Power supply system, watt-hour meter, and information processing device

Abstract

To provide a power supply system, a watt-hour meter, and an information processing device that can easily introduce a distributed power source such as a solar power generation system into an apartment building while maintaining an existing power receiving contract. [Solution] The power supply system is a power supply system for a condominium that includes multiple private and common areas that have individual low-voltage power receiving contracts with an electric power company, and is equipped with: a first electricity meter installed at the power draw point for the entire condominium and measures the amount of electricity purchased from the electric power company; an addition unit that adds up the amount of electricity measured by second electricity meters installed in each of the multiple private and common areas and managed by the electric power company; a measurement value calculation unit that calculates the amount of self-consumption electricity from distributed power sources in the condominium by subtracting the amount of purchased electricity from the added-up amount of electricity; and a settlement unit that settles the compensation for the amount of self-consumption electricity to the power generation company of the distributed power source based on the calculated amount of self-consumption electricity.

Description

[Technical Field]

[0001] The present disclosure relates to a power supply system, a watt-hour meter, and an information processing device. [Background technology]

[0002] In apartment buildings, it is common for each dwelling unit (private area) and common area to enter into individual low-voltage power receiving contracts with electric power companies. In recent years, as the unit price of selling electricity has fallen, the importance of self-consumption of electricity generated by solar power generation equipment installed on the roof of apartment buildings has increased. This is because self-consumption generally offers a higher return on investment than selling electricity. However, existing power supply systems for apartment buildings have presented challenges, such as the difficulty of fairly and accurately measuring the amount of electricity consumed by the entire apartment building when the electricity generated by the solar power generation equipment is self-consumed. Specifically, the following issues can be cited: Because each unit and common area has an individual contract with the electric power company, even if electricity generated by the solar power generation equipment is used in each unit or common area, the electric power company's existing meter measures that consumption as purchased electricity from the grid. This has led to the problem of residents being charged for electricity they themselves consumed. As a result, power generation companies are unable to collect individual fees for the electricity consumed by each unit or common area, making it difficult to recover their investment. Due to these challenges, the current situation is that the introduction of solar power generation equipment into apartment buildings has made little progress. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7100443 Summary of the Invention [Problem to be solved by the invention]

[0004] A conventional solution is the "bulk power receiving system" disclosed in Prior Art Document 1, but this system has not yet become widely adopted due to the following issues. Specifically, the high-voltage bulk power receiving system requires the installation of high-voltage power receiving equipment (such as a cubicle), the installation or replacement of watt-hour meters in each dwelling unit, the appointment of a chief electrical engineer, and annual planned power outages, resulting in significant initial investment, maintenance costs, and operational constraints. On the other hand, while low-voltage bulk power receiving contracts do not require the installation of high-voltage power receiving equipment, they have the issue that the unit price of electricity is not as cheap as with high-voltage bulk power receiving. Furthermore, in both bulk power receiving systems, the meters in each apartment building are treated like tenant meters, meaning that the bulk contract holder must bill each resident, which poses a major issue by restricting residents' freedom of choice of power company.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a power supply system, an electricity meter, and an information processing device that can easily introduce solar power generation to apartment buildings while maintaining existing power receiving contracts. [Means for solving the problem]

[0006] A first aspect of the present disclosure is an electric power supply system in an apartment building that includes multiple private areas and common areas that have individual low-voltage power receiving contracts with an electric power company, and is equipped with: a first electricity meter installed at the power draw point for the entire apartment building and measuring the amount of electricity purchased from the electric power company; an addition unit that adds up the amount of electricity measured by second electricity meters installed in each of the multiple private areas and common areas and managed by the electric power company; a measurement value calculation unit that calculates the amount of self-consumption electricity from a distributed power source in the apartment building by subtracting the amount of purchased electricity from the added-up amount of electricity; and an adjustment unit that adjusts compensation for the amount of self-consumption electricity to the power generation company of the distributed power source based on the calculated amount of self-consumption electricity.

[0007] A second aspect of the present disclosure is an electricity meter that is installed at the power intake point for an entire apartment building that includes multiple private and common areas that have individual low-voltage power receiving contracts with an electric power company, measures the amount of electricity purchased from the electric power company, and subtracts the amount of electricity purchased from the total amount of electricity measured by electricity meters installed in each of the multiple private and common areas and managed by the electric power company, thereby enabling the amount of electricity consumed by the apartment building itself from distributed power sources to be calculated.

[0008] A third aspect of the present disclosure is an information processing device that includes at least one processor that adds up the amount of electricity measured by electricity company-managed electricity meters installed in multiple private areas and common areas that have individual low-voltage power receiving contracts with the electric power company, calculates the amount of electricity consumed by the distributed power source in the apartment building by subtracting from the total amount of electricity the amount of electricity purchased from the electric power company measured by an electricity meter installed at the power draw point to the entire apartment building that includes the multiple private areas and common areas, and settles compensation for the amount of electricity consumed by the distributed power source to the power generation company of the distributed power source based on the calculated amount of electricity consumed. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to obtain an electric power supply system, an electric energy meter, and an information processing device that can easily introduce solar power generation to an apartment building while maintaining an existing electricity receiving contract. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a system diagram showing a configuration example of a power supply system 1000 according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a block diagram showing an example of the hardware configuration of the information processing device 100. As shown in FIG. [Figure 3] FIG. 3 is a system diagram showing a first example of a power system configuration for fairly and accurately calculating the amount of private power consumption of a distributed power source in an apartment building while maintaining an existing low-voltage individual power receiving contract. [Figure 4] FIG. 4 is a system diagram showing a second example of a power system configuration for fairly and accurately calculating the amount of self-consumption electricity of a distributed power source in an apartment building while maintaining an existing low-voltage individual power receiving contract. [Figure 5] FIG. 5 is a system diagram showing a third example of a power system configuration for fairly and accurately calculating the amount of self-consumption electricity of a distributed power source in an apartment building while maintaining an existing low-voltage individual power receiving contract. [Figure 6] FIG. 6 is a system diagram showing a comparison between the current system and the integrated meter reading system of the present disclosure when purchasing electricity in photovoltaic power generation. [Figure 7] FIG. 7 is a system diagram showing a comparison between the current system and the integrated meter reading system of the present disclosure when selling surplus power in photovoltaic power generation. [Figure 8] FIG. 8 is a system diagram that schematically shows the relationship between self-consumption, power purchase, and power sale in this embodiment. [Figure 9] FIG. 9 is a flowchart illustrating the operation of the power supply system of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the embodiments will be described in detail with reference to the drawings.

