JP5817556B2 - Charging system - Google Patents

Description

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

  A charging system that charges a storage battery mounted on a vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle) is disclosed in Patent Document 1, for example. In the charging system of Patent Document 1, even when a plurality of vehicles are charged at the same time, the charging is controlled so as not to exceed the contracted capacity.

JP 2004-229355 A

  By the way, in a charging system, the electric power supplied with respect to a vehicle is determined, and the instruction | indication for performing charging according to the electric energy is performed. And a vehicle charges according to the instruction | indication from a charging system. However, the vehicle side does not always charge according to the instruction from the charging system. For example, when the storage battery is fully charged, the vehicle performs charging by reducing the amount of power charged in the storage battery. For this reason, in the charging system, if the vehicle side performs charging with a power amount smaller than the instructed power amount, the power allocated for charging the vehicle may be wasted. Therefore, it is desired that the charging system performs charging so that unnecessary power is not generated.

  This invention was made paying attention to the problem which exists in such a prior art, and the objective is to provide the charging system which can aim at the efficiency of charge.

In order to solve the above-mentioned problems, the invention according to claim 1 includes a charging unit that supplies power for charging a storage battery mounted on a vehicle to the vehicle, and power that is received from an electric power system. A power supply unit for supplying to the vehicle, a charge control unit for instructing the vehicle a charge command value based on a power setting value for controlling the power supplied to the vehicle, and the power supply unit A power measuring unit that measures the power actually supplied to the vehicle side by supplying power from the charging control unit, the charging control unit of the power measurement value and the power set value of the measurement result of the power measurement unit When the difference exceeds a predetermined difference, the gist is to reduce the power set value by a predetermined amount and to instruct the vehicle as a new command value a charge command value based on the reduced power set value.

  According to this, when the power measurement value and the power set value exceed a predetermined difference, the power set value is decreased and the charge command value is indicated. When the power set value is decreased, the amount of power supplied to the vehicle is also decreased. As a result, the charging system can allocate power to the vehicle without wasting power allocated to the vehicle for charging. Therefore, the efficiency of charging can be improved.

According to a second aspect of the present invention, there is provided a charging unit that supplies electric power for charging a storage battery mounted on a vehicle to the vehicle, and a power supply unit that supplies electric power received from an electric power system to the charging unit. A charging control unit that instructs a current command value based on a power setting value for controlling power supplied to the vehicle; and power supply from the power supply unit to the vehicle side. A current measurement unit that measures a current value that is actually supplied; In this case, the power set value is decreased by a predetermined amount, and the current command value based on the reduced power set value is instructed to the vehicle as a new command value.

  According to this, when the current measurement value and the current command value exceed a predetermined difference, the power set value is decreased and the current command value is indicated. When the current command value is decreased, the amount of power supplied to the vehicle is also decreased. As a result, the charging system can allocate power to the vehicle without wasting power allocated to the vehicle for charging. Therefore, the efficiency of charging can be improved.

  According to a third aspect of the present invention, in the charging system according to the first or second aspect, the charging control unit is configured to provide a new command when the state exceeding the predetermined difference continues for a predetermined time. The gist is to indicate a value to the vehicle.

  According to this, by adding an element of time to the determination as to whether or not to decrease the power setting value, the power setting value can be maintained when a predetermined difference is instantaneously exceeded. That is, there is no possibility that the amount of electric power supplied to the vehicle is reduced in a state where electric power is not wasted and the charging efficiency is lowered. Therefore, it is possible to reliably improve the efficiency of charging.

  According to a fourth aspect of the present invention, in the charging system according to any one of the first to third aspects, the power supply unit supplies power to a plurality of power supply targets including the charging unit. The charging control unit determines the amount of power supplied to each power supply target so that the total amount of power supplied to all power supply targets is equal to or less than a predetermined maximum supply power amount. .

  According to this, it is possible to control so that the amount of power supplied to the power supply target does not exceed the amount of power in the supply and demand contract. The charging system can allocate the amount of power so as not to exceed the amount of power in the supply and demand contract.

  According to a fifth aspect of the present invention, in the charging system according to the fourth aspect, the power supply target includes a plurality of charging units, and the charging control unit includes power of the charging unit exceeding the predetermined difference. The gist is to distribute the decrease in the set value to the power set value of other charging units.

