JP2017022860A - Power supply system, charge/discharge control device and charge/discharge control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system which comprises a first charge/discharge control device for controlling charge/discharge of a first storage battery mounted on a vehicle and a second charge/discharge control device for controlling charge/discharge of a second storage battery installed in a building, and can control the charge/discharge of the storage batteries so that a reverse tidal current from the storage batteries to an external system and unnecessary charge/discharge of the storage batteries do not occur even when the first and the second charge/discharge control devices perform charge/discharge control independently of each other.SOLUTION: A second charge/discharge control device 22 detects a current flowing in from an external system G or flowing out to the external system G and, on the basis of the detected current, controls discharge of a second storage battery 21 so that a current does not flow from the second storage battery 21 to the external system G. A first charge/discharge control device 12 comprises: a first sensor 17a for detecting a current flowing in from the external system G or flowing out to the external system; a second sensor 17b for detecting a current flowing in to the second storage battery 21 or flowing out from the second storage battery 21; and a first control unit 14 for controlling discharge of a first storage battery 11 on the basis of each of the detected currents.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system that controls charging / discharging of a first storage battery mounted on a vehicle and a second storage battery installed in a building, a charge / discharge control device that constitutes the power supply system, and a charge / discharge control method.

  A V2H (Vehicle to Home) system that uses electric power stored in in-vehicle storage batteries such as plug-in hybrid electric vehicles (PHEV) and electric vehicles (EV) as household electric power has been put into practical use. ing. The V2H system can achieve a peak shift that saves electricity charges and reduces power demand during peak hours by charging in-vehicle storage batteries with inexpensive late-night power and using the power stored in the in-vehicle storage batteries during the day. it can.

  Patent Document 1 discloses a V2H system including a stationary storage battery that is linked to a grid.

  Furthermore, the V2H system provided with the solar power generation device and stationary storage battery linked to the system is disclosed (for example, Patent Document 2).

Japanese Patent No. 5327248 Japanese Patent No. 5539750

By the way, the V2H system according to Patent Documents 1 and 2 is a case where a stationary power storage system in which stationary storage batteries are system-linked, a solar power generation system in which photovoltaic power generation apparatuses are system-linked, a V2H system, and the like are introduced in a lump. It is assumed that each system is controlled uniformly.
However, stationary power storage systems, solar power generation systems, and V2H systems are expensive alone, and it is rare that all systems are introduced at once. For this reason, each system is comprised so that charging / discharging control may be performed independently. However, if each independent system is introduced separately, the charge / discharge control of each system may fail. For example, a reverse power flow from a stationary storage battery and an in-vehicle storage battery to an external system may occur. Moreover, there is a possibility that useless power loss may occur due to an abnormal operation in which the stationary storage battery and the in-vehicle storage battery are repeatedly charged and discharged (see FIGS. 3 to 5).

  An object of the present invention is to provide a first charge / discharge control device for controlling charge / discharge of a first storage battery mounted on a vehicle and a second charge / discharge control device for controlling charge / discharge of a second storage battery installed in a building. A power supply system capable of controlling charging / discharging of a storage battery so that reverse power flow from the storage battery to an external system and abnormal charging / discharging of the storage battery do not occur even if charge / discharge control is performed independently for each, the power It is providing the charging / discharging control apparatus and charging / discharging control method which comprise a supply system.

  The power supply system which concerns on 1 aspect of this invention is connected to the vehicle carrying a 1st storage battery so that attachment or detachment is possible, and the 1st charge / discharge control which controls the charge of the said 1st storage battery by the electric power of an external system | strain and the discharge to a load is performed. Power supply comprising a device and a second charge / discharge control device connected to a second storage battery installed in a building and controlling charging of the second storage battery and discharging to the load by power from the external system The first charge / discharge control device includes a first sensor that detects a current flowing into or out of the external system, and flowing into or out of the second storage battery. Charge of the first storage battery so that no current flows from the first storage battery to the external system based on the second sensor for detecting the current to be detected and the current detected by the first sensor and the second sensor. Control discharge A second control unit, wherein the second charge / discharge control device detects a current flowing into or out of the external system and a current detected by the sensor based on the current detected by the sensor. A second control unit that controls charging and discharging of the second storage battery so that no current flows from the second storage battery to the external system.

  A charge / discharge control apparatus according to an aspect of the present invention is a charge / discharge control apparatus that is detachably connected to a vehicle equipped with a storage battery, and that controls charging of the storage battery and discharge to a load by electric power of an external system, A first acquisition unit configured to acquire information related to a current flowing into or out of the external system; and a first acquisition unit acquiring information related to a current flowing into or out of the external power source installed in the building. 2 acquisition part and the control part which controls charging / discharging of the said storage battery based on the information acquired in the said 1st acquisition part and the said 2nd acquisition part.

  A charge / discharge control method according to an aspect of the present invention is a first charge / discharge that is detachably connected to a vehicle equipped with a first storage battery and controls charging of the first storage battery and discharge to a load by electric power of an external system. Using a control device and a second charge / discharge control device that is connected to a second storage battery installed in a building and controls the charging of the second storage battery and the discharge to the load by the power of the external system, A charge / discharge control method for controlling charge / discharge of the first storage battery and the second storage battery, wherein a current flowing into or out of the external system is detected, and based on the detected current, the first The charging / discharging of the second storage battery is controlled so that no current flows from the two storage battery to the external system, the current flowing from the external system or flowing out to the external system, and the current flowing into the second storage battery or the Out of the second storage battery Detecting a current, based on each current detected, it controls the charging and discharging of the first battery.

  The present application can be realized not only as a charge / discharge control apparatus including such a characteristic processing unit, but also as a charge / discharge control method using such characteristic processing as a step, or such a step as a computer. Or can be realized as a program to be executed. Further, it can be realized as a semiconductor integrated circuit that realizes part or all of charge / discharge control, or as other system including charge / discharge control.

