JP2016214029A - Vehicle charge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle charge system that is to be applied to a vehicle previously requiring information related to charging and suppresses the increase of a charging time.SOLUTION: A vehicle charge system is applied to a vehicle that mounts a secondary battery to supply traveling power and previously requires information related to charging when charging an on-vehicle battery Ba. The system includes: at least one charging unit 2 capable of outputting charging power; a power source device 3 for supplying power to the charging unit 2 and load apparatuses other than the charging unit 2; a power consumption prediction section for predicting power to be required in the load apparatuses; and a determination section for determining power which can be supplied to the charging unit 2 with the use of a difference between the suppliable power of the power source device 3 and the prediction power consumption predicted by the power consumption prediction section.SELECTED DRAWING: Figure 1

Description

  The present invention is a vehicle equipped with a secondary battery (hereinafter referred to as an in-vehicle battery) that supplies electric power for traveling, and is applied to a vehicle that requires information related to charging in advance when the in-vehicle battery is charged. It relates to a charging system.

  For example, in the invention described in Patent Document 1, “the smaller of virtual contract power and facility power facility capacity is set as the maximum available power, and it can be used under the maximum available power among the charging units included in the facility. The number of charging units is determined. "

JP 2012-228041 A

  When the power supply device supplies power to a plurality of charging units and load devices other than the plurality of charging units (for example, electric devices in a building), if the power consumption in the load devices increases, charging 1 There is a possibility that the electric power that can be supplied to one or a plurality of charging units is reduced.

  In addition, when charging an in-vehicle battery, for example, in a charging method compliant with the “CHAdeMO standard”, information related to charging (for example, output voltage value and current value) is transmitted to the vehicle side in advance when charging the in-vehicle battery. It is necessary to execute processing (hereinafter referred to as information exchange processing).

  For this reason, when the power that can be supplied to the charging unit decreases, it is necessary to interrupt the charging of the on-vehicle battery, execute the information exchange process again, and transmit the output voltage value and current value to the vehicle side. .

Therefore, if the information exchange process occurs before the charging is completed, an increase in charging time, an increase in power consumption accompanying an increase in charging time, and the like occur.
In view of the above points, an object of the present invention is to suppress an increase in charging time in a vehicle charging system that is applied to a vehicle that needs information related to charging in advance.

  In the present application, a vehicle equipped with a secondary battery (hereinafter referred to as an in-vehicle battery (Ba)) that supplies electric power for traveling, and the vehicle needs information about charging in advance when the in-vehicle battery (Ba) is charged. In the vehicle charging system applied to the above, power is supplied to at least one charging unit (2) capable of outputting charging power, the charging unit (2), and a load device other than the charging unit (2). And a power consumption prediction unit that predicts the power required by the load device, and a determination unit that determines the power that can be supplied to the charging unit (2). And a determining unit that determines the difference between the suppliable power and the predicted power consumption predicted by the power consumption prediction unit.

Thereby, in this invention, since generation | occurrence | production of an information exchange process can be suppressed, the increase in charging time can be suppressed. As a result, an increase in power consumption accompanying an increase in charging time can be suppressed.
When a plurality of charging units (2) are provided, the determination unit uses a difference between the suppliable power of the power supply device (3) and the predicted power consumption predicted by the power consumption prediction unit to It is possible to determine a charging unit that can supply power among the charging units (2).

  And it is desirable for a determination part to operate | move for every predetermined time by setting predetermined time as reference time. Specifically, the “predetermined time” is desirably a time that is a natural number times the “demand value” used when calculating the commercial power charge.

  In addition to the system power source (3A), the power supply device (3) is a secondary battery that stores the power generated by the solar power generation device (PV power generation device) (3B) and the solar power generation device (3B). (Hereinafter referred to as a stationary battery (3C)), a charging rate acquisition unit that acquires a charging rate of the stationary battery (3C), a system power source (3A), and a solar power generation device (3B) A charging unit that receives power from at least one to charge the stationary battery (3C), a start charging rate at which charging to the stationary battery (3C) should start, and a stop to stop charging the stationary battery (3C) A charging rate determination unit that determines a value of at least one of the charging rates, a charging rate value determined by the charging rate determination unit, and a charging unit based on the acquired charging rate acquired by the charging rate acquisition unit A control unit for controlling the charging rate determining unit It is desirable and a charging rate and daytime charging rate can be performed day and night setting process to different values.

  In this case, when charging is performed only with the power supplied from the system power source (3A), the start charge rate at night time is made larger than the start charge rate at daytime, and the stop charge rate at night time is set to start charge during the daytime. If it is larger than the rate, the stationary battery (3C) can be charged using cheap power such as midnight power.

