JP2014183665A - Power management device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management device and a program for functioning the power management device capable of calculating an adjustment amount for adjusting the power consumption so that average demand power for a prescribed period does not exceed a target value.SOLUTION: An arithmetic processing section 10 measures the power consumption of an electrical apparatus on the basis of a power source voltage measured by a voltage measurement section 11 and a load current measured by a current measurement unit 12 to calculate the power consumption for a prescribed period from a start point to the present of every prescribed period. The arithmetic processing section 10 calculates a measured value of the average demand power from a start point of the prescribed period to the present on the basis of the power consumption and elapsed time from the start point of the prescribed period to the present. The arithmetic processing section 10 calculates an adjustment amount for increasing or reducing the average demand power in a remaining period of time by dividing a value which is obtained by subtracting the measured value from the target value of the average demand power by a ratio of a remaining period of the prescribed period to a time range of the prescribed period, and displays the adjustment amount on a display 15.

Description

  The present invention relates to a power management apparatus and a program for realizing the power management apparatus.

  Conventionally, the average power demand is obtained by measuring the power consumption of a plurality of electrical devices and totaling the measurement results every 30 minutes, and when the average demand power exceeds the maximum demand power or an arbitrarily set target value, There is an electric energy management device that displays the effect (see, for example, Patent Document 1).

JP 2006-87158 A

  In the power management apparatus described above, if the target value is set to a value lower than the maximum demand power, this is displayed when the average demand power for the predetermined period exceeds the target value. The customer can be informed that the maximum power demand is approaching. The customer who sees this display tries to suppress the power consumption by stopping the electric device so that the average demand power does not exceed the maximum demand power.

  However, just indicating that the average demand power has exceeded the target value, how much the average demand power exceeds the target value, or how much margin is available until the average demand power exceeds the maximum demand power. There was a problem that it was difficult to take countermeasures.

  The present invention has been made in view of the above problems, and its purpose is to provide power management capable of obtaining an adjustment amount for adjusting power consumption so that average demand power in a predetermined period does not exceed a target value. An apparatus and a program for realizing the power management apparatus are provided.

  The power management apparatus of the present invention includes a measurement unit, an average demand power calculation unit, and an adjustment amount calculation unit. The measurement unit measures the power consumption of the electrical equipment. The average demand power calculation unit calculates an actual measurement value of the average demand power from the start of the predetermined period to the present based on a value obtained by integrating the power consumption from the start of the predetermined period to the present for each predetermined period. The adjustment amount calculation unit divides the value obtained by subtracting the actual measurement value from the target value of the average demand power by the ratio of the remaining period of the predetermined period to the time width of the predetermined period, thereby calculating the average demand in the remaining period. An adjustment amount for increasing or decreasing the power is calculated.

  In this power management apparatus, it is preferable that the measurement unit individually measures the power consumption of the plurality of electric devices to obtain the total power consumption, and includes a notification unit. When the adjustment amount is a negative value, the notification unit reduces the average demand power more than the adjustment amount based on the adjustment amount and the power consumption of each of the electric devices measured by the measurement unit. The electric device that needs to be stopped is notified.

  In this power management apparatus, it is preferable that the measurement unit individually measures power consumption of the plurality of electric devices to obtain a total power consumption, and includes a storage unit and a control unit. The storage unit stores priorities of the plurality of electric devices. When the adjustment amount is a negative value, the control unit reduces the average demand power more than the adjustment amount based on the adjustment amount and the power consumption of each electric device measured by the measurement unit. The electrical devices are stopped in order from the electrical device with the lowest priority.

  The program of the present invention is a program for causing a computer to operate as a power management apparatus. The power management apparatus includes a measurement unit, an average demand power calculation unit, and an adjustment amount calculation unit. The measurement unit measures the power consumption of the electric device. The average demand power calculation unit obtains an actual measurement value of average demand power from the start of the predetermined period to the present based on a value obtained by integrating the power consumption from the start of the predetermined period to the present for each predetermined period. The adjustment amount calculation unit divides the value obtained by subtracting the actual measurement value from the target value of the average demand power by the ratio of the remaining period of the predetermined period to the time width of the predetermined period, thereby calculating the average demand in the remaining period. An adjustment amount for increasing or decreasing the power is calculated.

