Power measurement system

Abstract

To calculate the charging and discharging power amount of an electric vehicle with relatively high accuracy regardless of baseline fluctuations.SOLUTION: A server 200 uses the amount of electricity measured by a smart meter 30 to totalize the total home power amount THE. A server 100 acquires charging / discharging information of an electric vehicle 40. A server 300 estimates domestic power amount NHE, which is the power amount obtained by subtracting the charging / discharging power of the electric vehicle 40 from the total home power amount THE, and compares a first vehicle charging / discharging amount VEs, which is obtained by subtracting the domestic power amount NHE from the total home power amount THE, and a second vehicle heavy use power amount VEv calculated from the charging / discharging information of the electric vehicle 40 to calculate the final vehicle charging / discharging amount VEn.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an electric power measurement system, and more particularly to an electric power measurement system that measures the amount of electric power exchanged between a power grid and an electric vehicle. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2021-125939 (Patent Document 1) discloses that the amount of power related to charging and discharging an electric vehicle is calculated using the amount of power measured by a smart meter. In this Patent Document 1, when a baseline indicating the power consumption of electrical equipment other than the electric vehicle is constant, a calibration line is obtained that indicates the relationship between the measurement value of the smart meter and the power amount command value (charge and discharge command value) for the charging and discharging equipment (power conversion device) of the electric vehicle, and the amount of power related to charging and discharging the electric vehicle is calculated using this calibration line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-125939 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a calibration line is obtained when a baseline indicating the power consumption of electrical devices other than the electric vehicle is constant, and the charging and discharging power of the electric vehicle is calculated using this calibration line. In order to obtain the calibration line, it is necessary to plot the relationship between the measurement value of the smart meter and the charging and discharging command value to create an approximation line. In a home, electrical devices connected to a smart meter (electrical energy is measured by the smart meter) are diverse, such as air conditioners, refrigerators, cooking appliances, washer-dryers, AV (Audio Visual) devices, lighting devices, water heaters, vacuum cleaners, etc., so the baseline does not frequently become constant. For this reason, it is desired to accurately calculate the charging and discharging power of the electric vehicle even if the baseline fluctuates.

[0005] Therefore, an object of the present disclosure is to make it possible to calculate the amount of charge / discharge power of an electric vehicle with relatively high accuracy, regardless of fluctuations in the baseline. [Means for solving the problem]

[0006] The power measurement system according to the present disclosure includes a power meter that measures the amount of power exchanged between a power grid and a facility, an electric vehicle that is connected to a charge / discharge device provided in the facility and performs charging / discharging, and a server configured to be able to communicate with the system. The server includes a total power amount acquisition means that acquires a total amount of power exchanged at the facility based on the amount of power measured by the power meter, an in-facility power amount estimation means that estimates an in-facility power amount that is the amount of power exchanged at the facility minus the amount of charge / discharge power of the electric vehicle from the total amount of power exchanged at the facility, a charge / discharge information acquisition means that acquires electric vehicle charge / discharge information from the electric vehicle, a first vehicle charge / discharge amount acquisition means that acquires a first vehicle charge / discharge amount that is the amount of charge / discharge power of the electric vehicle by subtracting the in-facility power amount from the total amount of power, a second vehicle charge / discharge amount calculation means that calculates a second vehicle charge / discharge amount that is the amount of charge / discharge power of the electric vehicle using the charge / discharge information, and a final vehicle charge / discharge amount calculation means that calculates a final vehicle charge / discharge amount that is the amount of charge / discharge power of the electric vehicle based on the first vehicle charge / discharge amount and the second vehicle charge / discharge amount.

[0007] According to this configuration, the watt-hour meter measures the amount of power exchanged between the power grid and the facility, and is capable of communicating the measurement results to the server. The watt-hour meter may be a smart meter consisting of an electronic watt-hour meter. The facility may be in any form, and may be a house, a business establishment, a commercial facility, a factory, an airport, a recreational facility, or the like. The facility is provided with a charging / discharging device that charges and discharges the electric vehicle, and the charging / discharging device can be used to charge and discharge the power storage device mounted on the electric vehicle. The electric vehicle is configured to be able to communicate with the server, and the server is capable of receiving charging / discharging information about the electric vehicle.

