JP2013099174A - Energy management system, method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of restricting utilization of energy capable of considering the fairness between user entities.SOLUTION: An energy management system has: power measurement devices 2a-2n connected to loads of users; and a management device 1 connected with power measurement devices of a plurality of users via a network. Each of the power measurement devices 2a-2n has a measurement part 201 measuring a power demand amount of the user load, and a controller 203 suppressing power demand. The management device 1 has a communication part 104 communicating measurement data with the power measurement devices, and a calculation part 103 calculating a power usage amount upper limit for each user. The management device 1 acquires the power demand for each user measured by the power measurement devices, and determines an upper limit of a power usage amount at the calculation part so that peak-to-average power ratios for the respective users are the same. The management device 1 transmits the upper limit value of the power usage amount to the power measurement devices connected to the respective users. The power measurement device suppresses the power usage amount of the user according to the transmitted upper limit value.

Description

  Embodiments described herein relate generally to an energy management system, method, and program for various devices, apparatuses, and systems.

  The conventional power supply system is an integrated operation of a centralized power source and a power transmission system. In recent years, by using information and communication technology (ICT), it is possible to integrate and utilize distributed power sources such as solar power generation and wind power generation and customer information, and to supply power with high efficiency, high quality, and high reliability. Realization of a system (called a smart grid) is desired.

  When information and communication technology is applied to various power-using devices, it becomes possible to acquire power information and control power supply and demand with finer granularity. That is, when power shortage occurs, it is possible to individually suppress power to consumers.

There are the following methods for suppressing energy use for a plurality of subjects.
(1) A method in which an electric power company uses an electric power meter having a function of starting and ending electric power supply to consumers (see, for example, Patent Document 1).
(2) A method of selectively restricting the power supply for each device according to a preset condition (for example, see Patent Document 2).
(3) A method of transmitting the arrival of the power peak time to each customer via a network and suppressing voluntary power demand on the customer side (see, for example, Patent Document 3).
(4) A method of dynamically allocating power in a data center by estimating performance loss due to power suppression (see, for example, Patent Document 4).

JP 2011-120461 A JP 2011-101536 A JP 2010-128810 A JP 2011-123873 A

  In order to reduce power consumption due to power shortage, in addition to achieving the reduction target value, it is necessary to allocate burdens that ensure fairness among the consumer entities. However, in the conventional methods for restricting and suppressing the use of energy for a plurality of entities, it has not been possible to consider the fairness among the consumer entities.

  In view of the above problems, an embodiment of the present invention aims to provide an energy management system, method, and program capable of considering fairness between consumer entities.

  The energy management system of this embodiment has the following configuration.

(1) It has a power measuring device connected to a consumer's load, and a management device connected to a plurality of consumer power measuring devices via a network.

(2) The power measuring device includes a demand amount measuring unit that measures the power demand amount of the consumer load and a control unit that suppresses the power demand of the consumer load.

(3) The management device includes a communication unit that exchanges measurement data with the power measurement device, and a calculation unit that calculates the power usage upper limit of each consumer.

(4) The management device acquires the power demand of each consumer measured by the power measuring device, and the peak-to-average power ratio (PAPR) of each consumer is the same. Determine the upper limit of power usage.

(5) The management device transmits an upper limit value of power usage to a power measurement device connected to each consumer, and the power measurement device of each customer uses the power usage of the consumer according to the transmitted upper limit value. Achieve overall energy reduction goals by controlling volume.

