AU2016217361A1 - Storage battery control device and storage battery system - Google Patents
Storage battery control device and storage battery system Download PDFInfo
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- AU2016217361A1 AU2016217361A1 AU2016217361A AU2016217361A AU2016217361A1 AU 2016217361 A1 AU2016217361 A1 AU 2016217361A1 AU 2016217361 A AU2016217361 A AU 2016217361A AU 2016217361 A AU2016217361 A AU 2016217361A AU 2016217361 A1 AU2016217361 A1 AU 2016217361A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention addresses the problem of increasing the amount of electric power that can be extracted from an electricity storage device. A storage battery control device (10) is provided with an input unit (11), an output unit (12) and a processing unit (13). The processing unit (13) determines instructions to be provided to an electric power converting device (3) so as to adjust a value of an electric current output by an electricity storage device (2). The electric power converting device (3) is connected in such a way as to be interconnected with an electric power system (5). If a voltage value received by the input unit (11) drops to a predetermined lower limit while the value of the electric current output by the electricity storage device (2) is being maintained at a constant current, the processing unit (13) thereafter provides instructions to the electric power converting device (3) by way of the output unit (12) in such a way as to cause the electric current output by the electricity storage device (2) to decrease. The electric current output from the electricity storage device (2) is caused to decrease within a range which allows the electric power converting device (3) to continue outputting alternating-current power.
Description
DESCRIPTION
STORAGE BATTERY CONTROL DEVICE AND STORAGE BATTERY
SYSTEM
TECHNICAL FIELD
[0001]
The present invention relates to a storage battery control device of controlling outputting of a electricity storage device, and a storage battery system including a storage battery control device.
BACKGROUND ART
[0002]
In the related art, a storage battery system in which an electricity storage device, a power converter, and a controller are provided has been proposed (see PTL 1 (Japanese Patent No. 5392357)). The power converter converts AC power into DC power at the time of charging the electricity storage device, and converts the DC power into the AC power at the time of discharging from the electricity storage device. In addition, the controller controls an operation of the power converter.
[0003]
In PTL 1, a technology for controlling the power converter in which discharging is performed from the electricity storage device by a control method suitable for an electric power situation of a house and a long life of the electricity storage device is achieved, in a case where a power generation device including a solar cell and the electricity storage device are present at the same 1
9339772_1 (GHMatters) P106523.AU time, is described. In the storage battery system described in PTL 1, the controller controls an operation of the power converter so as to perform current control in a case where a voltage of a lead-in wire is smaller than a threshold voltage and to perform voltage control in a case where the voltage of the lead-in 5 wire is larger than the threshold value.
[0004]
The storage battery system described in PTL 1 performs the current control at the time of discharging from the electricity storage device, and a discharge current is determined so that electric energy stored in the electricity 10 storage device is exhausted in a discharge time zone. As a result, the power storage system described in PTL 1 attempts to extend the life of the electricity storage device. However, PTL 1 does not specifically describe a technology for controlling the discharge current in order to exhaust the electric power energy stored in the electricity storage device. 15
SUMMARY OF THE INVENTION
[0005]
An object of the present invention is to provide a storage battery control device that attempts to increase the electric energy output from an electricity 20 storage device and further to provide a storage battery system using the storage battery control device.
[0006]
According to an aspect of the present invention, there is provided a storage battery control device including an input unit, an output unit, and a 25 processing unit. The input unit receives a value of a voltage output from an electricity storage device. The output unit provides an operation instruction to 2
9339772_1 (GHMatters) P106523.AU an electric power converting device that converts DC power output from the electricity storage device into AC power. The processing unit determines the instruction to be provided to the electric power converting device so as to adjust a current output from the electricity storage device. The electric power converting device is interconnected with an electric power system. When the value of the voltage received by the input unit decreases to a predetermined lower limit value in a period in which a value of a current output from the electricity storage device is maintained at a constant current, the processing unit thereafter provides the instruction to the electric power converting device through the output unit so as to decrease the current within a range in which the electric power converting device can continuously output the AC power.
