JP2013046557A - Home discharge control device and home discharge control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a home discharge control device which accurately detects the remaining capacity of an external battery with a current sensor for large current when storage power of the external battery is used for a home load.SOLUTION: A home discharge control device includes: a voltage sensor 9 detecting output voltage of an external battery 20; a power sensor 11 detecting load power of a home load 30; a control part 21 calculating a calculation value of a first discharge current of the external battery 20 from the detection results of the voltage sensor 9 and the power sensor 11; and a DC/DC converter 15 controlling the discharging of the first discharge current from the external battery 20 for supplying the electric power to the home load 30. The DC/DC converter 15 causes the first discharge current to be discharged to the home load 30 when the calculation value is equal to or higher than a first predetermined value.

Description

  The present invention relates to an in-house discharge control apparatus and an in-house discharge control method in which a storage battery mounted on a vehicle such as an electric vehicle is connected to an in-house load and discharged, and is used for at least part of the power consumption of the in-house load.

  Conventionally, a home discharge control device has been proposed in which a storage battery mounted on an electric vehicle is connected to a home power conditioner (hereinafter referred to as a power conditioner) and the stored power of the electric vehicle storage battery is used for the home load (electric equipment). (Patent Documents 1 and 2).

  In an electric vehicle used in this apparatus, it is important to accurately detect the remaining capacity of the storage battery. This is because if the detected remaining capacity is larger than the actual remaining capacity, the electric vehicle may not move even if the remaining capacity of the storage battery still appears. This is because if the capacity is smaller than the remaining capacity, the storage battery is excessively charged during charging, leading to deterioration of the storage battery, and the travel distance of the electric vehicle may be significantly reduced.

  FIG. 21 is a diagram showing an example of a schematic configuration diagram of each of a conventional in-home discharge control device and an electric vehicle. As shown in FIG. 21, the electric vehicle 100 includes a storage battery 101, a current sensor 102, and a control unit 103. The storage battery 101 is detachably connected to the power conditioner 106 in the house 105 via the power line 108. The current sensor 102 detects the charging / discharging current of the storage battery 101 flowing through the power line 108. The control unit 103 converts the current value detected by the current sensor 102 into a remaining capacity (SOC: State of Charge) of the storage battery 101 and manages the remaining capacity. The remaining capacity information (SOC information) managed by the control unit 103 is transmitted to the power conditioner 106 through the communication line 104. The power conditioner 106 uses the stored power of the storage battery 101 for the home load (electric device) 107 by controlling charging / discharging of the storage battery 101 of the electric vehicle 100 based on the remaining capacity information.

  The method for converting the current value to the remaining capacity of the storage battery 101 is generally a method of converting the remaining capacity by the integrated current (for example, Patent Documents 3 and 4). A method of converting the remaining capacity from the characteristics (Patent Document 5) is known.

JP 2001-8380 A (published on January 12, 2001) JP 2007-330083 A (published on December 20, 2007) Japanese Patent Laid-Open No. 10-288654 (released on October 27, 1998) JP 2010-60300 A (published March 18, 2010) JP 2006-343230 A (published on December 21, 2006)

  However, in any of the above conversion methods, in order to accurately grasp the remaining capacity of the storage battery 101, it is necessary to accurately detect the current value of the discharge current of the storage battery 101. In particular, in the method of converting the remaining capacity using the generally used accumulated current, the detected remaining capacity may deviate greatly from the actual remaining capacity by accumulating the current value even with a slight current detection error. .

  When discharging from the storage battery 101 to the home load 107, it is conceivable that the discharge amount of the discharge varies greatly according to the consumption amount of the home load 107. At the time of charging the storage battery 101, a large current of about 130 A flows in the rapid charge (50 kW), and a large current of about 22 A flows in the fast charge (8 kW). However, when discharging from the storage battery 101 to the home load 107, only a small current of about 0.5 A may flow due to fluctuations in the consumption of the home load 107.

  As the current sensor 102, it is necessary to use a sensor that can detect a large current during charging of the storage battery 101. However, in such a current sensor 102, a detection error for a small current becomes very large. In some cases, the discharge current to 107 cannot be accurately detected.

  Normally, the detection accuracy of the current sensor 102 is about ± several% of the maximum detection value. Therefore, when the current sensor 102 as described above detects a small current, the ratio of the detection error of the current sensor 102 to the detection value is small. It becomes very large and the detection accuracy is low.

  For example, a current sensor that can detect a current during 50 kW rapid charging has a detection error of about ± 3 A, and a current sensor that can detect a current flowing through an 8 kW system for home use has a detection error of about ± 0.5 A. is there. In such a current sensor, a detection error of about ± 0.5 A or ± 3 A exists for a discharge current of about 0.5 A.

  Thus, if the detection error at the time of discharge by the current sensor 102 becomes large, the remaining capacity of the storage battery 101 cannot be accurately detected.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to use the remaining capacity of an external storage battery for a large current when the stored power of an external storage battery such as a storage battery of an electric vehicle is used for a residential load. It is an object of the present invention to provide an in-house discharge control device and an in-house discharge control method that can be accurately detected by the current sensor.

  In order to solve the above problems, a home discharge control device according to the present invention is a home discharge control device that is detachably connected to a predetermined external storage battery and controls discharge from the external storage battery to a home load, Detected by a first detector that detects the output voltage of the external storage battery, a second detector that detects the load power of the residential load, and the output voltage detected by the first detector and the second detector A calculation unit for calculating a calculated value of a first discharge current discharged from the external storage battery from the generated load power, and the first discharge current from the external storage battery to supply power to the residential load. A first discharge control unit that controls the discharge of the battery, and the first discharge control unit discharges the first discharge current to the home load when the calculated value is equal to or greater than a first predetermined value. It is characterized by that.

  A home discharge control method according to the present invention is a home discharge control method for controlling discharge from a predetermined external storage battery to a home load, the first detection step of detecting the output voltage of the external storage battery, and the home load A first discharge current discharged from the external storage battery from a second detection step for detecting load power, the output voltage detected in the first detection step, and the load power detected in the second detection step And a first discharge control step for controlling discharge of the first discharge current from the external storage battery in order to supply electric power to the home load, and the first discharge In the control step, when the calculated value is equal to or greater than a first predetermined value, the first discharge current is discharged to the home load.

  Note that the above “load power of home load” means the power consumed by the home load during operation.

  According to the above configuration, when the calculated value is equal to or greater than the first predetermined value, the first discharge current is discharged to the home load, so the first discharge current at the time of discharge is the first predetermined value. It becomes the above value. By setting a relatively large current value of, for example, about 10 A as the first predetermined value, the first discharge current can be set to a relatively large current value of, for example, about 10 A.

  Thus, the first discharge current can be accurately detected using the current sensor for detecting a large current. Therefore, in the case where the stored power of the external storage battery is used for a home load, the remaining capacity of the external storage battery can be accurately detected by the large current sensor.

  A home discharge control device according to the present invention is a home discharge control device that is detachably connected to a predetermined external storage battery and controls discharge from the external storage battery to a home load, and the home discharge control device is in operation. A first discharge control unit that controls the first discharge current from the external storage battery to be a first predetermined value is provided.

  According to the above configuration, the first discharge current always becomes the first predetermined value because the first discharge current is controlled to the predetermined value during the operation of the residential discharge control device. By setting a relatively large current value of, for example, about 10 A as the first predetermined value, the first discharge current can be set to a relatively large current value of, for example, about 10 A. In addition, when the surplus discharge current which is not utilized by the residential load among the first discharge currents is generated, for example, as will be described later, it is conceivable to charge a storage battery different from the external storage battery with the surplus discharge current. .

  Thus, the first discharge current can be accurately detected using the current sensor for detecting a large current. Therefore, in the case where the stored power of the external storage battery is used for a home load, the remaining capacity of the external storage battery can be accurately detected by the large current sensor.

  In addition, as a result of controlling the first discharge current to the first predetermined value, it is possible to avoid an unexpected situation in which the remaining capacity of the external storage battery rapidly decreases.

  In the residential discharge control device according to the present invention, the external storage battery is preferably a storage battery mounted on a vehicle.

  According to said structure, since it is a storage battery mounted in the vehicle, the storage battery mounted in the vehicle can be utilized for home load.

  In the in-home discharge control device according to the present invention, the first discharge control unit maintains the first discharge current at the first predetermined value or more when the calculated value is at least the first predetermined value. It is desirable to control the current according to the load power to discharge to the home load.

  According to the above configuration, since the first discharge current is controlled to a current having a magnitude corresponding to the load power, even if the load power fluctuates in a range where the load current is equal to or greater than the first predetermined value, there is no excess or deficiency. The first discharge current of the external storage battery can be discharged to the home load.

  In the in-home discharge control apparatus according to the present invention, the first discharge control unit may cause the first discharge current to be greater than the first predetermined value when the calculated value is equal to or greater than the first predetermined value. 2 It is desirable to control so as not to exceed a predetermined value and to discharge to the in-house load.

  According to the above configuration, since the first discharge current is controlled so as not to exceed the second predetermined value that is larger than the first predetermined value, the first discharge current can be prevented from becoming a large current. It is possible to prevent a sudden decrease in the remaining capacity of the external storage battery.

  In the in-home discharge control device according to the present invention, the first discharge control unit is configured to set the first discharge current to the first predetermined value when the calculated value is equal to or greater than the first predetermined value. It is desirable to control and discharge to the residential load.

  According to the above configuration, when the calculated value is equal to or greater than the first predetermined value, the first discharge current is controlled to be the first predetermined value and discharged, so the first discharge current is a large current. This can prevent the external storage battery from rapidly decreasing. In addition, when the first discharge current is discharged, the current value becomes the first predetermined value, so that the first discharge current can be accurately detected.

  A configuration for dealing with a case where the first discharge current is insufficient with respect to a necessary load current will be described below.

  The in-home discharge control device according to the present invention further includes a stationary storage battery and a second discharge control unit that controls the discharge of the second discharge current from the stationary storage battery in order to supply electric power to the in-house load. And the second discharge control unit, when the calculated value is larger than the first predetermined value, reduces the second discharge current by a portion of the load power that is insufficient for the discharge of the first discharge current. It is desirable to control so as to compensate for the discharge to the in-house load.

  According to the above configuration, the second discharge current is discharged to the home load so as to compensate for the shortage of the first discharge current in the load power, so that the shortage of the supplied power is reduced by the discharge of the stationary storage battery. Can be supplemented with.

In the residential discharge control device according to the present invention, a commercial power system is connected to the residential load.
When the calculated value is larger than the first predetermined value, the system current from the commercial power system is controlled so as to compensate for the shortage of the load power due to the discharge of the first discharge current, It is desirable to further include a third discharge control unit that discharges the house load.

  According to the above configuration, since the grid current from the commercial power system is discharged to the residential load so as to compensate for the shortage of the first discharge current in the load power, the shortage of the supplied power is reduced to the commercial power system. Can be supplemented with.

