JP6446256B2 - Demand power control apparatus and demand power control method - Google Patents

Description

  The present invention relates to a demand power control device that suppresses demand power and a demand power control method.

  In recent years, there is a case where suppression (cut) of the peak of received power is required due to a request for reduction of power usage fee. In response to such demands, a technology is known that suppresses (cuts) the peak of received power by supplying power from a power storage device such as a storage battery when the power received from the commercial power system exceeds a predetermined value. (For example, refer to Patent Document 1).

  Here, Patent Document 1 discloses a power distribution system that can reduce contract power without increasing the capacity of a battery. In this power distribution system, the on-site load is a first system load (always power supply load) that is constantly fed, a second system load (peak shift load) that is fed from the storage battery during power peak hours, and power The system is divided into three systems, that is, a third system load (peak cutting load) in which power supply is stopped in the peak time zone.

  Then, the storage battery connected to the peak shift load is charged in a light load time zone including midnight and discharged in a power peak time zone (for example, around PM 1 to 4 o'clock). That is, in the power peak time zone, power is supplied from the storage battery to the load of the second system (peak shift load). In addition, during the power peak time period, power supply to the third system load (peak cut load) is stopped.

JP 2000-92717 A

  As described above, according to the power distribution system described in Patent Document 1, power is supplied from the storage battery to the second system load (peak shift load) and the third system load (peak) during the power peak time period. The power supply to the cutting load) is stopped. Therefore, peak power can be cut without increasing the capacity of the battery.

  However, in this power distribution system, since power supply to the load of the third system (peak cutting load) is stopped during the power peak time period, the load connected to the third system during the power peak time period (that is, Electrical equipment) cannot be used. Therefore, for example, when this power distribution system is applied to a factory, an office, or the like, there is a risk that work efficiency may be reduced due to load use restriction, that is, the convenience of power consumers (users) may be impaired.

  The present invention has been made in order to solve the above-described problems, and demand power that can suppress power demand appropriately and can minimize a decrease in convenience of a power consumer (user). It is an object to provide a control device and a demand power control method.

  A demand power control apparatus according to the present invention includes a measuring unit that measures power supplied to a plurality of electrical devices connected to a power system that distributes and supplies power received from a commercial power system, and supply of each electrical device A storage means for storing the relationship between the electric power and the utility value, which is an index value indicating the degree to which the function required for each electric device is exerted with respect to the supplied power, and a measuring means When the measured total amount of power supplied to each electrical device exceeds a predetermined threshold value, the utility value of each electrical device is made identical based on the threshold value. Based on the relationship between the target utility value setting means for setting the target utility value and the supply power and utility value of each electrical device stored in the storage means, the utility value of each electrical device is determined by the target utility value setting means. Below the set target utility value Supply power setting means for determining the target supply power of each electric device, and supply power control for controlling the power supplied to each electric device so as to coincide with the target supply power determined by the supply power setting means Means.

  In addition, a demand power control method according to the present invention includes a measurement step of measuring power supplied to a plurality of electrical devices connected to a power system that distributes and supplies power received from a commercial power system, and each electrical device Storage step for storing for each electric device the relationship between the supplied power and the utility value, which is an index value indicating the degree to which the function required for each electric device is exhibited with respect to the supplied power, and measurement When the total amount of power supplied to each electrical device measured by the means exceeds a predetermined threshold value, the utility value of each electrical device is the same based on the threshold value. Based on the relationship between the target utility value setting step for setting the target utility value and the supply power and utility value of each electrical device stored in the storage step, the utility value of each electrical device is the target utility value setting step. In The power supply setting step for determining the target supply power of each electric device so that the target utility value is less than or equal to the target utility value set in the step, and the electric power supply for each electric device so as to match the target power supply determined in the power supply setting step A power supply control step for controlling power to be supplied.

  According to the demand power control apparatus or the demand power control method according to the present invention, the index indicating the supply power of each electrical device and the degree to which the function required for each electrical device is exhibited with respect to the supply power. The relationship with the utility value, which is a value, is stored for each electric device, and when the total amount of power supplied to each electric device exceeds a predetermined threshold value, the threshold value is set. The target utility value is set so that the utility value of each electrical device is the same, and the utility of each electrical device is based on the relationship between the stored power supply and utility value of each electrical device. The target supply power of each electric device is determined so that the value is equal to or less than the target utility value. And the electric power supplied to each electric equipment is adjusted so that it may correspond with target supply electric power.

