Measurement accuracy management system, management device, management method, management program, and charging / discharging device

Abstract

This measurement accuracy management system comprises: a charging / discharging device for charging / discharging a battery; a management device; and a reference measurement unit that measures power in an electric wire. The charging / discharging device includes a target measurement unit that measures charging / discharging power. The management device includes a first acquisition unit that acquires a reference measurement value from the reference measurement unit and a second acquisition unit that acquires a target measurement value from the target measurement unit. The measurement accuracy management system is provided with: a determination unit that determines, on the basis of the reference measurement value and the target measurement value, whether or not calibration for the target measurement unit is needed to be executed; and an instruction unit that, when the determination unit has determined that the calibration for the target measurement unit is needed to be executed, transmits instruction information for instructing execution of the calibration. The charging / discharging device includes a control unit that executes the calibration for the target measurement unit on the basis of the instruction information transmitted from the instruction unit.

Description

Technical Field

[0001] The present disclosure relates to a measurement accuracy management system, a management device, a management method, a management program, and a charge / discharge device.

Background Art

[0002] In Patent Document 1, equipment such as a gas water heater, an electric water heater, and an air conditioner in a house detects an operation characteristic value of the equipment, determines a failure risk of the equipment based on the detected operation characteristic value, and an equipment management server generates a failure prediction time when the equipment is predicted to fail and a probability that the equipment will fail by the failure prediction time based on the failure risk, and an input / output device provided in the house displays the failure prediction time and the probability that the equipment will fail. An equipment management system is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] A measurement accuracy management system according to one aspect of the present disclosure comprises: a charge / discharge device that charges and discharges a battery through electrical wiring connected to a grid power supply; a management device that manages the power consumption of a load connected to the electrical wiring and the charge / discharge power of the charge / discharge device; and a reference measurement unit that measures power in the electrical wiring, wherein the charge / discharge device includes a target measurement unit that measures the charge / discharge power of the battery; the management device includes a first acquisition unit that acquires a reference measurement value which is a power measurement value by the reference measurement unit, and a second acquisition unit that acquires a target measurement value which is a power measurement value of the battery by the target measurement unit; the measurement accuracy management system comprises a determination unit that determines whether or not calibration of the target measurement unit is necessary based on the reference measurement value acquired by the first acquisition unit and the target measurement value acquired by the second acquisition unit; and an instruction unit that transmits instruction information instructing the execution of the calibration when the determination unit determines that calibration of the target measurement unit is necessary; and the charge / discharge device includes a calibration execution unit that performs calibration of the target measurement unit based on the instruction information transmitted from the instruction unit.

[0005] This disclosure can be implemented not only as a measurement accuracy management system having the characteristic configuration described above, but also as a management device included in a measurement accuracy management system, or as a management method that uses characteristic processing in the management device as steps. This disclosure can be implemented as a computer program that makes a computer function as a management device, as part or all of the management device as a semiconductor integrated circuit, or as a charge / discharge device included in a measurement accuracy management system. [Brief explanation of the drawing]

[0006] [Figure 1] Figure 1 shows an example of the overall configuration of the measurement accuracy management system according to the embodiment. [Figure 2] Figure 2 is a block diagram showing an example of the configuration of a power conversion device according to this embodiment. [Figure 3] Figure 3 is a block diagram showing an example of the hardware configuration of a charge / discharge device according to this embodiment. [Figure 4] Figure 4 is a circuit diagram showing an example of the configuration of a power conversion circuit in a charge / discharge device. [Figure 5] Figure 5 is a block diagram showing an example of the hardware configuration of the management device according to the embodiment. [Figure 6] Figure 6 is a functional block diagram showing an example of the functions of the measurement accuracy management system according to the embodiment. [Figure 7] Figure 7 shows an example of a notification screen. [Figure 8] Figure 8 is a sequence diagram showing an example of the overall operation of the measurement accuracy management system according to the embodiment. [Figure 9] Figure 9 is a flowchart showing an example of the processing of the management device according to the embodiment. [Modes for carrying out the invention]

[0007] <Issues this disclosure aims to address> The decentralization of power sources is progressing, not only using grid power but also utilizing solar power generation, storage batteries, electric vehicles, and other sources. It is anticipated that households will trade electricity from these decentralized sources with aggregators (businesses that collect electricity from decentralized sources and supply the aggregated electricity to consumers). For such electricity trading to be possible, it is necessary to accurately measure the electricity supplied from decentralized sources.

[0008] <Effects of this disclosure> According to this disclosure, the accuracy of power measurement in a charging and discharging device can be controlled.

[0009] <Summary of the embodiments of this disclosure> The embodiments of this disclosure are outlined below.

[0010] (1) The measurement accuracy management system according to this embodiment comprises: a charge / discharge device that charges and discharges a battery through electrical wiring connected to a grid power supply; a management device that manages the power consumption of a load connected to the electrical wiring and the charge / discharge power of the charge / discharge device; and a reference measurement unit that measures power in the electrical wiring, wherein the charge / discharge device includes a target measurement unit that measures the charge / discharge power of the battery; the management device includes a first acquisition unit that acquires a reference measurement value which is a power measurement value by the reference measurement unit, and a second acquisition unit that acquires a target measurement value which is a power measurement value of the battery by the target measurement unit; the measurement accuracy management system comprises a determination unit that determines whether or not calibration of the target measurement unit is necessary based on the reference measurement value acquired by the first acquisition unit and the target measurement value acquired by the second acquisition unit; and an instruction unit that transmits instruction information to instruct the execution of the calibration when the determination unit determines that calibration of the target measurement unit is necessary; and the charge / discharge device includes a calibration execution unit that performs calibration of the target measurement unit based on the instruction information transmitted from the instruction unit. This allows for calibration of the target measurement unit if the measurement accuracy of the power measurement unit has deteriorated. Therefore, the accuracy of power measurement in the charge / discharge device can be controlled. Power is determined by voltage and current. That is, the power value is calculated from the voltage value and the current value. The "measured power value" here includes not only the measured power value itself, but also the combination of the measured voltage value and the measured current value.

[0011] (2) In (1) above, the reference measurement unit includes a reference voltage sensor for measuring the voltage in the electrical wiring and a reference current sensor for measuring the current in the electrical wiring, the target measurement unit includes a target voltage sensor for measuring the charge / discharge voltage of the battery and a target current sensor for measuring the charge / discharge current of the battery, and the determination unit may perform a first determination process to determine whether calibration of the target measurement unit is necessary based on a reference voltage value which is the voltage value measured by the reference voltage sensor and a target voltage value which is the voltage value measured by the target voltage sensor, and a second determination process to determine whether calibration of the target measurement unit is necessary based on a reference current value which is the current value measured by the reference current sensor and a target current value which is the current value measured by the target current sensor.

[0012] (3) In (2) above, the instruction information includes a calibration voltage value based on the voltage value measured by the reference voltage sensor and a calibration current value based on the current value measured by the reference current sensor, and the calibration execution unit may perform calibration of the target voltage sensor based on the calibration voltage value and calibration of the target current sensor based on the calibration current value. By performing calibration of the target voltage sensor and the target current sensor respectively, a decrease in the measurement accuracy of the target voltage sensor and the target current sensor can be suppressed.

[0013] (4) In any one of (1) to (3) above, the reference measurement value may be a measurement value of the power supplied from the grid power supply or the power flowed back into the grid power supply. This makes it possible to determine whether calibration of the target measurement unit is necessary based on the measurement value of the power supplied from the grid power supply or the power flowed back into the grid power supply.

[0014] (5) In the above (4), the reference measurement unit may be a smart meter. Thereby, it is possible to determine whether calibration of the target measurement unit is necessary using a smart meter having high measurement accuracy.

