Power supply system and power supply method

Abstract

To properly derive chargeable electric energy which does not exceed contracted received electric energy in a facility while properly coping with demand fluctuation of a power load in the facility, and to properly control a charging rate of an electric vehicle while improving usability.SOLUTION: In a predetermined contract period, chargeable electric power amount derivation control is executed in which a value obtained by subtracting the first received electric power amount prediction value from the contracted received electric power amount is derived as a chargeable electric power amount that can be charged to the electric vehicle EV in the target contract period until the second received electric power amount prediction value is derived, and after the second received electric power amount prediction value is derived, a value obtained by subtracting the second received electric power amount prediction value from the contracted received electric power amount is derived as a chargeable electric power amount that can be charged to the electric vehicle EV after the determination time point in the target contract period.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply system including a power supply control unit that controls charging of a storage battery mounted on an electric vehicle in a facility having a charging terminal capable of charging the storage battery, and a power supply method. [Background technology]

[0002] BACKGROUND ART In recent years, a power supply system and a power supply method have become known in which a vehicle having a storage battery is connected to a facility such as a house or a business office, and the storage battery is charged with power received from the facility (see Patent Document 1). The power supply system disclosed in Patent Document 1 derives the chargeable energy amount, which is the amount of power that can be allocated to charging the electric vehicle's storage battery, based on the contracted amount of power to be received at the facility for a specified contract period, the charging rate of the electric vehicle's storage battery, and the predicted amount of power used by the facility's power load for a specified contract period calculated by a prediction based on past demand, and controls the charging of the electric vehicle's storage battery at the facility based on the chargeable energy amount. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-168499 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in Patent Document 1, the amount of chargeable energy calculated to be used for charging control of the storage battery of an electric vehicle is not calculated taking into consideration the amount of energy charged to the storage battery of the electric vehicle. As a result, in some cases, the amount of received energy, including the amount of energy charged to the storage battery during the contract period, may exceed the contracted amount of received energy, leaving room for improvement. Furthermore, in the technology disclosed in Patent Document 1, to charge the storage battery of an electric vehicle, the user registers the remaining battery capacity and target charging period of the electric vehicle's storage battery from a charging terminal to which the storage battery of the electric vehicle is connected, and charging control of the storage battery begins when the registration is complete. However, with this specification, the user needs to register the remaining battery capacity (charging rate) and target charging period of the storage battery each time they use the device, which leaves room for improvement in terms of usability.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a power supply system and a power supply method that can appropriately respond to fluctuations in power load demand at a facility, while appropriately deriving the amount of chargeable power that does not exceed the contracted amount of power received at the facility, and that can appropriately control the charging rate of the storage battery of an electric vehicle while improving usability. [Means for solving the problem]

[0006] The power supply system to achieve the above objectives is as follows: A power supply system including a power supply control unit that controls charging of a storage battery mounted on an electric vehicle at a facility having a charging terminal capable of charging the storage battery, the system having a characteristic configuration including: the power supply control unit is configured to be able to receive information that allows calculation of an amount of stored power supplied from the charging terminal in the facility to the storage battery of the electric vehicle and a facility power consumption amount obtained by subtracting the stored power amount from an amount of received power during a predetermined contract period in which a predetermined contracted amount of received power at the facility is determined; The power supply control unit a first received power amount prediction control that derives a first received power amount prediction value as a prediction value of the received power amount during the target contract period by machine learning using at least the received power amount during the contract period that is earlier than the target contract period as an index; a second received power amount prediction control that derives a second received power amount prediction value, which is a prediction value of the received power amount at the end of a target contract period, from an increase rate of the facility power consumption calculated from a change over time in the facility power consumption from the start of the target contract period to a predetermined judgment time, and a total received power amount that is the sum of the stored power amount and the facility power consumption from the start of the target contract period to the judgment time; During the specified contract period, until the second predicted value of received power amount is derived, a value obtained by subtracting the first predicted value of received power amount from the contracted received power amount is derived as the amount of chargeable power that can be charged to the storage battery of the electric vehicle during the contract period in question, and after the second predicted value of received power amount is derived, chargeable power amount derivation control is executed to derive a value obtained by subtracting the second predicted value of received power amount from the contracted received power amount as the amount of chargeable power that can be charged to the storage battery of the electric vehicle during the contract period in question from the determination time point onwards.