  In addition, when charging with at least the power supplied from the solar power generation device (3B), the start charge rate at daytime is made larger than the start charge rate at night, and the stop charge rate at daytime is stopped at night If the charging rate is larger than the charging rate, the number of times of charging can be increased, and the amount of charge to the stationary battery (3C) can be increased in the daytime.

  And when charging with at least the power supplied from the solar power generation device (3B), the start charge rate and the stop charging are compared with the case of charging only with the power supplied from the system power source (3A). If the rate is increased, it is possible to charge the stationary battery (3C) with much of the power generated by the solar power generation device (3B).

  Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

1 is a conceptual diagram of a vehicle charging system 1 according to an embodiment of the present invention. It is a graph which shows a charging rate in the case of charging with system power. It is a graph which shows the charging rate in the case of charging also using PV electric power.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

  In the present embodiment, the vehicle charging system according to the present invention is applied to a facility in which a plurality of charging units such as an apartment house and a commercial facility are installed. Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that at least one member or part described with at least a reference numeral is provided, except for cases where “plural”, “two or more” and the like are omitted.

(First embodiment)
1. Configuration of Vehicle Charging System As shown in FIG. 1, the vehicle charging system 1 is a system for charging electric power to an EV vehicle such as an electric vehicle. The vehicle charging system 1 includes at least one charging unit 2, a power supply device 3, a control device 4, and the like.

  Note that an “EV vehicle” is a vehicle having an electric motor for traveling and is equipped with a secondary battery Ba (hereinafter referred to as an in-vehicle battery Ba) that supplies electric power for traveling to the electric motor. is there. Specifically, it means an electric vehicle (including a vehicle having an internal combustion engine dedicated to power generation), a hybrid vehicle (including a plug-in hybrid vehicle), and the like.

<Charging unit>
The charging unit 2 is a unit for outputting electric power for charging to the in-vehicle battery Ba. In the present embodiment, the first charging unit 2 </ b> A to the fifth charging unit 2 </ b> E are provided as the charging unit 2. Hereinafter, the first charging unit 2A to the fifth charging unit 2E are collectively referred to as a charging unit 2.

  The vehicle charging system 1 can be charged in accordance with the “CHAdeMO standard”. Specifically, when charging the in-vehicle battery Ba, a process (hereinafter referred to as an information exchange process) of transmitting information related to charging (for example, an output voltage value and a current value) to the vehicle side in advance is executed.

<Power supply unit>
The power supply device 3 supplies power to the charging unit 2 and load devices other than the charging unit 2. The load device according to the present embodiment refers to, for example, an electric device used in an apartment house or the like. The power supply device 3 uses a system power source (commercial power source) 3A, a solar power generation device 3B, a stationary battery 3C, and the like as power sources.

  The stationary battery 3C is a secondary battery that stores electric power generated by the solar power generation device 3B. The power generated by the solar power generation device 3B (hereinafter referred to as PV power) is preferentially supplied to the load device side. That is, the PV power is preferentially supplied to the load device.

  When the PV power exceeds the power consumption actually consumed by the load device, the surplus power (hereinafter referred to as surplus power) exceeding the power consumption is charged to the stationary battery 3C. When the PV power becomes less than the power consumption, the insufficient power is compensated from the system power source 3A.

  The battery control unit 3D controls the charging operation to the stationary battery 3C. Specifically, the battery control unit 3D acquires the charging rate (State of Charge) of the stationary battery 3C and monitors the charging rate of the stationary battery 3C.

  Then, when the charging rate of the stationary battery 3C becomes equal to or lower than the start charging rate, the battery control unit 3D starts charging the stationary battery 3C (hereinafter also referred to as recovery charging), and the charging rate is the stop charging rate. The recovery charge is terminated when the above is reached.

  The battery control unit 3D acquires the charging rate by using the voltage value of the stationary battery 3C or the integrated value of the current input to and output from the stationary battery 3C. In the present embodiment, whether or not the charging rate has reached the stop charging rate is acquired using the value of current flowing into the stationary battery 3C.

  Charging power supplied to the stationary battery 3C is supplied from at least one of the system power source 3A and the solar power generation device 3B. Specifically, when the stationary battery 3C can be charged with only surplus power, recovery charging is performed with PV power.

  When there is no surplus power, recovery charging is performed with power supplied from the grid power source 3A (hereinafter, grid power). When it is estimated that it is impossible to charge the stationary battery 3 </ b> C only with surplus power, recovery charging is performed with PV power and system power.

