Power supply system and program

Abstract

To provide a power supply system supplying power to a complex facility including a plurality of power providing destinations, and a program, by which a storage battery installed in a private section by a tenant is cooperated together to be efficiently utilized.SOLUTION: In a power supply system, a management device 2 includes: a power rate calculation section 201 for calculating a power rate to invoice a tenant, from power consumption information; a return rate calculation section 202 for calculating a return rate to be returned to the tenant who has supplied power from a storage battery pertaining to a possession of the tenant to other private sections and a common section; and a purchasing power rate calculation section 203 for calculating a purchasing power rate to be paid to a power provider, based on a purchasing power amount, or for storing an invoicing amount of the purchasing power rate from the power provider.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electric power supply system and a program for supplying electric power to a complex facility including a plurality of electric power supply destinations. [Background technology]

[0002] In recent years, power supply systems equipped with distributed power sources such as storage batteries and solar cells and connected to the power grid have become widespread. Among these, a power supply system that supplies power to a complex facility including a plurality of power supply destinations (hereinafter also referred to as occupants) and that realizes a reduction in electricity charges when receiving power collectively is known (e.g., Patent Document 1). In addition, in such a system, it is also known to calculate the electricity charges to be charged to each occupant and the return charge to the owner of the complex facility (e.g., Patent Document 2).

[0003] With this type of power supply system, it is possible to set low electricity rates for each resident and also provide a rebate to the owner of the complex, making it possible for both the resident and the owner of the complex to enjoy the benefits of self-generation (or power supply) using distributed power sources. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-17779 A [Patent Document 2] JP 2020-198696 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned complex, it is conceivable that individual residents may install storage batteries for use in their own private areas. In this case, although the total capacity of the storage batteries installed in the complex increases, the storage batteries installed by the individual residents are only for personal use and cannot be used in conjunction with the power supply system of the complex, which receives power in bulk.

[0006] However, if the capacity of individually installed batteries can be used in conjunction with the power supply system of a complex, the battery capacity in the system will increase from the perspective of the bulk power receiving business (i.e., the owner of the complex), and by making effective use of this, it will be possible to control the power supply more efficiently.

[0007] On the other hand, for residents who have installed their own storage batteries, if they are able to use their own storage batteries (and their capacity) for their own purposes and sell any surplus power capacity to the system, they can make full use of the storage battery capacity without waste.

[0008] The present invention has been made in consideration of the above-described situation, and provides a technology that enables storage batteries installed in private areas by tenants to be linked to the power supply system and effectively utilized in a power supply system that supplies power to a complex facility including multiple power supply destinations. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention employs the following configuration: That is, a power supply system for a complex facility including a plurality of power supply destinations, A distributed power source capable of supplying power to the plurality of power supply destinations; One or more first storage batteries individually provided in at least one of the power supply destinations; a power distribution device connected to a power grid, the distributed power sources, and each of the plurality of power supply destinations so as to be able to transmit and receive power; a first power value acquiring means for acquiring a value of power exchanged between the power distribution device and the power grid; a second power value acquiring unit that acquires a value of power exchanged between the power distribution device and each of the plurality of power supply destinations; a third power value acquisition means for acquiring a value of power exchanged between the power distribution device and the distributed power sources; a power control means for controlling the exchange of power between the power distribution device and each of the power supply destinations, the exchange of power with the power grid, the exchange of power with the distributed power sources, and the power related to the generation and / or charging / discharging of the distributed power sources; a fee management means for calculating an electricity fee to be charged to each of the plurality of power supply destinations and a rebate fee for the power supply destination that includes the first storage battery, based on the power values ​​acquired by the power value acquisition means; The power supply system is characterized by comprising:

[0010] Here, the "power supply destination" includes the so-called private areas of the occupants in a complex, as well as the common areas of the facility. Examples of "distributed power sources" include power generation facilities using renewable energy such as solar power generation and wind power generation, fuel cells, and storage batteries. "Acquiring a power value" also includes calculating a power value based on specified data, in addition to directly measuring power using a power meter. For example, calculating a power value at a specified location based on a measurement value obtained from a power meter installed at another location in the system also falls under the term "acquiring a power value" here.

[0011] With this system, even if a resident individually installs a storage battery in his / her private area, the battery installed in the private area can supply power to other power supply destinations (i.e., the private areas of other resident and the common areas of the facility) via a power distribution device. The amount of power supplied from the storage battery installed in the resident's private area to other power supply destinations is measured and a rebate fee is calculated based on the amount of power supplied, so the resident who personally installed the storage battery can earn the rebate fee as revenue. Meanwhile, the owner of the complex (bulk power receiving business operator) can increase the total capacity of the storage batteries managed by the system without any burden on his / her own.

[0012] The distributed power source may include a power generation facility and a second storage battery that are shared by the facility. This makes it possible to supply electricity generated by, for example, solar power generation to each resident at a low price, charge the second storage battery when the amount of electricity generated is greater than the demand for electricity, and supply electricity from the second storage battery to the resident when the demand for electricity is greater than the amount of electricity generated.

[0013] The fee management means may calculate the electricity fee based on the power values ​​acquired by the power value acquisition means, a first power unit price which is a unit price of power supplied from the power grid to the power supply destination, a second power unit price which is a unit price of power supplied from the power generation facility to the power supply destination, a third power unit price which is a unit price of power supplied from the second storage battery to the power supply destination, and a fourth power unit price which is a unit price of power supplied from the power supply destination having the first storage battery to another power supply destination. More specifically, the electricity fee may be calculated by multiplying the amount of power obtained by integrating the acquired power values ​​for a predetermined period by each of the power unit prices.

[0014] According to this, power supplied to the power supply destination from the power grid, power supplied to the power supply destination from the distributed power source, and power supplied to the power supply destination having the first storage battery By providing a difference in the unit price of electricity between the power supplied to the other power supply destinations, it is possible to calculate an electricity rate that allows both the bulk power receiving business operator and the occupants to enjoy profits without incurring any losses. Note that any or all of the first to fourth unit prices of electricity may be the same price.