[0008] The server includes a total power amount acquiring means, an in-facility power amount estimating means, a charge / discharge information acquiring means, a first vehicle charge / discharge amount acquiring means, a second vehicle charge / discharge amount calculating means, and a final vehicle charge / discharge amount calculating means.

[0009] The total electric energy acquisition means acquires the total amount of electric energy exchanged within the facility by receiving the amount of electric energy measured by the power meter. The in-facility electric energy estimation means estimates the in-facility electric energy, which is the amount of electric energy obtained by subtracting the amount of electric energy charged and discharged by the electric vehicle from the total amount of electric energy exchanged within the facility. The charge / discharge information acquisition means acquires charge / discharge information about the electric vehicle.

[0010] The first vehicle charge / discharge amount acquisition means acquires a first vehicle charge / discharge amount, which is the amount of charge / discharge power of the electric vehicle, by subtracting the in-facility power amount estimated by the in-facility power amount estimation means from the total power amount acquired by the total power amount acquisition means. The second vehicle charge / discharge amount calculation means calculates a second vehicle charge / discharge amount, which is the amount of charge / discharge power of the electric vehicle, by using the charge / discharge information.

[0011] The final vehicle charge / discharge amount calculation means calculates a final vehicle charge / discharge amount, which is the amount of electric power charged / discharged to the electric vehicle, based on the first vehicle charge / discharge amount and the second vehicle charge / discharge amount. For example, if the difference between the first vehicle charge / discharge amount and the second vehicle charge / discharge amount is within a predetermined range, the first vehicle charge / discharge amount is set as the final vehicle charge / discharge amount. If the difference between the first vehicle charge / discharge amount and the second vehicle charge / discharge amount is greater than the predetermined range, a value obtained by correcting the second vehicle charge / discharge amount based on the magnitude of the difference between the first vehicle charge / discharge amount and the second vehicle charge / discharge amount is set as the final vehicle charge / discharge amount.

[0012] The first vehicle charge / discharge amount is a value based on the amount of power measured by an electricity meter, and the second vehicle charge / discharge amount is a value calculated from charge / discharge information acquired from the electric vehicle. Since the final vehicle charge / discharge amount is calculated based on these values, it is possible to prevent the final vehicle charge / discharge amount from deviating significantly from the amount of charge / discharge power of the electric vehicle, and it is possible to calculate the amount of charge / discharge power of the electric vehicle with relatively high accuracy regardless of fluctuations in the baseline. Effect of the Invention

[0013] According to the present disclosure, the amount of charge / discharge power of an electric vehicle can be calculated with relatively high accuracy regardless of fluctuations in the baseline. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram illustrating an overall configuration of a power system according to an embodiment of the present invention. [Diagram 2] 13 is a flowchart showing an example of a process executed by the server 200. [Diagram 3] 1A to 1D are diagrams for explaining amounts of power etc. that are tallied or calculated in the servers 100 to 300. [Figure 4] 4 is a flowchart showing an example of a process executed by the server 100. [Diagram 5] 13 is a flowchart showing an example of a process executed by the server 300. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference characters, and the description thereof will not be repeated.

[0016] Fig. 1 is a diagram showing a schematic overall configuration of a power system according to the present embodiment. As shown in Fig. 1, the power system 1 includes a house 10, a power network 20, a smart meter 30, an electric vehicle 40, a server 100, a server 200, and a server 300. The house 10 corresponds to an example of a "facility" in the present disclosure.

