JP6208614B2 - 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, power producers and suppliers (PPS) are allowed to retail electricity to large consumers with contracted power of 50 kW or more. For large consumers, there is an advantage that the power cost can be reduced by selecting an electric power company that can make a contract 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. 12 is a diagram conceptually showing a state in which a specific scale electric power company (electric power company) 220 supplies electric power to consumers. The specific scale electric power company 220 receives power supply from the general electric power company 210. Here, the general electric power company 210 is a business having power generation facilities such as an electric power company.

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

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

  The specific-scale electric power company 220 compares the imbalance charges when the amount of power actually supplied from the general electric power company 210 (demand power amount) is close to the predicted demand power amount (for example, within ± 3%). 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. Moreover, when the amount of demand power becomes 3% or less smaller than the predicted amount of demand power, the general electric utility 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 that the general electric utility 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 general electric utility 210. Because there is merit such as. Therefore, if the specific-scale electric power company 220 has a track record of operating with a demand power amount in a range close to the predicted power demand amount, the imbalance fee paid to the general electric power company 210 can be reduced. Can be expected.

  By the way, in order to suppress the imbalance charge to the general electric utility 210, the specific-scale electric utility 220 needs to accurately predict the demand power amount of the next day, but the daily power consumption amount in the same time zone. It was difficult to predict with high accuracy from past power consumption.

  And if the variation of the daily power consumption amount in the same time zone is large, the difference between the predicted demand power amount and the actual demand power amount becomes large, and there is a high possibility that the imbalance fee will be out of the range where the cost is low. As a result, there is a problem that the imbalance fee paid by the specific scale electric power company 220 to the general electric power company 210 becomes expensive, resulting in an increase in cost.

  In addition, if the imbalance fee that the specific-scale electric power company 220 pays to the general electric power company 210 becomes high, there is a possibility that the charge for the consumer 240 to purchase power from the specific-size electric power company 220 will increase as a result. There was a problem of high.

  To deal with such a problem, for example, Patent Document 2 discloses a power control / management system using an auxiliary power source that can supply power to consumers without going through a power transmission network.

JP 2001-327081 A Japanese Patent Laid-Open No. 2003-32899

  However, the auxiliary power source described in Patent Document 2 supplements the consumer with power using the power of the auxiliary power source when the amount of generated power from the power generation company decreases. Therefore, when a photovoltaic power generation system is connected based on the total purchase system, if there is a difference between the planned purchase value and the actual power generation amount, the imbalance fee will be reduced even if an auxiliary power source is used. I couldn't.

  Accordingly, an object of the present invention made in view of such points is to provide an energy management device and an energy that can balance the supply and demand of electric energy when a photovoltaic power generation system is connected based on the total purchase system. It is to provide a management method and an energy management system.

  In order to solve the above-described problem, an energy management device according to the present invention is based on a communication unit that acquires power consumption and information on the amount of power generated by a solar power generation system, and a power provider based on the information on the power consumption. And a control unit that calculates a target range of future predicted demand power amount to be notified to the current power generation amount of the photovoltaic power generation system connected to the power system based on a power purchase system and A purchase plan value of generated power is acquired via a network, and the control unit corrects the target range based on a difference between the current generated power amount and the purchase plan value, and a demand power amount is the target range. The charge / discharge of the storage battery is controlled so as not to deviate from the above.

  In the energy management device according to the present invention, it is preferable that the control unit calculates the target range for each predetermined time period.

  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. .

  In the energy management apparatus according to the present invention, the control unit calculates a change rate of the power consumption amount or a past statistical value of the change amount for each predetermined time period from the power consumption amount for a predetermined number of days. The current change rate or change amount of power consumption is calculated from the short-time power consumption immediately after the start of each time period, and based on the current change rate or change amount of power consumption in each time period, It is preferable to control the storage battery so as not to deviate from the target range.

