JP2013121279A - Charge control device, charge control method and charge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an operation cost by successively optimizing charging capacity used for charging an onboard storage battery of an electric vehicle.SOLUTION: A charge control device 10 which controls charging of an additional storage battery 30 used when charging an onboard storage battery 62 of an electric vehicle 60 stores an electricity bill on the basis of time in a predetermined time range, calculates charge frequency necessary from specified time to time at which the predetermined time range ends when the electricity bill of the specified time in the predetermined time range is not the lowest, calculates a charge stop capacity which is a capacity of stopping charging of the additional storage battery 30 and a charge start capacity which is a capacity of starting charging of the additional storage battery 30 on the basis of the calculated charge frequency and an average charge capacity per one charging, starts charging of the additional storage battery 30 when a capacity stored in the additional storage battery 30 is less than the charge start capacity and stops charging of the additional storage battery 30 when the capacity stored in the additional storage battery 30 reaches the charge stop capacity.

Description

  The present invention relates to a charge control device, a charge control method, and a charge system.

  For charging an in-vehicle storage battery of an electric vehicle, a quick charger capable of shortening the charging time may be used (see, for example, Patent Document 1 below). In order to improve the charging infrastructure for electric vehicles, it has been proposed to install quick chargers in facilities such as housing complexes, commercial facilities, and public facilities. In addition, a storage battery is provided in combination with the quick charger, and the on-vehicle storage battery of the electric vehicle is charged using the electric power charged in the storage battery.

JP 2009-77557 A

  If the electricity charge varies depending on the time of day, if the storage battery installed in the quick charger is always fully charged, it will charge more electricity than necessary at times of high electricity charge, and it will operate. Cost becomes high.

  The present invention has been made in view of the above problems, and its purpose is to sequentially optimize the charge amount of a storage battery used for charging an in-vehicle storage battery of an electric vehicle, thereby suppressing the operation cost, The object is to provide a charging control method and a charging system.

  In order to achieve the above object, a charge control device according to the present invention is a charge control device that controls charging of a storage battery used when charging an on-vehicle storage battery of an electric vehicle, and is for each time in a predetermined time range. Storage means for storing the electricity charge, and if the electricity charge for the time specified in the predetermined time range is not the cheapest, the number of charging required from the specified time to the time when the predetermined time range ends The charge number calculation means to calculate, the charge stop capacity that is the capacity to stop the charge of the storage battery based on the charge number calculated by the charge number calculation means and the average charge capacity per charge, and the storage battery A charging means that starts charging of the battery; a calculating means for calculating a charging start capacity; and charging of the storage battery when a capacity stored in the storage battery falls below the charging start capacity And charge control means for stopping charging of the storage battery when the capacity stored in the storage battery reaches the charge stop capacity.

  Moreover, in one aspect of the present invention, the charge control device stores, for each time in the predetermined time range, past performance values of the number of times of charging from the time until the predetermined time range ends. The storage device further includes a storage unit, and the charge number calculation unit calculates an average of past performance values from the specified time to a time when the predetermined time range ends as the required charge number. .

  Moreover, in one aspect of the present invention, the charge control device stores, for each time in the predetermined time range, past performance values of the number of times of charging from the time until the predetermined time range ends. The charge number calculation means further includes a storage means, and the charge count calculation means is based on data stored in the performance data storage means for a cumulative probability for each charge count that may occur from the specified time to a time when the predetermined time range ends. And the number of times of charging at which the calculated cumulative probability is a threshold is calculated as the required number of times of charging.

  Moreover, in one aspect of the present invention, the charge control device stores, for each time in the predetermined time range, past performance values of the number of times of charging from the time until the predetermined time range ends. The storage device further includes a storage unit, and the charge number calculation unit is based on an average of past actual values of the number of charges from the specified time to a time when the predetermined time range ends, and an electricity charge at the specified time. The required number of times of charging is calculated, and the calculated required number of times of charging is larger as the average of past actual values of the number of times of charging at the specified time becomes larger, and the electricity charge at the specified time is larger. It is calculated so that it may become so small that it is large.

  Moreover, in one aspect of the present invention, the charge control means charges the storage battery up to an upper limit that allows storage of the storage battery when the electricity rate for the time specified in the predetermined time range is the cheapest. It is characterized by.

