JP2012210004A - Energy management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system (EMS) capable of making efficient a pre-air conditioner and preventing destabilization of a system power supply by controlling an in-vehicle air conditioner.SOLUTION: An in-vehicle air conditioner 33 of an electric vehicle 30 can be controlled from an EMS 11 of a dwelling house 10. The EMS 11 acquires the current situation of power demand, and based on utilization schedule of a domestic load 14 and a learned result of utilization history, the future situation of power demand is predicted. Based on these information, the EMS 11 performs the pre-air conditioning operation using the in-vehicle air conditioner 33 during a period of time for an inexpensive power cost and allows the in-vehicle air conditioner 33 to consume excess power due to temporary oversupply.

Description

  The present invention relates to an energy management system that includes power supply and demand between an electric vehicle and a house under management.

  In recent years, the development of a next-generation power network called “smart grid” that incorporates automatic control of power supply and demand in the power network has attracted attention. In the smart grid, power demand and supply can be optimized by controlling the flow of power in the power network not only from the supply side but also from the demand side.

  For example, a battery (storage battery) can be used as a buffer for reducing the peak of power demand and smoothing. That is, the peak of power demand is reduced by using the power of the battery charged from the system power supply at the time of low power demand at the peak time of power demand. As a result, the amount of power purchased from the electric power company can be reduced, and since electric power can be accumulated and used in a time zone where the power cost is low, it also leads to saving of electricity charges in each household.

  Moreover, in power generation using natural energy such as solar power generation, the power generation amount fluctuates depending on the weather and time zone, but the fluctuation may cause instability of the system power supply. The power demand smoothing technique using a battery can also be applied for the purpose of absorbing fluctuations in the amount of power generated. For example, when the amount of power generated by a photovoltaic power generation (PV) device in a house increases and the power supply becomes excessive, the power is stored in the battery. On the other hand, the amount of power generated by the PV device decreases, resulting in excessive power demand. When it becomes, the fluctuation | variation of the electric power generation amount by a PV apparatus can be absorbed by using the electric power accumulate | stored in the battery in a house. The smart grid automatically controls such a power flow.

  A battery for an electric vehicle (for example, an electric vehicle (EV) or a plug-in hybrid vehicle (PHV)) can be used as the battery for the above application. Therefore, in the power grid managed by the smart grid, it is assumed that not only charging of the battery of the vehicle (power supply from the house to the vehicle) but also discharging of the battery (power supply from the vehicle to the house) is actively performed. . Moreover, if the electric power stored in the vehicle battery can be taken into the house and used, there is an advantage that it can cope with an emergency such as a power failure.

  The flow of electric power in the smart grid is managed by an energy management system (EMS) installed in each consumer. EMS puts power generation facilities such as PV devices, large-scale load facilities such as electric water heaters and air conditioners, and power storage facilities such as vehicle batteries under management, so that power demand can be smoothed. Control.

  For example, in the EMS of Patent Document 1 below, the state of the on-vehicle battery (voltage / input / output current and remaining capacity), the secured power amount (the amount of power necessary for daily use by the user) and the remaining power defined based on the travel history The determination of whether to charge or discharge the battery is made in consideration of data such as the amount of electric power (remaining capacity excluding the reserved electric energy and the amount of emergency power) and the time zone.

  On the other hand, Patent Document 2 discloses a “pre-air conditioner” function for operating an in-vehicle air conditioner using a power source outside the vehicle before the vehicle starts running. In the pre-air conditioner function of Patent Document 2, when the vehicle is connected to a power outlet (a power source outside the vehicle) and the in-vehicle battery is fully charged or reaches a predetermined charge amount, the in-vehicle air conditioner is powered by the power from the power outlet. It is what makes it work. According to this technology, since the interior of the vehicle reaches a desired temperature in advance before the vehicle travels, the power consumption of the in-vehicle air conditioner after the start of travel can be suppressed, and the power of the in-vehicle battery can be used to the maximum for travel.

JP 2001-8380 A JP 2010-259308 A

  For example, if the power consumption due to the load decreases during a time period when the amount of power generated by the PV device in the house is large, the power supply is excessive. At this time, if a reverse power flow occurs in which excessive power flows into the system power supply, frequency fluctuations, voltage fluctuations, and the like occur, and the system power supply becomes unstable. The most common way to avoid this problem is to store excess power in the battery to balance power supply and demand. Another method is simply to stop the operation of the PV device.

