase in server load, and an increase in the number of necessary servers, which are problems of the conventional method, the following method is adopted. Instead of the conventional method of regularly reading meter reading information from each point of power consumption, each power consumption point individually monitors changes in the amount of change in power consumption, and within a certain threshold If it is within the range, the meter reading value information is not transmitted. In addition, each communication unit accumulates data to be transmitted for avoiding network congestion, for example, for one day, and transmits the data collectively at the next transmission timing determined for each unit in advance.

  Specifically, in the communication unit, the amount of power (kWh) is acquired from the meter reading device, and the amount of power change per unit time (slope) (kW) is calculated from the amount of power and the amount of power acquired 30 minutes ago. To do. And a communication unit will not transmit meter-reading value information, if the difference of the electric energy variation | change_quantity and the electric energy variation | change_quantity notified last time is in the predetermined threshold range. Furthermore, when the communication unit transmits meter reading value information, it can restore the power amount with less error on the server side by sending the power amount change amount at that time together with the conventional power amount and meter reading time. It becomes.

  FIG. 2 shows an example of a graph of power consumption at a certain home, a graph obtained by obtaining it with a communication unit and calculating a power amount change amount, and a graph (server side) that receives meter-reading value information and restores the power amount. FIG.

  Hereinafter, the method of this embodiment will be described with reference to FIG. 2 by taking the daily power consumption of a general household as an example. In FIG. 2, (a) is the electric energy graph which a meter-reader shows, (b) is an electric power change amount graph, (c) is an electric energy restoration graph. The time timing indicated by “x” in FIG. 2A is a timing that is not a server notification target, and the time timing indicated by “◯” in FIG. 2A is a server notification target timing. In each band-shaped region shown in FIG. 2B, the central horizontal line of each region is the previous change amount, and the upper and lower bands of the central horizontal line are the difference between the current change amount and the previous change amount within the threshold range. . A dotted line shown in FIG. 2C is a graph of the restored electric energy.

Hereinafter, the method of this embodiment will be described with reference to FIG. 2 taking the daily power consumption of a general household as an example (1) 03:00.
The communication unit acquires the meter reading value from the meter meter. (The meter reading value = 500 kWh)
The communication unit determines that the meter reading value is 500 kWh and the meter reading time is a server notification target.
Notification of the first meter reading is unconditionally confirmed.

(2) 03:30
The communication unit acquires the meter reading value from the meter meter. (The meter reading value = 510 kWh)
The communication unit calculates a meter reading change amount from the previous meter reading value, and determines the value, meter reading value 510 kWh, and meter reading time as a server notification target.
Meter reading change (inclination) = (510−500) [kWh] /0.5 [h] = 20 [kW]

(3) 04:00
The communication unit acquires the meter reading value from the meter meter. (The meter reading value = 520 kWh)
The communication unit calculates the amount of change in meter reading value from the previous meter reading value.
Meter reading change amount = (520−510) [kWh] /0.5 [h] = 20 [kW]

Since the difference (in this case, 0) from the meter reading change amount notified last time is within the threshold value, it is determined that the server notification is not targeted, and meter reading value information is not transmitted.
However, the information itself is stored in the communication unit, and is prepared for a meter reading value information acquisition request at the time designation from the server.
In this example, the threshold value is ± 30 kW.

(4) 04: 30-06: 00
The meter reading value change amount during this period (A period) is within the threshold as shown in the power amount change amount graph of FIG. 2B, so the meter reading value information is not subject to server notification and is not transmitted. .

(5) 06:30
The communication unit acquires the meter reading value from the meter meter. (The meter reading value = 590 kWh)
The communication unit calculates the amount of change in the meter reading value with the previous meter reading value (560 kWh).
Meter reading change amount = (590−560) [kWh] /0.5 [h] = 60 [kW]

  Since the difference from the previously notified meter reading change amount (20 kW) is 40 (kW) and exceeds the threshold (± 30 kW), the communication unit sends the meter reading value (590 kWh), the amount of change (60 kW) and the meter reading time to the server. Judged as server notification target.

  At this time, in order to avoid network congestion, each communication unit accumulates the data to be transmitted for one day, and collects the accumulated data at the next transmission timing determined in advance for each unit. Send. Now, for example, if there are 1000 communication units, the transmission timing is 86.4 seconds (24 × 60 × 60/1000 units) obtained by dividing 24 hours by 1000 units. For each ID, it is determined which transmission possible period. More specifically, for example, starting from 2 am every day, the transmission start time of each communication unit is determined as “2:00 am + 86.4 seconds × serial number corresponding to ID”.

The server restores the power amount graph as shown in FIG. 2C from the newly received meter reading value information (the meter reading value, the meter reading change amount, and the meter reading time) and the meter value information notified last time.
In this way, the communication unit obtains the electric energy from the meter reader at every meter reading time, and obtains the electric energy change amount from this and the previous electric energy. And a communication unit will not transmit meter-reading value information, if the difference of the electric energy variation | change_quantity and the electric energy variation | change_quantity notified last time is settled in the threshold value. On the server side, the electric energy graph can be restored only from the meter reading value information notified.

  Conventionally, it is a method of notifying server of meter reading value information in real time, but in the method of this embodiment, meter reading value information for one day of server notification is distributed and transmitted within the transmission timing of the next day. It is a method to do. The use of the power consumption amount restoration graph at the server in the power network (smart network) is for statistically grasping the power demand of the entire power network in order to determine the power generation amount in the future, and real-time property is not necessary.

  In the present embodiment, the communication unit transmits not only the current meter reading value and the current meter reading time acquired from the meter meter, but also the amount of change in the meter reading value between the current meter reading value and the previous meter reading value to the server. The current meter reading value is a significant change from the previous meter reading value. Therefore, when the server tries to interpolate and restore the meter reading value in the unreported range based on the received meter reading value and the meter reading value received before that, the interpolation including the large change is performed. Resulting in. For this reason, the error of the restored meter reading value may become large. Therefore, in the present embodiment, the communication unit transmits the amount of change in the meter reading value between the current meter reading value and the previous meter reading value in the portion that has changed significantly. Then, the server first restores the previous meter reading value immediately before the large change by subtracting the received meter value change amount from the received current meter reading value. The restoration error can be reduced by interpolating and restoring the meter reading values in the unreported range based on the restored previous meter reading value and the meter reading value received before that.