[0007] A power supply method for achieving the above object includes: A power supply method for controlling charging of a storage battery mounted on an electric vehicle in a facility having a charging terminal capable of charging the storage battery, the method comprising the steps of: the facility power consumption control system is configured to be able to specifically receive the amount of stored power supplied from the charging terminal in the facility to the storage battery of the electric vehicle and the facility power consumption amount obtained by subtracting the amount of stored power from the amount of received power during a predetermined contract period for which a predetermined contracted amount of received power at the facility is determined, a first received power amount prediction control that derives a first received power amount prediction value as a prediction value of the received power amount during the target contract period by machine learning using at least the received power amount during the contract period that is earlier than the target contract period as an index; a second received power amount prediction control that derives a second received power amount prediction value, which is a prediction value of the received power amount at the end of a target contract period, from an increase rate of the facility power consumption calculated from a change over time in the facility power consumption from the start of the target contract period to a predetermined judgment time, and a total received power amount that is the sum of the stored power amount and the facility power consumption from the start of the target contract period to the judgment time; During the specified contract period, until the second predicted value of received power amount is derived, a value obtained by subtracting the first predicted value of received power amount from the contracted received power amount is derived as the amount of chargeable power that can be charged to the storage battery of the electric vehicle during the contract period in question, and after the second predicted value of received power amount is derived, chargeable power amount derivation control is executed to derive a value obtained by subtracting the second predicted value of received power amount from the contracted received power amount as the amount of chargeable power that can be charged to the storage battery of the electric vehicle during the contract period in question from the determination time point onwards.

[0008] According to the above characteristic configuration, during a specified contract period, immediately after the start of the contract period, the first received power amount prediction control performs machine learning using at least the received power amount during the contract period prior to the target contract period as an indicator, and calculates the amount of power that can be charged to the storage battery using the first received power amount prediction value as a predicted value of the received power amount during the target contract period. Here, the first received power amount prediction value is a prediction value obtained by machine learning using the received power amount during the past contract period as an indicator, so it cannot be said to correspond to sudden fluctuations in power demand during the current contract period, and in some cases, there is a risk that the received power amount during the contract period will exceed the contracted received power amount during the contract period. Therefore, according to the power supply system having the above-described characteristic configuration, the second received power amount prediction control derives a second received power amount prediction value, which is a prediction value of the received power amount at the end of the target contract period, from the rate of increase in facility power consumption calculated from the change over time in facility power consumption from the start of the target contract period to a predetermined judgment point in time, and the total received power amount, which is the sum of the stored power amount and facility power consumption from the start of the target contract period to the judgment point in time, and after the second received power amount prediction value is derived during the target contract period, the second received power amount prediction value is used to calculate the amount of power that can be charged to the storage battery. Here, the second received energy forecast value, which is a forecast value of the amount of received energy at the end of the target contract period, is derived from the rate of increase in facility energy consumption calculated from the change over time in facility energy consumption from the start of the target contract period to a specified judgment point in time, and the total received energy, which is the sum of the stored energy and facility energy consumption from the start of the target contract period to the judgment point in time. Therefore, it is a forecast of the amount of received energy at the end point in a form that does not include the stored energy from the judgment point in time to the end point, and the value obtained by subtracting the second received energy forecast value from the contracted received energy amount is a forecast value that indicates the surplus of net received energy if the electric vehicle's storage battery is not charged from the judgment point in time to the end point. Therefore, it is possible to derive the amount of chargeable energy as a predicted value, which indicates the margin of net received energy in the case where the storage battery of the electric vehicle is not charged from the time of determination until the end of the contract period. Furthermore, based on the amount of chargeable energy, it is possible to charge the storage battery appropriately. Here, the chargeable amount of energy derived from the second received energy amount prediction value takes into account sudden demand for electricity, including charging power to the storage battery, up until the time of judgment, so that the amount of received electricity during the contract period is less likely to exceed the contracted amount of received electricity due to sudden demand for electricity.

[0009] Furthermore, according to the above characteristic configuration, users of electric vehicles do not need to register the remaining battery capacity (charging rate) of the storage battery and the target charging period each time they use the vehicle, which can also improve usability for users.

[0010] As described above, it is possible to realize a power supply system and a power supply method that can appropriately respond to fluctuations in power load demand at a facility, while appropriately deriving the amount of chargeable power that does not exceed the contracted amount of power received at the facility, and that can appropriately control the charging rate of the electric vehicle's storage battery while improving usability.

[0011] Further characteristic configurations of the power supply system include: In a graph with the vertical axis representing the amount of power and the horizontal axis representing the time, the power supply control unit, in the second received power amount prediction control, sets a slope of the increase rate of the facility power consumption amount, and sets a value on an approximate line of points indicating the total received power amount at the time of determination as the second received power amount prediction value after the time of determination, The chargeable energy amount is calculated by subtracting the value on the approximate line at the end of the contract period from the contracted amount of received energy.

