JP7255086B2 - Charge/Discharge Distribution Control Device, Charge/Discharge Distribution Control System, and Charge/Discharge Distribution Control Method - Google Patents

Description

The present invention relates to a charge/discharge distribution control device, a charge/discharge distribution control system, and a charge/discharge distribution control method.

Conventionally, in a system using storage batteries, one control device controls one storage battery. For example, the control device performs charging/discharging control of one storage battery in response to a request regarding charging/discharging.

In recent years, due to the increase in size of storage battery systems, a system in which one control device controls a plurality of storage batteries has emerged (Patent Document 1). In the invention disclosed in Patent Document 1, one control device controls a plurality of batteries. Here, the control device can individually control the charge/discharge amount of each storage battery to be controlled. At this time, the charge/discharge amount allocated to each storage battery is determined from the efficiency of the storage battery and the state of deterioration of the battery based on the SOC (State of Charge).

JP 2014-171335 A

However, the deterioration rate of the storage battery is also affected by the temperature of the storage battery in addition to the SOC. Moreover, in the storage battery system in the above patent document, the storage batteries are all of the same type and installed at the same location. Therefore, when batteries of different types coexist in a storage battery system, the control device cannot allocate the charge/discharge amount to each storage battery according to the state of deterioration thereof. In addition, in the above patent document, it is assumed that the storage batteries are installed in the same place. cannot be distributed according to the state of each storage battery.

On the other hand, in recent years, attempts have been made to integrate and control a plurality of distributed storage batteries. In this case, the storage batteries may be installed in places with different climates, such as Hokkaido and Kyushu. By uniformly controlling these storage batteries, deterioration of storage batteries installed in areas with relatively high temperatures is accelerated. Moreover, even if the storage batteries are installed in the same place, different types of storage batteries progress in different degrees of deterioration even at the same temperature. Moreover, even if the same battery is installed at the same location, the internal Joule heat caused by charging and discharging causes a difference in temperature, which causes a change in the rate of deterioration.

An object of the present invention is to extend the life of storage batteries in a storage battery system including a plurality of storage batteries.

A charge/discharge distribution control device that receives a charge/discharge request amount and transmits a charge/discharge command to a plurality of power storage units including storage batteries that are interconnected to a power system via a power converter. A rate determining unit, a charging/discharging amount calculating unit, and a charging/discharging command unit are provided. The deterioration rate deriving unit obtains the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery. The distribution rate determining section receives an output signal from the deterioration rate deriving section and sets a larger distribution rate for a storage battery with a lower deterioration rate. The charge/discharge amount calculation unit receives the output signal from the allocation rate determination unit, compares each value obtained by multiplying the charge/discharge request amount by the allocation rate of each storage battery with the maximum charge/discharge amount of each storage battery, Calculate the charge/discharge command value of the storage battery. The charge/discharge command section receives an output signal from the charge/discharge amount calculation section, and transmits a charge/discharge command based on a charge/discharge command value to each of the plurality of power storage units.

By minimizing the deterioration of each storage battery under different types and different environments, it is possible to extend the life of each storage battery.

FIG. 3 is a diagram showing an example of the relationship between the temperature of a storage battery and the rate of deterioration; It is a figure which shows transition of the internal temperature of a storage battery. It is a figure which shows an example of a structure of the charge/discharge distribution control system which concerns on 1st-7th embodiment. It is a figure which shows an example of the functional block of the charge/discharge distribution control apparatus which concerns on 1st, 3rd, 4th, and 6th embodiment. It is a figure which shows an example of the hardware constitutions of the charge/discharge distribution control apparatus which concerns on 1st-6th embodiment. FIG. 5 is a diagram showing an example of the flow of processing performed by the charge/discharge distribution control devices according to the first, third to seventh embodiments; It is a figure for demonstrating the distribution rate determination process by a charge/discharge distribution control apparatus. It is a figure which shows an example of the functional block of the charge/discharge distribution control apparatus which concerns on 2nd-4th, 6th embodiment. FIG. 7 is a diagram showing an example of the flow of processing performed by the charge/discharge distribution control devices according to the second to seventh embodiments; It is a figure for demonstrating the priority determination process by a charge/discharge distribution control apparatus. FIG. 3 is a diagram showing the relationship between the internal temperature of a storage battery, the SOC, and the rate of deterioration in a plane. It is a figure which shows an example of the functional block of the charge/discharge distribution control apparatus which concerns on 5th, 6th embodiment. It is a figure which shows an example of the storage battery information in 6th Embodiment. FIG. 13 is a diagram showing an example of functional blocks of a charge/discharge distribution control device according to a seventh embodiment; FIG. 11 is a diagram showing an example of an image displayed by a display unit of a charge/discharge distribution control device according to a seventh embodiment; It is a figure which shows an example of the hardware constitutions of the charge/discharge distribution control apparatus which concerns on 7th Embodiment. FIG. 20 is a diagram showing an example of the configuration of a charge/discharge distribution control system according to an eighth embodiment; FIG. 23 is a diagram showing an example of functional blocks of a higher-level control device and each lower-level control device in an eighth embodiment; FIG. 21 is a diagram illustrating an example of a hardware configuration of a higher-level control device or a lower-level control device according to an eighth embodiment; FIG. FIG. 14 is a sequence diagram showing an example of processing performed by a higher-level control device and a lower-level control device according to the eighth embodiment; FIG. 22 is a diagram showing an example of information stored in a storage unit of a lower control device in the eighth embodiment; FIG. FIG. 22 is a diagram showing an example of information stored in a storage unit of a host controller in the eighth embodiment; FIG.

(First embodiment)
The charge/discharge distribution control system according to the present embodiment allocates a large charge/discharge amount (charge/discharge amount of electricity) to a storage battery having a lower deterioration rate than others among the plurality of storage batteries provided in the system. , to delay the progression of deterioration of the system as a whole. Here, since the deterioration rate is an amount that varies depending on the internal temperature of the storage battery, the charge/discharge distribution control device in the charge/discharge distribution control system according to the present embodiment obtains the deterioration rate of each storage battery from the internal temperature of each storage battery. , based on which the charge/discharge is distributed to each storage battery.

FIG. 1 is a diagram showing an example of the relationship between the temperature of a storage battery and the rate of deterioration. As shown in FIG. 1, the rate of deterioration of a storage battery generally increases as the internal temperature increases. Here, storage batteries A, B, and C are storage batteries of different types. As shown in FIG. 1, the rate of deterioration differs depending on the type of storage battery even under the same temperature. In addition, the magnitude of change (slope) in deterioration rate with respect to change in internal temperature is also different for each storage battery. In FIG. 1, the relationship between the internal temperature and the deterioration rate of each storage battery is shown as being approximated by a linear expression, but it is not limited to this, and may be approximated by a secondary or cubic expression, for example. or may be represented in tabular form or the like. In the following description, the relationship between the deterioration rate and the internal temperature of each battery is expressed by a formula, and this relational expression between the internal temperature and the deterioration rate is called a characteristic formula (or a first characteristic formula). This characteristic formula is held by a charge/discharge distribution control device, which will be described later. Further, the correspondence between the internal temperature and the like of the storage battery and the deterioration rate like this characteristic formula is also called the deterioration rate characteristic. The characteristic formula is a known one that is predetermined for each storage battery.

Here, a method for measuring the internal temperature of the storage battery will be described. In this embodiment, it is assumed that the temperature measuring device is arranged at the place where the storage battery is installed. In this embodiment, a case is considered in which a temperature measuring device is arranged for each storage battery. However, it is not limited to this, and one temperature measuring device may be provided for a plurality of storage batteries in the same location. The value obtained by the temperature measuring device may be appropriately corrected for each storage battery depending on the state of the temperature.

Each temperature measuring device may be provided in contact with the storage battery to measure the external temperature of the storage battery, or may be provided spaced apart from the storage battery to obtain the ambient temperature of the storage battery. Alternatively, each temperature measuring device may be built in the storage battery and measure the temperature inside the storage battery. The temperature measuring device according to this embodiment measures the ambient temperature of the storage battery.

As described above, the temperature obtained by the temperature measuring device may not be the internal temperature of the storage battery. However, it is the internal temperature of the storage battery that affects the deterioration rate of the storage battery. Therefore, by correcting the temperature measured by each temperature measuring device, an estimated value of the internal temperature of the storage battery is obtained. This processing is performed by the charge/discharge distribution control device.

FIG. 2 is a diagram showing changes in the internal temperature of the storage battery. What is shown in the upper diagram of FIG. 2 is the temporal change in the internal temperature of the storage battery. The measurement point temperature in the upper diagram of FIG. 2 is the air temperature at the location where the storage battery is installed, which is measured by the temperature measurement device.

The lower diagram in FIG. 2 is a diagram showing when an arbitrary storage battery is not charged or discharged, at what timing charging and discharging is started, at what period charging and discharging is continued, and at what timing charging and discharging is completed. is. As shown in the lower part of FIG. 2, the storage battery is not charged or discharged during the period a, and charging/discharging of the storage battery is started at time t0 on the boundary between the periods a and b. In period b, the storage battery continues charging and discharging, and charging and discharging is stopped at time t1 on the boundary between period b and period c. Moreover, the storage battery is not performing the charging/discharging process in the period c.