[0007]
According to another aspect of the present invention, there is provided a storage battery system including the electricity storage device, the electric power converting device, and the storage battery control device. The electric power converting device converts the DC power output from the electricity storage device into the AC power, and is interconnected with an electric power system. The storage battery control device receives a value of a voltage output from the electricity storage device, and provides an operation instruction to the electric power converting device so as to adjust a value of a current output from the electricity storage device, when the value of the voltage received in a period in which the value of the current is maintained at a constant current decreases to a predetermined lower limit value, the storage battery control device thereafter provides the instruction to the electric power converting device so as to decrease the current within a range in which the electric power converting device can continuously output the AC power. 3
9339772_1 (GHMatters) P106523.AU
BRIEF DESCRIPTION OF DRAWINGS
[0008] FIG. 1 is a block diagram illustrating a storage battery system of an embodiment. FIG. 2 is an operation explanation diagram of the storage battery system of the embodiment. FIG. 3 is an operation explanation diagram of a storage battery system of a comparison example.
DESCRIPTION OF EMBODIMENTS
[0009] A storage battery system, which will be described below, as illustrated in FIG. 1, is configured to perform system interconnection with electric power system 5, and includes electricity storage device 2, electric power converting device 3, management device 4, and storage battery control device 10. Hereinafter, a "storage battery control device" is simply referred to as a "control device". Management device 4 serves as a transmission path for transmitting an output value of monitor 23 (described below) of electricity storage device 2 with control device 10 therebetween. In addition, as described below, management device 4 functions as a protective device that stops operations of electricity storage device 2 and electric power converting device 3 in a case where an abnormality occurs in electricity storage device 2. That is, since management device 4 does not function at all times, it is not an essential element in the present embodiment. In FIG. 1, solid lines connected to the elements represent power supply lines, and dotted lines connected to the 4 9339772_1 (GHMatters) P106523.AU elements represent signal lines (information lines).
[0010]
Electricity storage device 2 of the present embodiment has a configuration in which a plurality of battery modules 20 are provided in housing 22, and has a capacity (for example, 10 kWh) that can be used in houses, small stores, and small offices. Each of plurality of battery modules 20 includes one or plurality of storage batteries 21. Although storage battery 21 is assumed to be a lithium ion battery, another storage battery such as a lead storage battery may be used. Battery module 20 includes monitor 23 that monitors a terminal voltage (output voltage) and an output current of battery module 20, and a temperature of battery module 20. Monitor 23 has a function of transmitting an output value such as a value of the voltage, a value of the current, and a value of the temperature which are measured. Although the output value of monitor 23 is assumed as a digital value, it is also possible to use an analog value.
[0011]
Electric power converting device 3 has a function of performing bidirectional electric power conversion between electricity storage device 2 and electric power system 5. That is, electric power converting device 3 converts DC power output from electricity storage device 2 into AC power, and supplies the AC power to load 51 together with the AC power supplied from electric power system 5. In addition, electric power converting device 3 converts the AC power supplied from electric power system 5 into the DC power, and charges electricity storage device 2 by the DC power. As described above, although electricity storage device 2 performs charging and discharging, hereinafter, a discharging operation (that is, electric power supply with respect 5 9339772J (GHMatters) P106523.AU to load 51) of electricity storage device 2 will be described.
