JP6324626B2 - Power supply system - Google Patents

Description

  The present invention relates to a power supply device and a power supply system including a plurality of secondary batteries.

  Conventionally, some power supply devices include a plurality of secondary batteries, and control output current from each secondary battery based on the ratio of the remaining power of each secondary battery to supply to load equipment ( See Patent Document 1 below). In order to prevent the secondary battery from being deteriorated, the power supply device performs control to increase the output current as the secondary battery has a larger remaining power.

Japanese Patent No. 5385698

  However, the secondary battery has a characteristic that the deterioration is larger as the remaining amount of electric power is larger, and the deterioration is larger as the time for which the remaining electric power is held is longer. For this reason, there is a case where a secondary battery having a large deterioration cannot be accurately detected even if only a large amount of remaining power is taken into consideration, and as a result, the life of the secondary battery may be shortened.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a power supply device capable of improving the deterioration determination accuracy of a plurality of secondary batteries and extending the life of the secondary batteries.

In order to solve the above-described problems and achieve the object, the power supply system of the present invention detects the output current value from the secondary battery, and makes the secondary battery have the target output current value so that the output current value becomes the target output current value. An output current value is obtained from the power conversion means for performing control to convert the DC power from the AC power to the AC power, the remaining power detection means for detecting the remaining power stored in the secondary battery, and the power conversion means, Measure the cumulative holding time for each set power remaining amount of the secondary battery detected by the remaining power detection means, and use the cumulative holding time and weighting factor for the set power remaining amount to calculate the secondary battery holding time conversion value A plurality of power supply devices having output current control means for calculating; The output current control means of each power supply device obtains the output current value and the hold time converted value from the output current control means of the other power supply device, and the total hold time that is the sum of the hold time converted values of each power supply device Calculate the converted value, calculate the total output current value that is the sum of the output current values of each power supply device, and use the total output current value, the own device's holding time converted value, and the total holding time converted value. The target output current value of the secondary battery is calculated.

  The power supply device according to the present invention has the effect of improving the deterioration determination accuracy of a plurality of secondary batteries and extending the life of the secondary batteries.

1 is a block diagram showing a configuration example of a power supply device according to a first embodiment; The figure which shows the transition by the elapsed time of the electric power residual amount of the secondary battery concerning Embodiment 1. FIG. The figure which shows progress until the output current ratio of a secondary battery is calculated in the output current control part concerning Embodiment 1. FIG. 6 is a flowchart showing a control process for the output current of the secondary battery in the power supply apparatus according to the first embodiment. FIG. 3 is a block diagram showing a configuration example of a power conversion unit according to the first embodiment. FIG. 2 is a block diagram showing a configuration example of an output current control unit according to the first embodiment. 1 is a diagram illustrating an example of a hardware configuration of a power supply device according to a first embodiment; 1 is a diagram illustrating an example of a hardware configuration of a power supply device according to a first embodiment; FIG. 3 is a block diagram illustrating a configuration example of a power supply system according to a second embodiment. 10 is a flowchart showing a control process for the output current of the secondary battery in the power supply device of the power supply system according to the second embodiment.

  Hereinafter, a power supply device and a power supply system according to embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a block diagram illustrating a configuration example of the power supply device 7 according to the first exemplary embodiment of the present invention. FIG. 1 shows a typical peripheral device connected to the power supply device 7. The power supply device 7 is connected to a commercial AC system power supply 9, a DC / AC converter 2 that converts DC power generated by the solar cell 1 into AC power, and a load device 8 installed in the house. The commercial AC system power supply 9 supplies AC power to the power supply device 7 and the load device 8. The DC / AC converter 2 converts the DC power generated by the solar cell 1 into AC power and supplies the AC power to the power supply device 7 and the load device 8. The power supply device 7 converts the AC power supplied from the commercial AC system power supply 9 or the DC / AC converter 2 into DC power and charges the secondary batteries 3a, 3b, 3c, and the secondary batteries 3a, 3b. , 3 c is converted into AC power and supplied to the load device 8. The load device 8 is an electric device used in a house, for example, a refrigerator, a washing machine, an air conditioner, or the like.

  Next, the configuration of the power supply device 7 will be described. The power supply device 7 includes secondary batteries 3a, 3b, 3c, which are a plurality of secondary batteries that store AC power fed from the commercial AC system power supply 9 or the DC / AC converter 2 as DC power, and a commercial AC system power supply. 9 or AC power fed from the DC / AC converter 2 is converted to DC power and output to the connected secondary battery, and DC power from the connected secondary battery is converted to AC power and fed to the load device 8 Power conversion units 4a, 4b, 4c, a remaining power detection unit 5 that detects a remaining power indicating the amount of power stored in the secondary batteries 3a, 3b, 3c, and power conversion units 4a, 4b, 4c On the other hand, an output current control unit 6 that controls power supply to the load device 8 by controlling conversion of DC power stored in the secondary batteries 3a, 3b, and 3c to AC power. In the following description, the secondary batteries 3a, 3b, and 3c may be referred to as the secondary battery 3 when not distinguished from each other, and the power converters 4a, 4b, and 4c may be referred to as the power converter 4 when not distinguished from each other.