[0015] The second electricity unit price may be set to be cheaper than the first electricity unit price, whereby a resident who personally owns a storage battery can charge the storage battery with cheaper electricity and discharge the charged electricity for the load in his / her private area, thereby reducing costs compared to using electricity supplied from a power grid.

[0016] The fee management means may calculate the rebate fee based on a fifth electricity price, which is a preset purchase price of electricity supplied from a power supply destination having the first storage battery to the other power supply destinations, and the amount of electricity supplied from the power supply destination having the first storage battery to the other power supply destinations that is the subject of the rebate fee calculation. The fourth electricity price may be set to be equal to or higher than the fifth electricity price and equal to or lower than the first electricity price. In this way, it is possible to calculate a rebate fee and an electricity price that allow all of the resident who owns the storage battery, the resident who does not own a storage battery, and the lump-sum electricity receiving business operator to enjoy profits without suffering any losses.

[0017] The second electricity unit price may be set to be lower than the fifth electricity unit price. With this, a resident who personally owns a storage battery can charge the storage battery with the generated low-cost electricity and supply electricity to other power supply destinations at a unit price higher than the purchase price of the electricity related to the charging, and can make a profit from the difference in price.

[0018] The fee management means may calculate the electricity fee for each of the power supply destinations by using a fee calculation amount of power calculated based on a ratio of the amount of power supplied to the power supply destination that is the subject of the electricity fee calculation to the total amount of power supplied to all the power supply destinations in the complex for which the electricity fee is charged. In this way, the electricity related to the common areas of the complex can be pro rata based on the electricity consumption ratio of each resident and charged to the resident.

[0019] In addition, for each of the first storage batteries, an external supply stop remaining amount, which is a lower threshold of remaining capacity at which the power supply to the other power supply destinations should be stopped, is set in advance, and the power control means may be configured to control the stopping of power supply from the power supply destination that has the first storage battery to the other power supply destinations when the remaining capacity of the first storage battery becomes equal to or less than the external supply stop remaining amount.

[0020] According to this, for example, for a privately owned storage battery, the owner of the storage battery can secure any remaining capacity determined by the owner of the storage battery, while supplying the surplus to other power supply destinations, thereby making it possible to obtain benefits from this. In other words, since the owner of a privately owned storage battery can freely secure and use the power of the storage battery at his or her own discretion, it is possible to prevent disadvantages from occurring by linking the privately owned storage battery to the power supply system.

[0021] In addition, for each of the first storage batteries, an external supply limit power amount, which is an upper threshold value of the amount of power permitted to be supplied to the other power supply destinations within a specified period, is set in advance, and the power control means may be configured to control the stopping of power supply from the power supply destination having the first storage battery to the other power supply destinations when the amount of power supplied from the first storage battery to the other power supply destinations within a specified period is equal to or less than the external supply limit power amount.

[0022] According to this, it is possible to control a privately owned storage battery so that the owner of the storage battery can supply an arbitrary amount of power to other power supply destinations. Since the owner of a battery can freely decide at his or her own discretion how much electricity to supply to other power destinations, there is no disadvantage to linking a privately owned storage battery to the power supply system.

[0023] In addition, for each of the first storage batteries, a power supply permission time, which is a time period during which power supply to the other power supply destinations is permitted, is set in advance, and the power control means may control the supply of power from the power supply destination having the first storage battery to the other power supply destinations only within the power supply permission time.

[0024] According to this, a privately owned storage battery can be controlled to supply power to other power supply destinations only during a time period determined by the owner of the storage battery. In other words, the owner of a privately owned storage battery can determine the time period during which the battery supplies power to other power supply destinations at his or her own discretion, so that there is no disadvantage caused by linking a privately owned storage battery to a power supply system.

[0025] The second power value acquisition means may include an individual power storage power value acquisition means for acquiring only the value of the power exchanged with the first storage battery. Such a power value acquisition means makes it possible to more accurately measure the amount of power exchanged with the first storage battery.

[0026] The first storage battery and / or the distributed power source may include a storage battery mounted on an electric vehicle, thereby forming a system that introduces so-called V2H (Vehicle to Home).

[0027] The present invention can also be understood as a program for causing a computer to function as the above-mentioned power control means and / or fee management means, or as a computer-readable recording medium on which such a program is non-transiently recorded.

[0028] The present invention can be achieved by combining the above-described configurations and processes as long as no technical contradiction occurs. Effect of the Invention

[0029] According to the present invention, in a power supply system that supplies power to a complex facility including multiple power supply destinations, it is possible to provide a technology that enables storage batteries installed in private areas by tenants to be linked to the power supply system and effectively utilized. [Brief description of the drawings]

[0030] [Figure 1]FIG. 1 is a block diagram showing a schematic configuration of a power supply system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram of a functional configuration of the management device according to the first embodiment. [Diagram 3] FIG. 3 is a first flowchart illustrating an example of a power control process performed by the battery controller according to the first embodiment. [Figure 4] FIG. 4 is a second flowchart illustrating an example of the power control process performed by the battery controller according to the first embodiment. [Diagram 5] FIG. 5 is a diagram illustrating an example of power control for one day by the power supply system according to the first embodiment. [Figure 6] FIG. 6 is a third flowchart illustrating an example of a power control process performed by the battery controller according to the first embodiment. [Figure 7] FIG. 7 is a flowchart illustrating a process flow according to a modification of the first embodiment. [Figure 8] FIG. 8 is a flowchart illustrating a process flow according to another modified example of the first embodiment. [Figure 9] FIG. 9 is a block diagram illustrating a schematic configuration of a power supply system according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] <Application Examples> Hereinafter, application examples of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of a power supply system 1 to which the present invention can be applied. In FIG. 1, solid lines connecting each block indicate power lines, and dashed lines connecting each block indicate communication lines (including wireless communication). It is assumed that the power supply system 1 according to this application example is applied to an apartment building 1a. In this case, the apartment building 1a is an example of a complex facility including multiple power supply destinations. It is also assumed that the system is equipped with distributed power sources such as solar cells, wind power generators, so-called V2H (Vehicle to Home) power sources, and storage batteries.