  In this program, the measurement unit individually measures the power consumption of the plurality of electrical devices to obtain the total power consumption, and when the adjustment amount is a negative value, the adjustment amount and the measurement Based on the power consumption of each of the electrical devices measured by the unit, as a power management device including a notification unit for notifying the electrical device that needs to be stopped to reduce the average demand power more than the adjustment amount, A computer may be operated.

  In this program, the measurement unit individually measures the power consumption of the plurality of electrical devices to obtain the total power consumption, and when the adjustment amount is a negative value, the adjustment amount and the measurement Based on the power consumption of each of the electrical devices measured by the unit and the priority set for each of the electrical devices, from the electrical device having a lower priority in order to reduce the average demand power more than the adjustment amount A computer may be operated as a power management apparatus including a control unit that sequentially stops the electrical devices.

  According to the power management apparatus of the present invention, an actual measurement value of average demand power is obtained based on the amount of power used from the start of a predetermined period to the present every predetermined period, and obtained by subtracting the actual measurement value from a target value. From the value, an adjustment amount for increasing or decreasing the average demand power in the remaining period of the predetermined period is obtained. When the actual measurement value exceeds the target value, the consumer knows how much power consumption should be reduced based on the adjustment amount calculated by the adjustment amount calculation unit. It is less likely that the power consumption will be exceeded or the power consumption will be excessively reduced beyond the required amount. In addition, when the actual measurement value is lower than the target value, the consumer can determine how much the power consumption increases and the average power demand exceeds the target value based on the adjustment amount calculated by the adjustment amount calculation unit. Therefore, attention can be paid to the increase in power consumption so that the average power demand does not exceed the target value.

  According to the program of the present invention, when the measured value exceeds the target value by operating the computer as the power management apparatus as described above, the consumer uses the adjustment amount calculated by the adjustment amount calculation unit. It can be seen how much power consumption should be reduced. When the measured value is below the target value, the consumer can see how much the average power demand exceeds the target value when the power consumption increases based on the adjustment amount calculated by the adjustment amount calculation unit. .

It is a block diagram of the power management apparatus of this embodiment. It is a block diagram which shows the other form of a power management apparatus same as the above. The other form of a power management apparatus same as the above is shown, (a) is a block diagram, (b) is a schematic circuit diagram of the whole system using a power management apparatus.

  An embodiment of a power management apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of the power management apparatus 1. The power management apparatus 1 includes an arithmetic processing unit 10, a voltage measurement unit 11, a current measurement unit 12, an operation unit 13, a data management unit 14, a display unit 15, a contact point 16, a contact opening / closing unit 17, And a power supply unit 18.

  The arithmetic processing unit 10 is composed of a microcomputer, and this microcomputer executes a program stored in a ROM (not shown) or the like, whereby each function of the power management apparatus 1 (that is, a measurement unit, an average demand power calculation unit, Functions as an adjustment amount calculation unit, a notification unit, and a control unit) are realized.

  The voltage measurement unit 11 measures the power supply voltage supplied from the commercial power supply 2 and outputs the measurement result to the arithmetic processing unit 10.

  The current measuring unit 12 measures and measures the current (load current) flowing through the electrical device based on the output of the current sensor 3 (for example, a current transformer) that measures the current (load current) supplied to the electrical device. The result is output to the arithmetic processing unit 10.

  The operation unit 13 includes a plurality of operation buttons (not shown), and outputs a signal corresponding to the operation to the arithmetic processing unit 10 when the operation button is operated by the user. For example, the operation unit 13 is used to set a target value of average demand power in a predetermined period. When a consumer inputs a target value of average demand power using the operation unit 13, the arithmetic processing unit 10 stores the target value input from the operation unit 13 in the data management unit 14.