  The charge control method according to the present invention is a charge control method for controlling charging of a storage battery used when charging a vehicle storage battery of an electric vehicle, and stores an electric charge for each hour in a predetermined time range. Charging that refers to the storage means and calculates the required number of charging times from the specified time to the time when the predetermined time range ends when the electricity rate for the specified time in the predetermined time range is not the cheapest Based on the number of times calculation step, the number of times of charging calculated in the number of times of charging calculation step, and the average charge capacity per charge, charging stop capacity that is a capacity for stopping charging of the storage battery and charging of the storage battery A calculation step of calculating a charge start capacity that is a capacity to be started, and when the capacity stored in the storage battery falls below the charge start capacity, charging of the storage battery is started. And, characterized in that it contains a charge control step of stopping the charging of the battery when the capacity is charged in the storage battery reaches the charge stop capacity.

  In addition, a charging system according to the present invention controls an in-vehicle storage battery of an electric vehicle using electricity supplied from a system power supply and electricity stored in the storage battery, and controls charging of the storage battery. A charge control device, wherein the charge control device stores the electricity charge for each hour in a predetermined time range, and when the electric charge for the time specified in the predetermined time range is not the lowest, Charge number calculation means for calculating the number of charge required from the specified time to the time when the predetermined time range ends, and the charge number calculated by the charge number calculation means and the average charge capacity per charge And calculating means for calculating a charge stop capacity that is a capacity for stopping charging of the storage battery and a charge start capacity that is a capacity for starting charging of the storage battery, and Charge control means for starting charging of the storage battery when the capacity stored in the storage battery falls below the charge start capacity and stopping charging of the storage battery when the capacity stored in the storage battery reaches the charge stop capacity It is characterized by including these.

  According to one aspect of the present invention, the amount of charge of a storage battery used for charging an in-vehicle storage battery of an electric vehicle is controlled based on the number of times of charging expected at the end of the time range at each time point in a predetermined time range. Thus, it is possible to sequentially optimize the charge amount of the storage battery and suppress the operation cost.

1 is a system configuration diagram of an electric vehicle charging system according to an embodiment. It is a functional block diagram of a charge control apparatus. It is a figure which shows an example of the electric power unit price data according to time zone. It is a figure which shows an example of charge log | history data. It is a functional block diagram of a storage battery control part. (A) is a figure which shows the average charging frequency for every time, (B) is a figure which shows the cumulative value of the average charging frequency until the end (24:00) of the time range for every time. It is a figure which shows the probability distribution showing the relationship between the frequency | count of charging k and its generation probability p (k). (A) is a figure which shows the relationship between the frequency | count k of charge in the object period, and its accumulation probability cP (k), (B) is a figure which shows an example of an interpolation curve. It is a figure which shows the relationship between (beta) and the average value (lambda) (t) of the electricity bill C (t) and the past charge frequency. It is a figure which shows an example of transition of the charge start capacity | capacitance (SOClower) and charge stop capacity | capacitance (SOCupper) set for every time in basic mode. It is a figure which shows an example of transition of the charge start capacity | capacitance (SOClower) and charge stop capacity | capacitance (SOCupper) set for every time in charge priority mode. It is a figure which shows an example of transition of the charge start capacity | capacitance (SOClower) and charge stop capacity | capacitance (SOCupper) set for every time in cost priority mode. It is a flowchart of a charge control process.

  Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  In FIG. 1, the system block diagram of the comprehensive charging system 1 which concerns on this embodiment was shown. As shown in FIG. 1, the total charging system 1 includes a charging system 5 and a side-by-side storage battery 30 provided alongside the charging system 5, and the charging system 5 includes a charging control device 10, a charging unit 20, and a charging unit 20. And the side-by-side storage battery 30 are connected, and the electric vehicle 60 is charged using the electric power supplied from the AC power supply 2. In the general charging system 1, the side battery 30 is charged while the electric vehicle 60 is not being charged, and the electricity charged in the side battery 30 is used for charging the electric vehicle 60. In addition, the charging unit 20, the bidirectional conversion unit 40, and the side-by-side storage battery 30 may each be one or plural.

