Power management device, power system, power management method, and program

Abstract

This disclosure aims to meet user needs by visualizing the estimated total electricity costs for a specified future date on which electrical equipment will be in operation. [Solution] The present disclosure is a power management device for managing the supply of electricity stored in a facility's battery, comprising: a calculation unit 53 that calculates the total electricity sales price for each of the multiple facilities based on the remuneration unit price if each of the multiple facilities responds to the electricity supply request during the time period of future electricity supply requests to the multiple facilities, and calculates the total electricity purchase price for each of the multiple facilities based on the hourly electricity rate; and a determination unit 55 that determines which of the multiple facilities is the recipient of the electricity supply request based on the total electricity sales price and the total electricity purchase price.

Description

Technical Field

[0001] The present disclosure relates to a power management device, a power system, a power management method, and a program.

Background Art

[0002] In order to stably supply the electricity that is indispensable for our lives, it is necessary that the amount of electricity generated (supply) and the amount of electricity consumed (demand) be the same at the same time (same amount at the same time). If these amounts do not always match, the quality (frequency) of the electricity will be disrupted, and the supply of electricity cannot be carried out normally.

[0003] Therefore, in order to keep the power supply-demand balance constant, power companies perform the work of changing the amount of power generation according to the fluctuating power supply and demand moment by moment while basing on the power generation plan created in advance, and continuously matching the amount of power supplied with the demand.

[0004] However, since it is difficult to store electricity, it is difficult to store electricity in advance in preparation for a sudden increase in demand. Power companies need to produce the electricity to be used every day and supply it whenever it is needed.

[0005] Furthermore, on the supply side, there are risk factors that cause sudden fluctuations in the power supply-demand balance. For example, the supply amount of renewable energy (renewable energy) such as solar power and wind power varies depending on various conditions such as the weather. In recent years, with the expansion of the introduction of renewable energy, this fluctuation amount has a tendency to increase. When the power demand is high, the power supply-demand is tight, while when the power demand is low, the supply becomes excessive, and there may be excess electricity from renewable energy. Alternatively, it is also possible that an arbitrary power plant or transmission and distribution line suddenly fails and cannot transmit electricity, disrupting the power supply-demand balance.

[0006] Based on such a situation, the importance of DR (Demand Response) in which the demand side of energy wisely changes the consumption pattern according to the supply situation has been increasing (Patent Document 1).

[0007] Therefore, power companies, for example, if they predict that there will be a shortage of electricity to supply the entire region the following day, make requests to electricity retailers to supply the necessary electricity for the next day, thereby taking measures to maintain a stable supply of electricity.

[0008] On the other hand, by installing solar panels and storage batteries at facilities such as homes and factories, which are on the electricity demand side, it is possible to store surplus electricity that was generated but not used in the batteries or to sell it to electricity retailers by feeding it back into the power grid. In this way, the aforementioned facilities can contribute to the stable supply of electricity by power companies. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2018-170925 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] However, each facility uses more electricity stored in batteries on some days and less on others. Also, as mentioned above, the amount of renewable energy supplied fluctuates depending on various conditions such as weather, so there are days when the amount of electricity stored in batteries is small. Therefore, when a facility tries to sell the amount of electricity it has contracted with an electricity retailer, the amount of electricity stored in batteries may be insufficient, and as a result the facility may have to buy electricity from the retailer. In such a situation, if the purchase price exceeds the selling price (electricity rate), the facility will incur an economic loss, so it may be better for the facility not to comply with the retailer's request to sell electricity.

[0011] This disclosure is made in light of the circumstances described above and aims to prevent facilities capable of selling electricity from suffering economic losses. [Means for solving the problem]

[0012] This disclosure relates to a power management device for managing the supply of electricity stored in a facility's battery, comprising: a calculation unit that calculates the total electricity sales price for each of the multiple facilities based on the remuneration unit price if each of the multiple facilities responds to the electricity supply request during the time period of future electricity supply requests to the multiple facilities, and calculates the total electricity purchase price for each of the multiple facilities based on the hourly electricity rate; and a determination unit that determines which of the multiple facilities is the recipient of the electricity supply request based on the total electricity sales price and the total electricity purchase price. [Effects of the Invention]