Referring to the upper diagram corresponding to the lower diagram of FIG. 2, period a is a period in which the inside of the storage battery and the surrounding environment are in a state of thermal equilibrium, and the internal temperature of the storage battery is close to or equal to the measurement point temperature. Equal and without significant variation. When the charging/discharging process starts at time t0, the internal temperature of the storage battery begins to rise due to Joule heat generated inside. Then, the internal temperature of the storage battery rises during the period b. When the charging/discharging process is stopped at time t1, the internal temperature of the storage battery begins to drop, and during period c, the internal temperature continues to drop until it reaches the measurement point temperature or a temperature close to it. Therefore, the internal temperature of the storage battery is defined by the following equation (1), and the charge/discharge distribution control device uses this equation (1) to obtain the internal temperature of the storage battery.

Internal temperature of storage battery=Measurement point temperature+f(x, y, z1, z2) (1)

Here, x: elapsed time from the latest charge/discharge start point to the present time, y: elapsed time from the latest charge/discharge end point to the present point, z1: charge/discharge amount per unit time in the latest charge/discharge process, z2 : Charge/discharge amount per unit time in the previous charge/discharge treatment.

Formula (1) will be described in detail. The first term is provided because the internal temperature of the storage battery rises due to the temperature of the installation environment. The function f of the second term is a function determined by the type of storage battery, and is determined prior to calculation of the internal temperature of the storage battery by a charge/discharge distribution control device, which will be described later. How to determine this function will be described later. The second term of the formula (1) will be described separately for the case where charging/discharging is currently being performed and the case where it is not.

When charging/discharging is being performed, the internal temperature of the storage battery rises according to the length of time x from the latest charging/discharging start point to the present time. Therefore, the value of the second term increases as the value of x increases.

Also, it is conceivable that a sufficient amount of time has not passed since the previous charging/discharging process, and the internal temperature of the storage battery has not approached the measurement point temperature. For this reason, y is used as an index indicating how much the inside of the storage battery has been cooled since the end of the previous charge/discharge. Therefore, the value of the second term decreases as the value of yx increases. That is, the larger the value of y, the smaller the value of the second term.

Also, as the charge/discharge amount per unit time increases, the internal temperature of the storage battery rises, so the value of the second term increases as the value of z1 increases. As a parameter, instead of z1, the charge/discharge amount accumulated from the charge/discharge start point to the current point may be used.

Also, depending on the magnitude of the previous charge/discharge amount from the previous charge/discharge end time to the present time, it is conceivable that the internal temperature of the storage battery may not drop sufficiently during the period yx, so the internal temperature can be obtained accurately. Therefore, z2 is used as a parameter. The larger the value of z2, the larger the value of the second term.

On the other hand, x, y, z1, and z2 when charging and discharging are not performed in the storage battery at present will be described. x corresponds to the time from the start of the immediately preceding charge/discharge process to the current time.

Also, y is the elapsed time from the end of the immediately preceding charge/discharge process to the present time. The longer this time is, the closer the internal temperature is to the measuring point temperature. Therefore, the larger the value of y, the smaller the value of the second term.

Also, xy is the duration of the last charging/discharging process, and the longer this time, the slower the decrease in the internal temperature of the storage battery. Therefore, the larger the value of x, the larger the value of the second term.

Also, z1 is the charge/discharge amount per unit time in the immediately preceding charge/discharge process. The larger this value, the slower the internal temperature will drop, so the larger the value of z1, the larger the value of the second term.

z2 is the charge/discharge amount per unit time in the charge/discharge process before the latest charge/discharge process. may be higher. Therefore, the larger the value of z2, the larger the value of the second term.

If the charge/discharge amount per unit time is the rated amount, only x and y may be used as parameters for f. In addition, time other than x and y, such as "elapsed time from the previous charging/discharging start point to the present time" or "elapsed time from the previous charging/discharging end point to the present time", may be included in the parameter of f. good.

The function f of each storage battery is determined in advance prior to charge/discharge processing. For example, f may be obtained from the material and volume of the housing surrounding the internal structure of the storage battery. In addition, the time required for thermal equilibrium is measured to determine how long it takes for the external temperature of the storage battery that has been charged and discharged for a certain period of time to approach the installation point temperature, and f may be determined using this. . Alternatively, f may be determined as follows. First, f can be obtained by determining a model to determine a differential equation, solving this to obtain a solution curve, and synthesizing basis functions based on this solution curve. Alternatively, f may be determined by using regression analysis on the temperature transition data as shown in FIG.

The internal temperature of the storage battery can be obtained from the measurement point temperature by equation (1), and the deterioration rate of each storage battery can be obtained from the internal temperature of each storage battery and the first characteristic equation. Based on the deterioration rate of each storage battery, the ratio of charge/discharge distribution of each storage battery (referred to as distribution ratio) is obtained. In this embodiment, the largest allocation rate is set for the storage battery with the lowest deterioration rate.

In addition, in the present embodiment, the internal temperature of the storage battery is obtained by the formula (1), but it is not limited to this. For example, the internal temperature of a storage battery may be obtained from the charge/discharge power amount (magnitude of charge/discharge power) taken out from the storage battery or the internal resistance of the storage battery. Here, the measurement of the internal resistance is performed, for example, by fully discharging the storage battery after being fully charged, and measuring the current and power output at that time. This internal resistance measurement is periodically performed at a timing other than when the storage battery is in operation. Then, the charge/discharge distribution control device acquires the internal resistance of each storage battery prior to operating the storage battery. Using this internal resistance and the current output during operation, the charge/discharge power amount may be obtained, and the internal temperature of the storage battery may be obtained from this. In addition, the internal resistance of the storage battery may be obtained using the measured voltage and current.

(Description of components)
FIG. 3 shows an example of a system configuration of a charge/discharge distribution control system 1A according to this embodiment. The charge/discharge distribution control system 1A includes one charge/discharge distribution control device 2A, a plurality of storage batteries 3, the same number of temperature measuring devices 4 as the storage batteries, and the same number of PCSs (Power Conditioning Systems) 5 as the storage batteries 3. Each temperature measuring device 4 is provided for each storage battery 3 , and each PCS 5 is provided for each storage battery 3 .

2 A of charge/discharge distribution control apparatuses are connected to each storage battery 3 via each PCS5. Moreover, each storage battery 3 is connected to the power system via each PCS 5, and performs charge/discharge processing based on instructions from the charge/discharge distribution control device 2A. Each device included in the charge/discharge distribution control system 1A will be described in more detail below.

The charge/discharge distribution control device 2A receives a charge/discharge request from a host device (not shown in FIG. 3). At this time, the charge/discharge distribution control device 2A acquires the amount (also referred to as the charge/discharge request amount) that must be charged/discharged by the entire charge/discharge distribution control system 1A from the host device.

It should be noted that the charge/discharge distribution control device 2A may determine the charge/discharge request amount by a control logic that exists separately inside itself instead of receiving the charge/discharge request from the host device. More specifically, for example, the charge/discharge distribution control device 2A stores information such as "how much charge/discharge amount is required at what time" in a tabular form or the like, and uses this information to determine the charge/discharge amount. may decide.

The charge/discharge distribution control device 2A stores the function f of each storage battery 3 . The charge/discharge distribution control device 2A also detects whether each storage battery 3 is in a charged/discharged state or not, and measures the time during which each storage battery 3 is being charged/discharged and the time during which it is not being charged/discharged. The charge/discharge distribution control device 2A also stores the above-described x and y obtained by measuring this time. The charge/discharge distribution control device 2A may acquire the current charge/discharge amount per unit time of each storage battery 3 from each PCS 5 via the communication unit 20 (FIG. 4). Then, the charge/discharge distribution control device 2A stores the charge/discharge amount per unit time of each storage battery 3 in the latest charge/discharge process as z1 and the charge/discharge amount in the previous charge/discharge process as z2. do.

Furthermore, the charge/discharge distribution control device 2A acquires the above-described measurement point temperature from each temperature measurement device 4 . Then, the charge/discharge distribution control device 2A obtains the internal temperature of each storage battery 3 using the measurement point temperature for each storage battery 3, x, y, z1, z2, and the function f.

The charge/discharge distribution control device 2A obtains the deterioration rate of each storage battery 3 by substituting the obtained internal temperature of each storage battery 3 into the first characteristic expression of each storage battery 3 . Then, based on the deterioration rate of each storage battery 3, the allocation ratio of each storage battery 3 is determined. A method of calculating this distribution ratio will be described later.

As will be described later, the charge/discharge distribution control device 2A determines the amount of electricity charged/discharged by each storage battery 3 (also referred to as charge/discharge distribution amount) based on the charge/discharge request amount and the distribution rate.

The charge/discharge distribution control device 2A issues a charge/discharge instruction (also referred to as a charge/discharge instruction) to the storage battery 3 whose charge/discharge distribution amount is greater than zero. The charge/discharge command includes information on the charge/discharge amount (also referred to as charge/discharge command value) to be charged/discharged for the storage battery 3 . The charge/discharge command value is the total amount of charge/discharge that the storage battery 3 continuously charges/discharges for a certain period of time (time required for one charge/discharge process). In the present embodiment, the charge/discharge command value is equal to the charge/discharge distribution amount finally determined by the charge/discharge amount calculator 223A (FIG. 4) described later.

The charge/discharge distribution control device 2A may issue a charge/discharge command to all the storage batteries 3 including the storage battery 3 with a charge/discharge command value of zero. In this case, the charge/discharge distribution control device 2A may notify the storage battery 3 with the charge/discharge command value of 0 as the charge/discharge command value of 0.