  Further, in the energy management device according to the present invention, the control unit, in each time period, the current change rate or change amount is larger than a past change rate or change amount statistical value, and the demand power amount is within the target range. When the upper limit is likely to be exceeded, the storage battery is preferably discharged.

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

  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.

  In the energy management device according to the present invention, the control unit calculates a change rate of the generated power amount or a past statistical value of the change amount for each predetermined time period from the generated power amount for a predetermined number of days. The current rate of change or amount of change in the amount of generated power is calculated from the amount of power generated in the short term immediately after the start of each time period, and based on the current rate of change or amount of change in the amount of power generated in each time period, It is preferable that the amount of generated power at the end of the time limit is predicted, and the target range is corrected based on the difference between the predicted value of the generated power amount and the purchase plan value.

  Further, in the energy management device according to the present invention, the control unit, in each time period, the change rate or change amount of the current generated power amount is larger than the change rate or change amount statistical value of the past generated power amount, When the amount of power demand in each time period is likely to exceed the purchase plan value, the target range is preferably corrected upward.

  Further, in the energy management device according to the present invention, the control unit, in each time period, the change rate or change amount of the current generated power amount is smaller than a past change rate or change amount statistical value of the generated power amount, When the amount of power demand in each time period is likely to fall below the purchase plan value, the target range is preferably corrected downward.

  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 acquiring a current generation power amount of the photovoltaic power generation system connected to the power system based on a power purchase system and a purchase plan value of the generated power via a network, Correcting the target range based on the difference between the current power generation amount and the purchase plan value, and controlling charging / discharging of the storage battery so that the demand power amount does not deviate from the target range. It is characterized by.

  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 the power company based on the information on the power consumption amount, and the communication unit is connected to the power system based on a power purchase system. The current generation power amount of the connected photovoltaic power generation system and the purchase plan value of the generated power are acquired via a network, and the control unit is based on a difference between the current power generation amount and the purchase plan value. The target range is corrected, and charge / discharge of the storage battery is controlled so that the amount of power demand does not deviate from the target range.

  ADVANTAGE OF THE INVENTION According to this invention, when the solar power generation system is connected based on the whole quantity purchase system, the demand and supply of electric energy can be balanced.

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 figure which shows an example in case it is anticipated that generated electric power amount exceeds a purchase plan value. It is a figure which shows an example in case generation | occurrence | production electric power amount is anticipated to be less than a purchase plan value. It is a figure which shows an example of the target range by which prediction electric power demand was corrected. It is a figure which shows the operation | movement flow of the energy management method which concerns on one Embodiment of this invention. It is a figure which shows notionally that a specific scale electric power supplier supplies electric power to a consumer.

  Hereinafter, embodiments of the present invention will be described.

  First, an outline of an energy management system according to an embodiment of the present invention will be described. FIG. 1 is a block diagram showing a schematic configuration of an energy management system 10 according to an embodiment of the present invention. The energy management system according to the present embodiment is an energy management system for a consumer to manage energy in, for example, one store. The commercial power supply 50 in FIG. 1 represents the electric power purchased by a specific-scale electric utility 60 from a general electric utility and supplied to consumers via a transmission / distribution network managed by the general electric utility. is there.

  The energy management system 10 includes an energy management device 11, a smart meter 12, power conditioners 13 and 18, a solar power generation system 14, a storage battery 15, a distribution board 16, a load device 17, and a power sale meter 19.

  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.

  For communication of control signals and information, various methods including each layer can be adopted. For example, for communication between the energy management device 11, the smart meter 12, the power conditioners 13 and 18, and the power sale meter 19, 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 can supply electric power charged in the storage battery 15 to the load device 17 via the distribution board 16 in addition to electric power supplied from the commercial power supply 50.

  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 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 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 convert AC power supplied from the commercial power supply 50 into DC power for charging the storage battery 15.