[0013] As explained above, this disclosure has the effect of preventing facilities that can sell electricity from suffering economic losses. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of the power system. [Figure 2] This is a hardware configuration diagram of the power management device. [Figure 3] This is a functional configuration diagram of the power management system. [Figure 4] This is a conceptual diagram of the facility management table. [Figure 5] This is a conceptual diagram of the electricity bill management table. [Figure 6] This is a sequence diagram showing the processing of a power system. [Figure 7] Flowchart for calculating predicted power supply amounts [Figure 8] This is a flowchart showing the request decision-making process. [Figure 9] This is a flowchart showing the request decision-making process. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described based on the drawings. Note that the present invention is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of the present invention. Since each drawing is for conceptually explaining the present invention, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

[0016] 〔Outline of the power system〕 The outline of the power system 1 will be described using FIG. 1. FIG. 1 is a schematic diagram of the power system.

[0017] As shown in FIG. 1, the power system 1 is constructed by a power demand device 3, a power management device 5, a power generation device 6, a storage battery 7, an electric device 8, and a device control device 9.

[0018] The power demand device 3 is managed by an electric power company or an aggregation coordinator. The power management device 5 is managed by a resource aggregator. Note that the power management device 5 may be managed by an organization that also serves as an aggregation coordinator and a resource aggregator.

[0019] The power generation device 6, the storage battery 7, the electric device 8, and the device control device 9 are installed in each service station (hereinafter referred to as "SS") that has made a contract with the resource aggregator to respond to power supply requests. The power demand device 3, the power management device 5, and the device control device 9 can be connected to a communication network 100 such as the Internet. Note that the power generation device 6, the storage battery 7, and the electric device 8 are examples of devices that are controlled by the device control device 9. Also, the SS includes a charging stand. Further, the SS is an example of a facility, and facilities include factories, schools, offices (or town halls), medical institutions, houses (detached houses, condominiums, etc.), exhibition halls, stadiums, parking lots, power generation plants, locations for installing solar panels such as mountains and forests, etc.

[0020] As part of the demand response (DR), the power request device 3 requests power supply from the power management device 5 during a specified time period on a specified day (for example, from 9 a.m. to 5 p.m.). In addition, the power request device 3 requests power supply from the power management device 5 in advance the day before the day on which the power supply request will be made (see S11), and receives a response from the power management device 5 indicating whether or not they can fulfill the power supply request for the following day (see S16).

[0021] When the power management device 5 receives a power supply request for the next day from the power request device 3, it obtains the predicted power supply amount for the next day from the equipment control devices 9 of each contracted service station (see S14), sums up the obtained predicted power supply amounts, and determines whether or not it can fulfill the power supply request for the next day (see S15). The power management device 5 then responds to the power request device 3 with whether or not it can fulfill the power supply request for the next day (see S16). The power management device 5 also sends a notification to the equipment control devices 9 regarding whether or not there is a power supply request for the next day (see processing S17).

[0022] The equipment control device 9 is a device on each site side of the EMS (Energy Management System), and it communicates with the power generation device 6, the storage battery 7, and the electrical equipment 8 to acquire measurement values ​​from each and to control each of them.

[0023] Furthermore, the equipment control device 9 controls the charging and discharging of the storage battery 7. The equipment control device 9 controls the acquisition of power from the power grid EG and the supply of power to the power grid EG by reverse power flow. In addition, when the equipment control device 9 receives a request for the predicted amount of power supply for the next day from the power management device 5 (see S12), it calculates the predicted amount of power supply for the next day based on information obtained through communication with the power generation device 6, storage battery 7, and electrical equipment 8 (see S13) and transmits it to the power management device 5 (see S14).

[0024] The power generation device 6 is a device that generates electricity using renewable energy, such as a solar panel or a wind turbine.

[0025] Battery 7 refers to batteries installed in facilities such as gas stations. Battery 7 also includes EVs (Electric Vehicles). EVs include all types of electric vehicles, such as HVs (hybrid vehicles) and PHEVs (Plug-in Hybrid Electric Vehicles).

[0026] Electrical equipment 8 refers to devices that consume electricity, such as air conditioners, refrigerators, water heaters, and lighting fixtures.