[0032] In FIG. 1, the power supply system 1 is electrically connected to the power grid 3. When the power supply by the distributed power source is less than the power consumption at the multiple power supply destinations and there is a power shortage, it is possible to purchase power from the power grid 3, for example. When the power supply by the distributed power source is more than the power consumption at the multiple power supply destinations, it is possible to sell the surplus power to the power grid 3, for example. The power exchanged with these power grids 3 is measured by a parent smart meter 4. The power grid 3 may be a so-called retail electricity supplier or a general electricity supplier. The power grid 3 to which the power is purchased and the power grid 3 to which the surplus power is sold may be different electricity suppliers or may be the same electricity supplier. The parent smart meter 4 may also be configured to have a smart meter for purchasing power and a smart meter for selling surplus power separately provided.

[0033] Moreover, the power supply system 1 has a management device 2 configured to be able to communicate with the system in the apartment house 1a outside the apartment house 1a. In this application example, the system in the apartment house 1a and the management device 2 are able to communicate wirelessly via an LTE router 6. More specifically, the management device 2 may be a server device provided on the cloud by a management company that is the operating entity of the power supply system 1. However, the management device 2 may be connected by wired communication and may not necessarily be provided on the cloud as long as it is able to transmit and receive information between the system in the apartment house 1a in the power supply system 1. Note that the management device 2 has a function of calculating the electricity fee to be charged to each power supply destination and the refund fee to be refunded from the power used in the apartment house 1a, as described below.

[0034] In addition, the multiple power supply destinations of the power supply system 1 are assumed to be private units 120a, 120b, 120c, etc. The private units 120a, 120b, 120c, etc. are, for example, each room (hereinafter, also referred to as a resident) in the apartment building 1a. In addition, the loads 12a, 12b, 12c, etc. in the private units 120a, 120b, 120c, etc. are electrical appliances and the like in each room in the apartment building 1a.

[0035] As shown in Fig. 1, the exclusive use area 120a is provided with a storage battery 121a and a storage battery power conditioner 122a. In this way, each resident can independently install power storage equipment in his / her own exclusive use area.

[0036] In addition to the private areas 120a, 120b, 120c, etc., the apartment building 1a also has a common area 13. The common area 13 is a common portion of the apartment building 1a, and the loads of the common area 13 may be, for example, lights 13a in the hallway or entrance, and a specific load distribution board 13b that can automatically supply power to pre-connected electrical appliances during a power outage. The private areas 120a, 120b, 120c, etc. and the common area 13 are equipped with smart meters 11a, 11b, 11c..., 18 are provided, and it is possible to measure the power supplied to the exclusive use areas 120a, 120b, 120c... and the common area 13.

[0037] Here, the smart meters 11a, 11b, 11c... provided for the exclusive units 120a, 120b, 120c... are configured to be able to measure not only the power supplied from the first distribution board 9 to the exclusive units 120a, 120b, 120c..., but also the power transmitted from the exclusive units 120a, 120b, 120c... to the first distribution board 9. This makes it possible for a resident of the exclusive unit 120a to use his or her own installed storage battery 121a (storage battery power conditioner 122a) in conjunction with the power supply system 1.

[0038] The power supply system 1 is also provided with a storage battery 14 and a solar cell 15 as distributed power sources. The storage battery 14 is connected to a storage battery power conditioner 16 including a bidirectional DC / DC converter for raising and lowering the charge / discharge voltage, and a DC / AC converter for converting the voltage related to the charge / discharge of the storage battery into DC / AC. The power output from the storage battery power conditioner 16 is measured by a smart meter 19a. On the other hand, the solar cell 15 is connected to a solar cell power conditioner 17 including a DC / DC converter for adjusting the power generation voltage of the solar cell 15, a control circuit for performing MPPT control using a hill-climbing method, and a DC / AC converter for converting the output voltage of the solar cell 15 into DC / AC. The power output from the solar cell power conditioner 17 is measured by a smart meter 19a. The solar cell power conditioner 17 is also electrically connected to the storage battery power conditioner 16, and the power generated by the solar cell 15 can be directly charged to the storage battery 14. In this embodiment, a distributed power source in which the storage battery 14 and the solar cell 15 are integrated may be used.

[0039] Then, the management device 2 calculates the electricity fee to be charged to each resident based on the amount of power measured by the master smart meter 4 and the smart meters 11a, 11b, 11c, . . . , 18, 19a, and 19b. Furthermore, in the power supply system 1 according to the present application, when a resident who has his / her own storage battery, such as the resident of the exclusive unit 120a equipped with the storage battery 121a, supplies the power stored in the storage battery to the other exclusive units 120b, 120c, . . . or the common unit 13, the amount of power supplied can be measured by the smart meter 11a. Therefore, when power is supplied from the resident of the exclusive unit 120a (specifically, the storage battery 121a), it is also possible to calculate the fee to be returned to the resident.

[0040] In this way, according to the power supply system 1 of this application example, in a power supply system that supplies power to a complex facility including multiple power supply destinations, it is possible to effectively utilize the storage batteries installed in the private areas by linking them to the power supply system.

[0041] <Example 1> In the following, an embodiment of the invention will be explained in more detail with reference to the drawings.

[0042] In the power supply system 1 shown in FIG. 1, the storage battery power conditioner 16 and the solar cell power conditioner 17 are connected to a second distribution board 10 for distributed power sources. The second distribution board 10 is connected to a first distribution board 9 that distributes power to each of the exclusive units 120a, 120b, 120c, and the common unit 13. The first distribution board 9 is connected to the power system 3 via the parent smart meter 4. The first distribution board 9 is also connected to each of the exclusive units 120a, 120b, 120c, and the common unit 13 (outlets) via smart meters 11a, 11b, 11c, and 18. Here, the first distribution board 9 and the second distribution board 10 constitute a distribution device in this embodiment. The parent smart meter 4 corresponds to a first power value acquisition means in this embodiment. The smart meters 11a, 11b, 11c, and 18 correspond to a second power value acquisition means in this embodiment. In this embodiment, the smart meters 19a and 19b are a third power value acquisition means. corresponds to a step.