  Furthermore, in the present embodiment, it is possible to accurately grasp the range of the restoration error of the power consumption amount restoration graph, and if the maximum error is large enough to affect the above purpose of use, it is set for each communication unit. The threshold value that has been set can also be changed by a request from the server. Furthermore, if you want to determine the error part, the meter reading value information is accumulated in each communication unit regardless of whether the server notification target is non-target, so the meter reading value information is acquired by requesting the time designation from the server. You can also

FIG. 3 is a configuration diagram of the communication unit in the present embodiment.
The communication unit 301 in FIG. 3 corresponds to the communication unit 101 in FIG.
The communication unit 301 is connected to an individual meter-reading meter 310, and includes a meter-reading management function unit 302, a meter-reading meter interface 308, and a wireless transmission / reception control unit 309. The meter-reading meter interface 308 inputs the meter-reading meter value detected by the meter-reading meter 310 to the meter-reading management function unit 302. The wireless transmission / reception control unit 309 transmits or receives communication data to / from a collection server 401 shown in FIG. 4 (corresponding to the server 103 shown in FIG. 1), which will be described later, via the adjacent communication unit 301 via the bucket relay system. Is output or input to the meter-reading management function unit 302.

  The meter reading management function unit 302 includes a meter reading value register unit 303, a change amount register unit 304, and a threshold determination / register unit 305 that function as a difference calculation unit. The meter-reading management function unit 302 includes a data accumulation / meter-reading value / change amount transmitting unit 307 that functions as a transmission control unit. Further, the meter reading management function unit 302 includes a meter reading time monitoring / transmission time monitoring unit 306.

  The meter reading value register unit 303 inputs a meter reading meter value input at a meter reading time every predetermined time (for example, 30 minutes) from the meter reading meter 310 via the meter meter interface 308. Then, the current meter reading value held in the internal register until now is set in the internal register as the previous meter reading value, and the newly input meter reading value is set in the internal register as the current meter reading value.

  The change amount register unit 304 sets the current change amount held in the internal register so far as the previous change amount in the internal register at each meter reading time. Then, the amount of change between the current meter reading value newly set in the meter reading value register unit 303 and the previous meter reading value is calculated, and is newly set in the internal register as the current amount of change.

  The threshold determination / register unit 305 calculates the difference between the current change amount newly set in the change amount register unit 304 and the previous change amount at each meter reading time. Then, it is determined whether or not the difference is within the range between the upper limit value (if the difference is a positive value) and the lower limit value (if the difference is a negative value) held in the internal register. . The threshold determination / register unit 305 stores the meter reading time and meter reading value register unit 303 in the transmission buffer in the data accumulation / meter reading value / change amount transmitting unit 307 only when the difference is not within the threshold range. The current meter reading value and the current change amount in the change amount register unit 304 are written. The threshold determination / register unit 305 does not write data to the transmission buffer when the difference is within the threshold range. However, the threshold determination / register unit 305 writes the current meter reading time and the current meter reading value held by the meter reading value register unit 303 in another data buffer in the data accumulation / meter reading value / change amount transmitting unit 307. The threshold value is received from the collection server 401 of FIG. 4 to be described later via the wireless transmission / reception control unit 309, and is set in a register inside the threshold determination / register unit 305.

  The data storage / meter reading / change amount transmission unit 307 wirelessly transmits and receives a set of the meter reading time, the meter reading value, and the amount of change accumulated in the transmission buffer at every predetermined transmission time (for example, 2:00 every day). It transmits toward the collection server 401 of FIG. 4 mentioned later via the control part 309. FIG. These data are assembled into one or more packet data and transmitted. When data is not accumulated in the transmission buffer, transmission at the transmission time is not performed. Further, the data accumulation / meter reading value / change amount transmitting unit 307 responds to the meter reading value requesting the meter reading time from the collection server 401 in FIG. 4 to be described later, and the corresponding meter reading time and meter reading value in the data buffer. Can be transmitted to the collection server 401.

  The meter reading time monitoring / transmission time monitoring unit 306 monitors the meter reading time timer interrupt every predetermined time (for example, 30 minutes) described above, and notifies the meter reading value register unit 303 of the occurrence of the meter reading time timer interrupt. Further, the meter reading time monitoring / transmission time monitoring unit 306 monitors the meter reading value transmission waiting timer interrupt at the predetermined transmission time (for example, 2:00 every day), and detects the occurrence of the meter reading value transmission waiting timer interrupt as data accumulation / meter reading value / The change amount transmission unit 307 is notified.

FIG. 4 is a configuration diagram of the collection server in the present embodiment.
The collection server 401 in FIG. 4 corresponds to the server 103 in FIG.
The collection server 401 includes a power amount variation monitoring function unit 402, a wired transmission / reception control unit 408, and a power amount graph generation / correction unit 409. The wired transmission / reception control unit 408 transmits communication data to / from each communication unit 301 (FIG. 3) in the ad hoc network received or transmitted to the connected wired network to the power fluctuation monitoring function unit 402. Input or output.

  The power amount fluctuation monitoring function unit 402 includes a data reception unit determination unit 403 and a meter reading value / change amount data storage unit 404 that function as a meter reading data reception storage unit. The power amount variation monitoring function unit 402 includes a power change amount calculation unit 405 and a power amount restoration / predicted slope correction unit 406 that function as a meter reading value calculation restoration unit. Furthermore, the power amount variation monitoring function unit 402 includes a threshold value change instruction unit 407.

The data reception unit determination unit 403 determines the communication unit 301 (FIG. 3) in the ad hoc network that has transmitted the data received by the wired transmission / reception control unit 408.
The meter reading value / change amount data accumulating unit 404 sets the meter reading value, the meter reading value, and the amount of change received by the wired transmission / reception control unit 408 for each communication unit 301 determined by the data receiving unit determining unit 403. / It accumulates in the variation data accumulation unit 404.

  The power change amount calculation unit 405 is activated at a predetermined power amount correction timing (for example, a predetermined time on a day when one data reception from all 1000 communication units 301 is completed). The power change amount calculation unit 405 executes the following process for each communication unit 301 when data is stored in the meter reading value / change amount data storage unit 404 for each communication unit 301. First, the power change amount calculation unit 405 stores the current meter reading time, the current meter reading value, and the current change amount held in the internal register as the previous meter reading time, the previous meter reading value, and the previous change amount in the same internal register. set. Next, the power change amount calculation unit 405 reads a set of meter reading time, meter reading value, and amount of change from the meter reading value / change amount data storage unit 404 in order from the oldest meter reading time, and the current meter reading time, the current meter reading value, and the current meter reading time, respectively. As an amount of change, it is set in an internal register.