[0012]
Electric power converting device 3 includes a circuit that controls a DC voltage output from electricity storage device 2 and a circuit that performs 5 conversion from the DC power into the AC power. These circuits are a type of a switching power supply, and electric power converting device 3 controls a timing of turning on and off of switching elements, thereby limiting an input current from electricity storage device 2 or adjusting an output current to load 51. Since electric power system 5 is connected to an AC side terminal of 10 electric power converting device 3, a frequency and a phase of the AC power output from electric power converting device 3 are adjusted to be equalized with those of electric power system 5 at the time of discharging electricity storage device 2. In addition, a value of the voltage of the AC-side terminal of electric power converting device 3 is equalized with that of electric power system 5. 15 That is, even if a terminal voltage of battery module 20 decreases at the time of discharging electricity storage device 2, when electric power system 5 is normal without being interrupted, a value of the output voltage of electric power converting device 3 is equalized with a value of the voltage of electric power system 5. 20 [0013]
Control device 10 instructs the operation of electric power converting device 3. Control device 10 receives a value of the voltage output from electricity storage device 2 through management device 4, and provides an instruction relating to an operation of electric power converting device 3 based 25 on this value of the voltage. Management device 4 stops operations of electricity storage device 2 and electric power converting device 3 when an 6
9339772_1 (GHMatters) P106523.AU abnormality of battery module 20 is detected by the output value of monitor 23. Although a configuration in which control device 10 is accommodated in a housing different from that of electric power converting device 3, control device 10 may share a housing with electric power converting device 3, and it is 5 possible to share a circuit board with electric power converting device 3. Alternately, control device 10 can share a housing with management device 4, and can share a circuit board with management device 4.
[0014]
Control device 10 includes input unit 11, output unit 12, and processing 10 unit 13. Input unit 11 receives the value of the voltage measured by monitor 23 through management device 4. In addition, output unit 12 provides an operation instruction to electricity storage device 2 and electric power converting device 3. Processing unit 13 determines content of an instruction to be provided to electric power converting device 3 so as to adjust a value of the 15 current output from electricity storage device 2 by using a value of the voltage received by input unit 11 from monitor 23. The content of the instruction by processing unit 13 is determined as follows.
[0015]
At the time of discharging electricity storage device 2, as indicated by a 20 solid line (characteristic vx) in FIG. 2, as remaining capacity of battery module 20 decreases, a value of the voltage output from electricity storage device 2 decreases. The value of the voltage output from electricity storage device 2 may be regarded as coinciding with a value of the terminal voltage of battery module 20 in a normal state. In other words, it is possible to use the output 25 value of monitor 23 received by input unit 11 as the value of the voltage output by electricity storage device 2. 7
9339772J (GHMatters) P106523.AU
[0016]
Control device 10 instructs electric power converting device 3 so as to maintain a value of the current output from electricity storage device 2 at a constant value in the normal state. That is, processing unit 13 changes content of an instruction to be provided to electric power converting device 3 according to the change of a value of a voltage measured by monitor 23 so as to maintain a current output from electricity storage device 2 to a constant current at the time of discharging electricity storage device 2. As indicated by a one-dot chain line (characteristic ix) in FIG. 2, a current output from electricity storage device 2 is maintained at a constant value in the normal state until a time tl. During this period, processing unit 13 changes an operation of electric power converting device 3 so as to decrease input impedance of electric power converting device 3 that is outer impedance of electricity storage device 2, as the value of the voltage measured by monitor 23 decreases.
[0017]
Processing unit 13 instructs electric power converting device 3 to reduce an output current of electricity storage device 2, when a value of the voltage monitored by monitor 23 reaches lower limit value Vi. That is, processing unit 13 provides an instruction to electric power converting device 3 to increase the input impedance when the value of the voltage monitored by monitor 23 reaches lower limit value Vi.
[0018]
Even if the value of the voltage monitored by monitor 23 reaches lower limit value Vi, battery module 20 still contains remaining charges. In a case where the output current of electricity storage device 2 is reduced, the 8
9339772 1 (GHMatters) P106523.AU remaining charges enable the value of the terminal voltage of battery module 20 to rise above lower limit value Vi. Through this operation, when the value of the voltage monitored by monitor 23 decreases to lower limit value Vi, output electric power of electric power converting device 3 decreases, but electric power converting device 3 can continuously output the electric power without stopping the operation. In other words, processing unit 13 determines the content of the instruction to reduce a current output from electricity storage device 2 within a range in which the electric power converting device 3 can continuously output the AC power.
[0019]
Lower limit value Vi is appropriately set according to a type of the battery module 20, a condition of using electricity storage device 2, and the like. For example, lower limit value Vi is set relatively high in a case where charging and discharging are repeated so as to maintain the remaining capacity within a range of approximately 40 to 70% in order to suppress deterioration of battery module 20. In addition, lower limit value Vi is set relatively low for the purpose of reducing the electric energy received from the electric power system in order to respond to a power saving request or the like.