[0012] In the second received power amount prediction control, it is preferable that the power supply control unit uses the rate of increase in facility power consumption as the slope in a graph with the vertical axis representing power amount and the horizontal axis representing time, and uses the value on an approximate straight line of points indicating the total received power amount at the time of judgment as the second received power amount prediction value from the time of judgment, and derives the chargeable power amount as the value obtained by subtracting the value on the straight line at the end of the contract period from the contracted received power amount. This makes it possible to appropriately derive the amount of chargeable energy as a predicted value, which indicates the surplus of net received energy in the event that the electric vehicle's storage battery is not charged from the time of determination until the end of the contract period.

[0013] Further characteristic configurations of the power supply system include: The second received power amount prediction control is executed at a plurality of determination points during the target contract period for each determination period that is shorter than the contract period, The power supply control unit derives and updates the chargeable energy amount for the target contract period at each determination time point in the chargeable energy amount derivation control.

[0014] According to the above characteristic configuration, the chargeable energy amount taking into account fluctuations in the amount of received energy in real time during the current contract period can be updated and derived at each judgment point. Therefore, for example, by using the chargeable energy amount to control the charging of the storage battery, it is possible to more effectively prevent the amount of received energy during the contract period from exceeding the contracted amount of received energy.

[0015] Further characteristic configurations of the power supply system include: The power supply control unit executes charging control to charge the storage battery of the electric vehicle with an amount of power up to the chargeable energy amount after the determination point in the contract period when the chargeable energy amount derived in the chargeable energy amount derivation control is a positive value, and to stop charging the storage battery of the electric vehicle after the determination point in the contract period when the chargeable energy amount derived in the chargeable energy amount derivation control is a value equal to or less than zero.

[0016] According to the above characteristic configuration, if the chargeable energy amount derived in the chargeable energy amount derivation control is a positive value, the power supply control unit charges the electric vehicle's storage battery with an amount of energy up to the chargeable energy amount after the determination point of the contract period, thereby more effectively preventing the amount of received energy during the contract period from exceeding the contracted received energy amount. On the other hand, if the chargeable energy amount derived in the chargeable energy amount derivation control is a value below zero, charging of the electric vehicle's storage battery is stopped from the judgment point onwards, making it less likely that the amount of received energy will exceed the contracted amount of received energy during the contract period.

[0017] Further characteristic configurations of the power supply system include: the power supply control unit executes a surplus chargeable energy derivation control to derive a value obtained by multiplying the derived chargeable energy by a surplus rate smaller than 1, or a value obtained by subtracting a predetermined surplus amount from the derived chargeable energy, as the surplus chargeable energy; In the charging control, if the surplus chargeable energy derived in the surplus chargeable energy derivation control is a positive value, an amount of energy up to the surplus chargeable energy is charged into the storage battery of the electric vehicle after the determination point, and if the surplus chargeable energy derived in the surplus chargeable energy derivation control is a value equal to or less than zero, charging of the storage battery of the electric vehicle after the determination point is stopped.

[0018] According to the above characteristic configuration, charging control of the storage battery is performed based on the surplus chargeable energy amount, which is a certain margin of the chargeable energy amount, so that it is possible to more effectively prevent the amount of received energy during the contract period from exceeding the contracted amount of received energy amount due to charging of the electric vehicle. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic configuration diagram of a power supply system according to an embodiment; [Figure 2] FIG. 3 is a control flow diagram of power supply control according to the embodiment. [Figure 3] FIG. 3 is a control flow diagram of power supply control according to the embodiment. [Figure 4] FIG. 10 is a graph showing a calculation process of the chargeable energy amount for a predetermined contract period. [Figure 5] FIG. 10 is a graph showing a calculation process of the chargeable energy amount for a predetermined contract period. DETAILED DESCRIPTION OF THE INVENTION

[0020] The power supply system and power supply method according to the embodiment are capable of appropriately deriving the amount of chargeable power that does not exceed the contracted amount of power received at the facility while appropriately responding to fluctuations in power load demand at the facility, and are also capable of appropriately controlling the charging rate of the storage battery of an electric vehicle while improving usability.

[0021] A power supply system 100 and a power supply method according to an embodiment will be described below with reference to FIGS. As shown in FIG. 1, the power supply system 100 according to the embodiment is configured to include a power supply control device S (an example of a power supply control unit) that controls charging of storage batteries B in a facility F having a plurality of charging terminals C capable of charging each of the storage batteries B mounted on an electric vehicle EV.