[0012] 1 is a system diagram showing an example configuration of a power supply system 1000 according to an embodiment of the present disclosure. The power supply system 1000 is a system that enables fair and accurate measurement of the amount of private power consumption of distributed power sources in an apartment building while maintaining an existing low-voltage individual power receiving contract. Hereinafter, the power supply system 1000 may be simply referred to as a power supply system, a system, or the like.

[0013] The power supply system includes a power company 10, a distributed power source installed in an apartment building 20, and a configuration for measuring and settling power. The power company 10 is provided with an information processing device 100. The information processing device 100 is, for example, a server, and processes acquired power amount data. The information processing device 100 processes the acquired power amount data via a network 30 for transmitting and receiving power amount data from each watt-hour meter and other related information. The information processing device 100 includes at least one processor, and includes an accumulating unit 101, a measurement value calculating unit 102, an accounting unit 103, and the like, which are realized by the processor based on a predetermined program. Details of these functions will be described later.

[0014] The apartment building 20 has multiple private areas (e.g., dwelling unit A, dwelling unit B, ...) and common areas (e.g., elevators, lighting, etc.) that have individual low-voltage power receiving contracts with the electric power company, and each is equipped with a second electricity meter 220_1 to 220_n (n is a natural number greater than or equal to 1) managed by the electric power company.

[0015] A first watt-hour meter 210 (main watt-hour meter) is installed at the power intake point of the apartment building 20. The first watt-hour meter 210 measures the total amount of power supplied to the entire apartment building. The first watt-hour meter 210 is not a meter for a power receiving contract, but is used as a measuring point for calculating the self-consumption amount of the distributed power source 41. The first watt-hour meter 210 may include a power purchase meter that accumulates power when purchasing power from the power company, and a power sales meter that accumulates power generated by the distributed power source 41 (for example, a solar power generation facility) when selling the power.

[0016] The distributed power source 41 is operated by a power generation company 40 and is installed, for example, on the roof of an apartment building or other collective housing. The distributed power source 41 can supply generated power to each private area and common area of ​​the collective housing 20. When solar power is consumed in each private area, common area, etc., the amount of power consumed (self-power consumption) is calculated by the measurement value calculation unit 102 of the information processing device 100.

[0017] Specifically, first, summing unit 101 sums up the amounts of power measured by second watt-hour meters 220_1 to 220_n installed in each dedicated area and common area in the apartment building, and measurement value calculation unit 102 calculates the amount of self-power consumption by subtracting from the sum the amount of power purchased from the power company measured by first watt-hour meter 210 installed at the power draw point. That is, measurement value calculation unit 102 calculates the amount of power derived from solar power (self-power consumption) consumed in each dedicated area and common area by subtracting the amount of power purchased measured by first watt-hour meter 210 installed at the power draw point for the entire apartment building from the sum (ΣWh) of the amounts of power measured by the multiple second watt-hour meters 220. Hereinafter, when no particular distinction is required, second watt-hour meters 220_1 to 220_n may be referred to as second watt-hour meter 220.

[0018] Then, the settlement unit 103 settles the price, for example, to the power generation company 40, based on the amount of self-power consumption calculated by the measurement value calculation unit 102. Note that the measurement values ​​and settlement results of the second watt-hour meters 220_1 to 220_n, the first watt-hour meter 210, etc. may be stored on the cloud as necessary and provided in a format that can be referenced by residents and power generation companies. Note that hereinafter, the power company 10, the apartment building 20, the network 30, the power generation company 40, the distributed power source 41, and the information processing device 100 may be simply referred to as the power company, the apartment building, the network, the power generation company, the distributed power source, and the information processing device.

[0019] 2 is a block diagram showing an example of the hardware configuration of the information processing device 100. The information processing device 100 is a processing device that fairly and accurately measures the amount of privately consumed electricity from distributed power sources in an apartment building that has an individual low-voltage power receiving contract with an electric power company, and performs calculations, calculations, and other processing to collect power consumption data and settle the cost, and is composed of multiple hardware components.

[0020] The information processing device 100 is installed, for example, in an electric power company and includes a central processing unit (CPU) 1 that performs arithmetic processing, an input / output interface (I / F) 2 connected to external input and output devices such as a keyboard, mouse, and display, an R / W unit 3 that reads from and writes to external storage media such as USB memory and optical disks, and a network interface (I / F) 4 that transmits and receives data to and from external devices such as electric power companies and power generation companies via a communication network. The information processing device 100 also includes a storage unit 5 that stores various programs 5a for processing measurement data acquired from a watthour meter, and a memory 6 that is used as a work area when the programs are executed and when data is processed. These components are interconnected via a system bus 7 and exchange data and control signals.

[0021] The CPU 1 reads and executes the program 5a stored in the storage unit 5, thereby realizing the functions of the summing unit 101, the measurement value calculation unit 102, and the settlement unit 103, which are the main functions of the information processing device 100 shown in Fig. 1. The CPU 1 also acquires measurement values ​​from the first watt-hour meter 210, the second watt-hour meter 220, etc. via the network I / F 4, and may transmit settlement results, history information, etc. to a cloud server or the like as needed.

[0022] Figure 3 is a system diagram showing a first example of a power system configuration for fairly and accurately calculating the amount of self-consumption power of distributed power sources in an apartment building while maintaining the existing low-voltage individual power receiving contract. The example in Figure 3 is a case where low-voltage power is directly drawn from the power company for each small residential building.

[0023] In this configuration example, distributed power sources 41 (solar panels) are installed on the rooftops of each residential building, and the output of the distributed power sources 41 is connected to a power collection panel via a power conditioner (PCS). The power collection panel is connected to a main line that supplies power to the private areas (each residential unit) and the common areas. The main line branches according to the desired load and is connected to the primary side of a second watt-hour meter 220, distributing the generated power throughout the facility according to its intended use. Of particular importance, the first watt-hour meter 210, which acts as a "master watt-hour meter" that can measure the amount of power purchased and sold, is connected to the point of interconnection with the electric power company, allowing for centralized management of power transfer with the grid. The master watt-hour meter measures the amount of power consumed by the entire apartment complex. Note that Figure 3 shows the case of low-voltage lead-in, and Figure 4 shows the case of high-voltage lead-in. This configuration example assumes the low-voltage lead-in shown in Figure 3.