The plurality of storage batteries 3 may include different types of storage batteries 3 . Each storage battery 3 performs charge/discharge processing according to the charge/discharge command from the charge/discharge distribution control device 2A, and performs charge/discharge processing according to the charge/discharge command value from the charge/discharge distribution control device 2A.

The temperature measuring device 4 measures the ambient temperature (measurement point temperature) of the storage battery 3 in which it is provided. Then, the temperature measurement device 4 notifies the charge/discharge distribution control device 2A of the measured measurement point temperature based on an instruction from the charge/discharge distribution control device 2A or automatically. Alternatively, the temperature measuring device 4 may store the formula (1), determine the internal temperature of the storage battery 3 based on the temperature at the measuring point measured by itself, and notify the charge/discharge distribution control device 2A.

The PCS 5 causes the storage battery 3 to charge and discharge based on the charge and discharge command from the charge and discharge distribution control device 2A. When the storage battery 3 is discharged, the PCS 5 converts the direct current output by the storage battery 3 into an alternating current, and outputs the alternating current to a load device (not shown) of the electric power system. When charging the storage battery 3 , the PCS 5 converts alternating current input from the power system into direct current and outputs the direct current to the storage battery 3 .

All or part of the above-described PCS 5 and storage battery 3 set may be installed at the same place, or may be installed at one or more separate places.

Here, the combination of the storage battery 3 and the power converter is also referred to as a power storage unit 6 . The power converter is a device that converts the direct current output by the storage battery 3 into an alternating current, and performs processing such as charging and discharging the storage battery 3 based on the charge/discharge command from the charge/discharge distribution control device 2A. , and PCS5 described above are examples thereof.

Note that the charge/discharge distribution control device 2A may be connected to the power storage unit 6 via a wired or wireless communication network such as the Internet or an intranet.

FIG. 4 shows an example of functional blocks of the charge/discharge distribution control device 2A. 2 A of charge/discharge distribution control apparatuses are provided with the communication part 20, the memory|storage part 21, and 22 A of control parts. The control unit 22A also includes a time measuring unit 220, a deterioration speed deriving unit 221, a distribution ratio determining unit 222A, and a charge/discharge amount calculating unit 223A.

The communication unit 20 transmits information necessary for processing by the charge/discharge distribution control device (the charge/discharge distribution control device 2A according to the present embodiment and the charge/discharge distribution control device according to the following embodiments) to the host device, each PCS 5, each temperature Acquired from the measuring device 4 or the like.

In this embodiment, the communication unit 20 receives a charge/discharge request from a host device and notifies the control unit 22A.

Also, the communication unit 20 acquires the measurement point temperature from each temperature measuring device 4 and outputs it to the control unit 22A.

Further, the communication unit 20 acquires information as to whether or not charging/discharging is being performed from each storage battery 3, and notifies the control unit 22A of this.

Also, the communication unit 20 acquires values of z1 and z2 from each storage battery 3 . However, this operation is not necessary when each storage battery 3 charges and discharges at the rated value. In this case, a storage unit 21, which will be described later, stores the charging/discharging amount per unit time of each storage battery 3 at its rating.

Furthermore, the communication unit 20 issues a charge/discharge command to the above-described power storage unit 6 (PCS 5) according to the charge/discharge command value for each storage battery 3 determined by the control unit 22A.

Note that a charge/discharge distribution control device (a charge/discharge distribution control device 2A according to the present embodiment or a charge/discharge distribution control device exemplified by the following charge/discharge distribution control device) issues a charge/discharge command to the storage unit 6. is called a charge/discharge command unit, the charge/discharge command unit in this embodiment corresponds to the communication unit 20 . Note that the method of notifying the charge/discharge command to the storage unit 6 by the charge/discharge command unit may be different from or the same as the method of exchanging information between the host device, the temperature measuring device 4, and the like.

If the charge/discharge distribution control device 2A communicates with each of the host device or the like and the power storage unit 6 by different methods, the functional block exemplified as the communication unit 20 in this embodiment may A plurality of communication units (also referred to as sub-communication units) corresponding to the method may be provided inside, and some of these sub-communication units are provided outside the communication unit 20 of the charge/discharge distribution control device 2A. may Among them, the one having the function of issuing a charge/discharge command to the storage unit 6 corresponds to the charge/discharge command section.

The storage unit 21 stores the formula (1) and the characteristic formula of each storage battery 3 . In addition, the storage unit 21 stores the values of x, y, z1 and z2 of each storage battery 3 . The storage unit 21 also stores the charge/discharge request amount. The storage unit 21 also stores the maximum charge/discharge amount, which is the upper limit of the charge/discharge amount of each storage battery 3 . Note that the storage unit 21 may store data in tabular form or the like in which the internal temperature of each storage battery 3 is associated with the deterioration rate instead of the characteristic formula. The content of the data is included in the deterioration rate characteristics.

Next, each functional block of the control section 22A will be described. The time measuring unit 220 measures the charging/discharging processing time and the non-charging/discharging time of each storage battery 3 and stores the obtained times in the storage unit 21 . This information is, for example, x and y as described above. However, times other than x and y may be stored.

Further, the deterioration rate derivation unit 221 calculates the measurement point temperature obtained from each temperature measuring device 4 and x, y, z1 stored in the storage unit 21 for the equation (1) of each storage battery 3 stored in the storage unit 21 , z2 to obtain the internal temperature of each storage battery 3 . Then, the deterioration rate derivation unit 221 substitutes the determined value of the internal temperature of each storage battery 3 into the characteristic formula stored in the storage unit 21 to obtain the deterioration rate of each storage battery 3 . Derivation of the deterioration rate of each storage battery 3 by the deterioration rate derivation unit 221 may be performed based on data or the like that associates the internal temperature of each storage battery 3 with the deterioration rate instead of the characteristic formula.

222 A of allocation ratio determination parts determine the allocation ratio of each storage battery 3 based on the deterioration rate of each storage battery 3. FIG. This determination process will be described in more detail. Here, the allocation rate of a certain storage battery 3 is defined as shown in Examples 1 and 2 below.

Example 1
Allocation rate of storage battery 3 = (1/degradation speed of storage battery 3)/{Σ(1/degradation speed of storage battery 3)}
Here, the denominator is the total sum of "1/deterioration rate of storage battery 3" of all storage batteries 3 to which charging/discharging processing is to be distributed.

Example 2
Distribution rate of storage battery 3 = Point of storage battery 3 Here, the point is a value assigned to each storage battery 3 to be allocated in the charge/discharge process, and corresponds to the ratio of the charge/discharge amount of each storage battery 3 to the charge/discharge request amount. value. A larger value of points is assigned to a storage battery 3 with a lower deterioration rate. The points are, for example, values assigned in order of 5 points, 4 points, 3 points, .

The charge/discharge amount calculation unit 223A obtains the charge/discharge allocation amount of the storage battery 3 using the received charge/discharge request amount, the determined allocation ratio of each storage battery 3, and the maximum charge/discharge amount of the storage battery 3, which will be described later.

FIG. 5 shows an example of the hardware configuration of a charge/discharge distribution control device 2A according to this embodiment. The charge/discharge distribution control device 2A includes a processor 70, a memory 71, a storage device 72, and a communication device 73. FIG.

Processor 70 includes, for example, a single-core, dual-core, or multi-core processor.

The memory 71 is, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), or a semiconductor memory.

The processor 70 reads the information stored in the storage device 72 into the memory 71 and executes the program in the memory 71, thereby realizing the functions of the control unit 22 described above.

The storage device 72 is a hard disk drive, an optical disk device, or the like, and may be an external storage device or a portable storage medium. The storage device 72 implements the function of the storage unit 21 .

The communication device 73 is for wired or wireless exchange of information between the host device and each PCS 5 and the charge/discharge distribution control device 2A, and includes an interface for communication. Further, when the communication method with the higher-level device and the communication method with the power storage unit 6 are different, the communication device 73 may internally include a communication device (also referred to as a sub-communication device) corresponding to each communication method. good. Also, the charge/discharge distribution control device 2A may include some of these sub-communication devices outside the communication device 73 .

The function of the communication unit 20 is realized by the communication device 73 .

Note that the charge/discharge distribution control device 2A is preferably a PLC (Programmable Logic Controller), for example.

(action)
FIG. 6 is a diagram showing the flow of processing performed by the charge/discharge distribution control device 2A. The communication unit 20 of the charge/discharge distribution control device 2A collects information about the state of each storage battery 3 (step S1001) and outputs the information to the control unit 22. FIG. This information includes the installation point temperature of each storage battery 3, and information on whether or not each storage battery 3 is performing charging/discharging processing. This information may also include the above-described information on z1 and z2. Also, this information may be obtained without going through the communication section 20 or may be read from the storage section 21 by the control section 22 . Also, the control unit 22 acquires x, y, etc. obtained by the time measurement unit 220 (step S1001).

The deterioration rate derivation unit 221 obtains the internal temperature of each storage battery 3 using Equation (1). Further, the deterioration rate deriving unit 221 obtains the deterioration rate of each storage battery 3 based on the internal temperature of each storage battery 3 and the characteristic formula (step S1002). The deterioration speed derivation unit 221 outputs the obtained deterioration speed of each storage battery 3 to the distribution ratio determination unit 222A.

222 A of allocation rate determination parts set a higher allocation rate with respect to the storage battery 3 with a lower deterioration rate as shown by the said example 1, 2 (step S1003), and charge/discharge amount calculation is carried out with the set allocation rate. Output to the section 223A.

