JP2013085440A - Vehicle charging system and vehicle charging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle charging system capable of simultaneously charging plural vehicles efficiently by using plural power supply sections.SOLUTION: A vehicle charging system sets priorities of charging stands X, Y and Z. The priority shows that the higher the priority of the charging stand, the larger electric energy to be supplied from the charging stand. To determine the electric energy supplied from respective charging stands X, Y and Z, a setting section 16 determines the electric energy so that a sum total of the electric energy supplied from respective charging stands X, Y and Z is at or less than a preset peak electric energy PP1 and the electric energy supplied from respective charging stands X, Y and Z are at or more than a preset minimum electric energy Pmin.

Description

  The present invention relates to a vehicle charging system and a vehicle charging method for charging a storage battery mounted on a vehicle.

  As a vehicle charging system for charging a storage battery mounted on a vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle), for example, a charging device of Patent Document 1 is known. The charging device disclosed in Patent Document 1 connects a plurality of vehicles to one charging device and charges a plurality of vehicles at the same time.

JP 2011-130593 A

  In the charging device of Patent Document 1, when a plurality of vehicles are charged at the same time, the amount of power distributed to each vehicle is determined according to the priority order of charging. For this reason, for vehicles with a low priority, there is a possibility that the amount of power distributed becomes extremely small and the charging efficiency is lowered.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to efficiently carry out charging of a plurality of vehicles simultaneously using a plurality of power supply units. It is providing the vehicle charge system which can charge, and a vehicle charge method.

  In order to solve the above problems, the invention according to claim 1 is a vehicle charging system for charging a storage battery mounted on a vehicle, supplying electric power for charging to the vehicle, and A plurality of power supply units, a priority setting unit that sets a priority order that defines the amount of power supplied from each power supply unit, and power that determines the amount of power supplied by each power supply unit according to the priority order An amount determining unit, wherein the amount of power supplied by each power supply unit is less than or equal to a preset maximum supply power amount, and the amount of power supplied by each power supply unit is preset. The gist is to determine the power amount of each power supply unit so as to be equal to or greater than the set minimum power amount.

  According to this, even when the vehicle is charged by a plurality of power supply units, the amount of power supplied by each power supply unit is determined to be equal to or greater than the preset minimum power amount. That is, even if the vehicle is connected to a power supply unit with a low priority, the amount of power supplied to the vehicle is extremely small because charging is performed by supplying power corresponding to the minimum amount of power. Absent. Therefore, even when a plurality of vehicles are charged simultaneously using a plurality of power supply units, charging can be performed efficiently.

  According to a second aspect of the present invention, in the vehicle charging system according to the first aspect, the power amount determination unit further prevents the power amount supplied by each power supply unit from exceeding a preset maximum power amount. The main point is to determine the power amount of each power supply unit.

  According to this, even when the vehicle is charged by a plurality of power supply units, the amount of power supplied by each power supply unit is determined so as not to exceed a preset maximum power amount. For this reason, the amount of power supplied to a vehicle connected to a power supply unit having a high priority is not extremely increased, and power is reliably supplied to vehicles connected to other power supply units. Can be distributed. Therefore, it can charge efficiently.

  The invention according to claim 3 is the vehicle charging system according to claim 2, wherein the power amount determination unit determines the power amount in order from the power supply unit having the lowest priority.

  According to this, since the amount of power supplied from the power supply unit with the lower priority is determined, the minimum amount of power can be reliably ensured as the amount of power supplied by the power supply unit. That is, the power amount of each power supply unit can be determined efficiently.

  According to a fourth aspect of the present invention, in the vehicle charging system according to the third aspect, when the power amount determination unit sets the power amount of the power supply unit with the highest priority as the maximum power amount, the entire system When a surplus occurs in the amount of power that can be used for charging, the gist is to determine the power amount of another power supply unit again.

  According to this, since the surplus power is redistributed to the other power supply units, it is possible to increase the power amount of the other power supply units having a low priority. Therefore, it can charge efficiently.

  Invention of Claim 5 is a vehicle charging system as described in any one of Claims 1-4. The electric power measurement part which measures the electric energy which each electric power supply part supplied to the said vehicle, A battery capacity discriminating unit that discriminates a battery capacity of a storage battery mounted on a vehicle, and the priority setting unit is based on the measurement result of the power measuring unit and the discrimination result of the battery capacity discriminating unit. The gist is to set the priority order from a ratio of a charge amount of the storage battery charged with power supplied from the power supply unit to a battery capacity.

  According to this, the priority is set from the ratio of the charge amount to the battery capacity. For this reason, the amount of electric power to be supplied increases as the amount of charge required to reach a fully charged state increases. For example, when the priority order is set based only on the current charge amount, the priority order is the same if the charge amount of each vehicle is the same. That is, in this case, a vehicle with a high charge ratio and a low vehicle with respect to the battery capacity are charged with the same priority. However, according to the present invention, a plurality of vehicles are simultaneously charged using a plurality of power supply units by increasing the priority of a vehicle having a low charge amount to battery capacity and charging. However, it can charge efficiently.

  According to a sixth aspect of the present invention, in the vehicle charging system according to the fifth aspect of the present invention, a vehicle type discriminating unit that discriminates a vehicle type is provided, and the battery capacity discriminating unit is a battery based on the vehicle type discriminated by the vehicle type discriminating unit. The gist is to determine the capacity. According to this, since the vehicle type discrimination is performed to obtain information necessary for setting the priority order, the priority order can be accurately set even when the battery capacity differs for each vehicle.

  The invention according to claim 7 is a vehicle charging method for charging a storage battery of the vehicle using a vehicle charging system having a plurality of power supply units that supply charging power to the vehicle, wherein each power supply unit A priority order that prescribes the magnitude of the amount of power supplied from the power supply unit, determines the amount of power supplied by each power supply unit according to the priority order, performs charging with the determined power amount, and each power supply unit When determining the amount of power supplied by each power supply unit, the total amount of power supplied by each power supply unit is equal to or less than a preset maximum supply power amount, and the minimum amount of power supplied by each power supply unit is preset. The gist is to determine the amount of power to be greater than or equal to the amount of power.