The block diagram which shows the structure of the energy management system which concerns on 1st Embodiment. The block diagram of the management apparatus in 1st Embodiment The block diagram of the electric power measurement apparatus in 1st Embodiment The flowchart explaining the process of 1st Embodiment. The figure which shows an example of the initial setting value by the input part of 1st Embodiment The figure which shows an example of the power consumption measured value of each consumer by the input part of 1st Embodiment The graph which shows the electric power demand of 2nd Embodiment Flowchart for explaining processing of the second embodiment Flowchart for explaining processing of the third embodiment The graph which shows the electric power demand of 4th Embodiment Flowchart explaining the process of the fourth embodiment The graph which shows the electric power demand of 5th Embodiment Block diagram showing the configuration of the sixth embodiment The flowchart explaining the process of the electric power measurement apparatus in 6th Embodiment The flowchart explaining the process of the management apparatus in 6th Embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1. First Embodiment (1) Configuration FIG. 1 shows a configuration example of an energy management system according to the present embodiment. The system of this embodiment has the power measuring devices 2a-2n provided in the management apparatus 1 and each consumer.

  As shown in FIG. 1, the management apparatus 1 is provided for each of a plurality of management units 51 connected to a power transmission / distribution system 50. This management unit 51 is composed of a certain range of areas, buildings, condominiums, factories, groups of a plurality of customers, and the like.

  In addition to the plurality of management units 51, a power source is connected to the power transmission / distribution system 50. As the power source, a power plant 52 such as hydropower, thermal power, and nuclear power, a solar power generation device 53, a wind power generation device 54, and a power storage device 55 such as an electric vehicle or a battery group provided in a building are connected. These power sources include power generation devices and power storage devices provided in areas, buildings, condominiums, etc. belonging to the management unit 51.

  In each of the management units 51, a power supply line 56 is extended from the power transmission / distribution system 50, and a plurality of loads 3a to 3n are connected to the power supply line 56 via power measuring devices 2a to 2n, respectively. . The management device 1 and the power measurement devices 2a to 2n of each load are connected by a communication line 57, and the power usage of each load measured by each of the power measurement devices 2a to 2n is transmitted to the management device 1.

  An input device 4 such as a control panel or an operation terminal is connected to the management device 1. This input device 4 is a device for inputting information necessary for calculating the upper limit value of the power usage amount of the consumer, such as the power that can be supplied and the capacity of the reserve power, and even a computer for setting information by a person. It may be a high-order energy management device.

  As shown in FIG. 2, the management device 1 includes an input unit 101 that acquires data from the input device 4, a data holding unit 102 that holds the acquired data, and a consumer's power usage based on the acquired data. It has the calculating part 103 which calculates the upper limit of quantity. In this Embodiment, this calculating part 103 is based on ratio of the peak power of each consumer's power usage measured by each power measuring device 2a-2n to average power, and the upper limit of each customer's power usage. To decide.

  The management device 1 includes a communication unit 104 that transmits the calculated upper limit value of power usage to each of the power measurement devices 2a to 2n. The communication unit 104 also has a function of receiving the power usage amount of each load measured by the power measuring devices 2 a to 2 n and storing the received power usage amount in the data holding unit 102.

  As shown in FIG. 3, the power measuring devices 2 a to 2 n are devices having a measuring unit 201 that measures the power consumption amount of each customer load and transmits it to the management device 1, and includes a smart meter (with a communication / control function). A watt-hour meter is assumed. Therefore, the power measuring devices 2a to 2n transmit the measured power amount (demand power amount of the load) to the management device 1 or receive the upper limit value of the power usage calculated by the management device 1. Have

  The power measuring devices 2 a to 2 n include a control unit 203 that limits the power usage amount of the consumer load based on the upper limit value acquired from the management device 1. The control unit 203 is connected to a switch unit 204 that limits power supplied to the loads 3a to 3n. As the switch unit 204, a chopper circuit using a thyristor or a power transistor can be used.

  The control unit 203 has an input unit 205 for inputting various data and commands for management or control to the power measurement devices 2a to 2n, data from the input unit 205, and measurement data acquired by the measurement unit 201. In addition, a storage unit 206 that stores data such as an upper limit value from the management device 1 and a display unit 207 that displays various data, the operation state of the load, and the like are provided.