  However, the method of accumulating excess power in the battery is limited by the capacity of the battery. Although it is sufficient that the capacity of the battery can be made extremely large, the battery is not practical because it is expensive.

  Moreover, in the current PV apparatus, it takes a long time (about 5 minutes at the shortest) from the stop to the restart. Therefore, if the method of stopping the operation of the PV device is taken, it is not a good idea because power generation cannot be resumed for a while even after the excessive power supply state ends. This is particularly inefficient when the overpowered state is temporary.

  On the other hand, in the above-mentioned Patent Document 2, the pre-air conditioner operation is performed when the in-vehicle battery is fully charged or reaches a predetermined charge amount, and the status and plan of power supply and demand are not considered in the operation timing. Therefore, depending on the timing at which the pre-air conditioner operation is performed, there is a possibility that the cost for the pre-air conditioner operation increases.

  The present invention has been made to solve the above-described problems, and provides an energy management system capable of improving the efficiency of a pre-air conditioner and preventing instability of a system power supply by controlling an on-vehicle air conditioner. Objective.

  An energy management system according to a first aspect of the present invention is an energy management system that manages power supply and demand based on power supply from a power generation facility and power demand from a load, and charge / discharge of a battery of an electric vehicle, A power supply / demand situation prediction unit that predicts a future power supply / demand situation and an on-vehicle air conditioner control unit that controls an on-vehicle air conditioner of the electric vehicle based on the prediction of the future power supply / demand situation.

  An energy management system according to a second aspect of the present invention is an energy management system that manages power supply / demand status based on power supply from a power generation facility and power demand from a load, and charging / discharging of a battery of an electric vehicle, An electric power supply / demand situation acquisition unit for acquiring the electric power supply / demand situation and an in-vehicle air conditioner control unit for controlling the in-vehicle air conditioner of the electric vehicle based on the current electric power supply / demand situation.

  According to the first aspect of the present invention, since the in-vehicle air conditioner can be controlled based on the prediction of the future power supply / demand situation, for example, the in-vehicle air conditioner is driven during a period in which the power cost is expected to be reduced. It becomes possible.

  According to the second aspect of the present invention, the on-vehicle air conditioner can be controlled based on the current power supply and demand situation. Therefore, when the power supply is excessive, the on-vehicle air conditioner is operated to consume excess power. Balance can be taken.

It is a block diagram of the charging / discharging system which concerns on embodiment of this invention. It is a principal part block diagram of EMS which concerns on embodiment of this invention. It is a figure for demonstrating the pre air-conditioner operation | movement in the charging / discharging system which concerns on Embodiment 1. FIG. It is a flowchart of the dummy air-conditioner operation | movement in the charging / discharging system which concerns on Embodiment 2. FIG.

  FIG. 1 is a configuration diagram of a charge / discharge system according to an embodiment of the present invention. In the figure, thick arrows between blocks indicate power lines, and thin arrows indicate communication lines.

  The charge / discharge system includes an electric vehicle 30 and a house 10 that is a home of the user of the electric vehicle 30. The house 10 is supplied with power (system power supply) from the power company 20.

  The house 10 is equipped with various electrical equipment such as a residential storage battery 12 that is a power storage facility, a solar power generation device 13 that is a power generation facility, and a home load 14 that is a load facility such as an electric water heater or an air conditioner. These power supply and demand are managed by a home energy management system (HEMS) 11. In the present system, the electric vehicle 30 is also managed by the EMS 11 as one of the electrical equipment belonging to the house 10.

  The EMS 11 has a communication function, such as the amount of power generated by the solar power generation device 13 (power generation equipment) (power supply status), the power consumption by the home load 14 (power demand status), the remaining charge of the storage battery 12 for home use, and the like. Can be obtained. Further, the electric vehicle 30 also has a communication function, and the EMS 11 can acquire a traveling history of the electric vehicle 30 through communication with the electric vehicle 30 or can acquire a storage state of the in-vehicle battery 31 through the battery controller 32. . Furthermore, the EMS 11 can also acquire information related to power control provided from the power company 20.

  The EMS 11 smoothes the power demand in the house 10 so that the amount of power purchased from the power company 20 can be suppressed based on the information, and the power in the house 10 to prevent reverse power flow. Balance supply and demand. At that time, the storage battery 12 for the house 10 and the in-vehicle battery 31 of the electric vehicle 30 are used as buffers.