  The data management unit 14 includes a card slot (not shown) in which a memory card such as an SD memory card is mounted, for example, and a measured value of power consumption and a target of average demand power are stored in the memory card mounted in the card slot. Store data such as values. The data management unit 14 is configured to write data to and read data from a memory card mounted in the card slot under the control of the arithmetic processing unit 10.

  The display unit 15 is composed of a liquid crystal display, for example. The display content of the display unit 15 is controlled by the arithmetic processing unit 10, and the arithmetic processing unit 10 causes the display unit 15 to display, for example, a measured value of power consumption.

The contact 16 is connected between the output terminals t1 and t2. For example, an external warning light is connected to the output terminals t1 and t2, and the warning light is turned on when the contact 16 is turned on, and the warning light is turned off when the contact 16 is turned off. A buzzer or the like may be connected to the output terminals t1 and t2. In this case, the buzzer sounds when the contact 16 is turned on, and the buzzer stops when the contact 16 is turned off. The contact 16 is turned on or off in accordance with a control signal from the unit 10.

  The power supply unit 18 converts an AC voltage supplied from the commercial power supply 2 into a DC voltage, and supplies an operating voltage to each circuit included in the power management apparatus 1.

  The power management apparatus 1 according to this embodiment is used by a consumer who receives power from an electric power company to manage power consumption.

  In a contract between an electric power company and a consumer, the largest maximum demand power among the maximum demand power in the past 11 months from the current month is set as the contract power, and the electricity rate is determined based on this contract power. The maximum demand power (so-called demand value) is the maximum of the average demand power calculated in 30-minute units (30 minutes from 0 to 30 minutes per hour and 30 minutes from 30 to 60 minutes per hour) in the month. The average power demand.

  Because of the contract as described above, when the maximum demand power for the current month exceeds the largest maximum demand power among the maximum demand powers for the past 11 months, the contract power becomes high and the electricity bill becomes high accordingly. Since the increase in electricity charges is not desirable for consumers, consumers install a power management device 1 that monitors the average demand power every 30 minutes, and suppresses power consumption so that the average demand power does not exceed the maximum demand power I am trying. In the power management apparatus 1, for example, 90% of the largest maximum demand power among the maximum demand powers for the past 11 months is set as the target value. The power management apparatus 1 measures the average demand power every 30 minutes, and issues a warning when the average demand power is likely to exceed the target value. Therefore, the customer who hears this warning restricts the use of the electric equipment. Therefore, the average demand power is kept from exceeding the maximum demand power.

  The operation of the power management apparatus 1 will be described below.

  Each time a predetermined measurement cycle elapses, the voltage measurement unit 11 measures a power supply voltage, and the current measurement unit 12 measures a current (load current) flowing through the electrical device. The arithmetic processing unit 10 calculates the power consumption of the electrical device based on the power supply voltage measured by the voltage measuring unit 11 and the load current measured by the current measuring unit 12, and sequentially sends the measurement results to the data management unit 14. Remember. When calculating the power consumption, the arithmetic processing unit 10 integrates the power consumption from the start of the predetermined period to the present for every predetermined period (every hour from every hour), and uses the power consumption WH1 [Wh to the present. ]. The arithmetic processing unit 10 obtains an actual measurement value of the average demand power in the predetermined period by dividing the electric power consumption WH1 [Wh] used up to the present by the elapsed time [hr] from the start of the predetermined period to the present. That is, assuming that the amount of power used from the start of the predetermined period to the present is WH1 [Wh] and the elapsed time from the start of the predetermined period to the present is dt1 [minutes], the actual measured value P1 [W] of the average demand power is It can be obtained by the following equation.

P1 = WH1 / (dt1 / 60) = WH1 × 60 / dt1 (1)
Next, the arithmetic processing unit 10 divides the value obtained by subtracting the actual measurement value P1 from the target value P2 of the average demand power by the ratio R1 of the remaining period (T1-dt1) with respect to the time width T1 of the predetermined period. Then, an adjustment amount P3 for increasing or decreasing the average demand power in the remaining period from the actual measurement value P1 is calculated.

