Power management system, power management method, and program

Abstract

A power management system comprises: a first acquisition unit (31) for acquiring a generated power value of distributed power sources (41); a second acquisition unit (31) for acquiring a purchased power value from a power grid (46); a third acquisition unit (31) for acquiring a first charging power value (EV_C) for an electric vehicle (44); and a calculation unit (32). The calculation unit (32): calculates a power-generation-derived first CO2 emission amount on the basis of a power-generation-derived second charging power value (PVtoEV), which is the smaller of a power value based on the generated power value and the first charging power value, and a first CO2 emission factor corresponding to the generated power; calculates a grid-derived second CO2 emission amount on the basis of a grid-derived third charging power value (CPtoEV), which is obtained by subtracting the power-generation-derived second charging power value from the first charging power value, and a second CO2 emission factor corresponding to the purchased power; and calculates the CO2 emission amount of the electric vehicle on the basis of the power-generation-derived first CO2 emission amount and the grid-derived second CO2 emission amount.

Description

Power management system, power management method and program

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

[0002] In recent years, the number of homes equipped with solar cells has been increasing. In such homes, the power generated by the solar cells is used to charge storage batteries of electric vehicles, etc. For example, Patent Document 1 discloses a power supply control device that charges a storage battery mounted on an automobile with power generated by solar cells.

[0003] JP 2010-268576 A

[0004] By the way, electricity generated by non-fossil energy such as solar cell power (i.e., CO ２ It may be difficult to charge the batteries of electric vehicles using only electricity generated by fossil fuels such as grid power (i.e., electricity generated by a method that does not emit CO2). ２ In such cases, the CO2 generated when generating the charging power that is charged into the battery of the electric vehicle may be used. ２ Controlling emissions is being considered.

[0005] However, it is difficult to control which power is being used to charge the storage battery of the electric vehicle (the source of the charging power), and it is difficult to control the CO generated when generating the charging power that is charged into the storage battery of the electric vehicle. ２ Emissions are difficult to control.

[0006] Therefore, the present invention aims to reduce the CO generated when generating charging power for charging the storage battery of an electric vehicle. ２ An electric power management system, an electric power management method, and a program are provided that can more appropriately manage emissions.

[0007] An energy management system according to one aspect of the present invention is an energy management system that manages the energy of an electric vehicle and a distributed power source, the distributed power source, the electric vehicle, and a power grid being electrically connected to each other, and the energy management system includes a first acquisition unit that acquires a generated energy value of the distributed power source, a second acquisition unit that acquires a purchased energy value from the power grid, a third acquisition unit that acquires a first charging energy value for the electric vehicle, and a calculation unit, and calculates different CO ２ an emission coefficient is set, and the calculation unit calculates a second charging power value derived from power generation, which is a smaller power value of a power value based on the generated power value and the first charging power value, and a first CO ２ Based on the emission factor, the first CO ２ a third charging power value derived from the grid, which is a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value; and a second CO ２ Based on the emission factor, the second CO ２ Calculate the amount of CO2 emitted from power generation. ２ Emissions and the second CO ２ CO emissions of the electric vehicle based on ２ Calculate emissions.

[0008] A power management method according to one aspect of the present invention is a power management method executed by a power management system that manages the power of an electric vehicle and a distributed power source, the method comprising: electrically connecting the distributed power source, the electric vehicle, and a power grid; acquiring a generated power value of the distributed power source; acquiring a purchased power value from the power grid; acquiring a first charging power value for the electric vehicle; and calculating different CO ２ a second charging power value derived from power generation, which is a smaller power value of a power value based on the generated power value and the first charging power value; and a first CO emission coefficient corresponding to the generated power. ２ Based on the emission factor, the first CO ２a third charging power value derived from the grid, which is a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value; and a second CO ２ Based on the emission factor, the second CO ２ Calculate the amount of CO2 emitted from power generation. ２ Emissions and the second CO ２ CO emissions of the electric vehicle based on ２ Calculate emissions.

[0009] A program according to one aspect of the present invention is a program for causing a computer to execute the above-described power management method.

[0010] According to one aspect of the present invention, CO generated when generating charging power to charge a storage battery of an electric vehicle is ２ It is possible to realize an electric power management system or the like that can more appropriately manage emissions.

[0011] FIG. 1 is a diagram showing the configuration of a power management system according to an embodiment. FIG. 2 is a block diagram showing the functional configuration of a management device according to an embodiment. FIG. 3 is a diagram for explaining each power value according to an embodiment. FIG. 4 is a flowchart showing the operation of the power management system according to an embodiment. FIG. 5 is a diagram showing a modified example of a power calculation method in the power management system according to an embodiment. FIG. 6 is a diagram showing CO2 calculation of an electric vehicle and a house in the power management system according to an embodiment. ２ Fig. 7 is a diagram illustrating an example of a method for counting an amount of emitted energy. Fig. 7 is a diagram illustrating a configuration of a power management system according to a modified example of the embodiment.

[0012] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0013] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, components, component placement and connection configurations, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not described in the independent claims are described as optional components.

[0014] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0015] Furthermore, in this specification, terms indicating relationships between elements such as "same," as well as numerical values ​​and numerical ranges, are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about several percent (or about 10%).

[0016] Furthermore, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components unless otherwise specified, but are used for the purpose of avoiding confusion and distinguishing between components of the same type.

[0017] (Embodiment) Hereinafter, a power management system according to the present embodiment will be described with reference to Figs.

[0018] [1. Configuration of the Power Management System] First, the configuration of the power management system according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing the configuration of the power management system according to this embodiment.

[0019] As shown in Fig. 1 , the power management system is a system that manages the power of an electric vehicle 44 ("EV" in Fig. 1 ) and a solar cell 41 ("PV" in Fig. 1 ), and includes a specific metering panel 10, the solar cell 41, a power conversion system 42 ("PCS" in Fig. 1 ), a vehicle charger 43, an electric vehicle 44 equipped with a storage battery, a power meter 45, a power grid 46, and a power load 47. The solar cell 41, the electric vehicle 44, the power grid 46, and the power load 47 are electrically connected to each other.

[0020] The specified meter panel 10 is connected to a power load 47 such as a home appliance (for example, a distribution board (not shown) connected to the power load 47), a power meter 45 connected between a power grid 46 and a house, a power conversion system 42, and a charger 43. In this embodiment, the specified meter panel 10 includes terminals 11-14, power sensors 21-24 which are specified meters, and a management device 30. The specified meter panel 10 is a box that houses the power sensors 21-24 and the management device 30.

[0021] The specified meter panel 10 is configured to be able to supply the power generated by the solar cell 41 to the electric vehicle 44, the power grid 46, and the power load 47. The specified meter panel 10 is also configured to be able to supply the power purchased from the power grid 46 to the electric vehicle 44 and the power load 47. The specified meter panel 10 is also configured to be able to supply the power discharged by the electric vehicle 44 to the power grid 46 and the power load 47. If the house is equipped with a power storage device, the specified meter panel 10 may be configured to be able to supply at least one of the power generated by the solar cell 41, the power purchased from the power grid 46, and the power discharged by the electric vehicle 44 to the power storage device.

[0022] The specific meter panel 10 is placed, for example, in a residence. A residence is an example of a facility. A facility may be a residential facility or a non-residential facility. Examples of residential facilities are a detached house and an apartment building. Each of the multiple dwelling units in an apartment building may be considered a "facility," or the entire apartment building may be considered a "facility." Examples of non-residential facilities include stores, office buildings, schools, welfare facilities, commercial complexes, hospitals, factories, etc.

[0023] The terminal 11 is a connection terminal for connecting the specific metering panel 10 (for example, the power sensor 21) and the power conversion system 42 via a power line or the like.

[0024] The terminal 12 is a connection terminal for connecting the specific meter panel 10 (e.g., the power sensor 22) and the charger 43 via a power line or the like.

[0025] The terminal 13 is a connection terminal for connecting the specific meter panel 10 (for example, the power sensor 23) and the power meter 45 via a power line or the like.

[0026] The terminal 14 is a connection terminal for connecting the specific metering panel 10 (for example, the power sensor 24) to a distribution panel to which the power load 47 is connected via a power line or the like.

[0027] The power sensor 21 is a sensor capable of measuring the power generated by the solar cell 41 and output by the power conversion system 42 (the AC power converted from the DC power generated by the solar cell 41 by the power conversion system 42). The power sensor 21 is connected between the terminal 11 and each of the power sensors 22 to 24. The power sensor 21 is an example of a first measuring instrument.

[0028] The power sensor 22 is a sensor that can measure the power (charging power to the electric vehicle 44) from at least one of the solar cell 41 and the power grid 46, and the discharge power from the electric vehicle 44. The power sensor 22 measures the power from the solar cell 41 and the power grid 46 without distinguishing between them. The power sensor 22 is connected between the terminal 12 and each of the power sensors 21, 23, and 24. The power sensor 22 is an example of a second measuring instrument.