  On the other hand, the power conditioner 18 converts the DC power generated by the solar power generation system 14 into AC power. Then, the converted AC power can be sold to the power company via the power sales meter 19. In the present embodiment, the solar power generation system 14 is connected based on a full purchase system on the assumption that all generated power is sold to the general electric utility 210 or the like. Therefore, the power generated by the solar power generation system 14 is all supplied to the commercial power supply 50 via the power sale meter 19 without being supplied to the storage battery 15 and the load device 17.

  The total purchase system is a system that can sell all the power generated by solar power, regardless of the power consumed by itself, on the premise that the total output of the installed solar panel is 10 kW or more. Therefore, the solar panels are often used for industrial purposes, such as solar panels installed by businesses, roofs of rental apartment buildings, solar panels installed on factories or school rooftops.

  The power sale meter 19 is connected to the commercial power source 50 and measures the amount of power (generated power amount) that flows backward to the commercial power source 50. And the power sale meter 19 can notify the energy management apparatus 11 of the measured electric energy.

  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 a solar panel is installed on, for example, a roof of a house and power is generated using sunlight. However, the solar power generation system 14 can adopt any system as long as it can convert the energy of sunlight 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 18 as described above, and then sold to an electric power company. Is possible.

  The storage battery 15 is under the jurisdiction of the energy management device 11 and can supply charged power to the load device 17 and the energy management device 11. The storage battery 15 can be charged with power supplied from the commercial power supply 50 or the like.

  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 11 according to one 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. In addition, the communication unit 111 acquires information regarding the power from the solar power generation system 14 that flows backward to the commercial power supply 50 from the power sale meter 19.

  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 time length that is a reference for determining an electric charge in a contract between a store managed by the energy management system 10 and the specific scale electric power company 60, and is, for example, 30 minutes. It is. 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 specific-scale electric utility 60 of data within the target range as future predicted demand power, for example, predicted demand power for 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 specific scale electric power provider 60 of the predicted demand power amount via the smart meter 12, or the specific scale electric power provider 60 via the network 70. May be notified. In addition, the specific scale electric power company 60 puts together the predicted demand electric power notified from a plurality of contracting consumers, and calculates the predicted electric power demand for the specific electric power company 60 as a whole. Notify

  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.

  In addition, the control part 112 estimates the electric power generation amount of the solar power generation system 14 connected on the assumption of the whole quantity purchase system in the said demand time limit, and calculates a difference with a purchase plan value. Then, the control unit 112 preferably corrects the target range of the predicted demand power amount based on the calculated difference. Here, the purchase plan value is a plan value of the purchased power amount for each date and each time period, which is created based on the capacity of the photovoltaic power generation system and the predicted solar radiation amount by a specific scale electric power company. The operation of the control unit 112 will be described in detail later.

  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. 6 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.

  The control unit 112 continuously monitors the power consumption after time t0, and performs control so that the charge / discharge amount of the storage battery 15 is always optimal according to the predicted power consumption at the end of the demand period. May be.

  Further, in the present embodiment, the storage battery 15 is controlled by comparing the change rate of the current power consumption amount with the average value of the change rate of the past power consumption amount, but the present invention is not limited to this configuration. The storage battery 15 may be controlled by comparing the amount of change in power consumption from the start to the present in each time period with the average value of the amount of change in past power consumption.

  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, the power consumption at the end of the demand time period decreases more than expected, and the power consumption is likely to fall below the lower limit of the target range, the control unit 112 discharges the storage battery 15. Stop.

  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.

  The control unit 112 continuously monitors the power consumption after time t0, and performs control so that the charge / discharge amount of the storage battery 15 is always optimal according to the predicted power consumption at the end of the demand period. May be.

  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 amount of power consumption at the end of the demand time period increases more than expected and the demand power amount is likely to exceed the upper limit of the target range, the control unit 112 charges the storage battery 15. Stop.

  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.

  Next, the operation | movement which corrects the target range of prediction demand electric energy based on the difference of the predicted value of electric power generation in the solar power generation system 14 and a purchase plan value is demonstrated.