  The charging control device 10 controls the output of each charging unit 20, monitors the remaining capacity (storage capacity: SOC (State Of Charge)) stored in the auxiliary storage battery 30, and controls the charging / discharging of the auxiliary storage battery 30, Communication. The configuration of the charging control device 10 and details of processing performed in the charging control device 10 will be described later.

  The charging unit 20 includes an AC / DC converter that converts an AC voltage (for example, AC 200V) into a predetermined DC voltage (for example, DC 50 to 500V) and outputs the converted voltage. The DC voltage (charging voltage) output from the charging unit 20 may be set to a specified voltage received from the connected electric vehicle 60, for example. When the electric vehicle 60 is not charged and the storage capacity (SOC) of the side-by-side storage battery 30 is less than the charging start capacity (SOClower), the charging unit 20 is directed toward the bidirectional conversion unit 40. Power is output to start charging of the side battery 30. When the storage capacity of the side battery 30 reaches the charge stop capacity (SOCupper), the output from the charging unit 20 is stopped and charging of the side battery 30 is finished. It is good to do.

  The side-by-side storage battery 30 is controlled to be charged based on the charge start capacity (SOClower) and the charge stop capacity (SOCupper) set by the charge control device 10, and the side-by-side storage battery 30 is charged when the electric vehicle 60 is charged. Electricity is supplied to the electric vehicle 60 through the bidirectional conversion unit 40. Here, the bidirectional conversion unit 40 converts the electric power input from the side-by-side storage battery 30 into a predetermined electric power and outputs it to the electric vehicle 60.

  The electric vehicle 60 includes an in-vehicle storage battery 62, a motor that drives using the electric power of the in-vehicle storage battery 62, wheels, a power transmission system that transmits the power of the motor to the wheels, various accessories, a control unit that controls each unit, and the like. The control unit of the electric vehicle 60 and the charging control device 10 may communicate at the time of charging, and the charging condition according to the state of the in-vehicle storage battery 62 of the electric vehicle 60 may be transmitted to the charging control device 10.

  In FIG. 2, the functional block diagram of the charging control apparatus 10 was shown. As shown in FIG. 2, the charging control device 10 includes a storage unit 100, a charging unit control unit 102, a storage battery control unit 104, an electric vehicle communication unit 106, and an electric vehicle charging control unit 108.

  The functions of the above-described units included in the charge control device 10 are information storage that can be read by a computer including control means such as a CPU, storage means such as a magnetic disk and memory, and communication means that communicates data with an external device. It may be realized by reading and executing a program stored in a medium. The program may be supplied to the charging control apparatus 10 as a computer by an information storage medium such as an optical disk, a magnetic disk, a magnetic tape, a magneto-optical disk, or a flash memory, or may be supplied via a data communication network such as the Internet. It may be done.

  The storage unit 100 stores data and programs and is also used as a work memory for the charging control device 10. Hereinafter, an example of data stored in the storage unit 100 will be described.

  FIG. 3 shows an example of power unit price data for each time zone stored in the storage unit 100. The electric power unit price data shown in FIG. 3 shows the electricity bill at each time point in the time range starting at 0:00 and ending at 24:00 24 hours after 0:00.

  FIG. 4 shows an example of charging history data stored in the storage unit 100. The charging history data is data in which a charging history of the electric vehicle 60 performed by the general charging system 1 is recorded. The charging history data shown in FIG. 4 stores charging date and time, day of the week, weekday / holiday / holiday type, and charging amount in association with each other.

  The storage unit 100 may store a charge flag indicating whether or not the electric vehicle 60 is connected to the charging unit 20 and charging is performed. For example, the charging flag may be a true / false value that is ON (true) when the electric vehicle 60 is charged, and OFF (false) otherwise.

  The charging unit control unit 102 controls the operation of each charging unit 20. For example, the charging unit control unit 102 controls on / off of each charging unit 20 and further sets a charging voltage and a charging current for the charging unit 20 that is turned on.

  The storage battery control unit 104 monitors the state of the side-by-side storage battery 30 attached to the charging unit 20 and controls the bidirectional conversion unit 40 to control charging / discharging of the side-by-side storage battery 30. For example, the storage battery control unit 104 sequentially acquires the storage capacity (SOC) of the side-by-side storage battery 30 and starts charging the side-by-side storage battery 30 when the storage capacity falls below the charge start capacity (SOClower). When the charge stop capacity (SOCupper) is reached, charging of the side battery 30 is stopped. Note that the storage battery control unit 104 refers to the value of the charging flag stored in the storage unit 100, and may control to charge the side-by-side storage battery 30 only when the electric vehicle 60 is not charged. .