[0029] The power sensor 23 is a sensor that can measure both the power purchased from the power grid 46 and the power sold to the power grid 46. The power sensor 23 is connected between the terminal 13 and each of the power sensors 21, 22, and 24. The power sensor 23 is an example of a third measuring instrument.

[0030] The power sensor 24 is a sensor capable of measuring the power supplied to the power load 47 from at least one of the solar cell 41, the electric vehicle 44, and the power grid 46. The power sensor 24 measures the power from the solar cell 41, the electric vehicle 44, and the power grid 46 without distinguishing between them. The power sensor 24 is connected between the terminal 14 and each of the power sensors 21 to 23. The power sensor 24 is an example of a fourth measuring instrument.

[0031] 1, power is supplied to the management device 30 via a power line common to the power load 47 within the specific metering panel 10. In other words, the power sensor 24 measures the total power supplied to the power load 47 and the power supplied to the management device 30. Note that the method of supplying power to the management device 30 is not limited to this.

[0032] The power values ​​measured by the power sensors 21 to 24 are output to the management device 30. That is, the management device 30 can acquire the power values ​​measured by the power sensors 21 to 24.

[0033] The number of power sensors built into the specific metering panel 10 is not limited to four, and may be three. For example, it is sufficient if three of the power sensors 21 to 24 are built into the specific metering panel 10. Using the power values ​​of the three power sensors and Kirchhoff's law, it is possible to calculate the power value of the omitted power sensor.

[0034] The management device 30 measures carbon dioxide (CO ２ ) is not emitted, but when charging from a grid power source, CO ２ Focusing on the fact that the electric vehicle 44 uses electricity generated by emitting CO ２ electricity generated using fossil fuels (i.e., no CO ２ For example, when the electric vehicle 44 is charged with electricity generated using non-fossil energy (hereinafter also referred to as non-fossil power), the management device 30 calculates the amount of charge using non-fossil power, and when the electric vehicle 44 is charged with electricity generated using fossil energy (hereinafter also referred to as fossil power), the management device 30 calculates the amount of charge using fossil power separately from the amount of charge using non-fossil power.

[0035] In this way, the management device 30 counts the amount of non-fossil electricity charged in the storage battery, and calculates the amount of non-fossil electricity and the amount of fossil electricity (i.e., CO ２ The management device 30 executes a process for calculating the CO emissions indirectly generated by the electric vehicle 44 and / or the house. ２ It can also be said that processing for calculating emissions is performed.

[0036] In this specification, CO ２The emissions are CO generated when generating electricity used for charging the electric vehicle 44 and / or consumption in the home. ２ Also, CO ２ If the electric vehicle 44 is a hybrid vehicle or the like, the CO emissions may be calculated by adding ２ It may include CO emissions, ２ It does not have to include emissions.

[0037] FIG. 2 is a block diagram showing the functional configuration of the management device 30 according to this embodiment.

[0038] 2 , the management device 30 includes, as its functional configuration, a communication unit 31 and a calculation unit 32. The management device 30 also includes, as its hardware configuration, a non-volatile memory in which a program is stored, a volatile memory that is a temporary storage area for executing the program, an input / output port, a communication interface, a processor that executes the program, and the like. The memory is, for example, a read-only memory (ROM) or a random access memory (RAM), and can store the program to be executed by the processor. The communication unit 31 and the calculation unit 32 are realized by, for example, a processor that executes the program stored in the memory.

[0039] The communication unit 31 is a communication device that enables the management device 30 to communicate with the power sensors 21 to 24 and the server. The communication unit 31 includes, for example, a communication circuit (communication module). The communication method of the communication unit 31 is not particularly limited, and may be wireless communication or wired communication.

[0040] The server receives the CO ２ It may also have a function for managing emissions.

[0041] The calculation unit 32 calculates a CO2 equivalent value according to the amount of non-fossil electricity used (amount of charge, amount of consumption) in at least one of the house and the electric vehicle 44 (for example, both the house and the electric vehicle 44) based on the power values ​​of the power sensors 21 to 24. ２ As will be described in detail later, the calculation unit 32 calculates the amount of CO ２The amount of CO emissions is added up, and the amount of CO emissions is calculated for the non-fossil fuel electricity generated by the solar cell 41. ２ Maintain emissions (i.e., CO ２ (The amount of CO2 discharged does not increase or decrease.) ２ Subtract emissions.

[0042] Here, taking the power sensor 22 as an example, the charging power measured by the power sensor 22 may be a mixture of power generated by the solar cell 41 and power purchased from the power grid 46, but it is difficult to separate them. Therefore, the calculation unit 32 performs calculations by separating them based on a predetermined calculation method. It can also be said that the calculation unit 32 estimates the power generated by the solar cell 41 and the power purchased from the power grid 46 based on the predetermined calculation method.

[0043] For example, the calculation unit 32 assumes that the generated power is used preferentially for charging the electric vehicle 44 out of charging the electric vehicle 44 and consumption of the electrical equipment (using an EV priority calculation method described later), estimates the generated power from the solar cell 41 and the power purchased from the power grid 46, and calculates the first CO 2 derived from the power generation. ２ Emissions and grid-derived secondary CO ２ The calculation unit 32 may also estimate the amount of power generated by the solar cell 41 and the amount of power purchased from the power grid 46, assuming that the generated power is used preferentially for charging the electric vehicle 44 and for consumption of the electrical appliances (using a home consumption priority calculation method described later), and calculate the first CO 2 derived from power generation. ２ Emissions and grid-derived secondary CO ２ Emissions may be calculated.

[0044] The power management system is only required to include at least the management device 30. The management device 30 may be installed in a house or in an electric vehicle 44.

[0045] 1 , the solar cell 41 is an example of a distributed power source. The solar cell 41 is installed on the roof of a house and converts light energy into electrical energy (power) by utilizing the photovoltaic effect.

[0046] The power conversion system 42 is installed in the house and converts DC power generated by the solar cell 41 into AC power. The power conversion system 42 is also called a power conditioner.

[0047] The charger 43 is a charging facility that charges a storage battery mounted on the electric vehicle 44. Note that the power management system may include a charger / discharger (on-board charger) instead of the charger 43.

[0048] The electric vehicle 44 is a vehicle that is installed in a home (kept at the home) and runs using all or part of the electric energy stored in a storage battery as power, and may be, for example, an electric vehicle (EV), a plug-in hybrid vehicle (PHEV, PHV), a hybrid vehicle (HEV, HV), etc. The storage battery is also called a secondary battery or a battery.

[0049] The power meter 45 is a power sensor connected between the specific metering panel 10 and the power grid 46, and measures at least one of the value of forward power from the power grid 46 and the value of reverse power from the solar cell 41 to the power grid 46. The power meter 45 measures, for example, power supplied from one of the retail electricity supplier and the power receiving point to the other (that is, power supplied (purchased) from the power grid 46 to the house, and power sold from the house to the power grid 46). In this way, the power meter 45 functions as at least one of a power receiving power meter that measures power supplied from the power grid 46, and a power selling power meter that measures power sold reversely from the house to the retail electricity supplier at a predetermined unit price using the FIT system (Feed-In Tariff).

[0050] The power receiving point where the power meter 45 is installed may be a responsibility separation point between the area belonging to the house and the area belonging to the power grid 46, or it may be a location where an inlet switchboard (low voltage) or a power receiving equipment (high voltage) is located.

[0051] The electricity retailer is a business that buys and sells electricity based on the measured values ​​of the power meter 45. The electricity retailer sells electricity to ordinary households, buildings, factories, etc. The measured values ​​of the power meter 45 are transmitted to the electricity retailer.

[0052] The power grid 46 is a grid operated by a retail electricity supplier or the like, and includes a grid power source.

[0053] The power load 47 is a load such as an electrical appliance that consumes power and is installed in the home. Examples of the power load 47 include loads of home appliances such as an air conditioner, a refrigerator, and a television, but the power load 47 may also include loads of electrical appliances other than home appliances. The power demand due to the power load 47 is also referred to as in-home power demand.

[0054] Here, each power value will be described with reference to FIG. 3. FIG. 3 is a diagram for explaining each power value according to this embodiment. In FIG. 3, power lines and the like are omitted from the illustration, and the terminals 11 to 14 and the flow of power are shown. In FIG. 3, the flow of power generated by the solar cell 41 (PV-generated power) is indicated by a two-dot chain line, the flow of power purchased from the power grid 46 is indicated by a dashed line, and the flow of discharged power from the electric vehicle 44 is indicated by a dashed dotted line.