  According to this, even when the vehicle is charged by a plurality of power supply units, the amount of power supplied by each power supply unit is determined to be equal to or greater than the preset minimum power amount. That is, even if the vehicle is connected to a power supply unit with a low priority, the amount of power supplied to the vehicle is extremely small because charging is performed by supplying power corresponding to the minimum amount of power. Absent. Therefore, even when a plurality of vehicles are charged simultaneously using a plurality of power supply units, charging can be performed efficiently.

  According to the present invention, when a plurality of vehicles are charged at the same time using a plurality of power supply units, the charging can be performed efficiently.

The block diagram which shows the structure of the vehicle charging system in 1st Embodiment. Explanatory drawing explaining the outline | summary of the electric energy which each charging stand supplies. The flowchart explaining operation | movement of a vehicle charging system. (A) is explanatory drawing explaining the specific example of the initial setting value for determining the electric energy which each electric power supply part supplies, (b), (c) is the electric energy which each electric power supply part supplies. Explanatory drawing explaining a calculation example. The block diagram which shows the structure of the vehicle charging system in 2nd Embodiment. Explanatory drawing explaining the maximum charging current value and battery capacity by vehicle type. The flowchart which shows the process which calculates a priority coefficient. The schematic diagram which shows the specific example in the case of calculating a priority coefficient. Explanatory drawing explaining the example of calculation of a priority coefficient. Explanatory drawing explaining another example.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle charging system K is connected to the power receiving facility 10 that receives power transmitted from the power system and the power receiving facility 10, and is connected to the vehicle via a charging cable when the vehicle is charged. A plurality of charging stations X, Y, Z. The charging stations X, Y, and Z serve as a power supply unit that supplies the power supplied from the power receiving facility 10 to the vehicle to be charged as charging power. Note that the vehicle charging system K of the present embodiment includes three charging stations X, Y, and Z, and can simultaneously charge three vehicles A, B, and C. One vehicle is connected to one charging station X, Y, Z. Further, the charging stations X, Y, and Z have the same configuration, and the detailed configuration is illustrated only by the charging station X in FIG. In addition, a load facility other than the charging stations X, Y, and Z to which power is supplied from the power receiving facility 10 is also connected to the power receiving facility 10. The load facility is a lighting fixture or the like that is disposed at a place where the vehicle charging system K is installed.

  In each charging station X, Y, Z, a power cut-off unit 11 that cuts off the flow of current when an overcurrent flows, a power control unit 12 that instructs a charging current command value when receiving power to the vehicle, Is provided. A vehicle A such as EV or PHV is equipped with a storage battery 13 that stores power supplied to an electric motor (motor) (not shown) that serves as a prime mover of the vehicle, and a charging control unit 14 that controls charging of the storage battery 13. Yes. The power control unit 12 of each charging station X, Y, Z instructs a charging current command value to the charging control unit 14 of the vehicle. On the other hand, the charging control unit 14 that has input the charging current command value executes charging control according to the charging current command value. As with the vehicle A, the storage battery 13 and the charge control unit 14 are mounted on the vehicles B and C shown in FIG.

  The vehicle charging system K includes a power measuring unit 15 that measures the amount of power used by the entire system, and charging stations X, Y, and Y based on the measurement results of the power measuring unit 15 and various setting values by the installer. A setting unit 16 that determines a charging current command value for instructing Z is connected. The setting unit 16 is connected to the power control unit 12 of each charging station X, Y, Z, and instructs the determined charging current command value to the power control unit 12 of each charging station X, Y, Z.

  The setting unit 16 can set the peak power amount PP1, the control unit time Tx, the number of stands N, the minimum power amount Pmin, and the maximum power amount Pmax by an input operation of the installer. The peak power amount PP1 is the maximum power supply amount that is the sum of the power amounts supplied by the charging stations X, Y, and Z. The control unit time Tx is a time for determining the charging current command value that the setting unit 16 instructs each charging station X, Y, Z, that is, a time for instructing the charging current command value. The number N of stations is the number of charging stations connected to the power receiving facility 10. The minimum power amount Pmin is the minimum value of the power amount supplied by each charging station X, Y, Z when charging. The maximum power amount Pmax is a maximum value of the power amount supplied by each charging station X, Y, Z when charging.

  When charging is performed, the setting unit 16 of the present embodiment determines a charging current command value to be instructed to each charging station X, Y, Z so as to satisfy the following three conditions described below. The first condition is that the total amount of power supplied by each charging station X, Y, Z does not exceed the peak power amount PP1 (maximum supplied power amount). The second condition is that the amount of power supplied by each charging station X, Y, Z is equal to or greater than the minimum amount of power Pmin. The third condition is that the amount of power supplied by each charging station X, Y, Z does not exceed the maximum amount of power Pmax.

FIG. 2 illustrates an image of the amount of power supplied by the charging stations X, Y, and Z when the three vehicles A, B, and C are charged by the vehicle charging system K of the present embodiment.
In the example illustrated in FIG. 2, the total power amount (integrated power amount) supplied by each charging station X, Y, Z is the peak power amount PP1. The amount of power supplied by the charging stand X is the minimum amount of power Pmin, while the amount of power supplied by the charging stand Z is the maximum amount of power Pmax. Note that the amount of power supplied by the charging stand Y is a value larger than the minimum power amount Pmin and smaller than the maximum power amount Pmax. Specifically, the amount of power supplied from the charging station Y is the amount of power obtained by subtracting the sum of the minimum power amount Pmin and the maximum power amount Pmax from the peak power amount PP1. Thus, in the vehicle charging system K of the present embodiment, the power amount of each charging station X, Y, Z is determined so as to be equal to or greater than the minimum power amount Pmin.

  Hereinafter, a method in which the setting unit 16 determines the electric energy of each charging station X, Y, Z will be described with reference to FIG. In the following description, it is assumed that the installer has set the peak power amount PP1, the control unit time Tx, the number of stands N, the minimum power amount Pmin, and the maximum power amount Pmax in the setting unit 16. In the following description, the charging stations X, Y, and Z are charged at the same time. Moreover, in this embodiment, the setting part 16 functions as a priority setting part and an electric energy determination part by performing the process demonstrated below.