  According to the above, each of the first charge / discharge control device that controls the charge / discharge of the first storage battery mounted on the vehicle and the second charge / discharge control device that controls the charge / discharge of the second storage battery installed in the building are provided. A power supply system capable of controlling charging / discharging of a storage battery so that reverse power flow from the storage battery to an external system and abnormal charging / discharging of the storage battery do not occur even when charge / discharge control is performed separately, and the power supply It is possible to provide a charge / discharge control device and a charge / discharge control method that constitute the system.

It is a block diagram which shows the example of 1 structure of the electric power supply system which concerns on Embodiment 1 of this invention. 3 is a flowchart illustrating a processing procedure of charge / discharge control according to the first embodiment. It is a conceptual diagram which shows the operation | movement at the time of performing the conventional discharge control. It is a timing chart which shows an example of abnormal operation. It is a timing chart which shows other examples of abnormal operation. It is a conceptual diagram which shows operation | movement when the 2nd storage battery is discharging. It is a timing chart which shows operation in case the 2nd storage battery is discharging. It is a conceptual diagram which shows operation | movement when the 2nd storage battery is charging. It is a timing chart which shows operation in case the 2nd storage battery is charging. It is a block diagram which shows the example of 1 structure of the electric power supply system which concerns on Embodiment 2 of this invention. It is a conceptual diagram which shows operation | movement when the 2nd storage battery is discharging. It is a conceptual diagram which shows operation | movement when the 2nd storage battery is charging. It is a block diagram which shows one structural example of the electric power supply system which concerns on Embodiment 3 of this invention. 10 is a flowchart illustrating a processing procedure of charge / discharge control according to the third embodiment.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.

(1) A power supply system according to an aspect of the present invention is a first power supply system that is detachably connected to a vehicle equipped with a first storage battery, and that controls charging of the first storage battery and discharging to a load by power from an external system. A charge / discharge control device and a second charge / discharge control device that is connected to a second storage battery installed in a building and controls charging of the second storage battery and discharge to the load by the electric power of the external system. The first charge / discharge control device includes a first sensor that detects a current flowing from the external system or flowing out to the external system, and a second sensor that flows into the second storage battery or the second storage battery. Based on the second sensor that detects the current flowing out from the storage battery, and the current detected by the first sensor and the second sensor, the first sensor is configured to prevent current from flowing from the first storage battery to the external system. Charge / discharge of storage battery A first control unit that controls the second charge / discharge control device, a sensor that detects a current flowing into or out of the external system, and a current detected by the sensor, A second control unit that controls charging and discharging of the second storage battery so that no current flows from the second storage battery to the external system.

According to this aspect, the sensor of the second charge / discharge control device detects a current flowing in from the external system or flowing out to the external system. The second control unit controls charging / discharging of the second storage battery based on the detected current so that no current flows from the second storage battery to the external system. The second charge / discharge control device controls the charge / discharge of the second storage battery independently of the first charge / discharge control device.
The first charge / discharge control device detects a current flowing in from the external system or flowing out to the external system by the first sensor. The current detected by the first sensor is information necessary for controlling charging / discharging of the first storage battery so that no current flows from the first storage battery to the external system. Moreover, a 1st charging / discharging control apparatus detects the electric current which flows in into a 2nd storage battery, or flows out from this 2nd storage battery with a 2nd sensor. In other words, the current detected by the second sensor is information necessary for determining whether or not the charge / discharge control of the first and second charge / discharge control devices can fail.
And the 1st control part of the 1st charge and discharge control device controls charge and discharge of the 1st storage battery based on the current detected with the 1st sensor and the 2nd sensor. Since the current detected by the first sensor and the second sensor has the above-described information, the charge / discharge of the first storage battery is controlled so that the charge / discharge control of the first and second charge / discharge control devices does not fail. It becomes possible to do.
Note that the current used for the charge / discharge control of the first storage battery is not necessarily information that directly indicates the actual current value, and may be information that substantially indicates the current. For example, the 1st control part may control charge and discharge of the 1st storage battery based on electric power which converted current.

(2) Preferably, the first control unit is configured to stop discharging of the first storage battery when the second sensor detects a current flowing out from the second storage battery.

  According to this aspect, the 1st control part of the 1st charge-and-discharge control device stops the discharge of the 1st storage battery, when the 2nd sensor detects the current which flows out from the 2nd storage battery. In a situation where the second charge / discharge control device is performing discharge control, when the first charge / discharge control device performs charge / discharge control, reverse power flow occurs or abnormal charge / discharge of the first storage battery occurs. For example, the charge / discharge control may fail (see FIGS. 3 to 5). Therefore, the first control unit stops the discharge of the first storage battery. If the discharge of the first storage battery is stopped, the charge / discharge control of the first and second charge / discharge control devices will not fail (see FIGS. 6 and 7).

(3) When the second sensor detects the current flowing into the second storage battery, the first control unit is configured such that the current flowing out from the first storage battery is equal to or less than the current flowing into the load. A configuration for controlling the discharge of the first storage battery is preferable.

  According to this aspect, when the first sensor of the first charge / discharge control device detects the current flowing into the second storage battery, the current flowing out from the first storage battery is equal to or less than the current flowing into the load. The discharge of the first storage battery is controlled so that That is, the first storage battery discharges power only to the load, and the second storage battery is charged with power from an external system. In this case, the charge / discharge control of the first and second charge / discharge control devices does not affect each other, and the charge / discharge control does not fail. Therefore, charge / discharge control of the first storage battery is possible such that no reverse power flow from the first storage battery to the external system occurs (see FIGS. 8 and 9).

(4) Provided in the building, comprising a power generation device that converts natural energy into electric power, and supplies the converted electric power to the first storage battery, the second storage battery, or the external system, and the second sensor Preferably, the configuration detects the current flowing into the second storage battery and the current flowing out from the second storage battery and the power generation device.

  According to this aspect, the second sensor detects the current flowing into the second storage battery and the current flowing out from the second storage battery and the power generation apparatus, and the current is the power generation apparatus as in the aspect (1). And whether the first and second charging / discharging control devices are in a situation where the charging / discharging control may fail. Therefore, even if the power supply system further includes a power generation device linked to the grid, the charge / discharge control of the first and second charge / discharge control devices does not fail, and the reverse power flow from the first storage battery to the external system does not occur. Charging / discharging control of the 1st storage battery which does not generate | occur | produce becomes possible.