  Further, the storage battery control unit 104 stops the discharge of the side storage battery 30 when the storage capacity (SOC) of the side storage battery 30 reaches a predetermined discharge prohibition capacity (SOCll) when the side storage battery 30 is discharged. If the storage capacity (SOC) of the side battery 30 reaches a predetermined charge inhibition capacity (SOCul) during charging of the side battery 30, charging of the side battery 30 is stopped. The relationship between the charge start capacity (SOClower), the charge stop capacity (SOCupper), the discharge prohibition capacity (SOCll), and the charge prohibition capacity (SOCul) is SOCll ≦ SOClower <SOCupper ≦ SOCul, and in this embodiment, the charge start capacity (SOClower) and charge stop capacity (SOCupper) are sequentially updated, and the charge state of the side-by-side storage battery 30 is controlled based on the charge start capacity (SOClower) and charge stop capacity (SOCupper) set at each time point. . Details of the setting process of the charge start capacity (SOClower) and the charge stop capacity (SOCupper) will be described later.

  The electric vehicle communication unit 106 communicates with the electric vehicle 60 connected to the charging unit 20 via a charging cable. For example, the electric vehicle communication unit 106 receives a charge request from the electric vehicle 60 and performs processing such as notifying the electric vehicle 60 of power that can be output.

  The electric vehicle charging control unit 108 controls charging of the in-vehicle storage battery 62 of the electric vehicle 60 connected to the charging unit 20 via the charging cable. For example, the electric vehicle charging control unit 108 sets the discharge voltage and discharge current from the charging unit 20 and the storage battery 30 on the basis of the charging condition received by the electric vehicle communication unit 106, so that the electric vehicle 60 is mounted on the vehicle. Charging of the storage battery 62 is started. At this time, the electric vehicle charging control unit 108 updates the charging flag stored in the storage unit 100 to ON, and the charging of the in-vehicle storage battery 62 of the electric vehicle 60 is completed (including normal termination or abnormal termination). Updates the charge flag to OFF.

  Next, details of functions provided in the storage battery control unit 104 will be described with reference to the drawings.

  FIG. 5 shows a functional block diagram of the storage battery control unit 104. As shown in FIG. 5, the storage battery control unit 104 includes a full charge determination unit 150, a charge mode selection unit 152, a required charge number calculation unit 154, a charge stop capacity calculation unit 156, a charge start capacity calculation unit 158, and a charge control unit. 160, a discharge control unit 162, and a data recording unit 164. Hereinafter, details of processing performed in each unit will be described.

  The full charge determination unit 150 determines whether or not the unit price of electric power at the charge determination timing is the minimum (lowest) when the charge determination timing of the side storage battery 30 arrives. 30 is determined to be charged to the charge prohibition capacity (SOCul), and if it is not the minimum, charge control corresponding to the charge mode described later is executed. The charging determination timing may be provided at predetermined time intervals, for example, or may be an arbitrary timing when the charging flag stored in the storage unit 100 is OFF, that is, the electric vehicle 60 is not charged. In addition, the full charge determination unit 150 may determine whether or not the power unit price at the charge determination timing is minimum with reference to the power unit price data stored in the storage unit 100.

  The charging mode selection unit 152 selects whether to perform charging control in any of the basic mode, the charging priority mode, and the cost priority mode. For example, the charging mode selection unit 152 may select a preset mode from among the basic mode, the charging priority mode, and the cost priority mode, or may select a mode set in association with a time zone, a day of the week, or the like. It is good also as selecting. Specifically, for example, the charging mode may be determined such as a basic mode for weekdays, a charging priority mode for Saturdays, and a cost priority mode for Sundays. The details of the charge control performed in each mode of the basic mode, the charge priority mode, and the cost priority mode will be described later.