[0024] In the case of low-voltage service, the line enters a service switchboard from the grid and branches into wiring for multiple private areas and common areas. The wiring for the common areas connects to a common distribution board via a common meter. From the common distribution board, the line is routed to common area loads. Common area loads include lighting equipment, elevators (ELVs), and pump equipment installed in corridors and staircases, for example. On the other hand, the wiring for the private areas branches out to each dwelling unit and connects to each unit's distribution board via a meter dedicated to each unit. The secondary side of each unit's distribution board is routed to the household loads within the home.

[0025] A second watt-hour meter 220 is installed on the primary side of each unit distribution board, and this watt-hour meter measures the amount of power consumed by each unit individually. A second watt-hour meter 220 is also installed on the common distribution board, and this watt-hour meter measures the amount of power consumed in the common area.

[0026] The summing unit 101 sums up the amount of electricity measured by multiple watt-hour meters (second watt-hour meters) installed in multiple private areas (each dwelling unit) and common areas in the apartment building shown in Figure 3, and the measurement value calculation unit 102 calculates the amount of self-powered electricity by subtracting the amount of purchased electricity measured by the integrated watt-hour meter (first watt-hour meter 210) installed at the intake point from the sum. The settlement unit 103 uses the amount of self-powered electricity to settle the price to the power generation company.

[0027] With this configuration example, each resident can accurately grasp the amount of power generated by the dispersed power source 41 that they consume, while maintaining their existing low-voltage power receiving contract with the power company.

[0028] Furthermore, through integrated measurement and calculation, it is possible to accurately grasp the utilization rate of generated electricity and the amount of surplus electricity sold, making it possible to clearly indicate the amount of self-consumption of solar power generation, even for small residential buildings, regardless of whether it is in common or private areas, thereby promoting the effective use of distributed power sources such as solar power generation. This method also does not involve the large initial investment, maintenance costs, or operational restrictions that are associated with the high-voltage bulk power receiving method, and maintains the advantage of allowing residents to freely choose their power company. However, if a resident enters into an individual contract with a retail electricity supplier other than the electricity supplier that manages the central meter, they may need to obtain the consent of that retail electricity supplier.

[0029] Figure 4 is a system diagram showing a second example of a power system configuration for fairly and accurately calculating the amount of self-consumption electricity of distributed power sources in an apartment building while maintaining existing low-voltage individual power receiving contracts. The example in Figure 4 is applied to an apartment building that receives high-voltage electricity from the power company, and is a case in which high-voltage electricity is drawn for each medium-sized residential building. Even in this case, each dwelling unit maintains an individual low-voltage power receiving contract with the power company.

[0030] In this configuration example, photovoltaic power generation equipment, an example of a distributed power source 41, is installed on the rooftop of each residential building, and the output of each equipment is connected to a power collection panel via a power conditioner. The power collection panel is connected to a main line that supplies power to the private areas (each residential unit) and the common areas, and the main line branches according to the desired load and is connected to the primary side of the second watt-hour meter 220, so that the generated power is distributed throughout the facility according to its use. Of particular importance is that the first watt-hour meter 210, which serves as a "master watt-hour meter" that can measure the amount of power purchased and sold, is connected to the point of interconnection with the power company, and power transfer with the grid is managed centrally. The master watt-hour meter is responsible for measuring the amount of power consumed by the entire apartment complex.

[0031] At the point of connection with the power company, a first watt-hour meter 210, which is a central watt-hour meter equipped with a metering transformer compatible with high-voltage lead-in, is installed, and the amount of electricity purchased from the grid and the amount of electricity sold to the grid are measured and managed in an integrated manner. This central watt-hour meter is responsible for measuring the amount of electricity consumed by the entire apartment complex.

[0032] The high-voltage power drawn in is converted to low voltage through a pad-mounted transformer and branched off into wiring for multiple private areas and common areas at the service switchboard. The wiring for the common areas is connected to a common distribution board via a common meter. From the common distribution board, the power is routed to the loads in the common areas. Common area loads include lighting equipment, elevators (ELVs), and pump equipment installed in corridors and staircases, for example. On the other hand, the wiring for the private areas is branched off to each dwelling unit on the first to seventh floors, for example, and connected to each unit's distribution board via a meter dedicated to each unit. The secondary side of each unit's distribution board is routed to the household loads within the home.

[0033] A second watt-hour meter 220 is installed in front of each unit's distribution board, and this watt-hour meter measures the amount of power consumed by each unit individually. A second watt-hour meter 220 is also installed in the common distribution board, and this watt-hour meter measures the amount of power consumed in the common area. Note that while each unit's distribution board is usually installed in a dedicated area such as near the entrance to a room, the second watt-hour meter 220 is often installed in a common wiring space outside the unit.

[0034] Furthermore, a storage battery is connected to the common distribution panel, which stores a portion of the surplus electricity generated by solar power generation and can supplement the power demand of the common and private areas as needed. The storage battery may be, for example, a lithium-ion battery (LiB), a nickel-metal hydride battery, or an all-solid-state battery. Note that in this disclosure, an example of the distributed power source 41 is power from a solar power generation facility installed in a home, but the distributed power source 41 may also include fuel cells, wind power generation, biomass power generation, and the like, in addition to solar power generation facilities. This enables the effective use of generated power and the leveling of power loads through peak shifting, further increasing the flexibility of energy management.

[0035] The summing unit 101 sums up the amount of electricity measured by multiple watt-hour meters (second watt-hour meters) installed in multiple private areas (each dwelling unit) and common areas in the apartment building shown in Figure 4, and the measurement value calculation unit 102 calculates the amount of self-powered electricity by subtracting the amount of purchased electricity measured by the integrated watt-hour meter (first watt-hour meter 210) installed at the intake point from the sum. The settlement unit 103 uses the amount of self-powered electricity to settle the price to the power generation company.

[0036] With this configuration example, each resident can accurately grasp the amount of power generated from the distributed power source while maintaining their existing low-voltage power receiving contract with the power company.