(5) Preferably, the first controller is configured to stop discharging of the first storage battery when the second sensor detects a current flowing out of the second storage battery or the power generation device.

  According to this aspect, the 1st control part of the 1st charge-and-discharge control device stops discharge of the 1st storage battery, when the 2nd sensor detects the current which flows out from the 2nd storage battery and the power generator. In the situation where the second charge / discharge control device performs discharge control and the power generation device generates power, when the first charge / discharge control device performs charge / discharge control, a reverse power flow occurs or the first storage battery There is a risk that charge / discharge control will fail, such as abnormal charge / discharge. Therefore, the first control unit stops the discharge of the first storage battery (see FIG. 11). If the discharge of the first storage battery is stopped, the discharge of the power generation device and the charge / discharge control of the first and second charge / discharge control devices will not fail.

(6) When the second sensor detects the current flowing into the second storage battery, the first control unit is configured such that the current flowing out from the first storage battery is equal to or less than the current flowing into the load. A configuration for controlling the discharge of the first storage battery is preferable.

  According to this aspect, when the first sensor of the first charge / discharge control device detects the current flowing into the second storage battery, the current flowing out from the first storage battery is equal to or less than the current flowing into the load. The discharge of the first storage battery is controlled so that That is, the first storage battery supplies power only to the load, and the second storage battery is charged with power from the external system (see FIG. 12). In this case, the discharge of the power generation device and the charge / discharge control of the first and second charge / discharge control devices do not fail, and the charge / discharge control of the first storage battery does not cause a reverse flow from the first storage battery to the external system. It becomes possible.

(7) A charge / discharge control apparatus according to an aspect of the present invention is a charge / discharge control apparatus that is detachably connected to a vehicle equipped with a storage battery and controls charging of the storage battery and discharge to a load by electric power of an external system. A first acquisition unit that acquires information relating to a current flowing into or out of the external system, and information relating to a current flowing into or out of the external power source installed in the building A second acquisition unit to be acquired, and a control unit that controls charging / discharging of the storage battery based on information acquired by the first acquisition unit and the second acquisition unit.

  According to this aspect, as in aspect (1), the charging / discharging control of the first and second charging / discharging control devices does not fail, and the reverse flow from the first storage battery to the external system does not occur. Charge / discharge control becomes possible.

(8) A reception unit that receives information indicating whether or not the external power supply is chargeable / dischargeable is provided, and the control unit receives information indicating that the external power supply is chargeable / dischargeable at the reception unit. In this case, it is preferable to control the discharge of the storage battery based on the information acquired by the first acquisition unit and the second acquisition unit.

  According to this aspect, the receiving unit that receives whether or not the external power source linked to the external system is chargeable / dischargeable is provided, and the control unit relates to the aspect (7) when the external power supply is chargeable / dischargeable. Charge / discharge control can be performed, and failure of charge / discharge control can be prevented. When the external power source is a power generation device that only supplies power, the charging control according to the aspect (7) may not be performed.

(9) A charge / discharge control method according to one aspect of the present invention is detachably connected to a vehicle equipped with a first storage battery, and controls charging of the first storage battery and discharge to a load by power from an external system. 1 charge / discharge control device and a second charge / discharge control device that is connected to a second storage battery installed in a building and controls charging of the second storage battery and discharge to the load by electric power of the external system. And a charge / discharge control method for controlling charge / discharge of the first storage battery and the second storage battery, wherein current flowing into or out of the external system is detected, and based on the detected current The charging / discharging of the second storage battery is controlled so that no current flows from the second storage battery to the external system, and the current flowing into or out of the external system and the current flowing into the second storage battery Or from the second storage battery Detecting a current output, based on each current detected, it controls the charging and discharging of the first battery.

  According to this aspect, as in aspect (1), the charging / discharging control of the first and second charging / discharging control devices does not fail, and the reverse flow from the first storage battery to the external system does not occur. Charge / discharge control becomes possible.

[Details of the embodiment of the present invention]
A specific example of a power supply system according to an embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration example of a power supply system according to Embodiment 1 of the present invention. The power supply system includes a V2H system 1 and a stationary power storage system 2 that can be linked to the external system G. The V2H system 1 includes a first charging / discharging control device 12 that controls charging / discharging of the first storage battery 11 mounted on a vehicle C such as a plug-in hybrid vehicle or an electric vehicle, and uses the electric power stored in the first storage battery 11. It can be used as household power. The stationary power storage system 2 includes a second storage battery 21 installed in a house H, and a second charge / discharge control device 22 that is connected to the second storage battery 21 and controls charging / discharging of the second storage battery 21. . The V2H system 1 and the stationary power storage system 2 perform charge / discharge control separately.

The 1st charging / discharging control apparatus 12 is provided with the power conversion part 13 which converts direct current | flow and alternating current electric power bidirectionally. The power conversion unit 13 has an AC input / output terminal (not shown) through which AC power is input and output. The AC input / output terminal is connected to a commercial external system G via the distribution board 3 installed in the house H. The connecting cable is connected. A home load 4 is connected to the distribution board 3. The power conversion unit 13 has a DC input / output terminal (not shown) through which DC power is input / output, and one end of a power supply line is connected to the DC input / output terminal. A power supply plug connected to the inlet of the vehicle C is provided at the other end of the power supply line. By connecting the power supply plug to the inlet of the vehicle C, the first storage battery 11 of the vehicle C and the DC input / output terminal of the power conversion unit 13 are connected.
The power conversion unit 13 includes a bidirectional inverter 13a connected to the AC input / output terminal and a bidirectional DC / DC converter 13b connected to the DC input / output terminal. During the charging operation of the first storage battery 11, the bidirectional inverter 13a converts AC power input to the AC input / output terminal into DC power, and converts the converted DC power to the bidirectional DC / DC converter 13b. Output. The bidirectional DC / DC converter 13b converts the DC power output from the bidirectional inverter 13a into power for charging the first storage battery 11, and the voltage-converted power is supplied to the first storage battery 11 via the feeder line. Output to. During the discharging operation of the first storage battery 11, the bidirectional DC / DC converter 13 b converts the direct current power output from the first storage battery 11 through the feeder line into power of a predetermined voltage, and is converted into a voltage. The output power is output to the bidirectional inverter 13a. The bidirectional inverter 13 a converts the DC power output from the bidirectional DC / DC converter 13 b into AC power, and outputs the converted AC power to the home load 4 via the distribution board 3. . The first charge / discharge control device 12 includes an AC input / output terminal and a current sensor (not shown) that detects a current output from the DC input / output terminal, and a signal indicating the current detected by the current sensor is a first signal. It is output to the control unit 14.