  The required number-of-charges calculation unit 154 determines the predetermined time range from the charge determination timing (t) in a predetermined time range (for example, 0:00 to 24:00) according to the charging mode selected by the charging mode selection unit 152. A charge count (necessary charge count) estimated to be necessary until the end (for example, 24:00) (hereinafter referred to as a target period) is calculated. Hereinafter, the calculation processing of the required number of times of charging when the charging mode is the basic mode, the charging priority mode, and the cost priority mode will be described in order.

[Basic mode]
First, calculation processing of the required number of times of charging (Nch (t)) when the charging mode is the basic mode will be described.

  When the charging mode is the basic mode, the required charging frequency calculation unit 154 may calculate the average value λ (t) of the past charging frequency in the target period as the required charging frequency (Nch (t)). .

  FIG. 6 shows the average number of times of charging (A) for each time and the cumulative value (B) of the average number of times of charging until the end of the time range for each time (24:00). Here, the average value λ (t) of the past charging times in the target period corresponds to the cumulative value of the average charging times at each time (t) in FIG. 6 may be calculated based on the charging history data stored in the storage unit 100, or may be given in advance. Moreover, the average value λ (t) of the past charging times may be calculated for each day of the week, weekday, and holiday, and λ (t) according to the type of the day of the charging determination timing t, weekday, and holiday. And the required number of charging times Nch (t) may be determined using the specified λ (t).

  Thus, when the basic mode is adopted as the charging mode, the number of times of charging estimated to be necessary in the target period can be set based on the average number of times of charging performed in the past in the same period.

[Charging priority mode]
Next, a calculation process of the required number of charging times (Nch (t)) when the charging mode is the charging priority mode will be described.

  When the charge mode is the charge priority mode, the required charge number calculation unit 154 obtains the relationship between the charge number and its occurrence probability in the target period, and determines the charge number that the accumulated probability becomes a predetermined value as the required charge number (Nch (T)) may be calculated.

  FIG. 7 shows a probability distribution representing the relationship between the number of times of charging k and its occurrence probability p (k) in the target period starting from the charging determination timing t. The probability distribution may be a Poisson distribution generated based on the average value of the number of times of charging at each time shown in FIG. 7, or may be generated based on another distribution function.

FIG. 8A shows the relationship between the number of times of charging k in the target period and the cumulative probability cP (k). The cumulative probability cP (k) is calculated by the following equation (1).

  As shown in FIG. 8 (B), in the relationship between the cumulative probability and the number of times of charging, interpolation between two points of the number of times of charging n and the cumulative probability thereof and the number of times of charging n + 1 and the cumulative probability is performed by a straight line or a curve. The number of times of charging corresponding to an arbitrary cumulative probability may be determined. The interpolation method used at this time is not particularly limited.

  The required charge number calculation unit 154 specifies the charge number q at which the cumulative probability is a predetermined value Q, and obtains the specified charge number q as the required charge number (Nch (t)). However, when the cumulative probability cP (0) of the number of times of charging exceeds the predetermined value Q, or when the number of times of charging when the cumulative probability is Q is below the average value λ (t), Nch (t) = It may be λ (t).

  Thus, when the charge priority mode is adopted as the charge mode, the probability that the charge amount will be insufficient in the future at the charge determination timing can be suppressed to 1-Q.

[Cost priority mode]
Finally, calculation processing of the required number of times of charging (Nch (t)) when the charging mode is the cost priority mode will be described.

When the charge mode is the cost priority mode, the required charge number calculation unit 154 sets the required charge number Nch (t) to the discharge inhibition capacity (SOCll), the charge inhibition capacity (SOCul), and the average charge per time. Using the quantity (SOCave) and the coefficient β (0 ≦ β ≦ 1), the calculation is performed by the following equation (2). Here, β may be a function having as parameters the electricity rate C (t) at the time t and the average value λ (t) of the past charging times.
Nch (t) = β (SOCul−SOCll) / SOCave (2)

FIG. 9 shows the relationship between the electricity rate C (t) and the average value λ (t) of past charging times and β. As shown in FIG. 9, β is represented by a curve (or straight line) that is 1 when C (t) is the minimum value (Cmin), and 0 when it is the maximum value (Cmax). Is calculated so that the value of β increases for the same electricity rate C (t) as λ (t) increases. For example, β may be calculated by the following equation (3). Here, a may be a function of λ (t).
β = a · C (t) ² + b · C (t) + c (3)

  As described above, when the cost priority mode is adopted as the charging mode, the required number of times of charging calculated as the electric charge at the charging determination timing is lower can be increased.