P3 = (P2-P1) / R1
R1 = (T1-dt1) / T1
∴P3 = (P2-P1) × T1 / (T1-dt1) (2)
When the arithmetic processing unit 10 calculates the adjustment amount P3, the calculation result of the adjustment amount P3 is displayed on the display unit 15, and the consumer can be informed of the adjustment amount P3 of the average demand power in the remaining period. When the actual measurement value P1 from the start of the predetermined period to the present is below the target value P2, the adjustment amount P3 is a positive value, and the increase in power consumption is within the adjustment amount P3 in the remaining period of the predetermined period. If so, the average power demand will not exceed the maximum power demand. When the actual measurement value P1 from the start of the predetermined period to the present exceeds the target value P2, the adjustment amount P3 becomes a negative value, and the power consumption is reduced by more than the absolute value of the adjustment amount P3 in the remaining period of the predetermined period. Otherwise, the average demand power exceeds the maximum demand power.

  Thus, since the adjustment amount P3 is displayed on the display unit 15, the consumer looks at the adjustment amount P3 displayed on the display unit 15 and how much the actual measured value P1 of the average demand power has the target value P2. It can be determined whether the measured value P1 is higher than the target value P2. When the actual measured value P1 of the average demand power exceeds the target value P2, the consumer determines how much power consumption should be reduced in order to suppress the average demand power for the predetermined period to the maximum demand power or less. it can. Therefore, it is difficult for a consumer to reduce power consumption more than necessary or to reduce the amount of reduction and exceed the maximum demand power. In addition, when the actual measured value P1 of the average demand power is lower than the target value P2, when the consumer increases the power consumption from the value of the adjustment amount P3, the average demand power for the predetermined period becomes the maximum demand power. You can understand whether it will exceed the limit, and alert customers.

  For example, when the target value P2 of the average demand power is set to 38 kW and the used power amount WH1 used between 0 minutes and 25 minutes from the hour is 17 kWh, the adjustment amount P3 is as follows: Desired.

  First, the arithmetic processing unit 10 calculates an actual demand value P1 of the average demand power using the above formula (1).

P1 = 17 × 60/25 = 40.8 [kW]
Next, the arithmetic processing part 10 calculates | requires adjustment amount P3 using said Formula (2).

P3 = (38-40.8) × 30 / (30-25) = − 16.8 [kW]
In this case, in order to suppress the average demand power for 30 minutes to the target value P2 or less, it is necessary to reduce the average demand power in the remaining period from the actual measurement value of 40.8 kW to 16.8 kW or more. That is, it is necessary to suppress the average demand power in the remaining period of 5 minutes from 25 minutes to 30 minutes to 24 kW or less.

  The arithmetic processing unit 10 displays the value (−16.8 kW) of the adjustment amount P3 on the display unit 15. Based on this display, if the consumer reduces the power consumption by 16.8 kW or more, the calculation processing unit 10 displays a predetermined period. It can be determined that the average demand power can be kept below the target value of 38 kW. In the present embodiment, the display unit 15 serving as a notification unit displays the adjustment amount P3 on the liquid crystal display as character information. For example, the adjustment amount P3 is displayed by a speaker (not shown) using voice synthesized by voice synthesis technology. May be output.

  Further, in the above embodiment, the arithmetic processing unit 10 calculates the power consumption based on the measurement result of the power supply voltage and the measurement result of the load current and integrates the used electric energy, as shown in FIG. The amount of power used may be obtained based on the result of integrating the amount of power with the external power integrator 4.

  The power management apparatus 1 shown in FIG. 2 includes a pulse measurement unit 19 that counts the pulse signals output from the power integrator 4 in place of the voltage measurement unit 11 and the current measurement unit 12 described above. The power integrator 4 measures and integrates the amount of power consumed by the electrical equipment, and outputs one pulse signal each time the integrated value increases by a certain amount. The pulse measuring unit 19 counts the number of pulse signals output from the power integrator 4 from the start of the predetermined period to the present. The arithmetic processing unit 10 integrates the power consumption from the start of the predetermined period to the present based on the measurement result of the pulse measurement unit 19, and the integrated value [Wh] as the elapsed time [hr] from the start of the predetermined period. ] To obtain the average demand power to date. Since the method other than the method for measuring power consumption is the same as that of the power management apparatus 1 shown in FIG. 1, common components are denoted by the same reference numerals and description thereof is omitted.