  For example, when the amount of power generated by the solar power generation device 13 exceeds the amount of power consumed by the household load 14, the EMS 11 charges the residential storage battery 12 and the in-vehicle battery 31 with excess power. On the contrary, when the power generation amount of the solar power generation device 13 becomes an excessive power demand state that does not satisfy the power consumption of the residential storage battery 12, the EMS 11 uses the power stored in the residential storage battery 12 and the in-vehicle battery 31 as a household load. 14.

  Moreover, in this Embodiment, EMS11 is provided with the schedule function using the communication, the charge / discharge schedule of the storage battery 12 and the vehicle-mounted battery 31 set beforehand, operation | movement of the solar power generation device 13, and the household load 14 These operations can be controlled according to a schedule. These schedules may be set by the user's hand, or may be automatically set by the EMS 11. The schedule automatically set by the EMS 11 may use, for example, a template preset in the EMS 11, or the EMS 11 may use the daily charge / discharge pattern of the storage battery 12 and the operation pattern of the solar power generation device 13 and the household load 14. You may learn and optimize them.

  The electric vehicle 30 is an EV, a PHV, or the like that uses electric power stored in the in-vehicle battery 31 as a power source. The battery controller 32 acquires the state of the in-vehicle battery 31 and controls the current / voltage and the like during charging / discharging of the in-vehicle battery 31. As can be seen from the above description, the battery controller 32 can communicate with the EMS 11 of the house 10. The in-vehicle air conditioner 33 has a general function that is used to adjust the temperature in the room of the electric vehicle 30. However, the in-vehicle air conditioner 33 can also communicate with the EMS 11 of the house 10. 33 is configured to be remotely operated.

  A communication method between the EMS 11 and each electric facility in the house 10 and between the EMS 11 and the electric vehicle 30 may be arbitrary. Here, LAN (Local Area Network) communication using a dedicated communication line is assumed, but other communication methods such as CAN (Controller Area Network) communication and PLC (Power Line Communications) using a power line in a cable as a communication line are used. Alternatively, short-distance wireless communication may be used.

  FIG. 2 is a configuration diagram of a main part (portion according to the present invention) of the EMS 11. As shown in the figure, the EMS 11 includes a power supply / demand situation acquisition unit 111, a power supply / demand situation prediction unit 112, a vehicle information acquisition unit 113, and an in-vehicle air conditioner control unit 114.

  The power supply / demand situation acquisition unit 111 receives information on the power supply from the solar power generation device 13 (power generation equipment), the power demand by the household load 14, and the charge state (remaining charge amount, etc.) of the storage battery 12 for home. Based on the current power supply and demand situation. The power supply / demand situation acquisition unit 111 may also be configured to receive information on the power supply / demand situation and power rate of the grid power supply from the power company 20 and obtain the current power supply / demand situation in consideration of these information. .

  The power supply and demand situation prediction unit 112 is the user or the operation schedule of the photovoltaic power generation device 13 and the household load 14 set by the EMS 11 and those learned by the EMS 11 from the past operational history of the photovoltaic power generation device 13 and the domestic load 14. The future power supply and demand situation is predicted based on the operation pattern. In addition, the power supply / demand situation prediction unit 112 receives the power supply / demand situation of the grid power supply from the power company 20 and the information (prediction information) of the power charge, and predicts the future power supply / demand situation taking these information into account. It may be configured.

  The vehicle information acquisition unit 113 acquires information related to the electric vehicle 30 through communication with the electric vehicle 30. Information acquired by the vehicle information acquisition unit 113 from the electric vehicle 30 includes information on the storage status of the in-vehicle battery 31, information on the scheduled use of the electric vehicle 30, information on whether the in-vehicle air conditioner 33 can be controlled from the EMS 11, electric vehicle Information on the presence / absence of persons in 30 rooms, information on settings (target temperature, air volume, etc.) of the on-vehicle air conditioner 33, information on power consumption of the on-vehicle air conditioner 33, information on the temperature of the indoor and surrounding (outside air) of the electric vehicle 30 Is included. The information on the scheduled use of the electric vehicle 30 includes a use start time, a planned travel distance, and the like. The presence / absence of a person inside the electric vehicle 30 can be detected by, for example, a load sensor provided on the seat of the electric vehicle 30.