[0015] (6) In the above (4) or (5), the measurement accuracy management system further includes a calculation unit that calculates a charge / discharge power value charged or discharged by the charge / discharge device based on the power consumption value of the load connected to the electrical wiring and the reference measurement value. The determination unit may determine whether it is necessary to execute calibration of the target measurement unit based on a comparison between the charge / discharge power value calculated by the calculation unit and the target measurement value. Thereby, it is possible to determine whether calibration of the target measurement unit is necessary using an accurate charge / discharge power value calculated based on the measured value of the supply power or reverse power flow from the grid power supply and the power consumption value of the load.

[0016] (7) In the above (6), the power consumption value of the load may be selected from a plurality of statistical values of the power consumption value of the load calculated for each period in a year. The power consumption of the load varies according to the period in a year. Therefore, the charge / discharge power value by the charge / discharge device can be accurately calculated using the selected statistical value.

[0017] (8) In the above (6) or (7), the power consumption value of the load is the power consumption value of the load in a specific time period in a day, the first acquisition unit acquires the reference measurement value measured by the reference measurement unit in the specific time period, and the second acquisition unit may acquire the target measurement value measured by the target measurement unit in the specific time period. Thereby, it is possible to accurately determine whether calibration of the target measurement unit is necessary using the reference measurement value and the target measurement value measured in a specific time period.

[0018] (9) In the above (8), the specific time period may be at night. Since the power consumption of the load is low at night, it is possible to more accurately determine whether calibration of the target measurement unit is necessary.

[0019] (10) In any one of (6) to (9) above, the electrical wiring is connected to a power converter that converts the generated power by the generator, and the determination unit may calculate the charge / discharge power value based further on the output power value from the power converter. Thereby, even in a house equipped with a generator, it is possible to accurately determine whether calibration of the target measurement unit is necessary.

[0020] (11) In any one of (1) to (10) above, the charge / discharge device includes a charge / discharge control unit that charges or discharges the battery in a specific pattern, and the second acquisition unit may acquire the target measurement value that is the measured value of the charge / discharge power of the battery by the target measurement unit when the battery is charged or discharged in a specific pattern. Thereby, it is possible to accurately determine whether calibration of the target measurement unit is necessary using a pattern suitable for confirming the measurement accuracy by the target measurement unit.

[0021] (12) In any one of (1) to (11) above, the management device may include an output unit that outputs notification information for notifying the user that the calibration has been executed when the charge / discharge device executes the calibration of the target measurement unit. Thereby, the user is notified that the calibration has been executed, and the user can know that the accuracy of the power measurement in the target measurement unit of the charge / discharge device is being managed.

[0022] (13) In any one of (1) to (12) above, the management device may include the determination unit and the instruction unit. Thereby, the management device can determine whether calibration of the target measurement unit is necessary.

[0023] (14) In any one of (1) to (12) above, the charge / discharge device may include the determination unit and the instruction unit. Thereby, the charge / discharge device can determine whether calibration of the target measurement unit is necessary.

[0024] (15) In any one of (1) to (14) above, the battery may be an on-board battery installed in an electric vehicle. This makes it possible to control the accuracy of power measurement in the charging and discharging device of the on-board battery of an electric vehicle.

[0025] (16) The management device according to this embodiment is a management device for managing the power consumption of a load connected to an electrical wiring connected to a grid power supply, and the charge and discharge power of a charge and discharge device that charges and discharges a battery through the electrical wiring, and comprises: a first acquisition unit that acquires a reference measurement value which is a measured value of power by a reference measurement unit that measures power in the electrical wiring; a second acquisition unit that acquires a target measurement value which is a measured value of the charge and discharge power of the battery by a target measurement unit that measures the charge and discharge power of the charge and discharge device; a determination unit that determines whether or not calibration of the target measurement unit is necessary based on the reference measurement value acquired by the first acquisition unit and the target measurement value acquired by the second acquisition unit; and an instruction unit that transmits instruction information to perform the calibration when the determination unit determines that calibration of the target measurement unit is necessary. As a result, if the power measurement accuracy of the target measurement unit has deteriorated, calibration of the target measurement unit can be performed.

[0026] (17) The management method according to this embodiment is a management method used by a management device that manages the power consumption of a load connected to an electrical wiring connected to a grid power supply, and the charge and discharge power of a charge and discharge device that charges and discharges a battery through the electrical wiring, and includes the steps of: acquiring a reference measurement value which is a measured value of power by a reference measurement unit that measures power in the electrical wiring; acquiring a target measurement value which is a measured value of the charge and discharge power of the battery by a target measurement unit that measures the charge and discharge power of the charge and discharge device; determining whether or not it is necessary to perform calibration of the target measurement unit based on the acquired reference measurement value and the acquired target measurement value; and transmitting instruction information to instruct the execution of calibration when it is determined that it is necessary to perform calibration of the target measurement unit. As a result, if the power measurement accuracy of the target measurement unit has deteriorated, calibration of the target measurement unit can be performed.

[0027] (18) The management program according to this embodiment is a management program used by a management device that manages the power consumption of a load connected to electrical wiring connected to a grid power supply, and the charge and discharge power of a charge and discharge device that charges and discharges a battery through the electrical wiring, and causes a computer to perform the following steps: acquire a reference measurement value which is the power measurement value of the reference measurement unit that measures the power in the electrical wiring; acquire a target measurement value which is the power charge and discharge power of the battery measured by a target measurement unit that measures the charge and discharge power of the charge and discharge device; determine whether or not it is necessary to perform calibration of the target measurement unit based on the acquired reference measurement value and the acquired target measurement value; and, if it is determined that it is necessary to perform calibration of the target measurement unit, transmit instruction information to instruct the execution of the calibration. As a result, if the power measurement accuracy of the target measurement unit has deteriorated, calibration of the target measurement unit can be performed.

[0028] (19) The charge / discharge device according to this embodiment is a charge / discharge device that charges and discharges a battery through electrical wiring connected to a grid power supply, and comprises a target measurement unit that measures the charge / discharge power of the battery, and a calibration execution unit that performs calibration of the target measurement unit based on a determination result of whether or not calibration of the target measurement unit is necessary, based on a reference measurement value which is a power measurement value by a reference measurement unit that measures power in the electrical wiring, and a target measurement value which is a charge / discharge power measurement value of the battery by the target measurement unit. As a result, calibration of the target measurement unit of the charge / discharge device can be performed based on a determination result of whether or not calibration is necessary based on the reference measurement value and the target measurement value.

[0029] <Details of the embodiments of this disclosure> The embodiments of the present invention will be described in detail below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0030] [1. Measurement Accuracy Management System] Figure 1 shows an example of the overall configuration of a measurement accuracy management system according to an embodiment. The measurement accuracy management system 10 manages the accuracy of power measurement of a charging / discharging device 30 for the on-board battery of an electric vehicle 40, such as an electric vehicle, hybrid vehicle, or plug-in hybrid vehicle, which is propelled by the power of a motor. The measurement accuracy management system 10 is installed in a house 11. The measurement accuracy management system 10 includes the charging / discharging device 30, a management device 100, and a smart meter 50.

[0031] The charging / discharging device 30 is connected to the electrical wiring 20 installed in the house 11. The electrical wiring 20 is connected to the power grid and transmits AC power supplied from the power grid.

[0032] The electrical wiring 20 includes multiple ends, one of which extends to the outside of the house 11. A connector 21 is provided at the end outside the house 11. The charge / discharge device 30 can be connected to the connector 21. More specifically, a plug 31 provided on the charge / discharge device 30 can be inserted into the connector 21.

[0033] The charge / discharge device 30 has a plug 32 for connecting to the electric vehicle 40. The plug 32 can be inserted into an inlet provided on the electric vehicle 40. By connecting the plug 31 to the connector 21 and the plug 32 to the electric vehicle 40, the charge / discharge device 30 can charge and discharge the on-board battery of the electric vehicle 40.