[0022] The power supply system 100 is configured so that a power supply control device S that controls charging and a facility F such as a home or an office can communicate with each other via an information communication line N. A power line D1 is installed in the facility F, and the power line D1 is connected to a commercial power system SD so as to be able to supply power. Furthermore, a plurality of charging terminals C are connected in parallel to the power line D1, and various power consumption devices PD, which are electrical equipment, are also connected to the power line D1. Furthermore, the power line D1 is provided with a first power measurement unit K1 that measures all received power received from the commercial power system SD, and a second power measurement unit K2 that measures only the power consumed by the power consumption devices PD in the facility F. That is, in the power supply system 100 according to this embodiment, the charging power charged to the storage battery B from the multiple charging terminals C is the amount obtained by subtracting the power consumption measured by the second power measurement unit K2 from the received power measured by the first power measurement unit K1. The power supply control device S is configured to be able to receive, via an information communication line N, the power measured by the first power measurement unit K1 and the second power measurement unit K2. That is, the power supply control device S is configured to be able to receive information that can be used to calculate the amount of stored power supplied from the charging terminal C in the facility F to the storage battery B of the electric vehicle EV, and the facility power consumption amount obtained by subtracting the amount of stored power from the amount of received power during a specified contract period in which a specified contracted amount of received power at the facility F is determined.

[0023] The charging terminal C is electrically connected to the power line D1 and is configured to include, for example, a power conversion circuit unit and an operation control unit that controls the operation of the power conversion circuit unit, and is provided with a plug P that can supply a predetermined amount of power to a connection destination. In this embodiment, the charging terminal C is a normal charging terminal C1 that charges the storage battery B at a normal speed, or a rapid charging terminal C2 that charges the storage battery B at a speed faster than the normal speed. The normal charging terminal C1 can be, for example, a terminal that can be charged with an output of 3 to 6 kW at 200V AC, and the rapid charging terminal C2 can be, for example, a terminal that can be charged with an output of 10 to 180 kW at 400 to 500V DC.

[0024] The electric vehicle EV has a vehicle-side terminal EVa to which a plug P of a charging terminal C in a facility F can be connected, and drives a traction motor using power from a storage battery B, and includes plug-in hybrid vehicles and the like.

[0025] Furthermore, the power supply control device S is configured to be able to execute charging rate acquisition control, which sequentially acquires the actual charging rate from the storage battery B connected to the charging terminal C, which is the current amount of stored electricity divided by the storage capacity of the storage battery B and multiplied by 100. In this embodiment, the power supply control device S is configured to be able to receive the actual charging rate from the charging terminal C via the information communication line N.

[0026] Now, the power supply control device S according to this embodiment executes the following control to appropriately control the charging rate of the electric vehicle EV while improving usability and without exceeding the contracted amount of received power (target amount of received power) at the facility F, while also responding appropriately to fluctuations in demand of the power consumption device PD (an example of a power load) at the facility F.

[0027] In the following description, graphs shown in FIGS. 4 and 5 will be used to illustrate the calculation process of the chargeable energy amount for a predetermined contract period. Incidentally, FIG. 5 is a graph showing plotted values ​​of facility power consumption of only the power consumption device PD (excluding the amount of power stored in the storage battery B at the charging terminal C) at each predetermined time point (T1, T2, T3, etc.) during the contract period (for example, a target period for which the contracted amount of received power is determined, a 30-minute period) at facility F, and the slope a of an approximated line derived by approximating these values ​​using the least squares method or the like. FIG. 4 is a graph showing values ​​plotted at each predetermined time point (T1, T2, T3, etc.) of the facility power consumption of the power consumption device PD and the total amount of stored power at all charging terminals C during the contract period at facility F, and a straight line (dashed dotted line) passing through the value (total amount of power) at the latest time point (determination time point: T5 in FIG. 4) with the above-mentioned slope a.

[0028] The power supply control device S first executes the following first received power amount prediction control and second received power amount prediction control. The first received power amount prediction control is a control that derives a first received power amount prediction value (not shown) as a predicted value of the received power amount during the target contract period by machine learning using at least the received power amount during a contract period prior to the target contract period as an indicator. To further explain the first received power amount prediction control, the first received power amount prediction value is derived by performing machine learning using indicators such as the amount of received power during the past contract period, the month, day of the week, time, temperature, and the business / closure attributes of facility F. The first received power amount prediction control is executed for each contract period and at a scheduled time (for example, 5 minutes) before the contract period.