  The in-home discharge control device according to the present invention further includes a stationary storage battery, and a second discharge control unit that controls the discharge of the second discharge current from the stationary storage battery in order to supply power to the load. When the calculated value is larger than the second predetermined value, the second discharge control unit supplements the second discharge current with a portion of the load power that is insufficient for the discharge of the first discharge current. It is desirable to control so that it discharges to the said house load.

  According to the above configuration, the second discharge current is discharged to the home load so as to compensate for the lack of the first discharge current in the load power, so the magnitude of the first discharge current is set to the second predetermined value. By suppressing it to the value or less, the shortage of the remaining capacity of the external storage battery can be prevented, and the shortage of the supplied power can be compensated by the discharge of the stationary storage battery.

  In the residential discharge control apparatus according to the present invention, a commercial power system is connected to the residential load, and when the calculated value is larger than the second predetermined value, a system (* And a third discharge control unit that controls the current to compensate for the shortage of the first discharge current in the load power and outputs the current to the residential load. It is desirable.

  According to the above configuration, since the grid current from the commercial power grid is output to the residential load so as to compensate for the shortage of the load power due to the discharge of the first discharge current, the magnitude of the first discharge current is reduced. By suppressing it to the second predetermined value or less, the shortage of the remaining capacity of the external storage battery can be prevented, and the shortage of the supplied power can be compensated by the commercial power system.

  In the residential discharge control device according to the present invention, it is preferable that the first discharge control unit stops the first discharge current when the calculated value is less than the first predetermined value.

  When the calculated value is less than the first predetermined value and the first discharge current is discharged, the first discharge current becomes less than the first predetermined value and can be accurately detected by the current sensor for large current. Disappear.

  According to the above configuration, when the calculated value is less than the first predetermined value, the first discharge current is stopped. Therefore, inaccurate detection by the current sensor for large current is prevented, and the remaining of the external storage battery is prevented. The capacity can be accurately detected by a current sensor for large current.

  The in-home discharge control device according to the present invention further includes a stationary storage battery and a second discharge control unit that controls the discharge of the second discharge current from the stationary storage battery in order to supply electric power to the in-house load. The second discharge control unit preferably discharges the second discharge current to the home load when the calculated value is less than the first predetermined value.

  According to the above configuration, when the calculated value is less than the first predetermined value (that is, when the external storage battery is not discharged), the stationary storage battery is discharged. Therefore, even when the external storage battery is not discharged, the stationary storage battery is discharged. Load electric power can be covered by the discharge of the storage battery.

  In the residential discharge control apparatus according to the present invention, a commercial power system is connected to the residential load, and when the calculated value is less than the first predetermined value, the grid current from the commercial power system is calculated. It is desirable to further include a third discharge control unit that outputs to the home load.

  According to the above configuration, when the calculated value is less than the first predetermined value (that is, when the external storage battery is not discharged), the grid current from the commercial power system is output to the home load, so the external storage battery Even when the battery is not discharged, the load power can be covered by the output current of the commercial power system.

  A home discharge control device according to the present invention includes a stationary storage battery, a second discharge control unit that controls charging / discharging of the stationary storage battery, a detection unit that detects load power of the home load, and detection by the detection unit. A determination unit that determines a magnitude relationship between the generated load power and the first power supplied by the first discharge current of the first predetermined value, and the second discharge control unit includes the load power Is larger than the first power, the second discharge current from the stationary storage battery is controlled so as to compensate for the lack of the discharge of the first discharge current in the load power. It is desirable to discharge the load.

  According to the above configuration, since the second discharge current is discharged to the home load so as to compensate for the lack of the first discharge current in the load power, accurate detection of the remaining capacity of the external storage battery, and In addition to the above-described effect of preventing the sudden decrease in the remaining capacity of the external storage battery, an effect of being able to compensate for the shortage of the supplied power by discharging the stationary storage battery is achieved.

  In the residential discharge control device according to the present invention, when the calculated value is smaller than the first predetermined value, the second discharge control unit generates a surplus that is not consumed as the load power in the first discharge current. It is desirable to charge the stationary storage battery.

  According to said structure, since the surplus part which is not consumed with load electric power among 1st discharge currents is charged to a stationary storage battery, it can prevent making a 1st discharge current useless.

  In the in-home discharge control device and the in-house discharge control method according to the present invention, the calculated value of the first discharge current from the external storage battery obtained from the output voltage of the external storage battery and the load power of the home load is not less than a first predetermined value. In some cases, the first discharge current from the external storage battery is discharged to the home load.

  Further, the home discharge control device and the home discharge control method according to the present invention provide a first discharge current from the external storage battery as a first during operation of the home discharge control device that controls discharge from the external storage battery to the home load. It is controlled so as to have a predetermined value, and is discharged to the above-mentioned residential load.

  Therefore, when the stored power of the external storage battery is used for a home load, the remaining capacity of the external storage battery can be accurately detected by the current sensor for large current.

It is a figure explaining an example of a structure of the household discharge control apparatus which concerns on Embodiment 1 of this invention. It is a figure explaining the basic composition of the DCDC converter of FIG. It is a flowchart explaining operation | movement of the household discharge control apparatus which concerns on Embodiment 1 of this invention. It is a figure explaining the operation | movement according to the fluctuation | variation of the load electric power in the residential discharge control apparatus which concerns on Embodiment 1 of this invention. It is the figure which showed an example of the relationship of the output voltage-output current of the DCDC converter of Embodiment 1 of this invention. It is the figure which showed an example of the relationship between the various variables of Embodiment 1 of this invention, and the calculated value of load current, (a) is the voltage of the electric circuit P2, (b) is various variables Is the output current of each DCDC converter, (c) shows the case where the various variables are the discharge current of the external storage battery. It is the figure which showed an example of the relationship of the output voltage-output current of the DCDC converter of Embodiment 2 of this invention. It is the figure which showed an example of the relationship between the various variables of Embodiment 2 of this invention, and the calculated value of load current, (a) is the voltage of the electric circuit P2, (b) is various variables Is the output current of each DCDC converter, (c) shows the case where the various variables are the discharge current of the external storage battery. It is a figure explaining the operation | movement according to the fluctuation | variation of the load electric power in the residential discharge control apparatus which concerns on Embodiment 2 of this invention. It is the figure which showed an example of the relationship of the output voltage-output current of the DCDC converter of Embodiment 3 of this invention. It is the figure which showed an example of the relationship between the various variables of Embodiment 3 of this invention, and the calculated value of load current, (a) is the voltage of the electric circuit P2, (b) is various variables Is the output current of each DCDC converter, (c) shows the case where the various variables are the discharge current of the external storage battery. It is a figure explaining the operation | movement according to the fluctuation | variation of the load electric power in the residential discharge control apparatus which concerns on Embodiment 3 of this invention. It is a figure explaining an example of a structure of the household discharge control apparatus which concerns on Embodiment 4 of this invention. It is the figure which showed an example of the relationship of the output voltage-output current of the DCAC converter of Embodiment 4 of this invention. It is the figure which showed an example of the relationship between the various variables of Embodiment 4 of this invention, and the calculated value of load current, (a) is the voltage of the power line P3, (b) is various variables Is the output current of each DCDC converter, (c) shows the case where the various variables are the discharge current of the external storage battery. It is a figure explaining the operation | movement according to the fluctuation | variation of the load electric power in the residential discharge control apparatus which concerns on Embodiment 4 of this invention. It is a figure explaining the operation | movement according to the fluctuation | variation of the load electric power in the residential discharge control apparatus which concerns on Embodiment 5 of this invention. It is the figure which showed an example of the structure of the household discharge control apparatus which concerns on Embodiment 6 of this invention. It is the figure which showed the other example of the structure of the household discharge control apparatus which concerns on Embodiment 6 of this invention. It is the figure which showed the further another example of the structure of the household discharge control apparatus which concerns on Embodiment 6 of this invention. It is a figure explaining an example of the structure of the conventional in-home discharge control apparatus.

  Hereinafter, embodiments of the present invention will be described in detail.

[Embodiment 1]
(Constitution)
One embodiment of the in-house discharge control device of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, the in-house discharge control device 1 according to the present embodiment is installed in a building T, for example, and is detachably connected to an external storage battery 20 via a power line P1, and is connected to an in-house load from the storage battery 20. The discharge to 30 is controlled.

  As the storage battery 20, for example, a storage battery provided in the vehicle K can be used. The vehicle K is, for example, an electric vehicle (hereinafter also referred to as an electric vehicle K). In addition, if the vehicle K is a vehicle provided with the storage battery, it will not be specifically limited.

  In addition, the storage battery 20 is not limited to what was mounted in the vehicle, For example, a stationary storage battery may be sufficient. Here, for example, the capacity of the storage battery 20 is assumed to be sufficiently larger than the capacity of a stationary storage battery 5 described later.

  The electric vehicle K generally includes a storage battery 20, a current sensor 22, and a control unit 24. The storage battery 20 has an output end 20a for discharging the discharge current (first discharge current), and a power line P1 from the in-home discharge control device 1 can be detachably connected to the output end 20a. ing. The current sensor 22 detects a discharge current discharged from the output end 20 a of the storage battery 20, and is disposed at the output end 20 a of the storage battery 20, for example. The control unit 24 detects the remaining capacity of the storage battery 20 based on the current value detected by the current sensor 22 by a known method, and manages the remaining capacity.

  With this configuration, in the electric vehicle K, by connecting the power line P1 to the output end 20a, the discharge current of the storage battery 20 can be discharged (that is, supplied) to the home discharge control device 1 via the power line P1. At that time, the discharge current is detected by the current sensor 22, and the remaining capacity of the storage battery 20 is detected and managed by the control unit 24 based on the detection result.

  The residential load 30 is an electrical device arranged in the building 50, and here is an AC load 30a that operates with an alternating current (AC). The home load 30 represents one or more electrical products. Although only one home appliance 30 is illustrated in FIG. 1, a plurality of home additions are connected in parallel to the home discharge control device 1. Also good.

  The in-home discharge control device 1 includes a power conditioner (hereinafter referred to as a power conditioner) 3 and a stationary storage battery 5.

  The power conditioner 3 calculates the discharge current discharged from the storage battery 20 according to the load power of the home load 30 and switches the storage battery to be discharged to the home load 30 among the storage batteries 5 and 20 according to the calculated value. is there.

  More specifically, when the calculated value is equal to or greater than a predetermined value Io (not shown, a first predetermined value), the power conditioner 3 stops discharging the storage battery 5 and causes the residential load 30 to discharge the discharge current of the storage battery 20. On the other hand, when the calculated value is less than the predetermined value Io, the discharge of the storage battery 20 is stopped and the discharge current (second discharge current) of the storage battery 5 is discharged to the home load 30. That is, the power conditioner 3 discharges the discharge current of the storage battery 20 to the home load 30 only when the discharge current of the storage battery 20 is equal to or greater than the predetermined value Io.