  In the power supply device 7, the secondary battery 3 and the power conversion unit 4 are connected on a one-to-one basis. In the power supply device 7, the secondary battery 3a is connected to the power converter 4a, the secondary battery 3b is connected to the power converter 4b, and the secondary battery 3c is connected to the power converter 4c. In FIG. 1, the power supply device 7 includes three secondary batteries 3a, 3b, 3c and the same number of three power conversion units 4a, 4b, 4c as the secondary batteries 3a, 3b, 3c. Yes, it is possible to provide two secondary batteries 3 and a power converter 4 or four or more secondary batteries 3 and a power converter 4.

  The secondary batteries 3a, 3b, 3c are, for example, lithium ion batteries and the like, and charge DC power converted from AC power by the power converters 4a, 4b, 4c. Further, the secondary batteries 3a, 3b, 3c discharge the DC power stored under the control of the power conversion units 4a, 4b, 4c. The secondary batteries 3a, 3b, 3c are not limited to lithium ion batteries.

  When the secondary battery 3a, 3b, 3c is discharged, the power conversion unit 4a, 4b, 4c converts the direct current power stored in the secondary battery 3a, 3b, 3c into alternating current power and supplies the load device 8 with power. Power conversion means. The power converters 4a, 4b, and 4c are the secondary batteries 3a, 3b, and 3c so that the output current value that is the current value of the DC power output from the secondary batteries 3a, 3b, and 3c becomes the target output current value. The control which converts the direct current power from AC into alternating current power is performed. The target output current value is an output that is a control target of the output current value from each secondary battery 3a, 3b, 3c calculated by the output current control unit 6 in consideration of deterioration of the secondary batteries 3a, 3b, 3c. Current value. A method by which the output current control unit 6 calculates the target output current value will be described later.

  Moreover, when charging the secondary batteries 3a, 3b, and 3c, the power converters 4a, 4b, and 4c receive the AC power output from the DC / AC converter 2 or the commercial AC system power supply 9 as the DC power. The secondary batteries 3a, 3b, 3c are charged by converting into electric power. The power converters 4a, 4b, 4c have a built-in circuit for detecting the output current value of the DC power from the secondary batteries 3a, 3b, 3c, and the detected output current value is sent to the output current controller 6. Notice. The power conversion units 4a, 4b, and 4c detect the output current values of the secondary batteries 3a, 3b, and 3c constantly or periodically, and notify the detected output current values to the output current control unit 6.

  The remaining power detection unit 5 monitors the output voltage of the secondary batteries 3a, 3b, 3c, detects the remaining power of the secondary batteries 3a, 3b, 3c, and detects the detected secondary batteries 3a, 3b, 3c. This is a remaining power detection means for notifying the output current control unit 6 of the remaining power. The remaining power detection unit 5 detects the output voltage of the secondary batteries 3a, 3b, 3c constantly or periodically, and notifies the output current control unit 6 of the detected remaining power of the secondary batteries 3a, 3b, 3c. To do.

  The output current control unit 6 sets the remaining power of the secondary batteries 3a, 3b, and 3c notified from the remaining power detection unit 5 in a set power remaining amount that is a set power remaining amount, for example, in a fully charged state. In a state of 100% remaining power, 75% remaining power for a fully charged state, 50% remaining power for a fully charged state, and 25% remaining power for a fully charged state, This is an output current control means for measuring how long the power is maintained. The set remaining power is the remaining power of the secondary batteries 3a, 3b, and 3c whose output current control unit 6 measures the holding time. Here, the set power remaining amount 100% is intended for the state where the remaining power of the secondary batteries 3a, 3b, 3c notified from the remaining power detection unit 5 is 100%, and the set power remaining amount 75% is the remaining power. The secondary battery 3a, 3b, 3c notified from the amount detection unit 5 is intended for a state where the remaining power of the secondary batteries 3a, 3b, 3c is 75% or more, and the set power remaining amount of 50% is the secondary battery notified from the remaining power detection unit 5. 3a, 3b, 3c is targeted for a state where the remaining power of 50% or more, and the remaining power of the secondary batteries 3a, 3b, 3c notified from the remaining power detector 5 is 25%. % Or more states are targeted.

  The output current control unit 6 determines the direct current output from the secondary batteries 3a, 3b, and 3c, that is, the output current value that is the ratio of the output current value, from the relationship between the remaining power and the holding time of the secondary batteries 3a, 3b, and 3c. The ratio is calculated, and the power converters 4a, 4b, 4c connected to the secondary batteries 3a, 3b, 3c are controlled. The output current control unit 6 determines the output current of the secondary battery 3 that has a large amount of remaining power and a large amount of remaining power from the remaining power and holding time of the secondary batteries 3a, 3b, and 3c. Is controlled so as to be large.