[0027] [Hardware configuration] Next, the electrical hardware configuration of the power management device 5 will be explained using Figure 2. Figure 2 is an electrical hardware configuration diagram of the power management device according to this embodiment.

[0028] As shown in Figure 2, the power management device 5 includes a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a processor 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, etc., all of which are interconnected by a bus 1010.

[0029] The program that enables processing on the computer is provided, for example, on a recording medium 1001 such as a CD-ROM or memory card. When the recording medium 1001 containing the program is set in the drive device 1000, the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000. However, the program does not necessarily have to be installed from the recording medium 1001; it may also be downloaded from another computer via the communication network 100. The auxiliary storage device 1002 stores the installed program as well as necessary files and data.

[0030] When a program startup command is received, the memory device 1003 reads the program from the auxiliary storage device 1002 and stores it. The processor 1004 implements the functions related to the memory device 1003 according to the program stored in the memory device 1003. The processor 1004 may include not only a CPU (Central Processing Unit) but also a GPU (Graphics Processing Unit).

[0031] Interface device 1005 is used as an interface for connecting to a communication network, etc. Display device 1006 displays a GUI (Graphical User Interface) or the like using a program. Input device 1007 consists of a keyboard and mouse, buttons, or a touch panel, and is used to input various operation instructions. Output device 1008 outputs calculation results to an external device.

[0032] Since the power request device 3 and the equipment control device 9 have the same hardware configuration as the power management device 5, their explanation will be omitted.

[0033] [Functional Configuration of Power Systems] Next, we will explain the functional configuration of the power system using Figure 3. Figure 3 is a functional configuration diagram of the power management system. The power management system 4 includes a power management device 5 and an equipment control device 9. Note that the power management system 4 is included in the power system 1.

[0034] <Power management device> First, the functional configuration of the power management device 5 will be explained. As shown in Figure 3, the power management device 5 has a communication unit 51, a reception unit 52, a calculation unit 53, a display control unit 54, a determination unit 55, and an adjustment unit 56. Each of these units is a function or means realized by an operation instructed by the processor 1004 of the power management device 5, according to a program installed in the power management device 5.

[0035] Furthermore, the power management device 5 has a storage unit 40 which is implemented by the auxiliary storage device 1002 or memory device 1003 shown in Figure 2. The storage unit 40 contains a facility management DB (Data Base) 41 (an example of a facility management unit) and an electricity rate management DB 42 (an example of an electricity rate management unit).

[0036] Furthermore, at least one of each DB 41, 42 may be managed by an external database server or the like outside of the power management device 5. In this case, the communication unit 51 of the power management device 5 accesses the database server or the like to perform searches, etc.

[0037] (Facility Management Table) Figure 4 is a conceptual diagram of the facility management table. The facility management DB41 consists of the facility management table shown in Figure 4. The facility management table manages the names of facilities such as SS (facility names), the names of the regions where the facilities are located (region names), and facility IDs in an associated manner.

[0038] The "Region Name" indicates the name of the region where the electricity rates are the same. For example, even if facilities a1 and a2 have different addresses, if the electricity rates obtained from retailers etc. are the same, they are in the same region A.

[0039] "Facility ID" is an example of facility identification information used to identify facilities such as gas stations. This facility identification information also includes IDs used to identify the facility's operator, manager, or employees.

[0040] (Electricity bill management table) Figure 5 is a conceptual diagram of the electricity rate management table. The electricity rate management DB42 is composed of the electricity rate management table shown in Figure 5. The electricity rate management table manages electricity rates by time of day for each region. Here, electricity rates differ for daytime (10am-4pm), home time (8am-9am, 3pm-9pm), and nighttime (midnight-7am, 10pm-11pm). The electricity rate management table shown in Figure 5 may also be used to manage electricity rates by time of day for each season in each region. Note that according to the Japan Meteorological Agency's seasonal divisions, spring is March-May, summer is September-May, autumn is September-November, and winter is November-February.

[0041] (Each functional configuration) Next, let's return to Figure 3 and explain each functional configuration.

[0042] The communication unit 51 can communicate data with the power request device 3 and the equipment control device 9 via the communication network 100. The communication unit 51 can also access the storage unit 40 or an external database server, etc.