  Subsequently, based on the register values calculated by the power change amount calculation unit 405, the power amount restoration / predicted slope correction unit 406 reads the meter reading value at the meter reading time one time before the current meter reading time (for example, 30 minutes before). To restore. Subsequently, the power amount restoration / predicted slope correction unit 406 corrects the slope of the detected value from the previous meter reading time to the meter reading time immediately before the current meter reading time based on the register values. Furthermore, the electric energy restoration / predicted slope correction unit 406 calculates a meter reading value at each meter reading time that is not notified (every 30 minutes) between the meter reading time immediately before the previous meter reading time and the current meter reading time. The power amount restoration / predicted slope correction unit 406 outputs each meter reading value from the previous meter reading time to the current meter reading time restored as described above to the power amount graph generation / correction unit 409 together with the corresponding meter reading time. To do.

  The processes of the power change amount calculation unit 405 and the power amount restoration / prediction inclination correction unit 406 described above exist in the meter reading value / change amount data storage unit 404 for each communication unit 301 at one power amount correction timing. Repeatedly as long as As a result, in the power amount graph generation / correction unit 409, for example, for each communication unit 301, a set of meter reading times and meter reading values for one day corresponding to one power amount correction timing is restored.

  The power amount graph generation / correction unit 409 is provided for each communication unit 301 based on, for example, a set of meter reading times and meter reading values for one day obtained corresponding to one power amount correction timing for each communication unit 301. Generate an energy graph for.

  The threshold value change instruction unit 407 transmits threshold value data to some or all of the communication units 301 when it is determined that there is a large error in the statistical value of the meter reading value on the collection server 401 side. In the communication unit 301 of FIG. 3, the threshold value determination / register unit 305 receives threshold data from the collection server 401 and sets it in an internal register.

Next, FIG. 5 is a flowchart showing a control operation of the communication unit metering management process executed by the metering management function unit 302 of the communication unit 301 having the configuration of FIG.
First, a meter reading value transmission waiting timer (not shown) in the communication unit 301 is set (step S501).

  Next, it is determined from the meter reading time monitoring / transmission time monitoring unit 306 in FIG. 3 whether or not an event of meter reading time timer interruption or meter reading value transmission waiting timer interruption has occurred (step S502).

If it is determined in step S502 that the first meter reading time timer interrupt has occurred since the communication unit 301 started operation, the following processing is executed.
First, the meter reading value input from the meter reading meter 310 via the meter meter interface 308 is set in the internal register as the current meter reading value in the meter reading value register unit 303 of FIG. 3 (step S503).

  Next, the threshold judgment / register unit 305 in FIG. 3 sets the current meter reading time (current time) and the current meter reading value obtained in step S503 as the data accumulation / meter reading value / change amount transmission in FIG. The data is written in the transmission buffer in the unit 307 (step S504). By the writing operation to the transmission buffer, the meter reading value at the first meter reading time timer interruption is always transmitted to the collection server 401 (FIG. 4).

Thereafter, the process returns to the event determination process in step S502.
If it is determined in step S502 that the second meter reading time timer interrupt has occurred since the communication unit 301 started operation, the following processing is executed.

First, in the meter reading value register unit 303 in FIG. 3, the current meter reading value held in the internal register so far is set in the internal register as the previous meter reading value (step S505).
Next, the meter reading value register unit 303 sets the newly input meter reading value as the current meter reading value in the internal register (step S506).

Next, the change amount register unit 304 in FIG. 3 calculates a change amount between the current meter reading value and the previous meter reading value newly set in the meter reading value register unit 303, and newly sets the change amount in the internal register as the current change amount. (Step S507). More specifically, calculation based on the following equation (1) is executed.
Current change amount = (current meter reading value−previous meter reading value) / (meter reading time interval) (1)
Here, the meter reading time interval is a time interval (for example, 30 minutes) of meter reading time timer interruption.

  Next, the threshold value determination / register unit 305 in FIG. 3 sets the current meter reading time, the current meter reading value obtained in step S506, and the current change amount obtained in step S507 as the data accumulation / metering value in FIG. / The change amount is written in the transmission buffer in the transmission unit 307 (step S508). By the writing operation to the transmission buffer, the meter reading value and the change amount at the time of the second meter reading time timer interruption are always transmitted to the collection server 401 (FIG. 4).

Thereafter, the process returns to the event determination process in step S502.
If it is determined in step S502 that the third and subsequent meter reading time timer interrupts have occurred since the communication unit 301 started operation, the following processing is executed.

First, in the meter reading value register unit 303 in FIG. 3, the current meter reading value held in the internal register so far is set in the internal register as the previous meter reading value (step S509).
Next, the meter reading value register unit 303 sets the newly input meter reading value as the current meter reading value in the internal register (step S510).

Next, in the change amount register unit 304 of FIG. 3, the current change amount held in the internal register so far is set in the internal register as the previous change amount (step S511).
Next, the amount of change between the current meter reading value newly set in the meter reading value register unit 303 and the previous meter reading value is calculated by the change amount register unit 304, and is newly set in the internal register as the current amount of change ( Step S512). More specifically, the calculation based on the above-described equation (1) similar to the case of step S507 is executed.

Next, threshold determination is performed by the threshold determination / register unit 305 of FIG. 3 (step S513). More specifically, the difference between the current change amount newly set in the change amount register unit 304 and the previous change amount is calculated. If the difference is a positive value, it is next determined whether or not the difference is larger than the upper limit value of the threshold value held in the internal register (= the threshold value itself being a positive value) according to equation (2). .
(Threshold upper limit value) <{(current change amount) − (previous change amount)} (2)
On the other hand, if the difference is a negative value, it is then less than the lower limit value of the threshold value held in the internal register (= a value obtained by adding a negative sign to the threshold value that is a positive value) according to equation (3). It is determined whether or not.
{(Current change amount) − (Previous change amount)} <(Threshold lower limit value) (3)

  If the threshold value determination / register unit 305 determines YES in Formula (2) or Formula (3) above, the current meter reading time, the current meter reading value obtained in Step S510, and Step S512 are determined. The obtained current variation set is written to the transmission buffer in the data accumulation / metering value / variation transmission unit 307 in FIG. 3 (step S513 → step S514). Only when the difference between the current change amount and the previous change amount exceeds the threshold range by the write operation to the transmission buffer, the meter reading value and the change amount at the current meter reading time are transmitted to the collection server 401 (FIG. 4). Will be. Thereafter, the process returns to the event determination process in step S502.