Step S1003 will be described in detail below with reference to FIG. For ease of understanding, FIG. 7 illustrates a case where the charge/discharge distribution control system 1A includes three different storage batteries 3, but the number of storage batteries 3 is not limited to this. FIG. 7 shows the current internal temperature of each storage battery 3 obtained by the charge/discharge distribution control device 2A, along with the characteristic corresponding to the first characteristic expression showing the relationship between the internal temperature of each storage battery 3 and the rate of deterioration. .

The gradient of the deterioration speed with respect to the internal temperature of the storage battery 3A represented by the first characteristic formula is larger than the gradient of the deterioration speed with respect to the internal temperature of the storage battery 3B. However, the current internal temperature T _A of the storage battery 3A obtained by the charge/discharge distribution control device 2A is lower than the current internal temperature T _B of the storage battery 3B. Accordingly, the current deterioration rate V _A of the storage battery 3A obtained by the charge/discharge distribution control device 2A is smaller than the current deterioration rate V _B of the storage battery 3B. Similarly, the magnitude relationship between the deterioration rates of the storage batteries 3A, 3B, and 3C is obtained, and the charge/discharge distribution control device 2A sets the maximum distribution rate for the storage battery 3A, which has the lowest deterioration rate, and then sets the deterioration rate. The next largest value allocation ratio is set for the small storage battery 3B, and the minimum allocation ratio is set for the storage battery 3C with the highest deterioration rate.

Returning to FIG. 6, in step S1004, the communication unit 20 of the charge/discharge distribution control device 2A acquires a charge/discharge request from the host device (step S1004).

As will be described later, during operation of the storage battery 3, the flow process from step S1001 to step S1006 shown in FIG. 6 is repeated every few minutes. Therefore, until step S1003 of the current flow process, each storage battery 3 may not have been charged/discharged by the charge/discharge command value corresponding to the charge/discharge request acquired in the previous flow process. In this case, the charge/discharge distribution control device 2A needs to recalculate how much charge/discharge is required. In this case, the charge/discharge distribution control device 2A collects information related to the charge/discharge time of each storage battery 3 and the charge/discharge amount per unit time, and obtains the total charge/discharge amount of each storage battery 3 at the present time. , is subtracted from the requested charge/discharge amount acquired in step S1004 of the previous flow process to update the requested charge/discharge amount. Then, the charge/discharge distribution control device 2A adds the charge/discharge request amount acquired from the host device in step S1004 of the current flow process to the updated charge/discharge request amount as a new charge/discharge request amount. The required charge/discharge amount is updated (step S1004). This processing is performed, for example, by the charge/discharge amount calculator 223A.

In step S<b>1005 , the charge/discharge amount calculation unit 223</b>A obtains the charge/discharge allocation amount of each storage battery 3 . 223 A of charge/discharge amount calculation parts calculate the charge/discharge allocation amount of each storage battery 3 using the allocation rate to each storage battery 3 acquired by the output signal from 222 A of allocation rate determination parts. Specifically, the charge/discharge request amount is multiplied by the allocation rate of the storage battery 3 to obtain the charge/discharge allocation amount of the storage battery 3 . However, if the charge/discharge allocation amount of the storage battery 3 obtained here is larger than the maximum charge/discharge amount of the storage battery 3, the charge/discharge amount calculation unit 223A calculates the charge/discharge allocation amount to the storage battery 3 and its A difference from the maximum charge/discharge amount of the storage battery 3 is obtained. Then, the charge/discharge amount calculation unit 223A multiplies the difference by the allocation rate of each of the storage batteries 3 other than this storage battery 3 obtained in the above step S1003, and calculates the charge/discharge allocation to each of these other storage batteries 3. Add to quantity. This processing is also referred to as difference distribution processing. Note that the charge/discharge amount calculation unit 223A sets the charge/discharge allocation amount for the storage battery 3 whose charge/discharge allocation amount is larger than the maximum charge/discharge amount as the maximum charge/discharge amount of the storage battery 3 . In addition, while such a difference occurs, the charge/discharge amount calculation unit 223A continues to calculate the difference until the difference is eliminated or until the sum of the charge/discharge allocation amounts to the storage battery 3 matches the charge/discharge request amount. Repeat the distribution process.

The charge/discharge distribution amount of the storage battery 3 finally calculated in step S1005 is the amount of electricity to be charged/discharged by the storage battery 3 (also referred to as a charge/discharge command value). The charge/discharge amount calculation unit 223A outputs the calculated charge/discharge command value of each storage battery 3 to the communication unit 20 .

The communication unit 20 issues a charge/discharge command to the storage battery 3 whose charge/discharge command value is greater than 0 (step S1006). Note that the communication unit 20 may issue a charge/discharge command with the charge/discharge command value set to 0 even for the storage battery 3 that has a charge/discharge command value of 0 or that does not need to be charged/discharged. Further, when there are a plurality of storage batteries 3 to which the charge/discharge command is issued, the charge/discharge command in step S1006 may be issued each time the charge/discharge command value for one storage battery 3 is obtained in step S1005.

In addition, for example, in the case of FIG. 7, the load of the storage battery 3A may become larger than the load of the other storage batteries 3 while the charging/discharging process is performed. This is because heat continues to be generated inside the storage battery 3 by continuing to operate the storage battery 3 , thereby increasing the internal temperature of the storage battery 3 . Therefore, the flow processing from steps S1001 to S1006 shown in FIG. 6 of the charge/discharge distribution control device 2A is repeated on the order of several minutes.

(effect)
According to the charge/discharge distribution control system 1A described above, it is possible to obtain the internal temperature of the already manufactured storage battery 3 without opening the storage battery 3, and it is possible to incorporate many types of storage batteries 3 into the system. . In addition, the charge/discharge distribution control device 2A can grasp the deterioration speed of each storage battery 3 quickly and accurately by acquiring the internal temperature rise characteristics and the deterioration speed characteristics of each storage battery 3 in advance. Then, the charge/discharge distribution control device 2A assigns an appropriate charge/discharge amount to each storage battery 3 based on the deterioration rate, thereby delaying the progress of deterioration of each storage battery 3 in the charge/discharge distribution control system 1A. This makes it possible to delay the progress of deterioration of the charge/discharge distribution control system 1A as a whole.

(Second embodiment)
The charge/discharge distribution control device 2A according to the first embodiment described above sets the distribution ratio of each storage battery 3 with respect to the charge/discharge request, calculates the charge/discharge distribution amount, and uses this as the charge/discharge command value. The charge/discharge distribution amount control device 2B according to the present embodiment determines the priority of each storage battery 3 to be charged/discharged based on the deterioration speed of each storage battery 3, and issues a charge/discharge command to the storage battery 3 based on this. .

(Description of components)
The configuration of the charge/discharge distribution control system 1B according to the present embodiment is obtained by replacing the charge/discharge distribution control device 2A in the charge/discharge distribution control system 1A illustrated in FIG. 3 with the charge/discharge distribution control device 2B according to the present embodiment. correspond to things. Components other than the charge/discharge distribution control device 2B in the charge/discharge distribution control system 1B are the same as those according to the first embodiment, and therefore description thereof is omitted.

FIG. 8 is a functional block diagram of a charge/discharge distribution control device 2B according to an example of this embodiment. The charge/discharge distribution control device 2B includes a control section 22B instead of the control section 22A in the charge/discharge distribution control device 2A. The control unit 22B includes a priority order determination unit 222B in place of the distribution rate determination unit 222A in the first embodiment, and a charge/discharge amount calculation unit 223B in place of the charge/discharge amount calculation unit 223A.

Other functional blocks in the charge/discharge distribution control device 2B that perform the same processes as those in the charge/discharge distribution control device 2A are denoted by the same reference numerals, and description thereof is omitted. However, the output destination of the deterioration speed from the deterioration speed derivation unit 221 is the allocation ratio determination unit 222A in the first embodiment, but is the priority determination unit 222B in this embodiment. In the first embodiment, the charging/discharging amount calculating section 223A outputs the charging/discharging command value of each storage battery 3 to the communication section 20, but in the present embodiment, the charging/discharging amount calculating section 223B.

The priority determination unit 222B of the control unit 22B determines the priority of each storage battery 3 based on the deterioration speed of each storage battery 3 acquired from the output from the deterioration speed derivation unit 221. FIG. Here, the order of priority means an order indicating which storage battery 3 should be prioritized for charging and discharging.

The charge/discharge amount calculation unit 223B of the control unit 22B calculates a charge/discharge command value for the storage battery 3 based on the priority of each storage battery 3 acquired from the priority determination unit 222B.

The hardware configuration of a charge/discharge distribution control device 2B according to this embodiment is the same as that shown in FIG. 5 according to the first embodiment. However, the function corresponding to the function realized as the control unit 22A in the above embodiment by the processor 70 shown in FIG. It is a function. Other than this, it is the same as the case of the said 1st Embodiment.

(Action)
FIG. 9 is a diagram showing the flow of processing by the charge/discharge control device 2B according to this embodiment. As shown in FIG. 9, the charge/discharge control device 2B according to the present embodiment performs steps S1003B and S1005 instead of step S1003 by the charge/discharge distribution control device 2A according to the first embodiment described with reference to FIG. Instead, step S1005B is executed.

Each process in step S1001, step S1002, step S1004, and step S1006 is the same as in the case of the above-described first embodiment, so description thereof will be omitted. It should be noted that each of these processes is performed by a functional block having the same functional block name (with a different code in some cases) as the processing entity described in the corresponding process in the flow of the first embodiment.

