JP6148120B2 - Energy management apparatus, energy management method, and energy management system - Google Patents

Description

  The present invention relates to an energy management device, an energy management method, and an energy management system that suppress variations in daily demand power in the same time zone.

  In the past, the electricity retail business was monopolized by general electric utilities, but with the enforcement of the revised Electricity Business Law, the liberalization of electricity retailing has become partly permitted.

  For example, a power producer and supplier (PPS) is permitted to retail power to large consumers with contracted power of 50 kW or more. For large-scale consumers, there is an advantage that the power cost can be reduced by selecting an electric power company that can be contracted under advantageous conditions. In relation to a specific scale electric power company, various inventions related to cost reduction have been proposed (see, for example, Patent Document 1).

  FIG. 9 is a diagram conceptually illustrating a state in which a special scale electric power supplier supplies power to a consumer. The specific scale electric power company 220 receives supply of electric power from the electric power supplier 210. Here, the power supplier is a business operator having power generation facilities such as a general electric power business operator.

  The specific electric power company 220 supplies the power supplied from the power supplier 210 to the contracting consumer 240 via the power transmission / distribution network 230. Here, the power transmission / distribution network 230 is normally managed by a general electric utility.

  Since the power supplier 210 needs to estimate the necessary power generation amount and make a power generation plan, the power supplier 210 notifies the specific scale electric power company 220 of one day of the predicted value of the demand power amount in units of 30 minutes, for example.

  When the electric power actually supplied from the electric power supplier 210 (demand electric energy) is close to the predicted electric power consumption (for example, within ± 3%), the specific scale electric power company 220 has a relatively low imbalance fee. The cost can be reduced. On the other hand, for example, when the demand power amount becomes 3% or more larger than the predicted demand power amount, the specific-scale electric power company 220 has a high cost for the power amount exceeding the predicted demand power amount. Imbalance charges are incurred. Further, when the demand power amount becomes 3% or less smaller than the predicted demand power amount, the power supplier 210 does not purchase the surplus. Therefore, it is preferable for the specific scale electric power company 220 not to simply reduce the amount of power demand but to bring the amount of power demand close to the predicted amount of power demand.

  The reason why the power supplier 210 sets an imbalance fee that is relatively low when the demand power amount is close to the predicted demand power amount is that it is easy to make a power generation plan even from the viewpoint of the power supplier 210. Because there is merit. Therefore, the specific-scale electric power company 220 expects profits from the business because it can reduce the imbalance fee to the power supplier 210 when it has a track record of operating with the power demand in the range close to the predicted power demand. I can do it.

JP 2001-327081 A

  The specific scale electric power company 220 needs to accurately predict the demand power amount of the next day in order to suppress the imbalance charge to the power supplier 210. It is large and it has been difficult to accurately predict from the past power consumption.

  In addition, if there is a large variation in daily power consumption in the same time zone, the difference between the predicted demand power amount and the actual demand power amount may exceed the range where the specific-scale electric utility 220 can make the imbalance fee cheap. Therefore, there is a problem that the imbalance fee that the specific-scale electric power company 220 pays to the power supplier 210 becomes expensive, and as a result, the cost is likely to increase.

  In addition, when the imbalance fee paid by the specific scale electric power provider 220 to the power supplier 210 is high, there is a possibility that the charge for the consumer 240 to purchase electric power from the specific scale electric power provider 220 will be high as a result. There was a problem of high.

  Therefore, the objective of this invention made | formed in view of this point is to provide the energy management apparatus, energy management method, and energy management system which can make the difference of an estimated demand electric energy and an actual demand electric energy small. is there.

In order to solve the above-described problem, an energy management device according to the present invention includes a communication unit that acquires power consumption information, and a future predicted demand power amount that is notified to a power company based on the power consumption information. A control unit that calculates a target range of the control unit, wherein the control unit controls the storage battery so that the amount of power demand does not deviate from the target range, calculates the target range for each predetermined time period, and starts each time period A current rate of change in power consumption is calculated from a short-term power consumption immediately after, and the storage battery is controlled so as not to deviate from the target range based on the rate of change in power consumption in each time period. It is what.