[0020]
However, it is desirable that the output electric power of electric power converting device 3 gradually decrease even after the value of the voltage monitored by monitor 23 reaches lower limit value Vi. By gradually decreasing the output electric power of electric power converting device 3, a possibility that oscillation in a voltage or a current occurs in electric power system 5 is reduced. Therefore, after the value of the voltage monitored by monitor 23 reaches lower limit value Vi, processing unit 13 provides an 9
9339772_1 (GHMatters) P106523.AU instruction to electric power converting device 3 to reduce a value of an output current of electricity storage device 2 with the lapse of time.
[0021]
In the present embodiment, as indicated by a dotted line (characteristic 5 ix) in FIG. 2, after time tl when the value of the voltage (characteristic vx) monitored by monitor 23 reaches lower limit value Vi, processing unit 13 reduces a value of the current with a relatively large slope al. Thereafter, when the value of the voltage reaches reference value Vb, processing unit 13 reduces the value of the current with relatively small slope a2. That is, when 10 the value of the current up to time tl is ia and an elapsed time after time tl is t, the value of the current is al · t + ia during a period from Vi to Vb of the value of the voltage. In addition, if a time at the time of reaching the value of the voltage to Vb is t2, the value of the current after time t2 is expressed as a2 · (t -(t2 - tl)} + {al · (t2 - tl) + ia}. Here, slope al is set within a range of, for 15 example, -2 to -5, and slope a2 is set within a range of, for example, approximately 0 to -0.5.
[0022]
When the value of the voltage monitored by monitor 23 again reaches lower limit value Vi, processing unit 13 repeats the same operation. However, 20 a restriction condition is set for the repetition. The restriction condition will be described below.
[0023]
As illustrated in FIG. 3, for example, reference value Vb is set based on maximum value Vmax (> Vi) of the voltage which is a maximum value of the 25 voltage monitored by monitor 23 after the output current (characteristic ix) of electricity storage device 2 is stopped at the time of reaching the value of the 10
9339772J (GHMatters) P106523.AU voltage (characteristic vx) monitored by monitor 23 to lower limit value Vi. Here, reference value Vb is determined as η x (Vmax - Vi) + Vi. n is determined within a range of approximately 0.2 to 0.4. Reference value Vb can be appropriately determined, and the above equation is an example. For 5 example, reference value Vb may coincide with lower limit value Vi. That is, the value of the output current of electricity storage device 2 may be set so as to maintain the value of the voltage monitored by monitor 23 within a predetermined range (for example, range between lower limit value Vi and reference value Vb) of equal to or greater than lower limit value Vi. 10 [0024]
After the value of the voltage monitored by monitor 23 reaches lower limit value Vi, when the output current of electricity storage device 2 is changed as described above, the value of the terminal voltage of battery module 20 is changed as indicated by the solid line (characteristic vx) in FIG. 2. That 15 is, the value of the terminal voltage of battery module 20 rises to reference value Vb after dropping to lower limit value Vi, and drops to lower limit value Vi again. When this operation is repeatedly performed, the value of the output current of electricity storage device 2 gradually decreases. Therefore, minimum value Imin for the output current is determined in processing unit 13. 20 For example, minimum value Imin is set to 0.5 A or the like. Processing unit 13 stops operations of electricity storage device 2 and electric power converting device 3 at the time of decreasing the value of the voltage monitored by monitor 23 to lower limit value Vi (for example, at time t3 in FIG. 2), after the output current decreases to minimum value Imin. That is, minimum value Imin 25 related to the output current is the above-mentioned repetition limiting condition. 11
9339772 1 (GHMatters) P106523.AU
[0025]
In the above-described operation example, after the value of the voltage monitored by monitor 23 reaches lower limit value Vi, processing unit 13 decreases the output current of electricity storage device 2. When the value of 5 the output current decreases to minimum value Imin, discharging of electricity storage device 2 is stopped at the next time of reaching the value of the voltage to lower limit value Vi. A condition for stopping the discharging of electricity storage device 2 can use an elapsed time since the value of the output current reaches the minimum value Imin in addition to a condition that the value of the 10 voltage monitored by monitor 23 reaches lower limit value Vi. For example, a configuration in which the discharging of electricity storage device 2 is stopped at a time (for example, time t4 in FIG. 2) at which predetermined holding time T1 (for example, 30 seconds) elapses since the value of the output current reached minimum value Imin may be adopted. A configuration in which the 15 discharging of electricity storage device 2 is stopped in a case where the value of the voltage is not recovered to reference value Vb at a time at which predetermined holding time T1 elapses since the value of the output current reached minimum value Imin may be adopted. The value of the voltage including a condition that the discharging of electricity storage device 2 is 20 stopped may be a value greater than lower limit value Vi, and is not limited to reference value Vb.