[0037] In addition, integrated measurement and calculation allows for accurate understanding of the utilization rate of generated electricity and the amount of surplus electricity sold. This makes it possible to clearly indicate the amount of solar power generation consumed by households, regardless of whether it is in common or private areas, even in medium-sized residential buildings, promoting the effective use of generated electricity. Furthermore, this method does not involve the large initial investment and maintenance costs associated with the conventional "high-voltage bulk power receiving system," nor the operational constraints of appointing a chief electrical engineer, annual planned power outages, or the replacement of electricity meters in each unit. This allows residents to maintain the benefit of being able to freely choose their power company. On the other hand, with the high-voltage bulk power receiving system, electricity bills tend to be cheaper overall, as the energy charge is reduced despite an increase in the base rate. However, the effort and costs of installing and maintaining high-voltage power receiving equipment and appointing a chief electrical engineer increase. In contrast, with the low-voltage bulk power receiving system, although the base rate is slightly lower, the unit price of the energy charge often remains high, limiting the effect of reducing electricity bills. The present disclosure makes it possible to avoid these problems of conventional methods and accurately indicate the amount of self-powered solar power generation while maintaining existing individual low-voltage power receiving contracts.

[0038] Figure 5 is a system diagram showing a third example of a power system configuration for fairly and accurately calculating the amount of self-consumption electricity of distributed power sources in an apartment building while maintaining existing individual low-voltage power receiving contracts. The example in Figure 5 is applied to a large apartment building that encompasses multiple buildings or blocks (plots), and is a case where multiple buildings can be collectively used for self-consumption. Even in this case, each dwelling unit and common area maintains an individual low-voltage power receiving contract with the electric power company.

[0039] In this configuration example, distributed power sources are installed on the rooftops of buildings A and B, and their outputs are connected to the power distribution boards of each building via power conditioners. The power distribution boards are then connected to the main line used by the entire complex, supplying power from the distributed power sources to the common and private areas of each building.

[0040] At the point of connection with the electric power company, the first watt-hour meter 210 includes watt-hour meters for buying and selling electricity, making it possible to measure the power flow for multiple buildings all at once. The central watt-hour meter plays a role in measuring the amount of electricity bought and sold to the entire apartment building all at once, allowing for an integrated understanding of the amount of electricity consumed by the entire apartment building.

[0041] The high-voltage power drawn in is converted to low voltage by a transformer in the rented room electrical room, and then branched into wiring for multiple private areas and common areas by a service switchboard. The wiring for the common areas is connected to a common distribution board via a common meter (second watt-hour meter 220). From the common distribution board, wiring is distributed to loads in the common areas. Common area loads include lighting fixtures, elevators (ELVs), and pump equipment installed in hallways and staircases, for example. On the other hand, the wiring for the private areas branches out to each dwelling unit on, for example, the first to seventh floors, and connects to each unit's distribution board via a meter dedicated to each dwelling unit (second watt-hour meter 220). The secondary side of each unit's distribution board is wired to the household loads within the house. In addition, a lithium-ion battery (LiB) is connected between the first watt-hour meter 210 and the second watt-hour meter 220, and may be used to store surplus power from distributed power sources and for peak shaving.

[0042] The summing unit 101 sums up the amount of electricity measured by multiple watt-hour meters (second watt-hour meters 220) installed in multiple private areas (each dwelling unit) and common areas in the apartment building shown in Figure 5, and the measurement value calculation unit 102 calculates the amount of self-powered electricity by subtracting the amount of purchased electricity measured by the first watt-hour meter 210 installed at the intake point from the sum. The settlement unit 103 uses the amount of self-powered electricity to settle the price to the power generation company.

[0043] This configuration example allows power generated from distributed power sources to be supplied not only to private areas (each dwelling unit) but also to common area facilities as self-consumption power. This allows each resident to clearly indicate their self-consumption while maintaining their existing low-voltage power supply contract with the power company. This configuration example also offers many advantages over the conventional "high-voltage bulk power supply system." Even with high-voltage connection, there is no need to install high-voltage power receiving equipment (e.g., cubicles), replace electricity meters in each unit, or hire a chief electrical engineer. This eliminates the associated significant initial investment, maintenance costs, and operational constraints (e.g., annual planned power outages). Technical benefits include the ability to share power generated by distributed power sources across multiple buildings, absorbing imbalances in solar radiation conditions and demand balance, and maximizing the self-consumption rate of all buildings. Inter-building interconnection allows surplus power generated in one building to directly meet the demand of other buildings, reducing power sales losses and reverse power flow to the grid. Furthermore, when compared to the current maintenance and management of high-voltage substation equipment (cubicles, etc.) in rented electrical rooms, there are concerns not only about costs but also about increased risks due to the increased number of parts.

[0044] 6 is a system diagram showing a comparison between the current system and the centralized meter reading system of the present disclosure when purchasing electricity in photovoltaic power generation. The left side of the figure shows the current low-voltage individual contract system, and the right side shows an example of the configuration of the centralized meter reading system according to an embodiment of the present disclosure.

[0045] (1) Current method (low-voltage individual contract method) In the current system, in apartment buildings that have individual low-voltage power receiving contracts with electric power companies, electricity is stepped down from high-voltage service equipment via a transformer to low voltage and supplied to each dwelling unit and common area individually. In this case, the output from the distributed power source is connected to the grid via a power conditioner and measured by a power meter for the power purchase contract. Each dwelling unit is equipped with a dedicated demand power meter (second power meter 220) that measures the amount of power purchased under the individual contract. Although a common power meter is installed in the common area, it is independent of the dwelling unit measurements and does not perform comprehensive measurement of the entire facility. This configuration requires the installation and management of power purchase contract meters, and power data is also separated by unit and common area, making it difficult to directly grasp the facility's overall power shortage and self-consumption rate. As a result, even when power from distributed power sources is used in each unit, the existing power company meter measures that consumption as power purchased from the grid, resulting in the problem of residents being charged the regular electricity rate for the power they consumed themselves. As a result, power generation companies are unable to collect payment individually for the electricity consumed by each household, and the current situation is that the introduction of distributed power sources into apartment buildings has made little progress.

[0046] (2) This embodiment (comprehensive meter reading system) In this embodiment, a centralized electricity meter is installed at the high-voltage intake point, eliminating the need to install high-voltage power receiving equipment (cubicles, etc.), install or replace electricity meters in each household, appoint a chief electrical engineer, and have a planned power outage once a year, thereby eliminating the large initial investment, maintenance costs, and operational constraints associated with the conventional ``bulk power receiving method.''