  First, the setting unit 16 determines a priority order that defines the amount of power of each charging station X, Y, X, and sets a priority coefficient corresponding to the priority order (step S11). The priority coefficient is set to a higher value as the charging station has a higher priority. In the vehicle charging system K of the present embodiment, a charging station having a higher priority coefficient has a higher priority and a larger amount of power to be supplied. The priority coefficient is reset every control unit time Tx set in the setting unit 16. Therefore, for example, even when the highest priority coefficient is set for the charging station X in the current control unit, the charging station where the highest priority coefficient is set is changed in the next control unit. Sometimes it is maintained. The priority order is determined based on a predetermined rule. For example, the priority may be determined higher in ascending order depending on the amount of charge of each vehicle to be charged when the control unit time has arrived.

  The setting unit 16 that has set the priority coefficient in step S11 next calculates the set power value P1 of the charging station with the lowest priority and the lowest priority (step S12). This set power value P1 corresponds to the amount of power of the charging station with low priority. The setting unit 16 calculates the ratio of the priority coefficient set to the charging station with a low priority from the sum of the priority coefficients of the charging stations, and the amount of power (maximum: The set power value P1 is calculated by multiplying the peak power amount PP1). The amount of power that can be used for charging is determined based on the measurement result of the power measurement unit 15. And when the electric power of peak electric energy PP1 can be used, the setting part 16 determines the electric energy of each charging stand X, Y, and Z by making electric energy which can be used for charge into peak electric energy PP1.

  Next, the setting unit 16 compares the set power value P1 calculated in step S12 with the minimum power amount Pmin, and determines whether or not the set power value P1 is less than the minimum power amount Pmin (step S13). The process in step S13 is performed to determine whether or not the second condition described above is satisfied, that is, to prevent the power amount of each charging station X, Y, and Z from becoming less than the minimum power amount Pmin. If the determination result in step S13 is affirmative (set power value P1 <minimum power amount Pmin), the setting unit 16 changes the minimum power amount Pmin to the set power value P1 (step S14). On the other hand, when the determination result of step S13 is negative (set power value P1 ≧ minimum power amount Pmin), the setting unit 16 sets the calculated value of step S12 as the set power value P1 (step S15).

  The setting unit 16 that has determined the set power value P1 in step S14 or step S15 calculates the set power value P2 of the charging station having the priority higher than the low priority by the processing from step S16. The set power value P2 corresponds to the power amount of the charging station having the priority.

  In calculating the set power value P2, the setting unit 16 first subtracts the power amount for the set power value P1 from the power amount that can be used for charging in the entire system used in step S12. PP2 is calculated (step S16). Next, the setting unit 16 calculates the set power value P2 of the charging station having the priority (Step S17). Since the setting unit 16 has previously determined the power amount of the charging station with the low priority, the setting unit 16 is set to the charging station with the medium priority from the sum of the priority coefficients of the medium and high priority charging stations. The ratio of the priority coefficient is calculated, and the set power value P2 is calculated by multiplying the calculated value by the available power amount PP2.

  Next, the setting unit 16 compares the set power value P2 calculated in step S17 with the minimum power amount Pmin, and determines whether or not the set power value P2 is less than the minimum power amount Pmin (step S18). The process of step S18 is similar to the process of step S13, whether or not the above-mentioned second condition is met, that is, the electric energy of each charging station X, Y, Z is not less than the minimum electric energy Pmin. To do. If the determination result of step S18 is affirmative (set power value P2 <minimum power amount Pmin), the setting unit 16 changes the minimum power amount Pmin to the set power value P2 (step S19). On the other hand, when the determination result of step S18 is negative (set power value P2 ≧ minimum power amount Pmin), the setting unit 16 sets the calculated value of step S18 as the set power value P2 (step S20).

  The setting unit 16 that has determined the set power value P2 in step S19 or step S20 calculates the set power value P3 of the charging station with the highest priority and the highest priority through the processing from step S21. The set power value P3 corresponds to the power amount of the charging station with high priority.

  The setting unit 16 calculates the set power value P3 of the charging station with high priority (step S21). Since the setting unit 16 has previously determined the power amount of the charging station with low priority and medium priority, the set power value is determined from the power amount (maximum: peak power amount PP1) that can be used for charging in the entire system. The set power value P3 is calculated by subtracting the amount of power corresponding to the sum of P1 and the set power value P2.

  Next, the setting unit 16 compares the set power value P3 calculated in step S21 with the maximum power amount Pmax, and determines whether or not the set power value P3 exceeds the maximum power amount Pmax (step S22). . The process in step S22 is performed to determine whether or not the third condition described above is satisfied, that is, to prevent the power amount of each charging station X, Y, and Z from exceeding the maximum power amount Pmax. If the determination result in step S22 is affirmative (set power value P3> maximum power amount Pmax), the setting unit 16 changes the maximum power amount Pmax to the set power value P3 (step S23). On the other hand, when the determination result of step S22 is negative (set power value P3 ≦ maximum power amount Pmax), the setting unit 16 sets the calculated value of step S21 as the set power value P3 (step S24).

  Next, the setting unit 16 determines whether or not the set power value P3 has been changed to the maximum power amount Pmax (step S25). When the set power value P3 is changed to the maximum power amount Pmax, the power amount corresponding to the sum of the set power values P1 to P3 is subtracted from the power amount (maximum: peak power amount PP1) that can be used for charging in the entire system. Surplus power will be generated. For this reason, step S25 is performed in order to distribute the surplus power to other charging stations excluding the high priority. And the setting part 16 recalculates setting electric power value P1, P2, when the determination result of step S25 is affirmation (step S26). On the other hand, if the determination result of step S25 is negative, the total amount of power of each charging station X, Y, Z is the amount of power that can be used for charging in the entire system. Therefore, the setting unit 16 determines the set power values P1 to P3 calculated in the process up to step S24 as the amount of power supplied by each charging station X, Y, Z in the control unit time.