  If the threshold value determination / register unit 305 determines NO in the expression (2) or (3), the process returns to the event determination process in step S502 without writing data to the transmission buffer. In this way, when the difference between the current change amount and the previous change amount is within the threshold range, the current meter reading value and the change amount are not transmitted to the collection server 401. Although not shown in FIG. 5, as described above, the threshold determination / register unit 305 stores the current meter reading time and meter reading value in another data buffer in the data accumulation / meter reading value / change amount transmitting unit 307. The current meter reading value held by the register unit 303 is written. Thereafter, the process returns to the event determination process in step S502.

  As described above, while the process of preparing meter reading information to be transmitted is repeated, if it is determined in step S502 that a meter reading value transmission wait timer interrupt has occurred, the following process is executed.

First, in the data accumulation / meter reading / change amount transmission unit 307 in FIG. 3, the data sets accumulated in the internal transmission buffer are collectively sent to the collection server 401 (FIG. 4) via the wireless transmission / reception control unit 309. Is transmitted (step S515).
Then, a meter reading value transmission waiting timer (not shown) in the communication unit 301 is reset (step S516). Thereafter, the process returns to the event determination process in step S502.

  As described above, from the communication unit 301 (FIG. 3) to the collection server 401 (FIG. 4), of the meter reading value and the amount of change detected at each meter reading time (for example, 30 minutes), Only the meter reading value and the amount of change at the meter reading time when the difference of the previous amount of change exceeds the threshold range are transmitted. In the meter reading operation in each communication unit 301 in the power network (smart network), the difference in the amount of change in the meter reading value, that is, the secondary differential value of the meter reading value hardly changes throughout the day. For this reason, the communication charge from each communication unit 301 to the collection server 401 is greatly reduced by transmitting only the meter reading value and the amount of change at the meter reading time when the difference between the current change amount and the previous change amount exceeds the threshold range. It becomes possible to do.

FIG. 6 is a flowchart showing a control operation of the collection server power amount fluctuation monitoring process executed by the power amount fluctuation monitoring function unit 402 of the collection server 401 having the configuration of FIG.
First, a power amount correction timer (not shown) in the collection server 401 is set (step S601).

Next, it is determined whether any event of meter reading data reception interruption or electric energy correction timer interruption has occurred (step S602).
If it is determined in step S602 that an interruption in meter reading data reception is generated from the wired transmission / reception control unit 408 in FIG. 4, the following processing is executed.

  First, the data reception unit determination unit 403 in FIG. 4 determines the communication unit 301 (FIG. 3) in the ad hoc network that has transmitted the data received by the wired transmission / reception control unit 408 (step S603).

  The meter reading time received by the wired transmission / reception control unit 408 in the internal buffer queue corresponding to the communication unit 301 determined by the data receiving unit determination unit 403 in the meter reading value / change amount data storage unit 404 of FIG. A set of meter reading value and change amount is stored (step S604).

Thereafter, the process returns to the event determination process in step S602.
By repeating the above processing, for example, at the predetermined time of the day when one data reception from each of all 1000 communication units 301 is completed, it is determined in step S602 that an electric energy correction timer interrupt has occurred. Then, the following series of processing is executed.

  First, the power change amount calculation unit 405 in FIG. 4 determines whether or not data is stored in the buffer queue in the meter reading value / change amount data storage unit 404 for each communication unit 301 (step S605).

  If the determination in step S605 is YES, the power change amount calculation unit 405 stores the current meter reading time, the current meter reading value, and the current amount of change stored in the internal register in the same register as the previous meter reading time and the previous meter reading value. And saved as the previous change amount (step S606).

  Next, in the power change amount calculation unit 405, a set of meter reading time, meter reading value, and change amount is read from the buffer queue in the meter reading value / change amount data storage unit 404 in order from the oldest meter reading time. The current meter reading value and the current change amount are set in an internal register (step S607).

Next, the meter reading time one time before the current meter reading time (for example, thirty minutes before) based on each register value calculated by the power amount restoring / predicting slope correcting unit 406 in FIG. The meter reading value is restored (step S608). More specifically, the calculation of the following equation (4) is executed.
(Measurement value 30 minutes before the current meter reading time) = (Current meter reading value)-(Current variation)
... (4)

Subsequently, the power amount restoration / predicted slope correction unit 406 corrects the slope of the detected value from the previous meter reading time to the meter reading time immediately before the current meter reading time based on the register values (step S609). . More specifically, the following equation (5) is calculated.
(Slope after correction) =
{(The meter reading value 30 minutes before the current meter reading time)-(Previous meter reading value)}
/ {(The meter reading time 30 minutes before the current meter reading time) − (the previous meter reading time)}
... (5)

Further, the power amount restoration / predicted slope correction unit 406 calculates a meter reading value at each meter reading time (every 30 minutes) between the previous meter reading time and the meter reading time immediately before the current meter reading time (every 30 minutes). Step S610). More specifically, the following equation (6) is calculated.
(Unreported meter reading value) =
{(Unreported meter reading time)-(Previous meter reading time)} x (Slope after correction) + (Previous meter reading value)
... (6)
The calculation of the unnotified meter-reading value by the above equation (6) is executed for all unnotified meter-reading times between the previous meter-reading time and the meter-reading time immediately before the current meter-reading time.

  Each meter reading value from the previous meter reading time to the current meter reading time restored in steps S608 and S610 is output to the power amount graph generation / correction unit 409 in FIG. 4 together with the corresponding meter reading time.

  The processes of the power change amount calculation unit 405 and the power amount restoration / prediction inclination correction unit 406 described above exist in the meter reading value / change amount data storage unit 404 for each communication unit 301 at one power amount correction timing. As long as this is done, it is repeatedly executed (steps S610 → S605).

  If it is determined in step S605 that the buffer queue in the meter reading value / change amount data storage unit 404 has become empty, the power amount correction timer is set again in order to detect the next power amount correction timing (step S605). S611). Thereafter, the process returns to the event determination process in step S602.

  As a result of the above processing, the power amount graph generation / correction unit 409 in FIG. 4 restores, for each communication unit 301, for example, a set of meter reading times and meter reading values for one day corresponding to one power amount correction timing. Will be.