  According to this, since the reduced amount of the power setting value is distributed to the power setting values of the other charging units, the amount of power supplied to the other charging units can be increased. In other words, the amount of power can be allocated within a range that does not exceed the amount of power in the supply and demand contract without causing waste of power. Therefore, the efficiency of charging can be improved.

  According to the present invention, charging efficiency can be improved.

The block diagram which shows the structure of a charging system. (A) is a graph showing the transition of the power measurement value when charging is performed based on the power setting value, and (b) is a power measurement when the power setting value is changed as the power measurement value decreases. A graph showing changes in values. The flowchart which shows the control process of electric current command value. Explanatory drawing explaining the transition of the electric energy supplied to the vehicle made into charge object. 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, a storage battery 11 that stores power supplied to an electric motor (motor) (not shown) that serves as a prime mover of the vehicle 10 </ b> A is mounted on a vehicle 10 </ b> A such as an EV or a PHV. In addition, a vehicle control unit 12 that controls charging of the storage battery 11 is mounted on the vehicle 10A. In addition, a power converter 13 is mounted on the vehicle 10A. Further, the vehicle 10A is equipped with a communication unit 14 serving as an information receiving unit and an information transmitting unit. Then, the storage battery 11 of the vehicle 10A is charged by the power converted from the power supplied from the vehicle charging system K by the power converter 13. In addition, the storage battery 11, the vehicle control part 12, the power converter 13, and the communication part 14 are mounted also about the other vehicles 10B and 10C shown in FIG. 1 similarly to the vehicle 10A. And the storage battery 11 mounted in these vehicles 10B and 10C is also charged with the electric power supplied from the charging system K.

Hereinafter, a specific configuration of the charging system K will be described with reference to FIG.
The charging system K is connected to the power receiving facility 15 that receives power transmitted from the power system, and the power receiving facility 15, and is connected to the vehicles 10A to 10C via the charging plug P when the vehicles 10A to 10C are charged. It consists of charging stands 16A, 16B, 16C. Charging stands 16A to 16C serve as a charging unit that supplies power for charging storage batteries 11 of vehicles 10A to 10C. The power receiving facility 15 is connected to a load facility as a power supply target to which power is supplied from the power receiving facility 15. The load facility is an object to which electric power is supplied by the power receiving facility 15 such as a lighting stand 16A to 16C or a lighting fixture arranged at a location where the charging system K is installed.

  In FIG. 1, for convenience of explanation, three charging stations 16 </ b> A to 16 </ b> C connected to the power receiving facility 15 are illustrated, and other load facilities are not illustrated. Moreover, charging stand 16A-16C is the same structure. Therefore, in FIG. 1, the detailed configuration of the charging stand 16A is illustrated, and the detailed configuration of the other charging stands 16B and 16C is not shown. The electric power system is a power transmission system for transmitting electric power and is owned by an electric power company. The charging plug P includes a power line for transmitting power and a signal line for transmitting and receiving information. The power receiving facility 15 and the charging stations 16A to 16C are connected by the power line L1 and the signal line L2.

  The power receiving facility 15 is provided with a power cut-off unit 17 serving as a main breaker that cuts off the power supply circuit when power that can be consumed from the power system is exceeded. The power available from the power system is determined by a supply and demand contract between the installer of the charging system K and the power company. In addition, the power receiving facility 15 is provided with a power supply unit 18 that supplies the power received from the power system to the charging stations 16A to 16C. The power received from the power system is the power supplied from the outside. The power receiving facility 15 is provided with a power measuring unit 19 that measures the amount of power supplied to each of the charging stations 16A to 16C. The power measuring unit 19 also measures a current value and a voltage value. The power receiving facility 15 is provided with a charge control unit 20 that instructs a current command value for charging when charging the storage battery 11 of the vehicles 10A to 10C. The current command value is a charge command value for supplying a predetermined amount of charging power from each of the charging stations 16A to 16C. In addition, the power receiving facility 15 is provided with a determination unit 21 that performs a determination process necessary for the charge control unit 20 to determine a current command value. In addition, the power receiving facility 15 is provided with a communication unit 22 serving as an information transmission unit and an information reception unit.