  On the other hand, in step S26, the setting unit 16 sets the remaining power amount obtained by subtracting the set power value P3 from the power amount that can be used for charging in the entire system as the priority set in the charging stations with low priority and medium priority in step S11. Distribute according to the coefficient. Specifically, the setting unit 16 first calculates the ratio of the priority coefficient set for the charging station with the low priority from the sum of the priority coefficients of the charging stations with the low priority and the medium priority. The set power value P1 is recalculated by multiplying the calculated value and the remaining power amount. Next, the setting unit 16 recalculates the set power value P2 by subtracting the recalculated set power value P1 from the remaining power amount. Then, the setting unit 16 determines the set power values P1, P2 and the set power value P3 recalculated in step S26 as the amount of power supplied by each charging station X, Y, Z in the control unit time. At this time, the set power values P1 and P2 are calculated so as to satisfy the second condition and the third condition described above.

  Then, in the vehicle charging system K, charging is performed by supplying electric power corresponding to the set power values P1 to P3 from the charging stations X, Y, and Z to each vehicle (step S27). The charging in step S27 is continuously performed during the control unit time Tx. That is, when the control unit time Tx arrives, the setting unit 16 performs the processing from step S11 again and recalculates the set power values P1 to P3.

  In addition, the setting part 16 will calculate each charging current command value for supplying the electric power according to setting electric power value P1-P3 from each charging stand X, Y, Z, if setting electric power value P1-P3 is determined. The power control unit 12 of each charging station X, Y, Z is instructed. The charging current command value is calculated using set power values P1 to P3 and a reference voltage value (for example, 200V). The charging current command value is instructed to the charging control unit 14 of the vehicles A to C to be charged at the charging stations X, Y, and Z. And each charge control part 14 performs charge control according to a charging current command value.

Hereinafter, the operation of the vehicle charging system K of the present embodiment will be described according to a specific example shown in FIG.
FIG. 4A shows initial setting values of the peak power amount PP1, the control unit time Tx, the number of stations N, the minimum power amount Pmin, and the maximum power amount Pmax for explaining a specific example. These set values are input to the setting unit 16 of the vehicle charging system K by the installer of the vehicle charging system K.

  The setting unit 16 of the vehicle charging system K sets priority coefficients for the charging stations X, Y, and Z when the vehicles A to C are connected to the charging stations X, Y, and Z and charged at the same time. In this specific example, as shown in FIG. 4B, the priority coefficient Ka of the charging station X is “0.2”, the priority coefficient Kb of the charging station Y is “0.5”, and the priority coefficient Kc of the charging station Z. Is “1”. When such a priority coefficient is set, the priority is higher in the order of charging station X <charging station Y <charging station Z.

  And the setting part 16 determines the setting electric power value of the said charging station from the charging station with a low priority according to the priority coefficient set previously. First, the setting unit 16 determines the set power value P1 of the charging station X with low priority. In this specific example, the set power value P1 is determined according to Equations 1 to 3 shown in FIG. Specifically, the setting unit 16 calculates “0.7 kW” as the set power value P <b> 1 using Equation 1 and Equation 2 in the process of Step S <b> 12 of FIG. 3. Expression 1 is an expression for calculating the sum of the priority coefficients of the charging stations X, Y, and Z. Formula 2 is a formula that multiplies the amount of power (peak power amount PP1) that can be used for charging by the ratio of the priority coefficient Ka of the charging station X to the total value of Formula 1.

  Then, the setting unit 16 compares the calculated set power value P1 and the minimum power amount Pmin by Expression 3 in the process of step S13 in FIG. In this specific example, “0.7 kW” is calculated as the set power value P1, and this value is smaller than the minimum power amount Pmin (1.2 kW). Therefore, the setting unit 16 changes the set power value P1 of the charging station X from the calculated “0.7 kW” to “1.2 kW” of the minimum power amount Pmin in the process of step S14 of FIG. To do.

  Next, the setting unit 16 determines the set power value P2 of the charging station Y having a higher priority than the charging station X. In this specific example, the set power value P2 is determined according to Equations 4 to 7 shown in FIG. More specifically, the setting unit 16 calculates “4.8 kW” as the available power amount PP2 by Expression 4 in the process of step S16 in FIG. Expression 4 is an expression for subtracting the amount of power corresponding to the set power value P1 from the amount of power that can be used for charging (peak power amount PP1). Next, the setting unit 16 calculates “1.6 kW” as the set power value P <b> 2 by Expression 5 and Expression 6 in the process of Step S <b> 17 of FIG. 3. Expression 5 is an expression for calculating the sum of the priority coefficients of the charging stations Y and Z. Expression 6 is an expression that multiplies the available power amount PP2 by the ratio of the priority coefficient Kb of the charging station Y to the sum value of Expression 5.

  Then, the setting unit 16 compares the calculated set power value P2 and the minimum power amount Pmin by Expression 7 in the process of step S18 of FIG. In this specific example, “1.6 kW” is calculated as the set power value P2, and this value is larger than the minimum power amount Pmin (1.2 kW). Therefore, the setting unit 16 determines the set power value P2 of the charging station Y to the calculated “1.6 kW” in the process of step S20 of FIG.

  Next, the setting unit 16 determines the set power value P3 of the charging station Z with the highest priority and the highest priority. In this specific example, the set power value P3 is determined according to Equations 8 and 9 shown in FIG. Specifically, the setting unit 16 calculates “3.2 kW” as the set power value P3 according to Expression 8 in the process of step S21 of FIG. Expression 8 is an expression for subtracting the amount of power corresponding to the sum of the set power value P1 and the set power value P2 from the peak power amount PP1.

  Then, the setting unit 16 compares the calculated set power value P3 and the maximum power amount Pmax by Expression 9 in the process of step S22 of FIG. In this specific example, “3.2 kW” is calculated as the set power value P3, and this value is smaller than the maximum power amount Pmax (4 kW). Therefore, the setting unit 16 determines the set power value P3 of the charging station Z to the calculated “3.2 kw” in the process of step S24 of FIG.