[0047] According to this embodiment, the following effects can be obtained. (1) Centralized measurement: The energy flow of the entire facility can be grasped comprehensively using a centralized electricity meter, improving the accuracy of grasping the amount of electricity consumed by the facility and the amount of electricity purchased. (2) Reduction of equipment installation costs and contract costs: Conventionally, when selling electricity generated by distributed power sources, it was necessary to enter into an individual electricity sales contract for each dwelling unit and install a meter dedicated to the electricity sales contract. With this disclosure, these steps are no longer necessary, which reduces the costs of installing and managing measurement equipment. (3) Optimizing self-consumption: Energy management based on comprehensive data can increase self-consumption rates and reduce the amount of surplus electricity sold. (4) Benefits for all three parties (electric power companies, power generation companies, and residents): Residents can switch from their existing electric power company to another retail power company. However, switching contracts involves certain procedures and administrative burdens, and from the perspective of the administrator who installs the centralized watt-hour meter, the administrative burden can increase as the number of counterparties increases. Power generation companies can recover the cost of their own consumption fairly and accurately, making it easier to recover their investment. Meanwhile, electric power companies have little impact on the grid, so the introduction of solar power generation is promoted without anyone suffering any losses. In this way, when viewed from the perspective of all parties involved, the introduction of solar power generation can be promoted without anyone suffering any excessive disadvantages. (5) Ensuring fairness: Previously, solar power self-consumption was sometimes counted as electricity purchased from the grid, resulting in the problem of residents who actually consumed renewable energy being penalized by renewable energy surcharges and fuel adjustment fees. Furthermore, electricity sold under the FIT system was subject to renewable energy surcharges, placing an additional burden on the entire nation. This disclosure enables accurate measurement and settlement of self-consumption using a centralized watt-hour meter, allowing self-consumption to be properly classified and counted, thereby avoiding these unfairness and disadvantages and ensuring that power generation companies are paid the correct price.

[0048] 7 is a system diagram showing a comparison between the current system and the centralized meter reading system of the present disclosure when selling surplus electricity from solar power generation. The left side of the figure shows the current low-voltage individual contract system, and the right side shows an example of the configuration of the centralized meter reading system according to the embodiment of the present disclosure.

[0049] (1) Current method (low-voltage individual contract method) In the current system, in apartment buildings where individual low-voltage power receiving contracts are concluded with electric power companies, electricity is stepped down from high-voltage service equipment via a transformer to low voltage and supplied to each unit and common area. In this case, the output from the distributed power source passes through a power conditioner and is then reverse-flowed to the grid via a power meter for the power purchase contract. Individual demand watt-hour meters (second watt-hour meters 220) are installed in each unit's private area and common area to measure the amount of power consumed. However, comprehensive measurement of the amount of power sold for the entire facility is not performed, so a power meter for the power purchase contract is required. Furthermore, with this configuration, power sales measurement is separated by individual contract, making it impossible to grasp the amount of power generated and sold for the entire facility at a glance, and the installation and maintenance costs of the measuring equipment are high. Furthermore, the existing issue of each unit being charged for the amount of power consumed by itself hinders appropriate energy management even when selling surplus electricity, making it difficult for power generation companies to recover their investments. Comparing the current configuration shown on the left side of Figure 6 with the current configuration shown on the left side of Figure 7, both show issues with the current system, but the left side of Figure 7 shows a schematic diagram of a state in which a centralized power meter has not been introduced, making it impossible to obtain an integrated understanding of the electricity sales or purchases of the entire facility.

[0050] (2) This embodiment (comprehensive meter reading system) In this embodiment, a centralized watt-hour meter is installed at the high-voltage service point, and the amount of power sold throughout the entire facility is measured as a negative value. The amount of power generated and sold is calculated by calculating the difference between the value measured by the centralized watt-hour meter and the total amount of power measured by the watt-hour meters managed by the electric power company in each private and common area. Specifically, the following relationship holds: solar power generation (pvWh) = total power demand (ΣWh) + power sold. While the current method shown in Figure 6 requires the installation of separate meters for power sales contracts based on individual unit contracts, the disclosed method shown in Figure 7 treats purchased power as zero while power sales are occurring as measured by the centralized watt-hour meter, visualizing the state in which the entire apartment complex is powered solely by solar power generation. Furthermore, if surplus power is generated, it is accurately measured as power sold, making it possible to centrally grasp the amount of power generated, sold, and self-consumption, compared to conventional methods. Therefore, the power generation meters for selling electricity, which were previously required by power generation companies, are no longer necessary, reducing the number of measuring devices that need to be installed. Since the demand electricity meters for each unit and common area remain the same, it is possible to manage electricity usage for each tenant in the same way as with the conventional method. Furthermore, by adopting the centralized meter reading method disclosed herein, there is no need to install high-voltage power receiving equipment (such as cubicles), appoint a chief electrical engineer, or hold planned power outages once a year, eliminating the significant initial investment, maintenance costs, and operational constraints compared to the conventional "bulk power receiving method."

[0051] According to this embodiment, the following effects can be further obtained. (1) Centralized measurement: The integrated electricity meter allows for a comprehensive understanding of the facility's overall electricity consumption, including the amount of electricity sold, which simplifies data collection and improves the accuracy of understanding the amount of electricity consumed by the facility and the amount of electricity sold. (2) Reduction of equipment installation costs and contract costs: Not only is there no need for a power sales contract meter, but there is also no need to install a cubicle or appoint a chief electrical engineer, which is required for a high-voltage power receiving contract, so the installation, maintenance, and operation costs of measuring equipment are significantly reduced. Reducing the number of electrical devices also increases safety. (3) Energy management optimization: Based on integrated data on power generation, consumption, and sales, it becomes possible to improve self-consumption rates and maximize revenue from sales of electricity. (4) Benefits for all three parties (electric power companies, power generation companies, and residents): The large-scale introduction of solar power generation will be promoted without causing any disadvantage to any of the three parties. Residents will be able to resolve the issue of being billed for electricity they consume themselves, power generation companies will receive a fair price, and electric power companies will welcome the spread of self-consumption, which has less impact on the grid. Furthermore, this disclosure will make it possible to clearly indicate the proportion of electricity consumed by the entire apartment complex that comes from renewable energy sources. However, to accurately measure the renewable energy consumption of each household, a separate measurement method with a time resolution of, for example, 30 minutes will be required.

[0052] Figure 8 is a system diagram that shows a schematic diagram of the relationship between self-consumption, power purchase, and power sale in this embodiment. Currently, each dwelling unit in an apartment building has an individual low-voltage power receiving contract with an electric power company, making it difficult to fairly and accurately measure the amount of self-consumption power when power generated by a distributed power source is self-consumed by the entire apartment building. This creates a problem in that residents are charged the regular rate even for power they self-consumed, and as a result, the introduction of distributed power sources into apartment buildings has made little progress.