[0017] The power grid 20 is a power system consisting of power plants, transmission lines, substations, distribution lines, etc., and is a power grid managed by a power retailer, etc. The power grid 20 and the in-house power lines of the house 10 are connected via a smart meter 30. The smart meter 30 is an electronic power meter with a communication function, which measures the amount of power exchanged between the power grid 20 and the house 10 during a predetermined measurement period (e.g., 30 minutes), and transmits the measured amount of power together with an identification code (ID) of the smart meter 30 to the server 200 at predetermined intervals (e.g., every 60 minutes).

[0018] In a house 10 connected to a power grid 20 via a smart meter 30, various electrical appliances such as an air conditioner (heating and cooling device) 13, a heat pump water heater 14, a power storage device 15, a solar power generation device 16, and a charging / discharging device 17 are connected using in-house power lines via a distribution board 12. This makes it possible to consume power supplied from the power grid 20, and to supply (reverse power flow) power generated by the solar power generation device 16 and power discharged from an electric vehicle 40 to the power grid 20.

[0019] The charging / discharging device 17 is connected to the electric vehicle 40 via a cable, thereby making it possible to charge the power storage device of the electric vehicle 40 and to reverse flow the power discharged from the electric vehicle 40 to the power grid 20.

[0020] The electric vehicle 40 is a Battery Electric Vehicle (BEV) equipped with a storage battery (electricity storage device) not shown. However, the type of the electric vehicle 40 may be any vehicle that can be connected to the charge / discharge device 17, and may be a plug-in hybrid electric vehicle (PHEV) or a plug-in fuel cell electric vehicle (FCEV).

[0021] The electric vehicle 40 includes a control device (ECU: Electronic Control Unit), a monitoring unit, and a communication device (none of which are shown). The monitoring unit detects the input / output current IB of the storage battery, the terminal voltage VB of the storage battery, the temperature TB of the storage battery, and the like. The control device calculates the SOC (State of Charge) of the storage battery and the charge / discharge power amount of the storage battery from the input / output current IB and the terminal voltage VB, and the like. The control device also transmits charge / discharge information such as the SOC, charge / discharge power amount, charge / discharge time (charge / discharge start time, end time), charge / discharge mode, charge / discharge instruction value, and rated output of the connected charge / discharge device 17, together with an identification code (ID) of the electric vehicle 40, to the server 100 at predetermined intervals (for example, every 60 minutes) via the communication device. The transmitted SOC information may be an average value of the SOC and a change amount of the SOC for a predetermined measurement period (for example, 30 minutes), and the transmitted charge / discharge power amount may be the power amount [kWh] for the predetermined measurement period.

[0022] Server 100 is a server that collects charging and discharging information of electric vehicle 40, and in this embodiment, is a server that belongs to the automobile company that manufactured and sold electric vehicle 40. Server 100 is composed of a control unit, a storage unit, and a communication unit (none of which are shown). The control unit communicates with electric vehicle 40, server 200, server 300, etc. via the communication unit, and executes a predetermined calculation based on the received information, as well as storing and memorizing various data in the storage unit.

[0023] The server 200 is a server that tally up the amount of power measured by the smart meter 30, and in this embodiment, is a server that belongs to an electricity retailer or the like. The server 200 is composed of a control unit, a storage unit, and a communication unit (none of which are shown in the figures). The control unit communicates with the smart meter 30, the server 100, the server 300, etc. via the communication unit, and executes a predetermined calculation based on the received information, and stores various data in the storage unit.

[0024] Server 300 is a server for calculating the charge / discharge power amount of electric vehicle 40, and is composed of a control unit, a storage unit, and a communication unit (none of which are shown in the figures). The control unit communicates with servers 100 and 200, etc., via the communication unit, executes a predetermined calculation based on the received information, and stores the calculation results, etc., in the storage unit.

[0025] In this embodiment, the power measurement system is made up of server 100, server 200, and server 300. FIG. 2 is a flowchart showing an example of processing executed by server 200. This flowchart is repeatedly processed at predetermined time intervals. In step (hereinafter, step is abbreviated as "S") 201, it is determined whether or not a measurement result of the amount of power has been received from smart meter 30. If the amount of power has been received from smart meter 30, a positive determination is made and the process proceeds to S202. If the amount of power has not been received from smart meter 30, a negative determination is made and the current routine is terminated.