  The reason why the meter reading change amount is transmitted together with the meter reading time and the meter reading value will be described below. Consider a case where the difference in the meter reading value change amount is within the threshold but close to the threshold. FIG. 7 is an explanatory diagram of a power amount restoring operation in the embodiment, where (a) is a power amount graph indicated by the meter detector, (b) is a power change amount graph, and (c) is a power amount restoring graph. The time timing indicated by “x” in FIG. 7A is a timing that is not a server notification target, and the time timing indicated by “◯” in FIG. 7A is a server notification target timing. In addition, 701a of Fig.7 (a) is an electric energy graph which a meter-reader shows, and 701b overlaps the electric energy restoration graph of FIG.7 (c). Further, in each band-shaped region shown in FIG. 7B, the difference between the current change amount and the previous change amount in which the central horizontal line of each region is the previous change amount, and the upper and lower bands of the central horizontal line are within the threshold range. It is. A dotted line shown in FIG. 7C is a graph of the restored electric energy.

(1) Assume that a period in which the difference in the meter reading value change amount is just below the threshold, as in the period A of the power change amount graph of FIG.
(2) Although the meter reading value information is subject to server notification at the timing of 06:30, if the meter reading value change amount is not notified here, the server determines that the power amount is based on the previous change amount until immediately before the notification timing. Predict the power change graph. As a result, the server predicts a considerably smaller change, as indicated by 702b, in spite of the fact that the power has actually changed by a much larger change amount than the previous change amount. Then, as soon as a large change occurs at the notification timing, the server sets the slope of α in FIG. 7 (c) in an attempt to match the notified meter reading value, and the actual amount of power change The difference of becomes large. As a result, the power change amount restoration graph is deviated from the actual power change amount of 701a in FIG. 7A, as indicated by 701b in FIG. 7A.

(3) In contrast, in the present embodiment, the server also notifies the meter reading value change amount at the timing of 06:30, so that the server obtains the meter reading value at the meter reading time immediately before the current meter reading time (current meter reading value− This time, the amount of change can be calculated. As a result, the slope of the graph from the previous meter reading time to the meter reading time immediately before the current meter reading time is corrected as indicated by 702a in FIG. 7C, and it is possible to absorb the difference from the actual power amount change amount. Become.

  As described above, in this embodiment, by notifying the server of the power amount gradient together with the power amount, it is possible to restore the power amount change of the communication unit (slave station) almost accurately on the server side.

Next, it is considered whether restoration is possible even in the case of the threshold.
Case 1 : When the period of using a large amount of power and the period of using a small amount are the same as the notified power FIG. 8 shows a period of using a large amount of power and a period of using a small amount with respect to the slope that was initially predicted. It is explanatory drawing in case where is the same. 8A, 8B, and 8C, as in FIG. 7B, in each band-shaped area, the central horizontal line of each area is the previous change amount, and the bands above and below the central horizontal line are the threshold values. This is the difference between the current change amount and the previous change amount within the range. 801a and 801b are cases where more power is used than the power notified by the latest notification information, and 802a and 802b are cases where less power is used. 803 in FIG. 8C and FIG. 8D is a power amount restoration graph restored by the present embodiment. In FIG. 8D, 804 and 805 are actual electric energy graphs corresponding to the cases of FIGS. 8A and 8B, respectively. Reference numerals 806 and 807 denote error ranges (upper limit value and lower limit value) defined by threshold values. A power amount restoration graph 808 is restored when the change amount is not notified.

  First, FIG. 8A shows a case where a large amount of power is first used within a range not exceeding the threshold value as 801a, and then a small amount of power is used as 802a and finally the power exceeding the threshold value is used. The actual power consumption graph corresponding to this case is 804 in FIG.

  Next, FIG. 8B shows a case where power is initially used as a low power as 802b, then is used as a high power as 801b, and power exceeding a threshold is used last. The actual power consumption graph corresponding to this case is 805 in FIG.

  In FIG. 8C and FIG. 8D, reference numeral 803 represents a restoration graph on the server side according to the present embodiment. In a state where the power consumption is constant, the restored power consumption 803 is restored as a straight line in the middle same as the actual power consumption.

  The graph shown in FIG. 8D shows a diagram in which the power amount is restored on the server side from the actual meter reading time, the meter reading value of the power amount, and the amount of change that is the slope of the power amount. Are sent to the server. There is no change in the graph while using within the range that does not exceed the threshold. If the power usage suddenly increases and the slope exceeds the threshold at a certain time, the communication unit of the slave station makes a slope from the power before the change and the power when the threshold is exceeded. The server calculates and notifies the server of the amount of change, which is the slope of the electric energy, together with the meter reading time and the meter reading value of the electric energy. Thereby, on the server side, the graph 803 in FIG. 8D is restored. However, since the threshold control is used, the error range is within the lines 806 and 807. In the present embodiment, the restored graph 803 deviates from the actual power amount graph 804 or 805. However, this is within the error range of 806 or 807, and the error can be reduced by reducing the threshold value. That is, the threshold value change instruction unit 407 in the collection server 401 in FIG. 4 can transmit the threshold data to the threshold value determination / register unit 305 in each communication unit 301, thereby controlling the error range. .

  In such a case, even if the change amount is not notified, a graph almost equivalent to the case of the present embodiment is obtained as indicated by 808 in FIG. 8D.

Case 2: When the period of using a large amount of power is longer than the period of using a small amount of power with respect to the notified power FIG. 9 shows that the period of using a large amount of power is less than the initial predicted slope. It is explanatory drawing when it is longer than the period which used electric power. 9A, 9B, and 9C, as in FIG. 7B, in each band-like area, the central horizontal line of each area is the previous change amount, and the upper and lower bands of the central horizontal line are the threshold values. This is the difference between the current change amount and the previous change amount within the range. Reference numerals 901a, 901b, 901c, and 901d indicate that more power is used than the power notified by the latest notification information, and 902a and 902b indicate that less power is used. Reference numerals 903 in FIG. 9D and FIG. 9E are electric power restoration graphs restored by the present embodiment. In FIG.9 (e), 904, 905, and 906 are the actual electric energy graphs corresponding to the case of Fig.9 (a), (b), and (c), respectively. Reference numerals 907 and 908 denote error ranges (upper limit value and lower limit value) defined by threshold values. Reference numeral 909 denotes a power amount restoration graph that is restored when the change amount is not notified.

  First, FIG. 9A shows a case where power is first used in a range that does not exceed the threshold value as 901a and then used for a short time as 902a, and power that exceeds the threshold value is used last. The actual power consumption graph corresponding to this case is 904 in FIG.

  Next, FIG. 9B shows a case where power is used as 902b for a short time, then used as a long time as 901b, and finally power exceeding the threshold is used. The actual power consumption graph corresponding to this case is 905 in FIG.