[0043] The reception unit 52 receives various operations from the operator of the power management device 5.

[0044] The calculation unit 53 calculates various values. For example, the calculation unit 53 calculates the total electricity sales price based on the remuneration unit price when responding to electricity supply requests from the electricity request device 3 during the time periods when electricity supply requests are expected for multiple facilities in the future. The calculation unit 53 also calculates the total electricity purchase price for each of the multiple facilities based on the hourly electricity rate. The processing of the calculation unit 53 will be explained in detail later.

[0045] The display control unit 54 causes the display device 1009 of the power management device 5 to display various images or characters.

[0046] The decision unit 55 performs various decisions. For example, based on the total electricity sales price and the total electricity purchase price of multiple facilities, the decision unit 55 determines which of the multiple facilities is the recipient of the electricity supply request (one or more designated facilities). In this case, the decision unit 55 can also be described as a "selection unit" that selects a designated facility from among the multiple facilities. The processing of the decision unit 55 will be explained in detail later.

[0047] The adjustment unit 56 adjusts the total predicted amount of power supply for power supply requests to match the requested amount of power supply. The processing of the adjustment unit 56 will be explained in detail later.

[0048] <Equipment Control Devices> Next, the functional configuration of the device control unit 9 will be described. As shown in Figure 3, the device control unit 9 has a communication unit 91, a reception unit 92, and a display control unit 94. Each of these units is a function or means realized by an operation instructed by the processor 1004 of the device control unit 9, according to a program installed in the device control unit 9.

[0049] Furthermore, the device control unit 9 has a storage unit 99 which is realized by the auxiliary storage device 1002 or memory device 1003 shown in Figure 3.

[0050] The communication unit 91 communicates with devices such as the power generation device 6, the storage battery 7, and the electrical equipment 8, and receives data of actual values ​​such as power generation amount, storage amount, remaining storage amount, and power consumption from these devices. The communication unit 91 also communicates with the power management device 5 via the communication network 100.

[0051] The reception unit 92 receives various operations for the equipment control device 9 from the operator of the equipment control device 9.

[0052] The calculation unit 93 calculates the predicted amount of power to be transmitted to the power management device 5, based at least on the current remaining power in the battery 7 and the predicted amount of power to be stored in the battery 7 from the present until the start of the power supply request the following day. The processing of the calculation unit 93 will be explained in detail later.

[0053] The display control unit 94 causes the display device 1009 of the device control device 9 to display various images or characters.

[0054] [Processing in the embodiment] Next, the processing of the embodiment will be explained using Figures 6 to 9. In the following explanation, an SS (Service Station) will be used as an example of a facility.

[0055] S11: The power request device 3 transmits a power supply request for the following day to the power management device 5. This request, issued the day before the designated day, indicates whether or not the power supply request for the following day (designated day) can be fulfilled. The request also includes information indicating the time period for the power supply request (for example, from 11:00 AM to 12:00 PM), the amount of power requested, and reward information. The reward information includes the hourly selling price of electricity that each service station (SS) will sell to the power company via a retailer if they comply with the request. As a result, the communication unit 51 of the power management device 5 receives the power supply request for the following day.

[0056] S12: The communication unit 51 of the power management device 5 transmits a request for the predicted amount of power to be supplied the following day to the equipment control devices 9 of each service station (SS) that has a contract to receive power supply requests. This request includes information indicating the time period of the power supply request, which the communication unit 51 received in processing S11. As a result, the communication unit 91 of the equipment control device 9 receives the request for the predicted amount of power to be supplied the following day. Note that if the power management device 5 manages the supply of power stored in the batteries of 100 service stations, it may have contracts to receive power supply requests from all 100 service stations, or it may have contracts to receive power supply requests from only a portion of the service stations (for example, 80 stations).

[0057] S13: The equipment control device 9 calculates the predicted amount of power supply that its facility can provide the following day.

[0058] Here, we will explain in detail the calculation process for the predicted power supply using Figure 7. Figure 7 is a flowchart of the power supply prediction process.

[0059] <Calculation process for predicted power supply amount> S31: Communications Unit 91 obtains sunshine duration information (weather forecast information) from the Japan Meteorological Agency and other sources, showing the hourly sunshine duration for today and the following day.