[0026] In S202, the total household power amount THE is tallied based on the received power amount. FIG. 3 is a diagram for explaining the power amount tallied or calculated in the servers 100 to 300. FIG. 3(A) shows an example of the total household power amount THE, which is the amount of power tallied for every 60 minutes (one hour). The solid line is the total household power amount THE. The amount of power exchanged between the power grid 20 and the house 10 for 30 minutes (predetermined measurement period) is transmitted from the smart meter 30 every 60 minutes (every predetermined period) together with the ID of the smart meter 30. In S202, the total household power amount THE is stored in the storage unit for each smart meter 30 using the ID of the smart meter 30. The amount of power is stored in the storage unit for each 30 minutes. The amount of power measured and transmitted by the smart meter 30 is the amount of power exchanged between the power grid 20 and the house 10, so the total household power amount THE includes the amount of power charged and discharged by the electric vehicle 40 connected to the charging / discharging device 17. In this embodiment, the amount of power supplied from power grid 20 to home 10 (consumed by home 10) is taken as a positive value, and the amount of power flowing back from home 10 to power grid 20 is taken as a negative value.

[0027] 4 is a flowchart showing an example of processing executed by the server 100. This flowchart is repeatedly processed at predetermined time intervals. In S101, it is determined whether or not charging / discharging information has been received from the electric vehicle 40. If charging / discharging information has been received from the electric vehicle 40, a positive determination is made and the process proceeds to S102. If charging / discharging information has not been received, a negative determination is made and the current routine is terminated.

[0028] In S102, the charge / discharge data VI is compiled using the received charge / discharge information of the electric vehicle 40. The charge / discharge information is transmitted from the electric vehicle 40 every 60 minutes (every predetermined period) together with the ID of the electric vehicle 40. As described above, the charge / discharge information transmitted from the electric vehicle 40 includes a lot of data such as SOC, but in this embodiment, the charge / discharge data VI is compiled using the charge / discharge time (charge / discharge start time, end time) and the charge / discharge mode. In S102, the charge / discharge data VI is compiled for each electric vehicle 40 using the ID of the electric vehicle 40 and stored in the storage unit. FIG. 3(C) shows an example of the compiled charge / discharge data VI, and in this embodiment, the charge / discharge data VI is the charge / discharge time. FIG. 3(C) shows an example in which the charge / discharge mode is "charging", the charge start time is 18:10, and the end time is 21:20. The charge / discharge information transmitted from electric vehicle 40 is not limited to the charge start time and charge end time, and may be time data such as "charging for 50 minutes between 18:00 and 19:00", "charging for 60 minutes between 19:00 and 20:00", "charging for 60 minutes between 20:00 and 21:00", and "charging for 20 minutes between 21:00 and 22:00". The charge / discharge data VI is not limited to the charge / discharge time, and may be information on the SOC or the amount of charge / discharge power at each time.

[0029] 5 is a flowchart showing an example of a process executed by the server 300. This flowchart is executed when a predetermined condition is met. The predetermined condition is the timing for calculating the amount of charge / discharge power of the electric vehicle 40, and may be, for example, when the amount of charge / discharge power is measured for power trading, or may be a predetermined time every day (for example, 1:00).