  Next, FIG. 9 (c) shows a case in which a power slightly higher than that of the first prediction is used, 901c is used a little longer and power exceeding the threshold value is finally used. The actual power consumption graph corresponding to this case is 906 in FIG.

  9D and 903 in FIG. 9E represent a restoration graph on the server side according to the present embodiment. It is restored so that it is used slightly more in the range not exceeding the threshold from the beginning.

  In the graph shown in FIG. 9 (e), as in FIG. 8 (d), the power amount is restored on the server side from the actual meter reading time, the meter reading value of the power amount, and the amount of change that is the slope of the power amount. In the figure, the first two data from the start of measurement are notified to the server. There is no change in the graph while using within the range that does not exceed the threshold. If the power usage suddenly increases and the slope exceeds the threshold value at a certain time, the communication unit of the slave station determines the slope from the measured value before the change and the power amount when the threshold value is exceeded. The server calculates and notifies the server of the amount of change, which is the slope of the electric energy, together with the meter reading time and the meter reading value of the electric energy. Thereby, on the server side, the graph 903 in FIG. 9E is restored. As in the case of FIG. 8D, in the present embodiment, the restored graph 903 is shifted from the graph 904, 905, or 906 of the actual power amount. However, this is within the error range of 907 or 908, and the error can be reduced by reducing the threshold value.

  In this case, if the change amount is not notified, the predicted value is significantly lower than the actual change, as indicated by 909 in FIG. 9 (e), so the graph has a large error range of 907 or 908. It deviates and it is difficult to control the error from the server.

Case 3: When the period of using less power is longer than the period of using more power than the notified power FIG. 10 shows that the period of using less power is larger than the initial predicted slope. It is explanatory drawing when it is longer than the period which used electric power. 10 (a), (b), and (c), as in FIG. 7 (b), in each band-like area, the central horizontal line of each area is the previous change amount, and the upper and lower bands of the central horizontal line are the threshold values. This is the difference between the current change amount and the previous change amount within the range. 1001a and 1001b are cases where more power is used than the power notified by the latest notification information, and 1002a, 1002b, 1002c and 1002d are cases where less power is used. 10D in FIG. 10D and FIG. 10E are electric energy restoration graphs restored by the present embodiment. In FIG. 10 (e), 1004, 1005, and 1006 are actual power amount graphs corresponding to the cases of FIGS. 10 (a), (b), and (c), respectively. Reference numerals 1007 and 1008 denote error ranges (upper limit value and lower limit value) defined by threshold values. Reference numeral 1009 denotes a power amount restoration graph that is restored when the change amount is not notified.

  First, FIG. 10A shows a case where power is first used in a range that does not exceed the threshold value as 1001a and then used for a short time, and then power that exceeds the threshold value is used last as 1002a. The actual power consumption graph corresponding to this case is 1004 in FIG.

  Next, FIG. 10B shows a case where power is initially used as a small amount as 1002b, then used as a short amount as 1001b, and power exceeding a threshold value is finally used. The actual power consumption graph corresponding to this case is 1005 in FIG.

  Next, FIG. 10 (c) shows a case where power is used as much as 1002c from a state where the same level of power as the first prediction is used, and finally power exceeding the threshold is used. The actual power consumption graph corresponding to this case is 1006 in FIG.

  10D of FIG. 10D and FIG. 10E represent a restoration graph on the server side according to the present embodiment. It is restored in the wind that it is used slightly slightly in the range not exceeding the threshold from the beginning.

  The graph shown in FIG. 10 (e) is similar to the case of FIG. 8 (d) and FIG. 9 (e), from the actual meter reading time, the meter reading value of the electric energy, and the amount of change that is the inclination of the electric energy. The figure which restored the electric energy in Fig. 1 shows the first two data from the start of measurement to the server. There is no change in the graph while using within the range that does not exceed the threshold. If the power usage suddenly increases and the slope exceeds the threshold value at a certain time, the communication unit of the slave station determines the slope from the measured value before the change and the power amount when the threshold value is exceeded. The server calculates and notifies the server of the amount of change, which is the slope of the electric energy, together with the meter reading time and the meter reading value of the electric energy. Thereby, on the server side, the graph 1003 in FIG. 10E is restored. Similarly to the case of FIG. 8D, in the present embodiment, the restored graph 1003 is deviated from the actual power amount graphs 1004, 1005, or 1006. However, this is within the error range of 1007 or 1008, and the error can be reduced by reducing the threshold value.

  In this case, if the change amount is not notified, the predicted value greatly exceeds the actual change as indicated by 1009 in FIG. 10E, so the graph has a larger error range of 1007 or 1008. It deviates and it is difficult to control the error from the server.

Case 4: When much more power is used with respect to the notified power FIG. 11 is an explanatory diagram when much more power is used with respect to the slope predicted first. FIG. 11A shows the current change amount in which the central horizontal line of each region is the previous change amount and the upper and lower bands of the central horizontal line are within the threshold range in each band-like region, as in FIG. 7B. And the difference between the previous changes. 1101 is a case where more power is used than the power notified by the latest notification information. Reference numeral 1102 in FIG. 11B is an electric energy restoration graph restored by the present embodiment. In FIG. 11B, 1103 is an actual power amount graph corresponding to the case of FIG. Reference numeral 1104 denotes an error range (upper limit value) defined by a threshold value. Reference numeral 1105 denotes a power amount restoration graph that is restored when the change amount is not notified.

  First, FIG. 11A shows a case where a large amount of power is continuously used as the first 1101 within a range not exceeding the threshold value. The actual power consumption graph corresponding to this case is 1103 in FIG.

  The graph shown in FIG. 11 (b) is the actual meter reading time, the meter reading value of the electric energy, and the gradient of the electric energy, as in the case of FIGS. 8 (d), 9 (e), and 10 (e). The figure which restored the electric energy on the server side from a certain change amount is shown, and the first two data are notified to the server from the start of measurement. Even if a large amount of power is used in a range not exceeding the threshold, there is no change in the graph with respect to the prediction. If the power usage suddenly increases and the slope exceeds the threshold value at a certain time, the communication unit of the slave station determines the slope from the measured value before the change and the power amount when the threshold value is exceeded. The server calculates and notifies the server of the amount of change, which is the slope of the electric energy, together with the meter reading time and the meter reading value of the electric energy. As a result, the server 110 restores the graph 1102 in FIG. It can be seen that the restoration has been performed almost correctly.