A first control unit 14 is connected to the power conversion unit 13, and the operation of the power conversion unit 13 is controlled by the first control unit 14. The first control unit 14 is a microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input / output interface, and the like. A power conversion unit 13, a storage unit 15, a communication unit 16, and a monitoring unit 17 are connected to the input / output interface of the first control unit 14.
The ROM stores a program necessary for the initial operation of the computer. The RAM is a memory such as a DRAM (Dynamic RAM), an SRAM (Static RAM), etc., and a control program 10a described later read out from the storage unit 15 when the arithmetic processing of the first control unit 14 is executed, or a first Various data generated by the arithmetic processing of the control unit 14 are temporarily stored. The CPU controls the operation of each component by executing the control program 10 a and controls the charging / discharging of the first storage battery 11. For example, a signal indicating the current output from the power conversion unit 13 is input to the first control unit 14, and the first control unit 14 transmits the in-home load 4 and the load from the power conversion unit 13 based on the signal. Charge / discharge control is performed so that the current output to the first storage battery 11 matches the target current.

  The storage unit 15 is a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable ROM) or a flash memory, and stores a control program 10a necessary for charge / discharge control according to the present invention.

  Further, the control program 10a according to the present embodiment may be recorded in the recording medium 10 so as to be readable by a computer. The storage unit 15 stores a control program 10a read from the recording medium 10 by a reading device (not shown). The recording medium 10 is a CD (Compact Disc) -ROM, a DVD (Digital Versatile Disc) -ROM, an optical disc such as a BD (Blu-ray (registered trademark) Disc), a flexible disc, a magnetic disc such as a hard disc, a magnetic optical disc, and a semiconductor memory. Etc. Further, the control program 10 a according to the present embodiment may be downloaded from an external computer (not shown) connected to the communication network and stored in the storage unit 15.

  One end of a communication line is connected to the communication unit 16, and the other end of the communication line is connected to a power supply plug. By connecting the power supply plug to the inlet of the vehicle C, the charging ECU 11a mounted on the vehicle C and the communication unit 16 of the first charge / discharge control device 12 are connected. The communication line constitutes a charging cable together with the power supply line. The communication unit 16 is a circuit that transmits and receives various types of information necessary for charging and discharging the first storage battery 11 to and from the charging ECU 11a. The communication unit 16 performs communication in accordance with, for example, the CHAdeMO (CHAdeMO) standard and the combo (Combo) method. The operation of the communication unit 16 is controlled by the first control unit 14. The first charge / discharge control device 12 communicates with the charge ECU 11a to perform processing such as confirmation of connection of the power supply plug, exchange of various parameters necessary for charge, safety confirmation, charge / discharge start and stop control, and the like. And charge / discharge of the first storage battery 11 is controlled.

  The monitoring unit 17 is installed in the house and detects the current flowing into or out of the external system G. The monitoring unit 17 flows into the second storage battery 21 or from the second storage battery 21. And a second sensor 17b for detecting the flowing current. The first sensor 17a and the second sensor 17b are, for example, current transformers that detect an alternating current. The first sensor 17a is provided in a cable connecting the distribution board 3 and the external system G, detects a current flowing through the cable, and a signal corresponding to the detected current is sent to the monitoring unit 17. Entered. The second sensor 17b is provided in a cable connecting the distribution board 3 and the second charge / discharge control device 22, detects a current flowing through the cable, and outputs a signal corresponding to the detected current magnitude. Input to the monitoring unit 17. The monitoring unit 17 calculates current, power, and the like flowing through each cable based on signals input from the first sensor 17a and the second sensor 17b. The monitoring unit 17 outputs information such as the calculated current and power to the first control unit 14. That is, the monitoring unit 17 first sets information regarding the current flowing into or out of the external system G and information regarding the current flowing into or out of the second storage battery 21 with the first information. The information is output to the control unit 14, and the first control unit 14 acquires the information output from the monitoring unit 17.

The second charge / discharge control unit 22 includes a power conversion unit, a second control unit 24 and a storage unit similar to the first charge / discharge control device 12. The second charge / discharge control device 22 is connected to the external system G and the second storage battery 21. The power conversion unit of the second charge / discharge control device 22 converts the AC power input from the external system G through the distribution board 3 into the DC power for charging during the charging operation of the second storage battery 21. The converted electric power is output to the second storage battery 21. The power conversion unit of the second charge / discharge control device 22 converts the DC power output from the second storage battery 21 into AC power during the discharging operation of the second storage battery 21, and converts the converted AC power. Is output to the home load 4 or the first charge / discharge control device 12 via the distribution board 3.
A sensor 23 is connected to the second control unit 24 of the second charge / discharge control unit 22 to detect a current flowing in from the external system G or flowing out to the external system G. The sensor 23 is a current transformer, for example. The second control unit 24 drives the power conversion unit based on the current detected by the sensor 23 so that no current flows from the second storage battery 21 to the external system G, and controls charging / discharging of the second storage battery 21. To do.