[0030] In S301, the home electric energy NHE is estimated, which is the amount of electric energy obtained by subtracting the amount of electric energy charged and discharged by the electric vehicle 40 from the amount of electric energy measured by the smart meter 30 (i.e., the total home electric energy THE). In this embodiment, the home electric energy NHE is estimated using the average value of the amount of electric energy measured by the smart meter 30 during the past year at the time when the electric vehicle 40 was not charged or discharged. In S301, first, the total result of the home electric energy THE stored in the storage unit of the server 200 is acquired by receiving it from the server 200. In this embodiment, the home electric energy THE is totaled by dividing one day (24 hours) into 48 frames, each frame being 30 minutes, such as "0:00 to 0:30," "0:30 to 1:00," and "1:00 to 1:30." Then, the average value of the home electric energy THE (the amount of electric energy measured by the smart meter 30) during the time frames during which the electric vehicle 40 was not charged or discharged during the past year is estimated as the home electric energy NHE. FIG. 3(B) shows the household electric energy NHE estimated in this way. In FIG. 3(B), the amount of electric energy (household electric energy NHE) for every 60 minutes (1 hour) is displayed, similarly to FIG. 3(A). In S301, the household electric energy NHE is estimated for each ID of the smart meter 30, and the estimated household electric energy NHE is stored in the storage unit. The number of past data of electric energy for calculating the average value is arbitrary, and may be the past three months. Also, the average value may be calculated using the latest total household electric energy THE so that the number of past data of electric energy in each frame is, for example, 40.

[0031] In the next S302, the first vehicle charge / discharge amount VEs is calculated by subtracting the home electric energy NHE from the total home electric energy THE. The total home electric energy THE for the day on which the charge / discharge power is measured is acquired from the server 200 by communication, and the first vehicle charge / discharge amount VEs is calculated by subtracting the electric energy of each frame (each time) of the home electric energy NHE from the electric energy of each frame (each time) of the total home electric energy THE. In FIG. 3(A), the shaded portion corresponds to the first vehicle charge / discharge amount VEs. In S302, the first vehicle charge / discharge amount VEs is calculated for each ID of the smart meter 30, and the calculated first vehicle charge / discharge amount VEs is stored in the storage unit.

[0032] In S303, the second vehicle charge / discharge amount VEv is calculated from the charge / discharge data VI. The server 300 acquires the tabulated result of the charge / discharge data VI stored in the storage unit of the server 100 through communication. The server 300 also acquires the rated output of the charge / discharge device 17 stored in the storage unit of the server 100 through communication. In this embodiment, the charge / discharge data VI is the charge / discharge time, so the second vehicle charge / discharge amount VEv is calculated by multiplying the charge / discharge time by the rated output of the charge / discharge device 17. The second vehicle charge / discharge amount VEv is the charge / discharge power calculated using the charge / discharge information transmitted from the electric vehicle 40. An example of the charge / discharge data VI shown in FIG. 3(C) is the charge time. Therefore, in this example, the second vehicle charge / discharge amount VEv is calculated by multiplying the charge time in FIG. 3(C) by the rated output of the charging power of the charge / discharge device 17. FIG. 3(D) shows the second vehicle charge / discharge amount VEv calculated in this manner. In S303, the second vehicle charge / discharge amount VEv is calculated for each ID of the electric vehicle 40, and the calculated second vehicle charge / discharge amount VEv is stored in the storage unit.

[0033] In the next S304, the first vehicle charge / discharge amount VEs is compared with the second vehicle charge / discharge amount VEv to calculate a final vehicle charge / discharge amount VEn. The ID of the smart meter 30 that measures the amount of power of the charging / discharging device 17 (house 10) to which the electric vehicle 40 is connected is linked in advance with the ID of the electric vehicle 40. The server 300 calculates the final vehicle charge / discharge amount VEn related to the ID by comparing the first vehicle charge / discharge amount VEs of the smart meter 30 and the second vehicle charge / discharge amount VEv of the electric vehicle 40, which have the linked ID. In this embodiment, when the deviation (|VEs-VEv|) between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv is within a predetermined range α (|VEs-VEv|≦α), the first vehicle charge / discharge amount VEs is calculated as the final vehicle charge / discharge amount VEn (VEn=VEs).