[0053] In the centralized meter reading method disclosed herein, the power flow throughout the entire facility can be grasped in a unified manner based on changes in the positive and negative measurement values ​​of the centralized electricity meter.

[0054] (1) Self-consumption priority / power purchase supplement status The state shown in the upper part of Figure 8 shows a situation where all the electricity generated by a distributed power source (for example, solar panels + PCS) is consumed internally to meet the demand of the entire facility (private areas + common areas). Because the amount of electricity generated falls short of demand, the shortfall is made up by purchasing electricity from the high-voltage service point. In this case, the value of the centralized watt-hour meter is as follows: TW + (Positive measurement value of the central power meter)>0: This is the measurement value that indicates the amount of electricity received from the grid to the facility (amount of electricity purchased). TW -(Negative measurement value of the central watt-hour meter) = 0: There is no reverse power flow (power sales) to the grid. This means that "in addition to 100% self-consumption, the shortfall is supplied from the grid," and no power sales are occurring. In this state, the amount of solar power generation (pvWh) is equal to the amount of self-consumption, and this value is calculated by subtracting the total amount of power demand (ΣWh) from the power purchase measurement value (TWh) of the central watt-hour meter. + ) is calculated by subtracting

[0055] (2) Surplus electricity sales status The state shown in the lower part of Fig. 8 shows a situation where surplus power is generated when the amount of power generated by the photovoltaic power generation facility exceeds the demand of the facility, and the power flows back to the grid and is sold. TW + (Positive measurement value of the central watt-hour meter) = 0: No power is being received (purchased) from the grid. TW - (Negative measurement value of the central watt-hour meter) > 0: This is the measurement value that indicates the amount of reverse power flow (amount of power sold) to the grid. This means that "all the demand of the facility is covered and the surplus is sold," and no power is purchased. In this state, the amount of solar power generation (pvWh) is the sum of the total demand (ΣWh) and the measurement value of the central watt-hour meter for power sold (TWh - ) is calculated as the sum of

[0056] FIG. 9 is a flowchart illustrating the operation of the power supply system of the present disclosure. In step S1, the power supply system measures the amount of power purchased from the power company to the apartment building using a first watt-hour meter installed at the power draw point for the entire apartment building. In step S2, the power supply system measures the amount of power in each of the multiple dedicated and common areas using second watt-hour meters installed in each of the multiple dedicated and common areas. In step S3, the power supply system adds up the measured values ​​of the multiple second watt-hour meters to calculate the total amount of power consumption in all of the dedicated and common areas. In step S4, the power supply system calculates the amount of self-power consumption from the distributed power source by subtracting the amount of power purchased measured by the first watt-hour meter from the total amount. In step S5, the power supply system reimburses the power generation company of the distributed power source for the amount of self-power consumption based on the calculated amount of self-power consumption.

[0057] The integrated meter reading system of the present disclosure can also be applied to cases where a high-voltage collective power receiving system is adopted.

[0058] These characteristic configurations will be described below with more specific examples.

[0059] (First configuration example) A power supply system according to a first configuration example of the present disclosure is a power supply system for a condominium that includes multiple private and common areas, each of which has a low-voltage power receiving contract with a power company. The system includes a first watt-hour meter installed at the power intake point for the entire condominium and that measures the amount of power purchased from the power company. The system also includes an adder unit that adds up the amount of power measured by second watt-hour meters installed in each of the private and common areas and managed by the power company; a measurement value calculation unit that calculates the amount of self-consumption power from distributed power sources in the condominium by subtracting the amount of purchased power from the added-up amount of power; and an accounting unit that adjusts the compensation for the self-consumption power to the power generation company of the distributed power source based on the calculated amount of self-consumption power. This system is configured by an information processing device 100 that realizes the functions of an adder unit 101, a measurement value calculation unit 102, an accounting unit 103, and the like, and processes the power amount data from each watt-hour meter.

[0060] This configuration allows for the easy introduction of distributed power sources into apartment buildings while maintaining existing low-voltage individual power supply contracts. In particular, it enables fair and accurate measurement of the self-consumption of electricity generated by distributed power sources when the entire apartment building consumes the electricity generated by the distributed power sources. This eliminates the traditional issue of residents being charged regular (or grid) electricity rates for their own consumption, allowing power generation companies to fairly recover the cost of the electricity consumed by the entire apartment building. Furthermore, it eliminates the significant initial investment, maintenance costs, and operational constraints (such as the need for a chief electrical engineer and annual planned power outages) associated with the traditional "bulk power supply" system. Furthermore, each resident can freely choose their retail power supplier, as before, allowing them to make eco-conscious choices, such as choosing a power source with a low environmental impact or a plan with a high renewable energy ratio. This system benefits all three parties—electricity companies, power generation companies, and residents—and promotes the adoption of solar power generation without any disadvantages.

[0061] (Second configuration example) The power supply system according to the second configuration example of the present disclosure includes the power supply system shown in the first configuration example, and further includes a second watt-hour meter installed in each of a plurality of private or common areas where each private or common area has individually concluded a low-voltage power receiving contract with an electric power company. In apartment buildings, it is common for each dwelling unit (private area) and common area to individually conclude a low-voltage power receiving contract with an electric power company. The second watt-hour meter 220 is installed in each of these private or common areas and measures the amount of power consumed by each dwelling unit individually.

[0062] With this configuration, each resident can enjoy the benefits of self-consumption of solar power generation while maintaining their existing low-voltage power receiving contract with the power company. This maintains the advantage of residents being able to freely choose their power company. This feature is a crucial difference from the conventional high-voltage bulk power receiving system, and will greatly promote the spread of solar power generation in apartment buildings.

[0063] (Third configuration example) The power supply system according to the third configuration example of the present disclosure includes the same components as those in the first configuration example, but with a first watt-hour meter installed on the primary side of a pad-mounted transformer that transforms high-voltage power from the power company to low voltage at the power draw point for the entire apartment building. This configuration is shown in Fig. 4 and is applicable to cases where high-voltage power is drawn into a medium-sized residential building.

[0064] With this configuration, even in medium-sized residential buildings, it is possible to self-consumer solar power generation in both common and private areas, promoting the effective use of generated electricity. Furthermore, this method does not involve the operational constraints of the conventional "high-voltage bulk power receiving method," such as the large initial investment and maintenance costs, the appointment of a chief electrical engineer, and annual planned power outages, so residents can still enjoy the benefit of being able to freely choose their power company.