[0029] The second received power amount prediction control is a control that derives a second received power amount prediction value (shown in FIG. 4), which is a prediction value of the received power amount at the end of the target contract period (The in FIG. 4), from the increase rate (a in FIG. 5) of the facility power consumption calculated from the change over time in the facility power consumption (power consumption amount of only the power consumption device PD) from the start of the target contract period (Ths in FIG. 5) to a predetermined judgment time (T5 in FIG. 5) during the target contract period, and the total received power amount, which is the sum of the stored power amount in all charging terminals C and the facility power consumption amount in the power consumption device PD from the start of the target contract period (Ths in FIG. 4) to the judgment time (T5 in FIG. 4).

[0030] To further explain the second received power amount prediction control, in the graph of Figure 5, where the vertical axis represents power amount and the horizontal axis represents time, the power supply control device S derives the rate of increase in the facility power consumption amount for the power consumption device PD alone (the power consumption amount in the facility F excluding the amount of power stored in the charging terminal C during the contract period) as slope a, and in the graph of Figure 4, the point indicating the total received power amount (the sum of the facility power consumption amount and the amount of power stored in all the charging terminals C) from the start of the contract period (Ths in Figure 4) to the judgment time (T5 in Figure 4) at the judgment time (T5 in Figure 4) is the value on the line (the value on the dot-dash line in Figure 4) that passes through with the above slope a after the judgment time, as the second received power amount prediction value. Furthermore, the power supply control device S derives the chargeable energy by subtracting the value on the line at the end point The of the contract period (second received energy amount predicted value) from the contracted received energy amount (target received energy amount). In addition, as shown in Figures 4 and 5, the second received power amount prediction control is executed at multiple judgment points (T2, T3, etc. in Figures 4 and 5) for each judgment period shorter than the contract period during the target contract period, and the power supply control device S derives and updates the chargeable power amount during the target contract period at each judgment point in the chargeable power amount derivation control.

[0031] Furthermore, during a specified contract period, until the second received power amount predicted value is derived, the power supply control device S derives a value obtained by subtracting the first received power amount predicted value from the contracted received power amount (or a target received power amount set for the contracted received power amount) as the amount of chargeable power that can be charged to the electric vehicle EV during the target contract period, and after the second received power amount predicted value is derived, executes chargeable power amount derivation control to derive a value obtained by subtracting the second received power amount predicted value from the contracted received power amount as the amount of chargeable power that can be charged to the electric vehicle EV during the target contract period from the determination point in time onwards. In other words, the power supply control device S uses the first received power amount prediction value as the received power amount prediction value during the judgment period from the start of the contract period to the first judgment point, and uses the second received power amount prediction value as the received power amount prediction value during the judgment period from the first judgment point to the end of the contract period The.

[0032] Furthermore, if the chargeable energy amount derived in the chargeable energy amount derivation control is a positive value, the power supply control device S executes charging control to charge the storage battery B of the electric vehicle EV with an amount of energy up to the chargeable energy amount after the determination point of the contract period, and if the chargeable energy amount derived in the chargeable energy amount derivation control is a value of zero or less, to stop charging the storage battery B of all electric vehicles EV after the determination point.

[0033] So far, we have explained the control related to the derivation of the chargeable energy amount after the judgment point by the power supply control device S. Below, we will explain the control related to the allocation of the chargeable energy amount to the storage batteries B of multiple electric vehicles EV.

[0034] First of all, it is preferable that the power supply control device S has information regarding the charging rate of the storage battery B when allocating the chargeable energy amount to the storage battery B, but depending on the type of charging terminal C, it may not be possible to obtain the charging rate of the storage battery B connected to the charging terminal C from the charging terminal C.

[0035] Therefore, in the power supply system 100 according to this embodiment, the power supply control device S executes the following provisional charging rate setting control, priority matching setting control, charging amount setting control, allocation rate derivation control, and charging power suppression control in the order listed. In the following explanation, the following charging terminal C may be referred to as an example, using the numerical values ​​in Table 1, which shows the charge rate of the storage battery B connected to the normal charging terminals C1a to C1e and the rapid charging terminal C2a, and Table 2, which is a specific example of the allocated power amount allocated to each storage battery B.

[0036] [Table 1]

[0037] [Table 2]

[0038] The provisional charging rate setting control is a control in which, in a charging rate acquisition control that sequentially acquires the actual charging rate from a storage battery B connected to each of a plurality of charging terminals C at a predetermined priority setting point in time, if the actual charging rate of the storage battery B connected to the charging terminal C cannot be acquired, a predetermined provisional charging rate is set for the storage battery B whose charging rate cannot be acquired. In the temporary charging rate setting control, the power supply control device S sets the temporary rapid charging rate as the temporary charging rate when the charging terminal C is a rapid charging terminal C2 to be higher than the temporary normal charging rate as the temporary charging rate when the charging terminal C is a normal charging terminal C1. In the example shown in Table 2, the provisional rapid charging rate is set to 90% and the provisional normal charging rate is set to 95%. The provisional rapid charging rate and the provisional normal charging rate can be values ​​stored in a storage unit (not shown) of the power supply control device S. Furthermore, for example, the provisional rapid charging rate can be the average value of the charging rate of the storage battery B connected to the rapid charging terminal C2 at the time of connection over a predetermined period (e.g., a period of about one week or one month), and the provisional normal charging rate can be the average value of the charging rate of the storage battery B connected to the normal charging terminal C1 at the time of connection over a predetermined period (e.g., a period of about one week or one month).