[0060] S32: The calculation unit 93 calculates the predicted amount of electricity generated by sunlight for today (from this point in time onward) and tomorrow, based on the maximum output of the power generation device 6 and the hourly sunshine duration.

[0061] S33: The calculation unit 53 calculates the predicted power supply amount e1 when responding to the power supply request for the following day using the following equations (Equation 1) to (Equation 3). Note that "the following day" in the power supply request for the following day and the predicted power supply amount for the following day is an example of "the future". For example, in process S33, sunshine duration is required, so "the future" includes up to about two weeks ahead, when sunshine duration (weather forecast) can be obtained.

[0062] e1 (predicted power supply amount for the next day) = e2 (current remaining charge in the battery) + e3 (predicted amount of charge to be stored in the battery from the present until the start of the power supply request for the next day) - e4 (amount of power secured in the battery) ... (Equation 1) Note that "the present time" refers to a specific point in time before the time period for requesting electricity supply.

[0063] e3 (predicted storage amount) = e31 (surplus electricity stored (charged) in the battery based on power generation from the present time until the start of the next day's power supply request) + e32 (predicted amount of electricity supplied from the power grid EG from the present time until the start of the next day's power supply request (predicted amount of electricity purchased)) - e33 (amount of electricity used from the battery from the present time until the start of the next day's power supply request (predicted amount of discharge)) ... (Equation 2) e31 (surplus power) = e311 (predicted amount of solar power generation from the present time until the start of the next day's power supply request) - e312 (total predicted amount of power consumption of all electrical equipment 8 in SS) ... (Equation 3) Note that e2 (remaining charge) is a value managed by the communication unit 91 to track the amount of charge remaining in the battery 7. e4 (remaining power) may be omitted. In other words, at least e2 (remaining power) and e3 (predicted charge) should be used.

[0064] Furthermore, e32 (predicted purchase amount) is the amount of electricity needed to fully charge the battery 7 by being supplied from the power grid EG during the night, for example. e33 (predicted discharge amount) is the amount of electricity that is discharged from the battery 7 during the day and used for electrical equipment 8, for example. e32 (predicted purchase amount) and e33 (predicted discharge amount) are stored in the memory unit 99 as seasonal values. e311 (power generation forecast) is calculated based on the sunshine duration information obtained in processing S31. e312 (total predicted power consumption) is stored in the memory unit 99 as a seasonal value, and when the calculation unit 53 calculates using (Equation 3), it reads out the total predicted power consumption corresponding to the current season.

[0065] This concludes the explanation of process S13. Next, we will return to Figure 6 and continue the explanation.

[0066] S14: The communication unit 91 transmits to the power management device 5 the predicted amount of power supply that can be supplied during the power supply request period the following day, which was calculated by processing S13. This predicted amount of power supply for the following day includes a facility ID to identify the SS that is the source of the transmission. As a result, the communication unit 51 of the power management device 5 receives the predicted amount of power supply that can be supplied during the power supply request period the following day and can identify the SS that is the source of the transmission by the facility ID.

[0067] S15: The power management device 5 performs a request determination process to decide whether or not to respond to the request in process S11, based on the predicted amount of power supply for the following day received from each SS.

[0068] <Request Decision Processing> Here, we will explain the request decision process using Figures 8 and 9. Figure 8 is a flowchart of the request decision process.

[0069] S51: The calculation unit 53 calculates the total electricity sales price (electricity sales amount) when selling electricity from the gas station during the electricity supply request period (activation period) based on the reward information (reward unit price) received in processing S11. The reward unit price varies from day to day, but for example, if the reward unit price per kWh is 40 yen, and the electricity supply request period (activation period) is 2 hours from 11 am to 12 pm, and 9 kW stored in the battery is supplied to the grid, the total electricity sales price will be 720 yen (= 40 yen × 2 hours × 9 kWh). Furthermore, since the compensation rate is the same for all gas stations (SS), the electricity selling price is also the same. However, as shown in Figure 5, the unit price of electricity charges (purchase price) for gas stations varies depending on the region and time of day, so calculations like those in process S53 described later are performed.

[0070] S52: The calculation unit 53 searches the facility management DB 41 based on the facility ID received in processing S14, and reads the name of the region to which the SS belongs that corresponds to the facility ID.