  Further, when the average demand power for a predetermined period exceeds the target value, the arithmetic processing unit 10 outputs a control signal to the contact opening / closing unit 17 to turn on the contact 16, and a warning light connected to the output terminals t1 and t2. Is turned on to notify that the average demand power is likely to exceed the maximum demand power.

  As described above, the power management apparatus 1 according to the present embodiment includes the measurement unit, the average demand power calculation unit, and the adjustment amount calculation unit. The measurement unit includes a voltage measurement unit 11, a current measurement unit 12, and an arithmetic processing unit 10 (or a pulse measurement unit 19 and an arithmetic processing unit 10), and measures the power consumption of the electric device. The average demand power calculation unit is composed of the arithmetic processing unit 10 and is averaged from the start of the predetermined period to the present based on the value obtained by integrating the power consumption measured by the measurement unit from the start of the predetermined period to the present every predetermined period. Calculate the measured value of power demand. The adjustment amount calculation unit includes the arithmetic processing unit 10 and divides the value obtained by subtracting the actual measurement value from the target value of the average demand power by the ratio of the remaining period of the predetermined period to the time width of the predetermined period, An adjustment amount for increasing or decreasing the average demand power in the remaining period is calculated.

  As described above, the average demand power calculation unit obtains an actual measurement value of the average demand power from the amount of power used from the start of the predetermined period to the present for each predetermined period. The adjustment amount calculating unit obtains an adjustment amount for increasing or decreasing the average demand power in the remaining period of the predetermined period from the value obtained by subtracting the actual measurement value from the target value of the average demand power. Therefore, if the actual measurement value exceeds the target value, the consumer knows how much power consumption should be reduced based on the calculated adjustment amount, so the reduction amount is insufficient and the target value is exceeded. It is less likely that the power consumption will be excessively reduced beyond the required amount. In addition, when the actual measurement value is lower than the target value, the consumer determines how much the power consumption increases based on the calculated adjustment amount and the average demand power for the predetermined period exceeds the maximum demand power. Obviously, attention can be paid to the use of electrical equipment so as not to exceed the maximum power demand.

  By the way, in said embodiment, although the arithmetic processing part 10 displays the calculated adjustment amount on the display part 15, when the measured value of average demand electric power exceeds the target value, the arithmetic processing part 10 is electric. The device may be automatically stopped to reduce the average demand power for a predetermined period to a target value or less.

  A block diagram of the power management apparatus 1 in this case is shown in FIG. 3A, and a schematic circuit diagram of the entire system using the power management apparatus 1 is shown in FIG. In addition, the same code | symbol is attached | subjected to the component which is common in the power management apparatus 1 shown in FIG. 1, and the description is abbreviate | omitted.

  A plurality of current sensors 3a, 3b, 3c are connected to the current measuring unit 12. The current sensors 3a, 3b, and 3c are formed of, for example, a current transformer, and are connected to power supply paths to the corresponding electric devices. The current sensor 3a is provided in a power supply path to the electric device 6a, and measures a current (load current) flowing through the electric device 6a. The current sensor 3b is provided in a power feeding path to the electric device 6b and measures a current flowing through the electric device 6b. The current sensor 3c is provided in a power feeding path to the electric device 6c and measures a current flowing through the electric device 6c.

  The current measurement unit 12 individually measures the currents flowing through the electric devices 6a, 6b, and 6c based on the outputs of the current sensors 3a, 3b, and 3c, and outputs the measurement results to the arithmetic processing unit 10.

  The arithmetic processing unit 10 uses the power supply voltage measured by the voltage measuring unit 11 and the current consumption of each electric device 6a, 6b, 6c measured by the current measuring unit 12 to consume the electric devices 6a, 6b, 6c. The power consumption is calculated individually, and the total power is calculated by calculating the sum.