  That is, when the received power exceeds a predetermined threshold value, the power supplied to each electrical device is adjusted so that the utility value of all the electrical devices is the same (or lower). In other words, limited received power can be distributed and supplied to each electrical device so that the degree of function (utility) of the function of each electrical device is equal. That is, by ensuring the same utility value, it is possible to balance the functions of all the electrical devices while maintaining the received power (demand power) below a predetermined value (target value). Therefore, when the received power is limited, it is possible to limit so that an electric device whose function is extremely lowered does not appear. As a result, it is possible to minimize the decrease in convenience for power consumers (users) while appropriately suppressing power demand.

  In the demand power control apparatus or the demand power control method according to the present invention, the utility value is exhibited at a predetermined supply power with respect to the optimum value of the function that is required to be exerted on the electrical equipment. It is preferably calculated as a ratio of the degree of function.

  In this way, utility values that are different for each electrical device and that can be different for each power consumer (user) even for the same electrical device can be set individually and specifically.

  In the demand power control apparatus according to the present invention, the storage means stores, for each electric device, table data that defines the relationship between the supply power and utility value of the electric device, and the supply power setting means is set. It is preferable to search the table data using the target utility value and obtain the target supply power of each electric device.

  Further, in the demand power control method according to the present invention, in the storage step, table data defining the relationship between the supply power and utility value of the electrical device is stored for each electrical device, and the setting is performed in the supply power setting step. It is preferable to search the table data using the set target utility value and obtain the target supply power of each electric device.

  In this case, table data defining the relationship between the supply power and utility value of each electrical device is stored in advance for each electrical device, and the target supply power of each electrical device is obtained by searching the table data. It is done. Therefore, for example, the processing load can be reduced and the processing speed can be improved as compared with the case of obtaining by calculation.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the fall of the convenience of an electric power consumer (user) to the minimum, suppressing electric power demand appropriately.

It is a block diagram which shows the structure of the demand power control apparatus which concerns on embodiment. It is a figure for demonstrating the relationship between supplied electric power and utility value. It is a figure for demonstrating the setting method of a utility value-target supply electric power table, and the relationship between the total amount of the electric power supplied of each electric equipment, and a target utility value. It is a flowchart which shows the process sequence of the demand power suppression process (peak cut process) by the demand power control apparatus which concerns on embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  First, the configuration of the demand power control apparatus 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a demand power control device 1 and a high-voltage power receiving facility 5 to which the demand power control device 1 is applied. Here, the case where the demand power control device 1 is applied to a high voltage power receiving facility 5 owned by a customer of a high voltage power receiving contract such as an office or a factory will be described as an example.

  The high-voltage power receiving facility 5 is a facility for a customer to receive power from a commercial power system developed by an electric power company. In the high-voltage power receiving facility 5 illustrated in FIG. 1, the drawn commercial power system includes a DS (Disconnecting Switch) 21, a VCT (Voltage Current and Transformer) 22, an OCR (Over). -Current Relay (overcurrent relay) 23 and a VCB (vacuum circuit breaker) 24 are connected to the bus 25. The VCT 22 is connected to a WH (Watt-hour meter) 26 that measures received power and outputs a pulse signal corresponding to the received power.

  The bus 25 has a plurality of (five in the example of FIG. 1) electric power stepped down by a Tr (Transformer) 28 connected through an LBS (AC Load Break Switch) 26. A plurality of power systems 32 (five systems in the example of FIG. 1) supplied to the electrical equipment 40 (for example, lighting equipment, OA equipment, air conditioning equipment, refrigeration / refrigeration equipment, industrial machines (electric machine tools), etc.) are connected. Yes. The number of electrical systems 32 and electrical devices 40 is not limited to this embodiment (five).

  The power demand control apparatus 1 mainly includes a power meter 11, a power meter / power controller 175, a system controller 17, and the like.

  The power meter 11 detects the voltage / current / frequency transformed on the secondary side of the VCT 22. The power meter 11 is connected to the system controller 17, and the detected value is output to the system controller 17.