  FIG. 2 is a diagram illustrating a transition of the remaining power of the secondary battery 3a according to the first embodiment according to the elapsed time. The horizontal axis represents time, and the vertical axis represents the remaining power. The output current control unit 6 measures the holding time when the remaining amount of power of the secondary battery 3a is 100%, 75%, 50%, 25% or more of the set power remaining amount, and the holding time at the remaining set power level. Accumulated retention time is calculated by accumulating. Here, when the remaining power level of the secondary battery 3a is in the state where the remaining set power level is 100%, the output current control unit 6 holds the remaining set power levels of 75%, 50%, and 25%. Time is also measured. Similarly, when the remaining power level of the secondary battery 3a is in the state where the set power remaining amount is 75%, the output current control unit 6 also measures the holding time when the set power remaining amount is 50% and 25%. To do. Further, when the remaining power of the secondary battery 3a is in a state where the remaining set power is 50%, the output current control unit 6 also measures the holding time when the remaining set power is 25%.

  The output current control unit 6 includes a timer that measures the holding time for each of the set power remaining amounts 100%, 75%, 50%, and 25%, for example. For example, when the remaining power of the secondary battery 3a is 60%, the output current control unit 6 counts the holding time with timers of 50% and 25% of the remaining set power, and the remaining power of the secondary battery 3a is When it is 90%, the holding time is counted by timers with a remaining set power level of 75%, 50% and 25%. The values of 100%, 75%, 50%, and 25% of the remaining set power are examples, and are not limited to these. Further, in FIG. 2, the range of about 24 hours is set as the accumulation target of the retention time. However, this is an example. The accumulation is performed before and after that, and the range until the secondary battery 3a is installed and replaced is accumulated. It may be used as a target.

  Specifically, in the case of the secondary battery 3a shown in FIG. 2, with respect to the set power remaining amount of 100%, since the holding time is only 3 hours, the cumulative holding time is 3 hours. Since there are two holding times of 1.5 hours and 6 hours for the set power remaining amount of 75%, the accumulated holding time is 1.5 + 6 = 7.5 hours. Since there are three holding times of 3 hours, 9.5 hours, and 2 hours for the remaining set power 50%, the cumulative holding time is 3 + 9.5 + 2 = 14.5 hours. Since there are three holding times of 6 hours, 14 hours, and 4 hours for the set power remaining amount 25%, the accumulated holding time is 6 + 14 + 4 = 24 hours. The output current control unit 6 also measures the retention time at each set power remaining amount from the transition of the remaining power amount as in FIG. 2 for the secondary batteries 3b and 3c, and calculates the accumulated retention time by accumulating the retention time. To do.

  FIG. 3 is a diagram illustrating a process until the output current ratio of the secondary batteries 3a, 3b, and 3c is calculated in the output current control unit 6 according to the first embodiment. For the secondary battery 3a, the output current control unit 6 calculates a value obtained by multiplying the accumulated holding time of each set power remaining amount by a weighting factor defined for each set power remaining amount, and holds the calculated value added. Calculate the time conversion value. The holding time conversion value is a value indicating the amount of holding time in consideration of the remaining electric power in each secondary battery 3 with a weight added to the accumulated holding time of the set power remaining amount having a large value. The weighting factor is set to a larger value as the set power remaining amount is larger. The output current control unit 6 stores the weight coefficient of each set power remaining amount by setting from the user or the like. In the example of FIG. 3, in the case of the secondary battery 3 a, the output current control unit 6 includes the cumulative holding time 3 × weighting factor 6 = 18 for the set power remaining amount 100% and the cumulative holding time 7. 5 × weighting coefficient 3 = 22.5, cumulative holding time 14.5 × set power remaining capacity 14.5 × weighting coefficient 1 = 14.5, and setting power remaining capacity 25%, cumulative holding time 24 × weighting coefficient 0 = 0. Therefore, the value obtained by multiplying the accumulated holding time by the weighting coefficient in each set power remaining amount is added, and 18 + 22.5 + 14.5 + 0 = 55 is calculated as the holding time conversion value. The output current control unit 6 performs the same calculation in the case of the secondary batteries 3b and 3c, and calculates 60 as the retention time converted value of the secondary battery 3b and 85 as the retention time converted value of the secondary battery 3c.

  The output current control unit 6 adds the retention time converted values of the secondary batteries 3a, 3b, and 3c and adds 55 + 60 + 85 = the total retention time converted value that is the sum of the retention time converted values of the secondary batteries 3a, 3b, and 3c. 200 is calculated. Then, the output current control unit 6 calculates the output current ratio of the secondary batteries 3a, 3b, 3c from the ratio of the holding time converted value of the secondary batteries 3a, 3b, 3c to the total holding time converted value of 200. The output current control unit 6 outputs the secondary battery 3a output current ratio = 55/200 = 27.5%, the secondary battery 3b output current ratio = 60/200 = 30%, and the secondary battery 3c output current ratio = 85/200 = 42.5% is calculated.