  The power management apparatus 1 also includes a cutoff control unit 20 that controls on / off of the cutoff devices 5a, 5b, and 5c made of, for example, electromagnetic relays. The shut-off control unit 20 individually controls on / off of the shut-off devices 5a, 5b, and 5c in accordance with a control signal from the arithmetic processing unit 10. The interruption | blocking apparatus 5a is connected between the commercial power source 2 and the electric equipment 6a, and switches the state which supplies electric power to the electric equipment 6a, and the state which interrupts | blocks the electric power feeding to the electric equipment 6a. The interruption | blocking apparatus 5b is connected between the commercial power source 2 and the electric equipment 6b, and switches the state which supplies electric power to the electric equipment 6b, and the state which interrupts | blocks the electric power feeding to the electric equipment 6b. The interruption | blocking apparatus 5c is connected between the commercial power source 2 and the electric equipment 6c, and switches the state which supplies electric power to the electric equipment 6c, and the state which interrupts | blocks the electric power feeding to the electric equipment 6c.

  The consumer uses the operation unit 13 to set the priorities of a plurality of electric devices 6a, 6b, 6c in advance, and the arithmetic processing unit 10 prioritizes the electric devices 6a, 6b, 6c input by the consumer. The rank is stored in the data management unit 14.

  In the power management apparatus 1 as well, as in the power management apparatus 1 described with reference to FIG. 1, the voltage measurement unit 11 measures the power supply voltage every time a predetermined measurement cycle elapses, and the current measurement unit 12 The current (load current) flowing through each electric device 6a, 6b, 6c is individually measured. The arithmetic processing unit 10 calculates the power consumption for each electrical device from the power supply voltage measured by the voltage measurement unit 11 and the load current for each electrical device measured by the current measurement unit 12 and consumes it in the data management unit 14. The calculation result of power is stored sequentially. When calculating the power consumption for each electrical device, the arithmetic processing unit 10 calculates the total power consumption (total value of power consumption of each electrical device) from the start of a predetermined period (every 30 minutes from every hour) to the present. Integration is performed to determine the amount of power used WH1 up to now. The arithmetic processing unit 10 obtains an actual measurement value of the average demand power by dividing the power consumption amount WH1 [Wh] used up to the present time by the elapsed time [hr] from the start of the predetermined period to the present time. Here, assuming that the amount of power used from the start of the predetermined period to the present is WH1, and the elapsed time is dt1 [minutes], the actual measured value P1 of the average demand power is obtained by the above equation (1).

  When the actual measurement value P1 of the average demand power is calculated, the arithmetic processing unit 10 obtains the value obtained by subtracting the actual measurement value P1 from the target value P2 of the average demand power for the remaining of the predetermined period with respect to the time width T1 of the predetermined period. By dividing by the ratio of the period (T1-dt1), an adjustment amount P3 for increasing or decreasing the average demand power in the remaining period from the actual measurement value is calculated.

  Here, when the actual measurement value P1 from the start of the predetermined period to the present exceeds the target value P2, the adjustment amount P3 becomes a negative value, and the power consumption is reduced by the adjustment amount P3 or more in the remaining period of the predetermined period. Otherwise, the average demand power exceeds the maximum demand power. If the adjustment amount P3 obtained by the above calculation is a negative value, the arithmetic processing unit 10 is based on the power consumption and the priority order of the electrical devices 6a, 6b, 6c stored in the data management unit 14. In order to reduce the power consumption by the adjustment amount P3 or more, an electric device to be stopped is selected. That is, the arithmetic processing unit 10 selects one or more electric devices in order from the electric device with the lowest priority until the total power consumption of the selected electric device becomes equal to or greater than the adjustment amount P3. And the arithmetic processing part 10 outputs the control signal which stops the selected electric equipment to the interruption | blocking control part 20, and the interruption | blocking control part 20 turns off a corresponding interruption | blocking apparatus. Thereby, the electric equipment selected by the arithmetic processing unit 10 can be stopped, and the average demand power for a predetermined period can be automatically suppressed to a target value or less.