[0043] As a result, the power generated by the solar cell 15 and the power discharged from the storage battery 14 can be supplied to each of the exclusive units 120a, 120b, 120c, etc. and the common unit 13. In addition, the power discharged from the storage battery 121a in the exclusive unit 120a can be supplied to the other exclusive units 120b, 120c, etc. and the common unit 13 according to settings described below.

[0044] At that time, if the power consumption by the loads in each of the exclusive units 120a, 120b, 120c, etc. and the common unit 13 is greater than the power supplied by the distributed power sources of the storage battery 14 and the solar cell 15, and the power discharged from the storage battery 121a according to the settings, the shortage is replenished by purchasing power from the power grid 3. Also, if the power consumption by the loads in each of the exclusive units 120a, 120b, 120c, etc. and the common unit 13 (including the charging of the storage battery 121a) is less than the power generated by the solar cell 15, it is possible to sell the surplus power that exceeds the charging capacity of the storage battery 14 to the power grid 3.

[0045] The input / output power of the exclusive parts 120a, 120b, 120c, and the common part 13 measured by the smart meters 11a, 11b, 11c, and 18, the input / output power of the storage battery power conditioner 16 measured by the smart meter 19a, and the output power from the solar battery power conditioner 17 to the second distribution board 10 measured by the smart meter 19b are provided to the storage battery controller 5 via the gateway 8c and the hub 7. Here, the storage battery controller 5 corresponds to the power control means in this embodiment. In addition, the amount of power purchased from the power system 3 measured by the parent smart meter 4 and the amount of surplus power sold to the power system 3 are also provided to the storage battery controller 5. In addition, the state of the MPPT control in the solar battery power conditioner 17, information such as the terminal current value and voltage value of the solar battery 15, and information such as the amount of power stored in the storage battery 14 and the storage battery 121a are also provided to the storage battery controller 5 via the gateways 8a, 8b, and 8d and the hub 7.

[0046] The battery controller 5 controls the input / output power of the battery power conditioner 16 and the battery power conditioner 122a, the amount of power purchased from the power grid 3, and the amount of surplus power sold to the power grid 3, based on the power consumption in each of the exclusive areas 120a, 120b, 120c, etc. and the common area 13, the amount of power generated by the solar cell 15, the amount of power stored in the storage battery 14 and the storage battery 121a, the power management policy of the bulk power receiving business operator (hereinafter also referred to as the owner), the power trading market price, etc.

[0047] Similarly, information on the input / output power of the exclusive units 120a, 120b, 120c, and the common unit 13 measured by the smart meters 11a, 11b, 11c, and 18, the input / output power of the storage battery power conditioner 16 measured by the smart meter 19a, and the output power from the solar battery power conditioner 17 to the second distribution board 10 measured by the smart meter 19b are also provided to the management device 2 via the gateway 8c, the hub 7, and the LTE router 6. Similarly, the amount of power purchased from the power grid 3 and the amount of surplus power sold to the power grid 3 measured by the parent smart meter 4 are also provided to the management device 2. Furthermore, information on the state of MPPT control in the solar battery power conditioner 17, the terminal current value, the voltage value, and the like of the solar battery 15, and information on the amount of power stored in the storage battery 14 and the storage battery 121a are also provided to the management device 2 via the gateways 8a, 8b, and 8d, the hub 7, and the LTE router 6. In the embodiment, information on the amount of power purchased from the power grid 3 and the amount of surplus power sold to the power grid 3 may be obtained from billing information from the power company, instead of being provided to the management device 2 from the smart meter.

[0048] (Regarding management devices and fee calculations) 2 is a block diagram showing some of the functions of the management device 2. As shown in FIG. 2, the management device 2 includes an electricity fee calculation unit 201 that calculates electricity fees to be charged to the residents of the private units 120a, 120b, 120c, etc., based on information on the power consumption in the private units 120a, 120b, 120c, etc., and the common unit 13. In addition, the private units 120a, 120b, 120c, etc., each equipped with a storage battery 121a, The management device 2 has a rebate fee calculation unit 202 that calculates a rebate fee to be given to a resident who supplies electricity to other private areas or common areas from a storage battery owned by the resident, such as the resident a. Furthermore, the management device 2 may have an electricity purchase fee calculation unit 203 that calculates an electricity purchase fee to be paid to the electric utility related to the electric power grid 3 based on the amount of electricity purchased from the electric power grid 3, or stores the amount of the electricity purchase fee billed from the electric utility. Note that the hardware configuration of the management device 2 is the same as that of a general server device, and therefore a description thereof will be omitted here.

[0049] The electricity fee calculation unit 201 calculates the electricity fee that the bulk power receiving business operator charges each occupant of the exclusive unit. At this time, the electricity fee is calculated based on the unit price (yen / kWh) set for each power supplier of the electricity supplied to each occupant and the amount of electricity supplied from each power supplier. Specifically, the unit price of electricity is set as a first unit price of electricity that is procured from the power grid 3 and supplied to each power supply destination, a second unit price of electricity that is the unit price of electricity supplied from the solar cell 15, a third unit price of electricity that is the unit price of electricity supplied from the storage battery 14, and a fourth unit price of electricity that is the unit price of electricity supplied from the storage battery 121a. Then, the electricity fee to be charged to each occupant is determined by multiplying the amount of electricity exchanged for each supplier measured by the smart meter by the above-mentioned unit price. The first unit price of electricity may be the same unit price as the procurement price from the power grid 3, or may be a price to which the management cost of the facility is added.

[0050] In addition, when the bulk electricity receiving business operator receives electricity from a storage battery owned by a resident, the rebate fee calculation unit calculates the fee to be rebated to the resident who owns the storage battery. At this time, the rebate fee to be rebated to each resident is determined by multiplying the fifth electricity unit price, which is the preset purchase price from the personally owned storage battery (the selling price of electricity from the resident's perspective), by the amount of electricity supplied.