[0034] The charging / discharging device 30 has a wireless communication function and is capable of performing wireless communication.

[0035] The electrical wiring 20 is connected to the power line 23 via the distribution board 22. The power line 23 is connected to the grid power supply.

[0036] At the distribution board 22, the electrical wiring 20 is branched. Power-consuming loads 60 such as televisions, refrigerators, washing machines, lighting, and air conditioners are connected to the electrical wiring 20.

[0037] The distribution board 22 is equipped with power measurement units 221 and 222.

[0038] The power measurement unit 221 is attached to the power line extending to the connector 21 to which the charge / discharge device 30 is connected. The power measurement unit 221 includes a voltage sensor 221V and a current sensor 221A. The power measurement unit 221 measures the power supplied to the charge / discharge device 30 or the power output from the charge / discharge device 30. That is, the power measurement unit 221 measures the charge / discharge power of the charge / discharge device 30. More specifically, the voltage sensor 221V measures the charge / discharge voltage of the charge / discharge device 30, and the current sensor 221A measures the charge / discharge current of the charge / discharge device 30. The charge / discharge power is calculated based on the voltage value measured by the voltage sensor 221V and the current value measured by the current sensor 221A. The calculation of the charge / discharge power is performed, for example, by a processor (not shown) provided in the power measurement unit 221.

[0039] The power measurement unit 222 is attached to the power line extending to the load 60. The power measurement unit 222 includes a voltage sensor 222V and a current sensor 222A. The power measurement unit 222 measures the power supplied to the load 60. That is, the power measurement unit 222 measures the power used by the load 60. More specifically, the voltage sensor 222V measures the voltage applied to the load 60 (hereinafter also referred to as "load voltage"), and the current sensor 222A measures the current supplied to the load 60 (hereinafter also referred to as "load current"). The power used by the load 60 is calculated based on the voltage value measured by the voltage sensor 222V and the current value measured by the current sensor 222A. For example, the power value is calculated by voltage value × current value × power factor (phase difference between current and voltage). The calculation of power used is performed, for example, by a processor (not shown) provided in the power measurement unit 222.

[0040] A solar power generation system 70 is installed in the house 11. The solar power generation system 70 is installed in a location that can receive sunlight during the day, such as on the roof. The electricity generated by the solar power generation system 70 is stored in a battery 80. The solar power generation system 70 and the battery 80 are connected to a power converter 90. The power converter 90 can convert the DC power output from the solar power generation system 70 into a voltage and output DC power of a predetermined voltage. The power output from the power converter 90 is supplied to the battery 80, and the battery 80 is charged.

[0041] The power converter 90 is connected to the electrical wiring 20. The power converter 90 can convert the DC power discharged from the battery 80 and output it to the electrical wiring 20. Furthermore, the power converter 90 can convert AC power supplied from the grid power source into DC power and charge the battery 80, for example, during times when the solar power generation device 70 is not generating power, such as at night.

[0042] A smart meter 50 is installed on the power line 23 connected to the grid power supply. The smart meter 50 is a power measuring device with communication capabilities. Specifically, the smart meter 50 includes a power measuring unit 51 and a wireless communication unit 52. The power measuring unit 51 measures the power in the power line 23. The power measuring unit 51 is an example of a "reference measuring unit".

[0043] The power measurement unit 51 includes a voltage sensor 51V and a current sensor 51A. The voltage sensor 51V measures the voltage in the power line 23. The voltage sensor 51V is an example of a "reference voltage sensor". The current sensor 51A measures the current in the power line 23. The current sensor 51A is an example of a "reference current sensor". Power is calculated based on the voltage value measured by the voltage sensor 51V and the current value measured by the current sensor 51A. For example, the power value is calculated by voltage value × current value × power factor. Power calculation is performed, for example, by a processor (not shown) provided in the power measurement unit 51.

[0044] The wireless communication unit 52 is, for example, a communication interface for a wireless LAN (Local Area Network) compliant with the wireless communication standard IEEE 802.11. The smart meter 50 can wirelessly transmit reference measurement information, including voltage and current values ​​measured by the voltage sensor 51V and current sensor 51A, via the wireless communication unit 52.

[0045] The management device 100 is connected to the wireless communication device 200. The wireless communication device 200 is, for example, a communication device compliant with IEEE 802.11. The wireless communication device 200 is, for example, a wireless LAN access point and can communicate wirelessly with the smart meter 50 and the charge / discharge device 30. For example, the wireless communication device 200 has the function of a router and can communicate with servers on the internet, etc.

[0046] The management device 100 and the wireless communication device 200 can communicate, for example, via wireless or wired communication. For example, the wireless communication device 200 includes an Ethernet® interface and can communicate with the management device 100 using a communication protocol such as TCP / IP (Transmission Control Protocol / Internet Protocol). The wireless communication device 200 relays communication between the management device 100 and the smart meter 50 and the charge / discharge device 30.

[0047] The management device 100 manages the power consumption of the load 60 connected to the electrical wiring 20 and the power charged and discharged by the charge / discharge device 30. For example, the management device 100 is a HEMS (Home Energy Management System) controller.

[0048] The management device 100 can also manage the electricity generated by the solar power generation device 70 and the electricity stored in the battery 80.

[0049] Figure 2 is a block diagram showing an example of the configuration of a power conversion device according to this embodiment.

[0050] The control device 100 is connected to the power converter 90 by a signal line and controls the power converter 90. By controlling the power converter 90, the control device 100 can perform the following energy management.

[0051] The power converter 90 includes a boost DC / DC converter 91, a bidirectional AC / DC converter 92, and a bidirectional DC / DC converter 93. The boost DC / DC converter 91 is connected to the photovoltaic power generation device 70 by a power line, boosts the DC power input from the photovoltaic power generation device 70, and outputs the boosted DC power.

[0052] The output power from the boost DC / DC converter 91 is input to the bidirectional DC / DC converter 93. The bidirectional DC / DC converter 93 converts the voltage of the input DC power. The bidirectional DC / DC converter 93 is connected to the battery 80 by a power line and outputs the DC power after voltage conversion to the battery 80, charging the battery 80.

[0053] As described above, the control device 100 controls the power converter 90 and charges the battery 80 with electricity generated by the solar power generation device 70 during the day.

[0054] The bidirectional AC / DC converter 92 is connected to the electrical wiring 20, and AC power from the grid power supply can be input from the electrical wiring 20. The bidirectional AC / DC converter 92 converts the input AC power into DC power. The converted DC power is input from the bidirectional AC / DC converter 92 to the bidirectional DC / DC converter 93. The bidirectional DC / DC converter 93 converts the voltage of the DC power input from the bidirectional AC / DC converter 92, outputs the voltage-converted DC power to the battery 80, and charges the battery 80.

[0055] The control device 100 can control the power converter 90 and store power supplied from the grid in the battery 80 during times when it is not suitable for power generation by the solar power generation device 70, such as at night or during bad weather.

[0056] Furthermore, the power converter 90 can discharge the battery 80. The bidirectional DC / DC converter 93 converts the DC power output from the battery 80 and outputs the DC power after voltage conversion to the bidirectional AC / DC converter 92. The bidirectional AC / DC converter 92 converts the input DC power to AC power and outputs the AC power to the electrical wiring 20.

[0057] The control device 100 can reverse-flow a portion of the power stored in the battery 80 from the electrical wiring 20 to the grid power supply when the battery 80 has sufficient remaining power.

[0058] The battery 80 is used in the house 11. For example, instead of power from the grid, the power stored in the battery 80 can be supplied to the load 60 through the electrical wiring 20, or it can be supplied to the charge / discharge device 30 to charge the electric vehicle 40.