(2) Operation FIG. 4 is a flowchart for explaining the processing operation of the present embodiment. A series of procedures until acquiring the power consumption amount of each consumer load and transmitting the upper limit value of the power consumption amount is shown. Show.

Hereinafter, the operation of the present embodiment will be described with reference to FIG.
In step S <b> 1, the input unit 101 of the management apparatus 1 acquires the maximum power Ps that can be supplied set by the input device 4 and the capacity Pb of reserve power. Here, the capacity Pb of the reserve power may be determined by a ratio (for example, 10%) to the maximum power Ps that can be supplied. Based on the set value acquired by the input unit 101, the overall power limit target value Pc is calculated by the equation (1).

  The value acquired or calculated in step S1 is held in the data holding unit 102, for example, in the format shown in FIG. In step S2, the power consumption values of the customer loads 3a to 3n measured by the measuring units 201 of the power measuring devices 2a to 2n are acquired via the communication unit 104 of the management device 1. These power consumption values are held in the data holding unit 102, for example, in the format of FIG.

  In step S <b> 3, the calculation unit 103 of the management device 1 determines whether or not to restrict the use of power for each consumer. As an example of the determination, when the total power consumption of each consumer becomes equal to or greater than the power limit target value Pc, the power usage limit is implemented.

In step S4, the calculation unit 103 of the management device 1 calculates a power limit target value for each consumer. Here, when the power limit value of the consumer i is pc _i , the total power limit target value imposed on each consumer is set to be equal to the overall power limit target value as shown in Equation 2. That's fine.

When setting the power limit target value so that the peak-to-average power ratio of each consumer is the same, if the peak-to-average power ratio is R and the average power consumption of the consumer _i is pmi, the relationship of Equation 3 can be satisfied. That's fine.

  From Equations 2 and 3, the peak-to-average power ratio imposed on each customer in order to achieve the overall power limit target value Pc, as shown in Equation 4, is the average power consumption of each customer and the target overall It is calculated from the power limit.

  From the above, in order to calculate the power limit target value of each consumer, first, the peak-to-average power ratio to be imposed on each consumer is calculated by Equation 4, and the power limit target value of each consumer is calculated by Equation 3. What is necessary is just to calculate.

  In step S5, the output unit 104 of the management device 1 transmits the power limit target value of each consumer calculated in step S4 to the power measuring devices 2a to 2n.

  Thereafter, the flow of steps S2 to S5 is repeatedly executed at regular time intervals (for example, 1 minute).

  Each power measuring device 2 a to 2 n that has received the power limit target value of each consumer in the communication unit 202 sends the target value to the control unit 203. The control unit 203 controls the switch unit 204 according to the target value 203 to limit the amount of power supplied from the power line 56 to each of the loads 3a to 3n.

(3) Effect In the present embodiment having the above-described configuration, the management apparatus 1 determines the upper limit of the power usage amount of each consumer based on the peak-to-average power ratio, so that the fairness among the consumer entities It is possible to limit the amount of power used in consideration of the characteristics.

2. 2nd Embodiment In the said embodiment, the calculating part 103 provided in the management apparatus 1 determined the upper limit of the electric power consumption of each consumer based on the peak-to-average power ratio. In this case, if the “peak-to-average power ratio” is calculated based on the short-term peak value, it may be considered that the actual power demand does not coincide.

  In the present embodiment, the peak of the power demand for a certain time Tc or more is set as the peak value that is the basis of the calculation, so that the short-time peak is ignored. That is, in the present embodiment, when determining the peak-to-average power ratio of each consumer, the peak value that is the basis of the calculation is determined based on the peak power value that continues for a certain time or more.

  FIG. 7 is a graph showing the electric power demand and its duration for explaining the present embodiment. In FIG. 7, W1 to W4 are peak values of power demand, respectively, and have a relationship of W3> W2> W1> W4. t1 to t4 are duration times of the respective peak values W1 to W4. In the first embodiment, the “peak-to-average power ratio” is calculated based on the largest peak value W3 regardless of the values of t1 to t4.