  FIG. 2 is a flowchart illustrating a discharge control processing procedure according to the first embodiment. The first control unit 14 of the first charge / discharge control device 12 executes the following process when a charge / discharge start operation is received by an operation unit (not shown) or when a preset charge / discharge start time is reached. To do. The 1st control part 14 of the 1st charge-and-discharge control device 12 detects current Ia which flows in from external system G or flows out to this external system G by the 1st sensor 17a (Step S11). Here, the current Ia flowing from the external system G is positive, and the current Ia flowing out to the external system G is negative. Moreover, the 1st control part 14 detects the electric current Ib with the 2nd sensor 17b (step S12). Here, the current Ib flowing to the second storage battery 21 side is positive, and the current flowing to the distribution board 3 side is negative.

  Then, the first control unit 14 determines whether or not the current Ib detected by the second sensor 17b is positive (step S13). That is, the first control unit 14 determines whether or not the current Ib is flowing to the second storage battery 21 side. In other words, the first control unit 14 determines whether or not the second storage battery 21 is charging.

  When it determines with the electric current Ib not being positive (step S13: NO), the 1st control part 14 sets the upper limit M of the electric current which the 1st storage battery 11 discharges to 0 (step S14).

  When it determines with the electric current Ib being positive (step S13: YES), the 1st control part 14 calculates the electric current Ic which flows in into the household load 4 (step S15). For example, the first control unit 14 calculates the current Ic by subtracting the current Ib from the current Ia when the first storage battery 11 is not discharging. When power is already supplied from the first storage battery 11 to the home load 4, the first control unit 14 subtracts the current Ib from the current Ia and adds the current supplied from the first storage battery 11 to the home load 4. By doing so, the current Ic flowing through the home load 4 can be calculated. In addition, you may comprise so that the electric current Ic which flows into the in-home load 4 may be detected directly with a current sensor. And the 1st control part 14 sets current Ic as upper limit M of the current which the 1st storage battery 11 discharges (Step S16). That is, the first control unit 14 sets the current Ic consumed by the home load 4 as the upper limit value M.

  The first control unit 14 that has finished the process of step S14 or step S16, when the first storage battery 11 is not charging from the contract current with the power company as the upper limit value m of the current charged by the first storage battery 11 The current obtained by subtracting the current Ia is set (step S17). When the first storage battery 11 is already charged, the first control unit 14 subtracts the current Ia from the contract current, and adds the current flowing into the first storage battery 11 to obtain the current obtained by What is necessary is just to set as an upper limit m. That is, the upper limit value m of the charging current is set so that the current from the external system G does not exceed the contract current.

  Next, the first control unit 14 determines a target current for charging / discharging the first storage battery 11 by a predetermined algorithm (step S18). For example, the first control unit 14 determines the target current for charging / discharging so that the current Ia becomes 0 [A].

  And the 1st control part 14 judges whether a target current is below an upper limit (Step S19). Specifically, when discharging, the first control unit 14 determines whether or not the target current for discharging is equal to or lower than the upper limit value M, and when charging, the target current for charging is the upper limit value m. It is determined whether or not:

  When it is determined that the target current exceeds the upper limit value (step S19: NO), the first control unit 14 sets the upper limit value as the target current (step S20). Specifically, the first control unit 14 sets an upper limit value M as a target current for discharging when discharging, and sets an upper limit value m as a target current for charging when charging.

  When it determines with a target current being below an upper limit (step S19: YES), or when the process of step S20 is complete | finished, the 1st control part 14 is charging / discharging control of the 1st storage battery 11 based on a target current. Is performed (step S21).

  Next, the first control unit 14 determines whether or not charge / discharge control should be stopped (step S22). For example, the first control unit 14 determines that the charge / discharge control should be stopped when a charge / discharge control stop operation is received by an operation unit (not shown) or when a preset charge / discharge stop time is reached. . When it determines with charging / discharging control to be stopped (step S22: YES), the 1st control part 14 stops charging / discharging control of the 1st storage battery 11 (step S23), and complete | finishes a process. When it determines with charging / discharging control not to be stopped (step S22: NO), the 1st control part 14 returns a process to step S11, and continues the charging / discharging control of the 1st storage battery 11. FIG.

  The effects of the power supply system according to the first embodiment configured as described above will be described. In order to facilitate understanding of the operational effects, first, an operation when conventional discharge control is performed will be described as a comparative example, and then an operation when charge / discharge control according to the first embodiment is performed will be described.

  FIG. 3 is a conceptual diagram showing an operation when conventional discharge control is performed. Open arrows indicate the current flow. Temporarily, the 1st and 2nd charging / discharging control apparatuses 12 and 22 each performed charging / discharging control of the 1st and 2nd storage batteries 11 and 21 so that the input-output current of the external system | strain G might be set to 0 [A]. In this case, an abnormal current flow as shown in FIG. 3 occurs. That is, abnormalities such as reverse power flow from the first and second storage batteries 11, 21 to the external system G, and repeated charging / discharging of the first and second storage batteries 11, 21 occur.

  FIG. 4 is a timing chart showing an example of abnormal operation, and FIG. 5 is a timing chart showing another example of abnormal operation. 4A and 5A show the charge / discharge power of the second storage battery 21, FIGS. 4B and 5B show the charge / discharge power of the first storage battery 11, and FIGS. 4C and 5C show the power sales to the external system G and the external power. The purchased power from the system G is shown, and FIGS. 4D and 5D show the power consumption of the home load 4. It is assumed that the power consumption of the home load 4 increases or decreases in a rectangular pulse shape. In FIG. 4, the current of the first storage battery 11 is PID controlled so that the first charge / discharge control device 12 operates in proportion to the control parameter P = 0.99, and the second charge / discharge control device 22 controls the control parameter P The simulation result at the time of carrying out PID control of the electric current of the 2nd storage battery 21 so that it may carry out a proportional operation at = 0.9 is shown. Further, FIG. 5 shows that the first charge / discharge control device 12 performs PID control on the current of the first storage battery 11 so that the first charge / discharge control device 12 operates in proportion to the control parameter P = 0.99, and the second charge / discharge control device 22 controls the current. The simulation result when the current of the second storage battery 21 is PID controlled so that the proportional operation and the integral operation are performed with the parameters P = 0.9 and I = 0.3 is shown.