[0059] The management device 100 is located within the residence 11. The management device 100 is operated by a user, for example, a resident of the residence 11. The management device 100 includes an input device and a display device. The administrator can input information into the management device 100 using the input device and monitor the power operation status of the entire residence 11 using the display device.

[0060] [2.Charge / discharge device] Figure 3 is a block diagram showing an example of the hardware configuration of a charge / discharge device according to the embodiment. The charge / discharge device 30 includes a power conversion circuit 301, a control circuit 302, a communication interface (communication I / F) 303, and a wireless communication I / F 304.

[0061] The power conversion circuit 301 is connected to plug 31 via a power line. Plug 31 can be connected to connector 21. The power conversion circuit 301 is connected to plug 32 via a power line. Plug 32 can be connected to electric vehicle 40.

[0062] The electric vehicle 40 includes an on-board battery 401, an on-board control device 402, and an inlet 403.

[0063] The onboard battery 401 is a drive motor that supplies power to a motor (not shown) for propelling the electric vehicle 40.

[0064] The on-board control device 402, together with the charge / discharge device 30, can control the charging and discharging of the on-board battery 401. Specifically, the on-board control device 402 communicates with the control circuit 302 of the charge / discharge device 30 to perform charging and discharging of the on-board battery 401.

[0065] The inlet 403 includes a socket (not shown) that can be connected to the plug 32. The inlet 403 is connected to the vehicle battery 401 by power lines. The inlet 403 is connected to the vehicle control unit 402 by communication lines.

[0066] Figure 4 is a circuit diagram showing an example of the configuration of a power conversion circuit in a charge / discharge device. The power conversion circuit 301 includes a bidirectional AC / DC converter 311, a bidirectional AC / DC converter 312, a bidirectional AC / DC converter 313, a transformer 314, and a power measurement unit 33.

[0067] The bidirectional AC / DC converter 311 is connected to the power lines extending from the plug 31. The bidirectional AC / DC converter 311 is connected to the bidirectional AC / DC converter 312. The bidirectional AC / DC converter 312 and the bidirectional AC / DC converter 313 are connected via a transformer 314. The bidirectional AC / DC converter 313 is connected to the power lines extending from the plug 32.

[0068] Each of the bidirectional AC / DC converters 311, 312, and 313 is a full-bridge circuit containing, for example, multiple (four) switching elements. The switching elements are power semiconductor devices such as IGBTs (Insulated Gate Bipolar Transistors) and power MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors).

[0069] When charging the vehicle battery 401, the power conversion circuit 301 converts the AC power input from plug 31 into DC power and outputs the DC power to plug 32. Specifically, the bidirectional AC / DC converter 311 functions as a rectifier and smoothing circuit, converting the input AC power into DC power. The bidirectional AC / DC converter 312 functions as a DC / AC converter, converting DC power to AC power through switching operation. The transformer 314 converts the voltage of the AC power. The bidirectional AC / DC converter 313 functions as a rectifier and smoothing circuit, converting the AC power after voltage conversion back into DC power.

[0070] When discharging the vehicle battery 401, the power conversion circuit 301 converts the DC power input from plug 32 into AC power and outputs the AC power to plug 31. Specifically, the bidirectional AC / DC converter 313 functions as a DC / AC converter, converting DC power to AC power through switching operation. The transformer 314 converts the voltage of the AC power. The bidirectional AC / DC converter 312 functions as a rectifier and smoothing circuit, converting the AC power after voltage conversion back into DC power. The bidirectional AC / DC converter 313 functions as a DC / AC converter, converting DC power to AC power through switching operation.

[0071] The power measurement unit 33 is attached to the power line extending from the bidirectional AC / DC converter 311 to the plug 31. The power measurement unit 33 measures the power supplied to the charge / discharge device 30 through the plug 31 or the power output from the charge / discharge device 30. In other words, the power measurement unit 33 measures the charge / discharge power of the charge / discharge device 30. The power measurement unit 33 is an example of a "target measurement unit".

[0072] More specifically, the power measurement unit 33 includes a voltage sensor 33V and a current sensor 33A. The voltage sensor 33V measures the charge / discharge voltage of the charge / discharge device 30. The voltage sensor 33V is an example of a "target voltage sensor". The current sensor 33A measures the charge / discharge current of the charge / discharge device 30. The current sensor 33A is an example of a "target current sensor". The charge / discharge power is calculated based on the voltage value measured by the voltage sensor 33V and the current value measured by the current sensor 33A. For example, the power value is calculated by voltage value × current value × power factor. The calculation of the charge / discharge power is performed, for example, by a processor or control circuit 302 (not shown) provided in the power measurement unit 33.

[0073] Returning to Figure 3, the control circuit 302 is connected to the power conversion circuit 301. The control circuit 302 consists of, for example, a processor, memory, etc. By controlling the switching operation of the power conversion circuit 301, the control circuit 302 can selectively cause the power conversion circuit 301 to perform charging and discharging functions.

[0074] The communication interface 303 is connected to a communication line extending from the plug 32. When the plug 32 is connected to the inlet 403, the communication interface 303 is connected to the on-board control unit 402 via a communication line. The communication interface 303 is used for communication with the on-board control unit 402. The communication interface 303 can communicate using a specific communication protocol, such as CAN (Controller Area Network).

[0075] The wireless communication interface (I / F304) is used for communication with the charge / discharge management device (100). The wireless communication interface (I / F304) is, for example, a communication interface compliant with IEEE 802.11. The wireless communication interface (I / F304) can communicate using a specific communication protocol, such as TCP / IP.

[0076] [3. Hardware configuration of the management device] Figure 5 is a block diagram showing an example of the hardware configuration of a management device according to an embodiment. The management device 100 includes a processor 101, a non-volatile memory 102, a volatile memory 103, an input device 104, a display device 105, and a communication I / F 106.

[0077] The volatile memory 103 is a semiconductor memory such as SRAM (Static Random Access Memory) or DRAM (Dynamic Random Access Memory). The non-volatile memory 102 is a flash memory, hard disk, ROM (Read Only Memory), etc. The non-volatile memory 102 stores the management program 110, which is a computer program, and the data used to execute the management program 110. Each function of the management device 100 is performed when the management program 110 is executed by the processor 101. The management program 110 can be stored in a recording medium such as flash memory, ROM, or CD-ROM. The processor 101 manages the power measurement accuracy of the power measurement unit 33 of the charge / discharge device 30 based on the management program 110.

[0078] The processor 101 is, for example, a CPU (Central Processing Unit). However, the processor 101 is not limited to a CPU. The processor 101 may also be a GPU (Graphics Processing Unit). The processor 101 may be, for example, a multi-core processor. The processor 101 may also be a single-core processor. The processor 101 may be, for example, an ASIC (Application Specific Integrated Circuit), or a programmable logic device such as a gate array or FPGA (Field Programmable Gate Array). In this case, the ASIC or programmable logic device is configured to execute the same processing as the management program 110.

[0079] The non-volatile memory 102 is equipped with a statistical database (hereinafter referred to as "statistical DB") 111. The statistical DB 111 stores statistical values ​​of electricity consumption in the house 11. More specifically, the statistical DB 111 stores statistical values ​​of electricity consumption for multiple periods of the year, for example, spring (April to June), summer (July to September), autumn (October to December), and winter (January to March). The user's lifestyle pattern in the house 11 changes depending on the period of the year. For example, in spring and autumn, the user does not use the air conditioner, while in summer, the user uses the air conditioner. For example, in winter, the user uses the air conditioner and heating appliances such as electric heaters. Since the electricity consumption in the house 11 changes according to the user's lifestyle pattern, it shows a fixed trend for each period. The statistical DB 111 stores statistical values ​​of electricity consumption that differ for each of these periods.