  The setting unit 16 that has determined the set power values P1 to P3 of the charging stations X, Y, and Z in this way calculates a charge current command value for supplying the amount of power corresponding to the set power values P1 to P3. The charging current command value is transmitted to the power control unit 12 of each charging station X, Y, Z. Receiving the charging current command value, each power control unit 12 transmits the charging current command value to the charging control unit 14 of the vehicles A to C. And each charge control part 14 performs charge control of the storage battery 13 according to a charging current command value.

  In the vehicle charging system K of the present embodiment, when charging is performed simultaneously with a plurality of charging stations X, Y, and Z as described above, the priority order of the charging stations X, Y, and Z is determined, and the priority order is high. Control is performed so that the amount of power supplied to the charging station increases. The vehicle charging system K guarantees the minimum electric energy Pmin as the electric energy of the charging station with the lowest priority even when the electric energy supplied by the charging stations X, Y, Z is determined according to the priority. It is supposed to let you. That is, by assuring the minimum amount of power Pmin, the charging time of a vehicle charged at a charging station with a low priority is prevented from becoming extremely long. As a result, even when charging is performed simultaneously at a plurality of charging stations, it is possible to suppress a decrease in charging efficiency of the entire vehicle charging system K.

  FIG. 4C shows the set power value P1 of each charging station X, Y, Z when the maximum power amount Pmax is “3 kw” and the other initial set values are the values shown in FIG. A specific example of determining ~ P3 is shown. In this case, the set power value P3 of the charging station Z with high priority is calculated as “3.2 kw” based on the equations 8 and 9 as described above. This calculated “3.2 kW” is larger than the maximum power amount Pmax (3 kW) when the condition shown in FIG. 4C is applied. Therefore, the setting unit 16 changes the set power value P3 of the charging station Z from the calculated “3.2 kW” to “3 kW” of the maximum power amount Pmax by the process of step S23 of FIG. Then, the setting unit 16 recalculates the set power values P1 and P2 through the process of step S26 of FIG. 3 by setting the set power value P3 as the maximum power amount Pmax.

  The setting unit 16 first recalculates the set power value P1 of the charging station X with low priority. In this specific example, the set power value P1 is determined according to Equations 10 to 12 shown in FIG. More specifically, the setting unit 16 calculates “0.85 kW” as the set power value P1 using Expression 10 and Expression 11. Expression 10 is an expression for calculating the sum of the priority coefficients of the charging stations X and Y. Equation 11 shows the ratio of the priority coefficient Ka of the charging station X to the total value of Equation 10 by subtracting the amount of power corresponding to the set power value P3 from the amount of power that can be used for charging (peak power amount PP1). In the example, it is an expression for multiplying 3 kw).

  Then, the setting unit 16 compares the calculated set power value P1 with the minimum power amount Pmin. In this specific example, “0.85 kW” is calculated as the set power value P1, and this value is smaller than the minimum power amount Pmin (1.2 kW). For this reason, the setting unit 16 changes the determined power value P1 of the charging station X from the calculated “0.85 kw” to “1.2 kw” of the minimum power amount Pmin and determines it.

  Next, the setting part 16 determines the setting electric power value P2 of the charging stand Y in priority. In this specific example, the set power value P2 is determined according to Expressions 13 and 14 shown in FIG. Specifically, the setting unit 16 calculates “1.8 kW” as the set power value P <b> 2 according to Equation 13. Expression 13 subtracts the power amount for the set power value P1 from the power amount (3 kW in the specific example) obtained by subtracting the power amount for the set power value P3 from the power amount that can be used for charging (peak power amount PP1). It is an expression to do. Then, the setting unit 16 compares the calculated set power value P2 and the minimum power amount Pmin using Expression 14. In this specific example, “1.8 kW” is calculated as the set power value P2, and this value is larger than the minimum power amount Pmin (1.2 kW). For this reason, the setting unit 16 determines the set power value P2 of the charging station Y to the calculated “1.8 kW”.

  In the vehicle charging system K of the present embodiment, when the set power value P3 of the charging station with high priority is suppressed to the maximum power amount Pmax, the surplus amount of power that can be used for charging is distributed to other charging stations. . More specifically, when the set power values P1 and P2 are determined as shown in FIG. 4B, and the set power value P3 is suppressed to the maximum power amount Pmax (3 kW), it is used for charging. The amount of power is 1.2 kW + 1.6 kW + 3 kW = 5.8 kW. Since the peak power amount PP1 that can be used for charging is 6 kw, 0.2 kw is the surplus power. For this reason, the surplus is distributed to the charging stations X and Y as shown in FIG. Thereby, the vehicle charging system K of the present embodiment sets the maximum power amount Pmax so that the supplied power amount is not extremely biased to a specific charging station. And by distributing the surplus power generated by suppressing the maximum power amount Pmax to other charging stations, the power can be used to the maximum extent within the range of power amount that can be used for charging. Charging by each charging station X, Y, Z can be performed. As a result, even when charging is performed simultaneously at a plurality of charging stations, it is possible to suppress a decrease in charging efficiency of the entire vehicle charging system K.

  In addition, FIG. 4 demonstrated the case where it charges using all the charging stations X, Y, and Z, but when charging using one charging station, or using two charging stations. In this case, charging is performed as described below. Specifically, when charging is performed using one charging stand, charging is performed using a set power value that does not exceed the maximum power amount Pmax. When charging is performed using two charging stations, the set power value of the charging station is determined by the calculation method described with reference to FIG. 4 according to the priority coefficient.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) The setting unit 16 is configured such that the total amount of power supplied by each charging station X, Y, Z is equal to or less than a preset maximum supplied power amount (peak power amount PP1), and each charging station X, Y, Z Determines the amount of power of each charging station X, Y, Z so that the amount of power supplied by the battery becomes equal to or greater than a preset minimum amount of power Pmin. For this reason, even if the vehicle is connected to a charging station having a low priority, the electric power supplied to the vehicle is extremely reduced because the electric power corresponding to the minimum electric energy Pmin is supplied and charged. There is no. That is, the charging time of the vehicle does not become extremely long. Therefore, even when a plurality of vehicles are charged simultaneously using a plurality of charging stations X, Y, and Z, charging can be performed efficiently.