The charge stop capacity calculation unit 156 calculates a charge stop capacity (SOCupper) based on the required charge number Nch (t) calculated by the required charge number calculation unit 154. For example, the charge stop capacity calculation unit 156 may calculate the charge stop capacity (SOCupper) by the following equation (4).
SOCupper = Nch (t) ・ SOCave + SOCll (4)
Here, when the charge stop capacity (SOCupper) calculated by the equation (4) exceeds the charge prohibition capacity (SOCul), SOCupper = SOCul. Further, SOCupper = SOCul is also set when it is determined by the full charge determination unit 150 that full charge is to be performed.

The charge start capacity calculator 158 calculates a charge start capacity (SOClower) based on the charge stop capacity calculated by the charge stop capacity calculator 156. For example, the charging start capacity calculation unit 158 may calculate the charging start capacity (SOClower) by the following equation (5).
SOClower = SOCupper-α · SOCave (5)
Here, α is a coefficient of 0 or more, and may be a constant, or may be a variable having time, λ (t), and electricity rate C (t) as parameters. In addition, when the charge start capacity (SOClower) calculated by the equation (5) is lower than the discharge prohibition capacity (SOCll), SOClower = SOCll. The calculation of the SOClower is not limited to the above-described example, and the SOClower may be calculated so as to be a charge capacity corresponding to the number of times of charge at which the cumulative probability becomes a predetermined value Qlower (<Q).

  Here, FIG. 10A shows an example of transition of the charge start capacity (SOClower) and the charge stop capacity (SOCupper) set for each time when the charge mode is the basic mode. In FIG. 10A, (1) corresponds to an electricity bill, (2) corresponds to SOCupper, and (3) corresponds to SOClower. As shown in FIG. 10A, the charge start capacity (SOClower) and the charge stop capacity (SOCupper) are a discharge prohibition capacity (SOCll, 20% of the maximum storage capacity) and a charge prohibition capacity (SOCul, 80% of the maximum storage capacity). )). As the time elapses, both the charge start capacity (SOClower) and the charge stop capacity (SOCupper) become smaller, but when the electricity bill is minimized, the battery is controlled to be fully charged.

  FIG. 10B shows an example of changes in the charge start capacity (SOClower) and the charge stop capacity (SOCupper) set for each time when the charge mode is the charge priority mode. In FIG. 10B, (1) corresponds to an electricity bill, (2) corresponds to SOCupper, and (3) corresponds to SOClower. As shown in FIG. 10B, the charge start capacity (SOClower) and the charge stop capacity (SOCupper) are set between the discharge inhibition capacity (SOCll) and the charge inhibition capacity (SOCul). Even in the charge priority mode, the charge start capacity (SOClower) and the charge stop capacity (SOCupper) both become smaller with the passage of time, and when the electricity bill is minimized, it is controlled to fully charge. This is the same as in the basic mode, but the period during which the charge stop capacity (SOCupper) matches the charge prohibition capacity (SOCul) is longer than in the basic mode.

  FIG. 10C shows an example of changes in the charge start capacity (SOClower) and the charge stop capacity (SOCupper) set for each time when the charge mode is the cost priority mode. In FIG. 10C, (1) corresponds to the electricity bill, (2) corresponds to SOCupper, and (3) corresponds to SOClower. As shown in FIG. 10C, the charge start capacity (SOClower) and the charge stop capacity (SOCupper) are set between the discharge inhibition capacity (SOCll) and the charge inhibition capacity (SOCul). In the cost priority mode, the charge start capacity (SOClower) and the charge stop capacity (SOCupper) are both smaller in the time zone when the electricity charge is not minimum compared to the other modes, and the electricity charge is maximized. The case differs from the other modes in that it is controlled not to charge.

  The charge control unit 160 controls charging of the side-by-side storage battery 30 based on the charge start capacity (SOClower) calculated by the charge start capacity calculation unit 158 and the charge stop capacity (SOCupper) calculated by the charge stop capacity calculation unit 156. To do. Specifically, when the electric vehicle 60 is not charged, the charging control unit 160 starts charging the side-by-side storage battery 30 when the storage capacity falls below the charging start capacity (SOClower), and the storage capacity is charged. When the stop capacity (SOCupper) is reached, charging of the side battery 30 is stopped.