[0039] The priority matching setting control is a control for setting a charging priority for charging a storage battery B connected to a charging terminal C at a priority matching setting point in time, based on an actual charging rate, a provisional rapid charging rate, and a provisional normal charging rate. Here, the priority matching setting point in time can be, for example, a determination point in time (T1, T2, T3, etc. in FIGS. 4 and 5) for each determination period (e.g., a 5-minute period) within a contract period (e.g., a 30-minute period), as shown in FIGS. In the priority ranking setting control, when the actual charging rate, the provisional rapid charging rate, and the provisional normal charging rate are used as charging rates, the power supply control device S sets a higher priority ranking for a storage battery with a lower charging rate. For example, the priority ranking is set to a value obtained by subtracting the charging rate from 100. Specifically, as shown in Table 2, if the charging rate (actual charging rate) is 20%, the priority level is set to 80; if the charging rate (actual charging rate) is 50%, the priority level is set to 50; if the charging rate (tentative fast charging rate) is 90%, the priority level is set to 10; and if the charging rate (tentative normal charging rate) is 95%, the priority level is set to 5.

[0040] The power supply control device S executes charging amount setting control to set a larger allocated amount of chargeable energy during the contract period for a storage battery B connected to a charging terminal C with a higher priority set in the priority setting control. More specifically, when the power supply control device S sets one of the storage batteries B connected to each of the multiple charging terminals C at the time of priority matching setting as the target storage battery B, it executes allocation rate derivation control to derive the value obtained by dividing the priority matching of the target storage battery B by the sum of the priority matching of all storage batteries B connected to the multiple charging terminals C at the time of priority matching setting as the allocation rate of the target storage battery B, and in the charging amount setting control, it sets the value obtained by multiplying the allocation rate of the target storage battery B by the chargeable energy amount as the allocated energy amount to the target storage battery B for the contract period. When the allocated energy amount is set in this manner, in an example where the chargeable energy amount is 60 kWh as shown in Table 2, a relatively large amount of charging energy of 31 kWh can be allocated to Battery B, which has a relatively low charging rate of 20% (Battery B, which has a relatively high allocation rate of 0.516), and a relatively small amount of charging energy of 19 kWh can be allocated to Battery B, which has a relatively high charging rate of 50% (Battery B, which has a relatively high allocation rate of 0.323).Here, for Battery B, which has a provisional normal charging rate or provisional rapid charging rate set, the amount of charging energy allocated to Battery B, which has a provisional rapid charging rate set, (4 kWh) can be set to be greater than the amount of charging energy allocated to Battery B, which has a provisional normal charging rate set (2 kWh).

[0041] Furthermore, when the allocated power obtained by dividing the allocated amount of power of the target storage battery B during the contract period by the contract period exceeds the rated output of the charging terminal C to which the target storage battery B is connected, the power supply control device S prevents the charging terminal C from becoming overloaded by executing charging power suppression control, in which the charging terminal C to which the target storage battery B is connected charges the target storage battery B at the rated output.

[0042] Next, a power supply method according to the embodiment will be described based on the control flow shown in Figures 2 and 3. The power supply control device S executes the control flow shown in Figures 2 and 3 from a predetermined time (for example, 5 minutes) before the contract period (a period of 30 minutes) until the end of the contract period.

[0043] The power supply control device S acquires the contracted amount of received power of the facility F from a management server of the power supply company (not shown) (#01) and sets it as a target amount of received power. Furthermore, the power supply control device S performs machine learning using at least the amount of received power in a contract period prior to the target contract period as an index through first received power amount prediction control, and derives a first received power amount prediction value as a predicted value of the amount of received power in the target contract period (#02).