Moreover, in the energy management apparatus according to the present invention, it is preferable that the control unit calculates a past average value of the rate of change of the power consumption amount for each predetermined time period from the power consumption amount for a predetermined number of days. .

  Moreover, the energy management apparatus which concerns on this invention WHEREIN: It is preferable that the said predetermined | prescribed time period is the time length used as the reference | standard of an electricity bill determination with the said electric power provider.

  In the energy management apparatus according to the present invention, it is preferable that the predetermined time period is a time length that serves as a reference for a basic fee that is set separately from a monthly pay-as-you-go fee with the power provider. .

  Further, in the energy management device according to the present invention, the control unit, in each time period, when the current rate of change is larger than the average value of the past rate of change, and the amount of power demand is likely to exceed the upper limit of the target range. The storage battery is preferably discharged.

  Further, in the energy management device according to the present invention, the control unit, in each time period, when the current rate of change is smaller than the average value of the past rate of change, and the amount of power demand is likely to fall below the lower limit of the target range. It is preferable to charge the storage battery.

  In the energy management device according to the present invention, it is preferable that the control unit switches between discharging and charging in the predetermined time unit.

  Moreover, in the energy management apparatus according to the present invention, the control unit stops discharging the storage battery when the demand power amount is likely to fall below a lower limit of the target range as a result of discharging the storage battery. Is preferred.

  Moreover, in the energy management device according to the present invention, the control unit stops charging the storage battery when the demanded power amount is likely to exceed the upper limit of the target range as a result of charging the storage battery. Is preferred.

  Moreover, the energy management apparatus which concerns on this invention WHEREIN: It is preferable that the said control part utilizes the data used with the demand controller outside the said energy management apparatus as information of the said power consumption.

Moreover, in order to solve the said subject, the energy management method which concerns on this invention is the step which acquires the information of power consumption, and the future estimated demand power notified to a power provider based on the information of the said power consumption. A step of calculating a target range from the amount, a step of controlling the storage battery so that the amount of power demand does not deviate from the target range, a step of calculating the target range for each predetermined time period, and a short-term immediately after the start of each time period Calculating the current rate of change of the power consumption from the amount of power consumed between and controlling the storage battery so as not to deviate from the target range based on the rate of change of the power consumption in each time period It is characterized by this.

Moreover, in order to solve the said subject, the energy management system which concerns on this invention is an energy management system provided with an energy management apparatus and a storage battery, Comprising: The said energy management apparatus is a communication part which acquires the information of power consumption. A control unit that calculates a target range of future predicted demand power amount to be notified to an electric power company based on the information on the power consumption amount, and the control unit does not deviate from the target range. The storage battery is controlled as described above, the target range is calculated for each predetermined time period, the current change rate of the power consumption is calculated from the power consumption for a short time immediately after the start of each time period, and the consumption in each time period is calculated. The storage battery is controlled so as not to deviate from the target range based on the rate of change of the electric energy .

  According to the present invention, the difference between the predicted demand power amount and the actual demand power amount can be reduced.

It is a block diagram showing a schematic structure of an energy management system concerning one embodiment of the present invention. It is a block diagram which shows schematic structure of the energy management apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example for several days of a day movement of power consumption. It is a figure which shows an example of the target range of demand electric energy. It is a figure which shows a mode that a storage battery is discharged or charged so that demand electric energy may not remove | deviate from the target range. It is a figure which shows an example in case power consumption amount is anticipated exceeding the upper limit of a target range. It is a figure which shows an example in case power consumption is anticipated to fall below the minimum of a target range. It is a block diagram which shows schematic structure of the energy management system which concerns on other embodiment of this invention. It is a figure which shows notionally a mode that a special scale electric power supplier supplies electric power to a consumer.

  Embodiments according to the present invention will be described below.