[0055] PVtoEV is a charging power value derived from power generation, and indicates the power value of the PV-generated power value that is consumed for charging the electric vehicle 44. PVtoCP is a reverse flow power value derived from power generation, and indicates the power value of the PV-generated power value that is sold to grid power (commercial power). PVtoD is an equipment power consumption value derived from power generation, and indicates the power value of the PV-generated power value that is consumed as in-home power demand. EVtoCP is a reverse flow power value derived from discharge, and indicates the power value of the discharge power value (EV discharge power value) of the electric vehicle 44 that is sold to grid power.

[0056] EVtoD is a device power consumption value derived from discharge, and indicates the power value consumed as in-home power demand out of the EV discharge power value of the electric vehicle 44. CPtoD is a device power consumption value derived from the grid, and indicates the power value consumed as in-home power demand out of the power value purchased from the grid power (purchased power value). CPtoEV is a charging power value derived from the grid, and indicates the power value consumed for charging the electric vehicle 44 out of the power value purchased from the grid power.

[0057] Note that "power generation origin" means that the power is generated by the solar cell 41, "discharge origin" means that the power is generated by discharging the electric vehicle 44, and "grid origin" means that the power is purchased from the power grid 46.

[0058] [2. Operation of the Power Management System] Next, the operation of the power management system configured as described above will be described with reference to Figs. 4 to 6. Fig. 4 is a flowchart showing the operation of the power management system (power management method) according to this embodiment. Note that each CO ２ The emission coefficient is acquired in advance and stored in a storage unit (not shown) of the management device 30 .

[0059] 4, the communication unit 31 acquires a power generation value of a distributed power source (S11). In this embodiment, the communication unit 31 acquires a PV power generation value of a solar cell 41, which is an example of a distributed power source, from the power sensor 21. The communication unit 31 functions as a first acquisition unit.

[0060] Next, the communication unit 31 acquires the value of power purchased and sold between the power grid 46 and the house from the power sensor 23 (S12). The communication unit 31 acquires the value of power purchased from the power grid 46 (purchased power value, purchased power amount) and the value of power sold to the power grid 46 (reverse power power value, power sold amount). Note that it is sufficient for the communication unit 31 to acquire at least the power purchased value in step S12. The communication unit 31 functions as a second acquisition unit.

[0061] Next, the communication unit 31 acquires the charge / discharge power value of the electric vehicle 44 from the power sensor 22 (S13). The communication unit 31 acquires the charge power value (charge amount) of charging the electric vehicle 44 and the discharge power value (EV discharge power value, discharge amount) of discharging from the electric vehicle 44. The charge power value acquired in step S13 is an example of a first charge power value. Note that it is sufficient for the communication unit 31 to acquire at least the charge power value in step S13. The communication unit 31 functions as a third acquisition unit.

[0062] Next, the communication unit 31 acquires the device power consumption value of the power load 47 from the power sensor 24 (S14). The communication unit 31 functions as a fourth acquisition unit.

[0063] For example, in steps S11 to S14, the communication unit 31 acquires each power value during a target period in which the electric vehicle 44 is being charged or discharged. Each acquired power value is an integrated value of the power measured during that period. The timing and order of acquiring each power value are not particularly limited.

[0064] Next, the calculation unit 32 calculates a charge power value derived from power generation and a charge power value derived from the grid based on the acquired power values, and calculates a power generation-derived CO 2 based on the calculated charge power value derived from power generation and the charge power value derived from the grid. ２ Emissions (primary CO2 from power generation) ２ emissions), and grid-derived CO ２ Emissions (secondary CO2 from the grid ２ The first CO2 emitted from power generation is calculated (S15). ２ The emission amount is the amount of CO generated when the electric power generated by the solar cell 41 is charged to the electric vehicle 44 and the electric power is generated to the value of the charged electric power. ２ This refers to the amount of CO emitted from the grid. ２ The emissions are calculated by dividing the CO 2 generated when the electric vehicle 44 is charged with purchased power from the power grid 46 and generates power equivalent to the purchased power. ２ This means emissions.

[0065] The calculation unit 32 calculates the first CO 2 derived from power generation using either the EV priority calculation method or the in-home consumption priority calculation method. ２ Emissions and secondary CO2 from the grid ２ Calculate emissions.

[0066] The EV priority calculation method is an example of the first calculation method, and is based on a rule that PV-generated power is used preferentially to charge the electric vehicle 44, and any surplus PV-generated power is consumed for in-house power demand (for example, the power load 47), and is calculated based on the first CO 2 derived from power generation. ２ Emissions and secondary CO2 from the grid ２ This is a calculation method for calculating emissions.

[0067] The calculation unit 32 first calculates the smaller power value between the PV generation power value and a first charging power value (EV_C) that is a charging power value for the electric vehicle 44 as a second charging power value (PVtoEV) derived from power generation. The calculation unit 32 calculates the second charging power value derived from power generation based on the following formula 1 (F1a), where PV is the generated power value measured by the power sensor 21 (the generated power value acquired in step S11) and EV_C is the charging power value for the electric vehicle 44 measured by the power sensor 22 (the charging power value acquired in step S13).

[0068] PVtoEV=Min(PV, EV_C) (Formula 1)

[0069] Then, the calculation unit 32 calculates the calculated second charging power value derived from power generation and the first CO ２ Based on the emission factor, the first CO ２ Here, the solar cell 41 emits CO ２ (i.e., generating non-fossil electricity), ２ The emission factor is zero. ２ The first CO2 emissions from power generation will be zero. ２ Emissions are not limited to being zero.

[0070] The PV power generation value is an example of a power value based on a power generation value.

[0071] Next, the calculation unit 32 calculates a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value of the electric vehicle 44 as a third charging power value derived from the grid (CPtoEV). The calculation unit 32 calculates the third charging power value derived from the grid based on the following formula 2 (F2a).

[0072] CPtoEV=EV_C−PVtoEV (Formula 2)

[0073] This makes it possible to calculate the value of the power charged from the power grid 46 when the PV-generated power value is not enough to charge the electric vehicle 44. In this way, the calculation unit 32 calculates the value of the power charged from the solar cell 41 and the value of the power charged from the power grid 46 separately.

[0074] If the charging of the electric vehicle 44 can be covered by the PV-generated power value, "EV_C" and "PVtoEV" shown in Equation 2 will be the same value, and the value of the power charged from the power grid 46 will be zero. In other words, CPtoEV = zero.

[0075] Then, the calculation unit 32 calculates the calculated third charging power value derived from the grid and the second CO ２ Based on the emission factor, the second CO ２ Here, the CO emissions are calculated when the power from the power grid 46 is generated. ２ (i.e., generating fossil electricity), ２ The emission factor is greater than zero. ２ The emissions will be greater than zero.

[0076] Furthermore, the calculation unit 32 further calculates the following CO ２ In the following description, each power value is calculated, and the CO emission amount corresponding to the calculated power value is calculated. ２ By calculating the emission coefficient, CO ２ An example of calculating the emission amount individually will be described. For example, the CO ２ Add the power values ​​with the same emission coefficient, and add the CO ２ An emission factor may be calculated.

[0077] For example, the calculation is performed assuming that the remaining power value of the PV-generated power used for charging the electric vehicle 44 is consumed for in-house power demand, and therefore the calculation unit 32 calculates the power value of the PV-generated power consumed for in-house power demand as the first device power consumption value derived from power generation (PVtoD). If the device power consumption value acquired from the power sensor 24 is D, the calculation unit 32 calculates the first device power consumption value derived from power generation based on the following formula 3 (F3a):

[0078] PVtoD=Min(PV-PVtoEV,D)...(Formula 3)

[0079] As shown in Equation 3, the calculation unit 32 subtracts the value of Equation 1 from the PV power generation power value (PV-PVtoEV), and calculates the smaller power value between the subtracted value and the device power consumption value as the first device power generation-derived power consumption value. Note that in Equation 1, when PVtoEV=PV, the value obtained by subtracting the value of Equation 1 from the PV power generation power value is zero. In other words, PVtoD=zero.

[0080] Then, the calculation unit 32 calculates the calculated first device power consumption value derived from power generation and the first CO ２ Based on the emission factor, tertiary CO ２ In this embodiment, the amount of third CO emitted from power generation is calculated. ２ This includes, but is not limited to, zero emissions.

[0081] Furthermore, when the electric vehicle 44 is discharging and the PV-generated power alone is insufficient to meet the in-house power demand, the calculation is performed assuming that the EV discharged power is consumed for the in-house power demand, and the calculation unit 32 calculates the power value of the EV discharged power that is consumed for the in-house power demand as the second device power consumption value due to discharge (EVtoD). If the discharged power value of the electric vehicle 44 measured by the power sensor 22 (the discharged power value acquired in step S13) is EV_D, the calculation unit 32 calculates the second device power consumption value due to discharge based on the following formula 4 (F4a):

[0082] EVtoD=Min(EV_D, D-PVtoD) (Formula 4)

[0083] The calculation unit 32 calculates the second device power consumption value derived from discharge as the smaller of the discharge power value of the electric vehicle 44 and the value obtained by subtracting the first device power consumption value derived from power generation (PVtoD) from the device power consumption value. Note that in Equation 4, EVtoD = zero when the electric vehicle 44 is not discharging and when the in-house power demand is met by PV-generated power.