[0044] Next, the power supply control device S waits for a predetermined time (#04) until the start of the contract period has passed (No in #03), and once the start of the contract period has passed (Yes in #03), it acquires the charging rate (actual charging rate) of the storage battery B connected from the facility F to the charging terminal C from the charging terminal C in the facility F (#05). If the judgment period has not elapsed since the start of the contract period (No in #06), the power supply control device S derives the amount of chargeable energy for the current contract period by subtracting the first predicted value of received energy derived in step #02 from the target amount of received energy (#09). On the other hand, if the judgment period has elapsed since the start of the contract period (Yes in #06), the power supply control device S derives a second received power amount prediction value using the second received power amount prediction control (#07), and derives the amount of chargeable power for the current contract period by subtracting the second received power amount prediction value from the target received power amount (#08).

[0045] After step #08 or step #09, the power supply control device S determines whether the derived chargeable amount is greater than 0 (#10), and if the chargeable amount is 0 or less (No in #10), stops charging at all charging terminals C (does not start charging at all charging terminals C), and if the chargeable amount is greater than 0 (Yes in #10), executes the following control of steps #11 to #18.

[0046] The power supply control device S calculates the total amount of power that would be consumed if all charging terminals C were driven at rated output from the present time until the end of the contract period (#11), and if the calculated total amount of power is less than or equal to the chargeable amount (Yes in #12), it controls all charging terminals C to be driven (charged) at rated output (#18).

[0047] On the other hand, if the derived total amount of power exceeds the chargeable amount (No in #12), the power supply control device S executes temporary charging rate setting control (#13), sets the value obtained by subtracting the charging rate from 100 as the priority sum (#14), uses the derived priority sum to derive the allocation rate of the amount of chargeable power to each storage battery B connected to the charging terminal C through allocation rate derivation control (#15), sets the amount of power allocated to each storage battery through charging amount setting control using the derived allocation rate (#16), and controls so that the set allocated amount of power is charged to each storage battery B (#17).

[0048] [Another embodiment] (1) In the power supply system 100 according to the above embodiment, the configuration of the facility F having a plurality of charging terminals C capable of charging each of the storage batteries B mounted on the electric vehicle EV has been described. However, the number of charging terminals C provided in the facility F may be one instead of multiple.

[0049] (2) In the above embodiment, an example of a configuration in which the charging terminal C includes a normal charging terminal C1 and a rapid charging terminal C2 is shown, but the charging terminal C may also be configured to include only one of the normal charging terminal C1 or the rapid charging terminal C2.

[0050] (3) In the power supply system 100 shown in the above embodiment, the power supply control device S executes surplus chargeable energy derivation control to derive a value obtained by multiplying the derived chargeable energy by a surplus rate smaller than 1, or a value obtained by subtracting a predetermined surplus amount from the derived chargeable energy, as the surplus chargeable energy. In the charging control, if the surplus chargeable energy derived in the surplus chargeable energy derivation control is a positive value, the power supply control may be controlled to charge the storage battery B of the electric vehicle EV with an amount of energy up to the surplus chargeable energy from the determination point onwards, and if the surplus chargeable energy derived in the surplus chargeable energy derivation control is a value equal to or less than zero, to stop charging the storage battery B of the electric vehicle EV from the determination point onwards.

[0051] (4) In the above embodiment, the charging control, charging rate acquisition control, provisional charging rate setting control, priority matching setting control, chargeable energy amount derivation control, charging amount setting control, allocation rate derivation control, and charging power suppression control do not necessarily have to be executed.

[0052] (5) In the above embodiment, an example configuration was shown in which the power supply control device S is configured to be able to receive the charging rate of the storage battery B of the electric vehicle EV from the charging terminal C to which the storage battery B is connected via the information and communication line N. As another configuration example, the power supply control device S may be configured to be able to receive the charging rate of the storage battery B via the information communication line N from the electric vehicle EV in which the storage battery B is connected to a predetermined charging terminal C.

[0053] (6) In the above embodiment, the power supply control device S controls charging from the charging terminal C to the storage battery B. This is an example of the configuration. As another configuration example, the power supply control device S may be configured to control charging from the charging terminal C to the storage battery B, and also control discharging from the storage battery B to the facility F (on the side of the charging terminal C).

[0054] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0055] The power supply system and power supply method of the present invention can be effectively used as a power supply system and power supply method that can appropriately respond to fluctuations in power load demand at a facility, while appropriately deriving the amount of chargeable power that does not exceed the contracted amount of power received at the facility, and can appropriately control the charging rate of an electric vehicle while improving usability. [Explanation of symbols]

[0056] 100: Power supply system B: Storage battery C: Charging terminal C1: Standard charging terminal C2: Fast charging terminal EV: Electric vehicle F: Facility S: Power supply control device SD: Commercial power system a: Inclination