The priority determining unit 222B determines the priority of each storage battery 3 based on the output from the deterioration rate deriving unit 221 (step S1003B). This decision processing will be described in detail with reference to FIG.

In FIG. 10, for ease of understanding, it is assumed that there are three storage batteries 3A, 3B, and 3C in the charge/discharge distribution control system 1B, but the number of storage batteries 3 in the system is not limited to three. In FIG. 10, the current internal temperatures of the storage batteries 3A, 3B, 3C are T _A , T _B , T _C , and correspondingly the respective deterioration rates of the current storage batteries 3A, 3B, 3C are V _A , V _B and _VC ( _VA < _VB < _VC ). Since the storage battery 3A has the lowest deterioration rate, the priority determining unit 222B sets the highest priority (priority 1) to the storage battery 3A. Then, the priority determining unit 222B sets the next highest priority (priority 2) to the storage battery 3B having the next lowest deterioration rate. The priority determining unit 223B sets the lowest priority (priority n) to the storage battery 3 having the highest deterioration rate among the n storage batteries 3 to be charged and discharged. In the case of FIG. 10, since n=3 and the deterioration rate of the storage battery 3C is the highest, the priority determining unit 223B sets priority 3 to the storage battery 3C.

The priority determination unit 222B outputs the determined priority of each storage battery 3 to the charge/discharge amount calculation unit 223B.

Returning to FIG. 9, in step S1005B, the charge/discharge amount calculation unit 223B obtains a charge/discharge command value for each storage battery 3 based on the output signal from the priority order determination unit 222B. More specifically, the charge/discharge amount calculator 223B determines whether or not the maximum charge/discharge amount of the storage battery 3 with the highest priority (priority 1) is greater than the charge/discharge request amount. When the charge/discharge request amount is equal to or less than the maximum charge/discharge amount, the charge/discharge amount calculation unit 223B assigns the charge/discharge request amount to the storage battery 3 having priority 1 as the charge/discharge command value.

On the other hand, when the requested charge/discharge amount is greater than the maximum charge/discharge amount of the storage battery 3 with priority 1, the charge/discharge amount calculation unit 223B calculates the maximum charge/discharge amount of the storage battery 3 with priority 1. Assigned as a charge/discharge command value. Then, the charge/discharge amount calculation unit 223B determines that the difference between the charge/discharge request amount and the maximum charge/discharge amount of the storage battery 3 with the priority 1 is the maximum charge of the storage battery 3 with the next highest priority (the storage battery 3 with the priority 2). It is determined whether or not it is greater than the discharge amount. Then, when this difference is equal to or less than the maximum charge/discharge amount, the charge/discharge amount calculation unit 223B assigns the charge/discharge command value corresponding to the difference to the storage battery 3 with priority 2 . On the other hand, when the difference is larger than the maximum charge/discharge amount of the storage battery 3 of priority 2, the charge/discharge amount calculation unit 223B calculates the difference between the difference and the maximum charge/discharge amount of the storage battery 3 of priority 2. Further, it is determined whether or not the calculated difference is greater than the maximum charge/discharge amount of the storage battery 3 of the next highest priority (priority 3). After that, the charge/discharge amount calculation unit 223B repeats the same processing until the difference becomes 0 or until the sum of the charge/discharge command values assigned to the storage battery 3 becomes the charge/discharge request amount (step S1005B).

(effect)
According to this embodiment, the charge/discharge distribution control device 2B determines the priority of each storage battery 3 based on the deterioration rate, and calculates the charge/discharge command value for each storage battery 3 based on this, thereby reducing the amount of calculation. Further reduction can be achieved, and progress of deterioration of the storage battery 3 in the charge/discharge distribution control system 1B can be suppressed.

(Third embodiment)
In the first and second embodiments described above, the relationship between the deterioration rate of the storage battery 3 and the temperature was described. However, the rate of deterioration of the storage battery 3 varies depending on the remaining charge (hereinafter also referred to as SOC) in addition to the temperature. In this embodiment, the SOC is also taken into consideration in deriving the deterioration rate. The SOC is generally obtained by using the accumulated charge/discharge amount of the storage battery 3 or by using the voltage. When the SOC is obtained by using the accumulated charge/discharge amount, the estimated SOC value obtained by the calculation gradually deviates from the actual value due to measurement error. Therefore, for example, once every two weeks, the storage battery 3 is changed from a fully charged state to a fully discharged state, or vice versa, from a fully discharged state to a fully charged state, and the SOC reference value (for example, 0% or 100%) ). By correcting the SOC estimated value using this reference value, an accurate SOC value can be obtained. This processing is referred to as SOC correction processing.

At least one of the SOC estimated value and the reference value may be derived by the charge/discharge distribution control device 2C or the PCS 5 according to the present embodiment. When at least one of the SOC estimated value and the reference value is derived by the PCS 5, information on the derived SOC is transmitted from the PCS 5 to the charge/discharge distribution control device 2C. Moreover, at least one of the information relating to the SOC estimated value and the reference value may be obtained from the outside by the charge/discharge distribution control device 2C. In this embodiment, it is assumed that the charge/discharge distribution control device 2C acquires the SOC reference value in advance. Then, the charge/discharge distribution control device 2C obtains the SOC from this reference value and the accumulation of charge/discharge amounts.

Note that when the SOC is obtained from the voltage, the SOC correction process described above is not performed. In many cases, the SOC can be obtained more accurately by integrating the charge/discharge amount including the correction described above than by calculating the SOC from the voltage. Therefore, in this embodiment and subsequent embodiments, the SOC is obtained by integrating the charge/discharge amount.

In this embodiment, the charge/discharge distribution control device 2C obtains the deterioration speed of each storage battery 3 from the internal temperature and SOC of each storage battery 3 . Then, the charge/discharge distribution control device 2C distributes the charge/discharge amount to each storage battery 3 according to the deterioration speed.

Here, the internal temperature and SOC of the storage battery 3 are independent of each other, and the rate of deterioration is determined by these. The charge/discharge distribution control device 2C holds a second characteristic formula that approximates the relationship between the internal temperature of the storage battery 3, the SOC, and the rate of deterioration. In this characteristic formula, the internal temperature and SOC are parameters, and the deterioration rate is derived by uniquely determining these values. This second characteristic formula is unique to each storage battery 3 and is known. In addition to such a characteristic formula, the control device 2 may hold data in tabular form or the like in which the internal temperature, SOC, and deterioration rate of each storage battery 3 are associated with each other. The second characteristic formula and the data in tabular form are included in the deterioration rate characteristic.

(Description of components)
A charge/discharge distribution control system 1C according to the present embodiment will be described with reference to FIG. 2B is replaced with a charge/discharge distribution control device 1C. Other constituent elements are the same as in the above embodiment, so description thereof will be omitted.

Functional blocks of the charge/discharge distribution control device 2C according to this embodiment are shown in FIGS. The charge/discharge distribution control device 2C includes a storage unit 21C instead of the storage unit 21 of the charge/discharge distribution control devices 2A and 2B according to the first and second embodiments. Also, the charge/discharge distribution control device 2C includes a controller 22C instead of the controllers 22A and 22B in the first and second embodiments. 22 C of control parts are provided with 221 C of deterioration rate derivation|leading-out parts instead of the deterioration rate derivation part 221 in the said embodiment. Other functional blocks are the same as those in the above embodiment, so description thereof is omitted.

The storage unit 21C stores the second characteristic formula instead of or together with the first characteristic formula. Note that the first characteristic formula may be obtained from the second characteristic formula. The storage unit 21</b>C also stores the reference value of the SOC of each storage battery 3 and the accumulated value of the charge/discharge amount of each storage battery 3 . The storage unit 21C also stores information such as Equation (1) stored by the storage unit 21 in the above embodiment.

The deterioration rate derivation unit 221C of the control unit 22C obtains the SOC of each storage battery 3 from the SOC reference value and the accumulated charge/discharge amount stored in the storage unit 21C. Also, the deterioration rate of each storage battery 3 is obtained by substituting the SOC into the second characteristic expression together with the internal temperature of each storage battery 3 .

Further, the hardware configuration of the charge/discharge distribution control device 2C according to this embodiment is illustrated in FIG. 5, as in the first and second embodiments. Here, the storage device 72 can implement the function of the storage section 21C. Further, the processor 70 uses the information in the memory 71 or reads the information from the storage device 72 into the memory 71 and performs processing, thereby realizing the functions of the control section 22C. Since other points are the same as those described in the above embodiment, the description is omitted.

(action)
Flows of processing by the charge/discharge distribution control device 2C according to the present embodiment are shown in FIGS. In this embodiment, step S1001C is replaced with step S1001, and step S1002C is replaced with step S1002.

In step S1001C, in addition to executing the processing of step S1001 in the above embodiment, the SOC reference value and the accumulated charge/discharge amount stored in the storage unit 21C by the control unit 22C (degradation rate deriving unit 221C) is read out.

In step S1002C, the deterioration rate derivation unit 221C obtains the internal temperature of each storage battery 3 using equation (1), as in the above embodiment. Further, the deterioration rate derivation unit 221C obtains the current SOC from the SOC reference value and the accumulated charge/discharge amount. The deterioration speed deriving unit 221C obtains the deterioration speed of each storage battery 3 using the obtained internal temperature and SOC of each storage battery 3 and the deterioration speed characteristic (here, the second characteristic formula) of each storage battery 3 (step S1002C). .