  On the other hand, in the present embodiment, as shown in the flowchart of FIG. In step S1, the duration t3 of the largest peak value W3 is set as the cumulative time T (T = t3). Next, in step S2, a preset reference time Tc and the accumulated time T are compared. In this case, when the accumulated time T is smaller than the reference time Tc (Tc> T), the process proceeds to step S3.

  In step S3, the time t2 of the next largest peak value W2 is added to the duration t3 of the largest peak value W3 to obtain a new accumulated time T, and the process returns to step S2, and the new accumulated time T and reference time are returned. Compare with Tc. Thereafter, this process is repeated until the accumulated time T becomes larger than the reference time Tc.

  In step S2, when the accumulated time T becomes larger than the reference time Tc (T ≧ Tc), the process proceeds to step S4. In step S4, the peak value Wn corresponding to tn added last is set as a peak value when the calculation unit 108 calculates the “peak to average power ratio”.

For example,
t3 <Tc
t3 + t2 <Tc
t3 + t2 + t1 <Tc
t3 + t2 + t1 + t4 ≧ Tc
In this case, W4 corresponding to t4 is set as a peak value for calculation.

  According to the present embodiment, it is possible to eliminate the amount of power used for a short time, and it is possible to limit the amount of power used in accordance with the actual usage of the consumer. In particular, if a peak value of a certain time or less is simply excluded, all power demand peaks that repeat a short-time peak several other times are excluded. In this embodiment, the accumulated time T and the reference time Tc are excluded. Thus, even in the case of repeating a peak for a short time, the “peak-to-average power ratio” can be calculated based on the peak value in accordance with the actual situation.

3. Third Embodiment This embodiment is a modification of the second embodiment, and in determining the peak-to-average power ratio of each consumer, the peak value that is the basis of the calculation is the peak power value within the reference time. It is determined based on the cumulative total.

  That is, in the present embodiment, the peak value is determined according to the flowchart as shown in FIG. 9 in the power demand as shown in FIG.

  In step S1 of FIG. 9, the duration t3 of the largest peak value W3 is set as the cumulative time T (T = t3). Next, in step S2, a preset reference time Tc and the accumulated time T are compared. In this case, when the accumulated time T is smaller than the reference time Tc (Tc> T), the process proceeds to step S3.

  In step S3, the time t2 of the next largest peak value W2 is added to the duration t3 of the largest peak value W3 to obtain a new accumulated time T, and the process returns to step S2, and the new accumulated time T and reference time are returned. Compare with Tc. Thereafter, this process is repeated until the accumulated time T becomes larger than the reference time Tc.

  In step S2, when the accumulated time T becomes larger than the reference time Tc (T ≧ Tc), the process proceeds to step S4. Note that the processing so far is the same as in the second embodiment. In the present embodiment, in step S4, the added average value Wave of the peak values W1 to Wn of t1 to tn is set as a peak value when the “peak-to-average power ratio” is calculated in the calculation unit 108.

For example,
t3 <Tc
t3 + t2 <Tc
t3 + t2 + t1 <Tc
t3 + t2 + t1 + t4 ≧ Tc
If
Wave = (W3 · t3 + W2 · t2 + W1 · t1 + W4 · t4) / (t3 + t2 + t1 + t4)
Is a peak value Wave for calculation.

  According to the present embodiment, the power consumption is not limited only by a short peak, and the peak exceeding the reference time Tc is used because the average value of the power consumption at the peak exceeding the reference time Tc is used as a reference. Even if there is a large variation in power consumption, it is possible to limit the amount of power used according to the actual situation.