[0084] Then, the calculation unit 32 calculates the calculated second device power consumption value due to discharge and the third CO corresponding to the discharge power. ２ Based on the emission factor, the quaternary CO ２ Calculate the amount of CO emissions. ２The emission coefficient is a negative value, so the quaternary CO ２ The amount of CO emissions is negative. ２ Emissions can be counted negatively.

[0085] Furthermore, when the device power consumption value is greater than the sum of the PV power generation power value and the EV discharge power value, the calculation is performed assuming that the power that is insufficient in the first device power consumption value (PVtoD) derived from power generation and the second device power consumption value (EVtoD) derived from discharge among the device power consumption values ​​is supplied from the power grid 46, and therefore the calculation unit 32 calculates the power value supplied to the home power demand from the power grid 46 as the grid-derived third device power consumption value (CPtoD). The calculation unit 32 calculates the grid-derived third device power consumption value based on the following formula 5 (F5a):

[0086] CPtoD=D-PVtoD-EVtoD...(Formula 5)

[0087] Then, the calculation unit 32 calculates the calculated grid-derived third device power consumption value and the second CO ２ Based on the emission factor, the fifth CO ２ Calculate emissions.

[0088] Furthermore, the remainder of the PV-generated power after being supplied to the electric vehicle 44 and in-home power demand is supplied back to (sold to) the power grid 46, so the calculation unit 32 calculates the power value of the PV-generated power value that is supplied back as a first back flow power value derived from power generation (PVtoCP). The calculation unit 32 calculates the first back flow power value derived from power generation by subtracting the second charging power value derived from power generation and the first device power consumption value derived from power generation from the PV-generated power value. The calculation unit 32 calculates the first back flow power value derived from power generation based on the following equation 6 (F6a):

[0089] PVtoCP=PV-PVtoEV-PVtoD (Formula 6)

[0090] Then, the calculation unit 32 calculates the calculated first reverse flow power value derived from power generation and the fourth CO ２ Based on the emission factor, the sixth CO ２ Calculate the amount of CO emissions. ２The emission factor is the CO2 emitted when selling generated electricity. ２ In this embodiment, the emission coefficient is a negative value, so the third CO ２ The emissions will be negative.

[0091] Furthermore, the remainder of the EV discharge power after consumption for in-home power demand is supplied back to (sold to) the power grid 46, so the calculation unit 32 calculates the power value of the EV discharge power value that is supplied back as the second reverse flow power value derived from discharge (EVtoCP). The calculation unit 32 calculates the second reverse flow power value derived from discharge by subtracting the second device power consumption value derived from discharge from the EV discharge power value. The calculation unit 32 calculates the second reverse flow power value derived from discharge based on the following equation 7 (F7a):

[0092] EVtoCP=EV_D−EVtoD (Formula 7)

[0093] Then, the calculation unit 32 calculates the calculated second reverse flow power value resulting from discharge and the fifth CO ２ Based on the emission factor, the seventh CO ２ Calculate the amount of CO emissions. ２ The emission coefficient is the CO2 emitted when selling discharged electricity. ２ In this embodiment, the emission coefficient is a negative value, so the seventh CO ２ The emissions will be negative.

[0094] Next, the in-home consumption priority calculation method is an example of the second calculation method, and is based on the rule that PV-generated power is supplied with priority to charging the in-home power demand, and any surplus PV-generated power is used to charge the electric vehicle 44, and the first CO 2 derived from power generation is calculated based on the rule that PV-generated power is supplied with priority to charging the electric vehicle 44. ２ Emissions and secondary CO2 from the grid ２ This is a calculation method for calculating emissions.

[0095] The calculation unit 32 first calculates the smaller of the PV-generated power value and the household appliance power consumption value as the power generation-derived first appliance power consumption value (PVtoD). The calculation unit 32 calculates the power generation-derived first appliance power consumption value based on the following formula 8 (F1b):

[0096] PVtoD=Min(PV, D) (Formula 8)

[0097] Then, the calculation unit 32 calculates the calculated first device power consumption value derived from power generation and the first CO ２ Based on the emission factor, tertiary CO ２ In this embodiment, the amount of third CO emitted from power generation is calculated. ２ Emissions will be zero.

[0098] Next, calculation is performed assuming that the remaining PV-generated power used for in-house power demand is used to charge the electric vehicle 44. Therefore, the calculation unit 32 calculates a power value obtained by subtracting the first device power consumption value derived from power generation from the PV-generated power value as the second charging power value derived from power generation (PVtoEV). The calculation unit 32 calculates the second charging power value derived from power generation based on the following formula 9 (F2b).

[0099] PVtoEV=Min(PV-PVtoD, EV_C) (Formula 9)

[0100] The smaller of the remaining power value (PV-PVtoD) of the PV-generated power used for in-house power demand and the first charging power value (EV_C) of the electric vehicle 44 is calculated as the second charging power value derived from power generation.

[0101] Then, the calculation unit 32 calculates the calculated second charging power value derived from power generation and the first CO ２ Based on the emission factor, the first CO ２ In this embodiment, the first CO 2 emitted from the power generation is calculated. ２ Emissions will be zero.

[0102] Next, in Equation 9, when PVtoEV=PV-PVtoD, the calculation is performed assuming that the charging power of the electric vehicle 44 is insufficient and that the insufficient power is charged by power from the power grid 46. Therefore, the calculation unit 32 calculates the power value supplied from the power grid 46 to charge the electric vehicle 44 as the third charging power value (CPtoEV) derived from the grid. The calculation unit 32 calculates the third charging power value derived from the grid based on the following Equation 10 (F3b).

[0103] CPtoEV=EV_C−PVtoEV (Formula 10)

[0104] Note that Equation 10 is the same as Equation 2, and therefore a description thereof will be omitted.

[0105] Then, the calculation unit 32 calculates the calculated third charging power value derived from the grid and the second CO ２ Based on the emission factor, the second CO ２ In Equation 9, if PVtoEV = PV - PVtoD, the second CO ２ The emissions will be a positive value.

[0106] Furthermore, when the electric vehicle 44 is discharging and the PV-generated power alone is insufficient to meet the household power demand, the calculation unit 32 calculates the first device power consumption value (EVtoD) derived from power generation based on the following formula 11 (F4b), as in the case of the EV-priority calculation method.

[0107] EVtoD=Min(EV_D, D-PVtoD) (Formula 11)

[0108] Note that since Equation 11 is the same as Equation 4, a description thereof will be omitted.

[0109] Then, the calculation unit 32 calculates the calculated first device power consumption value derived from power generation and the third CO ２ Based on the emission factor, the quaternary CO ２ Calculate the amount of discharge-derived quaternary CO ２ The amount of CO emissions is negative. ２ Emissions can be counted negatively.

[0110] Furthermore, when the device power consumption value is greater than the sum of the PV power generation value and the EV discharge power value, the calculation unit 32 calculates the grid-derived third device power consumption value (CPtoD) based on the following equation 12 (F5b), as in the case of the EV priority calculation method.

[0111] CPtoD=D-PVtoD-EVtoD (Formula 12)

[0112] Note that Equation 12 is the same as Equation 5, and therefore a description thereof will be omitted.

[0113] Then, the calculation unit 32 calculates the calculated grid-derived third device power consumption value and the second CO ２ Based on the emission factor, the fifth CO ２ Calculate emissions.

[0114] Furthermore, the remainder of the PV-generated power that is supplied to the electric vehicle 44 and the household power demand is supplied back to the power grid 46 (sold as power). Therefore, similar to the EV-priority calculation method, the calculation unit 32 calculates the first backflow power value (PVtoCP) derived from power generation based on the following equation 13 (F6b).

[0115] PVtoCP=PV-PVtoEV-PVtoD (Formula 13)

[0116] Note that Equation 13 is the same as Equation 6, and therefore a description thereof will be omitted.

[0117] Then, the calculation unit 32 calculates the calculated first reverse flow power value derived from power generation and the fourth CO ２ Based on the emission factor, the sixth CO ２ Calculate emissions.

[0118] Furthermore, the remainder of the EV discharge power after consumption for in-house power demand is supplied back to (sold by) the power grid 46. Therefore, similar to the EV-priority calculation method, the calculation unit 32 calculates the second backflow power value (EVtoCP) derived from discharge based on the following equation 14 (F7b).

[0119] EVtoCP=EV_D−EVtoD (Formula 14)

[0120] Note that Equation 14 is the same as Equation 7, and therefore a description thereof will be omitted.

[0121] Then, the calculation unit 32 calculates the calculated second reverse flow power value resulting from discharge and the fifth CO ２ Based on the emission factor, the seventh CO ２ Calculate emissions.