  (2) The setting unit 16 determines the electric energy of each charging station X, Y, Z so that the electric energy supplied by each charging station X, Y, Z does not exceed the preset maximum electric energy Pmax. For this reason, the amount of electric power supplied to a vehicle connected to a charging station with high priority is not extremely increased, and power can be reliably distributed to vehicles connected to other charging stations. it can. Therefore, it can charge efficiently.

  (3) The setting unit 16 determines the amount of power in order from the charging station with the lowest priority. For this reason, the electric energy more than minimum electric energy Pmin can be reliably ensured as the electric energy of the charging stand. As a result, the electric energy of each charging station X, Y, Z can be determined efficiently. That is, when it is determined from the power amount of the charging station having a high priority, there is a possibility that the minimum power amount Pmin cannot be secured as the power amount of the charging station having the lowest priority. In this case, the electric energy of each charging station X, Y, Z is recalculated. In order to set the electric energy of the charging station with the lowest priority to the minimum electric energy Pmin, the electric energy of other charging stations It is difficult to assume what value should be set, and there is a possibility that the arithmetic processing becomes complicated.

  (4) As a result of calculating the electric energy of each charging station X, Y, Z, when surplus power is generated, the surplus power is distributed to charging stations other than the charging station with the highest priority. For this reason, the electric energy of the other charging stand with a low priority can be enlarged. Therefore, it can charge efficiently.

  (5) By setting a priority coefficient for each control unit time Tx and calculating the electric energy of each charging station X, Y, Z, the vehicle connected to each charging station is efficiently or averagely charged. Can do. That is, a situation in which the charging time of any charging stand is extremely shortened does not occur, and it is possible to prevent the user from feeling unfair.

(Second Embodiment)
Hereinafter, a second embodiment that embodies this embodiment will be described with reference to FIGS.
Note that, in the embodiments described below, the same components as those in the embodiments described above are denoted by the same reference numerals, and redundant description thereof is omitted or simplified.

  In the vehicle charging system K of the present embodiment, the setting unit 16 is based on the current charge amount of the vehicle to be charged by each charging station X, Y, Z and the battery capacity of the storage battery 13 mounted on the vehicle. Determine the priority factor. The current charge amount is an amount that is actually charged in the storage battery 13 of the vehicle after the start of charging, and is an amount that does not consider the state of charge (SOC) at the start of charging. The battery capacity is the amount of full charge in the storage battery 13. And the setting part 16 of this embodiment performs the process which discriminate | determines the vehicle made into charge object, in order to determine a priority coefficient as mentioned above.

  As shown in FIG. 5, the setting unit 16 according to the present embodiment can set in advance a maximum charging current value and a battery capacity for each vehicle type by an input operation by the installer. The vehicle determination information is stored in the setting unit 16 in association with the maximum charging current value and the battery capacity for each vehicle type. The maximum charging current value is the maximum current value that can be handled when the charging control unit 14 of the vehicle charges the storage battery 13, and this value is determined by the conversion capability of the power converter that constitutes the charging control unit 14. Is done. In other words, the vehicle type can be identified from the current characteristics during charging by changing the configuration of the charging control unit 14 (such as the configuration of the power converter) for each vehicle. FIG. 6 shows an example of the maximum charging current value and the battery capacity associated with each vehicle type.

  The priority coefficient calculation process by the setting unit 16 will be described below with reference to FIG. The process of FIG. 7 corresponds to the process performed in step S11 in the process of FIG. 3 described in the first embodiment. In the present embodiment, the setting unit 16 that executes the following processing functions as a battery capacity determination unit and a vehicle type determination unit.

  The setting unit 16 determines the vehicle type from the current characteristics of the vehicle to be charged by each charging station X, Y, Z (step S30). In this determination, the setting unit 16 compares the current value flowing through the vehicle to be charged with the maximum charging current value set in advance, and identifies a matching vehicle type. For example, the setting unit 16 specifies the vehicle type G1 when the current value flowing through the vehicle matches the maximum charging current value D1, and specifies the vehicle type G2 when the current value flowing through the vehicle matches the maximum charging current value D2. To do. In addition, the setting unit 16 specifies the vehicle type G3 when the value of the current flowing through the vehicle matches the maximum charging current value D3. In the present embodiment, the power measuring unit 15 also measures the value of the current flowing through each charging station X, Y, Z. Then, the setting unit 16 performs the determination in step S30 using the current value measured by the power measurement unit 15.

  Next, the setting unit 16 calculates the battery capacity of the vehicle type set in advance based on the vehicle type specified in step S30 (step S31). For example, the setting unit 16 calculates the battery capacity E1 for the vehicle type G1, calculates the battery capacity E2 for the vehicle type G2, and calculates the battery capacity E3 for the vehicle type G3.

  Next, the setting unit 16 calculates the amount of power supplied to the charging stations X, Y, and Z based on the measurement result of the power measuring unit 15, and the charging stations X, Y, and Z are charged from the calculation result. The current charge amount of the target vehicle is acquired (step S32). Next, the setting unit 16 calculates and determines a priority coefficient based on the battery capacity calculated in step S31 and the current charge amount acquired in step S32 (step S33). And the setting part 16 which calculated the priority coefficient performs the process from step S12 in the process of FIG. 3 demonstrated in 1st Embodiment, and calculates the setting electric power value of each charging station X, Y, Z. The setting unit 16 calculates a charging current command value from the calculated set power value, and instructs the power control unit 12 of each charging station X, Y, Z.

Hereinafter, a method for determining the priority coefficient will be described with reference to specific examples shown in FIGS.
FIGS. 8 and 9 show a case where three vehicles A to C, that is, a vehicle A of the vehicle type G1, a vehicle B of the vehicle type G2, and a vehicle C of the vehicle type G3 are charged at the charging stations X, Y, and Z, respectively. It is an example.