  Each power meter / power controller 175 is attached to each power system 32 (each electric device 40) described above, and the value of the current and voltage flowing through the power system 32, that is, the power value supplied to each electric device 40. Is detected. Further, the power meter / power controller 175 adjusts the power supplied to the connected electrical device 40 based on the supply power control information (target supply power) from the system controller 17. That is, the wattmeter / power controller 175 functions as a measurement unit and a supply power control unit described in the claims.

  The wattmeter / power controller 175 is communicably connected to the system controller 17 via, for example, a wireless LAN (or PLC: Power Line Communication) and transmits the detected power value (current value) to the system controller 17. At the same time, the supply power control information (target supply power) is received from the system controller 17.

  The system controller 17 is a CPU that performs calculations, a ROM that stores programs and data, a RAM that temporarily stores various data such as calculation results, a backup RAM that holds stored contents, and a CPU that causes the CPU to execute each process. And a storage device such as a hard disk for storing data such as application programs and table data, and an input / output I / F. The system controller 17 may be designed exclusively as a dedicated machine, or may be configured using a general-purpose programmable logic controller (PLC) or the like.

  Based on the total amount of power supplied to each electrical device 40 measured by each power meter / power controller 175 and / or the received power measured by the power meter 11, the system controller 17 (for example, The electric power supplied to each electrical device 40 is driven by driving each wattmeter / power controller 175 so that the average power value (demand power) for 30 minutes does not exceed a predetermined predetermined power value. Adjust.

  At that time, the system controller 17 has a function of minimizing a decrease in convenience for a power consumer (user) while appropriately suppressing a peak of demand power. Therefore, the system controller 17 functionally includes a storage unit 171, a target utility value setting unit 172, and a supply power setting unit 173. In the system controller 17, the functions of the storage unit 171, the target utility value setting unit 172, and the power supply setting unit 173 are realized by executing a program stored in a hard disk or the like by the CPU.

  The storage unit 171 is composed of the above-described ROM or hard disk, and is an index value indicating in advance the power supplied to each electrical device 40 and the degree to which the function required for each electrical device 40 is exhibited with respect to the supplied power. A relationship with a certain utility value is stored for each electrical device 40. That is, the storage unit 171 functions as a storage unit described in the claims.

  Here, the utility value is optimal for the function that is required to be exerted on each electrical device 40 (for example, adjusting the illuminance if it is a lighting device, and adjusting the room temperature if it is an air conditioning device). It is calculated as a ratio of the degree of function exhibited at a predetermined supply power to the value. In other words, the effective dose can also be defined as the degree of user satisfaction obtained for the output of the function of the electrical device 40.

  Here, the relationship between the supply power (power consumption) of the electrical equipment 40 and the utility value is shown in FIG. FIG. 2 is a diagram for explaining the relationship between the supply power (power consumption) of the electrical device 40 and the utility value. The utility brought about by the supplied power (the degree of function) is considered to draw a substantially S-shaped curve as shown in FIG. In other words, utility (required function) cannot be exhibited unless there is a predetermined amount of power supply. In the case where the power supply is more than a predetermined level, the utility (the degree to which the function is exhibited) increases as the power supply increases. However, when the supply power further increases to a certain value or more, the utility does not increase but decreases. For example, in the case of a lighting device, if the supplied power is small and the luminance is low, the function desired by the user as the lighting device cannot be exhibited. On the other hand, if the supplied power is large and the luminance is too high, for example, eyes are fatigued and work efficiency is reduced (utility is reduced).

  That is, the utility value is not a ratio with respect to the maximum value of the function (for example, maximum brightness, maximum temperature / minimum temperature, etc.) but a ratio with respect to an optimum value (for example, optimal brightness, optimal temperature, etc.) required by the power consumer (user) Is defined as Accordingly, the utility value varies depending on, for example, the type of the electric device 40, the type of business / business condition of the power consumer (user), the external environment, and the like.

Therefore, when determining the relationship between the supply power and utility value of each electrical device 40, first, in the above-mentioned substantially S-shaped curve, the area where the required function cannot be performed (left end side), and the increase in supply power On the other hand, the area where the function is reduced (right end side) is excluded. Further, in order to facilitate handling, the approximate S-shaped curve subjected to the above exclusion process is approximated (linear approximation) with a linear function represented by the following equation (1).
U = a · P−b (1)
However, U is a utility value, P is supplied power, a is a coefficient, and b is a constant.