  In this embodiment, when the generated electric power amount in the solar power generation system 14 is deviated from the purchase plan value, the operation is performed so as to correct the target range of the predicted demand electric energy based on the deviation amount. The specific operation will be described in detail below.

  FIG. 8 is a graph in which the horizontal axis represents time and the vertical axis represents the amount of generated power in the solar power generation system 14. The horizontal axis shows from the start to the end of a certain power generation period. Hereinafter, the time when the power generation period starts is referred to as the beginning of the power generation period, and the time when the power generation period ends is referred to as the end of the power generation period. FIG. 8 is an example when the power generation time limit is 30 minutes, for example, a graph of 30 minutes from 9:00 am to 9:30 am.

  The vertical axis represents the amount of power generated within the power generation time period, and the power generation amount at the beginning of the power generation time period is described as zero.

  The average value of the rate of change in the amount of generated power shown in FIG. 8 is obtained by averaging a straight line connecting the amount of generated power at the beginning and end of the power generation 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 generated power amount for all the time periods based on the generated power amount data for a predetermined number of days in the past.

  The control unit 112 calculates the current change rate of the generated power amount from the short-time generated power amount from the start of the power generation time period to the predetermined time t0, and predicts the generated power amount at the end of the power generation time period. In the example shown in FIG. 8, the current change rate of the generated power amount is larger than the average value of the past change rate of the generated power amount, and the predicted generated power amount is a purchase plan value based on the average value of the past generated power amount. It has exceeded. In this case, the control unit 112 upwardly corrects the target range of the predicted demand power amount. Then, the control unit 112 performs control so that the storage battery 15 is charged by that amount so that the actual power consumption amount is within the target range of the predicted demand power amount that has been corrected upward. In the example of FIG. 8, it is described that the average value of the past power generation amount is equal to the purchase plan value, but it is not always necessary to be equal, and the general electric power company is not the past generation power amount. The purchase plan value may be determined in consideration of the above circumstances.

  On the other hand, in the example shown in FIG. 9, a purchase plan in which the current change rate of the generated power amount is smaller than the average value of the change rate of the past generated power amount and the predicted generated power amount is based on the average value of the past generated power amount. Below the value. In this case, the control unit 112 corrects the target range of the predicted demand power amount downward. Then, the control unit 112 performs control so that the storage battery 15 is discharged by that amount so that the actual power consumption amount falls within the target range of the predicted demand power amount corrected downward.

  FIG. 10 shows a state after correcting the target range of the predicted demand power amount when the predicted generated power amount exceeds and falls below the purchase plan value. The control unit 112 controls charging / discharging of the storage battery 15 so that the actual demand power amount is within the target range of the predicted demand power amount after the correction.

  In this embodiment, the target range of the predicted demand power amount is corrected by comparing the change rate of the current power generation amount with the average value of the change rate of the past power generation amount. It is not limited to the configuration. The target range of the predicted demand power amount may be corrected by comparing the change amount of the generated power amount from the start to the present in each time period with the average value of the past change amount of the generated power amount.

  In the present embodiment, the solar power generation system is connected to the power system based on the total purchase system, but is not limited to this configuration. The photovoltaic power generation system may be connected to the electric power system based on another purchase system in which some restrictions are imposed on the purchase amount of generated power.

  Next, a control flow based on the energy management method according to the present embodiment will be described with reference to FIG. First, the communication unit 111 in the energy management apparatus 11 acquires information on the amount of power consumed by the load device 17 in the store or the like managed by the energy management system 10 from the smart meter 12 or the like (step S1101). And the control part 112 preserve | saves the information of the power consumption acquired by the communication part 111 in the storage medium 25 (step S1102).

  The control unit 112 calculates a target range of predicted future demand power consumption based on, for example, power consumption information for the past five days stored in step S1102 (step S1103). As described above, the target range is calculated by calculating an average value and a standard deviation from data of power consumption for a predetermined number of days in each time period and using them.