  The in-vehicle air conditioner control unit 114 relates to the current power supply / demand situation obtained by the power supply / demand situation acquisition unit 111, the future power supply / demand situation predicted by the power supply / demand situation prediction unit 112, and the electric vehicle 30 obtained by the vehicle information acquisition unit 113. The in-vehicle air conditioner 33 is controlled based on the information. The in-vehicle air conditioner 33 can be set by the in-vehicle air conditioner control unit 114 to set a target temperature, an air volume, and the like in addition to on / off switching.

<Embodiment 1>
The first embodiment shows an example in which the system shown in FIGS. 1 and 2 is used for the purpose of improving the efficiency of the pre-air conditioner of the electric vehicle 30.

  FIG. 3 is a diagram for explaining the pre-air conditioner operation according to the first embodiment. The uppermost graph in FIG. 3 shows the power supply status of the house 10 from daytime to nighttime. Since the amount of power generated by the solar power generation device 13 is large in the daytime, the power supply by the solar power generation device 13 is greater than the power demand by the household load 14. In the evening, since the amount of solar radiation decreases, the amount of power generated by the solar power generation device 13 decreases. At night, the amount of power generated by the solar power generation device 13 becomes almost zero. More than supply.

  The power supply / demand situation prediction unit 112 of the EMS 11 is configured based on the operation schedule of the solar power generation device 13 and the household load 14 set by the user or the EMS 11 and the operation patterns learned by the EMS 11. Predict changes.

  Further, in the first embodiment, the power supply / demand situation prediction unit 112 calculates a future change in electricity rate (power cost) from the prediction of the future power supply situation in the house 10. The middle graph in FIG. 3 shows the change in the electricity rate. Since the power generated by the solar power generation device 13 can be used during the daytime, the power cost is low. At night, the power supplied from the power company 20 or the power stored in the residential storage battery 12 and the in-vehicle battery 31 must be used. Therefore, the power cost is high. Here, it is assumed that the electricity bill falls in proportion to the amount of power supply.

  The lowermost graph in FIG. 3 shows the driving power of the in-vehicle air conditioner 33 in the pre-air conditioner operation of the present embodiment. Here, a case where a vehicle is scheduled to be used at night with a small amount of power supply (high power cost) is illustrated.

  In the pre-air conditioner operation when the power supply / demand situation is not considered, as shown by the broken line in the lowermost graph of FIG. 3, the on-vehicle air conditioner 33 is driven with a constant power for a predetermined time immediately before the scheduled use time of the vehicle. As a result, the interior of the electric vehicle 30 is set to the target temperature.

  On the other hand, in the pre-air conditioner operation of the present embodiment, as shown by the solid line, the power supply is relatively based on the power supply / demand situation predicted by the power supply / demand situation prediction unit 112 (the uppermost graph in FIG. 3). By driving the on-vehicle air conditioner 33 with high power when there is a lot (relatively low power cost) and driving the on-vehicle air conditioner 33 with low power when the power supply is relatively low (relatively high power cost), The room is set to the target temperature by the scheduled start time of use of the vehicle 30.

  In the example of FIG. 3, the scheduled start time of the use of the electric vehicle 30 is nighttime when the power cost is high. Therefore, if the on-vehicle air conditioner 33 is driven with high power immediately before that, the power charge will increase. However, in this embodiment, during the evening when the power cost is relatively low, the vehicle-mounted air conditioner 33 is driven with a large amount of power to keep the interior of the electric vehicle 30 near the target temperature, and at night when the power cost is relatively high. Is configured to drive the in-vehicle air conditioner 33 with small electric power (solid line graph). In this case, since the pre-air-conditioner operation is started early, the time for driving the on-vehicle air-conditioner 33 becomes longer, but the use of high-cost power can be suppressed, resulting in a lower power charge for the pre-air-conditioner operation. .

  Thus, by controlling the driving power of the on-vehicle air conditioner 33 in the pre-air conditioner operation in consideration of the prediction of the power supply / demand situation (power cost), an efficient pre-air conditioner operation with reduced power cost is possible.