  The predetermined value Io is set to a current value (for example, about 10 A) that reduces the detection error when the current sensor 22 of the vehicle K detects the discharge current discharged from the storage battery 20 to the power conditioner 3. Thus, in the present embodiment, the discharge current from the storage battery 20 to the home load 30 is always greater than or equal to the predetermined value Io, and thus the discharge current is always detected with high accuracy by the current sensor 22.

  For example, when the battery capacity of the storage battery 20 is 16 kWh and the battery voltage is 330 V, consider a case where the storage battery 20 is charged by 80% for 30 minutes by rapid charging. In this case, when applied to the formula of (charging current (A) × battery voltage (V)) × time (h) = battery capacity (kWh) × charge amount (%), the charging current at that time is about 80 A. . Actually, when the battery capacity is low, the battery voltage decreases, so the charging current becomes larger and becomes about 100A. The current sensor 22 corresponds to a maximum current of about 100 A so that this charging current can be accurately detected. In this case, the current sensor 22 can generally accurately detect a current of about 10% of the maximum current (and hence about 10 A) or more.

  In an electric vehicle, when discharging is performed in addition to charging, the direction of current flow is reversed between charging and discharging, and thus the current value is represented by the opposite sign between charging and discharging. If a sensor corresponding to about ± 100 A is used as the current sensor 22, a current of about 10 A or more, which is 10% of the maximum discharge current 100 A (5% of the maximum charge / discharge current width 200 A), is accurately measured. Can be detected.

  Therefore, as described above, by setting the predetermined value Io to, for example, about 10 A, the charging current from the power conditioner 3 to the storage battery 20 and the discharge current from the storage battery 20 to the power conditioner 3 can be accurately detected by the current sensor 22. It becomes like this.

  The power conditioner 3 includes a DCDC converter 15 (first discharge control unit), a DCDC converter 17 (second discharge control unit), a DCAC converter 19, a voltage sensor 9 (first detection unit), and a power sensor 11 (second detection). Unit) and a control unit 21 (calculation unit).

  The input end 15a of the DCDC converter 15 is connected to the power line P1, and the output end 15b of the DC converter 15 is connected to the input end 19a of the DCAC converter 19 via the electric circuit P2. The input end 17a of the DCDC converter 17 is connected to the output end 5b of the storage battery 5, and the output end 17b of the DCDC converter 17 is connected to the input end 19a of the DCAC converter 19 via the electric circuit P2. The output end 19b of the DCAC converter 19 is connected to the home load 30 via the electric circuit P3.

  The voltage sensor 9 is disposed at the input end 15a of the DCDC converter 15, for example, and detects the output voltage of the storage battery 20. The power sensor 11 is disposed on a power line P3 that connects the output end 19b of the DCAC converter 19 and the home load 30, for example, and obtains the load power of the home load 30.

  The control unit 21 controls the operation / stop of each converter 15, 17, 19.

  More specifically, the control unit 21 discharges from the storage battery 20 according to the load power of the residential load 30 from the output voltage detected by the voltage sensor 9 and the load power detected by the power sensor 11. (Here, the discharge current of the storage battery 20 when the storage battery 5 is stopped) (= load power ÷ output voltage of the storage battery 20) is calculated.

  Then, the control unit 21 determines whether or not the calculated value is equal to or greater than a predetermined value Io, and controls the operation / stop of the DCDC converter 15 according to the determination result. Here, the control unit 21 operates the DCDC converter 15 when the calculated value is equal to or greater than the predetermined value Io, and stops the DCDC converter 15 when the calculated value is less than the predetermined value Io. Note that the control unit 21 always operates the DCDC converter 17 and the DCAC converter 19 while the in-home discharge control device 1 is operating.

  The DCDC converter 15 controls the discharge current of the storage battery 20 in order to supply electric power to the home load 30. The DCDC converter 15 is stopped by the control unit 21 when the calculated value is less than the predetermined value Io, and is operated by the control unit 21 only when the calculated value is greater than or equal to the predetermined value Io, and the discharge current of the storage battery 20 is reduced. Output to the DCAC converter 19.

  The relationship between the output voltage V1 and the output current I1 of the DCDC converter 15 at that time is set as shown in FIG. That is, when the output current I1 is less than the predetermined value Ia, the output voltage V1 becomes Va (a constant value), and when the output current I1 reaches the predetermined value Ia, the output voltage V1 varies such that Vb ≦ V1 ≦ Va. It has become. Here, Va and Vb are not particularly limited, but Ia is a sufficiently large value (for example, a value that cannot actually occur).

  With this setting, when the calculated value is equal to or greater than the predetermined value Io and less than the predetermined value Ia ′ (not shown), the DCDC converter 15 maintains a discharge current from the storage battery 20 to a value corresponding to the load power while maintaining the predetermined value Io or higher. The discharge current is output as the output current I1, and the output voltage V1 is controlled to Va. Ia ′ is a value of the input current of the DCDC converter 15 (discharge current of the storage battery 20) when the output current I1 is Ia.

  In general, the input voltage (the output voltage of the storage battery 20), the input current (the discharge current of the storage battery 20), the output voltage V1, and the output current I1 of the DCDC converter 15 are generally input voltage × input current × efficiency = output current. × Output voltage is related. This relationship is the same for the DCDC converter 17.

  As described above, the DCDC converter 15 is stopped by the control unit 21 when the calculated value is less than the predetermined value Io, but in the stopped state, the output voltage V1 of the DCDC converter 15 is 0 (zero). become. Considering this stop state, the relationship between the output voltage V1 and the output current I1 of the DCDC converter 15 is effective only when I1 ≧ Io ′ as shown in FIG. 5B, and when I1 <Io ′, Although not shown, V1 = 0. Io ′ is the output current I1 when the discharge current of the storage battery 20 is Io (in other words, the bus current flowing in the electric circuit P2 (= (output voltage of the storage battery 20) × (discharge current of the storage battery 20) × efficiency / (Voltage of electric circuit P2))).

  The DCDC converter 17 controls the discharge current of the storage battery 5 in order to supply electric power to the home load 30.

  The DCDC converter 17 outputs the discharge current of the storage battery 20 to the DCAC converter 19. The relationship between the output voltage V2 and the output current I2 of the DCDC converter 17 at that time is set as shown in FIG. That is, when the output current I2 is less than the predetermined value Ib, the output voltage V2 becomes Vc (a constant value), and when the output current I2 reaches the predetermined value Ib, the output voltage V2 varies as Vd ≦ V1 ≦ Vc. It has become. Vc is set lower than Va, and Ib is set higher than Io.

  With this setting, as will be described later, when the calculated value is less than the predetermined value Io, the DCDC converter 17 converts the discharge current from the storage battery 5 to load power within a range less than Io ′, as will be described later. When the calculated value is equal to or greater than the predetermined value Io, the output of the output current I2 (that is, the discharge current of the storage battery 5) is output. Stop.

  In this in-home discharge control device 1, how much current is output from which DCDC converter 15, 17 is determined as follows depending on the setting of the above output voltage-output current.

  The voltage VP2 of the electric circuit P2 is the higher of the output voltages V1 and V2 of the DCDC converters 15 and 17. As a result, the output current (I1 or I2) of the higher DCDC converter (15 or 17) is selectively output to the electric circuit P2 as a bus current flowing through the electric circuit P2, and is passed through the DCAC converter 19 to the residential load 30. Discharged.

  Therefore, when Vc is set lower than Va as described above (ie, Vc <Va), when the calculated value is equal to or greater than the predetermined value Io (ie, when I1 ≧ Io ′), FIG. c) Since V1 = Va and V2 ≦ Vc and V1> V2, the voltage VP2 of the electric circuit P2 is equal to the output voltage V1 (= Va) of the DCDC converter 15 as shown in FIG. Become.

  On the other hand, when the calculated value is less than the predetermined value Io (that is, when I1 <Io ′), V1 = 0 and V2 = Vc (> 0) according to FIGS. 5B and 5C, and V2> V1. Therefore, as shown in FIG. 6A, the voltage VP2 of the electric circuit P2 becomes equal to the output voltage V2 (= Vc) of the DCDC converter 17.

  FIG. 6A is a diagram showing the relationship between the voltage VP2 of the electric circuit P2 and the bus current, where the vertical axis is the voltage VP2 and the horizontal axis is the bus current.

  Therefore, as shown in FIG. 6B, when the calculated value is equal to or greater than the predetermined value Io (that is, when the bus current is equal to or greater than Io ′), the potential VP2 of the electric circuit P2 is V1 as described above. The output current I1 of the DCDC converter 15 is selectively output to the DCAC converter 19, and the output current I2 of the DCDC converter 17 is not output. On the other hand, when the calculated value is less than the predetermined value Io (that is, when the bus current is less than Io ′), the potential VP2 of the electric circuit P2 becomes V2, as described above, and the output current I2 of the DCDC converter 17 is selected. Is output to the DCAC converter 19.

  FIG. 6B is a diagram showing the relationship between the output currents I1 and I2 and the bus current. The vertical axis represents the output currents I1 and I2, and the horizontal axis represents the bus current.

  Therefore, as shown in FIG. 6C, the discharge current of the storage battery 20 is always greater than or equal to a predetermined value Io when discharged. FIG. 6C is a diagram showing the relationship between the discharge current of the storage battery 20 and the bus current, where the vertical axis is the discharge current of the storage battery 20 and the horizontal axis is the bus current.

  The DCAC converter 19 receives the output current (direct current) of the DCDC converter 15 or 17 from the input end 19a, converts it into an alternating current, and outputs it from the output end 19b. The output voltage and output current of the DCAC converter 19 are expressed as effective values.

(Example of circuit configuration of DCDC converters 15 and 17)
FIG. 2 shows an example of the circuit configuration of the DCDC converter 15. Hereinafter, the circuit configuration and operation of the DCDC converter 15 will be described with reference to FIG.

  The DCDC converter 15 is, for example, a bidirectional DCDC converter, and includes a primary side circuit 80, a secondary side circuit 81, a transformer 82, and a control unit 83.

  The transformer 82 includes a core portion 82a that forms a magnetic path. Two primary coils L1, L2 and a secondary coil L3 are wound around the core portion 82a.

  The primary side circuit 80 includes a pair of terminals 15a (T1 and T2), switches SW1 to SW4, capacitors C1 and C2, two primary coils L1 and L2, and coils L4 and L5. . Each switch SW1-SW4 is a semiconductor switch, for example.

  One end of the switch SW1 is connected to one end of the switch SW4, and the other end of the switch SW1 is connected to one end of the primary coil L1 through the switch SW2. One end of the coil L4 is connected to a branch point N1 between the switches SW1 and SW2, and the other end of the coil L4 is connected to a branch point N2 between the switches SW1 and SW4 via a capacitor C1.

  As described above, one end of the switch SW4 is connected to one end of the switch SW1, and the other end of the switch SW4 is connected to one end of the primary coil L2 via the switch SW3. One end of the coil L5 is connected to the branch point N4 between the switches SW3 and SW4, and the other end of the coil L5 is connected to the branch point N3 via the capacitor C2. The branch point N3 is a branch point between the switch SW4 and the branch point N2.