  The charge control unit 20 acquires a voltage value that is a measurement result of the power measurement unit 19. Further, the charging control unit 20 acquires a determination result from the determination unit 21. Further, the determination unit 21 acquires a power value that is a measurement result of the power measurement unit 19. Further, the determination unit 21 acquires information necessary for determination from the charge control unit 20.

  The charging control unit 20 of the power receiving facility 15 is connected to an input unit 23 for inputting various information by an input operation of the installer. In the present embodiment, the input unit 23 inputs a peak power set value (maximum supply power amount) Pmax, a determination threshold value Pt, a power reduction value Pd, and a determination time Tx. The peak power setting value Pmax is a value indicating the maximum amount of power supplied that is the total amount of power supplied by the power receiving facility 15. The determination threshold value Pt is a value used when the determination unit 21 performs a determination process. The power reduction value Pd is a value used when the charge control unit 20 acquires the determination result of the determination unit 21 and determines the current command value. The determination time Tx is a time used when the determination unit 21 performs a determination process.

  Each charging station 16A to 16C is provided with a communication unit 24 serving as an information transmission unit and an information reception unit. Each charging station 16A to 16C is provided with a power cut-off unit 25 serving as a branch breaker that cuts off the power supply circuit when the power handling capacity of the transmission line (power line L1) that supplies power to the vehicles 10A to 10C is exceeded. It has been.

  In the charging system K of the present embodiment, the charging control unit 20 determines a current command value that instructs the charging stations 16A to 16C to which the vehicles 10A to 10C to be charged are connected. At this time, the charging control unit 20 determines the current command value so that the total amount of power supplied from the power receiving facility 15 does not exceed the peak power set value Pmax. When determining the current command value, the charging control unit 20 first determines a power setting value to be distributed to the charging stations 16A to 16C. Next, the charging control unit 20 determines a current command value from the voltage value and the power setting value that are measurement results of the power measuring unit 19.

  The charge control unit 20 that has determined the current command value transmits the current command value to the communication units 24 of the charging stations 16A to 16C via the communication unit 22. Charging stands 16A-16C transmit the current command value received via communication unit 24 to vehicle control unit 12 of each vehicle 10A-10C. And each vehicle control part 12 charges the storage battery 11 based on the received electric current command value.

  When charging is performed by instructing the current command value as described above, the power measurement value that is the measurement result of the power measurement unit 19 is normally the power corresponding to the current command value as shown in FIG. It will follow the set value. Specifically, when the power setting value corresponding to the current command value is “Pa”, the amount of power supplied to the vehicle increases with time so as to follow the power setting value Pa, and then the power setting value is set. The amount corresponds to the amount of power corresponding to the value Pa, or the amount is within a predetermined range. Therefore, in the power measurement unit 19, the amount of power supplied to the vehicle is measured as the power measurement value Pm as described above.

  By the way, the vehicle control part 12 of vehicle 10A-10C performs control which reduces the electric energy supplied to the storage battery 11, when the charge condition of the storage battery 11 approaches a full charge state. That is, the vehicle control unit 12 sets a value lower than the current command value instructed from the charging system K and reduces the amount of power supplied to the storage battery 11. The fully charged state does not indicate 100% as the charge amount of the storage battery 11, but is set to a charge amount of less than 100% such as 90% in consideration of a decrease in the life of the storage battery 11 due to 100% charge. The state of charge is indicated by an SOC that indicates the amount of charge that is charged with respect to the capacity of the storage battery 11 as a ratio.

  As described above, when the amount of power supplied to the storage battery 11 by the vehicle control unit 12 is reduced, a difference is generated between the power set value Pa and the measured power value Pm as shown in FIG. FIG. 2B shows a state in which the power measurement value Pm, that is, the amount of power supplied to the storage battery 11 decreases from the elapse of time T1.

  Further, a maximum charging current value that can be handled when the vehicle control unit 12 charges the storage battery 11 is set in the vehicles 10A to 10C. This maximum charging current value is determined by the conversion capability of the power converter 13 mounted on the vehicles 10A to 10C. For this reason, when charging the storage battery 11 of the vehicles 10A to 10C, even if a current command value larger than the maximum charging current value is instructed, the vehicles 10A to 10C are charged based on the instructed current command value. Can not. That is, the vehicle control unit 12 of the vehicles 10 </ b> A to 10 </ b> C supplies the storage battery 11 with the amount of power corresponding to the maximum charging current value to perform charging. Further, when the vehicle control unit 12 of the vehicles 10A to 10C starts charging in a state close to a fully charged state, even if the instructed current command value is a value that can be handled at the time of charging, the current command Charging is performed by supplying the storage battery 11 with an amount of power smaller than the amount of power corresponding to the value.