Here, with reference to FIG. 11, the deterioration rate derivation process in step S1002C will be described in more detail. FIG. 11 shows the relationship between the internal temperature, SOC, and deterioration rate of the storage battery 3 on a two-dimensional plane. The characteristic of each storage battery 3 in FIG. 11 represented by the above-described first characteristic formula changes in slope or the like according to changes in SOC. Also, the characteristic of each storage battery 3 has a smaller slope as the SOC decreases.

As shown in FIG. 11, the current SOCs of storage batteries 3A, 3B, and 3C are assumed to be 30%, 30%, and 50%, respectively. Also, let the current internal temperatures of the storage batteries 3A, 3B, and 3C be _TA , _TB , and _TC . At this time, as shown in FIG. 11, the current deterioration speeds of storage batteries 3A, 3B, and 3C are obtained as _VA , _VB , and _VC . I understand.

Returning to FIGS. 6 and 9, the deterioration rate of each storage battery 3 obtained by the deterioration rate derivation section 221C is output to the distribution rate determination section 222A or the priority order determination section 222B.

Since subsequent processing is the same as that of the first and second embodiments, the description is omitted. It should be noted that each of these processes is performed by a functional block having the same functional block name (with a different code in some cases) as the processing entity described in the corresponding process in the flow of the above embodiment.

(effect)
According to the charge/discharge distribution control system 1C according to the present embodiment, not only the internal temperature of each storage battery 3 but also the SOC is taken into consideration, so the deterioration speed can be obtained more accurately than in the case of the above embodiment. Accordingly, a more appropriate charge/discharge command value for delaying the progress of deterioration of each storage battery 3 is calculated. As a result, progress of deterioration of each storage battery 3 in the charge/discharge distribution control system 1C can be further delayed.

(Fourth embodiment)
In the above embodiment, the current internal temperature of the storage battery 3 or a combination of the current internal temperature of the storage battery 3 and the SOC is used to derive the deterioration rate of each storage battery 3 . In the present embodiment, the deterioration rate of each storage battery 3 after a predetermined period of time is calculated using the internal temperature of each storage battery 3 after a predetermined period of time has passed, or the combination of the internal temperature of each storage battery 3 after a predetermined period of time has passed and the SOC. It is assumed that the distribution ratio to each storage battery 3 and the priority of each storage battery 3 are determined using this. In the following description, the internal temperature and SOC of the storage battery 3 are collectively referred to as control parameters.

A more detailed description will be given below. Internal heat is generated in each storage battery 3 by charging and discharging for a certain period of time. The charge/discharge distribution control device 2D according to the present embodiment predicts the value of the control parameter of each storage battery 3 after a predetermined time from the present time, and obtains the deterioration speed based on this predicted value. As a result, it is possible to further reduce the deterioration rate error caused by a change in the value of the control parameter while the deterioration rate is being obtained using the current value of the control parameter. In this case, derivation of the current deterioration rate may not be performed.

Further, when the storage battery 3 is charged and discharged for a predetermined period of time, the deterioration rate based on the predicted value of the control parameter after the predetermined period of time may be equal to or higher than the upper limit value. The charge/discharge distribution control device 2D may set a small distribution rate for such a storage battery 3, or may set a distribution rate that decreases over time. Also, the charge/discharge distribution control device 2D may lower the priority of such a storage battery 3 when the rate of deterioration reaches the upper limit.

The predicted value of the internal temperature of the storage battery 3 may be obtained, for example, by obtaining the charge/discharge electric energy using the charge/discharge current and the internal resistance. Also, the predicted value of the internal temperature may be obtained from the equation (1). Here, when formula (1) is used, x is replaced with "elapsed time from the latest charge/discharge start point to the prediction point" instead of "elapsed time from the latest charge/discharge start point to the present time", Replace y with "elapsed time from the latest charging/discharging end point to the predicted point".

The predicted value of SOC is obtained from the charge/discharge amount to be charged/discharged by the prediction time based on the current SOC.

The predicted values of the internal temperature and SOC are obtained several minutes after the current time. The deterioration rate of each storage battery 3 is obtained by substituting the predicted value of the internal temperature into the first characteristic formula, or substituting the predicted values of the internal temperature and the SOC into the second characteristic formula, or the like. In the present embodiment described below, it is assumed that predicted values of the internal temperature and SOC are obtained, and the deterioration rate of the storage battery 3 is obtained from these.

(Description of components)
The system configuration of the charge/discharge distribution control system 1D according to the present embodiment is shown in FIG. A control device 2D is provided. Other components are the same as in the above embodiment.

The functional blocks of the charge/discharge distribution control device 2D according to the present embodiment are shown in FIGS. A controller 22D is provided in place of the controller. Further, the control section 22D includes a deterioration rate deriving section 221D in place of the deterioration rate deriving section in the above embodiment. Other functional blocks are the same as those in the above embodiment shown in FIGS. 4 and 8, so description thereof is omitted.

In addition to the information stored in the storage unit according to the above-described embodiment, the storage unit 21D stores the accumulated SOC value of each storage battery 3 per a certain period of time (for example, per cycle time of the allocation rate and priority order determination process) as a constant value or a constant value. (collectively referred to as the accumulated value of SOC per fixed time) is held.

The deterioration rate derivation unit 221D of the control unit 22D reads the cumulative value of SOC per predetermined time stored in the storage unit 21D, and obtains the predicted value of the SOC after the predetermined time has passed. Further, the deterioration rate derivation unit 221D obtains the predicted value of the internal temperature after a predetermined time has elapsed by obtaining the charge/discharge power amount as described above or by using the formula (1). The deterioration speed derivation unit 221D obtains the deterioration speed after a predetermined time from these predicted values.

The hardware configuration of a charge/discharge distribution control device 2D according to this embodiment is illustrated in FIG. 5, as in the above embodiment. Here, the storage device 72 can implement the function of the storage section 21D. Further, the processor 70 uses the information in the memory 71 or reads the information from the storage device 72 into the memory 71 and performs processing, thereby realizing the function of the control section 22D. Since other points are the same as those described in the above embodiment, the description is omitted.

(action)
A processing flow of the charge/discharge distribution control device 2D according to the present embodiment will be described with reference to FIGS. The flow by the charge/discharge distribution control device 2D includes step S1001D instead of steps S1001 and S1001C in the flow according to the above embodiment, and step S1002D instead of steps S1002 and S1002C.

The deterioration rate derivation unit 221D collects information about the state of each storage battery 3 via the communication unit 220 or from the storage unit 21D (step S1001D). The information collected here includes the accumulated value of the SOC of each storage battery 3 per certain period of time in addition to the information collected in steps S1001 and S1001C in the above embodiment.

In S1002D, the deterioration rate derivation unit 221D obtains the charge/discharge power amount using the charge/discharge current and the internal resistance, or by substituting x and y obtained by replacing the current time with the predicted time into the equation (1). , a predicted value of the internal temperature of each storage battery 3 is obtained. Further, the deterioration rate derivation unit 221D obtains a predicted value of SOC using the current SOC of each storage battery 3 and the accumulated value of SOC per certain period of time. Then, the deterioration rate derivation unit 221D obtains the deterioration rate of each storage battery 3 at the time of prediction using the predicted values of the internal temperature and SOC of each storage battery 3 (S1002D). The deterioration rate of each storage battery 3 at the time of prediction is output to the allocation rate determination section 222A or the priority order determination section 222B.

In step S1003 in FIG. 6, the distribution rate determination unit 222A sets the distribution rate of each storage battery 3 based on the deterioration speed of each storage battery 3 at the time of prediction from the deterioration speed derivation unit 221D. It should be noted that the processing in the allocation rate determination unit 222A in step S1003 is the same as that in the above-described embodiment except for the deterioration rate used.

In step S1003B in FIG. 9, the priority determination unit 222B determines the priority of each storage battery 3 based on the deterioration speed of each storage battery 3 at the time of prediction from the deterioration speed derivation unit 221D. It should be noted that the processing in the priority determining unit 222B in step S1003B is the same as that in the above embodiment, except for the deterioration rate used.

Since other processing is the same as the processing in the above embodiment, the description is omitted. It should be noted that each of these processes is performed by a functional block having the same functional block name (with a different code in some cases) as the processing entity described in the corresponding process in the flow of the above embodiment.

(effect)
According to the charge/discharge distribution control device 2D according to the present embodiment, even if there is a change in the value of the control parameter while the deterioration rate is being obtained using the current control parameter, after the change A deterioration rate of each storage battery 3 is obtained. As a result, an appropriate charge/discharge command is assigned to each storage battery 3 in accordance with the change in deterioration rate. Further, by obtaining the deterioration speed of the storage battery 3 after a predetermined time from the predicted value of the control parameter, it becomes possible to allocate charge/discharge commands accordingly.

(Fifth embodiment)
In the charge/discharge distribution control system according to the above embodiment, the charge/discharge command value for each storage battery 3 is obtained based on the deterioration rate. However, there may be a storage battery 3 with a high deterioration rate but a small degree of deterioration, or a storage battery 3 with a low deterioration rate but a high degree of deterioration. Therefore, there is a case where a large charge/discharge command value is assigned to the storage battery 3 in which the derived deterioration rate is small but the degree of deterioration has progressed. As a result, the life of the storage battery 3 may be shortened.

In the present embodiment, the degree of deterioration of each storage battery 3 is taken into consideration, and a case is considered in which the priority of the storage battery 3 having a greater degree of deterioration is shifted backward or removed from the target of charge/discharge distribution.