  The main purpose of the pre-air conditioner operation is to extend the travel distance of the electric vehicle 30 by suppressing the use of the in-vehicle air conditioner 33 after the start of travel. Therefore, if the in-vehicle battery 31 is insufficiently charged by performing the pre-air conditioner operation, the purpose cannot be achieved, which is not preferable. Therefore, when the charge amount of the in-vehicle battery 31 is less than the predetermined amount, it is desirable to prioritize the charge of the in-vehicle battery 31 over the pre-air conditioner operation.

  Moreover, in this Embodiment 1, although it showed that the electric power supply-and-demand condition prediction part 112 calculates the change of the future electricity bill (electric power cost) from the prediction of the future electric power supply condition in the house 10, from the electric power company 20 It may also be configured to receive information on power supply / demand status and power rate information (prediction information) of the system power supply, and to calculate future changes in the electricity rate (power cost) by taking these information into account. For example, in the simplest case, the prediction information of the power charge of the system power supply from the power company 20 may be used as it is.

<Embodiment 2>
Embodiment 2 shows an example in which the system shown in FIGS. 1 and 2 is used for the purpose of countermeasures against reverse power flow due to excessive power supply.

  As described above, as a method of balancing the power supply and demand in an excessive power supply state, a method of charging excessive power to the storage battery or a method of simply stopping the operation of the power generation facility can be considered. However, when the storage battery cannot be charged, such as when the storage battery is fully charged, the former method cannot be taken. In addition, the latter method is not efficient when it takes a long time from stopping to restarting the power generation facility (in the current photovoltaic power generation apparatus, it takes about 5 minutes from stopping to restarting). This is particularly inefficient when the overpowered state is temporary.

  Therefore, in the present embodiment, a method is proposed in which the in-vehicle air conditioner 33 of the electric vehicle 30 is driven to increase the power demand when the power supply is excessive, thereby balancing the power supply and demand. The reason why the vehicle-mounted air conditioner 33 among the devices mounted on the electric vehicle 30 is used is that the power consumption is higher than other vehicle-mounted devices and the power consumption can be adjusted relatively easily. In addition, driving the outdoor in-vehicle air conditioner 33 has less influence on the user than driving the home load 14. Hereinafter, the operation in which the EMS 11 drives the in-vehicle air conditioner 33 for the purpose of increasing the power demand is referred to as “dummy air conditioner operation”.

  If the remaining charge amount of the in-vehicle battery 31 is less than a predetermined amount and can be additionally charged, the power supply / demand balance can be balanced by charging the in-vehicle battery 31 with excess power, so that the dummy There is no need to operate the air conditioner.

  FIG. 4 is a flowchart showing a dummy air conditioner operation according to the present embodiment, which is performed by the EMS 11 using the in-vehicle air conditioner 33.

  The power supply / demand situation acquisition unit 111 monitors the current power supply / demand situation and detects excessive power supply (step ST1). That is, the power supply / demand situation acquisition unit 111 is in a state in which the amount of power generated by the solar power generation device 13 exceeds the power consumption of the household load 14 and charging the residential storage battery 12 and the in-vehicle battery 31 cannot be performed (solar In the case where the remaining amount of charge of the photovoltaic power generation device 13 and the in-vehicle battery 31 is a predetermined amount or more).

  When an excessive power supply is detected by the power supply / demand situation acquisition unit 111, the vehicle information acquisition unit 113 confirms whether the in-vehicle air conditioner 33 can be controlled from the EMS 11 by communication with the electric vehicle 30 (step ST2). When the EMS 11 cannot control the in-vehicle air conditioner 33, the dummy air conditioner operation cannot be performed. Therefore, for example, the operation of the solar power generation device 13 is stopped to balance the power supply and demand.

  If the on-vehicle air conditioner 33 of the electric vehicle 30 can be controlled, the power supply / demand situation prediction unit 112 predicts whether the excessive power supply is temporary (for example, within 5 minutes) (step ST3). This prediction is performed based on the operation schedule and operation history of the household load 14. At this time, when it is determined that the excessive power supply is not temporary, the EMS 11 stops the operation of the solar power generation device 13 (power generation facility). If excessive power supply continues for a long time, it is easier and more efficient to balance the power supply and demand by stopping the operation of the solar power generation device 13 than performing the dummy air conditioner operation.