[0071] S53: The calculation unit 53 reads the hourly electricity rates (purchase prices) for the time period when electricity supply is requested in each region from the electricity rate management DB 42, and calculates the total purchase price (electricity purchase price) for each gas station during the time period when electricity supply is requested based on these read electricity rates. For example, if the time period when electricity supply is requested is the two hours from "11:00 AM to 12:00 PM" as shown in Figure 5, the total purchase price for each gas station in each region will be as follows. SS in Area A (Facility ID: a101): 648 yen (= 36 yen x 2 hours x 9 kWh) SS in Area A (Facility ID: a201): 504 yen (= 36 yen x 2 hours x 7 kWh) SS in Area B (Facility ID: b101): 727 yen (= 44 yen x 2 hours x 9 kWh) SS in area C (Facility ID: c101): 756 yen (= 42 yen x 2 hours x 9 kWh) In processing S51, the calculation unit 53 may subtract the fees of resource aggregators, etc. (for example, 10% of the fee unit) from the reward information (reward unit price) when calculating the total electricity sales price (electricity sales amount). Alternatively, in processing S53, the calculation unit 53 may include the fees of resource aggregators, etc. (for example, 10% of the electricity purchase price) in the total electricity purchase price when finally calculating the total electricity purchase price. S54: Next, the determination unit 55 identifies a predetermined SS that has transmitted the predicted amount of electricity supply for the next day in processing S14 but has not performed a comparison of the total electricity selling price and the total electricity buying price.

[0072] S55: The determination unit 55 determines whether the total electricity sales price is equal to or greater than the total electricity purchase price for the predetermined SS identified in process S54. For example, in the above example, in regions A and B, the total electricity sales price is equal to or greater than the total electricity purchase price, resulting in an economic (monetary) benefit, but in region C, the total electricity sales price is less than the total electricity purchase price, resulting in an economic (monetary) loss. This determination result depends on three factors: the remuneration unit price, the region (unit price of electricity per hour), and the time of day when the electricity supply request is made.

[0073] S56: In process S55, if the total electricity sales price is equal to or greater than the total electricity purchase price (YES), a profit is generated. Therefore, the determination unit 55 determines that the predetermined SS, which is the subject of the determination in process S55, is the destination for the electricity supply request, and allocates the predicted amount of electricity to be supplied the following day, which has been sent from this predetermined SS by process S14, to the amount of electricity to be supplied. In other words, for example, the predicted amount of electricity to be supplied the following day, which has been sent from SS in areas A and B, is allocated to the amount of electricity to be supplied.

[0074] S57: In process S55, if the total electricity sales price is not equal to (or less than) the total electricity purchase price (NO), a loss will occur. Therefore, the determination unit 55 decides not to use the predetermined SS that is the subject of the determination in process S55 as the destination for the electricity supply request, and does not allocate the predicted amount of electricity to be supplied the following day, which was sent from this predetermined SS in process S14, to the amount of electricity for the electricity supply request. For example, the predicted amount of electricity to be supplied the following day, which was sent from the SS in region C, is not allocated to the amount of electricity for the electricity supply request.

[0075] S58: After processing S56 or S57, the determination unit 55 determines, for all SSs, whether the comparison of the total electricity selling price with the total electricity buying price has been completed for all SSs by processing S55. If processing S55 has not been completed for all SSs, the process returns to S54.

[0076] S59: On the other hand, in process S58, if process S54 has been completed for all SS, the calculation unit 53 calculates the total predicted power supply amount (total power amount) for power supply requests by summing up the predicted power supply amounts for each power supply request assigned by process S56.

[0077] S60: The determination unit 55 determines whether or not to respond to the power supply request based on whether the total predicted amount of power supply calculated in process S59 is equal to or greater than the requested amount for power supply received in process S11.

[0078] S61: In process S60, if the total predicted amount of power supply is greater than or equal to the requested amount (YES), the determination unit 55 determines to respond to the power supply request for the next day made in process S11.