[0026]
In the configuration example described above, the condition for stopping the discharging of electricity storage device 2 is determined with 25 respect to the elapsed time since the terminal voltage of battery module 20 or the output current of electricity storage device 2 reaches minimum value Imin. 12
9339772_1 (GHMatters) P106523.AU
However, the condition for stopping the discharging of electricity storage device 2 may be another condition. For example, an elapsed time from a time point (time tl) is possible to determine a timing for stopping the discharging of electricity storage device 2. The time point (time tl) is a time point at which the terminal voltage of battery module 20 monitored by monitor 23 decreases to lower limit value Vi while the current output from electricity storage device 2 is maintained constant. In addition, the discharging of electricity storage device 2 may be stopped at a time at which the value of the output current of electricity storage device 2 reaches minimum value Imin.
[0027]
In the above-described operation example, in a state where the value of the current output from electricity storage device 2 is maintained constant, when the terminal voltage of battery module 20 monitored by monitor 23 decreases to lower limit value Vi, a current decreases with a predetermined slope, and thus the terminal voltage of battery module 20 rises. Two kinds of slopes at the time of decreasing the current are alternately selected, and the larger slope is adopted in a period in which the terminal voltage of battery module 20 rises to reference value Vb, and the smaller one is adopted when the terminal voltage reaches reference value Vb.
[0028]
However, instead of alternately selecting two kinds of slopes, it is also possible to adopt three or more types of slopes. For example, a configuration in which a rule in which a relatively large slope is selected in a period in which the terminal voltage of battery module 20 rises, and a relatively small slope is selected in a period in which the terminal voltage decreases is performed, and in which the slope is changed every time rise and drop of the terminal voltage 13
9339772_1 (GHMatters) P106523.AU performed, may be adopted.
[0029]
As the above-described operation example, when control device 10 stops the operation of electric power converting device 3, since the remaining capacity of battery module 20 in electricity storage device 2 decreases, it is impossible to continuously use the electric power from electricity storage device 2. Therefore, control device 10 is configured to be able to operate electric power converting device 3 after checking that the remaining capacity of battery module 20 is recovered. For example, control device 10 is configured to enable the discharging of electricity storage device 2 if the terminal voltage of battery module 20 monitored by the monitor 23 is equal to or greater than a predetermined determination value.
[0030]
As described above, after the value terminal voltage of battery module 20 reaches lower limit value Vi, by controlling the operation of electric power converting device 3 so as to reduce the output current of electricity storage device 2, it is possible to effectively use charges stored in electricity storage device 2. It is assumed that the electric energy received from electric power system 5 is reduced by using the electric power stored in electricity storage device 2 when electric power saving is requested. In this case, at a time at which the terminal voltage of battery module 20 decreases to lower limit value Vi, when the discharging of electricity storage device 2 is stopped, there is a possibility that an operation time of load 51 is reduced. However, by the above-described operation, it is possible to extend the period in which electricity storage device 2 can be discharged. For example, in a case where the electric power saving is requested, since the period in which the electric 14
9339772_1 (GHMatters) P106523.AU power can be supplied from electricity storage device 2 to load 51 extends, it is possible for the user of load 51 to reduce disadvantages due to the electric power saving while reducing the electric energy received from electric power system 5.