  The battery control unit 3D can execute day / night setting processing in which the charge rate at night and the charge rate during the day are different values. That is, the battery control unit 3D sets the nighttime start charge rate to a value larger than the daytime start charge rate when performing recovery charge only with the grid power. Furthermore, the battery control unit 3D sets the nighttime stop charge rate to a value larger than the daytime stop charge rate when performing recovery charging using only the grid power.

  That is, when recovery charging is performed using only the system power, it is executed in a time zone in which the power consumption of the load device is small. Specifically, in this embodiment, for example, the start charge rate is 39% from 1:00 to 3:59, the stop charge rate is 50%, and the start charge rate is 29% from 4:00 to 0:59. And the stop charging rate is 40% (see FIG. 2).

  The battery control unit 3D sets the start charge rate at daytime to a value larger than the start charge rate at night when performing recovery charging with at least power supplied from the solar power generation device 3B. Furthermore, the battery control unit 3D sets the stop charge rate during the daytime to a value larger than the stop charge rate during the night when performing recovery charging with at least the power supplied from the solar power generation device 3B.

  In other words, the battery control unit 3D can only perform recovery charging using surplus power and system power of the solar power generation device 3B or surplus power when the power generation by the solar power generation device 3B is possible, such as daytime in fine weather. When recovery charging is possible, recovery charging is performed only with surplus power.

  Specifically, the start charge rate is 56% and the stop charge rate is 60% (see FIG. 3). In other words, in this embodiment, when performing recovery charging using surplus power, the amount of surplus power stored is increased by increasing the start charging rate and stop charging power when performing recovery charging using only grid power. Yes.

  The battery control unit 3D according to the present embodiment is configured by incorporating software into a microcomputer having a CPU, a RAM, a ROM, and the like. That is, the charging rate acquisition unit that acquires the charging rate, the charging rate determination that determines the value of the charging rate, the charging unit that charges the stationary battery 3C, and the control unit that controls the charging unit are realized by the software (program). ing.

<Control device>
The control device 4 can execute power consumption prediction processing for predicting power required by the load device and determination processing for determining power that can be supplied to the charging unit 2. The control device 4 is configured such that software is incorporated in a microcomputer having a CPU, a RAM, a ROM, and the like.

  Software for executing the power consumption prediction process and the determination process is stored in advance in a non-volatile storage unit (not shown) such as a ROM. The prediction method executed in the power consumption prediction process is not questioned. In the present embodiment, power consumption in the current time zone is predicted using a past demand power history.

  In the determination process, power that can be supplied to the charging unit 2 (hereinafter referred to as chargeable power) is determined using a difference between the suppliable power of the power supply device 3 and the predicted power consumption predicted in the power consumption prediction process. To do.

  That is, a value obtained by subtracting predicted power consumption from suppliable power is chargeable power. In the present embodiment, the power supply device 3 includes a stationary battery 3C. For this reason, the power that can be supplied from the power supply device 3 includes the power stored in the stationary battery 3C.

  In the determination process according to the present embodiment, a charging unit (hereinafter referred to as an operable charging unit) that can supply power among the plurality of charging units 2 is determined based on the chargeable power.

  For example, in the determination process according to the present embodiment, the value obtained by dividing “chargeable power” by “power required to charge the vehicle battery Ba (hereinafter referred to as required charge power)” is the number of operable charging units. Is done.

  The required charging power is, for example, a past value or a value set by a manager of the vehicle charging system 1 or the like. In addition, when the value obtained by dividing the above does not become a natural number, a value obtained by rounding down the decimal point is the number of operable charging units.

  In the determination process, the operable charging unit is determined so as to include at least the charging unit 2 (in this embodiment, the second charging unit 2E) that can supply power from the stationary battery 3C.

  The determination process operates every predetermined time with a predetermined time (for example, midnight) as a reference time. The “predetermined time” is, for example, a time that is a natural number times (in this embodiment, 1 time) a “demand value” used when calculating the commercial power charge.

The “current time zone” in the power consumption prediction process refers to the time from when the previous determination process is executed until the next determination process is executed.
2. Characteristics of the Vehicle Charging System According to the Present Embodiment In this embodiment, the operable charging unit is determined using the difference between the power that can be supplied from the power supply device 3 and the predicted power consumption. Thereby, since generation | occurrence | production of an information exchange process can be suppressed, the increase in charging time can be suppressed. As a result, an increase in power consumption accompanying an increase in charging time can be suppressed.

  The battery control unit 3D sets the nighttime charge rate and the daytime charge rate to different values. Specifically, when charging is performed using only the power supplied from the grid power source 3A, the start charge rate at night is set larger than the start charge rate during the day, and the stop charge rate at night is set as the start charge during the day. Greater than rate.