  The discharge control unit 162 starts discharging the electricity stored in the side storage battery 30 in accordance with an instruction from the electric vehicle charging control unit 108. Moreover, the discharge control part 162 stops discharge, when the electrical storage capacity (SOC) of the side battery 30 reaches the discharge prohibition capacity (SOCll).

  When the electric vehicle 60 is charged, the data recording unit 164 stores history information regarding the charging in the storage unit 100. For example, the data recording unit 164 may record the charging date and time, day of the week, weekday / holiday / holiday type, and charging amount in addition to the charging history data stored in the storage unit 100.

  Next, the flow of the charging control process performed by the charging control apparatus 10 according to the present embodiment will be described with reference to the flowchart shown in FIG.

  As shown in FIG. 11, the charging control device 10 determines whether or not the update timing of the charge start capacity (SOClower) and the charge stop capacity (SOCupper) has arrived (S1001). (S1001: N), it waits and when it arrives (S1001: Y), it is determined whether the electricity bill at the update timing is the cheapest in a day (S1002).

  When determining that the electricity bill at the update timing is the cheapest in S1002 (S1002: Y), the charge control device 10 sets the charge stop capacity (SOCupper) to the charge prohibition capacity (SOCul) (S1003). . In S1002, the charging control device 10 determines the selected charging mode (S1004) when determining that the electricity rate at the update timing is not the lowest (S1002: N), and according to the charging mode. Set the charge stop capacity (SOCupper).

  First, when the charging mode is the “basic mode” (S1004: 1), the charging control device 10 calculates the required number of charging times according to the “basic mode” (S1005), and the charging mode is “charging priority mode”. ”(S1004: 2), the required number of times of charging corresponding to the“ charging priority mode ”is calculated (S1006). When the charging mode is“ cost priority mode ”(S1004: 3),“ The required number of charging times corresponding to the “cost priority mode” is calculated (S1007).

  Next, the charge control device 10 calculates and sets a charge stop capacity according to, for example, the above-described equation (4) based on the calculated required number of charges (S1008). The charge control device 10 calculates and sets the charge start capacity according to, for example, the above-described equation (5) based on the set charge stop capacity (S1009).

  When the storage capacity (SOC) of the side-by-side storage battery 30 is less than the set charge start capacity (SOClower) (S1010: Y), the charge control device 10 starts charging the side-by-side storage battery 30 (S1011). . When the charging control apparatus 10 does not charge the electric vehicle (EV) (S1012: N), the storage capacity (SOC) of the side-by-side storage battery 30 reaches the set charging stop capacity (SOCupper). (S1013: N) until charging is continued. On the other hand, the charging control device 10 charges the electric vehicle (EV) (S1012: Y), or when the storage capacity (SOC) of the side-by-side storage battery 30 reaches the set charging stop capacity. (S1013: N), charging is stopped (S1014).

  Further, the charge control device 10 is a case where the storage capacity (SOC) of the side-by-side storage battery 30 is equal to or greater than the set charge start capacity in S1010 (S1010: N) and does not end the charge control (S1015: N), returning to S1001, and when charging control is terminated (S1015: Y), the processing is terminated.

  According to the overall charging system 1 according to the present embodiment described above, the amount of charge of the side battery 30 that is attached to the charger of the electric vehicle 60 and used for charging the electric vehicle 60 can be estimated in the future from each time point. By sequentially updating the battery so that it can be charged the number of times, it is not necessary to always charge the side-by-side storage battery 30 to the maximum in a time zone when the electricity rate is high, so that the operation cost can be reduced.

  Of course, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the charging mode may be switched according to the time zone even during a predetermined period.