  First, an outline of an energy management system according to an embodiment of the present invention will be described. The energy management system which concerns on one Embodiment of this invention is an energy management system for a consumer to manage energy in one shop, for example. The electric power company 60 in FIG. 1 to be described later corresponds to, for example, a specific scale electric power company. The commercial power supply 50 in FIG. 1 is purchased by an electric power company 60 (a specific scale electric power company) from a power supplier such as a general electric power company, and is used for demand through a power transmission and distribution network managed by the general electric power company. It represents the power supplied to the person.

  FIG. 1 is a block diagram showing a schematic configuration of an energy management system according to an embodiment of the present invention. An energy management system 10 according to an embodiment of the present invention includes an energy management device 11, a smart meter 12, a power conditioner 13, a solar power generation system 14, a storage battery 15, a distribution board 16, and a load device 17.

  In FIG. 1, a solid line connecting each functional block represents a flow of electric power. Further, in FIG. 1, a broken line connecting each functional block represents a control signal or a flow of information to be communicated. The communication indicated by the broken line may be wired communication or wireless communication.

  Various methods can be adopted for communication of control signals and information including each layer. For example, for communication between the energy management apparatus 11 and the smart meter 12 and the power conditioner 13, communication using a short-range communication method such as ZigBee (registered trademark) can be employed. In addition, on the lower layers including the physical layer, various protocols such as ZigBee SEP2.0 (Smart Energy Profile 2.0), ECHONET Lite (registered trademark), etc. are given a degree of freedom, and only the upper layer is provided. The specified communication protocol may be combined with a communication protocol that defines a physical layer, such as WiFi (registered trademark) or PLC (Power Line Communication).

  The energy management system 10 loads the electric power supplied from the commercial power supply 50, the electric power generated by the solar power generation system 14, and the discharged electric power out of the electric power charged in the storage battery 15 via the distribution board 16. It can be supplied to the device 17.

  The energy management apparatus 11 is an energy management apparatus that manages the energy of one store, for example. The energy management device 11 manages the self-consumption ratio in the power generated by the solar power generation system 14 or manages the charge / discharge of the storage battery 15 via the power conditioner 13. Details of the function of the energy management apparatus 11 will be described later.

  The smart meter 12 is connected to the commercial power source 50 and measures the amount of power (demand power amount) supplied from the commercial power source 50. The smart meter 12 measures the power consumed by the load device 17 in the energy management system 10 (power consumption). The smart meter 12 can notify the energy management apparatus 11 of the measured electric energy.

  The power conditioner 13 converts direct current (DC) power supplied from the solar power generation system 14 and the storage battery 15 into alternating current (AC) power. The power conditioner 13 supplies the converted alternating-current power to each load device 17 through a branching system branched into a plurality by the distribution board 16.

  Further, the power conditioner 13 can also sell the converted AC power to the power company via the distribution board 16 when there is a surplus in the power generated by the solar power generation system 14. Further, the power conditioner 13 can convert AC power supplied from the commercial power supply 50 into DC power for charging the storage battery 15.

  The solar power generation system 14 generates power using sunlight. For this reason, the solar power generation system 14 includes a solar battery, and converts sunlight energy into DC power. In this embodiment, the solar power generation system 14 assumes a mode in which, for example, a solar panel is installed on the roof of a house and power is generated using sunlight. However, in this invention, the solar power generation system 14 can employ | adopt arbitrary things, if the energy of sunlight can be converted into electric power.

  The photovoltaic power generation system 14 is under the jurisdiction of the energy management device 11, and the electric power generated by the photovoltaic power generation system 14 is converted into alternating current by the power conditioner 13 and then sent to each load device 17 as described above. It can be supplied and / or sold to a power company. Further, the storage battery 15 may be rechargeable by the power generated by the solar power generation system 14, and may be configured to be supplied to the load device 17 with a direct current.

  The storage battery 15 is under the jurisdiction of the energy management device 11 and can supply power to the load device 17 by discharging the charged power. The storage battery 15 can be charged with electric power supplied from the commercial power supply 50 or the solar power generation system 14. As shown in FIG. 1, the electric power discharged from the storage battery 15 can also be supplied to each load device 17 and the energy management device 11.