[0031]
In the above-described configuration example, the terminal voltage of battery module 20 monitored by monitor 23 is used, but it is possible to use state of charge (SOS). In addition, since discharge characteristics of battery module 20 vary depending on a temperature of battery module 20, when control device 10 instructs the operation of electric power converting device 3, the content of the instruction may be changed in consideration of the temperature monitored by monitor 23.
[0032]
In the above-described configuration example, control device 10 provides an instruction to electric power converting device 3 based on the terminal voltage of battery module 20 monitored by monitor 23. Alternatively, electric power converting device 3 may monitor an output voltage of electricity storage device 2, and control device 10 may provide the instruction to electric power converting device 3 based on the output voltage. For example, in a case where an electric wire that connects electricity storage device 2 and electric power converting device 3 is relatively long, since the voltage drop due to the electric wire becomes relatively large, it is necessary to consider this voltage drop together with the voltage drop due to internal resistance of battery module 20. If the output voltage of electricity storage device 2 is monitored by electric power converting device 3, a value of the voltage obtained by subtracting the voltage drop due to the electric wire is obtained. Therefore, it is possible to 15
9339772_1 (GHMatters) P106523.AU precisely perform an instruction to electric power converting device 3, rather than using the value of the voltage monitored by monitor 23 provided in battery module 20.
[0033]
Although the above-described control device 10 can be configured by using an electronic circuit to which individual electronic components are connected, control device 10 can also be configured by using a device having a processor that is operated according to a program. This type of device may be a microcontroller, which is a device integrally having a processor and a semiconductor memory as a unit, in addition to a microprocessor (MPU) requiring a semiconductor memory as a separate component. The program may be written in advance in a read-only memory (ROM) built in control device 10, but it may be provided through an electric communication line such as the Internet and a mobile communication network. In addition, the program may be provided by using a computer readable recording medium (optical disk and semiconductor memory) or the like.
[0034]
As is clear from the above-described embodiment, storage battery control device 10 of a first aspect according to the present invention includes input unit 11, output unit 12, and processing unit 13. Input unit 11 receives the value of the voltage output from electricity storage device 2, and output unit 12 provides the operation instruction to electric power converting device 3 that converts the DC power output from electricity storage device 2 into the AC power. Processing unit 13 determines the instruction to be provided to electric power converting device 3 so as to adjust the value of the current output from electricity storage device 2. Electric power converting device 3 is 16
9339772J (GHMatters) P106523.AU interconnected with electric power system 5. When a value of the voltage received by input unit 11 decreases to predetermined lower limit value Vi in a period in which the value of the current output from electricity storage device 2 is maintained at the constant current, processing unit 13 thereafter provides 5 the instruction to electric power converting device 3 through output unit 12 so as to decrease the current output from electricity storage device 2. The current output from electricity storage device 2 decreases within the range in which electric power converting device 3 can continuously output the AC power.
[0035] 10 According to the first aspect, it is possible to use the electric power of electricity storage device 2, which could not be used by the voltage drop due to the internal impedance of electricity storage device 2, impedance of the electric wire connecting electricity storage device 2 and electric power converting device 3, and the like. Generally, in a case of outputting the constant current from 15 electricity storage device 2, when the voltage output from electricity storage device 2 decreases to lower limit value Vi, the electric power of electricity storage device 2 cannot be output unless electricity storage device 2 is charged. On the other hand, in the first aspect, since the current output from electricity storage device 2 is reduced after the voltage output from electricity storage 20 device 2 decreases to lower limit value Vi, it is possible to continuously output the electric power from electricity storage device 2. As a result, the electric energy that can be supplied from electricity storage device 2 increases when comparing with the case where the constant current is output from electricity storage device 2. In other words, even after the value of the voltage output 25 from electricity storage device 2 decreases to lower limit value Vi, by controlling electric power converting device 3 so as to output the electric power from 17
9339772 1 (GHMatters) P106523.AU electricity storage device 2, it is possible to increase the electric energy to be output from electricity storage device 2.