4). Fourth Embodiment FIGS. 10 and 11 are for explaining a fourth embodiment. In the present embodiment, an average value of power values indicated by a peak equal to or higher than a predetermined reference power value Wc is used as a peak value when the “peak-to-average power ratio” is calculated. That is, in FIG. 10, the average power amount Wave of peak values W1 to W4 exceeding the reference power value Wc is set as the peak value.
Wave = (W3 · t3 + W2 · t2 + W1 · t1 + W4 · t4) / (t3 + t2 + t1 + t4)

  For example, in the case of a 120A customer, 120A × 70% = 84A corresponding to a current of 70%, and power, 100V × 84A = 8.4 kW is set as the reference power value Wc.

  In the present embodiment, as shown in the flowchart of FIG. 11, in step S1, the management device 1 extracts a peak that is larger than the reference power value Wc. In this case, although the time to extract is arbitrary, according to a consumer's usage mode, it can set suitably, such as 24 hours, the operation time of a factory, the time slot | zone which performs electric power restriction | limiting.

  In step S2, the average power Wave of the plurality of peaks extracted as described above is calculated based on the above formula. Thereafter, in step 3, the “peak-to-average power ratio” is calculated using the average power Wave as a reference, and the power consumption for each consumer is determined.

  In this embodiment, since the reference power amount Wc is determined in advance, even if there is a peak value for the average power, if the peak value is lower than the reference power amount Wc, the power It is not the basis for calculating the usage limit. In other words, for consumers with a power consumption lower than a predetermined reference power amount Wc, cooperation for power saving can be promoted by reducing the restriction on the power usage.

5. Fifth Embodiment In this embodiment, the peak value calculation method in each of the above embodiments is based on the amount of electric power W, but takes into account the power charge. That is, the power charge often varies depending on the usage time zone. Therefore, in the present embodiment, the graph indicating the power consumption W as shown in FIG. 12A is converted into a graph corrected by the cost for each time zone as shown in FIG.

Thereafter, based on the converted graph, the method described in the first to fourth embodiments, that is,
(1) Maximum peak value
(2) Peak value Wn over a certain time Tc
(3) Average value of peak values exceeding a certain time Tc Wave
(4) Average value of the peak value exceeding the reference electric energy Wc Wave
Based on one of the above, the “peak-to-average power ratio” is calculated to determine the amount of power used for each consumer, that is, the limit amount.

  According to the present embodiment, in addition to the operational effects of the above-described embodiments, the cost reduction effect when the consumer performs power limitation is easy to understand, and the power saving awareness can be further improved.

6). Sixth Embodiment The present embodiment is characterized in that, when a request is made from a consumer, the power usage amount is not limited for that time zone. Therefore, as illustrated in FIG. 13, the calculation unit 103 of the management device 1 includes a power usage amount calculation unit 103 a that performs the same calculation as that of each of the embodiments and an exemption time zone determination unit 103 b.

  That is, when data related to a time zone for which exemption of power limitation is desired is input to the input unit 205, the exemption time zone determining unit 103b receives data regarding a time zone desired to be exempted input from the input unit 205. Then, it is determined whether or not power limitation is performed, and a time zone during which the power limitation can be exempted is determined. Thereafter, based on the determination result of the exemption time zone determination unit 103b, the exemption time zone control unit 103a controls the power usage amount so as to exempt the power restriction for the time zone in which the determined exemption can be performed. The unit 203a is controlled.

  Similarly, the control part 203 of each electric power measurement apparatus 2a-2n is comprised from the electric power usage-amount control part 203a and the exemption time zone control part 203b. That is, when data related to a time zone for which an exemption of power restriction is desired is input to the input unit 205, the power restriction for the time zone determined by the data relating to the time zone desired to be exempted input from the input unit 205 is exempted. As described above, the exemption time zone control unit 203b controls the power usage amount control unit 203a.

  In addition, the input part of the time zone which desires exemption does not need to be provided in an electric power measurement apparatus part, and another location may be sufficient as it. Further, the location where the determination on whether to exempt the power restriction is performed is not limited to the management device. When each unit is connected by a communication line as in the present embodiment, the input unit, the control unit, the determination unit, and the like can function even if they are installed at remote locations.