  The other end of the primary coil L1 and the other end of the primary coil L2 are connected to each other. A branch point N5 between the primary coils L1 and L2 is connected to a branch point N6 between the branch points N2 and N3. A terminal T2 is connected to the branch point N6. A branch point N7 between the coil L4 and the capacitor C1 and a branch point N8 between the coil L5 and the capacitor C2 are connected to each other. A terminal T1 is connected to a branch point N9 between the branch points N7 and N8.

  The pair of terminals T1, T2 are connected to the storage battery 20 via the power line P1.

  The secondary side circuit 81 includes a pair of terminals 15b (T3, T4), switches SW5 to SW8, and a secondary coil L3. Each switch SW5-SW8 is a semiconductor switch, for example.

  The terminal T3 is commonly connected to one end of each of the switches SW5 and SW6. The terminal T4 is commonly connected to one end of each of the switches SW7 and SW8. The other ends of the switches SW5 and SW7 are connected to each other. The other ends of the switches SW6 and SW8 are connected to each other. A branch point N9 between the switches SW5 and SW7 is connected to one end of the secondary coil L3, and a branch point N10 between the switches SW6 and SW8 is connected to the other end of the secondary coil L3.

  The pair of terminals T3 and T4 are connected to the electric circuit P2.

  Although not shown in the drawings, each of the terminals T1 to T4 is provided with a voltage sensor that detects a voltage at each terminal and a current sensor that detects a current flowing through each terminal.

  The control unit 83 performs on / off control of the switches SW1 to SW8 based on the detection results of the voltage sensors and the current sensors, and performs on / off control of the switches SW1 to SW8 according to the control of the control unit 21. . As a result, the output voltage and output current of the DCDC converter 15 are controlled, for example, as set in FIGS.

  The DCDC converter 15 receives power from the terminals T1 and T2, boosts the voltage of the power by on / off control of the switches SW1 to SW8, and outputs the boosted voltage from the terminals T3 and T4. It is also possible to input power from the terminals T3 and T4, step down the voltage of the power by on / off control of the switches SW1 to SW8, and output the voltage from the terminals T1 and T2.

  Note that when the DCDC converter 15 boosts the power from the terminals T1 and T2 and outputs the boosted power from the terminals T3 and T4, for example, it operates as follows.

  (1) In the primary circuit 80, when the switch SW1 is turned on and the switches SW2 to SW4 are turned off, the coil L4 is magnetized by the voltage of the storage battery 20 from each of the terminals T1 and T2, and the coil L4 Magnetic energy is stored in

  (2) When the switches SW1, SW3, SW4 are turned off and the switch SW2 is turned on, in addition to the voltage of the storage battery 20 from the terminals T1, T2, the magnetic energy stored in the coil L4 is converted into electric energy. And is transmitted to the secondary circuit 81 side by the coils L1 and L3 (that is, the transformer 82) at a voltage higher than the voltage of the storage battery 20. In the secondary side circuit 81, when the switches SW5 and SW8 are turned on and the switches SW6 and SW7 are turned off, the power transmitted to the secondary side circuit 81 side is smoothed by a capacitor or the like (not shown), DC power is output from the electric circuit P2 side through the terminals T3 and T4. By changing the ON time of the switch SW1, the amount of magnetic energy stored in the coil L4 changes, and the output voltage (boost amount) from the terminals T3 and T4 of the DCDC converter 15 is controlled.

  Similarly, (3) in the primary side circuit 80, when the switch SW4 is turned on and the switches SW1 to SW3 are turned off, the coil L5 is magnetized by the voltage of the storage battery 20 from each terminal T1, T2, Magnetic energy is stored in the coil L5.

  (4) When the switches SW1, SW2 and SW4 are turned off and the switch SW3 is turned on, in addition to the voltage of the storage battery 20 from the terminals T1 and T2, the magnetic energy stored in the coil L5 is converted into electric energy. And is transmitted to the secondary circuit 81 by the coils L2 and L3 (that is, the transformer 82) at a voltage higher than the voltage of the storage battery 20. In the secondary side circuit 81, the switches SW6 and SW7 are turned on and the switches SW5 and SW8 are turned off, so that the power transmitted to the secondary side circuit 81 is smoothed by a capacitor (not shown). Thus, it is output as DC power to the electric circuit P2 side through the terminals T3 and T4.

  By alternately performing the above (2) and (4), the electric power from the storage battery 20 input to the terminals T1 and T2 is boosted and output from the terminals T3 and T4 to the electric circuit P2. The reason why the two coils L1 and L2 are used is to make it easy to increase the step-up width. Further, the above (1) may be performed during the operation of the above (4), and the above (3) may be performed during the operation of the above (2).

  Note that the configuration and operation of this DCDC converter are merely examples, and a general bidirectional DCDC converter can be used.

  The DCDC converter 17 is configured in the same manner as the DCDC converter 15.

(Operation)
Next, the operation of the in-home discharge control device 1 will be described based on FIG.

  In step S1, the in-home discharge control device 1 is activated. At the time of starting the in-home discharge control device 1, the DCDC converter 15 is not operated (that is, stopped) by the control unit 21, and the DCDC converter 17 and the DCAC converter 19 are operated. Thereby, the discharge current from the storage battery 5 is discharged to the home load 30 via the DCDC converter 17 and the DCAC converter 19. That is, power is supplied to the home load 30.

  Here, since the load power of the home load 30 is unknown when the home discharge control device 1 is activated, the DCDC converter 15 is stopped and the discharge current of the storage battery 5 is discharged to the home load 30. May be activated to discharge the discharge current of the storage battery 20 to the in-home load 30.

  In step S <b> 2, the load power of the home load 30 is detected by the power sensor 11. Further, the output voltage of the storage battery 20 is detected by the voltage sensor 9. The control unit 21 calculates the current value of the discharge current discharged from the storage battery 20 (= load power / output voltage of the storage battery 20) based on the detection results of the sensors 9 and 11, and the calculated value is predetermined. It is determined whether or not the value is greater than or equal to Io. Depending on the determination result, the controller 21 controls the operation / stop of the DCDC converter 15.

  In the present embodiment, the operation / stop of the DCDC converter 15 is controlled to be switched by the control unit 21 in accordance with the determination result, but the DCDC converter 17 and the DCAC converter 19 are connected to the home discharge control device 1. Is controlled by the control unit 21 so as to always operate.

  In step S3, if the calculated value is equal to or greater than the predetermined value Io as a result of the determination, the process proceeds to step S4. On the other hand, if the calculated value is less than the predetermined value Io, the process proceeds to step S5.

  In step S <b> 4, the DCDC converter 15 is operated by the control unit 21. That is, both DCDC converters 15 and 17 are in operation. When both of the DCDC converters 15 and 17 are in operation, the output current (I1 or I2) of the higher one of the output voltages V1 and V2 is selectively output to the DCAC converter 19 to the home load 30. Discharged.

  Here, during operation of both the DCDC converters 15 and 17, the output voltage V 1 of the DCDC converter 15 becomes higher than the output voltage V 2 of the DCDC converter 17, so the output current I 1 of the DCDC converter 15 (that is, the discharge current of the storage battery 20). ) Is selectively output to the DCAC converter 19 and discharged to the home load 30. That is, when the calculated value is equal to or greater than the predetermined value Io (that is, when the discharge current of the storage battery 20 is equal to or greater than the predetermined value Io), the discharge current of the storage battery 20 is discharged. Then, the process returns to step S2.

  In step S5, the DCDC converter 15 is stopped by the control unit 21. As a result, the output voltage V1 of the DCDC converter 15 becomes 0 (zero), and the output voltage V2 of the DCDC converter 17 becomes higher than the output voltage V1 of the DCDC converter 15, so that the output current I2 of the DCDC converter 17 (that is, The discharge current of the storage battery 20) is output to the DCAC converter 19 and discharged to the home load 30. That is, when the calculated value is less than the predetermined value Io (that is, when the discharge current of the storage battery 20 is less than the predetermined value Io), the storage battery 20 is not discharged and the discharge current of the storage battery 5 is discharged. Then, the process returns to step S2.

  In this way, the discharge current of the storage battery 20 is discharged only when the value becomes equal to or greater than the predetermined value Io.

  Next, based on FIG. 4, operation | movement of this household discharge control apparatus 1 is demonstrated.

  FIG. 4 is a diagram illustrating an example of fluctuations in the load power P of the home load 30. The vertical axis indicates the load power P, and the horizontal axis indicates time t. Note that Po in FIG. 4 is load power when the calculated value (= load power / output voltage of the storage battery 20) is a predetermined value Io.

  In each period Q1, Q3, Q5, since the load power P is less than Po, the calculated value is less than a predetermined value Io (that is, the bus current is less than Io '). Therefore, in each of these periods Q1, Q3, and Q5, as shown in FIG. 6B, the output current I1 is not output from the DCDC converter 15 (thus, not discharged from the storage battery 20), and from the DCDC converter 17, An output current I2 less than a predetermined value Io ′ corresponding to the load power P is output (thus, a discharge current corresponding to the load power P is discharged from the storage battery 5). Then, the output current I2 is discharged to the home load 30 through the DCAC converter 19. Thus, in each period Q1, Q3, Q5, the load power P is covered by the power Pb supplied by the discharge of the storage battery 5.

  In each of the periods Q2 and Q4, the load power P is equal to or greater than Po, and thus the calculated value is equal to or greater than a predetermined value Io (that is, the bus current is equal to or greater than Io '). Therefore, in each of these periods Q2 and Q4, as shown in FIG. 6B, the output current I2 is not output from the DCDC converter 17 (and therefore is not discharged from the storage battery 5), and the load power is output from the DCDC converter 15. An output current I1 equal to or greater than a predetermined value Io ′ corresponding to P is output (thus, a discharge current equal to or greater than a predetermined value Io is discharged from the storage battery 20). Then, the output current I1 is discharged to the home load 30 through the DCAC converter 19. Thus, in each of these periods Q2 and Q4, the load power P is covered by the power Pa supplied by the discharge of the storage battery 20.

  In this way, the discharge current of the storage battery 20 is discharged only when the value becomes equal to or greater than the predetermined value Io.

  In the first embodiment, when the remaining capacity of the storage battery 20 is less than a predetermined amount, the discharge of the storage battery 20 may be stopped (Modification 1). More specifically, for example, information on the remaining capacity of the storage battery 20 is transmitted from the control unit 24 of the vehicle K to the control unit 21 of the apparatus 1 wirelessly or by wire, and the control unit 21 determines the remaining capacity of the storage battery 20 based on the information. It is determined whether or not the capacity is less than a predetermined amount. As a result of the determination, if the remaining capacity of the storage battery 20 is less than the predetermined amount, the storage battery 20 is discharged even if the calculated value is equal to or greater than the predetermined value Io. It may be stopped (that is, the DCDC converter 15 is stopped). Thereby, it can prevent that the remaining capacity of the storage battery 20 becomes empty or becomes a small quantity which interferes with driving | operation.