  Here, the coefficient a (the slope of the utility function) in the above equation (1) represents elasticity. For example, in production equipment, etc., it requires substantially constant supply power, and if the supply power is less than that, the line will not operate and the utility will be zero (strictly, it will be partially stopped) Primary stop is also possible, and the coefficient a is considered to be not infinite). The elasticity is small and the coefficient a is large (see the electric device C indicated by the one-dot chain line in the first quadrant of FIG. 3). . Conversely, a device having a relatively high elasticity such as a lighting device has a small coefficient a (gradual inclination) (see the electric device A indicated by a solid line in the first quadrant of FIG. 3). That is, the greater the elasticity, the smaller the coefficient a (the slope of the utility function), and even if the power supply is greatly reduced, the utility does not drop rapidly.

  Further, the storage unit 171 converts the utility function (primary equation) described above for each electric device 40 into table data (utility value-target supply power table) that defines the relationship between the supply power and the utility value. Remember. Here, in the first quadrant of FIG. 3, the relationship (utility function) between the supply power and the utility value of each of the three electrical devices A, B, and C is shown. FIG. 3 is a diagram for explaining a method for setting the utility value-target supply power table and the relationship between the total amount of power supplied to each electrical device 40 and the target utility value. In this example, the relationship (utility function) between the supply power and utility value of each of the three electric devices A, B, and C shown in the first quadrant of FIG. 3 is converted into table data and stored.

  Further, the second quadrant of FIG. 3 shows the relationship between the sum of supplied power (received power) and utility value (target utility value) of each of the three electrical devices A, B, and C. In the storage unit 171, the relationship between the sum (received power) of the power supplied to each electrical device 40 and the utility value (target utility value) is stored in advance as data. Based on this relationship, a target utility value when the received power (demand power) is kept below a predetermined threshold is determined (details will be described later).

  Here, when there is a single electrical device 40, the utility is left to control of the supplied power. However, when a plurality of electrical devices 40 having different utilities provided by the supplied power are used at the same time, the total supply power and the total power The utility behavior is no longer unitary. If control is performed so that the power supplied to different electrical devices 40 is the same, the utility of each electrical device is different, and the utility of the entire system may be reduced. Therefore, the system controller 17 suppresses a decrease in the utility of the entire system by adjusting the supply power for each electric device 40 so that the utility values are the same.

  Returning to FIG. 1, the target utility value setting unit 172 indicates that the total amount of power supplied to each electrical device 40 measured by each power meter / power controller 175 (or received power measured by the power meter 11). When the predetermined threshold value is exceeded, the target utility value is set based on the threshold value so that the utility value of each electrical device 40 is the same (second quadrant of FIG. 3). reference). That is, the target utility value setting unit 172 functions as a target utility value setting unit described in the claims.

  More specifically, the target utility value setting unit 172 indicates the relationship between the sum of supplied power (received power) of each electrical device 40 stored in the storage unit 171 and the utility value (target utility value). Set the target utility value based on the data. When the target utility value (maximum demand power) is not exceeded, the utility value of each electrical device 40 can be arbitrarily adjusted. The target utility value set by the target utility value setting unit 172 is output to the supply power setting unit 173.

  The supplied power setting unit 173 is stored in the storage unit 171 so that the utility value of each electrical device 40 matches (or is less than) the target utility value set by the target utility value setting unit 172. Based on the relationship between the supply power and utility value of each electrical device 40, the target supply power for each electrical device 40 is determined. That is, the supply power setting unit 173 functions as supply power setting means described in the claims.

  More specifically, the supply power setting unit 173 searches the utility value-target supply power table using the set target utility value, and obtains the target supply power for each of the electrical devices 40 (first in FIG. 3). Quadrant reference). Here, as described above, the horizontal axis of the second quadrant in FIG. 3 indicates the sum of the supplied power of each electrical device 40 in the first quadrant, and the utility value (target) when the sum of the supplied power is suppressed to a predetermined value. Utility value) is determined as the value on the vertical axis. At that time, when looking at the first quadrant, the supply power (target supply power) allocated to each electric device 40 is obtained. The target supply power (supply power control information) of each electrical device 40 obtained by the supply power setting unit 173 is output to the wattmeter / power controller 175.