  DESCRIPTION OF SYMBOLS 1 Comprehensive charging system, 2 AC power supply, 5 Charging system, 10 Charging control apparatus, 20 Charging unit, 30 Side-by-side storage battery, 40 Bidirectional conversion unit, 60 Electric vehicle, 62 Car storage battery, 100 Storage unit, 102 Charging unit control unit , 104 storage battery control unit, 106 electric vehicle communication unit, 108 electric vehicle charge control unit, 150 full charge determination unit, 152 charge mode selection unit, 154 required charge number calculation unit, 156 charge stop capacity calculation unit, 158 charge start capacity Calculation unit, 160 charge control unit, 162 discharge control unit, 164 data recording unit.

Claims (7)

A charge control device that controls charging of a storage battery used when charging a storage battery for in-vehicle use of an electric vehicle,
Storage means for storing an electricity bill for each hour in a predetermined time range;
A charge number calculating means for calculating a required number of charges from the specified time to the time when the predetermined time range ends when the electricity rate for the time specified in the predetermined time range is not the lowest;
Based on the number of times of charging calculated by the number-of-charges calculating means and the average charging capacity per charge, a charge stopping capacity that is a capacity for stopping charging of the storage battery and a capacity for starting charging of the storage battery. A calculation means for calculating a charge start capacity;
Charging that starts charging the storage battery when the capacity stored in the storage battery falls below the charge start capacity, and stops charging the storage battery when the capacity stored in the storage battery reaches the charge stop capacity And a control means. For each time in the predetermined time range, further includes performance data storage means for storing a past performance value of the number of times of charging until the predetermined time range ends from the time,
The said charge frequency calculation means calculates the average of the past track record value from the specified time to the time when the predetermined time range ends as the required charge frequency. Charge control device. For each time in the predetermined time range, further includes performance data storage means for storing a past performance value of the number of times of charging until the predetermined time range ends from the time,
The charge number calculation means calculates a cumulative probability for each charge number that can occur from the specified time to a time when the predetermined time range ends based on data stored in the performance data storage means, and The charge control device according to claim 1, wherein the number of times of charging at which the calculated cumulative probability becomes a threshold is calculated as the required number of times of charging. For each time in the predetermined time range, further includes performance data storage means for storing a past performance value of the number of times of charging until the predetermined time range ends from the time,
The charging number calculating means is configured to calculate the necessary charging based on an average of past actual values of the number of charging times from the specified time to a time at which the predetermined time range ends, and an electricity charge at the specified time. Calculate the number of times,
The calculated required number of times of charging is calculated so that the average of the past actual values of the number of times of charging at the specified time increases, and the calculated electric charge at the specified time decreases. The charge control device according to claim 1, wherein The charge control means charges the storage battery up to an upper limit of storage capacity of the storage battery when the electricity charge for the specified time in the predetermined time range is the cheapest. The charge control apparatus in any one of. A charge control method for controlling the charging of a storage battery used when charging an in-vehicle storage battery of an electric vehicle,
With reference to the storage means for storing the electricity charges for each hour in the predetermined time range, when the electricity charges for the time specified in the predetermined time range are not the lowest, the predetermined time range is determined from the specified time. A charge count calculation step for calculating the number of charge required by the time to end,
Based on the number of times of charging calculated in the step of calculating the number of times of charging and the average charge capacity per charge, a charge stopping capacity that is a capacity for stopping charging of the storage battery and a capacity for starting charging of the storage battery. A calculation step for calculating a charge start capacity;
Charging that starts charging the storage battery when the capacity stored in the storage battery falls below the charge start capacity, and stops charging the storage battery when the capacity stored in the storage battery reaches the charge stop capacity A charge control method comprising: a control step. A charging device for charging an in-vehicle storage battery of an electric vehicle using electricity supplied from a system power supply and electricity stored in the storage battery;
A charge control device for controlling charging of the storage battery,
The charge control device includes:
Storage means for storing an electricity bill for each hour in a predetermined time range;
A charge number calculating means for calculating a required number of charges from the specified time to the time when the predetermined time range ends when the electricity rate for the time specified in the predetermined time range is not the lowest;
Based on the number of times of charging calculated by the number-of-charges calculating means and the average charging capacity per charge, a charge stopping capacity that is a capacity for stopping charging of the storage battery and a capacity for starting charging of the storage battery. A calculation means for calculating a charge start capacity;
Charging that starts charging the storage battery when the capacity stored in the storage battery falls below the charge start capacity, and stops charging the storage battery when the capacity stored in the storage battery reaches the charge stop capacity And a control means.

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