  Further, in the first modification, when the AC system 40 is further used as in the in-home discharge control device 1G (FIG. 19) of the sixth embodiment described later, when the remaining capacity of the storage battery 20 is less than a predetermined amount, The storage battery 20 may be charged by the output current of the AC system 40.

  In addition, the power conditioner 3 of this embodiment prescribes | regulates "charging / discharging control of vehicles K, such as an electric vehicle," and does not prescribe | regulate all operation | movement of a power conditioner. The power conditioner 3 of this embodiment may be incorporated as a part of the power conditioner.

[Embodiment 2]
In the first embodiment, the storage battery 20 is discharged only when the calculated value of the discharge current of the storage battery 20 is equal to or greater than a predetermined value Io, and at that time, the current corresponding to the load power while maintaining the discharge current at a value equal to or greater than the predetermined value Io. However, in the present embodiment, the storage battery 20 is discharged only when the calculated value is equal to or greater than the predetermined value Io, and at that time, the discharge current is controlled to become the predetermined value Io. Let

  Furthermore, in the present embodiment, when the calculated value exceeds a predetermined value Io, the storage battery 5 is discharged so as to compensate for the shortage of the discharge current of the storage battery 20 in the load power.

  Hereinafter, based on FIG. 1, FIG. 7-FIG. 9, the in-home discharge control apparatus 1B which concerns on this Embodiment is explained in full detail. Note that the same members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the first embodiment will be mainly described.

(Constitution)
The DCDC converter 15B according to the present embodiment is stopped by the control unit 21 when the calculated value is less than the predetermined value Io, and is operated by the control unit 21 only when the calculated value is equal to or greater than the predetermined value Io. 20 discharge currents are output. At that time, for example, as shown in FIG. 7A, the DCDC converter 15B controls the output current I1 to be a predetermined value Io ′ and controls the output voltage V1 to Va ≦ V1 ≦ Vb. Io ′ is the output current I1 when the discharge current of the storage battery 20 is Io.

  More specifically, when the calculated value is the predetermined value Io, the DCDC converter 15B controls the output current I1 to the predetermined value Io ′ and the output voltage V1 to the voltage Va. When the calculated value exceeds the predetermined value Io, the converter 15B controls the output voltage V1 to a voltage Vc lower than the voltage Va while controlling the output current I1 to the predetermined value Io ′. The voltage Vc is equal to the upper limit voltage of the output voltage V2 of the DCDC converter 17B, as will be described later.

  The DCDC converter 17B of the present embodiment is configured similarly to the DCDC converter 17 of the first embodiment.

  FIG. 7B is a diagram showing an example of setting of the output voltage V2-output current I2 of the DCDC converter 17B. FIG. 7B shows, for example, that the upper limit current Id of the output current I2 of the DCDC converter 17B is set to a value larger than the upper limit current Ib of the output current I2 of the DCDC converter 17 (see FIG. 5C). This is the same as FIG. In the first embodiment, the output current I2 of the DCDC converter 17 takes only a value less than the predetermined value Io ′ (see FIG. 6A), but in the present embodiment, the output current I2 of the DCDC converter 17B. Flows more than in the case of the first embodiment. Therefore, as described above, the upper limit current Id is set larger than the upper limit current Ib.

  With this setting, as will be described later, the DCDC converter 17B interlocks with the operation of the DCDC converter 15B, and when the calculated value is less than the predetermined value Io, the discharge current of the storage battery 5 becomes a current corresponding to the load power. If the calculated value is a predetermined value Io, the storage battery 5 is not discharged. If the calculated value is larger than the predetermined value Io, the discharge current of the storage battery 5 is The output is made up to compensate for the shortage in the output current I1 of the DCDC converter.

  In this in-home discharge control device 18, how much current is output from which DCDC converter 15 B, 17 B is determined as follows depending on the setting of the above output voltage-output current.

  As shown in FIG. 8A, when the calculated value is less than the predetermined value Io (that is, when the bus current flowing through the electric circuit P2 (that is, the current of at least one of I1 and I2) is less than Io ′), The voltage VP2 of the electric circuit P2 is the same voltage as the output voltage V2 (= Vc) of the converter 17B, as in the case of the first embodiment. Further, when the calculated value is a predetermined value Io (that is, when the bus current is Io ′), Va> Vc, so that the output voltage V1 (= Va) of the DCDC converter 15B is the output voltage V2 of the DCDC converter 17B. Since it becomes higher than (= Vc), the voltage VP2 of the electric circuit P2 becomes V1 (= Va). When the calculated value exceeds the predetermined value Io (that is, when the bus current exceeds Io ′), as described above, the output voltage V1 of the DCDC converter 15B reaches the output voltage V2 (= Vc) of the DCDC converter 17B. Since the voltage decreases, the voltage VP2 of the electric circuit P2 becomes V1 (= V2 = Vc).

  Therefore, as shown in FIG. 8B, when the calculated value is less than the predetermined value Io (that is, when the bus current is less than Io ′), the voltage VP2 of the electric circuit P2 is V2 as described above. The output current I2 of the DCDC converter 17B (that is, the discharge current of the storage battery 5) is selectively output to the DCAC converter 19, and the output current I1 of the DCDC converter 15B (that is, the discharge current of the storage battery 20) is not output. Further, when the calculated value is the predetermined value Io (that is, when the bus current is Io ′), as described above, the voltage VP2 of the electric circuit P2 becomes V1, so that the output current I1 of the DCDC converter 15B is selectively selected. It is output to the DCAC converter 19 and the output current I2 of the DCDC converter 17B is not output.

  When the calculated value exceeds the predetermined value Io (that is, when the bus current exceeds Io ′), the voltage VP2 of the electric circuit P2 becomes V1 (= V2 = Vc), so both DCDC converters 15B and 17B. Output currents I1 and I2 are output. That is, an output current I1 controlled to a predetermined value Io ′ is output from the DCDC converter 15B (that is, a discharge current of the predetermined value Io is discharged from the storage battery 20), and among the load power from the DCDC converter 17B, The output current I2 is output so as to compensate for the shortage of the output current I1 (that is, the discharge current is discharged from the storage battery 5 so as to compensate for the shortage of the discharge current of the storage battery 20 in the load power. ).

  Therefore, as shown in FIG. 8C, the discharge current of the storage battery 20 is always a predetermined value Io when discharged. In addition, FIG.8 (c) is the figure which showed the relationship between the discharge current of the storage battery 20, and the said bus current, a vertical axis | shaft is the discharge current of the storage battery 20, and a horizontal axis is the said bus current.

(Operation)
FIG. 9 is a diagram illustrating an example of fluctuations in the load power P of the home load 30. The vertical axis indicates the load power P, and the horizontal axis indicates time t. Note that Po in FIG. 9 is load power when the calculated value (= load power / output voltage of the storage battery 20) is a predetermined value Io.

  In each period Q1, Q3, Q5, since the load power P is less than Po, the calculated value is less than a predetermined value Io (that is, the bus current is less than Io '). Therefore, in each of these periods Q1, Q3, and Q5, as shown in FIG. 8B, the output current I1 is not output from the DCDC converter 15B (thus, not discharged from the storage battery 20), and from the DCDC converter 17B, An output current I2 less than a predetermined value Io ′ corresponding to the load power P is output (thus, a discharge current corresponding to the load power P is discharged from the storage battery 5). Then, the output current I2 is discharged to the home load 30 through the DCAC converter 19. Thus, in each period Q1, Q3, Q5, the load power P is covered by the power Pb supplied by the discharge of the storage battery 5.

  In each period Q2, Q4, since the load power P becomes larger than Po, the calculated value becomes larger than a predetermined value Io (that is, the bus current becomes larger than Io '). Therefore. In each of these periods Q2 and Q4, as shown in FIG. 8B, an output current I1 having a predetermined value Io ′ is output from the DCDC converter 15B (thus, a discharge current having a predetermined value Io is discharged from the storage battery 20). The output current I1 is discharged to the home load 30 through the DCAC converter 19.

  In parallel with this, an output current I2 is output from the DCDC converter 17B so as to compensate for the shortage of the output current I1 in the load power P (therefore, the storage battery 5 discharges the discharge current of the storage battery 20 in the load power P). The output current I2 is discharged to the home load 30 via the DCAC converter 19 so as to make up for the shortage.

  Thus, in each of these periods Q2 and Q4, the load power P is covered by the power Pa (= Po) supplied by the discharge of the storage battery 20 and the power Pb supplied by the discharge of the storage battery 5.

  Although not shown, when the load power P is Po, the calculated value is a predetermined value Io (that is, the bus current is Io ′). Therefore, in this case, as shown in FIG. 8B, the output current I2 is not output from the DCDC converter 17B (and therefore is not discharged from the storage battery 5), and the output current of the predetermined value Io ′ is output from the DCDC converter 15B. I1 is output (therefore, a discharge current of a predetermined value Io is discharged from the storage battery 20), and the output current I1 is discharged to the home load 30 via the DCAC converter 19. Thus, in this case, the load power P is covered by the power Pa (= Po) supplied by the discharge of the storage battery 20.

  Thus, during the discharge of the storage battery 20 (periods Q2 and Q4 and the case where the above illustration is omitted), the discharge current of the storage battery 20 becomes the predetermined value Io.

[Embodiment 3]
In the first embodiment, only when the calculated value of the discharge current of the storage battery 20 is equal to or greater than a predetermined value Io (first predetermined value), the discharge current of the storage battery 20 corresponds to the load power while maintaining a value equal to or greater than the predetermined value Io. In this embodiment, the discharge current of the storage battery 20 is further set to a predetermined value Is ′ (not shown, a second predetermined value) larger than the predetermined value Io in the present embodiment. The discharge is controlled so as not to exceed.

  Hereinafter, based on FIG. 1, FIG. 10 to FIG. 12, the in-home discharge control device 1C according to the present embodiment will be described in detail. Note that the same members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the first embodiment will be mainly described.

(Constitution)
The DCDC converter 15C according to the present embodiment is stopped by the control unit 21 when the calculated value is less than the predetermined value Io, and is operated by the control unit 21 only when the calculated value is equal to or greater than the predetermined value Io. 20 discharge currents are output.

  At this time, the relationship between the output voltage V1 and the output current I1 of the DCDC converter 15C is set, for example, as shown in FIG. That is, when the output current I1 is Io ′ ≦ I1 ≦ Is, the output voltage V1 becomes V1 = Va. When the output current I1 reaches the predetermined value Is, the output voltage V1 is a value within the range of Vb ≦ V1 ≦ Va. (Here, V1 = Vc). Here, Io ′ is the value of the output current I1 when the discharge current of the storage battery 20 is Io, and Is is the value of the output current I1 when the discharge current of the storage battery 20 is Is ′.