  Further, the output current control unit 6 receives the notification from the power conversion units 4a, 4b, and 4c as described above, and acquires the output current values of the secondary batteries 3a, 3b, and 3c. The output current control unit 6 adds the output current values acquired from the power conversion units 4a, 4b, and 4c, and calculates a total output current value that is the sum of the output current values of the secondary batteries 3a, 3b, and 3c. Then, the output current control unit 6 calculates the target output current value of the secondary batteries 3a, 3b, 3c by multiplying the total output current value by the output current ratio of the secondary batteries 3a, 3b, 3c. As a result, the output current control unit 6 increases the target output current value of the secondary battery 3 that has a large amount of remaining power and holds a large amount of remaining power for a long time.

  For example, the output current control unit 6 sets the target output current value of the first secondary battery held for the first time in the state of the first power remaining amount to the second lower than the first power remaining amount. The target output current value of the second secondary battery held for the first time in the state of the remaining power and the second time shorter than the first time in the state of the first remaining power This is larger than the target output current value of the third secondary battery.

  The output current control unit 6 notifies the power converters 4a, 4b, and 4c of the target output current values of the connected secondary batteries 3a, 3b, and 3c. The power conversion units 4a, 4b, 4c are connected so that the output current values of the connected secondary batteries 3a, 3b, 3c become the target output current values according to the target output current values notified from the output current control unit 6. Current control of the output current of the secondary batteries 3a, 3b, 3c to be performed, that is, control for converting DC power from the secondary batteries 3a, 3b, 3c into AC power.

  Next, the flow of control of the output current of the secondary batteries 3a, 3b, 3c in the power supply device 7 will be described. FIG. 4 is a flowchart of a process for controlling output currents of the secondary batteries 3a, 3b, and 3c in the power supply device 7 according to the first embodiment.

  First, the power conversion units 4a, 4b, and 4c detect the output current values of the connected secondary batteries 3a, 3b, and 3c (step S1), and notify the output current control unit 6 of the detected output current values (step S1). S2).

  The output current control unit 6 acquires the output current values of the secondary batteries 3a, 3b, 3c from the power conversion units 4a, 4b, 4c (step S3), and the acquired output current values of the secondary batteries 3a, 3b, 3c. Are added to calculate the total output current value which is the sum of the output current values of the secondary batteries 3a, 3b and 3c (step S4).

  The remaining power detection unit 5 detects the remaining power of the secondary batteries 3a, 3b, 3c (step S5), and notifies the output current control unit 6 of the detected remaining power (step S6).

  The output current control unit 6 acquires the remaining power levels of the secondary batteries 3a, 3b, and 3c from the remaining power level detection unit 5 (step S7), and regarding the acquired remaining power levels of the secondary batteries 3a, 3b, and 3c, The holding time at each set power remaining amount is measured (step S8). For the secondary batteries 3a, 3b, and 3c, the output current control unit 6 calculates a retention time converted value by using the accumulated retention time and the weighting coefficient obtained by accumulating the retention times of the respective set power remaining amounts (step S9). The holding time conversion values of the secondary batteries 3a, 3b, 3c are added to calculate a total holding time conversion value that is the sum of the holding time conversion values of the secondary batteries 3a, 3b, 3c (step S10).

  The output current control unit 6 calculates the output current ratio of the secondary batteries 3a, 3b, 3c from the ratio of the holding time converted value of the secondary batteries 3a, 3b, 3c to the total holding time converted value (step S11). The output current control unit 6 multiplies the total output current value and the output current ratio of the secondary batteries 3a, 3b, 3c to calculate the target output current value of the secondary batteries 3a, 3b, 3c (step S12). Then, the calculated target output current values of the secondary batteries 3a, 3b, 3c are notified to the connected power converters 4a, 4b, 4c (step S13).

  Then, the power conversion units 4a, 4b, and 4c acquire the target output current value from the output current control unit 6 (step S14), and connect the secondary output so as to become the target output current value according to the acquired target output current value. Current control of the output current of the batteries 3a, 3b, 3c is performed (step S15).

  In the flowchart of FIG. 4, the control process of the output current of the secondary batteries 3a, 3b, and 3c in the power supply device 7 is described in the order of steps S1 to S15. However, this is an example, and the processes of steps S1 to S4 are described. You may perform between the process of step S11 and S12, and you may perform the process of step S1-S4 and the process of step S5-S11 in parallel. In the flowchart shown in FIG. 4, the processes of steps S1 to S2 and the processes of steps S14 to S15 are the processes of the power conversion units 4a, 4b, and 4c, and the processes of steps S5 to S6 are the processes of the remaining power detection unit 5. Yes, the processes of steps S3 to S4 and the processes of steps S7 to S13 are processes of the output current control unit 6. Therefore, when the operations of the power conversion units 4a, 4b, and 4c are represented by a flowchart, the flow of steps S1, S2, S14, and S15 is obtained. Moreover, if the operation | movement of the electric power residual amount detection part 5 is represented with a flowchart, it will become the flow of step S5, S6. Further, when the operation of the output current control unit 6 is represented by a flowchart, the flow of steps S3, S4, S7 to S13 is obtained.