  Next, the control part 112 acquires the information regarding a purchase plan value which the general electric utility created, via the network 70 (step S1104). Moreover, the control part 112 acquires the information regarding the electric energy which the solar power generation system 14 generated from the power sale meter 19 grade | etc., (Step S1105).

  The control unit 112 predicts the amount of generated power in each time period based on the amount of generated power in the solar power generation system 14 acquired in step S1105 (step S1106). This prediction is performed, for example, on the assumption that the time change of the measurement value of the generated power amount until time t0 in FIG. 8 or FIG. 9 continues until the end of the time period.

  Next, the control unit 112 compares the predicted value of the power generation amount at the end of each time period calculated in step S1106 with the purchase plan value acquired in step S1104, and calculates the difference (step S1107). This difference value is performed, for example, by reading the difference between the predicted value of the generated power at the end of each time period in FIG. 8 and the purchase plan value.

  The control unit 112 corrects the predicted demand power amount based on the difference between the purchase plan value calculated in step S1107 and the predicted value of the generated power amount (step S1108). For example, when the current rate of change in the amount of generated power is greater than the average value of the rate of change in the amount of generated power in the past and the predicted amount of generated power exceeds the purchase plan value, the control unit 112 The target range is revised upward.

  The control unit 112 predicts the power consumption at the end of each time period based on the information on the power consumption from the start of each time period to the present time (step S1109). This prediction is performed, for example, on the assumption that the time change of the measured value of the power consumption until time t0 in FIG. 6 or 7 continues until the end of the time period.

  Then, the control unit 112 determines whether or not the predicted value of the power consumption calculated in step S1109 is within the range of the predicted demand power amount corrected in step S1108. Then, control is performed so that the storage battery 15 is charged or discharged so that the actual power consumption is within the target range of the predicted predicted power consumption (step S1110).

  By executing step S1110, the control flow based on the energy management method according to the present embodiment ends. The control unit 112 may continue this control flow at regular time intervals until the end of each time period.

  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, the specific-scale electric power supplier 60 determines the power demand of the specific-scale electric power provider 60 as a whole when the energy management apparatus 11 of each contracted consumer suppresses the variation in daily power demand in the same time zone. The variation in the amount can be suppressed, and power can be supplied from a general electric company at a low cost. In addition, when the specific-scale electric utility 60 can receive power supply from the general electric utility at a low cost, as a result, the consumer can make a contract with the specific-scale electric utility 60 under favorable conditions. Can be expected to reduce power costs. In addition, it is preferable for a general electric power company that the specific-scale electric power company 60 suppresses the variation in daily power demand 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 accurately 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. It becomes possible to grasp the electric energy with high accuracy.

  In addition, according to the present embodiment, the amount of generated power of the photovoltaic power generation system 14 connected on the assumption of the total amount purchase system is predicted, the difference from the purchase plan value is calculated, and the prediction is performed based on the calculated difference. Correct the target range of power demand. Thereby, the demand power amount can be controlled by charging / discharging of the storage battery 15 in consideration of the difference between the actual generated power amount and the purchase plan value, so that the imbalance charge can be effectively suppressed. .

  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.

DESCRIPTION OF SYMBOLS 10 Energy management system 11 Energy management apparatus 12 Smart meter 13, 18 Power conditioner 14 Photovoltaic power generation system 15 Storage battery 16 Distribution board 17 Load equipment 19 Power sale meter 25 Storage medium 50 Commercial power supply 60,220 Specific scale electric power company ( Electricity company)
70 Network 111 Communication Unit 112 Control Unit 210 General Electric Utility 230 Power Transmission / Distribution Network 240 Consumer

Claims (16)