  With this setting, when the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′, the DCDC converter 15C controls the output voltage V1 to the upper limit voltage Va and sets the output current I1 to Io ′ ≦ I1 ≦. It outputs so that it may become the electric current according to load electric power in the range of Is. When the calculated value exceeds the predetermined value Is, the DCDC converter 15C controls the output current I1 to the predetermined value Is' and controls the output voltage V1 to a voltage Vc lower than the upper limit voltage Va. The voltage Vc is equal to the upper limit voltage of the output voltage V2 of the DCDC converter 17C, as will be described later.

  The DCDC converter 17C of the present embodiment is configured similarly to the DCDC converter 17 of the first embodiment.

  FIG. 10B is a diagram showing an example of setting of the output voltage V2-output current I2 of the DCDC converter 17C. FIG. 10B is the same as FIG.

  With this setting, as described later, the DCDC converter 17C operates in conjunction with the operation of the DCDC converter 17C. When the calculated value is less than the predetermined value Io, the discharge of the storage battery 5 is performed as in the first embodiment. When the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′, the storage battery 5 is not discharged and the calculated value is predetermined. When it is larger than the value Is ′, the discharge current of the storage battery 5 is output so as to compensate for the shortage of the output current I1 of the DCDC converter in the load power.

  In this in-home discharge control apparatus 1C, how much current is output from which DCDC converter 15C, 17C is determined as follows depending on the setting of the above output voltage-output current.

  As shown in FIG. 11A, when the calculated value is less than the predetermined value Io (that is, when the bus current flowing through the electric circuit P2 (that is, the current of at least one of I1 or I2) is less than Io ′), The voltage VP2 of the electric circuit P2 is the same voltage as the output voltage VP2 (= Vc) of the DCDC converter 17C, as in the case of the first embodiment. When the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′ (that is, if the bus current is not less than Io ′ and not more than Is), Va> Vc, so that the output voltage V1 (= Va) of the DCDC converter 15C. Since becomes higher than the output voltage V2 (= Vc) of the DCDC converter 17C, the voltage VP2 of the electric circuit P2 becomes V1 (= Va). When the calculated value exceeds the predetermined value Is ′ (that is, when the bus current exceeds Is), as described above, the output voltage V1 of the DCDC converter 15C reaches the output voltage V2 (= Vc) of the DCDC converter 17C. Since the voltage decreases, the voltage VP2 of the electric circuit P2 becomes V1 (= V2 = Vc).

  Accordingly, as shown in FIG. 11B, when the calculated value is less than the predetermined value Io (that is, when the bus current is less than Io ′), as described above, the voltage VP2 of the electric circuit P2 becomes V2. The output current I2 of the DCDC converter 17C (that is, the discharge current of the storage battery 5) is selectively output to the DCAC converter 19, and the output current I1 of the DCDC converter 15C (that is, the discharge current of the storage battery 20) is not output. When the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′ (that is, when the bus current is not less than Io ′ and not more than Is), the voltage VP2 of the electric circuit P2 is V1 as described above. The output current I1 of the converter 15B is selectively output to the DCAC converter 19, and the output current I2 of the DCDC converter 17B is not output.

  When the calculated value exceeds the predetermined value Is ′ (that is, when the bus current exceeds Is), the voltage VP2 of the electric circuit P2 becomes V1 (= V2 = Vc), and therefore both DCDC converters 15C and 17C. Output currents I1 and I2 are output. That is, the DCDC converter 15C outputs the output current I1 controlled to the predetermined value Is (that is, the discharge current of the predetermined value Io is discharged from the storage battery 20), and the DCDC converter 17C outputs the load power of The output current I2 is output so as to make up for the shortage in the output current I1 (that is, the discharge current is discharged from the storage battery 5 so as to make up for the shortage in the discharge current of the storage battery 20 in the load power). .

  Therefore, as shown in FIG. 11 (c), the discharge current of the storage battery 20 is always greater than or equal to the predetermined value Io when discharged (more specifically, between the predetermined value Io and the predetermined value Is ′). fluctuate). In addition, FIG.11 (c) is the figure which showed the relationship between the discharge current of the storage battery 20, and the said bus current, a vertical axis | shaft is the discharge current of the storage battery 20, and a horizontal axis is the said bus current.

(Operation)
FIG. 12 is a diagram illustrating an example of fluctuations in the load power P of the home load 30. The vertical axis indicates the load power P, and the horizontal axis indicates time t. Note that Po in FIG. 9 is load power when the calculated value (= load power / output voltage of the storage battery 20) is a predetermined value Io, and Ps is when the calculated value is a predetermined value Is ′ (ie, Load power when the bus current is a predetermined value Is).

  In each period Q1, Q3, Q5, since the load power P is less than Po, the calculated value is less than a predetermined value Io (that is, the bus current is less than Io '). Therefore, in each of these periods Q1, Q3, and Q5, as shown in FIG. 11B, the output current I1 is not output from the DCDC converter 15C (thus, not discharged from the storage battery 20), and from the DCDC converter 17C, An output current I2 less than a predetermined value Io ′ corresponding to the load power P is output (thus, a discharge current corresponding to the load power P is discharged from the storage battery 5). Then, the output current I2 is discharged to the home load 30 through the DCAC converter 19. Thus, in each period Q1, Q3, Q5, the load power P is covered by the power Pb supplied by the discharge of the storage battery 5.

  In the period Q2, since the load power P becomes larger than Ps, the calculated value becomes larger than the predetermined value Is' (that is, the bus current becomes larger than Is). Therefore. In this period Q2, as shown in FIG. 11 (b), the DCDC converter 15C outputs the output current I1 of the predetermined value Is (therefore, the discharge current of the predetermined value Is ′ is discharged from the storage battery 20), and its output The current I1 is discharged to the home load 30 through the DCAC converter 19.

  In parallel with this, the DCDC converter 17C outputs the output current I2 so as to compensate for the shortage of the output current I1 in the load power P (therefore, the storage battery 5 lacks the output current I1 of the load power P). The discharge current is discharged so as to compensate for this), and the output current I2 is discharged to the home load 30 via the DCAC converter 19.

  Thus, in this period Q2, the load power P is covered by the power Pa (= Ps) supplied by the discharge of the storage battery 20 and the power Pb supplied by the discharge of the storage battery 5.

  In the period Q4, since the load power P is Po ≦ P ≦ Ps, the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′ (that is, the bus current is not less than Io ′ and not more than Is). Therefore, in this period Q4, as shown in FIG. 11 (b), the output current I2 is not output from the DCDC converter 17C (and therefore is not discharged from the storage battery 5), and Io ′ ≦ I1 ≦ from the DCDC converter 15C. The output current I1 corresponding to the load power P is output within the range of Is (therefore, the discharge current corresponding to the load power P is discharged from the storage battery 20 within the range of Io ≦ I1 ≦ Is ′). I1 is discharged to the home load 30 via the DCAC converter 19. Thus, in this period Q4, the load power P is covered by the power Pa supplied by the discharge of the storage battery 20.

  Thus, during the discharge of the storage battery 20 (periods Q2, Q4), the discharge current of the storage battery 20 becomes equal to or greater than the predetermined value Io (more specifically, varies between the predetermined value Io and the predetermined value Is').

[Embodiment 4]
In this embodiment, an AC (alternating current) system that supplies AC power is used in place of the stationary storage battery 5 in the third embodiment.

  Hereinafter, based on FIGS. 13-16, it explains in full detail about in-home discharge control apparatus 1D which concerns on this Embodiment. Note that the same members as those in the third embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the third embodiment will be mainly described.

(Constitution)
As shown in FIG. 13, the in-home discharge control device 1D is identical to the in-home discharge control device 1C (see FIG. 1) of Embodiment 3 in that the stationary storage battery 5 and the DCDC converter 17C are omitted, and the AC system The difference is that 40 is connected to the power line P3.

  Further, the DCAC converter 19D (third discharge control unit) of the present embodiment further outputs the output current I3 and the output current I4 of the AC system 40 in the DCAC converter 19 (see FIG. 1) of the third embodiment. The power line P3 is selectively output.

  The relationship between the output voltage V3 and the output current I3 of the DCAC converter 19D at the time of output is set as shown in FIG. That is, when the output current I3 is Io ′ ≦ I3 <Is, the output voltage V3 becomes the voltage Vf. When the output current I3 reaches the predetermined value Is, the output voltage V3 is a value in the range of 0 ≦ V3 ≦ Vf (here Then Ve).

  With this setting, the DCAC converter 19D causes the calculated value to be greater than or equal to the predetermined value Io and less than the predetermined value Is ′ (that is, when the load current flowing through the electric circuit P3 (that is, the output current I3) is greater than or equal to Io ′ and less than Is). The output voltage V3 is controlled to the voltage Vf, and the output current I1 of the DCDC converter 15C is input and output as the output current I3.

  When the calculated value exceeds the predetermined value Is ′ (that is, when the load current exceeds Is), the DCAC converter 19D controls the output voltage V3 to a voltage Ve lower than the voltage Vf, and the DCDC converter 19D The output current I1 of 15C is input and the output current I3 is output. The voltage Ve is equal to the upper limit voltage of the output voltage V4 of the commercial power system 40.

  When the calculated value is less than the predetermined value Io (that is, when the load current is less than Io ′), the DCAC converter 19D is stopped together with the DCDC converter 15C by the control unit 21, and the output voltage V3 is 0 ( Zero).

  The AC system 40 is, for example, a commercial power system that supplies AC power. The output voltage V4-output current I4 of the AC system 40 is set as shown in FIG. That is, when the output current I4 is less than the current Ie, the output voltage V4 becomes the voltage Ve, and when the output current I4 is the current Ie, the output voltage V4 becomes a value less than the voltage Ve. The current Ie is a value larger than the predetermined value Is.

  With this setting, the AC system 40 outputs the output when the calculated value is less than the predetermined value Io (that is, when the load current is less than Io ′) in conjunction with the operation of the DCAC converter 19D, as will be described later. When the calculated value is equal to or greater than the predetermined value Io and equal to or less than the predetermined value Is ′ (that is, when the load current is equal to or greater than Io ′ and equal to or less than Is), the output current I4 is output to the power line P3. When the calculated value is larger than the predetermined value Is ′ (that is, when the load current is larger than Is), the output power I3 of the load power is compensated for the shortage. The output current I4 is output to the power line P3.

  In this in-home discharge control apparatus 1D, how much current is output from either the DCAC converter 19D or the AC system 40 is determined as follows depending on the setting of the above output voltage-output current.

  As shown in FIG. 15A, when the calculated value is less than a predetermined value Io (that is, when the load current is less than Io ′), the output voltage V4 of the DCDC converter 19D is zero (see FIG. 14A). Therefore, the voltage VP3 of the power line P3 becomes the same voltage as the output voltage V4 (= Ve) of the AC system 40. When the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′ (that is, when the load current is not less than Io ′ and not more than Is), since Vf> Ve, the output voltage V3 (= Vf) of the DCDA converter 19D. ) Becomes higher than the output voltage V4 (= Ve) of the AC system 40, and the voltage VP3 of the power line P3 becomes V3 (= Vf). When the calculated value exceeds the predetermined value Is ′ (that is, when the load current exceeds Is), the output voltage V3 of the DCAC converter 19D reaches the output voltage V4 (= Ve) of the AC system 40 as described above. Since the voltage decreases, the voltage VP3 of the power line P3 becomes V4 (= V3 = Ve).