[0122] Next, the calculation unit 32 calculates the CO ２ In the case of the EV priority calculation method, the calculation unit 32 calculates the first CO 2 emission amount derived from power generation calculated using Equation 1.２ emissions and the secondary CO from the system calculated using Equation 2 ２ By adding up the CO emissions during charging of the electric vehicle 44 during the target period, ２ In the case of the in-home consumption priority calculation method, the calculation unit 32 calculates the first CO 2 emission amount derived from power generation calculated using Equation 9. ２ Emissions and system-derived secondary CO calculated using Equation 10 ２ The CO 2 emissions during charging of the electric vehicle 44 are calculated by adding the CO 2 emissions during charging of the electric vehicle 44. ２ Calculate emissions.

[0123] The calculation unit 32 calculates the first CO ２ If the emission factor is zero, then CO ２ Discharge-derived quaternary CO with negative emissions ２ Emissions and discharge-derived 7th CO ２ At least one of the CO 2 emissions during charging of the electric vehicle 44 is used. ２ The calculation unit 32 may calculate the first CO 2 emission amount derived from power generation, for example. ２ Emissions and secondary CO2 from the grid ２ Emissions and discharge-derived quaternary CO ２ Emissions and discharge-derived 7th CO ２ By adding at least one of the CO emissions during charging of the electric vehicle 44 ２ Emissions may be calculated.

[0124] The calculation unit 32 calculates the first CO ２ If the emission factor is zero, then CO ２ Grid-derived fifth CO with positive emissions ２ Emissions and CO ２ The sixth CO2 from power generation, which has negative emissions ２ Using at least one of the CO emissions ２ Emissions (e.g., CO ２ The calculation unit 32 may calculate, for example, the fifth CO ２ Emissions and sixth CO2 from power generation ２ By adding the CO emissions of the house ２ Emissions may be calculated.

[0125] Next, the communication unit 31 receives the charging CO 2 of the electric vehicle 44 calculated by the calculation unit 32. ２ The communication unit 31 outputs the amount of CO2 emitted during charging to, for example, at least one of the user's information terminal and the server through communication. ２ The amount of emissions may be transmitted.

[0126] The calculation unit 32 calculates CO ２ Fig. 5 is a diagram showing an example of a change in the calculation method of power in the power management system according to the present embodiment. In Fig. 5, the CO2 emissions of an individual house (one house) are calculated. ２ CO emissions and the group (housing group) that includes the individual home ２ This shows an example in which the calculation method is controlled based on the relationship with the amount of CO2 emissions. The group of houses is set in advance. The method for setting the group of houses is not particularly limited, and for example, the group of houses may be set to include a predetermined number of houses or a predetermined area, or may be set based on the amount of CO2 emissions from a predetermined application (for example, an EV (electric vehicle 44)). ２ This may be set via a dedicated application for managing emissions.

[0127] As shown in FIG. 5, the calculation unit 32 calculates, for example, the CO ２ If emissions are greater than 0 and the EV priority calculation method is used, the CO ２ If emissions are greater than 0, maintain the EV priority calculation method and CO ２ Calculate the CO emissions of EVs as a group ２ If emissions are 0 or less, switch from the EV priority calculation method to the home consumption priority calculation method and CO ２ Emissions may be calculated.

[0128] Furthermore, the calculation unit 32 may calculate, for example, the CO ２ When emissions are zero or less and the in-home consumption priority calculation method is used, the CO2 of EVs as a group ２ If the amount of emissions is greater than 0, switch from the in-house consumption priority calculation method to the EV priority calculation method and calculate CO ２Calculate the CO emissions of EVs as a group ２ If emissions are 0 or less, maintain the in-home consumption priority calculation method and CO ２ Emissions may be calculated.

[0129] In this way, the calculation unit 32 calculates the CO ２ CO2 emissions from EVs for individual homes will be reduced to zero. ２ CO2 emissions from EVs as a residential group ２ A common calculation method may be determined for each house, with priority given to reducing emissions. ２ Even if emissions are below zero, CO ２ If the emission amount is greater than 0, the CO emissions of other homes in the housing group other than the individual home in question are calculated. ２ In order to reduce CO emissions, the EV-priority calculation method may be used for all of the houses included in the housing group (including the particular individual house). ２ The calculation method may be determined so that the amount of emissions is zero or less.

[0130] The communication unit 31 receives the CO2 of the EV from each house in the housing group. ２ Emissions and CO2 of the home EV ２ The calculation unit 32 calculates the CO emissions of the EVs of each house in the housing group including the home. ２ By adding up the emissions, the CO ２ Emissions may be calculated.

[0131] Furthermore, the calculation unit 32 may dynamically switch the calculation method using one of the following switching methods.

[0132] The first switching method is to calculate the CO2 of EVs based on the EV priority calculation method or the in-home consumption priority calculation method for a specified period in the past for a home. ２ Emissions and residential CO ２ Based on the CO emissions, ２ The calculation unit 32 determines the method for calculating the CO emissions of the EV. ２ Emissions > CO from homes ２Emissions or CO2 of EV ２ If emissions are greater than 0, CO is calculated using the EV priority calculation method. ２ Calculate the CO emissions of EVs ２ Emissions ≦ Residential CO ２ Emissions or CO2 of EV ２ If emissions are ≦0, CO is calculated using the in-home consumption priority calculation method. ２ The CO emissions of the electric vehicle 44 and the house may be calculated. ２ Emissions can be reduced in a balanced manner.

[0133] The second switching method is the CO2 of all EVs in multiple homes (housing groups) calculated based on the EV priority calculation method or the in-home consumption priority calculation method. ２ By calculating the total CO emissions, the CO ２ Calculate the amount of CO ２ CO emissions based on ２ The calculation unit 32 determines the method for calculating the CO emissions of an EV user group, for example. ２ If emissions are greater than 0, CO is calculated using the EV priority calculation method. ２ Calculate the CO emissions of the EV user group. ２ If emissions are ≦0, CO is calculated using the in-home consumption priority calculation method. ２ Emissions may be calculated.

[0134] The third switching method is the CO2 of all the homes in a residential group calculated based on the EV priority calculation method or the home consumption priority calculation method. ２ By calculating the total CO emissions of the residential user group, ２ Calculate the amount of CO ２ CO emissions based on ２ The calculation unit 32 determines the method for calculating the CO emissions for a residential user group, for example. ２ If emissions are greater than 0, CO is calculated using the in-home consumption priority calculation method. ２ Calculate the CO emissions for the residential user group. ２ If emissions are ≦0, CO is calculated using the EV priority calculation method. ２Emissions may be calculated.

[0135] Furthermore, the calculation unit 32 calculates, for example, the CO ２ The total CO emissions and the CO emissions of each of the multiple homes ２ The total CO emissions are compared with the total CO emissions. ２ The calculation unit 32 may determine which of the EV priority calculation method and the in-home consumption priority calculation method to use based on the comparison result.

[0136] Here, a method for calculating the electric power consumption of the electric vehicle 44 and the house will be described with reference to Fig. 6. Fig. 6 shows a method for calculating the CO2 consumption of the electric vehicle 44 and the house in the power management system according to this embodiment. ２ 6 is a diagram showing an example of a method for counting emissions. In FIG. 6, the calculation formulas for calculating similar power values ​​in the EV priority calculation method and the home consumption priority calculation method are arranged side by side. ２ ±0 is the CO calculated using the formula ２ The CO emissions of the electric vehicle 44 ２ It indicates whether the amount of CO2 emitted is counted as positive, zero, or negative. ２ ±0 is the CO calculated using the formula ２ Emissions are CO2 from a house ２ Indicates whether the emissions are counted as positive, zero, or negative.

[0137] As shown in FIG. 6, the formulas indicated by F2a and F3b are formulas for calculating the power value of the fossil fuel power supplied from the power grid 46 to the electric vehicle 44, and the CO ２ In this case, the amount of CO2 emitted from the house is counted as a positive value because the generated electricity supplied from the solar cell 41 to the electric vehicle 44 is excluded (separated) from the calculation. ２ Emissions remain unchanged.

[0138] The formulas indicated by F5a and F5b are formulas for calculating the power value of fossil fuel power supplied from the power grid 46 to the power load 47, and are also used to calculate the CO２ In this case, the discharged power supplied from the electric vehicle 44 to the electric load 47 is excluded (separated) from the calculation, so the CO ２ Emissions remain unchanged.

[0139] The formulas indicated by F1a, F3a, F1b, and F2b are formulas for calculating the non-fossil fuel power (generated power) supplied from the solar cell 41 to the electric vehicle 44 or the power load 47, and are used to calculate the CO ２ Emissions remain unchanged.