Claims

1. A power supply system including a power supply control unit that controls charging of a storage battery mounted on an electric vehicle at a facility having a charging terminal capable of charging the storage battery, the power supply control unit is configured to be able to receive information that allows calculation of an amount of stored power supplied from the charging terminal in the facility to the storage battery of the electric vehicle and a facility power consumption amount obtained by subtracting the stored power amount from an amount of received power during a predetermined contract period in which a predetermined contracted amount of received power at the facility is determined; The power supply control unit a first received power amount prediction control that derives a first received power amount prediction value as a prediction value of the received power amount during the target contract period by machine learning using at least the received power amount during the contract period that is earlier than the target contract period as an index; a second received power amount prediction control that derives a second received power amount prediction value, which is a prediction value of the received power amount at the end of a target contract period, from an increase rate of the facility power consumption calculated from a change over time in the facility power consumption amount from the start of the target contract period to a predetermined judgment time point, and a total received power amount that is the sum of the stored power amount and the facility power consumption amount from the start of the target contract period to the judgment time point; and, after the second predicted amount of received power is derived, deriving a value obtained by subtracting the second predicted amount of received power from the contracted amount of received power as the amount of chargeable power that can be charged to the storage battery of the electric vehicle during the target contract period from the determination point in time onwards during the target contract period.

2. In a graph with the vertical axis representing the amount of power and the horizontal axis representing the time, the power supply control unit, in the second received power amount prediction control, sets a slope of the increase rate of the facility power consumption amount, and sets a value on an approximate line of points indicating the total received power amount at the time of determination as the second received power amount prediction value after the time of determination, The power supply system according to claim 1 , wherein the chargeable energy amount is calculated by subtracting a value on the approximate line at the end of the contract period from the contracted amount of received energy.

3. The second received power amount prediction control is executed at a plurality of determination points in each determination period that is shorter than the contract period during the target contract period, The power supply system according to claim 1 or 2, wherein the power supply control unit, in the chargeable energy amount derivation control, derives and updates the chargeable energy amount for the target contract period at each determination time point.

4. 3. The power supply system according to claim 1, wherein the power supply control unit executes charging control to charge the storage battery of the electric vehicle with an amount of energy up to the chargeable energy amount after the determination point in the contract period when the chargeable energy amount derived in the chargeable energy amount derivation control is a positive value, and to stop charging the storage battery of the electric vehicle after the determination point in the contract period when the chargeable energy amount derived in the chargeable energy amount derivation control is a value equal to or less than zero.

5. the power supply control unit executes a surplus chargeable energy derivation control to derive, as the surplus chargeable energy, a value derived by multiplying the derived chargeable energy by a surplus rate smaller than 1, or a value derived by subtracting a predetermined surplus amount from the derived chargeable energy; 5. The power supply system according to claim 4, wherein, in the charging control, if the surplus chargeable energy derived in the surplus chargeable energy derivation control is a positive value, an amount of energy up to the surplus chargeable energy is charged to the storage battery of the electric vehicle after the determination time point, and if the surplus chargeable energy derived in the surplus chargeable energy derivation control is a value equal to or less than zero, charging of the storage battery of the electric vehicle after the determination time point is stopped.

6. 1. A power supply method for controlling charging of a storage battery mounted on an electric vehicle in a facility having a charging terminal capable of charging the storage battery, comprising: the facility power consumption control system is configured to be able to specifically receive the amount of stored power supplied from the charging terminal in the facility to the storage battery of the electric vehicle and the facility power consumption amount obtained by subtracting the amount of stored power from the amount of received power during a predetermined contract period for which a predetermined contracted amount of received power at the facility is determined, a first received power amount prediction control that derives a first received power amount prediction value as a prediction value of the received power amount during the target contract period by machine learning using at least the received power amount during the contract period that is earlier than the target contract period as an index; a second received power amount prediction control that derives a second received power amount prediction value, which is a prediction value of the received power amount at the end of a target contract period, from an increase rate of the facility power consumption calculated from a change over time in the facility power consumption amount from the start of the target contract period to a predetermined judgment time point, and a total received power amount that is the sum of the stored power amount and the facility power consumption amount from the start of the target contract period to the judgment time point; a power supply method for executing chargeable energy derivation control, the method comprising: during a specified contract period, until the second received energy amount prediction value is derived, deriving a value obtained by subtracting the first received energy amount prediction value from the contracted received energy amount as the amount of chargeable energy that can be charged to the storage battery of the electric vehicle during the contract period in question; and after the second received energy amount prediction value is derived, deriving a value obtained by subtracting the second received energy amount prediction value from the contracted received energy amount as the amount of chargeable energy that can be charged to the storage battery of the electric vehicle during the contract period in question from the determination time point onwards.

Images