  In this case, when the change amount is not notified, the predicted value greatly falls below the actual change as indicated by 1105 in FIG. 11B, so the graph greatly deviates from the error range of 1104. Therefore, it is difficult to control the error from the server.

Case 5: When much less power is used with respect to the notified power FIG. 12 is an explanatory diagram when much less power is used with respect to the initially estimated slope. FIG. 12A shows the current change amount in which the central horizontal line of each region is the previous change amount and the upper and lower bands of the central horizontal line are within the threshold range in each band-like region, as in FIG. 7B. And the difference between the previous changes. 1201 is a case where less power is used than the power notified by the latest notification information. 1202 in FIG. 12B is an electric energy restoration graph restored by the present embodiment. In FIG. 12B, reference numeral 1203 is an actual power amount graph corresponding to the case of FIG. 1204 is an error range (lower limit value) defined by the threshold value. 1205 is a power amount restoration graph that is restored when the change amount is not notified.

  First, FIG. 12A shows a case where 1201 is continuously used with a small amount of power within a range not exceeding the threshold value as 1201. The actual power consumption graph corresponding to this case is 1203 in FIG.

  The graph shown in FIG. 12 (b) is the actual meter reading time, the meter reading value of the electric energy, and the gradient of the electric energy, as in the case of FIGS. 8 (d), 9 (e), and 10 (e). The figure which restored the electric energy on the server side from a certain change amount is shown, and the first two data are notified to the server from the start of measurement. Even if less power is used within a range that does not exceed the threshold, there is no change in the graph with respect to the prediction. If the power usage suddenly increases and the slope exceeds the threshold value at a certain time, the communication unit of the slave station determines the slope from the measured value before the change and the power amount when the threshold value is exceeded. The server calculates and notifies the server of the amount of change, which is the slope of the electric energy, together with the meter reading time and the meter reading value of the electric energy. As a result, on the server side, the graph 1202 in FIG. 12B is restored. Even in this case, it can be seen that the restoration is performed almost accurately.

  In this case, if the change amount is not notified, the predicted value greatly exceeds the actual change, as indicated by 1205 in FIG. 12B. Therefore, the graph greatly deviates from the error range of 1204. Therefore, it is difficult to control the error from the server.

FIG. 13 is a more detailed comparative explanatory diagram in the case of this embodiment and in the case of not sending the change amount.
This corresponds to the operation from 20:00 to 23:00 in FIG.
(1) When the meter reading value and the fluctuation amount are received at 20:30, the server starts predicting the electric energy on the prediction line A.
(2) Since no data is received from 21:00 to 22:30, the amount of power is predicted with the slope β.

(3) By receiving data at 23:00,
3-1) By receiving the meter reading value, the server can determine the power amount X of 23:00. 3-2) By receiving the fluctuation amount, the server can detect the slope between 22:30 and 23:00. The prediction of the electric energy can be started with the inclination α / 2.
(4) If the amount of change is not notified at this time, the server will start prediction on the prediction line Cfs, and the prediction of power demand will be greatly out of order.

As described above, by sending the fluctuation amount, the server can restore a graph equivalent to the amount of power indicated by the meter, and the power demand can be predicted more accurately.
In general, the server needs to monitor the life and death of each communication unit. Therefore, a method of monitoring the life and death of the slave station by sending only the header data even when it is within the threshold range can be considered. However, this means that unnecessary data other than the measured value flows in the network between the communication unit as the slave station and the server as the master station. On the other hand, in the present embodiment, for example, by targeting an ad hoc network, the communication units that are slave stations monitor each other using a life / death monitoring packet called a HELLO packet, so that they are slave stations. Unnecessary data does not flow between the network between the communication unit and the server serving as the master station.

  FIG. 14 is a diagram illustrating an example of a hardware configuration of a computer that can realize the function of the meter reading management function unit 302 of the communication unit 301 or the power amount fluctuation monitoring function unit 402 of the collection server 401 according to the present embodiment as software processing.

  14 includes a CPU 1401, a memory 1402, an input device 1403, an output device 1404, an external storage device 1405, and a portable recording medium drive in which a portable recording medium 1409 is inserted. A device 1406 and a communication interface 1407 are included and are connected to each other by a bus 1408. The configuration shown in the figure is an example of a computer that can implement the above system, and such a computer is not limited to this configuration.

  The CPU 1401 controls the entire computer. The memory 1402 is a memory such as a RAM that temporarily stores a program or data stored in the external storage device 1405 (or the portable recording medium 1409) when executing a program, updating data, or the like. The CUP 1401 performs overall control by reading the program into the memory 1402 and executing it.

  The input / output device 1403 detects an input operation by a user using a keyboard, a mouse, or the like, notifies the CPU 1401 of the detection result, and outputs data sent under the control of the CPU 1401 to a display device or a printing device.

The external storage device 1405 is, for example, a hard disk storage device. Mainly used for storing various data and programs.
The portable recording medium driving device 1406 accommodates a portable recording medium 1409 such as an optical disc, SDRAM, or Compact Flash (registered trademark), and has an auxiliary role for the external storage device 1405.

  The communication interface 1407 is a device for connecting, for example, an ad hoc network, a LAN (local area network), or a WAN (wide area network) communication line.

  When the system according to the present embodiment is realized as the communication unit 301 in FIG. 3, the system is realized by the CPU 1401 executing a program having functions realized by the operation flowchart of FIG. 5 and the like. Further, when realized as the collection server 401 in FIG. 4, it is realized by the CPU 1401 executing a program having functions realized by the operation flowchart of FIG. 6 or the like. The program may be distributed by being recorded in, for example, the external storage device 1405 or the portable recording medium 1409, or may be acquired from the network by the network connection device 1407.

  According to the embodiment described above, the application to the time series function showing the characteristic that the change rate does not change for a long time regardless of the change rate is very effective. Here, a general household occupies most of each point of the power consumption area existing in the power grid. This time series function of power consumption in a general home has a time zone showing an increase function characteristic in which the increase rate does not change for a long time (such as midnight or daytime when nobody is present). Therefore, application of this embodiment is effective for the meter-reading data notification control method in a power network (smart network). That is, in a standard case where there is no significant change in the amount of power change, the meter reading value information to be transmitted is greatly reduced, so that congestion of the power network can be avoided. In the above example, the number of meter reading value information notification packets is 8 packets per day, which can be reduced to 1/6 packet amount per day per household, and the total amount of meter reading information notification in the entire network is also approximately 1/6 packet amount. Can be reduced.