[0140] The formulas indicated by F4a and F4b are formulas for calculating the discharge power supplied from the electric vehicle 44 to the electric load 47, and the CO ２ In this case, the fossil fuel electricity supplied from the power grid 46 to the power load 47 is not included in the calculation, so the CO emissions of the house ２ Emissions remain unchanged.

[0141] The formulas indicated by F6a and F6b are formulas for calculating the power generated by the solar cell 41 to be sold to the power grid 46, and are used to calculate the CO ２ In this case, the amount of CO emissions from the electric vehicle 44 is counted as a negative value because the generated power supplied from the solar cell 41 to the electric vehicle 44 is excluded (separated) from the calculation. ２ Emissions remain unchanged.

[0142] The formulas indicated by F7a and F7b are formulas for calculating the discharged power sold from the electric vehicle 44 to the power grid 46, and are used to calculate the CO ２ In this case, the discharged power supplied from the electric vehicle 44 to the power load 47 is excluded (separated) from the calculation, so the CO ２ Emissions remain unchanged.

[0143] In this way, by using the calculation formulas F1a (Formula 1) to F7a (Formula 7) and the calculation formulas F1b (Formula 8) to F7b (Formula 14) in this embodiment, it is possible to separate the power supplied to the power load 47 into the power from the grid, the power generation, and the power discharge. ２ Double counting of emissions is prevented (for example, the circled areas shown in Figure 6), allowing for more accurate CO ２ For example, more accurate CO emissions can be calculated without adding more power sensors or performing complex calculations. ２ Therefore, the CO emission amount can be calculated more accurately with a simple configuration while suppressing an increase in the processing amount of the management device 30. ２ Emissions can be calculated.

[0144] For example, the calculation unit 32 separates the first charging power value into a second charging power value derived from power generation and a third charging power value derived from the grid, and separates the reverse flow power value into a value obtained by subtracting the second charging power value derived from power generation and the first device power consumption value derived from power generation from the generated power value, and a value obtained by subtracting the second device power consumption value derived from discharge from the discharge power value. ２ Emissions and residential CO ２ The amount of emissions may be calculated.

[0145] The power calculated by F1a (Equation 1) is the upper limit (supply upper limit) when maximizing the amount of power generated by the solar cell 41 that can be supplied to the electric vehicle 44. The power calculated by F2b (Equation 9) is the upper limit when maximizing the amount of power generated by the solar cell 41 that can be supplied to the electric load 47, in other words, the lower limit (supply lower limit) of the amount of power generated by the solar cell 41 that can be supplied to the electric vehicle 44.

[0146] In this case, the amount of power generated by solar cell 41 that is supplied to electric vehicle 44 may be any value as long as it is equal to or greater than the lower supply limit and equal to or less than the upper supply limit. This allows the power generated by solar cell 41 to be distributed in a balanced manner between electric vehicle 44 and power load 47. Note that the distribution method may be set by the user or may be set in advance, for example.

[0147] (Variation of the Embodiment) The configuration of a power management system according to this variation will be described below with reference to FIG. 7 . The following description will focus on differences from the embodiment, and descriptions of content that is the same as or similar to the embodiment will be omitted or simplified. FIG. 7 is a diagram showing the configuration of a power management system according to this variation. In this variation, power sensors 21a to 23a are provided on devices connected to a specific metering panel 10a, and an example will be described in which the management device 30 acquires measurement results of power values ​​from these devices. Furthermore, in this variation, the power management system has three power sensors. In the example of FIG. 7 , the power supplied to the power load 47 is calculated from the other three power values ​​using Kirchhoff's law. The power supplied to the power load 47 may be calculated by the calculation unit 32.

[0148] As shown in FIG. 7 , a power sensor 21 a for measuring the power generated by the solar cell 41 is provided in the PV power conditioner 42 a connected to terminal 11, a power sensor 22 a for measuring the charge / discharge power value of the electric vehicle 44 is provided in the V2H power conditioner 50 connected to terminal 12, and a power sensor 23 a for measuring the forward power value from the power grid 46 (power purchased) and the reverse power value to the power grid 46 (power sold).

[0149] The PV power conditioner 42a is connected between the terminal 11 and the solar cell 41. The PV power conditioner 42a corresponds to, for example, the power conversion system 42 shown in FIG.

[0150] A V2H (Vehicle to Home) power conditioner 50 is connected between the terminal 12 and the electric vehicle 44 .

[0151] The smart meter 45a is connected between the terminal 13 and the power grid 46. The smart meter 45a corresponds to, for example, the power meter 45 shown in FIG.

[0152] Each of the power sensors 21a, 22a, and 23a is connected to the management device 30 so as to be able to communicate with the management device 30, and outputs the measured power values ​​to the management device 30 via communication.

[0153] In a power management system configured in this way, the same effects as those of the embodiment can be achieved.

[0154] (Effects, etc.) The invention derived from the disclosure of this specification and the effects, etc. obtained by the invention will be described below.

[0155] (Invention 1) An energy management system for managing the power of an electric vehicle and a distributed power source, wherein the distributed power source, the electric vehicle, and a power grid are electrically connected, and the energy management system includes a first acquisition unit that acquires a generated power value of the distributed power source, a second acquisition unit that acquires a purchased power value from the power grid, a third acquisition unit that acquires a first charging power value for the electric vehicle, and a calculation unit, and calculates different CO ２ an emission coefficient is set, and the calculation unit calculates a second charging power value derived from power generation, which is a smaller power value of a power value based on the generated power value and the first charging power value, and a first CO ２ Based on the emission factor, the first CO ２ a third charging power value derived from the grid, which is a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value; and a second CO ２ Based on the emission factor, the second CO ２ Calculate the amount of CO2 emitted from power generation. ２ Emissions and the second CO ２ CO emissions of the electric vehicle based on ２ It is a power management system that calculates emissions.

[0156] This makes it possible to estimate the second charging power value derived from power generation and the third charging power value derived from the grid even when power derived from power generation and power derived from the grid are mixed. ２ and the second CO 2 derived from the grid based on the third charging power value derived from the grid. ２ Therefore, according to the power management system, it is possible to calculate the CO2 emissions generated when generating the charging power that is charged into the storage battery of the electric vehicle. ２ Emissions can be better managed.

[0157] (Invention 2) The power value based on the generated power value is the generated power value, and the calculation unit assumes that the generated power is used preferentially for charging the electric vehicle, and calculates the first CO ２ Emissions and the second CO ２ The power management system of the first aspect calculates emissions.

[0158] As a result, the CO2 when it is assumed that the generated power is used preferentially for charging electric vehicles and the consumption of electrical equipment is ２ Emissions can be better managed.

[0159] (Invention 3) The distributed power source, the electric vehicle, and the power grid are further electrically connected to an electric device, and a fourth acquisition unit is provided to acquire an electric device power consumption value consumed by the electric device, and the calculation unit calculates a first electric device power consumption value resulting from electric power generation, which is a power value obtained by subtracting the second charging power value resulting from electric power generation from the generated electric power value, and the smaller of the electric device power consumption value and the first CO ２ Based on the emission factor, tertiary CO ２ The power management system of Invention 2 calculates the amount of emissions.

[0160] This allows the power value supplied to the electrical equipment (electric load 47) from the generated power value to be calculated, so that the third CO ２ Emissions can be better managed.

[0161] (Invention 4) The distributed power source, the electric vehicle, and the power grid are further electrically connected to an electric device, and further include a fourth acquisition unit that acquires an equipment power consumption value consumed by the electric device, and the power value based on the generated power value is a value obtained by subtracting a first equipment power consumption value derived from power generation, which is a smaller power value of the generated power value and the equipment power consumption value, from the generated power value, and the calculation unit assumes that the generated power is used preferentially for charging the electric vehicle and consumption by the electric device, and calculates the first CO 2 derived from power generation. ２ Emissions and the second CO ２ The power management system of the first aspect calculates emissions.

[0162] As a result, the CO2 reduction rate when it is assumed that the generated power is used preferentially for charging the electric vehicle and for consuming the electrical equipment is ２ Emissions can be better managed.

[0163] (Invention 5) The third acquisition unit further acquires a discharge power value of the electric vehicle, and the calculation unit calculates a second device power consumption value resulting from discharge, which is a smaller power value between the discharge power value and a power value obtained by subtracting the first device power consumption value resulting from power generation from the device power consumption value, and a third CO corresponding to the discharge power. ２ Based on the emission factor, the quaternary CO ２ The power management system according to the third or fourth aspect of the present invention calculates emissions.

[0164] This makes it possible to calculate the power value supplied to the electrical equipment (electrical load 47) from the discharge power value. ２ Emissions can be better managed.

[0165] (Invention 6) The calculation unit calculates a third device power consumption value derived from the grid by subtracting the first device power consumption value derived from power generation and the second device power consumption value derived from discharge from the device power consumption value; ２ Based on the emission factor, the fifth CO ２ The power management system of the fifth aspect of the present invention calculates emissions.