  Here, a configuration example of the power conversion unit 4 will be described. FIG. 5 is a block diagram of a configuration example of the power conversion unit 4 according to the first embodiment. The power conversion unit 4 is a circuit that detects the output current value described above, and a current detection unit 41 that is a current detection unit that detects an output current value from the connected secondary battery 3, and the connected secondary battery 3. A DC / AC converter 42 which is a DC / AC converter for converting the DC power from the converter into AC power and feeding the load device 8; and a DC / AC converter 2 which converts the DC power generated by the solar cell 1 into AC power. Alternatively, an AC / DC conversion unit 43 which is an AC / DC conversion means for charging a secondary battery which receives AC power output from the commercial AC system power supply 9 as input and converts the AC power into DC power for connection is provided. The DC / AC converter 42 performs control to convert DC power from the connected secondary battery 3 into AC power so that the output current value from the connected secondary battery 3 becomes the target output current value.

  A configuration example of the output current control unit 6 will be described. FIG. 6 is a block diagram of a configuration example of the output current control unit 6 according to the first embodiment. The output current control unit 6 is a holding time measurement unit that measures a holding time at each set power level for the remaining power levels of the secondary batteries 3a, 3b, and 3c detected by the remaining power level detection unit 5. And a control unit 62 that controls the power conversion units 4a, 4b, and 4c and controls the output current of the secondary batteries 3a, 3b, and 3c. The control unit 62 calculates a retention time converted value for each of the secondary batteries 3a, 3b, 3c using the retention time and the weighting coefficient in the remaining set power, and calculates the retention time converted value of the secondary batteries 3a, 3b, 3c. The total retention time converted value that is the sum of the retention time converted values of the secondary batteries 3a, 3b, 3c is calculated by addition. Further, the control unit 62 acquires the output current value from the power conversion units 4a, 4b, and 4c, and adds the output current values of the secondary batteries 3a, 3b, and 3c detected by the power conversion units 4a, 4b, and 4c. Thus, a total output current value that is the sum of the output current values of the secondary batteries 3a, 3b, and 3c is calculated. Then, the control unit 62 uses the total output current value, the holding time converted value of the secondary batteries 3a, 3b, 3c, and the total holding time converted value to obtain the target output current value of the secondary batteries 3a, 3b, 3c. calculate.

  Next, a hardware configuration for realizing each configuration of the power supply device 7 shown in FIG. 1 will be described. 7 and 8 are diagrams illustrating an example of a hardware configuration of the power supply device 7 according to the first embodiment. The secondary batteries 3a, 3b, and 3c in the power supply device 7 are the battery 91, the current detection unit 41 of the power conversion units 4a, 4b, and 4c is the current detection circuit 93, and the AC / DC conversion unit 43 is the power conversion circuit 94. . The DC / AC converters 42 of the power converters 4a, 4b, and 4c are realized by a power converter circuit 94 and a processing circuit 92. The functions of the remaining power detection unit 5, the holding time measurement unit 61 of the output current control unit 6, and the control unit 62 in the power supply device 7 are realized by the processing circuit 92. That is, the power supply device 7 detects the remaining amount of power of the secondary batteries 3a, 3b, 3c, measures the holding time at the remaining set power, calculates the target output current value, and secondary outputs according to the target output current value. A processing circuit 92 is provided for controlling the output current of the batteries 3a, 3b, 3c. Even if the processing circuit 92 is dedicated hardware, a CPU (Central Processing Unit) that executes a program stored in the memory 96, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor 95, It may be a DSP (Digital Signal Processor) or the like.

  When the processing circuit 92 is dedicated hardware, the processing circuit 92 includes, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), and an FPGA (Field Programmable Gate). Array) or a combination thereof. The functions of the respective units of the remaining power detection unit 5 and the output current control unit 6 may be realized by the processing circuit 92, or the functions of the respective units may be collectively realized by the processing circuit 92.

  When the processing circuit 92 is a CPU, the functions of the remaining power detection unit 5 and the output current control unit 6 are realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the memory 96. The processing circuit 92 realizes the functions of the respective units when the processor 95 reads and executes the program stored in the memory 96. Moreover, it can be said that these programs are what makes a computer perform the procedure and method of the electric power residual amount detection part 5 and the output current control part 6. FIG. Here, the memory 96 is, for example, non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), etc. A semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disc), and the like are applicable.