[0080] The statistical value of electricity consumption is not the total amount of electricity consumed over a single period, but rather the instantaneous value of electricity consumption. The statistical value is, for example, the mean. Another example is that the statistical value may be the median. Yet another example is that the statistical value may be the mode. In other words, the statistical value may be a measure of central tendency.

[0081] For example, the voltage value in the power line 23 connected to the grid power supply is the same as the voltage value in the electrical wiring 20. That is, the voltage applied to the power line extending from the plug 31 of the charge / discharge device 30 is the same as the voltage in the power line 23. In this case, the statistical values ​​of power consumption for each period stored in the statistical DB 111 may be the statistical values ​​of current consumption for each period in the house 11.

[0082] For example, the input device 104 includes a keyboard and a pointing device such as a mouse. The input device 104 may also be a capacitive or pressure-sensitive touchpad superimposed on the screen of the display device 105. The input device 104 is used to input data to the management device 100.

[0083] The display device 105 includes, for example, a liquid crystal panel or an OEL (organic electroluminescent) panel. The display device 105 can display text or graphic information.

[0084] The communication interface 106 is used for communication with the charge / discharge device 30. The communication interface 106 is, for example, a wired communication interface and is connected to the wireless communication device 200 by signal lines. The communication interface 106 may also be a wireless communication interface. The communication interface 106 can communicate using a specific communication protocol, such as TCP / IP.

[0085] [4. Functions of the Measurement Accuracy Management System] When the onboard battery 401 of the electric vehicle 40 is used as one of the distributed power sources, the user, who is a resident of the house 11, trades the electricity discharged from the onboard battery 401 with the aggregator. In this trade, the measured value of the discharged power by the power measurement unit 33 of the charge / discharge device 30 is used. If the measurement accuracy of the power measurement unit 33 does not meet a certain standard, proper electricity trading cannot be performed. For this reason, the measurement accuracy management system 10 manages the accuracy of power measurement in the charge / discharge device 30.

[0086] Figure 6 is a functional block diagram showing an example of the functions of the measurement accuracy management system according to the embodiment.

[0087] The smart meter 50 has the function of a transmitting unit 510.

[0088] When the processor 101 executes the management program 110, the management device 100 functions as a measurement instruction unit 111, a first acquisition unit 112, a second acquisition unit 113, a calculation unit 114, a determination unit 115, a calibration execution instruction unit 116, a notification processing unit 117, and an output unit 118.

[0089] The charge / discharge device 30 has the following functions: a charge / discharge control unit 321, a measurement value acquisition unit 322, a transmission unit 323, a reception unit 324, a calibration execution unit 325, and a notification request unit 326.

[0090] The measurement instruction unit 111 instructs the charge / discharge device 30 to measure power.

[0091] When the charge / discharge control unit 321 receives a power measurement instruction from the measurement instruction unit 111, it performs discharge, charge, or charge / discharge of the on-board battery 401. Specifically, triggered by the power measurement instruction, it controls the power conversion circuit 301 to start charging, discharging, or charge / discharge of the on-board battery 401. Charging, discharging, or charge / discharge of the on-board battery 401 is performed in a specific pattern (hereinafter referred to as the "determination pattern"). The determination pattern is, for example, a voltage pattern. The determination pattern may be a current pattern, or both a voltage pattern and a current pattern.

[0092] For example, the judgment pattern is different from the pattern used during normal charging or normal discharging of the vehicle battery 401. In other words, the judgment pattern may be a pattern used for power measurement. This allows the vehicle battery 401 to be charged, discharged, or recharged using a judgment pattern suitable for current measurement, and the accuracy of power measurement can be accurately determined.

[0093] The power measurement unit 33 measures voltage and current when the onboard battery 401 is charging, discharging, or charging / discharging according to a determination pattern. The power measurement unit 33 may measure voltage and current only when the onboard battery 401 is charging, or it may measure voltage and current only when the onboard battery 401 is discharging. However, in order to accurately determine the measurement accuracy of the power measurement unit 33, it is preferable to measure voltage and current during both charging and discharging.

[0094] The measurement value acquisition unit 322 acquires the measured values ​​(target measured values) from the power measurement unit 33. Specifically, the measurement value acquisition unit 322 acquires the voltage measured value (target voltage value) and the current measured value (target current value) from the power measurement unit 33.

[0095] The transmitting unit 323 transmits target measurement information, including the target measurement value acquired by the measurement value acquisition unit 322, to the management device 100. The target measurement information includes the measurement time of the target voltage value and the target current value (hereinafter also referred to as "target voltage measurement time"), and the measurement time of the target current value and the target current value (hereinafter also referred to as "target current measurement time"). The target voltage measurement time and the target current measurement time may be the same time. The target measurement information may include only one of the target voltage measurement time and the target current measurement time.

[0096] The smart meter 50 repeatedly measures voltage and current at predetermined time intervals. The transmitting unit 510 acquires the measured values ​​(reference measured values) while the onboard battery 401 is charging, discharging, or charging and discharging according to the judgment pattern described above, and transmits the reference measurement information, including the reference measured values, to the management device 100. Specifically, the reference measurement information includes the voltage measured value (reference voltage value), the measurement time of the reference voltage value (hereinafter also referred to as "reference voltage measurement time"), the current measured value (reference current value), and the measurement time of the reference current value (hereinafter also referred to as "reference current measurement time") while the onboard battery 401 is charging, discharging, or charging and discharging according to the judgment pattern. The reference voltage measurement time and the reference current measurement time may be the same time. The reference measurement information may include only one of the reference voltage measurement time and the reference current measurement time.

[0097] The first acquisition unit 112 acquires reference measurement values ​​from the smart meter 50. For example, the first acquisition unit 112 receives reference measurement information transmitted from the smart meter 50.

[0098] The second acquisition unit 113 acquires target measurement values ​​from the charge / discharge device 30. For example, the second acquisition unit 113 receives target measurement information transmitted from the charge / discharge device 30.

[0099] The determination unit 115 determines whether or not calibration of the power measurement unit 33 of the charge / discharge device 30 is necessary, based on the reference measurement value acquired by the first acquisition unit 112 and the target measurement value acquired by the second acquisition unit 113.

[0100] The calculation unit 114 can calculate the charge / discharge power values ​​to be charged or discharged by the charge / discharge device 30 based on the power consumption value and reference power value of the load 60 connected to the electrical wiring 20. For example, the power consumption value of the load 60 is selected from multiple statistical values ​​of the power consumption value of the load 60 calculated for each period of the year. In one example, the calculation unit 114 selects one statistical value (corresponding to the current period) from the statistical values ​​for each period stored in the statistical DB 111.

[0101] For example, the determination unit 115 compares the reference measured value with the target measured value. The smart meter 50 has high power measurement accuracy and high reliability of the measured value because it undergoes rigorous verification. For this reason, the determination unit 115 considers the reference measured value as the true value and determines how much the target measured value deviates from the reference measured value, that is, how much error is contained in the target measured value. If the error is within a predetermined tolerance range, the determination unit 115 determines that the measurement accuracy of the power measurement unit 33 of the charge / discharge device 30 meets a certain standard. In this case, the determination unit 115 can determine that calibration of the power measurement unit 33 is unnecessary. If the error is outside the tolerance range, the determination unit 115 determines that the measurement accuracy of the power measurement unit 33 of the charge / discharge device 30 does not meet the standard. In this case, the determination unit 115 can determine that calibration of the power measurement unit 33 is necessary.

[0102] In one example, the determination unit 115 compares the charge / discharge power value calculated by the calculation unit 114 with the target measured value and, based on the comparison result, can determine whether or not calibration of the power measurement unit 33 is necessary. This allows the measurement accuracy of the power measurement unit 33 to be confirmed, taking into account the differences in power consumption at different times of the year. If the charge / discharge power value is not calculated using statistical values, the function of the calculation unit 114 can be omitted.