  The distribution board 16 divides the supplied power into a plurality of branches and distributes them to each load device 17.

  In FIG. 1, the number of load devices 17 connected to the energy management system 10 can be any number. The load device 17 is connected to the power conditioner 13 via the distribution board 16 and supplied with power.

  Next, the operation of the energy management apparatus 11 will be specifically described. FIG. 2 is a block diagram showing a schematic configuration of the energy management apparatus according to the embodiment of the present invention. The energy management device 11 includes a communication unit 111 and a control unit 112.

  The communication unit 111 acquires information on the power consumption consumed by the load device 17 in the store or the like managed by the energy management system 10 from the smart meter 12. Note that the communication unit 111 may acquire power consumption information from a demand controller (not shown) outside the energy management apparatus 11.

  The control unit 112 causes the storage medium 25 to store information on the power consumption acquired by the communication unit 111. The storage medium 25 may be connected to the outside of the energy management apparatus 11 or may be built in the energy management apparatus 11.

  FIG. 3 is an example in which the information on the power consumption acquired by the communication unit 111 is displayed by being overlapped for five days. As shown in FIG. 3, the power consumption in the energy management system 10 usually varies from day to day.

  FIG. 4 is an example of a graph in which the control unit 112 calculates an average value and a target range in a predetermined time period from data as shown in FIG. A solid line is an average value, and a broken line indicates an upper limit and a lower limit of the target range.

  Here, the predetermined time period is a length of time used as a reference for determining an electric charge in a contract between a store managed by the energy management system 10 and the electric power company 60, for example, 30 minutes. . This time period is also referred to as a demand time period, and is a time length that serves as a basis for the basic charge. The monthly pay-as-you-go charge is also calculated based on the amount of power for each demand time period.

  The control unit 112 calculates a target range for each predetermined time period based on a statistical value of power consumption for a predetermined number of days in the past. Hereinafter, an example of the calculation method will be specifically described.

  The control unit 112 averages the power consumption data for a predetermined number of days in the past and calculates an average value. For example, the control unit 112 averages data for the last 14 days from 9:00 am to 9:30 am, and calculates an average value of power consumption in the time period from 9:00 am to 9:30 am To do. When the demand time period is 30 minutes, one day consists of 48 time periods. In this case, the control unit 112 calculates the average value for all the 48 time periods by the method described above.

  In addition, the control unit 112 calculates a standard deviation from the power consumption data for a predetermined past number of days in each time period. For example, the control unit 112 calculates the standard deviation of the power consumption in the time period from 9 am to 9:30 am from the data for the latest 14 days from 9 am to 9:30 am.

  For each time period, the control unit 112 calculates the upper limit of the target range using, for example, the following mathematical formula.

In the above equation (1), P ₁ is the upper limit of the target range of demand power amount, the average value of P _a power consumption amount, sigma is the standard deviation of the energy consumption, alpha is a predetermined coefficient. The predetermined coefficient α is a value determined so that charging / discharging can be secured within a range satisfying the specifications of the storage battery 15.

  For each time period, the control unit 112 calculates the lower limit of the target range using, for example, the following mathematical formula.

In the above equation (2), P ₂ is the lower limit of the target range of demand power amount, the average value of P _a power consumption amount, sigma is the standard deviation of the energy consumption, beta is a predetermined coefficient. The predetermined coefficient β is a value determined so that charging / discharging can be secured within a range satisfying the specifications of the storage battery 15. The coefficient β may be the same value as α or a different value.

  The control unit 112 notifies the power provider 60 of data within the target range as a future predicted demand power amount, for example, a predicted demand power amount on the next day. For example, the control unit 112 can use the average value as the predicted demand power amount.

  The control unit 112 may notify the electric power provider 60 of the predicted demand power amount via the smart meter 12, or notify the electric power provider 60 of the predicted demand power amount via the network 70. Also good. In addition, the electric power company 60 collects the predicted electric power demand notified from a plurality of contracted users, and uses the electric power supply 60 of the general electric power company or the like as the electric power supplier 60 as a whole. The person in charge.