  The setting unit 16 sets the priority coefficient Ka to “3” from the calculation formula shown in FIG. 9 when the battery capacity E1 of the vehicle A charged at the charging station X is “15 kWh” and the current charge amount W1 is “5 kWh”. And decide. Further, when the battery capacity E2 of the vehicle B to be charged at the charging station Y is “10 kWh” and the current charge amount W2 is “5 kWh”, the setting unit 16 sets the priority coefficient Kb from the calculation formula shown in FIG. 2 ”. Further, when the battery capacity E3 of the vehicle C to be charged at the charging station Z is “25 kWh” and the current charge amount W3 is “5 kWh”, the setting unit 16 sets the priority coefficient Kc from the calculation formula shown in FIG. 5 ”. Thus, when the priority coefficient of each charging station X, Y, Z is calculated, the priority is higher in the order of charging station Y <charging station X <charging station Z. And the setting part 16 determines the setting electric power value of the said charging station from the charging station with a low priority coefficient based on a priority coefficient according to the process of FIG. 3 demonstrated in 1st Embodiment.

Therefore, according to this embodiment, in addition to the effects (1) to (5) of the first embodiment, the following effects can be obtained.
(6) The priority coefficient is determined by the ratio between the battery capacity and the current charge amount. For this reason, as the amount of charge required to reach a fully charged state is increased, the set power value of the charging station can be set to a higher value, and the amount of power supplied can be increased. When the priority coefficient is determined based only on the current charge amount, for example, as illustrated in FIG. 8, if the charge amounts of the vehicles A to C are the same, the priority coefficient is the same. In other words, in this case, a vehicle with a high charge amount ratio and a low vehicle with respect to the battery capacity are charged under the same priority coefficient. However, according to the priority coefficient determination method of the present embodiment, a plurality of charging stations X, Y, and Z are used by charging by increasing the priority of a vehicle having a low charge amount ratio relative to the battery capacity. Even when charging a plurality of vehicles at the same time, charging can be performed efficiently.

  (7) Since the vehicle type is determined to obtain information necessary for calculating the priority coefficient, the accurate priority coefficient can be calculated even when the battery capacity differs for each vehicle. Then, information for vehicle type discrimination is set in advance, and the setting unit 16 automatically discriminates based on such information, so that a process of causing the user to input a vehicle type or the like can be omitted.

(8) Since the setting unit 16 determines the vehicle type from the current characteristics during charging, the vehicle type can be determined with a simple configuration.
In addition, you may change the said embodiment as follows.

The setting unit 16 may be provided in the power receiving facility 10 or may be provided in the charging stations X, Y, and Z.
O Two or three or more charging stations X, Y, and Z may be connected to the power receiving facility 10. Also in this case, the set power value of each charging station is determined using the same calculation method as in the embodiment.

  ○ The criteria for setting priority coefficients may be changed. For example, the priority order may be uniquely set for the charging stations X, Y, and Z. Moreover, you may change the charging stand with the highest priority, such as charging stand X-> charging stand Y-> charging stand Z-> charging stand X-> ... for every control unit time. Alternatively, the user may set a chargeable time, and a higher priority may be set from a charging stand having a short chargeable time. The chargeable time is set as the time from when the user connects the vehicle to the charging stand until the vehicle is used again. Further, the priority order may be set in the order of connection of vehicles to the charging stations X, Y, and Z (order of starting charging).

○ The set power value of each charging station X, Y, Z may be determined based on the peak power amount PP1 and the minimum power amount Pmin without setting the maximum power amount Pmax.
○ When charging at a plurality of charging stations X, Y, Z, the setting unit 16 resets the priority coefficient at the timing when charging of any charging station X, Y, Z is completed, and sets the set power value. Recalculation may be performed.

  ○ If the maximum charge power of a vehicle connected to a high-priority charging station is a factor and the vehicle cannot be charged according to the charge current command value corresponding to the set power value P3, The set power value P3 may be recalculated. In this case, since surplus power is generated, the surplus may be distributed as the amount of power supplied to the vehicle connected to another charging station.

  A power measuring unit 15 that measures the amount of power supplied to each vehicle by the charging stations X, Y, and Z may be provided at each charging station X, Y, and Z. And the setting part 16 may receive the measurement result of supplied electric energy from each charging stand X, Y, Z.

  O When the voltage value is constant in the vehicle charging system K or when the voltage value is regarded as constant, the power measurement unit 15 may be changed to a current measurement unit. In this case, the amount of electric power supplied from the measurement result can be calculated by measuring the current. Then, the setting unit 16 determines the charging current command value based on the measurement result of the current measuring unit so that the total amount of power supplied from each charging station X, Y, Z does not exceed the peak power amount PP1. To do.

The command value instructed by the setting unit 16 may be a charging current command value as in the embodiment, or may be a power command value or a voltage command value instead of the charging current command value.
The voltage may be measured by the power measuring unit 15 and the charging current command value may be calculated using the measured voltage value and the set power value calculated by the setting unit 16.

○ Transmission and reception of information between the vehicles A to C and the charging stations X, Y, and Z may be performed by wireless communication.
In the second embodiment, instead of or in addition to the maximum charging current value, the current rising characteristic may be set in the setting unit 16 as the current characteristic, and the vehicle type may be determined from the current rising characteristic. The current rising characteristic is a characteristic from when the current value is zero until it reaches a current value corresponding to the charging current command value.

  ○ The embodiment is embodied in a vehicle charging system in which charging is performed by mechanically connecting a charging plug to the vehicle, but the vehicle and the charging device (ground side equipment) are electrically connected without using the charging plug. Then, it may be embodied in a non-contact type vehicle charging system that performs charging. As shown in FIG. 10, in the non-contact type vehicle charging system, the power receiving side coil 21 attached to the vehicle 20 side is matched with the power transmitting side coil 23 of the ground side equipment 22 embedded in the floor of the charging station. Thus, the vehicle 20 is stopped. At this time, the power receiving side coil 21 and the power transmitting side coil 23 are separated and brought into a non-contact state. In the non-contact type vehicle charging system, the storage battery of the vehicle 20 is charged by receiving the power from the power transmission side coil 23 by the power reception side coil 21. Such a contactless vehicle charging system includes a resonance method and an electromagnetic induction method. In the non-contact type vehicle charging system, the vehicle-side controller 24 mounted on the vehicle 20 and the power-supply-side controller 25 installed on the ground-side facility 22 can communicate with each other wirelessly. That is, transmission / reception of a signal necessary for charging, such as a charging start / stop signal, is performed by wireless communication between the vehicle-side controller 24 and the power-side controller 25. In the non-contact type vehicle charging system, the ground-side equipment 22 corresponds to the charging stations X, Y, and Z that are power supply units in the embodiment, and the power receiving equipment 10, the power measuring unit 15, and the setting unit 16 are charged. It is provided in the station.