[0036]
In storage battery control device 10 of a second aspect according to the present invention, in addition to the first aspect, processing unit 13 provides the instruction to electric power converting device 3 to decrease the value of the current with the lapse of time in a period in which the current output from electricity storage device 2 decreases within the range in which electric power converting device 3 can continuously output the AC power.
[0037]
According to the second aspect, since the current output from electricity storage device 2 decreases as the voltage output from electricity storage device 2 decreases by decreasing the remaining capacity electricity storage device 2, it is possible to increase the electric energy that can be supplied from electricity storage device 2.
[0038]
In storage battery control device 10 of a third aspect according to the present invention, in addition to the first or second aspects, processing unit 13 determines the value of the current so that value of the voltage received by input unit 11 is maintained within a predetermined range equal to or greater than lower limit value Vi in the period in which electric power converting device 3 decreases the current output from electricity storage device 2 within the range in which the output of the AC power can continued.
[0039]
According to the third aspect, so as to maintain the value of the voltage received by input unit 11 in the vicinity of lower limit value Vi, it is possible to 18
9339772J (GHMatters) P106523.AU adjust the current to be output from electricity storage device 2, and it is possible to extend a period of outputting the electric power from electricity storage device 2 for a relatively long time.
[0040]
In storage battery control device 10 of a fourth aspect according to the present invention, in addition to one aspect of the first to third aspects, when the predetermined holding time elapses from the time point at which the value of the current output from electricity storage device 2 reaches predetermined minimum value Imin, processing unit 13 is configured to stop the discharging of electricity storage device 2.
[0041]
According to the fourth aspect, in a case where the value of the current output from electricity storage device 2 decreases to minimum value Imin, since the discharging of electricity storage device 2 is stopped after the elapse of the holding time, over discharging of electricity storage device 2 can be prevented.
[0042]
In storage battery control device 10 of a fifth aspect according to the present invention, in addition to one aspect of the first to third aspects, after the value of the current output from electricity storage device 2 reaches predetermined minimum value Imin, when the value of the voltage received by input unit 11 decreases to lower limit value Vi, processing unit 13 is configured to stop the discharging of electricity storage device 2.
[0043]
According to the fifth aspect, when the voltage output from electricity storage device 2 decreases to lower limit value Vi, since the discharging of electricity storage device 2 is stopped, it is possible to manage the remaining 19
9339772_1 (GHMatters) P106523.AU capacity of electricity storage device 2 at a relatively high precision at the time of stopping the discharging of electricity storage device 2. For example, it is easy to avoid a situation where electricity storage device 2 deteriorates more than expected in a case where the remaining capacity affects the degree of 5 deterioration of electricity storage device 2.
[0044] A storage battery system of a sixth aspect according to the present invention includes electricity storage device 2, electric power converting device 3, and storage battery control device 10. Electric power converting device 3 10 converts the DC power output from electricity storage device 2 to the AC power and is also interconnected with electric power system 5. Storage battery control device 10 receives the value of the voltage output from electricity storage device 2, and provides the operation instruction to electric power converting device 3 so as to adjust the value of the current output from 15 electricity storage device 2. When the value of the voltage received in the period in which the value of the current output from electricity storage device 2 is maintained at the constant current decreases to predetermined lower limit value Vi, storage battery control device 10 thereafter provides the instruction to electric power converting device 3 so as to decrease the current output from 20 electricity storage device 2. The current output from electricity storage device 2 decreases within the range in which electric power converting device 3 can continuously output the AC power.
[0045]
According to the sixth aspect, the same effect as that of the first aspect 25 is obtained.