[0051] The electricity fee billed to each resident may be offset by the refund fee. For example, the electricity fee billed to the resident of the exclusive unit 120a is calculated by the following formula (1). Electricity charge=(first power unit price×power supply from power grid 3)+(second power unit price×power supply from solar cell 15)+(third power unit price×power supply from storage battery 14)+(fourth power unit price×power supplied from storage batteries in other exclusive areas)−(fifth power unit price×power supplied from storage battery 121a) (1)

[0052] The above electricity unit prices can be freely determined by the bulk electricity receiving business operator, but the following unit price settings are considered: For example, the second electricity unit price for solar power generation should be set lower than the first electricity unit price, which is the supply price of electricity procured from the power grid 3 to the resident, and the fifth electricity unit price, which is the purchase price from the resident-owned storage battery 121a.

[0053] In this way, for example, a resident who installs the storage battery 121a can reduce the electricity bill he or she pays by charging the storage battery 121a with the power procured from the solar cell 15 and discharging and consuming it at night. Furthermore, a resident who installs the storage battery 121a can charge the storage battery 121a with the power procured from the solar cell 15 and sell the power of the storage battery 121a to other residents or common areas at a higher unit price than when the power was charged, and can make a profit from the difference.

[0054] Furthermore, it is preferable to set the fourth power unit price, which is the unit price of power supplied from the resident-owned storage battery 121a to other power supply destinations, to be equal to or higher than the fifth power unit price and equal to or lower than the first power unit price. By doing so, it is possible to prevent the bulk power receiving business operator and the residents who do not own storage batteries, such as the residents of the exclusive units 120b and 120c, from incurring losses by procuring power from the storage battery 121a.

[0055] In addition, the second electricity unit price may be set to an amount lower than the unit price of the general electricity rate that the occupants have previously paid to the electric utility. This allows all occupants, who have previously paid electricity rates based on the unit price of the general electricity rate of the electric utility, to enjoy the benefit of being able to pay lower electricity rates based on the power supply from the distributed power source.

[0056] In addition, the amount of power supply used as the basis for calculating the electricity fee for each of the private units 120a, 120b, 120c, etc. is not the net amount of power consumed in each private unit, but the amount of power supply to the common unit 13, which includes the amount of power supplied to the common unit 13. The amount of power supply used for calculating the fee may be calculated, for example, by multiplying the ratio of the power consumption in each private unit 120a, 120b, 120c, etc., for which an electricity fee is charged, by the total amount of power consumed in each of the private units 120a, 120b, 120c, etc. and the common unit 13 of the apartment building 1a. If the storage battery 14 is charged using relatively inexpensive power supplied from the power grid 3 during the night, the amount of power supplied when the storage battery 14 is charged may be added to the amount of power supplied to the common unit 13 to calculate the amount of power supply used for calculating the fee.

[0057] (System Power Control) In this embodiment, it is desirable for the owner and the consumer to cover the power consumption of the apartment house 1a as much as possible with the power generated by the solar cell 15 and reduce the amount of power procured from the power grid 3 to lower the electricity bill. For this reason, when the power generated by the solar cell 15 is surplus, it is possible to charge the storage battery 14 as much as possible and increase the charging rate of the storage battery 14 as much as possible. This reduces the sale of surplus power to the power grid 3 and suppresses the occurrence of a shortage of power supply from the distributed power source, thereby contributing to securing a power source during a power outage. The storage battery controller 5 in this embodiment controls the power of the apartment house 1a under such a policy.

[0058] 3 and 4 are flowcharts showing an example of power control processing for the storage battery using the power supply system 1 in this embodiment. The flow of the processing will be described below with reference to FIGS. 3 and 4. First, as shown in FIG. 3, the storage battery controller 5 controls the power generated by the solar cell 15 (hereinafter referred to as P PV The total power consumption of the entire apartment building 1a (hereinafter referred to as P L It is determined whether the value is greater than the value (S101).

[0059] Here, PPV >P L If it is determined that the remaining capacity of the storage battery 14 (hereinafter, C CR The full charge capacity of the storage battery 14 (hereinafter, C CF Here, it is determined whether the value is less than C CR <C CF If it is determined that the battery is in a standby state, power is supplied from the solar cell 15 to the storage battery 14 via the solar cell power conditioner 17 and the storage battery power conditioner 16, and the storage battery 14 is charged (S103). PV From P L The value obtained by subtracting CC It is determined whether the difference is less than the predetermined value (S104).

[0060] Here, P PV -P L <P CC If it is determined that (for example, P PV =10kw, P L =8kw, P CC = 4 kW), the battery controller 5 stops charging all the batteries in the exclusive units 120a, 120b, 120c, . . . (S105), and ends a series of flows for the time being.

[0061] On the other hand, in step S102, C CR <C CF If it is determined that the above is not the case, the power supply from the solar cell 15 to the storage battery 14, i.e., the charging of the storage battery 14, is stopped (step S106), and the process proceeds to the loop L1. PV -P L <P CC If it is determined that the PV =20kw, P L =10kw, P CC = 4kw), the process proceeds to loop L1.

[0062] In the loop L1, the process from step S107 onwards is repeated for all the batteries in the exclusive area. In step S107, the remaining capacity (hereinafter, C nR ) is the full charge capacity (hereafter, C nF It is determined whether the difference is less than C (S107). nR <C nF If it is determined that the battery is in the exclusive area, power is supplied from the solar cell 15 to the storage battery (e.g., 121a) of the exclusive area via the solar cell power conditioner 17, the power distribution device, and the storage battery power conditioner (e.g., 122a) of each exclusive area, and the storage battery of the exclusive area is charged (S108). nR <C nF If it is determined that the charging is not necessary, charging to each exclusive section is stopped (S109). Then, when the process of loop L1 has been executed for the storage batteries of all the exclusive sections, a series of flows is temporarily terminated.

[0063] Continuing, based on FIG. 4, in step S101, PV >P L The flow when it is determined that the battery is not in the above-mentioned condition will be described. PV >P L If it is determined that it is not, CR is a predetermined parameter of the storage battery 14, which is the remaining capacity during a power outage (hereinafter, C CE Here, it is determined whether C is larger than CR >C CE If it is determined that the power is equal to or greater than the power supply destination, the power stored in the storage battery 14 is discharged and supplied to each power supply destination (S112). PV From P L The value obtained by subtracting this is the maximum discharge power value of the storage battery 14 (hereinafter, P CD Here, it is determined whether P PV -P L <P CD If it is determined that this is the case, the battery controller 5 stops discharging all of the batteries in the exclusive units 120a, 120b, 120c, . . . (S114), and temporarily ends a series of flow.