[0079] S62: The adjustment unit 56 adjusts the total predicted amount of power supply for power supply requests to match the requested amount of power supply. For example, if the requested amount is 8000kWh and the total predicted amount of power supply is 10000kWh, and the total predicted amount of power supply exceeds the requested amount, the adjustment unit 56 adjusts the total predicted amount of power supply according to the requested amount by any of the following methods (1) to (3). (1) The adjustment unit 56 adjusts the total predicted power supply amount to the requested amount (e.g., 8000 kWh) by setting each predicted power supply amount assigned in processing S56 to a predetermined percentage (in this case, 80%). Note that the total predicted power supply amount may exceed the requested amount (e.g., 8000 kWh) by a predetermined amount of power (e.g., 100 kWh). (2) The adjustment unit 56 sorts each power supply forecast amount assigned in processing S56 in descending order of the profit from fees paid by resource aggregators, etc., and adopts them in descending order of profit, so that the last power supply forecast amount adopted equals the requested amount (e.g., 8000 kWh). The last power supply forecast amount may exceed the requested amount by a predetermined amount of power (e.g., 100 kWh). Also, the last multiple (e.g., three) power supply forecast amounts may exceed the requested amount by a predetermined amount of power (e.g., 100 kWh). (3) The adjustment unit 56 sorts each predicted power supply amount assigned in process S56 in descending order of the predicted power supply amounts received in process S14, and adopts them in descending order of power supply amount, thereby adjusting so that the last predicted power supply amount adopted exceeds the requested amount (8000 kWh). Note that the last predicted power supply amount may exceed the requested amount by a predetermined amount of power (e.g., 100 kWh). Also, the last multiple (e.g., three) predicted power supply amounts may exceed the requested amount by a predetermined amount of power (e.g., 100 kWh).

[0080] Furthermore, if the total amount of power is equal to the requested amount, the adjustment unit 56 will either not perform any adjustment, or if it does perform an adjustment, it will set each predicted power supply amount allocated in process S56 to 100%.

[0081] S63: On the other hand, in process S60, if the total predicted amount of power supply is less than the requested amount (NO), the determination unit 55 determines that it will not respond to the power supply request in process S11.

[0082] This concludes the explanation of process S15. Next, we will return to Figure 6 and continue the explanation.

[0083] S16: The communication unit 51 transmits to the power request device 3 the response to the power supply request for the following day, which was determined in process S15. This response indicates that the power supply request will be fulfilled if it is determined in process S61 to do so, and indicates that the power supply request will not be fulfilled if it is determined in process S63 to not do so.

[0084] S17: Furthermore, the communication unit 51 sends a notification to the equipment control devices 9 of each SS that are the source of process S14, indicating to the source (equipment control device 9) of the predicted power supply amount assigned by process S56 that it plans to request power supply the following day, and to the source (equipment control device 9) of the predicted power supply amount that was not assigned by process S57 that it plans not to request power supply the following day. The notification indicating that it plans to request power supply the following day includes a value representing at least a portion of the predicted power supply amount after adjustment by process S62, i.e., the predicted power supply amount for the following day received in process S14. If adjustment by process S62 is not performed, the predicted power supply amount for the following day received in process S14 does not need to be included in the notification indicating that there will be a power supply request the following day.

[0085] [Main effects of the embodiment] As explained above, according to this embodiment, the determination made by the determination unit 55 in process S55 has the effect of ensuring that facilities that are eligible to sell electricity do not suffer economic losses.

[0086] 〔supplement〕 Although embodiments have been described above, the present invention is not limited in any way to the embodiments described above, and various modifications and substitutions can be made without departing from the spirit of the present invention.

[0087] (1) Each of the above programs can be recorded on a (non-temporary) recording medium and distributed, and can also be provided via a communication network such as the Internet.