In this embodiment, the degree of deterioration of each storage battery 3 is measured as follows. The charge/discharge distribution control device 2E, the PCS 5, or an external device according to the present embodiment obtains the charge amount when each storage battery 3 is fully charged during the SOC correction process as described in the third embodiment. . When the PCS 5 or an external device acquires the charge amount at full charge, this value is notified to the charge/discharge distribution control device 2E.

The degree of deterioration, which is an index indicating the degree of deterioration, is defined below.
Degree of deterioration = charge amount at full charge / rated charge amount (2)

The degree of deterioration is such that the smaller the value, the larger the degree of deterioration, and the larger the value, the smaller the degree of deterioration.

The charge/discharge distribution control device 2E obtains the degree of deterioration of each storage battery 3 using equation (2). In this embodiment, it is assumed that the degree of deterioration is automatically measured by the charge/discharge distribution control device 2E.

Since the deterioration of each storage battery 3 progresses as the internal resistance increases, the degree of deterioration may be obtained from the internal resistance in addition to the above method. Further, the degree of deterioration of each storage battery 3 may be obtained as a time integral of the deterioration rate.

The charge/discharge distribution control device 2E determines the charge/discharge distribution ratio or priority of each storage battery 3 by the same processing as in the above embodiment, and weights the distribution ratio or priority with reference to the degree of deterioration. etc. to change the allocation rate or priority. Moreover, if the degree of deterioration of the storage battery 3 is equal to or lower than the lower limit value, the storage battery 3 may be excluded from the target of the charge/discharge process.

(Description of components)
A system configuration of a charge/discharge distribution control system 1E according to this embodiment is shown in FIG. 3, and includes a charge/discharge distribution control device 2E instead of the charge/discharge distribution control device in the above embodiment. Components other than the charge/discharge distribution control device are the same as those in the above-described embodiment, so description thereof will be omitted.

FIG. 12 is a diagram showing an example of functional blocks of a charge/discharge distribution control device 2E according to this embodiment. The charge/discharge distribution control device 2E includes a storage unit 21E instead of the storage unit in the above embodiment, and a control unit 22E instead of the control unit in the above embodiment.

The storage unit 21E stores the rated charge amount of each storage battery 3 in addition to the information stored in the storage unit in the above-described embodiment, and stores each storage battery 3 obtained by the charge/discharge distribution control device 2E in the SOC correction process or the like. Stores the amount of charge when the battery is fully charged. Alternatively, instead of being stored in the storage unit 21E, the charge amount at full charge may be directly acquired by the deterioration degree detection unit 224, which will be described later, in the SOC correction process or the like.

The storage unit 21E also stores the deterioration degree of each storage battery 3 calculated by the deterioration degree detection unit 224 .

The control unit 22E includes a deterioration speed derivation unit 221E instead of the deterioration speed derivation unit according to the above embodiment, and an allocation ratio/priority determination unit 222E instead of the allocation ratio determination unit or priority determination unit according to the above embodiment. , and further includes a deterioration degree detection unit 224 .

The deterioration degree detection unit 224 calculates the deterioration degree of each storage battery 3 using the formula (2) described above. Here, the deterioration degree detection unit 224 reads the rated charge amount of each storage battery 3 from the storage unit 21E. Then, the deterioration degree detection unit 224 uses the rated charge amount of each storage battery 3 and the charge amount at full charge of each storage battery 3 acquired during the SOC correction process or the like to determine each storage battery from equation (2). 3 is calculated. The deterioration degree of each storage battery 3 obtained by the deterioration degree detection unit 224 is stored in the storage unit 21E. It should be noted that these processes are performed independently of the charge/discharge process during operation of the storage battery 3 .

The deterioration rate derivation unit 221E reads the degree of deterioration of each storage battery 3 from the storage unit 21E. Then, the deterioration rate derivation unit 221E determines whether the degree of deterioration of each storage battery 3 is equal to or lower than the lower limit, and obtains the deterioration rate of the storage battery 3 whose degree of deterioration is greater than the lower limit. Further, the deterioration rate derivation unit 221E may or may not obtain the deterioration rate of the storage battery 3 whose degree of deterioration is equal to or lower than the lower limit value.

The deterioration speed derivation unit 221E outputs the obtained deterioration speed of the storage battery 3 to the distribution ratio/priority determination unit 222E.

The distribution ratio/priority determination unit 222E determines the distribution ratio or priority of each storage battery 3 based on the deterioration speed of each storage battery 3 output by the deterioration speed derivation unit 221E. Note that the allocation ratio/priority determination unit 222E does not have to determine the allocation ratio and priority of the storage battery 3 for which the deterioration speed is not obtained by the deterioration speed derivation unit 221E. The allocation ratio/priority determination unit 222E does not have to output the undetermined allocation ratio or priority to the charge/discharge amount calculation units (223A, 223B).

When acquiring the deterioration rate of the storage battery 3 whose deterioration degree is equal to or less than the lower limit value from the deterioration rate derivation unit 221E, the allocation ratio/priority determination unit 222E may read the deterioration degree of each storage battery 3 from the storage unit 21E. Then, the allocation rate/priority determination unit 222E does not have to determine the allocation rate or the priority of the storage batteries 3 whose degree of deterioration is equal to or less than the lower limit value. Alternatively, the allocation rate/priority determination unit 222E may obtain the allocation rate or priority of the storage battery 3 whose degree of deterioration is equal to or less than the lower limit value from the deterioration rate. Then, the allocation ratio/priority determining unit 222E may set the obtained allocation ratio to a smaller value as a new allocation ratio for the storage battery 3, or may set the obtained priority value to a higher value. A new priority order for the storage battery 3 may be used.

Note that the allocation rate/priority determining unit 222E determines such that the sum of the allocation rates becomes 1, or that the priority values are consecutively numbered from the smallest (so that the priorities do not have discrete values). do.

The allocation ratio/priority determination unit 222E outputs the determined allocation ratio or priority of the storage battery 3 to the charge/discharge amount calculation unit 223A or the charge/discharge amount calculation unit 223B, respectively.

Other functional blocks are the same as in the above-described embodiment, so description thereof will be omitted.

The hardware configuration of a charge/discharge distribution control device 2E according to this embodiment is illustrated in FIG. 5, as in the above embodiment. Here, the storage device 72 can implement the function of the storage unit 21E. Further, the processor 70 uses the information in the memory 71 or reads the information from the storage device 72 into the memory 71 and performs processing, thereby realizing the function of the control section 22E. Since other points are the same as those described in the above embodiment, the description is omitted.

(Action)
The processing flow of this embodiment will be described with reference to FIGS. In the flow of this embodiment, the processing of step S1001E is performed instead of the processing of steps S1001, S1001C, and S1001D in the above embodiment, the processing of step S1002E is performed instead of the processing of steps S1002, S1002C, and S1002D, and the processing of step S1003 is performed. , the process of step S1003E is performed instead of S1003B. These processes are described below.

In step S1001E, the deterioration rate deriving unit 221E acquires the degree of deterioration of each storage battery 3 from the storage unit 21E in addition to the processing of the deterioration rate deriving unit according to the above embodiment (step S1001E). The deterioration rate derivation unit 221E determines whether the degree of deterioration of each storage battery 3 is equal to or less than the lower limit. In order to reduce the amount of calculation, the deterioration rate derivation unit 221E in this embodiment excludes the storage batteries 3 whose degree of deterioration is equal to or lower than the lower limit value from deterioration rate derivation targets, and obtains the deterioration rate of the remaining storage batteries 3 (step S1002E). However, the deterioration speed deriving unit 221E may obtain the deterioration speed of the storage battery 3 whose degree of deterioration is equal to or less than the lower limit value.

The deterioration rate derivation unit 221E outputs the derived deterioration rate of each storage battery 3 to the distribution ratio/priority determination unit 222E.

In step S1003E, the allocation ratio/priority determination unit 222E determines the allocation ratio or priority of each storage battery 3 based on the deterioration speed acquired from the deterioration speed derivation unit 221E. The allocation ratio/priority determination unit 222E in this embodiment receives the output of the deterioration speed of the storage battery 3 whose degree of deterioration is greater than the lower limit value from the deterioration speed derivation unit 221E, and determines the allocation ratio or priority of these storage batteries 3. (step S1003E). However, when receiving the output of the deterioration speed of the storage battery 3 whose degree of deterioration is equal to or less than the lower limit value from the deterioration speed derivation unit 221E, the distribution ratio/priority determination unit 222E reads the deterioration degree of each storage battery 3 from the storage unit 21E, It is not necessary to determine the allocation rate or the priority order for the storage batteries 3 whose degree of deterioration is equal to or less than the lower limit value, or the allocation rate or the priority order for the storage batteries 3 whose degree of deterioration is equal to or less than the lower limit value is determined based on the deterioration speed. A lower rate may be set, or a lower priority may be set.

Distribution ratio/priority determination unit 222E outputs the determined distribution ratio to charge/discharge amount calculation unit 223A, or outputs the priority to charge/discharge amount calculation unit 223B.

The subsequent processes shown in FIGS. 6 and 9 are the same as the processes in the above embodiments, so descriptions thereof will be omitted. It should be noted that each of these processes is performed by a functional block having the same functional block name (with a different code in some cases) as the processing entity described in the corresponding process in the flow of the above embodiment.

(effect)
According to the present embodiment, by not performing charge/discharge processing on the storage battery 3 that has progressed in deterioration, the degree of deterioration can be adjusted according to, for example, the replacement time of the storage battery 3, and the life of each storage battery 3 can be adjusted. can be lengthened.