  When the power consumption of the home load 4 increases or decreases in a rectangular pulse shape, as can be seen from FIG. 4B and FIG. 5A, an abnormality occurs in which the first and second storage batteries 11 and 21 are repeatedly charged and discharged. As shown in FIGS. 4C and 5C, the first and second charge / discharge control devices 12 and 22 cause a reverse power flow from the first and second storage batteries 11 and 21 to the external system G.

Next, the operation when the first charge / discharge control device 12 performs the charge / discharge control according to the first embodiment will be described.
6 is a conceptual diagram showing an operation when the second storage battery 21 is discharged, and FIG. 7 is a timing chart showing an operation when the second storage battery 21 is discharged. 7A to 7D are similar to FIG. 4, the charge / discharge power of the first storage battery 11, the charge / discharge power of the second storage battery 21, the power sales / purchase power of the first storage battery 11, and the power consumption of the home load 4. Is shown. As shown in FIG. 7D, the power consumption of the home load 4 increases or decreases in a rectangular pulse shape, and the second charge / discharge control device 22 supplies power to the home load 4 so as to follow the power consumption of the home load 4. doing. When the 2nd storage battery 21 is discharging, since the upper limit M concerning discharge of the 1st storage battery 11 is 0 [A], as shown in Drawing 6, the 1st charge and discharge control device 12 is the 1st storage battery 11 To prevent discharge. Therefore, the charge / discharge control of the first charge / discharge control device 12 and the second charge / discharge control device 22 does not compete and fail. Specifically, in the charge / discharge control method of the first embodiment, as can be seen from FIGS. 7A and 7B, there is no abnormal operation in which the first storage battery 11 and the second storage battery 21 are repeatedly charged and discharged. . Further, as shown in FIG. 7C, no reverse power flow from the first and second storage batteries 11, 21 to the external system G occurs.

  FIG. 8 is a conceptual diagram showing an operation when the second storage battery 21 is charged, and FIG. 9 is a timing chart showing an operation when the second storage battery 21 is charged. 9A to 9D are similar to FIG. 7, the charge / discharge power of the first storage battery 11, the charge / discharge power of the second storage battery 21, the power sales / purchase power of the first storage battery 11, and the power consumption of the home load 4. Is shown. As shown in FIG. 9D, the power consumption of the home load 4 increases and decreases in a rectangular pulse shape. 9B and 9D, the second charge / discharge control device 22 charges the second storage battery 21 with the electric power supplied from the external system G. When the 2nd storage battery 21 is charging, since the upper limit M which concerns on discharge of the 1st storage battery 11 is the electric current consumed by the residential load 4, as shown in FIG. The discharge control is performed so that the first storage battery 11 supplies the power consumed by the home load 4. In this case, the discharge control between the first charge / discharge control device 12 and the second charge / discharge control device 22 does not compete. Specifically, as can be seen from FIG. 9A and FIG. 9B, the abnormal operation in which the first storage battery 11 and the second storage battery 21 repeat charging and discharging does not occur. Moreover, as shown to FIG. 9C, the reverse power flow from the 1st and 2nd storage batteries 11 and 21 to the external system | strain G has also not generate | occur | produced.

  According to the power supply system according to the first embodiment configured as described above, even if the first and second charge / discharge control devices 12 and 22 perform charge / discharge control independently of each other, the first and second The charging / discharging of the first and second storage batteries 11, 21 can be controlled so that the reverse power flow from the storage batteries 11, 21 to the external system G and the abnormal charging / discharging of the first and second storage batteries 11, 21 do not occur.

  Moreover, when the 2nd storage battery 21 is discharging, by stopping discharge of the 1st storage battery 11, the charge / discharge control of the 1st and 2nd charge / discharge control apparatuses 12 and 22 does not fail, and the 1st storage battery 11 Charging / discharging control of the 1st storage battery 11 which the reverse power flow to the external system | strain G and the abnormal charging / discharging of the 1st and 2nd storage batteries 11 and 21 do not generate | occur | produce becomes possible.

  Furthermore, when the 2nd storage battery 21 is charging, the discharge control of the 1st storage battery 11 is performed in the range which does not exceed the electric power consumed with the load 4 in the house. Accordingly, the charge / discharge control of the first and second charge / discharge control devices 12 and 22 does not fail, and the reverse power flow from the first storage battery 11 to the external system G and the abnormal charge / discharge of the first and second storage batteries 11 and 21 occur. Charge / discharge control of the first storage battery 11 that does not occur is possible.

  In the present embodiment, the first and second charge / discharge control devices 12 and 22 are installed in the house H, and the power supply system that uses the power stored in the first and second storage batteries 11 and 21 as household power. However, you may install the 1st and 2nd charging / discharging control apparatuses 12 and 22 in the arbitrary buildings which have the load which consumes the electric power of the external system | strain G. FIG. The 1st charging / discharging control apparatus 12 can also supply the electric power stored in the 1st storage battery 11 of the vehicle C to the load of the said building.

  Moreover, although this embodiment demonstrated the example which the 1st control part 14 performs charging / discharging control of a 1st storage battery based on the electric current detected by the 1st and 2nd sensors 17a and 17b, it respond | corresponds to this electric current. You may comprise so that charging / discharging control of a 1st storage battery may be performed based on the information of the electric power to perform.

(Embodiment 2)
Since the power supply system according to the second embodiment is different from the first embodiment in that it further includes a grid-connected solar power generation system, the differences will be mainly described below, and corresponding portions are denoted by the same reference numerals. Therefore, detailed description is omitted.

  FIG. 10 is a block diagram illustrating a configuration example of the power supply system according to the second embodiment of the present invention. In addition to the V2H system 1 and the stationary power storage system 2, the power supply system includes a photovoltaic power generation system 5 linked to the system. The photovoltaic power generation system 5 includes a PV (photovoltaic) panel 51 and a power conditioner (PCS) 52 installed in a house H. The PV panel 51 has a plurality of strings composed of a plurality of solar cell modules connected in series. The plurality of strings are connected in parallel to a connection box (not shown), and DC power generated by the PV panel 51 is input to the connection box. The junction box aggregates the power output from each string of the PV panel 51 and outputs the aggregated DC power to the power conditioner 52. The power conditioner 52 converts the DC power output from the connection box into AC power, and outputs the converted AC power to the distribution board 3.