  As described above, the charging control unit 20 distributes the electric energy to the charging stations 16A to 16C so that the total electric energy supplied from the power receiving facility 15 does not exceed the peak power setting value Pmax. The storage battery 11 can be charged in a shorter time as the current command value is closer to the maximum charging current value determined by the conversion capability of the power converter 13. For this reason, as the difference between the electric energy corresponding to the current command value and the electric power measurement value Pm increases, it is more efficient for the entire system to supply the electric power corresponding to the difference to another vehicle to perform charging. Charging can be performed.

  Therefore, in the charging system K of the present embodiment, the difference between the power setting value corresponding to the current command value and the amount of power supplied to the storage battery 11 (power measurement value Pm) is monitored, and the difference exceeds a predetermined difference. In this case, control is performed to change the amount of power distributed and supplied to the charging stations 16A to 16C. FIG. 2B illustrates a state where the power set value Pa is changed to the power set value Pb because the difference between the power set value Pa and the power measured value Pm exceeds a predetermined difference. The power setting value Pb is a value obtained by subtracting the power reduction value Pd from the power setting value Pa. In the present embodiment, the predetermined difference is determined by the determination threshold value Pt.

  Hereinafter, the control content for determining the current command value will be described with reference to FIGS. 2 and 3. In addition, the control content demonstrated below is the process performed for one charging stand. When charging is performed at a plurality of charging stations, the control content described below is performed on each charging station.

  The charging control unit 20 sets the power setting value Pa of the charging station to be charged (step S10). The power set value Pa set in step S10 is set to a value such that the total amount of power supplied from the power receiving facility 15 does not exceed the peak power set value Pmax. Next, the charge control unit 20 acquires a voltage value Vm that is a measurement result of the power measurement unit 19 (step S11). Next, the charging control unit 20 calculates the current command value Ia based on the power set value Pa set in step S10 and the voltage value Vm acquired in step S11 (step S12). The current command value Ia can be calculated by power setting value / voltage value. Then, the charging control unit 20 transmits the current command value Ia calculated in step S12 to the charging station via the communication unit 22 (step S13).

  The current command value Ia transmitted in step S13 is transmitted to the vehicle control unit 12 of the vehicle to be charged through the communication unit 24 of the charging station. Receiving the current command value Ia, the vehicle control unit 12 receives the amount of power based on the current command value Ia from the power supply unit 18 and the charging stand and charges the storage battery 11. Thereby, electric power equivalent to the electric power set value Pa based on the current command value Ia is supplied to the vehicle to be charged. Therefore, the measurement result of the power measuring unit 19 is an amount that matches the power set value Pa or an amount within a predetermined range (state shown in FIG. 2A).

  And the determination part 21 acquires the electric power measurement value Pm as a measurement result of the electric power measurement part 19, and determines the difference of the present electric power setting value Px and the electric power measurement value Pm (electric power amount actually supplied) ( Step S14). In step S14, the determination unit 21 compares the power measurement value Pm with the subtraction power value obtained by subtracting the determination threshold value Pt from the current power setting value Px. When the power measurement value Pm is larger than the subtraction power value, the determination unit 21 makes a negative determination in step S14 and returns to the process in step S14. On the other hand, when the power measurement value Pm is smaller than the subtraction power value, the determination unit 21 makes a positive determination in step S14. That is, when affirmative determination is made in step S14, the difference between the current power setting value Px and the power measurement value Pm exceeds a predetermined difference.