In the non-contact charging system described in the above other example, signal transmission / reception between the vehicle-side controller 24 and the power-supply side controller 25 may be superimposed on power transmission.
Next, the technical idea that can be grasped from the above embodiment and another example will be added below.

  (A) The power supply unit is connected to the vehicle to supply charging power to the vehicle, and has a plurality of the system as a whole. The vehicle charging system described in 1.

  (B) A vehicle charging system for charging a storage battery mounted on a vehicle, supplying electric power for charging to the vehicle, and having a plurality of power supply units in the entire system, and each power supply unit to the vehicle A power measurement unit that measures the amount of power supplied, a battery capacity determination unit that determines the battery capacity of the storage battery mounted on the vehicle, and a priority that sets the priority order that defines the amount of power supplied from each power supply unit A power setting unit, and the priority setting unit supplies the storage battery with respect to the battery capacity from the power supply unit based on the measurement result of the power measurement unit and the determination result of the battery capacity determination unit. The vehicle charging system is characterized in that the priority is set based on the proportion of the amount of charge charged with the electric power.

  (C) The vehicle includes a vehicle type determination unit that determines a vehicle type, and the battery capacity determination unit determines a battery capacity based on the vehicle type determined by the vehicle type determination unit. The vehicle charging system described.

  (D) A power amount determination unit that determines the amount of power supplied by each power supply unit according to the priority order, wherein the priority setting unit sets a high priority in order of increasing proportion, and determines the power amount The vehicle charging system according to the technical idea (b) or (c), wherein the unit increases the amount of power in descending order of priority.

  (E) The power amount determination unit is a minimum power in which the total amount of power supplied by each power supply unit is equal to or less than a preset maximum supply power amount and the power amount supplied by each power supply unit is preset. The vehicle charging system according to any one of the technical ideas (b) to (d), wherein the amount of power of each power supply unit is determined to be equal to or greater than the amount.

  (F) Based on the amount of power supplied by each power supply unit to the vehicle and the battery capacity of the storage battery mounted on the vehicle, the storage battery for the battery capacity was charged with the power supplied from the power supply unit. The vehicle charging method according to claim 7, wherein the priority is set based on a charge amount ratio.

(G) The vehicle charging method according to the technical concept (f), wherein the battery capacity is determined based on the vehicle type.
(H) a current measurement unit that measures the amount of current flowing to the vehicle side when power is supplied from each power supply unit, a battery capacity determination unit that determines the battery capacity of a storage battery mounted on the vehicle, and each power A priority setting unit that sets a priority order that defines the amount of power supplied from the supply unit, and the priority setting unit displays the measurement result of the current measurement unit and the determination result of the battery capacity determination unit. 5. The method according to claim 1, wherein the priority order is set based on a ratio of a charge amount with which the storage battery is charged with power supplied from the power supply unit with respect to the battery capacity. The vehicle charging system according to claim 1.

  DESCRIPTION OF SYMBOLS 13 ... Storage battery, 15 ... Electric power measurement part, 16 ... Setting part, AC ... Vehicle, K ... Vehicle charging system, P1-P3 ... Setting electric power value, PP1 ... Peak electric energy, Pmax ... Maximum electric energy, Pmin ... Minimum Electricity amount, X, Y, Z ... charging stand, E1-E3 ... battery capacity, G1-G3 ... vehicle type, W1-W3 ... charge amount.

Claims (7)

A vehicle charging system for charging a storage battery mounted on a vehicle,
While supplying electric power for charging to the vehicle, and a power supply unit having a plurality of the entire system,
A priority setting unit that sets a priority order that defines the amount of power supplied from each power supply unit;
A power amount determination unit that determines the amount of power supplied by each power supply unit according to the priority order, and
The power amount determination unit is configured such that a total amount of power supplied by each power supply unit is equal to or less than a preset maximum supply power amount, and a power amount supplied by each power supply unit is equal to or greater than a preset minimum power amount. A vehicle charging system characterized by determining the amount of power of each power supply unit.   The power amount determination unit further determines the power amount of each power supply unit so that the power amount supplied by each power supply unit does not exceed a preset maximum power amount. The vehicle charging system described.   The vehicle charging system according to claim 2, wherein the power amount determination unit determines the power amount in order from the power supply unit with the lowest priority.   When the power amount of the power supply unit with the highest priority is set to the maximum power amount when the power amount determination unit has a surplus in the amount of power that can be used for charging as a whole system, another power supply unit The vehicle charging system according to claim 3, wherein the power amount of the vehicle is determined again. A power measuring unit that measures the amount of power supplied to the vehicle by each power supply unit;
A battery capacity discriminating unit for discriminating the battery capacity of the storage battery mounted on the vehicle,
The priority setting unit, based on the measurement result of the power measurement unit and the determination result of the battery capacity determination unit, the amount of charge with which the storage battery with respect to the battery capacity is charged with the power supplied from the power supply unit The vehicle charging system according to any one of claims 1 to 4, wherein the priority order is set based on a ratio of the vehicle. It has a car type discriminating part that discriminates the car type,
The vehicle charging system according to claim 5, wherein the battery capacity determination unit determines a battery capacity based on the vehicle type determined by the vehicle type determination unit. A vehicle charging method for charging a storage battery of a vehicle using a vehicle charging system having a plurality of power supply units for supplying power for charging to the vehicle,
While setting the priority order that defines the amount of power supplied from each power supply unit, determine the amount of power supplied by each power supply unit according to the priority order, perform charging with the determined power amount, When determining the amount of power supplied by each power supply unit, the total amount of power supplied by each power supply unit is equal to or less than a preset maximum supply power amount, and the amount of power supplied by each power supply unit is determined in advance. A vehicle charging method, wherein the vehicle charging method is determined so as to be equal to or greater than a set minimum electric energy.