  The second sensor 17 b of the first charge / discharge control device 12 detects input / output currents of the power conditioner 52 and the second charge / discharge control device 22. The second sensor 17b may individually detect the currents input / output to / from the power conditioner 52 and the second charge / discharge control device 22, or input / output from / to the power conditioner 52 and the second charge / discharge control device 22. You may detect the sum of each electric current in the location where each electric current merges. The processing operation of the first control unit 14 is the same as that of the first embodiment.

FIG. 11 is a conceptual diagram showing an operation when the second storage battery 21 is discharged. When current flows from the second storage battery 21 or the PV panel 51 to the distribution board 3 side, the first charge / discharge control device 12 performs control so that the first storage battery 11 is not discharged. Accordingly, the discharge control of the first charge / discharge control device 12 and the second charge / discharge control device 22 does not compete. The second charge / discharge control device 22 performs charge / discharge control so that the discharged current does not flow to the external system G. The power discharged from the second storage battery 21 and the power generated by the PV panel 51 are supplied to the home load 4 and consumed.
The second charge / discharge control device 22 may control the second storage battery 21 not to discharge when the PV panel 51 is generating power, or only the power for the power consumption of the home load 4 The discharge control may be performed so that the secondary storage battery 21 is discharged.

  FIG. 12 is a conceptual diagram showing an operation when the second storage battery 21 is charged. The second charge / discharge control device 22 charges the second storage battery 21 with the electric power supplied from the external system G. When the 2nd storage battery 21 is charging, as shown in FIG. 12, the 1st charging / discharging control apparatus 12 performs discharge control so that the 1st storage battery 11 supplies the electric power consumed with the load 4 in the house. . In this case, the discharge control between the first charge / discharge control device 12 and the second charge / discharge control device 22 does not compete.

  According to the power supply system according to the second embodiment configured as described above, similarly to the first embodiment, the system is linked to the photovoltaic power generation system 5, and the first and second charge / discharge control devices 12 and 22 are connected to each other. Even if charge / discharge control is performed independently, the reverse power flow from the first and second storage batteries 11 and 21 to the external system G and the abnormal charge and discharge of the first and second storage batteries 11 and 21 do not occur. Charge / discharge of the two storage batteries can be controlled.

  Moreover, when the 2nd storage battery 21 or the PV panel 51 is discharging, the charge / discharge control of the 1st and 2nd charge / discharge control apparatuses 12 and 22 does not fail by stopping discharge of the 1st storage battery 11, The reverse flow from the first storage battery 11 to the external system G and the charging / discharging control of the first storage battery 11 such that the abnormal charging / discharging of the first and second storage batteries 11, 21 do not occur are possible.

  Furthermore, when the 2nd storage battery 21 is charging, the discharge control of the 1st storage battery 11 is performed in the range which does not exceed the electric power consumed with the load 4 in the house. Accordingly, the charge / discharge control of the first and second charge / discharge control devices 12 and 22 does not fail, and the reverse power flow from the first storage battery 11 to the external system G and the abnormal charge / discharge of the first and second storage batteries 11 and 21 occur. Charge / discharge control of the first storage battery 11 that does not occur is possible.

  Although the example in which the PV panel 51 is linked to the system has been described, the present invention is applied to a system in which a power generation device that generates electric power related to other natural energy, such as wind power generation, hydroelectric power generation, and geothermal power generation, is linked to the system. Also good.

(Embodiment 3)
Since the power supply system according to the third embodiment is provided with an operation unit for switching the mode of charge / discharge control and the processing content of charge / discharge control is different from that of the first embodiment, the following mainly describes the differences. Corresponding portions are denoted by the same reference numerals and detailed description thereof is omitted.

  FIG. 13 is a block diagram illustrating a configuration example of a power supply system according to Embodiment 3 of the present invention. The power supply system according to the third embodiment includes the same V2H system 301 as that of the first embodiment. In FIG. 13, an external power supply 302 is a stationary power storage system, a solar power generation system, or the like that can be introduced into the power supply system. The charge / discharge control device 312 according to the third embodiment includes an operation unit 318 connected to the control unit 314. The operation unit 318 is, for example, a touch sensor or a mechanical operation button provided on the surface or inside of the display unit. The touch sensor receives a user operation by detecting that the user's finger touches the display unit, a position where the finger touches, and the like, and gives the received operation information to the control unit 314. That is, the control unit 314 can accept a user operation at the operation unit 318. For example, the control unit 314 according to the third embodiment accepts the type of the external power source 302 introduced into the power supply system. Specifically, the control unit 314 receives whether or not the external power supply 302 includes a chargeable / dischargeable power supply. More specifically, the control unit 314 receives whether or not the external power supply 302 includes the stationary power storage system 2, whether or not the solar power generation system 5 is included, and stores the information related to the received external power supply 302 in the storage unit 15. To remember. When the connected external power supply 302 includes a chargeable / dischargeable power supply like the stationary power storage system 2, the control unit 314 performs charge / discharge control similar to that in the first and second embodiments. When the connected external power source 302 is configured only with a power source that can only perform power generation and cannot be charged as in the solar power generation system 5, the control unit 314 uses the same method as the conventional method to sell power. Charge / discharge control according to the method is performed. When the external power supply 302 is not introduced, the first charge / discharge control device 312 controls the charge / discharge of the first storage battery 11 so that current does not flow to the external system G by a method similar to the conventional method.

  The second sensor 17 b of the charge / discharge control device 312 detects a current that is input to the external power supply 302 or flows out of the external power supply 302. The processing operation of the control unit 314 is the same as the processing operation of the first control unit 14 of the first embodiment.