  Therefore, the determination unit 21 subsequently determines whether or not the time after the difference between the current power setting value Px and the power measurement value Pm exceeds a predetermined difference has passed the determination time Tx (step S15). ). The process of step S15 is performed so that the current command value is not changed when the condition for affirmatively determining step S14 occurs instantaneously for some reason. That is, in the present embodiment, the current command value is changed when a state where the difference between the current power setting value Px and the power measurement value Pm can continuously exceed a predetermined difference can occur. Therefore, if the state where the difference between the current power setting value Px and the measured power value Pm does not exceed the predetermined difference does not continue for the determination time Tx, the determination unit 21 makes a negative determination in step S15 and determines in step S14. Return to processing. On the other hand, when the state where the difference between the current power setting value Px and the power measurement value Pm exceeds the predetermined difference continues for the determination time Tx, the determination unit 21 determines that Step S15 is positive. In FIG. 2B, the determination time Tx is shown as time T2 to time T3.

  When the determination unit 21 makes a positive determination in step S15, the charge control unit 20 sets a new power setting value Pb (step S16). In step S16, the charging control unit 20 sets a value obtained by subtracting the power reduction value Pd from the current power setting value Px as a new power setting value Pb. Next, the charge control unit 20 acquires a voltage value Vm that is a measurement result of the power measurement unit 19 (step S17). Next, the charging control unit 20 calculates a current command value Ib based on the power setting value Pb set in step S16 and the voltage value Vm acquired in step S17 (step S18). Then, the charging control unit 20 transmits the current command value Ib calculated in step S18 to the charging station via the communication unit 22 (step S19).

  The current command value Ib transmitted in step S19 is transmitted to the vehicle control unit 12 of the vehicle to be charged through the communication unit 24 of the charging station. Receiving the current command value Ib, the vehicle control unit 12 receives the amount of power based on the current command value Ib from the power supply unit 18 and the charging stand and charges the storage battery 11. Thereby, electric power equivalent to the electric power set value Pb based on the current command value Ib is supplied to the vehicle to be charged. Thereby, the electric energy supplied to the storage battery 11 is changed.

  Thereafter, the charging control unit 20 and the determination unit 21 repeatedly perform the processing from step S14 until charging is completed. That is, the change control of the amount of power supplied to the storage battery 11 is repeated until charging is completed. Specifically, after transmitting the current command value Ib in step S19, the determination unit 21 performs the process of step S14 with the power setting value Pb set in step S16 as the current power setting value Px. When the determination unit 21 makes a positive determination again in steps S14 and S15, the charging control unit 20 sets the power set value Pb again and calculates and transmits the current command value Ib.

  When the above control is performed, the amount of electric power supplied to the vehicle decreases, and the amount of electric power corresponding to the decrease becomes the surplus electric energy. For this reason, the charging control unit 20 sets the power setting value of the other charging station so as to distribute the surplus power amount to the other charging station. As a result, the amount of power supplied to the vehicle at the other charging station is increased, and charging can be performed efficiently. Note that the charging control unit 20 distributes the surplus power amount to the charging station where the power amount is not changed.

Hereinafter, the effect | action of the charging system K of this embodiment is demonstrated using FIG.
FIG. 4 shows an example of a technique for distributing electric energy to the three charging stations X, Y, and Z. In addition, “Pg” in the figure indicates the amount of power corresponding to one scale in the graph of FIG.

  In the example of FIG. 4, each power setting value when charging is not performed at each charging station X, Y, Z (time a) is set to a value obtained by dividing the peak power setting value Pmax into three equal parts. Specifically, the power setting value at this time is set to the power amount (4 × Pg) corresponding to four scales.

  When charging is performed at the charging station X at time b, the charging control unit 20 sets the power setting value to the power amount for the four scales, and calculates and transmits a current command value corresponding to the power amount. To do. As a result, the vehicle connected to the charging station X is charged with the amount of power corresponding to four divisions. Thereafter, when the determination unit 21 determines that the amount of power of the charging station X has decreased, the charging control unit 20 sets a new power setting value as the power setting value of the charging station X and corresponds to the amount of power. The current command value is calculated and transmitted. Thereby, in the charging stand X, the electric power based on the changed electric power setting value is supplied and charging is performed. In the example of FIG. 4, power for two scales is supplied to the charging station X at time c.

  On the other hand, the charge control unit 20 distributes the surplus power generated by changing the power setting value of the charging station X to the power setting values of the other charging stations Y and Z. Specifically, as shown at time d, surplus power (for two scales) is distributed to charging stations Y and Z, respectively. Thereby, in the example of FIG. 4, the power setting values of the charging stations Y and Z are increased by one scale from the power amount of the four scales to become the power amount of the five scales.