  Further, the present embodiment is not limited to a power network (smart network), and can be applied to a wide range of networks as long as it is a time-series function that exhibits a characteristic that the change rate does not change for a long time regardless of the rate of change. It is possible to apply to.

In addition, the meter reading information reception packet at the server can be reduced to almost 1/6, and the server load can be reduced and the required number of servers can be reduced.
Furthermore, even if the number of meter reading value information notifications is reduced, this is not a reduction in the number of notifications due to simply increasing the meter reading interval, but a reduction due to a reduction in notification of redundant information. For this reason, the power consumption can be restored on the server side based on the meter reading value, meter reading time, and meter reading change amount notified to the server side, and the demand power can be predicted based on the restored value.

101, 301 Communication unit 102 Gateway (GW)
DESCRIPTION OF SYMBOLS 103 Server 302 Meter reading management function part 303 Meter reading value register part 304 Change amount register part 305 Threshold determination / register part 306 Meter reading time monitoring / transmission time monitoring part 307 Data accumulation / meter reading value / change amount transmitting part 308 Meter reading meter interface 309 Wireless Transmission / reception control unit 310 Metering meter 401 Collection server 402 Power amount fluctuation monitoring function unit 403 Data reception unit discrimination unit 404 Meter reading value / change amount data storage unit 405 Power change amount calculation unit 406 Power amount restoration / predicted slope correction unit 407 Threshold change Instruction unit 408 Wired transmission / reception control unit 409 Electric energy graph generation / correction unit

Claims (11)

A method of notifying meter reading data from the communication unit to the meter reading data collecting side,
Calculate the difference between the change amount of the meter reading value notified last time and the change amount of the meter reading value calculated from the previous meter reading value and the current meter reading value,
When the calculated difference exceeds a predetermined threshold, the current meter reading value and the data for giving the previous meter reading value are transmitted.
A meter reading data transmission control method for a communication unit. The data for giving the current meter reading value and the previous meter reading value included in the transmitted meter reading data includes the current meter reading time, the current meter reading value, and the previous meter reading value and the current meter reading value. Includes three data of the derived meter reading value change amount,
The meter reading data transmission control method of the communication unit according to claim 1. When the calculated difference exceeds a predetermined threshold value, the meter reading data corresponding to the meter reading value is stored in the transmission buffer,
A series of meter reading data stored in the transmission buffer is transmitted together at a transmission timing that does not overlap with other predetermined communication units.
The meter-reading data transmission control method of the communication unit according to claim 1 or 2, characterized in that. A communication unit for notifying meter reading data to the meter reading data collecting side via a network,
A difference calculation unit that calculates a difference between a change amount of the meter reading value notified last time and a change amount of the meter reading value calculated from the previous meter reading value and the current meter reading value;
A transmission control unit that transmits the current meter reading value and the data for giving the previous meter reading value when the calculated difference exceeds a predetermined threshold;
A communication unit comprising: Calculate the difference between the change amount of the meter reading value notified last time and the change amount of the meter reading value calculated from the previous meter reading value and the current meter reading value,
When the calculated difference exceeds a predetermined threshold threshold value, the current meter reading value and data for giving the previous meter reading value are transmitted.
A program that causes the communication unit to execute the function. Calculate the difference between the change amount of the meter reading value notified last time and the change amount of the meter reading value calculated from the previous meter reading value and the current meter reading value,
When the calculated difference exceeds a predetermined threshold, the current meter reading value and the data for giving the previous meter reading value are transmitted.
The processing is executed in the communication unit,
Receiving meter reading data transmitted from the communication unit,
Restoring the meter reading value in the communication unit based on the data for giving the current meter reading value and the previous meter reading value included in the meter reading data;
The processing is executed by a server device that collects meter reading data from the communication unit 301.
The meter-reading data communication control method characterized by the above-mentioned. The data for giving the current meter reading value and the previous meter reading value included in the series of meter reading data includes the current meter reading time, the current meter reading value, and the previous meter reading value and the current meter reading value. Includes three data of the derived meter reading value change amount,
Based on the current meter reading time, the current meter reading value, and the meter reading change amount in the first set of meter reading data, the first set of meter readings from the first set of current meter reading values. By subtracting the value change amount, the meter reading value at the meter reading time immediately before the current meter reading time of the first set is restored,
The current meter reading time in the second set of meter reading data before the first set of meter reading data and the second set of meter reading data before one set of the first set of meter reading data. And restoring the meter reading value not notified from the communication unit based on the current meter reading value,
The meter-reading data communication control method according to claim 6. When the calculated difference exceeds a predetermined threshold, the meter reading data is stored in a transmission buffer,
At a predetermined transmission timing, the meter reading data stored in the transmission buffer is transmitted together,
Processing is performed in the communication unit;
The meter-reading data transmission control method of the communication unit according to any one of claims 6 and 7.   When the server device determines that there is a large error in the statistical value of the meter reading value, data of the predetermined threshold is transmitted to and used by some or all of the communication units. Item 9. A meter reading data transmission control method for a communication unit according to any one of Items 6 to 8. Receive meter reading data sent from the communication unit,
The meter reading data includes three data of the current meter reading time, the current meter reading value, and the previous meter reading value and the meter reading value change amount derived from the current meter reading value,
Based on the current meter reading time, the current meter reading value, and the meter reading change amount in the first set of meter reading data, the first set of meter readings from the first set of current meter reading values. By subtracting the value change amount, the meter reading value at the meter reading time immediately before the current meter reading time of the first set is restored,
The current meter reading time in the second set of meter reading data before the first set of meter reading data and the second set of meter reading data before one set of the first set of meter reading data. And restoring the meter reading value not notified from the communication unit based on the current meter reading value,
The meter-reading data communication control method of the server apparatus characterized by the above-mentioned. A meter reading data receiving and accumulating unit for receiving and accumulating meter reading data transmitted from the communication unit;
The meter reading data includes three data of the current meter reading time, the current meter reading value, and the previous meter reading value and the meter reading value change amount derived from the current meter reading value,
Based on the current meter reading time, the current meter reading value, and the meter reading change amount in the first set of meter reading data, the first set of meter readings from the first set of current meter reading values. By subtracting the value change amount, the meter reading value at the meter reading time immediately before the current meter reading time of the first set is restored,
The current meter reading time in the second set of meter reading data before the first set of meter reading data and the second set of meter reading data before one set of the first set of meter reading data. And restoring the meter reading value not notified from the communication unit based on the current meter reading value,
Meter reading value calculation restoration unit,
The server apparatus characterized by having.