[0103] The determination unit 115 may perform a first determination process and a second determination process. The first determination process is a process that determines whether or not calibration of the power measurement unit 33 is necessary based on a reference voltage value and a target voltage value. The second determination process is a process that determines whether or not calibration of the power measurement unit 33 is necessary based on a reference current value and a target current value.

[0104] Specifically, in the first determination process, the determination unit 115 calculates the difference D1 between the reference voltage value and the target voltage value. The difference D1 is the absolute value of the difference between the reference voltage value and the target voltage value, and is the measurement error of the voltage sensor 33V. Furthermore, the determination unit 115 compares the difference D1 with a preset threshold Th1. The threshold Th1 defines the acceptable range of measurement error for the voltage sensor 33V. If the difference D1 is less than or equal to the threshold Th1, the determination unit 115 determines that calibration of the power measurement unit 33 is unnecessary. If the difference D1 is greater than the threshold Th1, the determination unit 115 determines that calibration of the power measurement unit 33 is necessary.

[0105] The calculation unit 114 subtracts the statistical value of the current used, obtained from the statistical DB 111, from the reference current value. This calculates the charge / discharge current value of the charge / discharge device 30. The charge / discharge current value corresponds to the value of the current flowing through the power line between the power conversion circuit 301 and the plug 31. In other words, the charge / discharge current value can be the true value of the current measured by the current sensor 33A. In the second determination process, the determination unit 115 calculates the difference D2 between the charge / discharge current value and the target current value. The difference D2 is the absolute value of the difference between the charge / discharge current value and the target current value, and is the measurement error of the current sensor 33A. Furthermore, the determination unit 115 compares the difference D2 with a preset threshold Th2. The threshold Th2 defines the allowable range of measurement error of the current sensor 33A. If the difference D2 is less than or equal to the threshold Th2, the determination unit 115 determines that calibration of the power measurement unit 33 is unnecessary. If the difference D2 is greater than the threshold Th2, the determination unit 115 determines that calibration of the power measurement unit 33 is required.

[0106] For example, the first acquisition unit 112 acquires a reference measurement value measured by the smart meter 50 during a specific time period of the day. Similarly, the second acquisition unit 113 acquires a target measurement value measured by the power measurement unit 33 during a specific time period of the day. More specifically, the first acquisition unit 112 acquires a reference measurement value measured by the smart meter 50 at night, and the second acquisition unit 113 acquires a target measurement value measured by the power measurement unit 33 at night. As a result, the need for calibration of the power measurement unit 33 is determined by the power value measured at night when the power consumption of the load 60 is small and no power is being generated by the solar power generation device 70, thus reducing the determination error caused by the power consumption of the load 60 and the amount of power generated by the solar power generation device 70. In this case, the statistical value of power consumption (current consumption) stored in the statistical DB 111 is the statistical value of power consumption (current consumption) at night.

[0107] The calibration execution instruction unit 116 transmits instruction information to perform calibration when the determination unit 115 determines that calibration of the power measurement unit 33 is necessary. The receiving unit 324 receives the instruction information transmitted from the calibration execution instruction unit 116. The calibration execution unit 325 performs calibration of the power measurement unit 33 based on the instruction information received by the receiving unit 324.

[0108] The instruction information includes reference power information used for calibrating the power measurement unit 33. The reference power information is the measured value of the power measurement unit 51 corresponding to a known measured value by the power measurement unit 33. More specifically, the reference power information is the measured power value of the power measurement unit 51 at the same or approximately the same time as the measurement time of the known measured value in the power measurement unit 33.

[0109] While the vehicle battery 401 is charging, discharging, or charge-discharge in the determination pattern, power is measured by both the power measurement unit 51 and the power measurement unit 33. Therefore, the reference power information may be the measured value (reference measured value) obtained by the power measurement unit 51 while the vehicle battery 401 is charging, discharging, or charge-discharge in the determination pattern.

[0110] For example, the instruction information includes a calibration voltage value based on the voltage value measured by the voltage sensor 51V and a calibration current value based on the current value measured by the current sensor 51A.

[0111] In a specific example, the reference power information includes the voltage measurement value (reference voltage value) obtained by the voltage sensor 51V and the current measurement value (reference current value) obtained by the current sensor 51A, respectively, as calibration voltage value and calibration current value, while the onboard battery 401 is charging, discharging, or charging / discharging according to the determination pattern. Since the reference voltage measurement time and the target voltage measurement time correspond to each other (are the same or approximate), the reference voltage value corresponds to the target voltage value. Since the reference current measurement time and the target current measurement time correspond to each other (are the same or approximate), the reference current value corresponds to the target current value.

[0112] The calibration execution unit 325 performs calibration of the voltage sensor 33V based on the calibration voltage value. The calibration execution unit 325 also performs calibration of the current sensor 33A based on the calibration current value.

[0113] Specifically, the calibration execution unit 325 adjusts the voltage sensor 33V so that the measured value of the voltage sensor 33V matches the reference voltage value (calibration voltage value) when the same voltage as when the target voltage value was measured is applied to the power line extending from the bidirectional AC / DC converter 311 to the plug 31. The calibration execution unit 325 also adjusts the current sensor 33A so that the measured value of the current sensor 33A matches the reference current value (calibration current value) when the same current as when the target current value was measured is applied to the power line extending from the bidirectional AC / DC converter 311 to the plug 31. This performs calibration of the voltage sensor 33V and the current sensor 33A.

[0114] The notification request unit 326 requests the management device 100 to output notification information when the calibration execution unit 325 has performed calibration of the power measurement unit 33. The notification information is information to notify the user that calibration has been performed.

[0115] The notification processing unit 117 receives a request from the notification request unit 326. Upon receiving the request, the notification processing unit 117 executes notification processing to output notification information. The output unit 118 outputs the notification information according to the notification processing performed by the notification processing unit 117.

[0116] The output unit 118 is, for example, a display device 105. The notification information is, for example, a notification screen that notifies the user that calibration has been performed. Figure 7 shows an example of a notification screen. The notification screen 150 in the example of Figure 7 includes the text information "Power measurement calibration has been performed." This allows the user to be notified that calibration has been performed.

[0117] [5. Operation of the Measurement Accuracy Management System] Figure 8 is a sequence diagram showing an example of the overall operation of the measurement accuracy management system according to the embodiment.

[0118] The control device 100 transmits a power measurement instruction to the charge / discharge device 30 (step S11). Upon receiving the measurement instruction from the control device 100, the charge / discharge device 30 performs charging, discharging, or charge / discharge of the onboard battery 401 according to the determination pattern.

[0119] The power measurement unit 33 repeatedly measures voltage and current at a fixed interval. Therefore, even while the onboard battery 401 is charging, discharging, or charging / discharging according to the determination pattern, the power measurement unit 33 measures voltage and current. Similarly, the power measurement unit 51 also repeatedly measures voltage and current at a fixed interval. Therefore, even while the onboard battery 401 is charging, discharging, or charging / discharging according to the determination pattern, the power measurement unit 51 measures voltage and current.

[0120] The power measurement unit 51 generates reference measurement information, including a reference voltage value and reference voltage measurement time, as well as a reference current value and reference current measurement time, while the onboard battery 401 is charging, discharging, or charging / discharging according to the determination pattern, and transmits the generated reference measurement information to the management device 100 (step S13).

[0121] The power measurement unit 33 generates target measurement information including the target voltage value and target voltage measurement time, as well as the target current value and target current measurement time, while the onboard battery 401 is charging, discharging, or charging / discharging according to the determination pattern, and transmits the generated target measurement information to the management device 100 (step S14).

[0122] The control device 100 performs a determination process (step S15) to determine whether or not calibration of the power measurement unit 33 is necessary based on the received reference measurement information and target measurement information. The determination process includes the first determination process and the second determination process described above.