  Therefore, as shown in FIG. 15B, when the calculated value is less than the predetermined value Io (that is, when the load current is less than Io ′), as described above, the voltage VP3 of the power line P3 is V4 (= Ve). Therefore, the output current I4 of the AC system 40 is selectively output to the power line P3, and the output current I3 of the DCAC converter 19D (that is, the discharge current of the storage battery 20) is not output.

  When the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′ (that is, when the load current is not less than Io ′ and not more than Is), the voltage VP3 of the power line P3 is V3 (= Vf) as described above. Therefore, the output current I3 of the DCAC converter 19D is selectively output to the power line P3, and the output current I4 of the AC system 40 is not output to the power line P3.

  When the calculated value exceeds the predetermined value Is ′ (that is, when the load current exceeds Is), as described above, the voltage VP3 of the power line P3 becomes V3 (= V4 = Ve). In addition, an output current I3 having a predetermined value Is is output from the DCAC converter 19D to the power line P3, and the output current I4 is supplied from the AC system 40 to the power line P3 so as to compensate for the shortage of the output current I3 in the load power. Is output.

  Therefore, as shown in FIG. 15C, the discharge current of the storage battery 20 is always greater than or equal to a predetermined value Io when discharged. FIG. 15C is a diagram showing the relationship between the discharge current of the storage battery 20 and the load current, the vertical axis is the discharge current of the storage battery 20, and the horizontal axis is the load current.

(Operation)
FIG. 16 is a diagram illustrating an example of fluctuations in the load power P of the home load 30. The vertical axis indicates the load power P, and the horizontal axis indicates time t. Note that Po in FIG. 16 is load power when the calculated value is a predetermined value Io (that is, when the load current is Io ′), and Ps is when the calculated value is a predetermined value Is ′ (that is, Load power when the load current is Is).

  In each period Q1, Q3, Q5, since the load power P is less than Po, the calculated value is less than the predetermined value Io (that is, the load current is less than the predetermined value Io '). Therefore, in each of these periods Q1, Q3, and Q5, as shown in FIG. 15B, the output current I3 is not output from the DCAC converter 19D (thus, not discharged from the storage battery 20), and from the AC system 40, An output current I4 less than a predetermined value Io ′ corresponding to the load power P is output. Then, the output current I4 is discharged to the home load 30 via the power line P3. Thus, in each period Q1, Q3, Q5, the load power P is covered by the power Pc supplied by the AC system 40.

  In the period Q2, since the load power P becomes larger than Ps, the calculated value becomes larger than the predetermined value Is' (that is, the load current becomes larger than the predetermined value Is). Therefore. In this period Q2, as shown in FIG. 15 (b), the DCAC converter 19D outputs the output current I3 of the predetermined value Is (therefore, the discharge current of the predetermined value Is ′ is discharged from the storage battery 20), and its output The current I3 is discharged to the home load 30 via the power line P3.

  In parallel with this, an output current I4 is output from the AC system 40 so as to compensate for the shortage of the output current I3 in the load power P, and the output current I4 is also discharged to the home load 30 via the power line P3. The

  Thus, in this period Q2, the load power P is covered by the power Pa (= Ps) supplied by the discharge of the storage battery 20 and the power Pc supplied by the AC system 40.

  In the period Q4, since the load power P is Po ≦ P ≦ Ps, the calculated value is not less than the predetermined value Io and not more than the predetermined value Is ′ (that is, the load current is not less than Io ′ and not more than Is). Therefore, in this period Q4, as shown in FIG. 15B, the output current I4 is not output from the AC system 40, and the DCAC converter 19D responds to the load power P within the range of Io ′ ≦ I3 ≦ Is. The output current I3 is output (therefore, the discharge current corresponding to the load power P is discharged from the storage battery 20 within the range of the predetermined value Io and the predetermined value Is ′), and the output current I3 is transmitted to the home via the power line P3. The load 30 is discharged. Thus, in this period Q4, the load power P is covered by the power Pa supplied by the discharge of the storage battery 20.

  Thus, during the discharge of the storage battery 20 (periods Q2, Q4), the discharge current of the storage battery 20 becomes a current equal to or greater than the predetermined value Io.

[Embodiment 5]
In the second embodiment, the discharge current is controlled from the storage battery 20 to the predetermined value Io only when the calculated value of the discharge current of the storage battery 20 is equal to or greater than the predetermined value Io. Regardless of the load power, the discharge current of the storage battery 20 is always controlled to a predetermined value Io and discharged.

  Furthermore, in the present embodiment, when the load power exceeds a predetermined value Po, the storage battery 5 is discharged so as to compensate for the shortage of the discharge current of the storage battery 20 in the load power. Further, when the load power is less than the predetermined value Po, the storage battery 5 is charged with the surplus that is not consumed by the load power in the discharge current of the storage battery 20. The Po is electric power supplied by the discharge current of the predetermined value Io from the storage battery 20.

  Hereinafter, based on FIG. 1 and FIG. 17, the residential discharge control apparatus 1E according to the present embodiment will be described in detail. Note that the same members as those in the second embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the first embodiment will be mainly described.

  The DCDC converter 15E (first discharge control unit) of the present embodiment is configured similarly to the DCDC converter 15B of the second embodiment, as shown in FIG. The DCDC converter 15 </ b> E is always operated by the control unit 21, so that the discharge current of the storage battery 20 is always controlled to a predetermined value Io and output to the DCAC converter 19.

  The DCDC converter 17E (second discharge control unit) of the present embodiment is provided with the function of charging the storage battery 5 with the output current I1 of the DCDC converter 15E in the DCDC converter 15B of the second embodiment. In this embodiment, the control unit 21 (determination unit) determines the magnitude relationship between the load power detected by the power sensor 11 and the predetermined value Po. Then, based on the determination result, the DCDC converter 17E is controlled by the control unit 21 as follows.

  That is, the DCDC converter 17E charges the storage battery 5 with the excess of the output current I1 of the DCDC converter 15E that is not consumed by the load power when the load power is less than the predetermined value Po under the control of the control unit 21. For example, the DCDC converter 17E receives the surplus of the output current I1 of the DCDC converter 15E from the output terminal 17b, controls the voltage of the input terminal 15a to a voltage higher than the output voltage of the storage battery 20, and the input terminal The surplus of the output current I1 is output from 17a to the storage battery 5. Thereby, the storage battery 5 is charged with the surplus of the output current I1 of the DCDC converter 15E.

  In addition, when the load power is greater than the predetermined value Po under the control of the control unit 21, the DCDC converter 17E receives a DCDC converter from the output terminal 17b from the output terminal 17b as in the case of the second embodiment. The output current I2 (that is, the discharge current of the storage battery 5) is output so as to compensate for the shortage of the output current I1 of 15E.

  Further, the DCDC converter 17E stops charging / discharging of the storage battery 5 under the control of the control unit 21 when the load power is a predetermined value Po.

(Operation)
Next, based on FIG. 17, operation | movement of this household discharge control apparatus 1E is demonstrated.

  FIG. 17 is a diagram illustrating an example of fluctuations in the load power P of the home load 30. The vertical axis indicates the load power P, and the horizontal axis indicates time t. In addition, Po in FIG. 17 is electric power supplied by the output current (that is, current of a predetermined value Io ′) I1 of the DCDC converter 15E. The above Io 'is the output current I1 when the discharge current of the storage battery 20 is Io.

  In each of the periods Q1, Q3, and Q5, the load power P is less than Po. Therefore, as described above, the DCDC converter 17E uses the remaining amount of the output current I1 of the DCDC converter 15E that is not consumed by the load power P as the storage battery 5. To discharge. Thereby, surplus Pd exceeding load electric power P among electric power Po supplied by DCDC converter 15E is charged in storage battery 5.

  In each of the periods Q2 and Q4, the load power P is larger than Po, so that the DCDC converter 17E outputs the load power P so as to compensate for the shortage of the output current I1 of the DCDC converter 15E. The current I2 (that is, the discharge current of the storage battery 5) is output to the DCAC converter 19. As a result, the portion Pe of the load power P that is insufficient with the power Po is compensated by the discharge of the storage battery 5.

  Although not shown, when the load power P is Po, as described above, the DCDC converter 17E does not output the discharge current of the storage battery 5 to the DCAC converter 19 and outputs the output current I1 of the DCDC converter 15E. The battery 5 is neither output nor charged. Thus, in this case, the load power P is covered only by the power Po by the output current I1 (= Io ') of the DCDC converter 15E.

  In the present embodiment, when charging the storage battery 5, it is desirable to charge the battery 5 so as not to be fully charged.

  Moreover, in this Embodiment, when the remaining capacity of the storage battery 5 is large (namely, when it is more than predetermined amount), the discharge of the storage battery 20 may be stopped and the storage battery 5 may be discharged instead. In this case, the power conditioner 3 further includes a detection unit that detects the remaining capacity of the storage battery 5. In the control unit 21, whether or not the remaining capacity of the storage battery 5 is greater than or equal to a predetermined amount based on the detection result of the detection unit. When the remaining capacity of the storage battery 5 is greater than or equal to a predetermined amount, the storage battery 5 may be discharged by stopping the DCDC converter 15E without operating it.

  Moreover, in this Embodiment, when load electric power is small for the predetermined time or more, you may stop discharge of the storage battery 20. FIG. In this case, the control unit 21 measures the time when the load power is smaller than the predetermined power, determines whether or not the measured time is equal to or longer than the predetermined time, and as a result of the determination, the measured time is the predetermined time. In the above case, the DCDC converter 15E may be stopped.

[Embodiment 6]
Although Embodiment 1-5 demonstrated the case where the residential load 30 was AC load (load which operate | moves with alternating current power) 30a, even if the residential load 30 is DC load (load which operate | moves with direct current power), it is. Or may include both DC and AC loads.

  Hereinafter, an example of the home discharge control apparatus when the home load 30 is a DC load or includes both a DC load and an AC load will be described.

  FIG. 18 is an example of a home discharge control device when the home load 30 is a DC load 30b. 18 is different from Embodiment 1 (see FIG. 1) in that the residential load 30 is changed to the DC load 30b, and the DCAC converter 19 is omitted, and each DCDC converter 15 , 17 output currents I1, I2 are configured in the same manner except that they are directly output to the home load 30 via the power line P3.

  With this configuration, even when the in-house load 30 is the DC load 30b, power can be supplied in the same manner as when the in-house load 30 is the AC load 30a.