[0088] (2) The CPU 1004 as a processor may be a single unit or multiple units. [Explanation of Symbols]

[0089] 1. Power Systems 3. Power Request Device 4. Power Management System 5 Power management device 6. Power generation equipment 7. Storage Battery 8. Electrical appliances 9. Equipment control device 40 Storage section 41. Facility Management Database (An example from the Facility Management Department) 42. Electricity Bill Management Database (An example of an electricity bill management department) 51. Communication section (Example of a transmitting section, example of a receiving section) 52 Reception Department 53 Calculation Unit 54 Display Control Unit 55. Judgment Unit (Selection Unit) 56 Adjustment section 91. Communication Unit (Example of Prediction Amount Transmission Unit, Example of Request Reception Unit, Example of Notification Reception Unit) 92 Reception Department 93 Calculation Unit (An example of a predictive quantity calculation unit) 94 Display Control Unit 99 Memory section

Claims

1. A power management device that manages the supply of electricity stored in the facility's battery, A calculation unit that calculates the total electricity sales price for each of the multiple facilities based on the remuneration rate if each of the multiple facilities responds to the electricity supply request during the time period in which future electricity supply requests are made to multiple facilities, and calculates the total electricity purchase price for each of the multiple facilities based on the hourly electricity rate, A determination unit that determines, based on the total electricity selling price and the total electricity buying price, which of the multiple facilities is the designated facility to which the electricity supply request is made, A power management device having the following features.

2. The power management device according to claim 1, wherein the calculation unit calculates the total electricity purchase price using the hourly electricity rates for the region to which each of the multiple facilities belongs.

3. The power management device according to claim 1, wherein the determination unit determines that a facility whose total electricity sales price is equal to or greater than the total electricity purchase price is one of the predetermined facilities.

4. Each of the aforementioned multiple facilities has a receiving unit that receives each predicted amount of power supply that can be supplied during the time period of the power supply request from each equipment control device that controls the storage battery, The calculation unit calculates the total predicted power supply amount by summing up each of the predicted power supply amounts, The determination unit determines whether or not to respond to the power supply request based on the predicted total amount of power supply and the requested amount of power supply. The power management device according to claim 1.

5. The power management device according to claim 4, wherein the determination unit determines to respond to the power supply request if the total predicted amount of power supply is equal to or greater than the requested amount.

6. A power management device according to claim 4, A power management device having an adjustment unit that adjusts the total predicted power supply amount according to the requested amount if the predicted total power supply amount exceeds the requested amount.

7. The power management device according to claim 6, wherein the adjustment unit adjusts the total predicted power supply amount to the requested amount by uniformly setting each predicted power supply amount to a predetermined ratio, or adjusts the requested amount to exceed a predetermined amount of power.

8. The power management device according to claim 6, wherein the adjustment unit adjusts the total predicted power supply amount by selecting each predicted power supply amount in order of the profit from fees.

9. The power management device according to claim 6, wherein the adjustment unit adjusts the total predicted power supply amount by selecting each predicted power supply amount in descending order of the predicted power supply amounts.

10. A power management device according to claim 5, A power management device having a transmitting unit that transmits a notification to the equipment control device of the predetermined facility indicating that it plans to request power supply for at least a portion of the predicted amount of power supply received from the equipment control device of the predetermined facility in the future.

11. The power management device according to claim 4, wherein the determination unit determines that it will not respond to the power supply request if the total predicted amount of power supply is less than the requested amount.

12. A power management device according to claim 4, The receiving unit receives future power supply requests from the power supply request device that initiates the power supply request, A power management device having a transmitting unit that, when the determination unit determines to respond to the power supply request, transmits a response to the power supply request device indicating that it will respond to future power supply requests.

13. A power management device according to any one of claims 4 to 12, Each of the aforementioned device control devices, A power management system having

14. Each of the aforementioned device control devices is: A prediction amount calculation unit that calculates the predicted power supply amount based on at least the remaining power in the battery at a predetermined time before the time period of the power supply request, and the predicted amount of power stored in the battery from the predetermined time until the start of the power supply request, A prediction amount transmission unit that transmits the calculated predicted power supply amount to the power management device, The power management system according to claim 13, having the following features.

15. A power management method performed by a power management device that manages the supply of power stored in a facility's battery, A calculation process that calculates the total electricity sales price for each of the multiple facilities based on the remuneration rate per facility if each of the multiple facilities responds to the electricity supply request during the time period in which future electricity supply requests are made to multiple facilities, and calculates the total electricity purchase price for each of the multiple facilities based on the hourly electricity rate per facility, Based on the total electricity selling price and the total electricity buying price, a determination process is performed to determine which of the multiple facilities is the designated facility to which the electricity supply request is made. A power management method that implements this.

16. A program that causes a computer to perform the method described in claim 15.

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