  When charging is performed at the charging station Y at time e, the charging control unit 20 sets the power setting value to the power amount corresponding to the five scales, and calculates and transmits a current command value corresponding to the power amount. To do. As a result, the vehicle connected to the charging station Y is charged with the electric power for five divisions. Thereafter, when the determination unit 21 determines that the power amount of the charging station Y has decreased, the charging control unit 20 sets a new power setting value as the power setting value of the charging station Y and corresponds to the power amount. The current command value is calculated and transmitted. Thereby, in the charging stand Y, the electric power based on the changed electric power setting value is supplied and charging is performed. In the example of FIG. 4, electric power for three scales is supplied to the charging station Y at time f.

  On the other hand, the charging control unit 20 distributes the surplus power generated by changing the power setting value of the charging station Y to the power setting values of the other charging stations Z. Specifically, as shown in time g, surplus power (for two scales) is distributed to the charging station Z. Thereby, in the example of FIG. 4, the power setting value of the charging station Z is increased by 2 scales from the power quantity of 5 scales to become the power quantity of 7 scales. When charging is performed at the charging station Z at time h, the charging control unit 20 sets the power setting value to the power amount corresponding to the 7 scales, and calculates and transmits a current command value corresponding to the power amount. To do. As a result, the vehicle connected to the charging station Z is charged with the electric power for 7 divisions. Further, in the example of FIG. 4, charging of the vehicle connected to the charging station X is completed at time h.

  Thereafter, when the determination unit 21 determines that the power amount of the charging station Z has decreased, the charging control unit 20 sets a new power setting value as the power setting value of the charging station Z and corresponds to the power amount. The current command value is calculated and transmitted. Thereby, in the charging stand Z, the electric power based on the changed electric power setting value is supplied and charging is performed. In the example of FIG. 4, electric power for three scales is supplied to the charging station Z at time i.

  On the other hand, the charging control unit 20 distributes the surplus power generated by changing the power setting value of the charging station Z to the power setting values of the other charging stations X. Specifically, as shown at time j, surplus power (for two scales) is distributed to the charging station X. Thereby, in the example of FIG. 4, the power setting value of the charging station X is increased by 2 scales from the power quantity of 2 scales to become the power quantity of 4 scales. In addition, as shown at time k, the charging control unit 20 increases the power setting value of the charging stand Y by one division from the power amount of the three divisions after the charging of the vehicle connected to the charging stand Y is completed. The amount of power for 4 scales. Then, as shown at time l, when charging of all the charging stations X to Z including the charging station Z is completed, the charging control unit 20 sets the power setting value of each charging station X to Z to the power amount corresponding to four scales. Set to.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) When the power measurement value Pm and the current power setting value Px exceed a predetermined difference, the power setting value is decreased and a current command value is indicated. When the power set value is decreased, the amount of power supplied to the vehicle is also decreased. As a result, the charging system K can allocate electric power to the vehicle without wasting electric power allocated to the vehicle for charging. Therefore, the efficiency of charging can be improved.

  (2) By adding an element of time (determination in step S15) to determine whether or not to decrease the current power setting value Px, the power setting value is maintained when a predetermined difference is exceeded momentarily. be able to. That is, there is no possibility that the amount of electric power supplied to the vehicle is reduced in a state where electric power is not wasted and the charging efficiency is lowered. Therefore, it is possible to reliably improve the efficiency of charging.

  (3) The charging control unit 20 sets the power setting values of the charging stations 16A to 16C so as not to exceed the peak power setting value Pmax. Therefore, the charging stations 16A to 16C can be charged so as not to exceed the power in the supply and demand contract.

  (4) By distributing the decrease in the power setting value to the power setting values of the other charging stations, the amount of power supplied to the other charging stations can be increased. In other words, the amount of power can be allocated within a range that does not exceed the amount of power in the supply and demand contract without causing waste of power. Therefore, the efficiency of charging can be improved.

  (5) By performing the power amount redistribution, the power corresponding to the peak power setting value Pmax (or the upper limit amount of power that can be used) can always be used. In the charging system K, not all charging stations are always charging. For this reason, by controlling the present embodiment, it is possible to suppress contract power by suppressing generation of useless power and performing power redistribution. Therefore, the cost of the installer of the charging system K can be suppressed.