  In addition, about each function of the electric power residual amount detection part 5 and the output current control part 6, you may make it implement | achieve part by exclusive hardware and may implement | achieve part by software or firmware. For example, the function of the remaining power detection unit 5 is realized by a processing circuit as dedicated hardware, and the function of the output current control unit 6 is read and executed by the processing circuit reading and executing a program stored in the memory. It is possible to realize.

  As described above, the processing circuit 92 can realize the above-described functions by hardware, software, firmware, or a combination thereof.

  As described above, according to the present embodiment, in the power supply device 7, the output current control unit 6 uses the holding time and the weighting coefficient in each set power remaining amount for the secondary batteries 3 a, 3 b, 3 c. The holding time conversion value is calculated, and the holding time conversion values of the secondary batteries 3a, 3b, 3c are added to calculate the total holding time conversion value which is the sum of the holding time conversion values of the secondary batteries 3a, 3b, 3c. The output current values of the secondary batteries 3a, 3b, 3c are added to calculate the total output current value that is the sum of the output current values of the secondary batteries 3a, 3b, 3c, and the total output current value is added to the total holding time. The target output current values of the secondary batteries 3a, 3b, and 3c are calculated by multiplying the ratio of the retention time converted values of the secondary batteries 3a, 3b, and 3c to the converted values. Thereby, in the power supply device 7, it can control so that the output current of the secondary battery 3 becomes large, so that it keeps for a long time in the state with much electric power remaining of the secondary battery 3, and the secondary battery 3a. , 3b, 3c, the time during which the remaining amount of power is maintained can be averaged. As a result, since the secondary battery 3a, 3b, 3c can be used in a balanced manner in the power supply device 7, the deterioration of the secondary batteries 3a, 3b, 3c can be reduced, and the secondary batteries 3a, 3b, The lifetime of 3c can be extended. In the power supply device 7, it is possible to improve the deterioration determination accuracy of the secondary batteries 3a, 3b, 3c and extend the life of the secondary batteries 3a, 3b, 3c.

Embodiment 2. FIG.
In the first embodiment, one power supply device 7 includes a plurality of secondary batteries 3a, 3b, 3c. In the present embodiment, a power supply system including a plurality of power supply devices having one secondary battery 3 will be described.

  FIG. 9 is a block diagram illustrating a configuration example of the power supply system 10 according to the second exemplary embodiment of the present invention. FIG. 9 shows a typical peripheral device connected to the power supply system 10. Solar cell 1, DC / AC converter 2, load device 8, and commercial AC system power supply 9 are the same as those in the first embodiment. The power supply system 10 includes a plurality of power supply devices 7a, 7b, and 7c. In the second embodiment, the secondary battery 3a, the power conversion unit 4a, the remaining power detection unit 5a, and the output current control unit 6a constitute one power supply device 7a. Similarly, the secondary battery 3b, the power conversion unit 4b, the remaining power detection unit 5b, and the output current control unit 6b constitute one power supply device 7b. The secondary battery 3c, the power conversion unit 4c, the remaining power The detection unit 5c and the output current control unit 6c constitute one power supply device 7c. In FIG. 9, the power supply system 10 includes three power supply devices 7a, 7b, and 7c. However, the power supply system 10 is an example, and may include two power supply devices or four or more power supply devices. .

  Next, the configuration of the power supply devices 7a, 7b, and 7c will be described. Since the power supply devices 7a, 7b, and 7c have the same configuration, they will be described using the power supply device 7a. The power supply device 7a is supplied from the secondary battery 3a that stores the AC power supplied from the commercial AC system power supply 9 or the DC / AC converter 2 in the form of DC power, and from the commercial AC system power supply 9 or the DC / AC converter 2. The converted AC power is converted into DC power and output to the secondary battery 3a, the DC power from the secondary battery 3a is converted into AC power and supplied to the load device 8, and the secondary battery 3a By controlling the conversion of the DC power stored in the secondary battery 3a to AC power with respect to the power conversion unit 4a for detecting the remaining amount of power indicating the amount of power stored in And an output current control unit 6a that controls power supply to the load device 8.

  Secondary battery 3a has the same configuration as secondary battery 3a of the first embodiment. The same applies to the secondary batteries 3b and 3c.

  The power conversion unit 4a has the same configuration as that of the power conversion unit 4a of the first embodiment, but the notification destination that notifies the detected output current value of the secondary battery 3a and the notification source that receives the notification of the target output current value are output. The current control unit 6 is changed to the output current control unit 6a in the same power supply device 7a. The same applies to the power converters 4b and 4c.

  The remaining power detection unit 5a monitors the output voltage of the secondary battery 3a in the same power supply device 7a, detects the remaining power of the secondary battery 3a, and determines the detected remaining power of the secondary battery 3a. It is a remaining power detection means for notifying the output current control section 6a.