  As described above, the measurement units (the arithmetic processing unit 10, the voltage measurement unit 11, and the current measurement unit 12) individually measure the power consumption of the plurality of electrical devices 6a, 6b, and 6c, and sum the power consumption. Seeking. The storage unit composed of the data management unit 14 stores the priorities of the plurality of electric devices 6a, 6b, 6c. When the adjustment amount P3 is a negative value, based on the adjustment amount P3 and the power consumption of each electric device, the electric devices are stopped in order from the electric device with the lowest priority in order to reduce the average demand power by the adjustment amount P3 or more. The power management apparatus 1 includes a control unit (comprising the arithmetic processing unit 10 and the cutoff control unit 20).

  Thereby, since the control part has selected the electric device which should be stopped in order from the electric device with the lowest priority based on the adjustment amount P3 and the power consumption of each electric device, the power consumption is reduced by the adjustment amount P3 or more. In addition, the average demand power for a predetermined period can be automatically reduced to a target value or less.

  When the adjustment amount P3 is a negative value, the arithmetic processing unit 10 reduces power consumption by automatically stopping the electrical devices selected in order from the electrical device with the lowest priority, but the selected amount is selected. You may alert | report a consumer with an electric equipment.

  As described above, when the arithmetic processing unit 10 calculates the adjustment amount P3, if the actual measurement value P1 from the start of the predetermined period to the present exceeds the target value P2, the adjustment amount P3 becomes a negative value. . In this case, unless the power consumption is reduced by at least the adjustment amount P3, the average demand power exceeds the maximum demand power. Therefore, if the adjustment amount P3 obtained by the above calculation is a negative value, the arithmetic processing unit 10 is based on the power consumption and the priority order of the electrical devices 6a, 6b, 6c stored in the data management unit 14. Thus, in order to reduce the power consumption by the adjustment amount P3 or more, the electric device to be stopped is selected. That is, the arithmetic processing unit 10 selects one or a plurality of electric devices so that the total power consumption of the selected electric device is equal to or greater than the adjustment amount P3, and information on the selected electric devices (for example, name, identification number, etc.) ) Is displayed on the display unit 15. Based on the display content of the display unit 15, the consumer can know the electrical equipment that needs to be stopped in order to suppress the average demand power for a predetermined period below the target value. By stopping, the average demand power for a predetermined period can be suppressed below the target value.

  The storage unit (data management unit 14) stores the priorities of the plurality of electric devices 6a, 6b, and 6c, and the arithmetic processing unit 10 determines the adjustment amount P3 and the measurement result of the power consumption for each electric device. Based on the priority order, the electric device to be stopped may be selected in order to reduce the power consumption by the adjustment amount P3 or more. That is, the arithmetic processing unit 10 selects one or a plurality of electric devices in order from the electric device with the lowest priority until the total power consumption of the selected electric device becomes equal to or greater than the adjustment amount P3, and the selected electric device. Information (for example, name and identification number) is displayed on the display unit 15. Based on the display content of the display unit 15, the consumer can know the electrical equipment that needs to be stopped in order to suppress the average demand power for a predetermined period below the target value. By stopping, the average demand power for a predetermined period can be suppressed below the target value.

  Note that the method of notifying the electrical device selected by the arithmetic processing unit 10 is not limited to display using characters or the like, and the arithmetic processing unit 10 synthesizes the name and identification information of the selected electrical device by speech synthesis. You may make it output from a speaker with an audio | voice.

  As described above, the measurement units (the voltage measurement unit 11, the current measurement unit 12, and the arithmetic processing unit 10) individually measure the power consumption of the plurality of electrical devices 6a, 6b, and 6c to obtain the total power consumption. ing. When the adjustment amount P3 is a negative value, the power management device 1 needs to be stopped based on the adjustment amount P3 and the power consumption of each electric device in order to reduce the average demand power more than the adjustment amount P3. An informing unit (comprising the arithmetic processing unit 10 and the display unit 15) for informing the device is provided.

  Thereby, the consumer can know the electric device that needs to be stopped to reduce the power consumption by the adjustment amount P3 or more based on the notification content of the notification unit, and stop the notified electric device. Thus, the average demand power for a predetermined period can be suppressed below the target value.