  On the other hand, if it can be determined that the excessive power supply is temporary, vehicle information acquisition section 113 confirms the presence / absence information of the person in the room of electric vehicle 30 (step ST4). If the interior of the electric vehicle 30 is unmanned, the EMS 11 performs a dummy air conditioner operation for driving the in-vehicle air conditioner 33 in order to increase the power demand. The reason for performing the dummy air conditioner operation only when the room of the electric vehicle 30 is unattended is to reduce the influence on the user. When there is a person in the room of the electric vehicle 30, the power supply and demand is balanced by, for example, stopping the operation of the solar power generation device 13 without performing the dummy air conditioner operation.

  The order of the above steps ST1 to ST4 may be arbitrary. In other words, the dummy air conditioner operation of the present embodiment is (1) the power supply is excessive, (2) the in-vehicle air conditioner 33 can be controlled from the EMS 11, and (3) the excessive power supply is temporary. 4) It is executed when the four conditions that the interior of the electric vehicle 30 is unattended are met.

  When executing the dummy air conditioner operation, the in-vehicle air conditioner control unit 114 calculates set values of various parameters (in-vehicle air conditioner control parameters) used for controlling the in-vehicle air conditioner 33 (step ST5). The in-vehicle air conditioner control parameter is set so that the power consumption of the in-vehicle air conditioner 33 becomes a desired value. Specifically, the target value (target temperature) of the indoor temperature of the electric vehicle 30 and the set value of the air volume are set. It is. For example, if the target temperature is set to a value greatly different from the current room temperature of the electric vehicle 30 or the air volume is set to a strong wind, the power consumption in the in-vehicle air conditioner 33 can be increased.

  The EMS 11 transmits the obtained in-vehicle air conditioner control parameter to the in-vehicle air conditioner 33 of the electric vehicle 30 (step ST6), and drives the in-vehicle air conditioner 33 (step ST7). The in-vehicle air conditioner 33 operates based on the received in-vehicle air conditioner control parameter, and a predetermined power is consumed by the dummy air conditioner operation, thereby balancing the power supply and demand.

  As described above, according to the dummy air conditioner operation according to the present embodiment, it is possible to suppress the reverse power flow due to excessive power supply while suppressing the influence on the user, and to prevent the system power supply from becoming unstable. Further, since it is not necessary to stop the operation of the solar power generation device 13, it is possible to cope with a temporary excessive power supply without waste and to efficiently balance power supply and demand.

  DESCRIPTION OF SYMBOLS 10 Housing, 11 EMS, 12 Residential storage battery, 13 Photovoltaic generator, 14 Domestic load, 20 Electric power company, 30 Electric vehicle, 31 Car battery, 33 Car air conditioner, 32 Battery controller, 111 Electric power supply / demand situation acquisition part, 112 Electricity supply / demand situation prediction unit, 113 vehicle information acquisition unit, 114 vehicle-mounted air conditioner control unit.

Claims (20)