[0064] On the other hand, in step S111, C CR >C CE If it is determined that the discharge from the storage battery 14 is not the case, the discharge from the storage battery 14 is stopped (S115), and the process proceeds to the process of loop L2. PV -P L <P CD If it is determined that this is not the case, the process proceeds to loop L2.

[0065] In the loop L2, the processes from step S116 onwards are repeatedly executed for all the batteries in the exclusive section. In step S116, the battery controller 5 nR is the external supply interruption remaining capacity (hereinafter, C nOR It is determined whether the value is greater than C (S116). nOR C is the lower threshold of the remaining capacity at which the power supply to other private and common areas should be stopped. nOR The owner of the battery may be able to freely set this, for example via a battery power conditioner, and it is advisable to set a value that allows efficient use of the battery's power depending on seasonal factors (for example, setting it higher in summer as power for air conditioning at night) and the schedule for the day (for example, setting it lower on days when the owner plans to be away at night).

[0066] In step S116, C nR >C nOR If it is determined that this is the case, the battery controller 5 discharges the power from the battery of the exclusive area (e.g., 121a) via the battery power conditioner (e.g., 122a) of each exclusive area, and supplies power to the other exclusive areas and the common area 13 via the first distribution board 9 (S117).

[0067] On the other hand, in step 116, nR >C nOR If it is determined that it is not, nR The remaining capacity during a power outage (hereinafter referred to as C nE Here, it is determined whether C is larger than nR>C nE If it is determined that the power supply is not available, the battery controller 5 discharges the battery, but stops the power supply to the other exclusive areas and the common area 13 (S119). nR >C nE If it is determined that this is not the case, the discharge of the storage batteries in the exclusive parts is stopped (S120). Then, when the process of loop L2 has been executed for the storage batteries in all the exclusive parts, a series of flows is temporarily terminated.

[0068] The storage battery controller 5 repeatedly executes the above-mentioned flow as needed to The power supply system 1 performs power control. FIG. 5 shows a hypothetical example of such power control for one day. As shown in FIG. 5, the storage battery controller 5 controls the power P generated by the solar cell 15. PV is used preferentially to cover the power consumption of the entire facility, and if any surplus occurs, it is allocated in the following order: charging the common area storage battery, charging the private area storage battery, and selling the power to the power grid 3. Then, if the amount of power generated by the solar cells 15 is not enough to cover the power consumption of the entire facility, power is procured in the following order: discharging the common area storage battery, discharging the private area storage battery, and purchasing power from the power grid 3. This makes it possible to reduce the amount of power procured from the power grid 3 as much as possible, making it possible to keep electricity bills low overall.

[0069] (Control during power outages) The above control example is an example of a normal time when the power grid 3 and the power supply system 1 are interconnected. However, an example of a control process during a power outage is shown in FIG. 6. As shown in FIG. 6, the process performed by the storage battery controller 5 is almost the same as that during a normal time. In step S211 and step S218 in the loop L3, cR and C nRHowever, it differs in that it determines whether the remaining capacity is greater than 0 (rather than the remaining capacity for a power outage). That is, during a power outage, the storage battery controller 5 performs control to discharge the power of the storage battery as long as there is remaining capacity in the storage battery. It is also possible to perform control such that, even during normal control, the discharge continues as long as there is remaining capacity in the storage battery, without setting the remaining capacity for a power outage as a parameter. (Variation 1) In the first embodiment, in step S116, whether or not to stop the power supply to other exclusive parts and common parts is determined based on the remaining external power supply stoppage amount (C nOR ), but such a judgment may be made using other indices. Specifically, for example, the external supply limit power amount (hereinafter, C nOL 7 shows an example of processing when judging whether or not to stop the power supply to other exclusive parts and common parts using such an index. In FIG. 7, the same processes as in the first embodiment are denoted by the same reference numerals as in the first embodiment. As shown in FIG. 7, the processing performed by the storage battery controller 5 is almost the same as in the first embodiment, with the exception of step S316 in loop L4. In step S316, the amount of power (hereinafter referred to as C) supplied by the storage battery in the exclusive part to other exclusive parts and common parts within a predetermined time period (for example, within 24 hours from 00:00 to 24:00) is calculated. nO Let C be nOL Then, C nO <C nOL If it is determined that the nO <C nOL If it is determined that this is not the case, the process proceeds to step S118.

[0070] (Variation 2) Further, another example of an index for determining whether or not to stop the power supply to other private areas and common areas will be shown. Specifically, this can be determined based on whether or not it is within the power supply permission time, which is the time period during which power supply to other private areas and common areas is permitted. FIG. 8 shows an example of processing for determining whether or not to stop the power supply to other private areas and common areas using such an index. In FIG. 8, the same processes as in the first embodiment are designated by the same reference numerals. As shown in FIG. 8, the processing performed by the storage battery controller 5 is almost the same as in the first embodiment, with the exception of step S416 in loop L5. In step S416, the current time (hereinafter referred to as T) is compared with the external supply start time (hereinafter referred to as T nS After the end of external supply (hereafter referred to as T nE Then, nS ≦T≦T nE If it is determined that the nS ≦T≦T nE If it is determined that this is not the case, the process proceeds to step S118.

[0071] As described above, when the power consumption of a complex facility exceeds the power supply capacity of distributed power sources, it is possible to determine based on various indicators whether or not to supply power from the storage batteries in the private areas to other private areas and common areas, thereby enabling flexible power supply according to the needs of residents equipped with storage batteries. In addition, the indexes exemplified above may be used not only individually but also in combination, and power may be supplied to the outside when any two or all of the conditions are satisfied.