  In the present embodiment having such a configuration, the following processing is performed on the power measuring devices 2a to 2n shown in FIG. First, in step S1, a time zone in which peak cut is desired to be exempted from the input device 4 is input to the power measuring devices 2a to 2n. In step S <b> 2, the power measurement devices 2 a to 2 n transmit this time zone to the management device 1 via the communication unit 104. This time period at the same time is also stored in the data holding unit 1.

In the management apparatus 1, as shown in the flowchart of FIG. 15, in step S1, data relating to a time period in which peak cuts from the power measuring apparatuses 2a to 2n are desired to be received is received. In step S2, it is inspected whether or not the time zones desired to be exempted transmitted from the power measuring devices 2a to 2n overlap.
In this case, if the time zones to be exempted overlap, the power usage in the overlapped time zones increases, so in step S3 it is determined to which consumer load the time zone to be exempted is assigned. .

There are various methods for assigning the exempted time zone to which consumer, for example,
(1) Select the power measuring devices 2a to 2n of the consumers that give priority in order every day.
(2) The power measuring devices 2a to 2n of consumers to be selected are randomly determined.
(3) Priorities are determined according to the amount of electricity used, public nature and urgency.
Such a method can be adopted.

  On the other hand, if the time zone that is exempted in step S2 does not overlap, in step S4, the requested time zone is set as the time zone that the customer exempts.

  In this way, after the time zone to be exempted for each customer is determined in step S3 or step S4, the time zone to be exempted is transmitted to the power measuring devices 2a to 2n of each customer in step 5. In this case, the time zone to be exempted can be set every day, or every certain time or every certain period, and accordingly, the timing for transmitting the time zone from the management device 1 to each of the power measuring devices 2a to 2n is also appropriate. Is set.

  When the time zone to be exempted from the management device 1 is transmitted, the power measuring devices 2a to 2n receive the time zone to be exempted by the communication unit 202 as shown in step S3 of the flowchart of FIG. Data regarding the time zone to be exempted is transmitted to an exemption time zone control unit 203b provided in the control unit 203, and the exemption time zone control unit 203b is connected to the power usage amount control unit 203a provided in the control unit 203 as well. In cooperation, power control will not be performed during the time of exemption.

  On the other hand, for other time zones, the power usage control unit 203a controls the switch unit 204 by any of the methods described in the above embodiments, and the load is connected to each of the power measurement devices 2a to 2n. The power supply amount for 3a to 3n is limited.

  In the present embodiment, in addition to the effects shown in each of the above embodiments, it is possible to limit power reflecting the demands of each customer. Therefore, a flexible power limiting system that can flexibly respond to the demands of the customers is provided. Can be built.

7). Other Embodiments The present invention is not limited to the above embodiments, and includes other embodiments as follows.

(1) Although each said embodiment demonstrated this invention as an energy management system which consists of the management apparatus 1 and electric power measurement apparatus 2a-2n, the energy management method performed in the management apparatus 1 and a computer are management apparatus 1. A program for functioning as is also one embodiment of the present invention.

(2) Each embodiment of the present invention is stored in a recording medium such as a magnetic disk (flexible disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), semiconductor memory, etc. as a program that can be executed by a computer. Can also be distributed.