  The control unit 112 updates the target range every day. That is, when acquiring the new power consumption data for one day, the control unit 112 replaces the oldest one day of power consumption data with the new power consumption data, and sets the average value of the power consumption and the target range. Calculate the upper limit and the lower limit of the target range. Note that it is not essential for the control unit 112 to update the target range every day, and the update frequency may be adjusted as appropriate, such as updating every few days.

  When calculating the target range, the control unit 112 controls the storage battery 15 via the power conditioner 13 so that the actual amount of power demand does not deviate from the target range. Specifically, when the power consumption amount is likely to exceed the upper limit of the target range, the control unit 112 performs control so that the storage battery 15 is discharged, and reduces the power supplied from the commercial power supply 50. In addition, when the amount of power consumption is about to fall below the lower limit of the target range, the control unit 112 controls the storage battery 15 to be charged and increases the power supplied from the commercial power supply 50.

  FIG. 5 shows a state in which the control unit 112 controls the storage battery 15 so that the demand power amount does not exceed the target range.

  In FIG. 5, the control unit 112 discharges the storage battery 15 when indicated by A1, A2, and A3, that is, when the power consumption amount on the day is likely to exceed the upper limit of the target range. The amount of power demand received from the commercial power supply 50 is reduced.

  Further, the control unit 112 causes the storage battery 15 to be charged when indicated by B1 and B2 in FIG. 5, that is, when the power consumption of the day is likely to fall below the lower limit of the target range. The amount of power demand received from the commercial power source 50 is increased.

  With reference to FIG. 6, an example of an operation in which the control unit 112 performs control to discharge the storage battery 15 when the power consumption amount on the day is likely to exceed the upper limit of the target range will be described.

  FIG. 6 is a graph of time on the horizontal axis and power consumption on the vertical axis. The horizontal axis shows from the start to the end of a certain demand period. Hereinafter, the time at which the demand time period starts is referred to as the beginning of the demand time period, and the time at which the demand time period ends is referred to as the end time of the demand time period. FIG. 5 is an example when the demand time limit is 30 minutes, for example, a graph of 30 minutes from 9 am to 9:30 am. Note that the demand time limit of 30 minutes is merely an example, and is not limited to 30 minutes.

  The vertical axis indicates the power consumption amount within the demand time period, and the power consumption amount at the beginning of the demand time period is described as zero.

  The average value of the power consumption change rate shown in FIG. 6 is obtained by averaging a straight line connecting the power consumption amounts at the beginning and end of the demand time period for a predetermined number of days in the past (for example, 14 days). The control unit 112 calculates the average value of the change rate of the power consumption for all the time periods based on the data of the power consumption for a predetermined number of days in the past.

  The control unit 112 calculates the current change rate of the power consumption from the short-time power consumption from the start of the demand time period to the predetermined time t0, and predicts the power consumption at the end of the demand time period. In the example illustrated in FIG. 6, the current change rate of the power consumption amount is larger than the average value of the past change rates of the power consumption amount, and the predicted power consumption amount exceeds the upper limit of the target range. In this case, the control unit 112 performs control so that the storage battery 15 is discharged by the amount that the predicted power consumption exceeds the upper limit of the target range so that the demand power does not exceed the upper limit of the target range.

  If the control part 112 is controlled to discharge the storage battery 15, it will maintain the state which discharged the storage battery 15 until the end of the demand period.

  The control unit 112 continues to monitor the power consumption even after the predicted power consumption exceeds the upper limit of the target range and the storage battery 15 is controlled to be discharged. For example, as a result of discharging the storage battery 15, if the power consumption thereafter decreases more than expected and the power consumption is about to fall below the lower limit of the target range, the control unit 112 stops discharging the storage battery 15. .

  Next, with reference to FIG. 7, an example of an operation in which the control unit 112 performs control to charge the storage battery 15 when the power consumption amount on the day is about to fall below the lower limit of the target range will be described.