  The power meter / power controller 175 described above receives the target supply power determined by the supply power setting unit 173 via, for example, a wireless LAN (or PLC (Power Line Communication)), and matches the target supply power. Thus, the electric power supplied to each electric device 40 is adjusted.

  Next, the operation of the demand power control apparatus 1 will be described with reference to FIG. FIG. 4 is a flowchart showing a processing procedure of demand power suppression processing (peak cut processing) by the demand power control device 1. This process is repeatedly executed by the system controller 17 at a predetermined timing.

  In step S100 (corresponding to a storage step), the relationship between the power supplied to each electrical device 40 and the utility value is stored for each electrical device 40. More specifically, in this step, table data (utility value-target supply power table) that defines the relationship between the power supplied to each electrical device 40 and the utility value for each electrical device 40 is stored. Since the setting method of the utility value-target supply power table is as described above, detailed description is omitted here.

  Next, in step S102 (corresponding to a measurement step), the power value supplied to each electrical device 40 measured by each power meter / power controller 175 and the power at the power receiving point detected by the power meter 11 Is read.

  Subsequently, in step S104, a determination is made as to whether or not the total amount of power supplied to each electrical device 40, that is, the received power has exceeded a predetermined threshold value. Here, when the total amount of power supplied to each electrical device 40 exceeds a predetermined threshold, the process proceeds to step S106. On the other hand, when the total amount of power supplied to each electrical device 40 does not exceed a predetermined threshold, the process is temporarily exited.

  In step S106 (corresponding to the target utility value setting step), the target utility value is set so that the utility values of the electrical devices 40 are the same according to the predetermined threshold value. Since the method for setting the target utility value is as described above, detailed description is omitted here.

  In the subsequent step S108 (corresponding to the supply power setting step), the utility value of each electrical device 40 is set in step S106 based on the relationship between the supply power and utility value of each electrical device 40 stored in step S100. The target supply power of each electric device 40 is determined so as to be equal to (or less than) the target utility value. More specifically, the utility value-target supply power table is searched using the set target utility value, and the target supply power of each electrical device 40 is obtained.

  Then, in the subsequent step S110 (corresponding to the supply power control step), the power supplied to each electrical device 40 is adjusted so as to match the target supply power determined in step S108.

  As described above in detail, according to the present embodiment, the relationship between the power supplied to each electrical device 40 and the utility value is stored for each electrical device 40 and supplied to each electrical device 40. When the total amount of electric power exceeds a predetermined threshold value, the target utility value is set and stored so that the utility value of each electrical device 40 is the same based on the threshold value. Based on the relationship between the supply power and utility value of each electrical device 40, the target supply of each electrical device 40 so that the utility value of each electrical device 40 matches (or less than) the target utility value. Electric power is determined. And the electric power supplied to each electric equipment 40 is controlled so that it may correspond with target supply electric power.

  That is, when the received power exceeds a predetermined threshold value, the power supplied to each electrical device 40 is controlled so that the utility value of all the electrical devices 40 is the same (or less). In other words, limited received power can be distributed and supplied to each electrical device 40 so that the degree of function (utility) of each electrical device 40 is equal. In other words, by ensuring the same utility value, it is possible to balance the functions of all the electric devices 40 while keeping the received power (demand power) below a predetermined value (target value). For this reason, when the received power is limited, it is possible to limit the electric device 40 whose function is extremely lowered. As a result, it is possible to minimize the decrease in convenience for power consumers (users) while appropriately suppressing the peak of demand power.

  In particular, according to the present embodiment, the degree of function that is exhibited when predetermined power is supplied with respect to the optimum value of the function that the utility value is required to be exerted on the electrical device 40. It is calculated as the ratio. Therefore, utility values that are different for each electric device 40 and can be different for each electric power consumer (user) even for the same electric device 40 can be set individually and specifically.