[0123] If the judgment process determines that calibration is necessary, the management device 100 transmits instruction information to the charge / discharge device 30 and instructs it to perform calibration (step S16). Upon receiving the instruction information, the charge / discharge device 30 performs calibration of the power measurement unit 33 (step S17).

[0124] Once calibration is complete, the charge / discharge device 30 requests the management device 100 to notify the user that calibration has been performed (step S18). Upon receiving the request, the management device 100 displays the notification screen 150 on the display device 105 (step S19).

[0125] Figure 9 is a flowchart showing an example of the processing of the management device according to the embodiment. The management device 100 performs the following processing by having the processor 101 execute the management program 110. The following processing is performed at a specific time, for example, at night.

[0126] The user inserts the plug 31 of the charge / discharge device 30 into the connector 21 and the plug 32 into the inlet 403 of the electric vehicle 40. This connects the charge / discharge device 30 to the electrical wiring 20 and the charge / discharge device 30 to the electric vehicle 40. The processor 101 recognizes the connection when the charge / discharge device 30 is connected to the electrical wiring 20 (step S101).

[0127] The processor 101 sends a power measurement instruction to the charge / discharge device 30 (step S102). As a result, the charge / discharge device 30 performs charging, discharging, or charge / discharge of the onboard battery 401 according to the determination pattern. While the onboard battery 401 is charging, discharging, or charge / discharge according to the determination pattern, the voltage and current are measured by the power measurement unit 51 and the power measurement unit 33.

[0128] The smart meter 50 transmits reference measurement information to the management device 100. The management device 100 receives the reference measurement information (step S103).

[0129] The charge / discharge device 30 transmits the target measurement information to the management device 100. The management device 100 receives the target measurement information (step S104).

[0130] The processor 101 obtains statistical values ​​of power consumption for the time period corresponding to the present from the statistical DB 111 (step S105). Here, we will explain the case where statistical values ​​of current consumption are used as the statistical values ​​of power consumption. The processor 101 subtracts the statistical values ​​of current consumption from the reference current value included in the reference measurement information to calculate the charge / discharge current value (step S106).

[0131] The processor 101 calculates the difference D1 between the reference voltage value and the target voltage value (step S107), and calculates the difference D2 between the charge / discharge current value and the target current value (step S108).

[0132] The processor 101 compares the difference D1 with the threshold Th1 and determines whether the difference D1 is greater than or equal to the threshold Th1 (step S109).

[0133] If the difference D1 is less than or equal to the threshold Th1 (NO in step S109), the processor 101 compares the difference D2 with the threshold Th2 and determines whether the difference D2 is greater than the threshold Th2 (step S110).

[0134] If the difference D2 is less than or equal to the threshold Th2 (NO in step S110), the processing of the management device 100 is terminated.

[0135] If the difference D1 is greater than the threshold Th1 (YES in step S109), or if the difference D2 is greater than the threshold Th2 (YES in step S110), the processor 101 determines that calibration of the power measurement unit 33 is required. The processor 101 generates instruction information and transmits the generated instruction information to the charge / discharge device 30 (step S111).

[0136] Upon receiving the instruction information, the charge / discharge device 30 performs calibration of the power measurement unit 33 using the reference power information contained in the instruction information. Once the calibration is complete, the charge / discharge device 30 sends a calibration execution notification request to the management device 100.

[0137] The management device 100 receives a notification request from the charge / discharge device 30 (step S112). The processor 101 displays the notification screen 150 on the display device 105 in accordance with the notification request (step S113). This completes the processing of the management device 100.

[0138] [6. Variant] In the embodiment described above, the voltage value measured by the smart meter 50 is used as the reference voltage value, and the necessity of calibration of the power measurement unit 33 of the charge / discharge device 30 is determined based on the reference voltage value and the target voltage value measured by the charge / discharge device 30 (first determination process). The current value measured by the smart meter 50 is used as the reference current value, and the necessity of calibration of the power measurement unit 33 of the charge / discharge device 30 is determined based on the reference current value and the target current value measured by the charge / discharge device 30 (second determination process). However, the embodiment is not limited to this. The power value output from the smart meter 50 may be used as the reference power value, and the necessity of calibration of the power measurement unit 33 of the charge / discharge device 30 may be determined based on the reference power value and the target power value calculated from the voltage value, current value, and power factor measured by the charge / discharge device 30.

[0139] In the modified example described above, the management device 100 can also obtain statistical values ​​of power consumption for the time period corresponding to the present from the statistical DB 111, and calculate the charge / discharge power value of the charge / discharge device 30 by subtracting the statistical values ​​of power consumption from the reference power value. The management device 100 may also calculate the difference between the calculated charge / discharge power value and the target power value measured in the charge / discharge device 30, and determine whether calibration of the power measurement unit 33 is necessary by comparing the difference with a preset threshold.

[0140] In the embodiment described above, the smart meter 50 was used as the reference measurement unit to determine whether calibration of the power measurement unit 33, which is the target measurement unit, was necessary. However, the embodiment is not limited to this. As a modified example, a power measurement unit 221 provided in the distribution board 22 can also be used as the reference measurement unit. Since the power measurement unit 221 measures the charge / discharge voltage and charge / discharge current of the charge / discharge device 30, correction based on statistical values ​​of power consumption is unnecessary. Therefore, the necessity of calibration of the power measurement unit 33 can be determined with a simpler process.

[0141] In the embodiment described above, the management device 100 determines whether or not calibration of the power measurement unit 33 is necessary, and if it determines that calibration is necessary, it instructs the charge / discharge device 30 to perform calibration of the power station side unit 33. However, the embodiment is not limited to this. The charge / discharge device 30 may determine whether or not calibration of the power measurement unit 33 is necessary, and if it determines that calibration is necessary, it may instruct the charge / discharge device 30 to perform calibration of the power station side unit 33. In other words, the charge / discharge device 30 may have the functions of the determination unit 115 and the calibration execution instruction unit 116 (and calculation unit 114) shown in Figure 6.

[0142] In the embodiment described above, the charge / discharge device 30 was used to charge and discharge the on-board battery of the electric vehicle 40, but it is not limited to this. For example, it may be a battery charge / discharge device permanently installed in a house 11.

[0143] [7. Supplementary Notes] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than by the embodiments described above, and includes the meaning of equivalents to the claims and all modifications within that scope. [Explanation of Symbols]

[0144] 10 Measurement Accuracy Management System 11 Housing 20 Electrical Wiring 21 Connectors 22 Distribution boards 221 Power Measurement Unit 221V Voltage Sensor 221A Current Sensor 222 Power Measurement Unit 222V Voltage Sensor 222A Current Sensor 23 Power lines 30 Charge / discharge device 31 plugs 32 plugs 33 Power Measurement Unit (Target Measurement Unit) 33V Voltage Sensor 33A Current Sensor 301 Power Conversion Circuit 302 Control Circuit 303 Communication Interface (Communication I / F) 304 Wireless Communication Interface (Wireless Communication I / F) 311, 312, 313 Bidirectional AC / DC Converters 314 Transformer 321 Charge / Discharge Control Unit 322 Measurement Value Acquisition Unit 323 Transmitter 324 Receiving Unit 325 Calibration Execution Unit 326 Notification request section 40 Electric vehicles 401 Car Battery 402 In-vehicle control system 403 Inlet 50 Smart meter (reference measurement unit) 51 Power Measurement Unit 51V Voltage Sensor 51A Current Sensor 52 Wireless Communication Section 510 Transmitter 60 load 70 Solar power generation equipment 80 batteries 90 Power converter 91 Boost DC / DC Converter 92 Bidirectional AC / DC Converter 93 Bidirectional DC / DC Converter 100 Management device 101 Processors 102 Non-volatile memory 103 Volatile memory 104 Input device 105 Display device 106 Communication Interface (Communication I / F) 110 Management Programs 111 Statistical Databases (Statistical DB) 111 Measurement Indicator 112 First acquisition part 113 Second Acquisition Department 114 Calculation Unit 115 Judgment section 116 Calibration execution instruction unit 117 Notification Processing Unit 118 Output section 150 Notification screen 200 Wireless communication devices