  FIG. 14 is a flowchart illustrating a processing procedure of charge / discharge control according to the third embodiment. The charge / discharge control apparatus according to the third embodiment determines whether or not the stationary power storage system 2 is included in the external power supply 302 based on the information indicating the type of the external power supply 302 stored in the storage unit 15 (step). S311). When it is determined that the stationary power storage system 2 is included in the external power source 302 (step S311: YES), the control unit 314 performs the first operation linked to the stationary power storage system according to the same processing procedure as that of the first or second embodiment. The charge / discharge control of the one storage battery 11 is performed (step S312), and the process is finished.

  When it is determined that the stationary power storage system 2 is not included in the external power source 302 (step S311: NO), the control unit 314 determines whether the solar power generation system 5 is included in the external power source 302 (step S311: NO). S313). When it determines with the solar power generation system 5 being included (step S313: YES), the control part 314 performs charging / discharging control of the 1st storage battery 11 linked with the solar power generation system according to the power sale method. (Step S314), the process ends. For example, in the first power selling method, the control unit 314 performs control so that the first storage battery 11 is not discharged when the PV panel 51 is generating power. Further, in the second power selling method, when the PV panel 51 is generating power, the control unit 314 performs discharge control so that only the power for the power consumed by the home load 4 is discharged from the first storage battery 11. Do.

  When it determines with the solar power generation system 5 not being included in the external power supply 302 (step S313: NO), the control part 314 is 1st storage battery so that the reverse power flow from the 1st storage battery 11 to the external system | strain G may not generate | occur | produce. 11 is performed (step S315), and the process ends.

  According to the power supply system according to the third embodiment configured as described above, even when the V2H system 301, the stationary power storage system as the external power supply 302, the solar power generation system, and the like are separately introduced at different times. By setting the type of the external power supply 302 in the operation unit 318, each storage battery is prevented from causing reverse flow from the first storage battery 11 to the external system G and abnormal charging / discharging of the first and second storage batteries 11, 21. Can be controlled.

1,301 V2H system 2 stationary power storage system 3 distribution board 4 home load 5 solar power generation system 11 first storage battery 11a charging ECU
12, 312 First charge / discharge control device 13 Power conversion unit 13a Bidirectional inverter 13b Bidirectional DC / DC converter 14 First control unit 15 Storage unit 16 Communication unit 17 Monitoring unit 17a First sensor 17b Second sensor 21 Second storage battery 22 Second Charge / Discharge Control Device 23 Sensor 24 Second Control Unit 51 PV Panel 52 Power Conditioner 302 External Power Supply 314 Control Unit 318 Operation Unit C Vehicle G External System H House

Claims (9)

A first charge / discharge control device that is detachably connected to a vehicle equipped with the first storage battery and controls the charging of the first storage battery and the discharge to the load by the electric power of the external system, and the second storage battery installed in the building A power supply system comprising: a second charge / discharge control device connected to the second storage battery for controlling the charging of the second storage battery and the discharging to the load by the power of the external system;
The first charge / discharge control device includes:
A first sensor that detects a current flowing into or out of the external system;
A second sensor for detecting a current flowing into or out of the second storage battery;
A first control unit that controls charging / discharging of the first storage battery based on the current detected by the first sensor and the second sensor so that no current flows from the first storage battery to the external system; Prepared,
The second charge / discharge control device includes:
A sensor for detecting a current flowing into or out of the external system;
A power supply system comprising: a second control unit that controls charging / discharging of the second storage battery so that no current flows from the second storage battery to the external system based on the current detected by the sensor. The first controller is
The power supply system according to claim 1, wherein when the second sensor detects a current flowing out from the second storage battery, discharging of the first storage battery is stopped. The first controller is
When the second sensor detects the current flowing into the second storage battery, the discharge of the first storage battery is controlled so that the current flowing out from the first storage battery is equal to or less than the current flowing into the load. The power supply system according to claim 1 or claim 2. Provided in the building, comprising a power generator that converts natural energy into electric power and supplies the converted electric power to the first storage battery, the second storage battery or the external system;
The second sensor is
The power supply system according to claim 1, wherein a current flowing into the second storage battery and a current flowing out of the second storage battery and the power generation device are detected. The first controller is
The power supply system according to claim 4, wherein when the second sensor detects a current flowing out of the second storage battery or the power generation device, discharging of the first storage battery is stopped. The first controller is
When the second sensor detects the current flowing into the second storage battery, the discharge of the first storage battery is controlled so that the current flowing out from the first storage battery is equal to or less than the current flowing into the load. The power supply system according to claim 4 or 5. A charge / discharge control device that is detachably connected to a vehicle equipped with a storage battery and controls charging of the storage battery and discharge to a load by electric power of an external system,
A first acquisition unit for acquiring information relating to a current flowing into or out of the external system;
A second acquisition unit for acquiring information related to a current flowing into or out of the external power source installed in the building;
A charge / discharge control apparatus comprising: a control unit that controls charge / discharge of the storage battery based on information acquired by the first acquisition unit and the second acquisition unit. A reception unit that receives information indicating whether the external power source is chargeable / dischargeable;
The controller is
When the information indicating that the external power source is chargeable / dischargeable is received by the reception unit, the discharge of the storage battery is controlled based on the information acquired by the first acquisition unit and the second acquisition unit. The charge / discharge control apparatus according to claim 7. A first charge / discharge control device that is detachably connected to a vehicle equipped with the first storage battery and controls the charging of the first storage battery and the discharge to the load by the electric power of the external system, and the second storage battery installed in the building Charge and discharge of the first storage battery and the second storage battery using a second charge / discharge control device that is connected and controls the charging of the second storage battery by the power of the external system and the discharge to the load. A charge / discharge control method for controlling,
Detecting current flowing in or out of the external system,
Based on the detected current, the charging and discharging of the second storage battery is controlled so that no current flows from the second storage battery to the external system,
Detecting a current flowing into or out of the external system and a current flowing into or out of the second storage battery;
A charge / discharge control method for controlling charge / discharge of the first storage battery based on each detected current.

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