[0166] This allows the value of the purchased power to be supplied to the electrical equipment (electric load 47) to be calculated. ２ Emissions can be better managed.

[0167] (Invention 7) The calculation unit calculates a first reverse flow power value resulting from power generation, which is obtained by subtracting the second charging power value resulting from power generation and the first device power consumption value resulting from power generation from the generated power value, and a fourth CO ２ Based on the emission factor, the sixth CO ２ The power management system of Invention 5 or 6, wherein the emission amount is calculated.

[0168] This makes it possible to calculate the amount of power that is fed back to the power grid from the generated power. ２ Emissions can be better managed.

[0169] (Invention 8) The calculation unit calculates a second reverse flow power value resulting from discharge by subtracting a second device power consumption value resulting from discharge from the discharge power value, and a fifth CO ２ Based on the emission factor, the seventh CO ２ The power management system according to any one of Inventions 5 to 7, wherein the emission amount is calculated.

[0170] This makes it possible to calculate the amount of power that is backflowed to the power grid from the discharged power. ２ Emissions can be better managed.

[0171] (Invention 9) The distributed power source and the electric vehicle are installed in a facility, the second acquisition unit further acquires a reverse flow power value to the electric power grid, the calculation unit separates the first charging power value into the second charging power value derived from power generation and the third charging power value derived from the grid, separates the reverse flow power value into a value obtained by subtracting the second charging power value derived from power generation and the first device power consumption value derived from power generation from the generated power value, and a value obtained by subtracting the second device power consumption value derived from discharge from the discharged power value, and calculates a CO2 reduction factor of the electric vehicle based on each of the separated power values. ２ emissions and CO2 of the facility ２The power management system according to any one of Inventions 5 to 8, wherein the power management system calculates the amount of energy consumed and the amount of electricity emitted.

[0172] This reduces CO emissions between electric vehicles and homes. ２ This prevents double counting of emissions, so CO ２ Emissions can be better managed.

[0173] (Invention 10) The calculation unit assumes that the generated power is used preferentially for charging the electric vehicle out of charging the electric vehicle and consuming the electric device, and calculates the first CO ２ Emissions and the second CO ２ a first calculation method for calculating CO emissions, and a first calculation method for calculating the first CO emissions derived from power generation, assuming that the generated power is used preferentially for charging the electric vehicle and consuming the electric device. ２ Emissions and the second CO ２ The power management system according to any one of Inventions 3 to 9, wherein the power management system is capable of switching between the first calculation method and the second calculation method for calculating the emission amount.

[0174] This allows you to change the calculation method and calculate the CO2 emissions of electric vehicles and homes. ２ It can effectively reduce emissions.

[0175] (Invention 11) The distributed power source is installed in a facility, and the calculation unit calculates a CO₂ consumption of the electric vehicle in the facility for a predetermined period in the past. ２ emissions and CO2 of the facility ２ The power management system of the present invention determines whether to use the first calculation method or the second calculation method based on the amount of energy emitted.

[0176] This will reduce CO2 emissions from electric vehicles and homes. ２ Emissions can be reduced in a balanced manner.

[0177] (Invention 12) The electric vehicles are installed in a facility, and the calculation unit calculates the CO ２A power management system according to a tenth aspect of the present invention calculates a total value of emissions, and determines whether to use the first calculation method or the second calculation method based on the calculated total value.

[0178] This allows for the CO ２ The total amount of emissions can be effectively reduced.

[0179] (Invention 13) The electric vehicle is installed in a facility, and the calculation unit calculates the CO2 of the facility for each of the plurality of facilities. ２ A power management system according to a tenth aspect of the present invention calculates a total value of emissions, and determines whether to use the first calculation method or the second calculation method based on the calculated total value.

[0180] This allows for CO2 reduction for multiple homes. ２ The total amount of emissions can be effectively reduced.

[0181] (Invention 14) The distributed power sources and the electric vehicles are installed in a facility, and the calculation unit calculates the CO ２ The total amount of CO emissions at each of the facilities ２ The power management system of the tenth aspect of the present invention compares the calculated value of the power consumption with the total value of the amount of discharged electricity, and determines whether to use the first calculation method or the second calculation method based on the comparison result.

[0182] This allows for the CO ２ Total emissions and CO emissions for multiple homes ２ This will allow for a balanced reduction in the total amount of emissions.

[0183] (Invention 15) A power management method executed by a power management system that manages power related to an electric vehicle and a distributed power source, the distributed power source, the electric vehicle, and a power grid are electrically connected, a generated power value of the distributed power source is acquired, a purchased power value from the power grid is acquired, a first charging power value for the electric vehicle is acquired, and different CO ２a second charging power value derived from power generation, which is a smaller power value of a power value based on the generated power value and the first charging power value; and a first CO emission coefficient corresponding to the generated power. ２ Based on the emission factor, the first CO ２ a third charging power value derived from the grid, which is a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value; and a second CO ２ Based on the emission factor, the second CO ２ Calculate the amount of CO2 emitted from power generation. ２ Emissions and the second CO ２ CO emissions of the electric vehicle based on ２ This is an electricity management method that calculates emissions.

[0184] This provides the same effects as the above-mentioned power management system.

[0185] (Invention 16) A program for causing a computer to execute the power management method of invention 15.

[0186] This provides the same effects as the above-mentioned power management system.

[0187] These general or specific aspects may be realized as a system, a method, an integrated circuit, a computer program, or a non-transitory recording medium such as a computer-readable CD-ROM, or as any combination of the system, method, integrated circuit, computer program, or recording medium. The program may be pre-stored in the recording medium, or may be supplied to the recording medium via a wide area communication network including the Internet.

[0188] (Other Embodiments) While the power management system according to one or more aspects has been described above based on the embodiments and modifications, the present invention is not limited to these embodiments and modifications. As long as they do not deviate from the spirit of the present invention, various modifications that a person skilled in the art can conceive of to the present embodiment and modifications constructed by combining components of different embodiments may also be included in the present invention.

[0189] For example, in the above-described embodiment and modified example, the management device 30 is built into the specific weighing panel 10, 10a, but this is not limiting. Some or all of the functions of the management device 30 may be possessed by the electric vehicle 44, or may be possessed by an information processing device (e.g., a server) capable of communicating with the specific weighing panel 10, 10a.

[0190] Furthermore, the specific metering panel 10, 10a in the above-described embodiment and modified example may be a stand-alone device or may be built into a distribution board or the like.

[0191] Furthermore, the communication unit 31 in the above-described embodiment and modified example ２ The example of outputting CO ２ Instead of CO emissions or CO ２ CO emissions and primary CO from power generation ２ Emissions and secondary CO2 from the grid ２ The amount of emissions may be output.

[0192] Furthermore, in the above-described embodiment and modified examples, when the electric vehicle 44 is a vehicle that also consumes gasoline to run, such as a plug-in hybrid vehicle or a hybrid vehicle, the calculation unit 32 calculates the CO ２ Calculate the CO emissions of the electric vehicle 44 ２ CO2 from gasoline may be added to the total emissions. ２ Any known method may be used to calculate the amount of emissions. For example, the amount of gasoline consumed obtained from a fuel consumption sensor of the vehicle and the amount of CO corresponding to the gasoline may be calculated. ２ Emission factor (e.g., 2.32 kg-CO ２ / L). ２ Emissions are residential CO ２ It is not added to emissions.

[0193] In addition, each CO in the above embodiment and modified example ２ The emission coefficient may be a fixed value or may be a value that changes every predetermined period (for example, every 30 minutes). ２The emission coefficient may be a value set by a public institution, for example. ２ Charging control may be performed so that the electric vehicle 44 is charged based on at least one of the power generation method and timing that reduces the emission coefficient.

[0194] In the above embodiments, each component may be configured with dedicated hardware, or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0195] The order in which the steps in the flowchart are executed is merely an example for specifically explaining the present invention, and other orders may be used. Some of the steps may be executed simultaneously (in parallel) with other steps, or some of the steps may not be executed.

[0196] The division of functional blocks in the block diagram is an example, and multiple functional blocks may be realized as a single functional block, one functional block may be divided into multiple blocks, or some functions may be moved to another functional block.Furthermore, the functions of multiple functional blocks having similar functions may be processed in parallel or in time-sharing by a single piece of hardware or software.

[0197] Furthermore, the management device 30 according to the above embodiment may be realized as a single device or may be realized by multiple devices. When the management device 30 is realized by multiple devices, the components of the management device 30 may be distributed in any manner among the multiple devices. When the management device 30 is realized by multiple devices, the communication method between the multiple devices is not particularly limited, and may be wireless communication or wired communication. Furthermore, wireless communication and wired communication may be combined between the devices.