[0034] When the deviation between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv falls outside a predetermined range α (|VEs-VEv|>α), a corrected value of the second vehicle charge / discharge amount VEv is calculated as the final vehicle charge / discharge amount VEn. For example, the magnitude of SOC (SOC level) and the amount of SOC change at the frame (time) of the charge / discharge time of the ID are acquired from the server 100 by communication. Then, the second vehicle charge / discharge amount VEv is corrected using a preset correlation between the SOC level and the amount of SOC change and the deviation (|VEs-VEv|) between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv to calculate the final vehicle charge / discharge amount VEn. For example, the smaller the amount of SOC change and the larger the deviation (|VEs-VEv|) between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv, the more the second vehicle charge / discharge amount VEv is corrected to decrease. In S304, the final vehicle charge / discharge amount VEn is calculated for each associated ID, the calculated final vehicle charge / discharge amount VEn is stored in the storage unit, and the current routine is terminated.

[0035] According to this embodiment, the total household power amount THE is calculated based on the amount of power measured by the smart meter 30, and the total household power amount THE at the time when the electric vehicle 40 is not being charged or discharged is used to estimate the household power amount NHE, which is the amount of power obtained by subtracting the charging and discharging power of the electric vehicle 40 from the total amount of power transferred to and from the house 10. Then, the first vehicle charge / discharge amount VEs is calculated by subtracting the household power amount NHE from the total household power amount THE. In addition, the charge / discharge data VI, which is charge / discharge information of the electric vehicle 40, is calculated, and the second vehicle charge / discharge amount VEv is calculated based on the charge / discharge data VI. Then, the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv are compared, and if the deviation (|VEs-VEv|) between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv is within a predetermined range, the first vehicle charge / discharge amount VEs is adopted as the final vehicle charge / discharge amount VEn. When the deviation (|VEs-VEv|) between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv is greater than a predetermined range, a value corrected for the second vehicle charge / discharge amount VEv based on the magnitude of the deviation (|VEs-VEv|) is calculated as the final vehicle charge / discharge amount VEn.

[0036] The first vehicle charge / discharge amount VEs is a value based on the amount of power measured by the smart meter 30, and the second vehicle charge / discharge amount VEv is a value calculated from charge / discharge information acquired from the electric vehicle 40. Since the final vehicle charge / discharge amount VEn is calculated based on these values, it is possible to prevent the final vehicle charge / discharge amount VEn from deviating significantly from the amount of charge / discharge power of the electric vehicle 40, and it is possible to calculate the amount of charge / discharge power of the electric vehicle 40 with relatively high accuracy regardless of fluctuations in the baseline. In addition, the final vehicle charge / discharge amount VEn is calculated based on the amount of power metered (measured) by the smart meter 30. Therefore, by performing electricity trading using the final vehicle charge / discharge amount VEn, it is possible to increase the possibility of satisfying requirements such as inspection methods in the measure (specified metering system) for streamlining the electricity metering system.

[0037] Note that the processing of S202 in FIG. 2 corresponds to the "total power amount acquisition means" of the present disclosure, the processing of S301 in FIG. 5 corresponds to the "in-facility power estimation means" of the present disclosure, the processing of S102 in FIG. 4 corresponds to the "charging information acquisition means" of the present disclosure, the processing of S302 in FIG. 5 corresponds to the "first vehicle charge / discharge amount acquisition means" of the present disclosure, the processing of S303 corresponds to the "second vehicle charge / discharge amount calculation means" of the present disclosure, and the processing of S304 corresponds to the "final vehicle charge / discharge amount calculation means" of the present disclosure.

[0038] In the above embodiment, in S301 (FIG. 5), the domestic power amount NHE is estimated from the average value of the total household power amount THE (power amount measured by the smart meter 30) in the frames in which the electric vehicle 40 was not charged or discharged during the past year. However, the method of estimating the domestic power amount NHE is not limited to this. For example, the power amount for one day (24 frames) obtained by subtracting the second vehicle charge / discharge amount VEv from the total household power amount THE tallied in S202 (FIG. 2) may be averaged using "High 4 of 5" (the average of the four days with the highest power amount out of the most recent five days), and the averaged power amount may be used as the domestic power amount NHE. In addition, the total household power amount THE of a general house not equipped with a charge / discharge device 17 may be adopted as the domestic power amount NHE.