[0065] (Fourth configuration example) In a power supply system according to a fourth configuration example of the present disclosure, in addition to the power supply system shown in the first configuration example, a first watt-hour meter is installed on the primary side of a transformer in an electrical room located on the premises of the apartment building at the power draw point for the entire apartment building. This configuration, shown in Fig. 5, is applicable to large apartment buildings encompassing multiple buildings or blocks, allowing for self-consumption across multiple buildings.

[0066] With this configuration, even with high-voltage lead-in, there is no need to install high-voltage power receiving equipment (such as cubicles) or appoint a chief electrical engineer, as was necessary with the conventional "high-voltage bulk power receiving method," eliminating the significant initial investment, maintenance costs, and operational constraints that come with it. Furthermore, because the power obtained from distributed power sources in multiple buildings can be shared, imbalances in solar radiation conditions and demand balance can be absorbed, maximizing the self-consumption rate of all buildings. Inter-building interconnection allows surplus power generated in one building to be directly applied to the demand of other buildings, reducing power sales losses and reverse power flow to the grid.

[0067] (Fifth configuration example) In a power supply system according to a fifth configuration example of the present disclosure, in addition to the power supply system shown in the first configuration example, a first watt-hour meter is installed at a main high-voltage power intake point before the power supply to each building or block branches off in an apartment building that includes multiple buildings or blocks. This first watt-hour meter functions as an integrated watt-hour meter that includes watt-hour meters for purchasing and selling electricity, and can collectively measure the power flow for multiple buildings.

[0068] This configuration, like the fourth configuration example, makes it possible to efficiently achieve self-consumption of solar power generation in large apartment buildings spanning multiple buildings. By installing a central watt-hour meter at the main high-voltage power intake point, it becomes possible to grasp the self-consumption amount of multiple buildings as a whole in an integrated manner, rather than on an individual building basis, and to optimize energy management of the entire system.

[0069] (Sixth configuration example) A power supply system according to a sixth configuration example of the present disclosure includes the same components as those in the first configuration example, but with a first watt-hour meter installed at the power draw point for the entire apartment building, where low-voltage power is drawn directly from the power company without going through a transformer from high voltage. This configuration is shown in Fig. 3 and is applicable to cases where low-voltage power is drawn directly from the power company to a small residential building.

[0070] This configuration allows even small residential buildings to self-consume solar power, regardless of whether it is in common or private areas, promoting the effective use of generated electricity. It also maintains the benefits of not having the large initial investment, maintenance costs, or operational constraints associated with the conventional "high-voltage bulk power receiving system," while allowing residents to freely choose their power company.

[0071] (7th configuration example) A power supply system according to a seventh configuration example of the present disclosure includes, in addition to the power supply system shown in the first configuration example, a distributed power source installed on the roof of the apartment building, on a wall of the apartment building, or on the grounds surrounding the apartment building. Although the roofs, walls, and surrounding grounds of apartment buildings are well exposed to sunlight, there is currently a problem in that little progress has been made in introducing distributed power sources.

[0072] This configuration has the effect of maximizing the use of unused space, such as rooftops of apartment buildings, and accelerating the introduction of distributed power sources. This is because the mechanism disclosed herein enables fair and accurate measurement of the amount of self-consumption of rooftop solar power generation, which was difficult with existing power supply systems.

[0073] (8th configuration example) In the power supply system according to the eighth configuration example of the present disclosure, in addition to the power supply system shown in the first configuration example, the first watt-hour meter is a certified watt-hour meter.

[0074] This configuration enables highly reliable measurements using only certified meters to calculate private power consumption, ensuring fairness and accuracy of measurements. This builds trust between power generation companies, power companies, and residents, and serves as the foundation for widespread social acceptance of this system.

[0075] (9th configuration example) A watt-hour meter according to a ninth configuration example of the present disclosure is installed at the power intake point for an entire apartment building that includes multiple private and common areas, each of which has a low-voltage power receiving contract with an electric power company. This watt-hour meter measures the amount of power purchased from the electric power company, and is used to calculate the amount of power consumed by the apartment building itself from distributed power sources by subtracting this amount of power purchased from the total amount of power measured by the watt-hour meters installed in each of the multiple private and common areas and managed by the electric power company. This watt-hour meter is referred to as the central watt-hour meter (first watt-hour meter 210).

[0076] This energy meter allows for a unified understanding of the power flow throughout the entire facility at the power draw point for the entire apartment complex, and provides basic measurements for a fair and accurate calculation of the amount of self-consumption of solar power. This allows for the appropriate evaluation and settlement of self-consumption amounts, which was difficult with the conventional individual contract system, and also contributes to the simplification of equipment configuration.

[0077] (10th Configuration Example) An information processing device according to a tenth configuration example of the present disclosure includes at least one processor. The processor is installed in multiple private and common areas that have individual low-voltage power receiving contracts with an electric power company. The processor sums up the amount of power measured by watt-hour meters managed by the electric power company, and calculates the amount of self-consumption power from the distributed power source in the apartment building by subtracting from the summed amount of power the amount of power purchased from the electric power company measured by watt-hour meters installed at the power draw point for the entire apartment building that includes the multiple private and common areas. Furthermore, based on the calculated amount of self-consumption power, the processor settles compensation for the amount of self-consumption power to the power generation company of the distributed power source. This information processing device is realized by a server or the like installed in the electric power company.

[0078] This information processing device automates the aggregation, calculation, and settlement of complex power data, enabling fair and accurate calculation of the amount of self-consumption and settlement of the cost. This makes it easier for power generation companies to recover their investments and accelerates the introduction of distributed power sources to apartment buildings. In addition, integrated data processing optimizes energy management, contributing to improving self-consumption rates and maximizing revenue from selling electricity.

[0079] In the above embodiments, the processes executed by the CPU after reading the software (program) may be executed by various processors other than the CPU. Examples of such processors include programmable logic devices (PLDs) such as field-programmable gate arrays (FPGAs), whose circuit configuration can be changed after fabrication, and dedicated electrical circuits such as application-specific integrated circuits (ASICs), which are processors with circuit configurations specifically designed to execute specific processes. Each process may be executed by one of these processors, or by a combination of two or more processors of the same or different types (e.g., multiple FPGAs, or a combination of a CPU and an FPGA). The hardware structure of these processors is, more specifically, an electrical circuit that combines circuit elements such as semiconductor devices.