Thereby, in this embodiment, 3 C of stationary batteries can be charged using cheap electric power, such as late-night electric power. As a result, it is possible to perform demand control that suppresses an increase in system power demand.
In addition, when charging is performed using at least the power supplied from the solar power generation device 3B, the daytime start charge rate is made larger than the night start charge rate, and the daytime stop charge rate is set to the night time stop charge rate. Make it bigger.

  Thereby, in this embodiment, it is possible to increase the number of times of recovery charging and to increase the amount of charge to the stationary battery 3C during the daytime. As a result, PV power can be effectively utilized.

  In this embodiment, when performing recovery charging using at least PV power, the start charge rate and the stop charge rate are increased as compared with the case where charging is performed using only the grid power. Thereby, most of the electric power generated by the solar power generation device 3B can be charged in the stationary battery 3C.

(Other embodiments)
In the above-described embodiment, the vehicle charging system 1 includes the stationary battery 3C. However, the present invention is not limited to this, and the vehicle charging system does not include the stationary battery 3C and the solar power generation device 3B. It is also applicable to the system.

  In the above-described embodiment, the charging rate acquisition unit that acquires the charging rate of the stationary battery 3C is realized by software incorporated in the battery control unit 3D, but the present invention is not limited to this, Dedicated hardware may be provided.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Vehicle charging system 2 ... Charging unit 3 ... Power supply device 3B ... Solar power generation device 3C ... Stationary battery 3A ... System power source 3D ... Battery control part 4 ... Control device

Claims (10)

In a vehicle charging system that is applied to a vehicle that is equipped with a secondary battery (hereinafter referred to as an in-vehicle battery) that supplies electric power for traveling and requires information related to charging in advance when the in-vehicle battery is charged. ,
At least one charging unit capable of outputting power for charging; and
A power supply device for supplying power to the charging unit and a load device other than the charging unit;
A power consumption prediction unit that predicts power required by the load device;
A determination unit that determines power that can be supplied to the charging unit, the determination unit using a difference between the power that can be supplied from the power supply device and the predicted power consumption predicted by the power consumption prediction unit; A vehicle charging system. There are at least two charging units,
The determination unit uses a difference between the suppliable power of the power supply device and the predicted power consumption predicted by the power consumption prediction unit to determine a charging unit capable of supplying power among the plurality of charging units. The vehicle charging system according to claim 1, wherein the vehicle charging system is determined.   3. The vehicle charging system according to claim 1, wherein the determination unit operates at predetermined time intervals with a predetermined time as a reference time. 4.   4. The vehicle charging system according to claim 3, wherein the "predetermined time" is a time that is a natural number times a "demand value" used when calculating a commercial power charge. In addition to the grid power source, the power supply device includes a solar power generation device and a secondary battery that stores the power generated by the solar power generation device (hereinafter referred to as a stationary battery).
A charge rate acquisition unit for acquiring the charge rate of the stationary battery;
A charging unit that receives power from at least one of the grid power source and the solar power generation device and charges the stationary battery;
A charge rate determination unit for determining a charge rate value of at least one of a start charge rate to start charging the stationary battery and a stop charge rate to stop charging to the stationary battery;
A control unit for controlling the charging unit based on the value of the charging rate determined by the charging rate determining unit and the acquired charging rate acquired by the charging rate acquiring unit;
The said charge rate determination part can perform the day and night setting process which makes the said charge rate at night time and the said charge rate in the daytime different from each other. The vehicle charging system according to Item.   6. In the day / night setting process, when charging is performed only with power supplied from the grid power source, the start charge rate at night is set to be larger than the start charge rate during daytime. The charging system for vehicles as described.   6. The charging method according to claim 5, wherein in the day / night setting process, when charging is performed only with the power supplied from the grid power source, the stop charging rate at night is set larger than the stop charging rate during the daytime. 6. The vehicle charging system according to 6.   In the day / night setting process, when charging is performed with at least electric power supplied from the solar power generation device, the start charge rate at daytime is set larger than the start charge rate at night. The vehicle charging system according to any one of 5 to 7.   In the day / night setting process, at least when charging is performed with electric power supplied from the solar power generation device, the stop charging rate at daytime is made larger than the stop charging rate at night. The vehicle charging system according to any one of 5 to 8.   In the day / night setting process, when charging is performed at least with the power supplied from the photovoltaic power generation apparatus, the start charging rate and the power are compared with when charging is performed only with the power supplied from the grid power source. The vehicle charging system according to any one of claims 5 to 9, wherein a stop charging rate is increased.