[0039] In the above embodiment, in S303 (FIG. 5), the second vehicle charge / discharge amount VEv is calculated by multiplying the charge / discharge time of the electric vehicle 40 by the rated output of the charge / discharge device 17. However, the method of calculating the second vehicle charge / discharge amount VEv is not limited to this. For example, the second vehicle charge / discharge amount VEv may be calculated from the input / output current IB and the terminal voltage VB of the storage battery detected by a monitoring unit provided in the electric vehicle 40. In this case, when the deviation between the first vehicle charge / discharge amount VEs and the second vehicle charge / discharge amount VEv falls outside the predetermined range α (|VEs-VEv|>α), the loss of the charge / discharge device 17 and the power conversion circuit of the electric vehicle 40 may be found from the correlation with the first vehicle charge / discharge amount VEs, and the second vehicle charge / discharge amount VEv may be corrected to calculate the final vehicle charge / discharge amount VEn.

[0040] In the above embodiment, S301 and S302 (FIG. 5) use the total household power amount THE obtained by aggregating the amount of power measured by the smart meter 30. By using a distribution board 12 that is compatible with a HEMS (Home Energy Management Service), the total household power amount THE may be calculated by aggregating the amount of power measured by a distribution board or the like that is compatible with the HEMS (the amount of power measured by a so-called HEMS device arranged on route B) instead of the amount of power measured by the smart meter 30. Furthermore, the charge / discharge information of the electric vehicle 40 obtained in S101 may be obtained via the HEMS.

[0041] The charging / discharging device 17 in the above embodiment may be a V2H (Vehicle to Home) charging / discharging facility, and may be configured to acquire charging / discharging information of the electric vehicle 40 via the V2H charging / discharging facility. The charging / discharging device 17 may be a charging / discharging device (charging device) that is compatible only with the charging mode, in which case the electric vehicle 40 only performs charging. In the present disclosure, the "charging / discharging device" includes a charging / discharging device (charging device) that is compatible only with the charging mode.

[0042] In the above embodiment, the charge / discharge power amount of the electric vehicle 40 is calculated using the server 300, but the functions of the server 300 may be integrated into the server 100 or the server 200. Furthermore, the functions of the servers 100 to 300 may be integrated into one server.

[0043] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0044] 1 Power system, 10 House, 12 Distribution board, 13 Air conditioner, 14 Heat pump water heater, 15 Energy storage device, 16 Photovoltaic power generation device, 17 Charging and discharging device, 20 Power grid, 30 Smart meter, 40 Electric vehicle, 100 Server, 200 Server, 300 Server.

Claims

[Claim 1] The system includes a power meter that measures the amount of power exchanged between a power grid and a facility, an electric vehicle that is connected to a charging / discharging device provided in the facility and charges and discharges the electric vehicle, and a server configured to be able to communicate with the electric vehicle, The server, a total power amount acquiring means for acquiring a total amount of power exchanged in the facility based on the amount of power measured by the watt-hour meter; an in-facility power amount estimation means for estimating an in-facility power amount, which is an amount of power obtained by subtracting an amount of power charged and discharged by the electric vehicle from a total amount of power exchanged in the facility; a charge / discharge information acquisition means for acquiring charge / discharge information of the electric vehicle from the electric vehicle; a first vehicle charge / discharge amount acquisition means for acquiring a first vehicle charge / discharge amount which is a charge / discharge power amount of the electric vehicle by subtracting the in-facility power amount from the total power amount; a second vehicle charge / discharge amount calculation means for calculating a second vehicle charge / discharge amount, which is a charge / discharge power amount of the electric vehicle, by using the charge / discharge information; a final vehicle charge / discharge amount calculation means for calculating a final vehicle charge / discharge amount, which is an amount of charge / discharge electricity of the electric vehicle, based on the first vehicle charge / discharge amount and the second vehicle charge / discharge amount.

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