  FIG. 19 is another example of the home discharge control device when the home load 30 is a DC load 30b. The in-home discharge control device 1G in FIG. 19 is configured similarly to the in-home discharge control device 1F in FIG. 18 except that the AC system 40 is connected to the electric circuit P2 via the ACDC converter 50.

  The ACDC converter 50 converts an alternating current from the AC system 40 into a direct current and outputs the direct current to the electric circuit P2. The setting of the output voltage-output current of the ACDC converter 50 is set to the same setting as the setting of the output voltage-output current of the DCDC converter 17, for example. Thereby, the output / stop timing of the output current of the ACDC converter 50 can be synchronized with the output / stop timing of the output current of the DCDC converter 17.

  If the settings of the converters 50 and 17 are the same as described above, the operation may become unstable depending on which of the converters 15 and 17 is output. For this reason, it is desirable to set one of the converters 50 and 17 to be higher than the other setting so that the output is given priority (for example, depending on the situation, the ACDC conductor 15 may be given priority for output or the DCDC conductor may be output). 17 is given priority for output). Thereby, operation | movement can be stabilized.

  With this configuration, when the discharge current of the storage battery 5 is discharged to the home load 30, the output current of the AC system 40 is also discharged to the home load 30, so when the remaining capacity of the storage battery 5 is insufficient, the shortage Can be supplemented by the output current of the AC system 40.

  Note that the storage battery 5 and the DCDC converter 17 may be omitted in the in-home discharge control device 1G.

  FIG. 20 is an example of a home discharge control device when the home load 30 includes both an AC load 30a and a DC load 30b. 20 is different from the in-house discharge control device 1 of Embodiment 1 (see FIG. 1) in that the in-home load 30 includes both the AC load 30a and the DC load 30b. A point connected to the output end 19b of the DCAC converter 19 via the switch SW, a point connected to the ACDC converter 45 between the output end 19b of the DCAC converter 19 and the electric circuit P2, and a point further including the power sensor 12. The configuration is the same except that is different.

  The AC load 30a is connected to the output end 19b of the DCAC converter 19 via the electric circuit P3. Moreover, the DC load 30b is connected to the electric circuit P2 via the power line P4.

  The power sensor 12 is disposed on the power line P4, for example, and detects the load power of the DC load 30b. In this in-home discharge control device 1H, the load power of the home load 30 is the sum of the load power of the AC load 30a detected by the power sensor 11 and the load power of the DC load 30b detected by the power sensor 12. is there.

  The ACDC converter 45 converts the output current (alternating current) of the AC system 40 into a direct current and outputs it to the DC load 30b via the power line P4. The setting of the output voltage-output current of the ACDC converter 45 is set to the same setting as the setting of the output voltage-output current of the DCDC converter 17, for example. Thereby, the output / stop timing of the output current of the ACDC converter 45 can be synchronized with the output / stop timing of the output current of the DCDC converter 17.

  If the settings of the converters 45 and 17 are the same as described above, the operation may become unstable depending on which of the converters 45 and 17 is output. For this reason, it is desirable that one of the converters 45 and 17 is set to have higher priority than the other setting so that the output is given priority (for example, depending on the situation, the ACDC conductor 45 may be preferentially output or the DCDC conductor may be output. 17 is given priority for output). Thereby, operation | movement can be stabilized.

  The switch SW switches on / off the output of the output current of the AC system 40 to the power conditioner 3. For example, when the calculated value of the discharge current of the storage battery 20 (see Embodiment 1) is less than the predetermined value Io (that is, the storage battery 20 is not discharged and the storage battery 5 is discharged) by the control unit 21. ) Is turned on, and is turned off when the calculated value is equal to or greater than the predetermined value Io (that is, when the storage battery 5 is not discharged and the storage battery 20 is discharged).

  Compared with the operation of the first embodiment, the operation of the home discharge control device 1H is such that the discharge current of the storage battery 5 is discharged to the AC load 30a via the units 17, 19, and P3 and the units 17, P2, and P4. The point that the DC load 30b is discharged via the AC, the point that the output current of the AC system 40 is output in synchronization with the discharge of the storage battery 5, the output current of the AC system 40 is the AC load via each part SW, P3 The point discharged to 30a and also discharged to the DC load 30b via each part SW, 45, P4 and the discharge current of the storage battery 20 are output to the AC load 30a via each part P2, 19, P3. At the same time, it is the same except that it is also output to the DC load 30b via the electric circuit P4.

  With this configuration, even when the home load 30 includes both the AC load 30a and the DC load 30b, if the remaining capacity of the storage battery 5 is insufficient, the shortage can be compensated for by the output current of the AC system 40.

  In this in-home discharge control device 1H, on / off switching of the switch SW may be performed in accordance with the remaining capacity of the storage battery 5, for example. For example, the switch SW may be turned on and the output current of the AC system 40 may be output to the home load 30 only when the remaining capacity of the storage battery 5 is small. In this case, the power conditioner 3 further includes a detection unit that detects the remaining capacity of the storage battery 5. In the control unit 21, whether or not the remaining capacity of the storage battery 5 is less than a predetermined amount based on the detection result of the detection unit. The switch SW may be turned on in synchronization with the discharge of the storage battery 5 only when the remaining capacity of the storage battery 5 is less than a predetermined amount as a result of the determination. Thereby, the output current of the AC system 40 can be used only when the remaining capacity of the storage battery 5 is small.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments can be obtained by appropriately combining technical means disclosed in different embodiments. The form is also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a home discharge control device that uses an external storage battery for at least a part of the power consumption of a home load.

1, 1B, 1C, 1D, 1E, 1F, 1G, 1H Home discharge control device 20 Storage battery (external storage battery)
9 Voltage sensor (first detector)
11 Power sensor (second detection unit)
15, 15B, 15C, 15E DCDC converter (first discharge control unit)
17, 17B, 17C, 17E DCDC converter (second discharge control unit)
19 DCAC converter (third discharge controller)
20 Storage battery (stationary storage battery)
21 Control unit (calculation unit)
30 Residential load 40 AC system (commercial power system)
K vehicle

Claims (16)

A home discharge control device that is detachably connected to a predetermined external storage battery and controls discharge from the external storage battery to a home load,
A first detector for detecting an output voltage of the external storage battery;
A second detector for detecting load power of the residential load;
A calculation unit for calculating a calculated value of the first discharge current discharged from the external storage battery from the output voltage detected by the first detection unit and the load power detected by the second detection unit;
A first discharge control unit for controlling discharge of the first discharge current from the external storage battery in order to supply electric power to the home load;
With
The home discharge control device, wherein the first discharge control unit discharges the first discharge current to the home load when the calculated value is equal to or greater than a first predetermined value.   The in-home discharge control device according to claim 1, wherein the external storage battery is a storage battery mounted on a vehicle.   When the calculated value is equal to or greater than the first predetermined value, the first discharge control unit is configured to obtain a current corresponding to the load power while maintaining the first discharge current equal to or greater than the first predetermined value. The in-house discharge control device according to claim 1, wherein the in-house load is controlled to discharge to the in-house load.   The first discharge control unit controls the first discharge current so as not to exceed a second predetermined value larger than the first predetermined value when the calculated value is not less than the first predetermined value. The in-home discharge control device according to claim 3, wherein the in-home load is discharged.   When the calculated value is equal to or greater than the first predetermined value, the first discharge control unit controls the first discharge current to be the first predetermined value and discharges the home load. The in-home discharge control device according to claim 1 or 2. A stationary storage battery;
A second discharge control unit for controlling discharge of a second discharge current from the stationary storage battery in order to supply power to the residential load;
Further comprising
When the calculated value is larger than the first predetermined value, the second discharge control unit supplements the second discharge current with a portion of the load power that is insufficient for the discharge of the first discharge current. 6. The in-house discharge control device according to claim 5, wherein the in-house load is controlled to discharge to the in-house load. A commercial power system is connected to the above house load,
When the calculated value is larger than the first predetermined value, the system current from the commercial power system is controlled so as to compensate for the shortage of the load power due to the discharge of the first discharge current, The home discharge control device according to claim 5, further comprising a third discharge control unit that discharges the home load. A stationary storage battery;
A second discharge control unit for controlling discharge of a second discharge current from the stationary storage battery in order to supply electric power to the load;
Further comprising
When the calculated value is larger than the second predetermined value, the second discharge control unit supplements the second discharge current with a portion of the load power that is insufficient for the discharge of the first discharge current. 5. The in-home discharge control device according to claim 4, wherein the in-home load is controlled to discharge to the in-house load. A commercial power system is connected to the above house load,
When the calculated value is larger than the second predetermined value, the system current from the commercial power system is controlled so as to compensate for the shortage of the load power due to the discharge of the first discharge current, The in-home discharge control device according to claim 4, further comprising a third discharge control unit that outputs to the in-house load.   The said 1st discharge control part stops the said 1st discharge current, when the said calculated value is less than the said 1st predetermined value, The any one of Claims 1-9 characterized by the above-mentioned. Home discharge control device. A stationary storage battery;
A second discharge control unit for controlling discharge of a second discharge current from the stationary storage battery in order to supply power to the residential load;
Further comprising
The in-home discharge control according to claim 10, wherein the second discharge control unit discharges the second discharge current to the in-house load when the calculated value is less than the first predetermined value. apparatus. A commercial power system is connected to the above house load,
11. The apparatus according to claim 10, further comprising a third discharge control unit configured to output a system current from the commercial power system to the home load when the calculated value is less than the first predetermined value. Home discharge control device. A home discharge control device that is detachably connected to a predetermined external storage battery and controls discharge from the external storage battery to a home load,
A home discharge control device comprising a first discharge control unit for controlling the first discharge current from the external storage battery to be a first predetermined value during operation of the home discharge control device. A stationary storage battery;
A second discharge control unit for controlling charging and discharging of the stationary storage battery;
A detection unit for detecting the load power of the residential load;
A determination unit that determines a magnitude relationship between the load power detected by the detection unit and the first power supplied by the first discharge current of the first predetermined value;
With
When the load power is larger than the first power, the second discharge control unit is not sufficient to discharge the second discharge current from the stationary storage battery with the discharge of the first discharge current out of the load power. The in-house discharge control device according to claim 13, wherein the in-house load is controlled so as to make up for the discharge and discharged to the in-house load.   When the load power is smaller than the first power, the second discharge control unit causes the stationary storage battery to charge a surplus of the first discharge current that is not consumed as the load power. The in-home discharge control device according to claim 14. A home discharge control method for controlling discharge from a predetermined external storage battery to a home load,
A first detection step of detecting an output voltage of the external storage battery;
A second detection step of detecting load power of the residential load;
A calculation step of calculating a calculated value of the first discharge current discharged from the external storage battery from the output voltage detected in the first detection step and the load power detected in the second detection step;
A first discharge control step for controlling discharge of the first discharge current from the external storage battery in order to supply electric power to the residential load;
Including
In the first discharge control step, when the calculated value is equal to or greater than a first predetermined value, the home discharge control method is characterized in that the first discharge current is discharged to the home load.

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