[0072] <Example 2> The power supply system 1 of the first embodiment described above is configured to be able to cooperate with a storage battery provided in the exclusive area, but instead of or in addition to the storage battery provided in the exclusive area, a storage battery mounted on the electric vehicle may be included. That is, a power supply system equipped with V2H may be used. Such a power supply system 900 will be described below.

[0073] FIG. 9 is a block diagram showing a schematic configuration of a power supply system 900 according to this embodiment. In FIG. 9, solid lines connecting each block indicate power lines, and the direction of the arrow indicates the direction in which power is transmitted. The power supply system 900 according to this embodiment is assumed to be applied to an apartment house 901. As in the first embodiment, the apartment house 901 is electrically connected to a power system 960. When the power supplied by the solar cell 940 and the storage battery 930 (hereinafter collectively referred to as a distributed power source) is less than the power consumption of the multiple power supply destinations and there is a power shortage, it is possible to purchase power from the power system 960. When the power supplied by the distributed power source is more than the power consumption of the multiple power supply destinations, it is possible to sell the surplus power to the power system 960. The power exchanged between the power system 960 and the apartment house 901 is measured by a smart meter 951.

[0074] Private areas 910a, 910b, ... 910n, ... 910x are assumed as multiple power supply destinations of power supply system 900. These are, for example, each room (hereinafter also referred to as the occupants) in apartment building 901. Also, loads 911a, 911b, ... 911n, ... 911x in private areas 910a, 910b, ... 910n, ... 910x are electrical appliances and the like in each room of apartment building 901. Also, the power supply destinations include a load (not shown) in common area 920.

[0075] Then, the power exchanged among the multiple power supply destinations, distributed power sources, and power grid 960 is transmitted to a power distribution device 950, where it is appropriately distributed and distributed. The power distributed in this manner and the power transmitted to the power distribution device 950 are measured by smart meters 915a, 915b...915n...915x, 921, 931, and 941.

[0076] Although not shown in Fig. 9, in the power supply system 900 according to this embodiment, information on power measured by each smart meter is also sent to the storage battery controller via a gateway and a hub. In addition, similar information is provided to a management device (not shown) including a fee calculation means.

[0077] In the power supply system 900 according to this embodiment, as shown in Fig. 9, the exclusive unit 910a is equipped with a storage battery 912a, and the exclusive unit 910b is equipped with a storage battery 912b, but there are also exclusive units (e.g., exclusive unit 910n, exclusive unit 910x) that do not have these. Furthermore, the exclusive unit 910a is equipped with an electric vehicle (EV) 913a and a charger / discharger (EV power conditioner) 914a. Similarly, the exclusive unit 910n is equipped with an EV 913n and a charger / discharger 914n. The EV 913a and EV 913n each have a storage battery, and the EV 913a is configured to be able to exchange power with the exclusive unit 910a via the charger / discharger 914a.

[0078] The power transfer between the power distribution device 950 and the EV 913a may be processed in the same manner as the power transfer between the power distribution device 950 and the storage battery 912a. For example, the power control and the calculation of the electricity fee and the rebate fee may be performed in the following manner. In this regard, it is also possible to process the capacity of the storage battery 912a installed in the exclusive section 910a as being increased by the capacity of the storage battery installed in the EV 913a. Also, it is possible to configure the remaining power outage (+driving) capacity and the remaining external supply outage capacity to be set independently for the EV 913a.

[0079] According to the power supply system 900 as described above, it becomes possible to apply the present invention to a power supply system combined with so-called V2H.

[0080] <Other> The above examples merely exemplify the present invention, and the present invention is not limited to the above specific forms. Various modifications of the present invention are possible within the scope of its technical concept. For example, in the above embodiment, an apartment house 1a is exemplified as a complex facility having multiple power supply destinations, but the complex facility that is the subject of the present invention is not limited to an apartment house. For example, a shared office, an industrial park, etc. are also subject to the present invention. In addition, in the above embodiment, a solar cell is exemplified as an example of a distributed power source, but the distributed power source that is the subject of the present invention is not limited to a solar cell, and includes other power source devices such as a wind power generation device, a geothermal power generation device, and a biomass power generation device.

[0081] In addition, in each of the above examples, one smart meter is installed per exclusive area, but other configurations are also possible. For example, a configuration may be adopted in which a smart meter that measures the power consumption of the load in one exclusive area and a smart meter that measures the power exchange with the storage battery in that exclusive area are installed per exclusive area. In this case, it is possible to measure the power exchange with the storage battery more accurately. In addition, a parent smart meter that measures the power exchange with the power grid may also be installed separately for purchasing power and for selling surplus power.

[0082] Conversely, it is also possible to omit some of the smart meters. Specifically, for example, in the configuration in which the smart meter 19a in the first embodiment is omitted, the storage The value of the power exchanged between the mains inverter 16 and the second distribution board 10 may be calculated based on the power values ​​obtained from the other smart meters. The smart meter may be built into the inverter. With such a configuration, it is possible to reduce the cost of the system by omitting the smart meter.

[0083] In the power supply system according to the second embodiment, the electric vehicle (storage battery) is installed in parallel with the storage battery in each private area, but it is also possible to install it in parallel with the storage battery in the common area. In this case, the electricity fee may be calculated, for example, by linking a specific private area occupant with a specific charger / discharger by contract, based on the exchange of electricity with the specific charger / discharger. The charge / discharge control of the EV's storage battery may be processed in the same way as the storage battery in the private area, or in the same way as the storage battery in the common area.

[0084] In addition, in the above second embodiment, an electric vehicle has been described as an example, but it is also possible to configure a power supply system that combines other electric vehicles such as a plug-in hybrid vehicle (PHV) or a plug-in hybrid electric vehicle (PHEV).