  The output current control unit 6a measures the retention time at each set remaining power level as in the first embodiment with respect to the remaining power level of the secondary battery 3a notified from the remaining power level detection unit 5a, and the secondary battery 3a. Output current control means for calculating a hold time conversion value. The calculation method of the holding time conversion value of the secondary battery 3a in the output current control unit 6a is the same as the method in which the output current control unit 6 calculates the holding time conversion value of the secondary batteries 3a, 3b, 3c in the first embodiment. It is. In the second embodiment, the output current control unit 6a calculates a holding time conversion value of the secondary battery 3a in the same power supply device 7a. As in the first embodiment, the output current control unit 6a calculates the retention time converted value 55 of the secondary battery 3a as shown in FIG.

  Similarly, the output current control unit 6b of the power supply device 7b calculates the retention time converted value 60 of the secondary battery 3b in the same power supply device 7b. In addition, the output current control unit 6c of the power supply device 7c calculates a retention time converted value 85 of the secondary battery 3c in the same power supply device 7c.

  The output current control unit 6a receives the notification from the power conversion unit 4a and acquires the output current value of the secondary battery 3a. Similarly, the output current control unit 6b receives the notification from the power conversion unit 4b and acquires the output current value of the secondary battery 3b. Moreover, the output current control part 6c receives the notification from the power conversion part 4c, and acquires the output current value of the secondary battery 3c.

  In the present embodiment, the output current control unit 6a of the power supply device 7a exchanges the output current value and the holding time converted value with the output current control units 6b and 6c of the other power supply devices 7b and 7c. . That is, the output current control unit 6a of the power supply device 7a notifies the output current control units 6b and 6c of the other power supply devices 7b and 7c of the output current value and the hold time converted value of the power supply device 7a, and the like. The output current values and holding time converted values of the other power supply devices 7b and 7c are acquired from the output current control units 6b and 6c of the power supply devices 7b and 7c.

  The output current control unit 6a adds the calculated holding time converted value 55 of the power supply device 7a, the acquired holding time converted value 60 of the power supply device 7b, and the holding time converted value 85 of the power supply device 7c to each power supply. 55 + 60 + 85 = 200 is calculated as a total holding time conversion value that is the sum of the holding time conversion values of the supply device. Then, the output current control unit 6a calculates the output current ratio of the secondary battery 3a from the ratio of 55 of the holding time converted value of the power supply device 7a which is the own apparatus to the total holding time converted value of 200. Specifically, the output current control unit 6a calculates the output current ratio = 55/200 = 27.5%.

  The output current control unit 6a receives the notification from the power conversion unit 4a, acquires the output current value of the secondary battery 3a, and acquires the output current values of the other power supply devices 7b and 7c. The output current control unit 6a adds the obtained output current values of the own device and the other power supply devices 7b and 7c, calculates a total output current value that is the sum of the output current values of the respective power supply devices, A target output current value of the secondary battery 3a is calculated by multiplying the output current value by the output current ratio of the secondary battery 3a. The output current control unit 6a notifies the power conversion unit 4a of the target output current value of the secondary battery 3a. The power conversion unit 4a controls the output current of the secondary battery 3a according to the target output current value notified from the output current control unit 6a so that the output current value of the secondary battery 3a becomes the target output current value. That is, control is performed to convert DC power from the secondary battery 3a into AC power.

  Although the power supply device 7a has been described, the same processing is performed in the power supply devices 7b and 7c.

  Next, the flow of control of the output current of the secondary battery in each power supply device of the power supply system 10 will be described. FIG. 10 is a flowchart illustrating the control process of the output current of the secondary battery in the power supply device of the power supply system 10 according to the second embodiment. Although the description will focus on the configuration of the power supply device 7a, it is assumed that the same processing is performed in the other power supply devices 7b and 7c.

  First, the power conversion unit 4a detects the output current value of the connected secondary battery 3a (step S21), and notifies the detected output current value to the output current control unit 6a (step S22). The output current control unit 6a acquires the output current value of the secondary battery 3a from the power conversion unit 4a (step S23).

  The remaining power detection unit 5a detects the remaining power of the secondary battery 3a (step S24) and notifies the output current control unit 6a of the detected remaining power (step S25).

  The output current control unit 6a acquires the remaining power level of the secondary battery 3a from the remaining power level detection unit 5a (step S26), and the retention time at each set remaining power level for the acquired remaining power level of the secondary battery 3a. Is measured (step S27). The output current control unit 6a calculates a retention time converted value for the secondary battery 3a using the accumulated retention time obtained by accumulatively adding the retention times of the remaining amounts of set power and weighting factors (step S28).

  The output current control unit 6a exchanges the output current value and the hold time converted value with the output current control units 6b and 6c of the other power supply devices 7b and 7c (step S29). Specifically, the output current control unit 6a of the power supply device 7a notifies the output current control units 6b and 6c of the other power supply devices 7b and 7c of the output current value and the hold time converted value of the power supply device 7a. Then, the output current values and holding time converted values of the other power supply devices 7b and 7c are acquired from the output current control units 6b and 6c of the other power supply devices 7b and 7c.