A communication unit that obtains information on the power consumption and the amount of power generated by the solar power generation system;
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 communication unit acquires the current power generation amount of the photovoltaic power generation system connected to the power system based on the power purchase system and the purchase plan value of the generated power via the network,
The control unit corrects the target range based on a difference between the current power generation amount and the purchase plan value, and controls charging / discharging of the storage battery so that a demand power amount does not deviate from the target range. A featured energy management device.   The energy management apparatus according to claim 1, wherein the control unit calculates the target range for each predetermined time period.   3. The energy management apparatus according to claim 2, wherein the predetermined time period is a time length that is a reference for determining an electricity rate with the electric power provider.   3. The energy management apparatus according to claim 2, wherein the predetermined time period is a time length serving as a reference for a basic fee set separately from a monthly pay-as-you-go fee with the electric power company. Energy management device. In the energy management device according to any one of claims 2 to 4,
The controller is
From the power consumption amount for a predetermined number of days, calculate the rate of change of the power consumption amount or the past statistical value of the change amount for each predetermined time period,
Calculate the current rate of change or amount of power consumption from the short-term power consumption immediately after the start of each time period,
An energy management apparatus that controls the storage battery based on the current rate of change or amount of change in power consumption in each time period so as not to deviate from the target range.   6. The energy management device according to claim 5, wherein the control unit is configured such that, in each time period, the current change rate or change amount is greater than a past change rate or change amount statistical value, and a demand power amount is within the target range. An energy management device that discharges the storage battery when it is likely to exceed an upper limit.   The energy management device according to claim 5 or 6, wherein the control unit is configured such that, in each time period, the current rate of change or amount of change is smaller than a past change rate or amount of change statistical value, and the amount of power demand is the target. The energy management apparatus, wherein the storage battery is charged when it is likely to fall below a lower limit of the range.   The energy management apparatus according to any one of claims 5 to 7, wherein the control unit switches between discharging and charging in the predetermined time unit.   The energy management device according to claim 6, 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 7, wherein, as a result of charging the storage battery, the control unit stops charging the storage battery when the demand power amount is likely to exceed the upper limit of the target range. Energy management device characterized by   11. The energy management device according to claim 1, wherein the control unit uses data used in a demand controller outside the energy management device as the information on the power consumption. Energy management device. In the energy management device according to any one of claims 1 to 11,
The controller is
From the generated power amount for a predetermined number of days, calculate the rate of change of the generated power amount or the past statistical value of the change amount for each predetermined time period,
Calculate the current rate of change or amount of power generation from the amount of power generated in the short term immediately after the start of each time period,
Based on the current rate of change or amount of change in the amount of generated power in each time period, predict the amount of power generated at the end of each time period, and based on the difference between the predicted value of the generated power amount and the purchase plan value An energy management device characterized by correcting a target range.   The energy management device according to claim 12, wherein the control unit has a change rate or change amount of the current generated power amount greater than a past change rate or change amount statistical value of the generated power amount in each time period, An energy management apparatus characterized by upwardly correcting the target range when a demand power amount in each time period is likely to exceed the purchase plan value.   14. The energy management device according to claim 12 or 13, wherein the control unit has a change rate or a change amount of the current generated power amount based on a past change rate or a statistical value of the change amount in each time period. An energy management apparatus, wherein the target range is revised downward when the demanded power amount in each time period is small and is likely to fall below the purchase plan value. Obtaining power consumption information;
Based on the information on the power consumption, calculating a target range from the predicted power demand in the future to notify the power company;
Obtaining the current power generation amount of the photovoltaic power generation system connected to the power system based on the power purchase system and the purchase plan value of the generated power via the network;
Correcting the target range based on the difference between the current power generation amount and the purchase plan value;
And a step of controlling charge / discharge of the storage battery so that the amount of power demand does not deviate from the target range. 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 communication unit acquires the current power generation amount of the photovoltaic power generation system connected to the power system based on the power purchase system and the purchase plan value of the generated power via the network,
The control unit corrects the target range based on a difference between the current power generation amount and the purchase plan value, and controls charging / discharging of the storage battery so that a demand power amount does not deviate from the target range. Energy management system characterized by

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