  The control unit 112 calculates the current change rate of the power consumption from the short-time power consumption from the start of the demand time period to the predetermined time t0, and predicts the power consumption at the end of the demand time period. In the example shown in FIG. 7, the current rate of change in power consumption is smaller than the average value of the rate of change in past power consumption, and the predicted power consumption is below the lower limit of the target range. In this case, the control unit 112 controls the storage battery 15 to be charged as much as the predicted power consumption is below the lower limit of the target range so that the demand power does not fall below the lower limit of the target range.

  If the control part 112 is controlled to charge the storage battery 15, it will maintain the state which charges the storage battery 15 until the end of a demand time limit.

  The control unit 112 continues to monitor the power consumption even after the predicted power consumption is below the lower limit of the target range and the storage battery 15 is controlled to be charged. For example, as a result of charging the storage battery 15, when the subsequent power consumption increases more than expected and the demand power amount is likely to exceed the upper limit of the target range, the control unit 112 stops charging the storage battery 15. .

  In the example shown in FIGS. 6 and 7, the control unit 112 assumes that the rate of change of the power consumption from the start of the demand time period to the time t0 continues until the end of the demand time period, and the consumption at the end of the demand time period. Although the amount of power is predicted, the method of predicting the amount of power consumption is not limited to this. For example, the control unit 112 may predict the power consumption amount at the end of the demand time period by approximating the power consumption amount at more measurement points with a higher-order function.

  In the example shown in FIGS. 6 and 7, the control unit 112 predicts the power consumption at the end of the demand period with the slope of the time from the start of the demand period to the time t0. Is an example and is not limited to this. For example, the control unit 112 may predict the power consumption amount using data on the power consumption amount for the time period prior to the start of the demand time period. Specifically, for example, when predicting the power consumption from 9:00 to 9:30, the control unit 112 uses the data on the power consumption from 8:30 to 9:00 or the earlier demand time limit. You may predict using the data of power consumption of.

  The control unit 112 of the energy management apparatus 11 controls the storage battery 15 in this way, so that the demand power amount can be leveled so as to be within the target range.

  In addition, when the power consumption amount is likely to exceed the upper limit of the target range, the control unit 112 replaces or discharges the storage battery 15 with a ratio of turning the power generated by the solar power generation system 14 into private consumption. It may be increased. That is, the control unit 112 controls the power conditioner 13 so as to reduce the amount of power sold from the solar power generation system 14 to the power company and increase the usage amount of the load device 17.

  Thus, according to the present embodiment, the energy management device 11 calculates the target range of the future predicted demand power amount, and controls the storage battery 15 so that the demand power amount does not deviate from the target range. It is possible to suppress variations in daily power demand in the band. In addition, when the energy management apparatus 11 of each customer for whom the contract has been made suppresses the variation in the daily demand power amount in the same time zone, the power provider 60 has a variation in the demand power amount as a whole of the power provider 60. The power supply can be received at low cost from a power supplier such as a general electric utility. In addition, when the power supplier 60 can receive power supply from the power supplier at a low cost, as a result, the customer is more likely to be able to make a contract with the power supplier under favorable conditions. It can be expected to reduce power costs. In addition, for the power supplier, it is preferable for the electric power provider 60 to suppress variations in daily demand power amount in the same time zone because it is easy to make a power generation plan.

  In addition, the energy management device 11 calculates a past average value of the rate of change of the power consumption for each predetermined time period from the power consumption for a predetermined number of days, and the power consumption for a short time immediately after the start of each time period From the above, the current rate of change in power consumption is calculated, and the storage battery 15 is controlled so as not to deviate from the target range based on the rate of change in power consumption in each time period. Variations in the amount of power can be suppressed, and the amount of power demand can be easily grasped.