[0080] In the above embodiment, the programs are pre-stored (installed) in a storage device, but the present invention is not limited to this. The programs may be provided in a form stored on a storage medium such as a CD-ROM, DVD-ROM, Blu-ray disc, or USB memory. The programs may also be downloaded from an external device via a network.

[0081] (Addendum) The following additional notes are provided regarding aspects of the present disclosure. (Supplementary Note 1) An electricity supply system for a condominium that includes multiple private and common areas that have individual low-voltage power receiving contracts with an electric power company, the electricity supply system comprising: a first electricity meter installed at the power draw point for the entire condominium and that measures the amount of electricity purchased from the electric power company; an addition unit that adds up the amount of electricity measured by second electricity meters installed in each of the multiple private and common areas and managed by the electric power company; a measurement value calculation unit that calculates the amount of self-consumption electricity from distributed power sources in the condominium by subtracting the amount of electricity purchased from the added-up value of the amount of electricity; and an adjustment unit that adjusts the compensation for the amount of self-consumption electricity to the power generation company of the distributed power source based on the calculated amount of self-consumption electricity. (Appendix 2) The power supply system described in Appendix 1, wherein the second electricity meter is a meter installed by a plurality of the dedicated units or the common units individually entering into low-voltage power receiving contracts with the electric power company. (Appendix 3) The power supply system described in Appendix 1 or Appendix 2, wherein the first electricity meter is installed on the primary side of a pad-mounted transformer that transforms high-voltage power from the electric power company to low voltage at the power draw point for the entire apartment building. (Appendix 4) A power supply system described in any one of Appendices 1 to 3, wherein the first electricity meter is installed on the primary side of a transformer in an electrical room located on the premises of the apartment building at the power draw point to the entire apartment building. (Appendix 5) The power supply system according to any one of Appendices 1 to 4, wherein the first electricity meter is installed at the main high-voltage power intake point before the power supply to each building or block branches off in the apartment complex which includes multiple buildings or blocks. (Appendix 6) A power supply system as described in any one of Appendices 1 to 5, wherein the first watt-hour meter is installed at the power draw point for the entire apartment building, where power is drawn directly from the electric power company at low voltage without going through a transformer from high voltage. (Appendix 7) A power supply system according to any one of Appendices 1 to 6, wherein the distributed power source is located on the roof of the apartment building, on a wall of the apartment building, or on the grounds surrounding the apartment building. (Supplementary Note 8) The power supply system according to any one of Supplementary Notes 1 to 7, wherein the first watt-hour meter is a certified watt-hour meter. (Appendix 9) An electricity meter that is installed at the power intake point for an entire apartment complex that includes multiple private and common areas that have individual low-voltage power receiving contracts with an electric power company, measures the amount of electricity purchased from the electric power company, and is used to calculate the amount of electricity consumed by the apartment complex itself from distributed power sources by subtracting the amount of electricity purchased from the total amount of electricity measured by electricity meters installed in each of the multiple private and common areas and managed by the electric power company. (Supplementary Note 10) An information processing device comprising at least one processor that adds up the amount of electricity measured by electricity meters installed in multiple private and common areas that have individual low-voltage power receiving contracts with an electric power company and are managed by the electric power company, calculates the amount of electricity consumed by distributed power sources in the apartment building by subtracting from the total amount of electricity the amount of electricity purchased from the electric power company measured by electricity meters installed at the power draw point for the entire apartment building, and settles compensation for the amount of electricity consumed by the distributed power source to the power generation company based on the calculated amount of electricity consumed.

[0082] All publications, patent applications, and technical standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference. [Explanation of symbols]

[0083] 1 CPU, 2 input / output interface, 3 R / W unit, 4 network interface, 5 storage unit, 5a program, 6 memory, 7 system bus, 10 electric power company, 20 apartment building, 30 network, 40 power generation company, 41 distributed power source, 100 information processing device, 101 summing unit, 102 measurement value calculation unit, 103 settlement unit, 210 first watt-hour meter, 220 second watt-hour meter, 1000 power supply system

Claims

1. A power supply system for a multi-family home that includes multiple private and common areas and that has individual low-voltage power receiving contracts with electric power companies, a first watt-hour meter installed at a power draw point for the entire apartment building and measuring the amount of power purchased from the power company; an accumulator that sums up the amounts of electric power measured by second watt-hour meters that are installed in each of the plurality of dedicated areas and the plurality of common areas and that are managed by the electric power company; a measurement value calculation unit that calculates the amount of self-powered consumption from the distributed power sources in the apartment building by subtracting the amount of purchased power from the total amount of power; a settlement unit that settles a price for the self-consumption amount to the power generation company of the distributed power source based on the calculated self-consumption amount; A power supply system comprising:

2. The power supply system according to claim 1 , wherein the second watt-hour meter is a meter installed by a plurality of the dedicated units or the common units individually concluding low-voltage power receiving contracts with the electric power company.

3. 2. The power supply system of claim 1, wherein the first watt-hour meter is installed on the primary side of a pad-mounted transformer that transforms high-voltage power from the power company to low voltage at a power draw point for the entire apartment building.

4. 2. The power supply system according to claim 1, wherein the first watt-hour meter is installed on the primary side of a transformer in an electrical room located on the premises of the apartment building at a power draw point for the entire apartment building.

5. 2. The power supply system according to claim 1, wherein the first watt-hour meter is installed at a main high-voltage power intake point before power supply to each building or block branches off in the apartment building that includes multiple buildings or blocks.

6. 2. The power supply system according to claim 1, wherein the first watt-hour meter is installed at a power intake point for the entire apartment building, where power is drawn directly from the power company at low voltage without passing through a transformer from high voltage.

7. The power supply system according to claim 1 , wherein the distributed power sources are installed on a roof of the apartment building, on a wall of the apartment building, or on a site surrounding the apartment building.

8. The power supply system according to claim 1 , wherein the first watt-hour meter is a certified watt-hour meter.

9. at least one processor; The processor: Installed in multiple private and shared areas that have individually concluded low-voltage power receiving contracts with electric power companies, The amount of electricity measured by the electricity meter managed by the electric power company is added up, calculating the amount of self-consumption electricity from the distributed power sources in the apartment building by subtracting the amount of electricity purchased from the electric power company measured by an electricity meter installed at a power intake point for the entire apartment building including the multiple private areas and the common areas from the total amount of electricity; Based on the calculated amount of self-consumption electricity, a compensation for the amount of self-consumption electricity is paid to the power generation company of the distributed power source. Information processing device.

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