  In the example of FIGS. 3A and 3B, the number of electrical devices 6a, 6b, and 6c is three, but the number of electrical devices can be appropriately changed according to the system configuration.

  In the circuit configuration of FIG. 3, the current flowing through each electrical device is measured by a current sensor, and the power consumption of each electrical device is measured based on the current measurement result and the power supply voltage measurement result. A power accumulator that measures the power consumption of each electrical device may be used. The power integrator measures the power consumption of each electric device and outputs a pulse signal each time the integrated value of the power consumption reaches a certain amount. The power management apparatus 1 can individually measure the power consumption of the electrical equipment by counting the pulse signals output from each power integrator.

DESCRIPTION OF SYMBOLS 1 Power management apparatus 3, 3a, 3b, 3c Current sensor 5a, 5b, 5c Breaker 6a, 6b, 6c Electric equipment 10 Arithmetic processing part (measurement part, average demand power calculation part, adjustment amount calculation part, notification part, control Part)
11 Voltage measurement unit (measurement unit)
12 Current measurement unit (measurement unit)
14 Data management unit (storage unit)
15 Display unit (notification unit)
19 Pulse measurement unit (measurement unit)
20 Blocking control unit (control unit)
t1, t2 output terminals

Claims (6)

A measurement unit for measuring the power consumption of the electrical equipment;
An average demand power calculation unit that calculates an actual measurement value of average demand power from the start of the predetermined period to the present based on a value obtained by integrating the power consumption from the start of the predetermined period to the present for each predetermined period;
Adjustment amount to increase or decrease the average demand power in the remaining period by dividing the value obtained by subtracting the actual measurement value from the target value of the average demand power by the ratio of the remaining period of the predetermined period to the time width of the predetermined period An adjustment amount calculation unit for calculating
A power management apparatus comprising: The measuring unit individually measures the power consumption of the plurality of electric devices to obtain a total power consumption,
When the adjustment amount is a negative value, it is necessary to stop the average demand power to reduce the adjustment amount or more based on the adjustment amount and the power consumption of each electric device measured by the measurement unit. The power management apparatus according to claim 1, further comprising a notification unit that notifies a certain electric device. The measuring unit individually measures the power consumption of the plurality of electric devices to obtain a total power consumption,
A storage unit for storing a priority order of the plurality of electrical devices;
When the adjustment amount is a negative value, the priority is low in order to reduce the average demand power more than the adjustment amount based on the adjustment amount and the power consumption of each electric device measured by the measurement unit. The power management apparatus according to claim 1, further comprising a control unit configured to stop the electric device in order from the electric device. Computer
A measurement unit for measuring the power consumption of the electrical equipment;
An average demand power calculation unit that calculates an actual measurement value of average demand power from the start of the predetermined period to the present based on a value obtained by integrating the power consumption from the start of the predetermined period to the present for each predetermined period;
Adjustment amount to increase or decrease the average demand power in the remaining period by dividing the value obtained by subtracting the actual measurement value from the target value of the average demand power by the ratio of the remaining period of the predetermined period to the time width of the predetermined period A power management device comprising an adjustment amount calculation unit for calculating
Program to operate as. The program according to claim 4,
The measuring unit individually measures the power consumption of the plurality of electric devices to obtain a total power consumption,
When the adjustment amount is a negative value, it is necessary to stop the average demand power to reduce the adjustment amount or more based on the adjustment amount and the power consumption of each electric device measured by the measurement unit. As a power management device including a notification unit that notifies a certain electric device,
A program for operating a computer. The program according to claim 4,
The measuring unit individually measures the power consumption of the plurality of electric devices to obtain a total power consumption,
When the adjustment amount is a negative value, the average demand power based on the adjustment amount, the power consumption of each electric device measured by the measurement unit, and the priority set for each electric device. In order to reduce the adjustment amount or more, as a power management device comprising a control unit for stopping the electrical equipment in order from the electrical equipment with a low priority,
A program for operating a computer.

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