Claims

1. A charge / discharge device that charges and discharges batteries through electrical wiring connected to the grid power supply, A management device that manages the power consumption of loads connected to the aforementioned electrical wiring and the power charged and discharged by the aforementioned charge / discharge device, A reference measurement unit for measuring power in the aforementioned electrical wiring, A measurement accuracy management system comprising, The charging and discharging device includes a target measurement unit for measuring the charging and discharging power of the battery, The aforementioned control device is A first acquisition unit acquires a reference measurement value, which is a power measurement value by the aforementioned reference measurement unit. A second acquisition unit acquires a target measurement value which is the measured value of the battery's charge / discharge power by the target measurement unit, Includes, The aforementioned measurement accuracy management system is A determination unit that determines whether or not calibration of the target measurement unit is necessary based on the reference measurement value acquired by the first acquisition unit and the target measurement value acquired by the second acquisition unit, If the determination unit determines that calibration of the target measurement unit is necessary, the instruction unit transmits instruction information to instruct the execution of the calibration. Equipped with, The charging and discharging device includes a calibration execution unit that performs calibration of the target measurement unit based on the instruction information transmitted from the instruction unit. Measurement accuracy management system.

2. The reference measurement unit includes a reference voltage sensor for measuring the voltage in the electrical wiring and a reference current sensor for measuring the current in the electrical wiring. The aforementioned target measurement unit includes a target voltage sensor for measuring the charge / discharge voltage of the battery and a target current sensor for measuring the charge / discharge current of the battery. The determination unit, A first determination process determines whether or not calibration of the target measurement unit is necessary, based on a reference voltage value which is a voltage value measured by the reference voltage sensor and a target voltage value which is a voltage value measured by the target voltage sensor. A second determination process determines whether or not calibration of the target measurement unit is necessary, based on a reference current value which is the current value measured by the reference current sensor and a target current value which is the current value measured by the target current sensor. Execute The measurement accuracy management system according to claim 1.

3. The instruction information includes a calibration voltage value based on the voltage value measured by the reference voltage sensor and a calibration current value based on the current value measured by the reference current sensor. The calibration execution unit performs calibration of the target voltage sensor based on the calibration voltage value and performs calibration of the target current sensor based on the calibration current value. The measurement accuracy management system according to claim 2.

4. The aforementioned reference measurement value is the measurement value of the power supplied from the grid power source or the power flowing back into the grid power source. The measurement accuracy management system according to claim 1.

5. The aforementioned reference measurement unit is a smart meter. The measurement accuracy management system according to claim 4.

6. The measurement accuracy management system further includes a calculation unit that calculates the charge / discharge power value charged or discharged by the charge / discharge device based on the power consumption value of the load connected to the electrical wiring and the reference measurement value. The determination unit determines whether or not calibration of the target measurement unit is necessary based on a comparison between the charge / discharge power value calculated by the calculation unit and the target measurement value. The measurement accuracy management system according to claim 4.

7. The power consumption value of the aforementioned load is selected from a plurality of statistical values ​​of the power consumption value of the aforementioned load calculated for each period of the year. The measurement accuracy management system according to claim 6.

8. The power consumption value of the aforementioned load is the power consumption value of the aforementioned load during a specific time period of the day. The first acquisition unit acquires the reference measurement value measured by the reference measurement unit during the specific time period, The second acquisition unit acquires the target measurement value measured by the target measurement unit during the specific time period. The measurement accuracy management system according to claim 6.

9. The aforementioned specific time period is nighttime. The measurement accuracy management system according to claim 8.

10. The aforementioned electrical wiring is connected to a power converter that converts the power generated by the generator. The determination unit further calculates the charge / discharge power value based on the output power value from the power converter. The measurement accuracy management system according to claim 6.

11. The charging and discharging device includes a charging and discharging control unit that charges or discharges the battery in a specific pattern. The second acquisition unit acquires the target measurement value, which is the measured value of the charge / discharge power of the battery measured by the target measurement unit when the battery is charged or discharged in a specific pattern. The measurement accuracy management system according to claim 1.

12. The management device includes an output unit that outputs notification information to notify the user that the calibration has been performed when the charge / discharge device performs the calibration of the target measurement unit. The measurement accuracy management system according to claim 1.

13. The management device includes the determination unit and the instruction unit. A measurement accuracy management system according to any one of claims 1 to 12.

14. The charging and discharging device includes the determination unit and the instruction unit. A measurement accuracy management system according to any one of claims 1 to 12.

15. The aforementioned battery is an on-board battery installed in an electric vehicle. The measurement accuracy management system according to claim 1.

16. A management device that manages the power consumption of loads connected to electrical wiring connected to a grid power supply, and the power used for charging and discharging batteries by a charging and discharging device that charges and discharges batteries through the electrical wiring, A first acquisition unit acquires a reference measurement value, which is a power measurement value obtained by a reference measurement unit that measures power in the aforementioned electrical wiring. A second acquisition unit acquires a target measurement value, which is the measured value of the battery's charge / discharge power measured by a target measurement unit that measures the charge / discharge power in the charge / discharge device. A determination unit that determines whether or not calibration of the target measurement unit is necessary based on the reference measurement value acquired by the first acquisition unit and the target measurement value acquired by the second acquisition unit, If the determination unit determines that calibration of the target measurement unit is necessary, the instruction unit transmits instruction information to instruct the execution of the calibration. Equipped with, Management device.

17. A management method used by a management device that manages the power consumption of loads connected to electrical wiring connected to a grid power supply, and the charge / discharge power of a charge / discharge device that charges and discharges a battery through the electrical wiring, The steps include: acquiring a reference measurement value, which is a power measurement value obtained by a reference measurement unit that measures power in the aforementioned electrical wiring; The steps include: acquiring a target measurement value which is the measured value of the charge / discharge power of the battery by a target measurement unit that measures the charge / discharge power in the charge / discharge device; A step of determining whether or not calibration of the target measurement unit is necessary based on the acquired reference measurement value and the acquired target measurement value, If it is determined that calibration of the target measurement unit is necessary, the process includes the step of transmitting instruction information to instruct the execution of the calibration, including, Management method.

18. A management program used by a management device that manages the power consumption of loads connected to electrical wiring connected to a grid power supply, and the charging and discharging power of a charging and discharging device that charges and discharges a battery through said electrical wiring, On the computer, The steps include: acquiring a reference measurement value, which is a power measurement value obtained by a reference measurement unit that measures power in the aforementioned electrical wiring; The steps include: acquiring a target measurement value which is the measured value of the charge / discharge power of the battery by a target measurement unit that measures the charge / discharge power in the charge / discharge device; A step of determining whether or not calibration of the target measurement unit is necessary based on the acquired reference measurement value and the acquired target measurement value, If it is determined that calibration of the target measurement unit is necessary, the process includes the step of transmitting instruction information to instruct the execution of the calibration, To execute Management program.

19. A battery charge / discharge device that charges and discharges a battery through electrical wiring connected to a power grid, A target measurement unit for measuring the charging and discharging power of the aforementioned battery, A calibration execution unit performs calibration of the target measurement unit based on a determination result of whether or not calibration of the target measurement unit is necessary, based on a reference measurement value which is the power measured by a reference measurement unit that measures power in the electrical wiring, and a target measurement value which is the charge / discharge power of the battery measured by the target measurement unit. Equipped with, Charge / discharge device.

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