  Further, the energy management device 11 discharges the storage battery 15 when the current rate of change is larger than the average value of the past rate of change and the amount of power demand is likely to exceed the upper limit of the target range, and the current rate of change is When the power consumption is likely to be below the lower limit of the target range when the demand rate is smaller than the average value of the change rate, charging the storage battery 15 can suppress the variation in the daily demand power in the same time zone. The amount of power can be easily grasped.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

  In the present embodiment, the case where the system configuration is based on the assumption that surplus power among the power generated by the solar power generation system 14 is sold to an electric power company has been described as an example. Other system configurations may be adopted. That is, as shown in FIG. 8, it is preferable to similarly charge and discharge the storage battery 15 even in the case of a system configuration corresponding to the total purchase system.

DESCRIPTION OF SYMBOLS 10 Energy management system 11 Energy management apparatus 12 Smart meter 13 Power conditioner 14 Solar power generation system 15 Storage battery 16 Distribution board 17 Load apparatus 25 Storage medium 50 Commercial power supply 60 Electric power supplier 70 Network 111 Communication part 112 Control part

Claims (12)

A communication unit that obtains information on power consumption;
A control unit that calculates a target range of future predicted demand power amount to be notified to the power company based on the information of the power consumption amount,
The controller is
Control the storage battery so that the amount of power demand does not deviate from the target range ,
Calculating the target range for each predetermined time period;
Calculate the current rate of change in power consumption from the short-term power consumption immediately after the start of each time period,
An energy management apparatus that controls a storage battery based on a rate of change of power consumption in each time period so as not to deviate from the target range . The energy management device according to claim 1, wherein the control unit calculates a past average value of a change rate of the power consumption amount for each predetermined time period from the power consumption amount for a predetermined number of days. Energy management device. The energy management apparatus according to claim 1 or 2 , wherein the predetermined time period is a time length that is a reference for determining an electricity rate with the electric power company. 3. The energy management device according to claim 1 or 2 , wherein the predetermined time period is a time length that is a basis of a basic fee that is set separately from a monthly pay-as-you-go fee with the electric power company. Energy management device characterized by 3. The energy management device according to claim 2 , wherein the control unit is configured such that, in each time period, the current rate of change is greater than an average value of past rate of change, and the amount of power demand is likely to exceed the upper limit of the target range. An energy management device for discharging the storage battery. In the energy management apparatus according to claim 2 or 5, wherein, in each time period, the current change rate is smaller than the average value of the past variation rate, it likely demand power amount is below the lower limit of the target range In the case, the energy management apparatus is characterized in that the storage battery is charged. In the energy management apparatus according to any one of claims 1 to 6, wherein the control unit, the energy management apparatus characterized by switching the discharging or charging at the predetermined timed basis. 6. The energy management device according to claim 5 , wherein, as a result of discharging the storage battery, the control unit stops discharging the storage battery when a demand power amount is likely to fall below a lower limit of the target range. Energy management device characterized by The energy management device according to claim 6 , wherein, as a result of charging the storage battery, the control unit stops charging the storage battery when a demand power amount is likely to exceed an upper limit of the target range. Energy management device characterized by The energy management device according to any one of claims 1 to 9 , wherein the control unit uses data used in a demand controller outside the energy management device as the information on the power consumption amount. Energy management device. Obtaining power consumption information;
Calculating on the basis of the power consumption of the information, the target range of future predicted power demand amount notified to the power company,
Controlling the storage battery so that the amount of power demand does not deviate from the target range ;
Calculating the target range for each predetermined time period;
Calculating the current rate of change of power consumption from the power consumption for a short time immediately after the start of each time period;
And a step of controlling the storage battery so as not to deviate from the target range based on a rate of change of power consumption in each time period . An energy management system comprising an energy management device and a storage battery,
The energy management device includes:
A communication unit that obtains information on power consumption;
A control unit that calculates a target range of future predicted demand power amount to be notified to the power company based on the information of the power consumption amount,
The controller is
Controlling the storage battery so that the amount of power demand does not deviate from the target range ;
Calculating the target range for each predetermined time period;
Calculate the current rate of change in power consumption from the short-term power consumption immediately after the start of each time period,
An energy management system that controls a storage battery so as not to deviate from the target range based on a rate of change of power consumption in each time period .

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