  (6) A target to redistribute electric energy is a charging station that does not perform electric energy change control. Note that the fact that the change control of the electric energy is not performed means that charging is performed with the power setting value set first. Thereby, the electric energy of the charging stand whose power setting value has already been changed is not increased. That is, no wasteful power is generated.

In addition, you may change this embodiment as follows.
The power amount corresponding to the power reduction value Pd and the power amount corresponding to the determination threshold value Pt may be the same amount or different amounts. In the case of different amounts, the amount of power corresponding to the power reduction value Pd is preferably made smaller than the amount of power corresponding to the determination threshold value Pt.

  ○ The determination content of step S14 may be changed. Specifically, the difference between the power measurement value Pm and the current power setting value Px may be compared with the determination threshold value Pt. If the difference is larger than the determination threshold value Pt, an affirmative determination may be made in step S14.

The determination threshold value Pt, the power reduction value Pd, and the determination time Tx may be variable values that can be changed, or may be preset in the charge control unit 20 as fixed values.
The determination threshold value Pt and the power reduction value Pd may be used as coefficients. For example, a setting such as 10% or 15% with respect to the power setting value may be used.

  A single charging stand 16A is connected to the power receiving facility 15, and another load facility (power supply target) different from the charging stand 16A is connected, and the charging control unit 20 is similar to the embodiment in the charging stand 16A. You may control the electric energy supplied to. For example, this configuration can be a home charging system. The load equipment in this case is a household electrical appliance.

(Circle) the charge control part 20 may transfer to step S16 by setting affirmative determination of step S14, and may set the new electric power setting value Pb.
The charging control unit 20 may be provided outside the power receiving facility 15.

  (Circle) you may provide the charge control part 20 in either of several charging stand 16A-16C. In this case, the charging station provided with the charging control unit 20 and the other charging station are connected by a signal line so as to transmit and receive signals. And the charge control part 20 performs control similarly to embodiment.

  O While providing a control part in each charging stand 16A-16C, you may provide the control part (charging control part 20) which controls the control part of each charging stand 16A-16C in the power receiving equipment 15 collectively. In this case, the power setting value is calculated by the control unit of the power receiving facility 15, and the power setting value is transmitted to the control units of the charging stations 16A to 16C. And the control part of each charging station 16A-16C calculates an electric current command value based on an electric power setting value, and transmits to a vehicle.

The charging control unit 20 and the determination unit 21 may be a single control unit.
O When the voltage value is constant in the charging system K or when the voltage value is regarded as constant, the power measuring unit 19 may be changed to a current measuring unit. In this case, the amount of electric power supplied from the measurement result can be calculated by measuring the current. Then, the charging control unit 20 determines the current command value based on the measurement result of the current measuring unit so that the total amount of power supplied from the power receiving facility 15 does not exceed the peak power set value Pmax. In addition, the charge control unit 20 compares the measurement result (current measurement value) of the current measurement unit with the current command value, and when the difference exceeds a predetermined difference, the power control value is decreased by a predetermined amount and the decrease The current command value based on the subsequent power setting value is indicated as a new command value. The power reduction value Pd and the determination threshold value Pt at this time may be voltage values or current values.

The charge command value instructed by the charge control unit 20 may be a current command value as in the embodiment, or may be a power command value or a voltage command value instead of the current command value.
O Information transmission / reception with vehicles 10A-10C, charge stands 16A-16C, and power receiving equipment 15 may be performed by wireless communication.

  In the embodiment, the surplus power is equally distributed to other charging stations, but the distribution method may be changed. For example, all or a large amount of surplus power may be distributed to a specific charging station. Also, if surplus power is generated when charging at multiple charging stations at the same time, even if the surplus power is distributed to the charging stations that started charging earlier among other charging stations On the contrary, the surplus power may be distributed to a charging station that starts charging later. Priorities are set in advance for charging stations, and if surplus power is generated, the surplus power may be distributed first from the charging station with the highest priority, or distributed in descending order of priority. The amount may be increased.