  The output current control unit 6a calculates the total output current value by adding the output current values of the power supply device 7a and the other power supply devices 7b and 7c (step S30). Further, the output current control unit 6a calculates the total holding time conversion value by adding the holding time conversion values of the power supply device 7a and the other power supply devices 7b and 7c (step S31).

  The output current control unit 6a calculates the output current ratio of the secondary battery 3a from the ratio of the hold time converted value of the secondary battery 3a to the total hold time converted value (step S32). The output current control unit 6a multiplies the total output current value by the output current ratio of the secondary battery 3a to calculate the target output current value of the secondary battery 3a (step S33), and calculates the calculated secondary battery 3a. The target output current value is notified to the power converter 4a (step S34).

  Then, the power conversion unit 4a acquires the target output current value from the output current control unit 6a (step S35), and according to the acquired target output current value, the output current of the secondary battery 3a is set to the target output current value. Current control is performed (step S36).

  In the flowchart of FIG. 10, the control process of the output current of the secondary battery in each power supply device of the power supply system 10 has been described in the order from steps S21 to S36. However, the process is an example, and the processes of steps S21 to S23 are described. You may perform between the process of step S28 and S29, and you may perform the process of step S21-S23, and the process of step S24-S28 in parallel. In the flowchart shown in FIG. 10, the processes of steps S21 to S22 and the processes of steps S35 to S36 are the processes of the power conversion unit 4a, the processes of steps S24 to S25 are the processes of the remaining power detection unit 5a, and step S23. These processes and the processes of steps S26 to S34 are processes of the output current control unit 6a. Therefore, when the operation of the power conversion unit 4a is represented by a flowchart, the flow of steps S21, S22, S35, and S36 is obtained. Moreover, when the operation of the remaining power detection unit 5a is represented by a flowchart, the flow of steps S24 and S25 is performed. Further, when the operation of the output current control unit 6a is represented by a flowchart, the flow of steps S23 and S26 to S34 is obtained.

  The power conversion units 4a, 4b, and 4c can be configured by the current detection unit 41, the DC / AC conversion unit 42, and the AC / DC conversion unit 43 shown in FIG. Further, the output current control units 6a, 6b, and 6c can be configured by the holding time measuring unit 61 and the control unit 62 shown in FIG. 6 as in the first embodiment. In the second embodiment, the control unit 62 exchanges the output current value and the holding time converted value with the control unit 62 of another power supply device.

  As described above, according to the present embodiment, in the power supply system 10, the output current control units 6a, 6b, 6c of the power supply devices 7a, 7b, 7c The holding time converted value is calculated using the holding time and weighting factor in the remaining set power, the output current value and the holding time converted value are exchanged with other power supply devices, and the own device and other power supply devices The total holding time conversion value that is the sum of the holding time conversion values of each power supply device is calculated by adding the holding time conversion values of the power supply devices, and the output current values of the own device and other power supply devices are added to each By calculating the total output current value, which is the sum of the output current values of the power supply device, and multiplying the total output current value by the ratio of the holding time converted value of the secondary battery 3 of the own device to the total holding time converted value. The target output current value of the secondary battery 3 of its own device Calculation was that. Thereby, the effect similar to Embodiment 1 can be acquired. In the second embodiment, each power supply device includes a remaining power detection unit and an output current control unit. As a result, in a power supply system including a plurality of power supply devices, it is possible to connect any number of power supply devices having the same configuration, so the total capacity of the secondary battery can be freely selected, and expansion after the start of operation Correspondence becomes easy.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 Solar cell, 2 DC / AC converter, 3a, 3b, 3c Secondary battery, 4, 4a, 4b, 4c Power conversion unit, 5, 5a, 5b, 5c Remaining power detection unit, 6, 6a, 6b, 6c Output current control unit, 7, 7a, 7b, 7c Power supply device, 8 load device, 9 commercial AC system power supply, 10 power supply system, 41 current detection unit, 42 DC / AC conversion unit, 43 AC / DC conversion unit, 61 holding Time measuring unit, 62 control unit.

Claims (1)

A power conversion means for detecting an output current value from the secondary battery and performing control to convert the DC power from the secondary battery into AC power so that the output current value becomes a target output current value;
A remaining power detection means for detecting a remaining power stored in the secondary battery;
Get the output current value from the power converter means, the cumulative retention time for each set power remaining amount of the secondary battery detected by the remaining power detector unit to measure the cumulative retention in the set remaining power Output current control means for calculating a retention time converted value of the secondary battery using time and a weighting factor;
A plurality of power supply devices having
The output current control means of each power supply device obtains the output current value and the hold time converted value from the output current control means of another power supply device, and is a total sum of the hold time converted values of each power supply device. A holding time conversion value is calculated, and a total output current value that is a sum of output current values of each power supply device is calculated, and the total output current value, the holding time conversion value of the own device, and the total holding time conversion A target output current value of the secondary battery is calculated using the value;
A power supply system characterized by that.

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