[0198] Furthermore, each component described in the above embodiments may be implemented as software or, typically, as an LSI, which is an integrated circuit. These components may be individually integrated into a single chip, or some or all of them may be integrated into a single chip. Here, the term "LSI" is used, but depending on the level of integration, it may also be referred to as an IC, system LSI, super LSI, or ultra LSI. Furthermore, the integrated circuit implementation method is not limited to LSI, and may be implemented using a dedicated circuit (a general-purpose circuit that executes a dedicated program) or a general-purpose processor. After LSI fabrication, a field programmable gate array (FPGA) that can be programmed or a reconfigurable processor that can reconfigure the connections or settings of circuit cells within the LSI may also be used. Furthermore, if an integrated circuit technology that replaces LSI emerges due to advances in semiconductor technology or a derivative technology, that technology may naturally be used to integrate the components.

[0199] A system LSI is an ultra-multifunctional LSI manufactured by integrating multiple processing units on a single chip, and is specifically a computer system comprising a microprocessor, ROM, RAM, etc. The ROM stores computer programs. The system LSI achieves its functions when the microprocessor operates in accordance with the computer programs.

[0200] Another aspect of the present invention may be a computer program that causes a computer to execute each of the characteristic steps included in the power management method shown in FIG.

[0201] Furthermore, for example, the program may be a program to be executed by a computer. Another aspect of the present invention may be a computer-readable non-transitory recording medium on which such a program is recorded. For example, such a program may be recorded on a recording medium and distributed or circulated. For example, the distributed program may be installed in a device having another processor, and the program may be executed by the processor, thereby causing the device to perform each of the above processes.

[0202] 31 Communication unit (first acquisition unit, second acquisition unit, third acquisition unit, fourth acquisition unit, output unit) 32 Calculation unit 41 Solar cell 44 Electric vehicle 46 Power system

Claims

1. An energy management system that manages the power of an electric vehicle and a distributed power source, wherein the distributed power source, the electric vehicle, and a power grid are electrically connected, and the energy management system includes a first acquisition unit that acquires a generated power value of the distributed power source, a second acquisition unit that acquires a purchased power value from the power grid, a third acquisition unit that acquires a first charging power value for the electric vehicle, and a calculation unit, and calculates different CO2 values ​​for the generated power value and the purchased power value. ２ an emission coefficient is set, and the calculation unit calculates a second charging power value derived from power generation, which is a smaller power value between the power value based on the generated power value and the first charging power value, and a first CO emission coefficient corresponding to the generated power. ２ Based on the emission factor, the first CO ２ a third charging power value derived from the grid, which is a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value, and a second CO2 emission amount corresponding to purchased power. ２ Based on the emission factor, the second CO ２ Calculate the amount of CO2 emitted from power generation. ２ Emissions and the second CO ２ CO emissions of the electric vehicle based on ２ An electricity management system that calculates emissions.

2. The power value based on the generated power value is the generated power value, and the calculation unit assumes that the generated power is used preferentially for charging the electric vehicle, and calculates the first CO ２ Emissions and the second CO ２ The power management system according to claim 1 , wherein an emission amount is calculated.

3. The distributed power source, the electric vehicle, and the power grid are further electrically connected to an electric device, and further comprising a fourth acquisition unit that acquires an equipment power consumption value consumed by the electric device, and the calculation unit calculates a first equipment power consumption value derived from power generation, which is the smaller of the power value obtained by subtracting the second charging power value derived from power generation from the generated power value and the equipment power consumption value, and the first CO ２ Based on the emission factor, tertiary CO ２ The power management system according to claim 2 , wherein an emission amount is calculated.

4. The distributed power source, the electric vehicle, and the power grid are further electrically connected to an electric device, and a fourth acquisition unit is further provided that acquires an equipment power consumption value consumed by the electric device, and the power value based on the generated power value is a value obtained by subtracting a first equipment power consumption value derived from power generation, which is the smaller power value of the generated power value and the equipment power consumption value, from the generated power value, and the calculation unit calculates the first CO 2 derived from power generation assuming that the generated power is used preferentially for charging the electric vehicle and for consumption by the electric device. ２ Emissions and the second CO ２ The power management system according to claim 1 , wherein an emission amount is calculated.

5. The third acquisition unit further acquires a discharge power value of the electric vehicle, and the calculation unit calculates a second device power consumption value resulting from discharge, which is the smaller of the discharge power value and a power value obtained by subtracting the first device power consumption value resulting from power generation from the device power consumption value, and a third CO corresponding to the discharge power. ２ Based on the emission factor, the quaternary CO ２ The power management system according to claim 3 or 4, wherein an emission amount is calculated.

6. The calculation unit calculates a third device power consumption value derived from the grid by subtracting the first device power consumption value derived from power generation and the second device power consumption value derived from discharge from the device power consumption value, and the second CO ２ Based on the emission factor, the fifth CO ２ The power management system according to claim 5 , wherein an emission amount is calculated.

7. The calculation unit calculates a first reverse flow power value derived from power generation, which is obtained by subtracting the second charging power value derived from power generation and the first device power consumption value derived from power generation from the generated power value, and a fourth CO ２ Based on the emission factor, the sixth CO ２ The power management system according to claim 5 , wherein an emission amount is calculated.

8. The calculation unit calculates a second reverse flow power value resulting from discharge by subtracting the second device power consumption value resulting from discharge from the discharge power value, and a fifth CO ２ Based on the emission factor, the seventh CO ２ The power management system according to claim 5 , wherein an emission amount is calculated.

9. The distributed power source and the electric vehicle are installed in a facility, and the second acquisition unit further acquires a reverse flow power value to the power grid, and the calculation unit separates the first charging power value into the second charging power value derived from power generation and the third charging power value derived from the grid, separates the reverse flow power value into a value obtained by subtracting the second charging power value derived from power generation and the first device power consumption value derived from power generation from the generated power value, and a value obtained by subtracting the second device power consumption value derived from discharge from the discharged power value, and calculates a CO2 reduction ratio of the electric vehicle based on each of the separated power values. ２ emissions and CO2 of the facility ２ The power management system according to claim 5 , further comprising: a power consumption control unit for controlling a power consumption of the power generation unit; 10. The calculation unit assumes that the generated power is used preferentially for charging the electric vehicle out of charging the electric vehicle and consuming the electric device, and calculates the first CO ２ Emissions and the second CO ２ a first calculation method for calculating CO emissions, and a first calculation method for calculating the first CO emissions derived from power generation, assuming that the generated power is used preferentially for charging the electric vehicle and consuming the electric device. ２ Emissions and the second CO ２ The power management system according to claim 3 or 4, wherein the power management system is capable of switching between a first calculation method and a second calculation method for calculating an emission amount.

11. The distributed power source is installed in a facility, and the calculation unit calculates a CO₂ of the electric vehicle at the facility for a predetermined period in the past. ２ emissions and CO2 of the facility ２ The power management system according to claim 10 , wherein whether to use the first calculation method or the second calculation method is determined based on an amount of energy emitted.

12. The electric vehicles are installed in a facility, and the calculation unit calculates the CO₂ of the plurality of electric vehicles in the plurality of facilities. ２ The power management system according to claim 10 , further comprising: calculating a total value of emissions; and determining whether to use the first calculation method or the second calculation method based on the calculated total value.

13. The electric vehicle is installed in a facility, and the calculation unit calculates the CO2 of the facility at each of the plurality of facilities. ２ The power management system according to claim 10 , further comprising: calculating a total value of emissions; and determining whether to use the first calculation method or the second calculation method based on the calculated total value.

14. The distributed power sources and the electric vehicles are installed in a facility, and the calculation unit calculates the CO₂ of a plurality of the electric vehicles in a plurality of the facilities. ２ The total amount of CO emissions at each of the facilities ２ The power management system according to claim 10 , further comprising: comparing the calculated value of the first calculation method with a total value of the emission amount; and determining whether to use the first calculation method or the second calculation method based on a result of the comparison.

15. A power management method executed by a power management system that manages the power of an electric vehicle and a distributed power source, wherein the distributed power source, the electric vehicle, and a power grid are electrically connected, a generated power value of the distributed power source is acquired, a purchased power value from the power grid is acquired, a first charging power value for the electric vehicle is acquired, and different CO2 values ​​are calculated for the generated power value and the purchased power value. ２ a second charging power value derived from power generation, which is a smaller power value of a power value based on the generated power value and the first charging power value; and a first CO emission coefficient corresponding to the generated power. ２ Based on the emission factor, the first CO ２ a third charging power value derived from the grid, which is a power value obtained by subtracting the second charging power value derived from power generation from the first charging power value, and a second CO2 emission amount corresponding to purchased power. ２ Based on the emission factor, the second CO ２ Calculate the amount of CO2 emitted from power generation. ２ Emissions and the second CO ２ CO emissions of the electric vehicle based on ２ Calculating emissions. Power management methods.

16. A program for causing a computer to execute the power management method according to claim 15.

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