  Further, according to the present embodiment, the table data (utility value-target supply power table) that defines the relationship between the supply power and utility value of each electrical device 40 is stored in advance for each electrical device 40. By searching this utility value-target supply power table, the target supply power of each electrical device 40 is obtained. Therefore, for example, the processing load can be reduced and the processing speed can be improved as compared with the case of obtaining by calculation.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the demand power control apparatus 1 has been described as an example in which the demand power control device 1 is applied to a high voltage power receiving facility (cubicle) owned by a customer of a high voltage power receiving contract such as a factory or an office. The device 1 can also be applied to peak suppression (peak cut) in a general household.

  In the above embodiment, the utility value-target supply power table is stored for each electrical device 40 in advance, and the target supply power of each electrical device 40 is obtained using the utility value-target supply power table. It is good also as a structure which calculates | requires the target supply electric power of each electric equipment 40 by (utility function).

  In the above embodiment, the case where the present invention is applied to electrical equipment has been described as an example. However, for example, in a commercial complex, the power consumption is different. For example, the present invention is applied to a restaurant, a food store, a clothing store, and the like. You can also. That is, the difference depending on the type of business / business condition can be considered as the difference in utility value with respect to the power consumption of each electric device. For example, a cooling device is more important than a lighting device in a food store, and a lighting device is more important in a clothing store.

  In the above-described embodiment, the case where the peak of demand power is cut has been described as an example. However, the present invention can also be used for suppression of demand power other than the peak (energy saving).

DESCRIPTION OF SYMBOLS 1 Demand power control apparatus 5 High voltage power receiving equipment 11 Electric power meter 17 System controller 171 Memory | storage part 172 Target utility value setting part 173 Supply electric power setting part 175 Wattmeter / power controller 32 Electric power system 40 Electric equipment

Claims (6)

Measuring means for measuring power supplied to a plurality of electrical devices connected to a power system that distributes and supplies power received from a commercial power system;
Storage means for storing, for each electrical device, the relationship between the power supplied to each electrical device and the utility value, which is an index value indicating the degree to which the function required for each electrical device is exhibited with respect to the supplied power When,
When the total amount of power supplied to each electrical device measured by the measuring means exceeds a predetermined threshold value, the relationship between the supplied power and the utility value based on the threshold value A target utility value setting means for setting a target utility value so that the utility values of all types of electrical equipment with different values are the same,
Based on the relationship between the supply power and utility value of each electrical device stored in the storage means, the utility value of each electrical device is less than or equal to the target utility value set by the target utility value setting unit. , Supply power setting means for determining the target supply power of each electrical device,
A power demand control apparatus for demand, comprising: power supply control means for controlling the power supplied to each electric device so as to coincide with the target power supply determined by the power supply setting means.   The utility value is calculated as a ratio of a degree of a function exhibited at a predetermined supply power to an optimum value of a function required to be exhibited for an electric device. The power control device for demand according to 1. The storage means stores, for each electric device, table data that defines the relationship between the power supplied to the electric device and the utility value;
The demand power control according to claim 1 or 2, wherein the supply power setting means searches the table data using a set target utility value and obtains a target supply power for each electric device. apparatus. A measurement step for measuring power supplied to a plurality of electrical devices connected to a power system that distributes and supplies power received from a commercial power system;
A storage step of storing, for each electric device, the relationship between the power supplied to each electric device and the utility value, which is an index value indicating the degree to which the function required for each electric device is exhibited with respect to the supplied power When,
When the total amount of power supplied to each electrical device measured in the measurement step exceeds a predetermined threshold value, the relationship between the supplied power and the utility value based on the threshold value A target utility value setting step for setting a target utility value so that the utility values of all of the plurality of types of electrical equipment having different values are the same,
Based on the relationship between the supply power and utility value of each electrical device stored in the storage step, so that the utility value of each electrical device is equal to or less than the target utility value set in the target utility value setting step, A supply power setting step for determining a target supply power for each electric device;
A power supply control method for demand, comprising: a power supply control step for controlling the power supplied to each electric device so as to coincide with the target power supply determined in the power supply setting step.   The utility value is calculated as a ratio of a degree of a function exhibited at a predetermined supply power to an optimum value of a function required to be exhibited for an electric device. 4. The demand power control method according to 4. In the storing step, for each electric device, storing table data defining a relationship between power supply and utility value of each electric device,
The demand power control according to claim 4 or 5, wherein, in the supply power setting step, the table data is searched using a set target utility value to obtain a target supply power for each electric device. Method.

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