(3) The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Management apparatus 2a-2n ... Electric power measurement apparatus 3a-3n ... Consumer load 4 ... Input device 101 ... Input part 102 ... Data holding part 103 ... Calculation part 104 ... Communication part 201 ... Measurement part 202 ... Communication part 203 ... Control Unit 204 ... Switch unit 205 ... Input unit 206 ... Storage unit 207 ... Display unit

Claims (11)

A power measuring device connected to a consumer's load, and a management device connected via a network with a plurality of consumer power measuring devices,
The power measuring device includes a measuring unit that measures the power demand of a consumer load, and a control unit that suppresses the power demand.
The management device includes a communication unit that exchanges measurement data with the power measurement device, and a calculation unit that calculates the power usage upper limit of each consumer,
The calculation unit obtains the power demand of each consumer measured by the power measuring device, and calculates the upper limit of power usage so that the peak-to-average power ratio of each consumer is the same. ,
The management device transmits the upper limit value of the power usage calculated by the arithmetic unit to a power measurement device connected to each consumer, and the control unit of the power measurement device transmits the upper limit value transmitted from the management device. In accordance with the customer's power consumption,
Energy management system characterized by   2. The energy management according to claim 1, wherein the calculation unit sets a total power limit target value imposed on each consumer so as to be equal to a power limit target value of the entire consumer. system.   The said calculating part determines the peak value used as the foundation of a calculation based on the peak power value which continues more than fixed time, when calculating | requiring the peak-to-average power ratio of each consumer. Item 3. The energy management system according to Item 2.   The calculation unit determines a peak value as a basis of calculation based on a cumulative peak power value within a reference time when determining a peak-to-average power ratio of each consumer. The energy management system according to claim 2.   When calculating the peak-to-average power ratio of each consumer, the calculation unit determines a peak value that is the basis of calculation based on an average value of power values indicated by a peak that is equal to or higher than a predetermined reference power value Wc. The energy management system according to claim 1 or 2, characterized by the above-mentioned.   The calculation unit determines a peak value that is a basis of calculation based on a value corrected by a cost in a power usage time period when determining a peak-to-average power ratio of each consumer. The energy management system according to claim 5.   The calculation unit of the management device is configured by a power usage amount calculation unit and an exemption time zone determination unit, and the control unit of each power measurement device is configured by a power usage amount control unit and an exemption time zone control unit. The energy management system according to any one of claims 1 to 6, wherein when the request is met, the power consumption is not limited for the time period. An input section for inputting data relating to a time zone for which an exemption from the power limit is desired;
An exemption time zone control unit that controls the power usage amount control unit so as to exempt the power limit of the time zone required for the data related to the time zone desired to be exempted input from the input unit;
The energy management system according to claim 7, comprising: An input section for inputting data relating to a time zone for which an exemption from the power limit is desired;
Receiving data related to a time zone desired to be exempted input from the input unit, determining whether or not to perform power limitation, and determining an exemption time zone for outputting data regarding a time zone in which power limitation can be exempted And
An exemption time zone control unit that controls the power usage amount control unit so as to exempt the power limit of the time zone in which the exemption output by the exemption time zone determination unit can be performed;
The energy management system according to claim 7, comprising: An energy management method for outputting a command for limiting energy demand to a plurality of consumers,
Obtaining a consumer's energy demand measurement from a device that measures the consumer's energy demand;
Obtaining energy demand limits for the entire consumer;
Calculating the average energy demand for each customer from the energy demand measurements;
Calculating a peak-to-average power ratio from an energy demand limit value of the entire consumer and an integrated value of the average energy demand of each consumer;
Calculating an energy demand limit value of each consumer from the peak-to-average power ratio and the average energy demand of each consumer;
Transmitting the energy demand limit value of each consumer to a device that limits the energy demand of each consumer;
The energy management method characterized by having. Computer
A means for obtaining a consumer energy demand measurement from a consumer energy demand measuring device;
Means for obtaining the energy demand limit for the entire consumer;
Means for calculating an average energy demand of each consumer from the measured energy demand;
Means for calculating a peak-to-average power ratio from the overall energy demand limit value and an integrated value of the average energy demand of each consumer;
Means for calculating the energy demand limit value of each consumer from the peak-to-average power ratio and the average energy demand of each consumer;
Means for transmitting the energy demand limit value of each consumer to a device that limits the energy demand of each consumer;
Energy management program to function as.

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