  (Circle) you may provide the electric power measurement part 19 for every charge stand 16A-16C. In this case, each power measurement unit 19 transmits the measurement result to the charge control unit 20. Moreover, the electric power measurement part 19 for every charging stand 16A-16C may be incorporated in each charging stand 16A-16C, and the electric power line L1 which connects the electric power supply part 18 of the receiving device 15 and each charging stand 16A-16C It may be arranged. This another example can be similarly applied even when a current measuring unit is provided.

  The embodiment is embodied in the charging system K that performs charging by mechanically connecting the charging plug P to the vehicles 10A to 10C, but without using the charging plug P, the vehicle and the charging unit (ground side equipment) It may be embodied in a non-contact charging system in which charging is performed by electrically connecting the two. As shown in FIG. 5, in the non-contact charging system, the power receiving side coil 30 attached to the vehicle 10 side and the power transmitting side coil 32 of the ground side equipment 31 embedded in the floor of the charging station are aligned. Thus, the vehicle 10 is stopped. At this time, the power receiving side coil 30 and the power transmitting side coil 32 are separated and brought into a non-contact state. In the non-contact charging system, the storage battery of the vehicle 10 is charged by receiving the power from the power transmission side coil 32 by the power reception side coil 30. Such a contactless charging system includes a resonance method and an electromagnetic induction method. In the non-contact charging system, the vehicle-side controller 33 mounted on the vehicle 10 and the power-side controller 34 installed on the ground-side facility 31 can communicate 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 33 and the power-supply side controller 34. In the non-contact charging system, the ground side equipment 31 corresponds to the charging stations 16A to 16C serving as a charging unit in the embodiment, and the power receiving equipment 15 is provided in the charging station.

  In the non-contact charging system described in the above other example, transmission / reception of signals between the vehicle-side controller 33 and the power-side controller 34 may be performed while being superimposed on power transmission.

  DESCRIPTION OF SYMBOLS 10,10A-10C ... Vehicle, 11 ... Storage battery, 15 ... Power receiving equipment, 16A-16C ... Charging stand, 18 ... Electric power supply part, 19 ... Electric power measurement part, 20 ... Charge control part, K ... Charging system, Ia, Ib ... current command value, Pa, Pb, Px ... power setting value, Pm ... power measurement value, Pd ... power reduction value, Pt ... judgment threshold, Pmax ... peak power setting value, Tx ... judgment time.

Claims (5)

In a charging system comprising: a charging unit that supplies power for charging a storage battery mounted on a vehicle to the vehicle; and a power supply unit that supplies power received from an electric power system to the charging unit.
A charge control unit that instructs the vehicle on a charge command value based on a power setting value for controlling the power supplied to the vehicle;
A power measuring unit that measures the power that is actually supplied to the vehicle by power supply from the power supply unit,
The charge control unit decreases the power set value by a predetermined amount when the difference between the power measurement value as the measurement result of the power measurement unit and the power set value exceeds a predetermined difference, and the power after the decrease A charging system that instructs a charge command value based on a set value to the vehicle as a new command value. In a charging system comprising: a charging unit that supplies power for charging a storage battery mounted on a vehicle to the vehicle; and a power supply unit that supplies power received from an electric power system to the charging unit.
A charge control unit for instructing the vehicle a current command value based on a power setting value for controlling the power supplied to the vehicle;
A current measuring unit that measures a current actually supplied to the vehicle by power supply from the power supply unit, and
When the difference between the current measurement value that is the measurement result of the current measurement unit and the current command value exceeds a predetermined difference, the charge control unit decreases the power set value by a predetermined amount, and the power after the decrease A charging system, wherein a current command value based on a set value is instructed to the vehicle as a new command value.   3. The charging according to claim 1, wherein the charging control unit instructs the vehicle to provide a new command value when the state exceeding the predetermined difference continues for a predetermined time. system. The power supply unit supplies power to a plurality of power supply targets including the charging unit,
The charge control unit determines the amount of power supplied to each power supply target so that the total amount of power supplied to all the power supply targets is equal to or less than a predetermined maximum supply power amount. The charging system according to any one of claims 1 to 3. The power supply target includes a plurality of charging units,
5. The charging system according to claim 4, wherein the charging control unit distributes a decrease in the power setting value of the charging unit exceeding the predetermined difference to the power setting value of another charging unit.