[0046] 20
9339772 1 (GHMatters) P106523.AU
The above-described embodiment is an example of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and can obviously be modified in various ways according to design or the like without departing from the technical idea according to the present invention even in other than this embodiment. 21
9339772_1 (GHMatters) P106523.AU
Claims (6)
1. A storage battery control device comprising: an input unit that receives a value of a voltage output from an electricity storage device! an output unit that provides an operation instruction to an electric power converting device that converts DC power output from the electricity storage device into AC power! and a processing unit that determines the instruction to be provided to the electric power converting device so as to adjust a value of a current output from the electricity storage device, wherein the electric power converting device is interconnected with an electric power system, and when the value of the voltage received by the input unit decreases to a predetermined lower limit value in a period in which the value of the current output from the electricity storage device is maintained at a constant current, the processing unit thereafter provides the instruction to the electric power converting device through the output unit so as to decrease the current within a range in which the electric power converting device can continuously output the AC power.
2. The storage battery control device of Claim 1, wherein in a period in which the current decreases within the range in which the electric power converting device can continuously output the AC power, the processing unit provides the instruction to the electric power converting device so as to decrease the value of the current with the lapse of time.
3. The storage battery control device of Claims 1 or 2, wherein the processing unit determines the value of the current so that the value of the voltage is maintained within a predetermined range equal to or greater than the lower limit value in the period in which the electric power converting device decreases the current within the range in which the output of the AC power can be continued.
4. The storage battery control device of any one of Claims 1 to 3, wherein the processing unit is configured to stop discharging of the electricity storage device when a predetermined holding time elapses from a time point at which the value of the current reaches a predetermined minimum value.
5. The storage battery control device of any one of Claims 1 to 3, wherein the processing unit is configured to stop the discharging of the electricity storage device after the value of the current reaches a predetermined minimum value, when the value of the voltage received by the input unit decreases to the lower limit value.
6. A storage battery system comprising: an electricity storage device! an electric power converting device that converts DC power output from the electricity storage device into AC power, and is interconnected with the electric power system! and a storage battery control device that receives a value of a voltage output from the electricity storage device, and provides an operation instruction to the electric power converting device so as to adjust a value of a current output from the electricity storage device, wherein when the value of the voltage received in a period in which the value of the current is maintained at a constant current decreases to a predetermined lower limit value, the storage battery control device thereafter provides the instruction to the electric power converting device so as to decrease the current within a range in which the electric power converting device can continuously output the AC power.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-026233 | 2015-02-13 | ||
| JP2015026233A JP6566345B2 (en) | 2015-02-13 | 2015-02-13 | Storage battery control device, power storage system |
| PCT/JP2016/000459 WO2016129227A1 (en) | 2015-02-13 | 2016-01-29 | Storage battery control device and storage battery system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2016217361A1 true AU2016217361A1 (en) | 2017-08-24 |
| AU2016217361B2 AU2016217361B2 (en) | 2019-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2016217361A Active AU2016217361B2 (en) | 2015-02-13 | 2016-01-29 | Storage battery control device and storage battery system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6566345B2 (en) |
| AU (1) | AU2016217361B2 (en) |
| WO (1) | WO2016129227A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6928913B2 (en) * | 2017-08-10 | 2021-09-01 | パナソニックＩｐマネジメント株式会社 | Power generation control systems, programs, and control methods |
| CN113824166A (en) * | 2020-06-19 | 2021-12-21 | 北京小米移动软件有限公司 | Charging strategy adjusting method and device and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3900689B2 (en) * | 1998-06-22 | 2007-04-04 | ソニー株式会社 | Charging method and charging device |
| JP2013021792A (en) * | 2011-07-08 | 2013-01-31 | Sanyo Denki Co Ltd | Power supply system |
| JP6069103B2 (en) * | 2013-05-30 | 2017-01-25 | 日本リライアンス株式会社 | Battery charging / discharging device, charging / discharging method, and program |
-
2015
- 2015-02-13 JP JP2015026233A patent/JP6566345B2/en active Active
-
2016
- 2016-01-29 WO PCT/JP2016/000459 patent/WO2016129227A1/en active Application Filing
- 2016-01-29 AU AU2016217361A patent/AU2016217361B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016129227A1 (en) | 2016-08-18 |
| JP6566345B2 (en) | 2019-08-28 |
| JP2016149889A (en) | 2016-08-18 |
| AU2016217361B2 (en) | 2019-02-21 |
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