[0085] <Additional Notes> In the following, the components of the present invention will be described with reference to the reference numerals in the drawings in order to make it possible to compare the components of the present invention with the configurations of the embodiments. (Invention 1) A power supply system (1) for a complex facility having a plurality of power supply destinations (120a, 120b, 120c, ...), A distributed power source (14, 15) capable of supplying power to the plurality of power supply destinations; At least one first storage battery (121a) individually provided in any one of the power supply destinations and, a power distribution device (9) connected to a power system (3), the distributed power sources, and each of the plurality of power supply destinations so as to be able to transmit and receive electric power; a first power value acquiring means (4) for acquiring a value of power exchanged between the power distribution device and the power grid; second power value acquiring means (11a, 11b, 11c, ...) for acquiring a value of power exchanged between the power distribution device and each of the plurality of power supply destinations; a third power value acquisition means (19a, 19b) for acquiring a value of power exchanged between the power distribution device and the distributed power sources; a power control means (5) for controlling the exchange of power between the power distribution device and each of the power supply destinations, the exchange of power with the power grid, the exchange of power with the distributed power sources, and the power related to the generation and / or charging / discharging of the distributed power sources; and a fee management means (2) for calculating an electricity fee to be charged to each of the plurality of power supply destinations and a rebate fee for the power supply destination equipped with the first storage battery, based on the power values ​​acquired by each of the power value acquisition means. [Explanation of symbols]

[0086] 1, 900... Power supply system 1a, 901...Apartment housing 2...Management device 3, 960...Power system 4. Parent smart meter 5. Battery controller 6. LTE router 7. Hub 8a, 8b, 8c, 8d... Gateway 9. First distribution board 10 Second distribution board 11a, 11b, 11c, 18, 19a, 19b, 915a, 915b, 915n, 915x, 921, 931, 941, 951...Smart meters 120a, 120b, 120c, 910a, 910b, 910n, 910x... Exclusive area 121a, 912a, 912b... Private storage battery 12a, 12b, 12c, 911a, 911b, 911n, 911x... Private area load 13...Common area 14, 930... Battery 15, 940...Solar cells 16... Battery Power Conditioner 17 Solar power conditioner 913a, 913n... Electric vehicles 914a, 914n...charger / discharger

Claims

1. A power supply system for a complex facility having a plurality of power supply destinations, A distributed power source capable of supplying power to the plurality of power supply destinations; One or more first storage batteries individually provided in at least one of the power supply destinations; a power distribution device connected to a power grid, the distributed power sources, and each of the plurality of power supply destinations so as to be able to transmit and receive power; a first power value acquiring means for acquiring a value of power exchanged between the power distribution device and the power grid; a second power value acquiring unit that acquires a value of power exchanged between the power distribution device and each of the plurality of power supply destinations; a third power value acquisition means for acquiring a value of power exchanged between the power distribution device and the distributed power sources; a power control means for controlling the exchange of power between the power distribution device and each of the power supply destinations, the exchange of power between the power distribution device and the power grid, the exchange of power between the power distribution device and the distributed power sources, and the power related to the generation and / or charging / discharging of the distributed power sources; a fee management means for calculating an electricity fee to be charged to each of the plurality of power supply destinations and a rebate fee for the power supply destination that includes the first storage battery, based on the power values ​​acquired by the power value acquisition means; It is equipped with The distributed power source includes a power generation facility and a second storage battery provided for shared use by the facility, The fee management means includes: calculating the electricity rate based on the power values ​​acquired by each of the power value acquisition means, a first power unit price which is a preset unit price of power supplied from the power system to the power supply destination, a second power unit price which is a unit price of power supplied from the power generation facility to the power supply destination, a third power unit price which is a unit price of power supplied from the second storage battery to the power supply destination, and a fourth power unit price which is a unit price of power supplied from the power supply destination equipped with the first storage battery to another power supply destination; calculating the rebate fee based on a fifth electricity unit price, which is a purchase price of electricity supplied from a power supply destination having the first storage battery to the other power supply destinations that is set in advance, and an amount of electricity supplied from the power supply destination having the first storage battery that is the subject of the rebate fee calculation to the other power supply destinations; A power supply system comprising:

2. The power supply system according to claim 1 , wherein the second unit price of electricity is set to be lower than the first unit price of electricity.

3. 3 . The power supply system according to claim 1 , wherein the fourth power unit price is set to be equal to or higher than the fifth power unit price and equal to or lower than the first power unit price. 4 .

4. 4 . The power supply system according to claim 1 , wherein the second unit price of electricity is set to be lower than the fifth unit price of electricity.

5. 5. The power supply system according to claim 1, wherein the fee management means calculates the electricity fee for each of the power supply destinations using a fee calculation amount of power obtained based on a ratio of the amount of power supplied to the power supply destinations that are subject to the electricity fee calculation to a total amount of power supplied to all of the power supply destinations in the complex for which the electricity fee is charged.

6. For each of the first storage batteries, an external supply stop remaining amount is set in advance, the external supply stop remaining amount being a lower limit threshold of a remaining capacity at which the power supply to each of the other power supply destinations should be stopped, The power supply system according to any one of claims 1 to 5, characterized in that, when the remaining capacity of the first storage battery becomes equal to or less than the external supply stop remaining capacity, the power control means performs control to stop power supply from a power supply destination having the first storage battery to the other power supply destinations.

7. For each of the first storage batteries, an external supply limit amount of power, which is an upper limit threshold of the amount of power permitted to be supplied to the other power supply destinations within a predetermined period, is set in advance, The power supply system according to any one of claims 1 to 6, characterized in that the power control means performs control to stop power supply from a power supply destination having the first storage battery to the other power supply destinations when the amount of power supplied from the first storage battery to the other power supply destinations within a specified period is equal to or greater than the external supply limit power amount.

8. A power supply permission time, which is a time period during which the first storage battery is permitted to supply power to the other power supply destinations, is set in advance, The power supply system according to any one of claims 1 to 7, characterized in that the power control means controls the supply of power from a power supply destination having the first storage battery to another power supply destination only within the power supply permitted time.

9. The power supply system according to claim 1 , characterized in that the second power value acquisition means includes an individual power storage power value acquisition means for acquiring only the value of power exchanged with the first storage battery.

10. The power supply system according to claim 1 , wherein the first storage battery and / or the distributed power source includes a storage battery mounted on an electric vehicle.

11. A program for causing a computer to function as the power control means in the power supply system according to any one of claims 1 to 10.

12. A program for causing a computer to function as a fee management unit in the power supply system according to any one of claims 1 to 10.

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