An energy management system that manages the power supply / demand situation based on the power supply from the power generation facility and the power demand from the load, and the charging / discharging of the battery of the electric vehicle,
An electricity supply and demand situation forecasting unit that predicts the future electricity supply and demand situation;
An energy management system comprising: an in-vehicle air conditioner control unit that controls an in-vehicle air conditioner of the electric vehicle based on prediction of the future power supply and demand situation. A vehicle information acquisition unit that acquires information about the electric vehicle by communication with the electric vehicle;
The vehicle information acquisition unit acquires information on a scheduled use time of the electric vehicle,
The vehicle-mounted air conditioner control unit drives the vehicle-mounted air conditioner with high power when the power supply is relatively high based on the prediction of the future power supply and demand situation, and the vehicle mounted air-conditioner when the power supply is relatively low The energy management system according to claim 1, wherein a pre-air conditioner operation is performed to bring the interior of the electric vehicle to a designated temperature by the scheduled use time of the electric vehicle by driving the air conditioner with low power. A vehicle information acquisition unit that acquires information about the electric vehicle by communication with the electric vehicle;
The vehicle information acquisition unit acquires information on a scheduled use time of the electric vehicle,
The power supply / demand situation prediction unit predicts a future change in power cost based on the prediction of the future power supply / demand situation,
The on-vehicle air conditioner control unit drives the on-vehicle air conditioner with high power when the power cost is relatively low based on the prediction of the future change in power cost, and the power cost when the power cost is relatively high. The energy management system according to claim 1, wherein a pre-air conditioner operation is performed to bring the interior of the electric vehicle to a specified temperature by the scheduled use time of the electric vehicle by driving the on-vehicle air conditioner with low power. The vehicle information acquisition unit acquires information on a remaining battery level of the electric vehicle,
The energy management system according to claim 2 or 3, wherein the on-vehicle air conditioner control unit performs the pre-air conditioner operation only when the remaining amount of the battery is equal to or greater than a predetermined amount. The communication content between the vehicle information acquisition unit and the electric vehicle includes information indicating whether the electric vehicle can be controlled from the energy management system. The energy management system described. An energy management system that manages the power supply / demand situation based on the power supply from the power generation facility and the power demand from the load, and the charging / discharging of the battery of the electric vehicle,
A power supply and demand status acquisition unit that acquires the current power supply and demand status;
An energy management system comprising: an in-vehicle air conditioner control unit that controls an in-vehicle air conditioner of the electric vehicle based on the current power supply / demand situation. A vehicle information acquisition unit that acquires information about the electric vehicle by communication with the electric vehicle;
The vehicle information acquisition unit acquires information on a remaining battery level of the electric vehicle,
The power supply / demand situation acquisition unit detects excessive power supply based on the current power supply / demand situation,
7. The on-vehicle air conditioner control unit performs a dummy air conditioner operation that drives the on-vehicle air conditioner and consumes excessive power when the remaining amount of the battery is equal to or greater than a predetermined amount and excessive power supply is detected. The energy management system described. The energy management system according to claim 7, wherein when the remaining amount of the battery is less than the predetermined amount, the battery is charged with the surplus power. The vehicle information acquisition unit further acquires information on the presence or absence of a person in the room of the electric vehicle,
The energy management system according to claim 7 or 8, wherein the in-vehicle air conditioner control unit performs the dummy air conditioner operation only when the interior of the electric vehicle is unattended. The energy management system according to any one of claims 7 to 9, wherein the in-vehicle air conditioner control unit controls electric power consumed in the dummy air conditioner operation by controlling a set temperature of the in-vehicle air conditioner. The communication content between the vehicle information acquisition unit and the electric vehicle includes information indicating whether the electric vehicle can be controlled from the energy management system. The energy management system described. It is further equipped with a power supply and demand situation prediction unit that predicts the future power supply and demand situation,
The energy management system according to claim 6, wherein the in-vehicle air conditioner control unit controls the operation of the in-vehicle air conditioner of the electric vehicle based on the prediction of the current power supply / demand situation and the future power supply / demand situation. A vehicle information acquisition unit that acquires information about the electric vehicle by communication with the electric vehicle;
The vehicle information acquisition unit acquires information on a remaining battery level of the electric vehicle,
The power supply / demand situation acquisition unit detects excessive power supply based on the current power supply / demand situation,
The power supply / demand situation prediction unit predicts the duration of excessive power supply,
The on-vehicle air conditioner control unit drives the on-vehicle air conditioner to generate excessive power when the remaining amount of the battery is equal to or greater than a predetermined amount and excessive power supply is detected and the duration is predicted to be less than a predetermined length. The energy management system of Claim 12 which performs the dummy air-conditioner operation | movement which consumes. The energy management system according to claim 13, wherein an operation of the power generation facility is stopped when an excessive power supply is detected and the prediction of the duration is not less than a predetermined length. The energy management system according to claim 13 or 14, wherein when the remaining amount of the battery is less than the predetermined amount, the battery is charged with the surplus power. The vehicle information acquisition unit further acquires information on the presence or absence of a person in the room of the electric vehicle,
The energy management system according to any one of claims 13 to 15, wherein the in-vehicle air conditioner control unit performs the dummy air conditioner operation only when an interior of the electric vehicle is unattended. The energy management system according to any one of claims 13 to 16, wherein the on-vehicle air conditioner control unit controls electric power consumed by the dummy air conditioner operation by controlling a set temperature of the on-vehicle air conditioner. The energy management system according to any one of claims 13 to 17, wherein the power supply / demand situation prediction unit predicts a continuation time of the excessive power supply based on an operation schedule of a load. The energy management system according to any one of claims 13 to 17, wherein the power supply / demand situation prediction unit predicts a continuation time of the excessive power supply based on a load operation history. 20. The communication content between the vehicle information acquisition unit and the electric vehicle includes information indicating whether or not the electric vehicle can be controlled from the energy management system. The energy management system described.

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