(Sixth embodiment)
In the above embodiment, the allocation ratio or priority order to each storage battery is determined based on the deterioration rate. Therefore, for example, in the second embodiment, a plurality of storage batteries 3 may have the same priority. In addition to the deterioration rate and degree of deterioration, there are items that must be considered for the storage battery 3 . In this embodiment, charging/discharging is distributed based on more detailed information of the storage battery 3 in addition to the deterioration rate and degree of deterioration.

(Description of components)
A charge/discharge distribution control system 1F according to the present embodiment is shown in FIG. 3 as described above. A charge/discharge distribution control system 1F according to the present embodiment includes a charge/discharge distribution control device 2F instead of the charge/discharge distribution control device according to the above embodiment. Other constituent elements are the same as those of the above embodiment, so description thereof will be omitted.

The functional block of the charge/discharge distribution control device 2F according to the present embodiment is shown in FIG. 4, FIG. 8, or FIG. A control unit 22F is provided in place of the control unit in the embodiment. Other functional blocks are the same as those in the above-described embodiment, so description thereof is omitted.

Here, in the present embodiment, in addition to the information stored in the above embodiment, the storage unit 21F stores information (also referred to as storage battery information) an example of which is shown in FIG.

Referring to FIG. 13, the storage unit 21F stores information such as a unique identification number, maximum charge/discharge amount, internal temperature, SOC, deterioration degree, accumulated usage time after maintenance, accumulated charge/discharge amount, etc. of each storage battery 3. store information about each item in The upper part of FIG. 13 shows the identification number of each storage battery 3, maximum charge/discharge amount, maximum and minimum SOC (maximum SOC and minimum SOC, respectively), current SOC, usage time after maintenance, and the like. is. Also shown in the lower part of FIG. 13 are the identification number of each storage battery 3, maximum charge/discharge amount, upper/lower limit of internal temperature, current internal temperature, lower limit of degree of deterioration, current degree of deterioration, accumulated amount of charge/discharge, etc. is. In addition to the items shown in FIG. 13, the storage battery information may include other items, and even if the storage battery information does not include some of these items shown in FIG. good. Combinations other than the combination of items shown in the upper and lower stages of FIG. 13 may be stored for each storage battery 3 . Further, if these items are associated with each storage battery 3, data in a format other than a table may be stored in the storage unit 21F instead of the table shown in FIG.

The control section 22F includes a deterioration rate derivation section 221F instead of the deterioration rate derivation section in the above embodiment. Further, the control unit 22F includes an allocation ratio/priority determination unit (allocation ratio determination unit or priority determination unit) 222F instead of the allocation ratio determination unit and priority determination unit allocation ratio/priority determination unit in the above embodiment. .

The control unit 22F refers to the storage battery information and, for example, when the current internal temperature of the storage battery 3 exceeds the upper limit of the internal temperature, does not subject the storage battery 3 to the charging/discharging process. First, the deterioration rate derivation unit 221F refers to the storage unit 21F and reads various information of the storage battery 3 (current internal temperature, current SOC, etc.). Then, the deterioration rate derivation unit 221F calculates the deterioration rate of the storage battery 3, for example, when the internal temperature is higher than the upper limit, the current deterioration degree is equal to or less than the lower limit value (deterioration degree lower limit), or the current SOC is greater than the maximum SOC. You don't have to ask. 13, the current internal temperature value is 30 and the internal temperature upper limit value is 25, for example. In this case, the deterioration speed derivation unit 221F does not need to obtain the deterioration speed of the storage battery 3. As a result, the control unit 22F may determine the allocation ratio and the priority order among the storage batteries 3 excluding the storage battery 3 having the identification number 2, which is not subject to the charge/discharge command.

Further, for example, the allocation ratio/priority determining unit 222F may lower the allocation ratio or priority of the storage battery 3 whose required period has passed since maintenance, or increase the allocation ratio of the storage battery 3 whose scheduled maintenance date is near. may also be prioritized. As for the usage time after maintenance in FIG. 13, the storage unit 21F stores the time at the time of maintenance, and based on this, the time measurement unit 21 calculates and stores the storage battery information while updating it from time to time. Also, instead of the usage time after maintenance, the time of the last maintenance may be stored.

The type of storage battery 3 may be stored in the storage battery information, and the allocation rate/priority determining unit 222F gives a large allocation rate or high priority to a redox flow battery with an extremely low deterioration rate and a long life, for example. , the allocation rate or the order of priority may be changed according to the type of the storage battery 3 .

Note that the processes of the deterioration rate derivation unit 221F and the allocation ratio/priority determination unit 222F are not limited to those described above.

The upper and lower limits of the internal temperature, the maximum and minimum values of SOC, the maximum charge/discharge amount, etc. in FIG. 13 are stored in the storage unit 21F prior to the following processing.

The hardware configuration of the charge/discharge distribution control device 2F according to this embodiment is the same as that of the above embodiment, and each hardware and each function block (the code is different from that in the above embodiment, but the function block name is the same ) are also the same as above, so the description is omitted.

(Action)
The charge/discharge distribution processing by the charge/discharge distribution control device 2 according to the present embodiment will be described with reference to FIGS. However, instead of steps S1001, S1001C, S1001D, and S1001E, the process of step S1001F described below is executed. Also, instead of steps S1002, S1002C, S1002D, and S1002E, the processing of step S1002F described below is executed. Also, instead of the processing of steps S1003, S1003B, and S1003E, the processing of step S1003F is executed.

In step S1001F, the deterioration rate derivation unit 221F collects the storage battery information of each storage battery 3 from the storage unit 21F in addition to the information collection performed by the deterioration rate derivation unit according to the above embodiment.

In step S1002, the deterioration rate derivation unit 221F stores the obtained control parameter values (current SOC, current internal temperature, etc.) in the storage battery information of the storage unit 21F. The deterioration rate derivation unit 221F refers to the storage battery information of each storage battery 3 and selects the storage battery 3 to which the charging/discharging process is not distributed by using the obtained control parameter value. Subsequently, the deterioration rate derivation unit 221F obtains the deterioration rate of the storage battery 3 to which the charge/discharge process is to be distributed by the method described above.

The allocation ratio/priority determination unit 222F determines the allocation ratio or priority based on the deterioration speed of each storage battery 3 obtained by the deterioration speed derivation unit 221F, refers to the storage battery information, and appropriately weights the allocation ratio. Or correct the priority.

Other processing is the same as the processing according to the above-described embodiment, so the description is omitted. It should be noted that each of these processes is performed by a functional block having the same functional block name (with a different code in some cases) as the processing entity described in the corresponding process in the flow of the above embodiment.

(effect)
According to this embodiment, appropriate priority determination and charging/discharging distribution are performed based on detailed information on each storage battery 3 .

(Seventh embodiment)
The allocation process to each storage battery 3 in the above embodiment was performed by the charge/discharge allocation control device. The charge/discharge distribution control system according to the present embodiment includes a screen and an input device for the user to refer to the state of each storage battery 3 and perform distribution processing based on this, or the user can use the charge/discharge distribution control device to It is provided with a screen for confirming whether or not appropriate charge/discharge processing is distributed.

(Description of components)
A charge/discharge distribution control system 2G according to this embodiment is represented by FIG. 3 and includes a charge/discharge distribution control device 2G instead of the charge/discharge distribution control device according to the above embodiment. Other components in the system are the same as those in the above embodiment, so the description is omitted.

The functional block of charge/discharge distribution control device 2G is shown in FIG. etc. shall be provided. Other functional blocks in the charge/discharge control device 2G are the same as those in the above-described embodiment, so description thereof will be omitted. Note that the charge/discharge distribution control device 2G includes a storage unit 21F.

Note that the display unit 23, the input unit 24, and the like may be provided in the charge/discharge distribution control system 1G separately from the charge/discharge distribution control device 2G.

The input unit 24 accepts input from the user, and accepts input of a command from the user for manually determining priorities by the user and for displaying an image, which will be described later, on the display unit 23 .

The input processing unit 25 processes commands read by the input unit 24 . For example, if the command read by the input unit 24 from the user is to display information on each storage battery 3 (also referred to as storage battery information for display), the input processing unit 25 notifies the display processing unit 26 of this. The storage battery information for display will be described later.

When the command read by the input unit 24 is to change the allocation ratio or priority order of each storage battery 3, the input processing unit 25 notifies the control unit 22G of this, and the allocation ratio based on the command. or priority order to calculate the charge/discharge command value.

The display processing unit 26 refers to information indicating the state of each storage battery 3, such as storage battery information stored in the storage unit 21F, and performs processing for displaying the information on the display unit 23. FIG.

The display unit 23 displays display storage battery information based on an instruction from the display processing unit 25 .

The control unit 22G has functional blocks similar to those of the control unit according to the above embodiment. However, in addition to the functions of the allocation rate determining unit, priority determining unit, or allocation rate/priority determining unit in the above embodiment, an instruction to change the determination of the allocation ratio or priority of each storage battery 3 is received from the input unit 24. an allocation ratio determining unit, a priority determining unit, or an allocation ratio/priority determining unit that has a function of changing the allocation ratio or the priority according to the instruction in the event of an error.

FIG. 15 shows an example of the storage battery information for display displayed by the display unit 23. As shown in FIG. The user can refer to the storage battery information for display to know, for example, the current charge/discharge amount, SOC, internal temperature, degree of deterioration, priority, upper and lower limits of SOC, upper limit of temperature, etc. of each storage battery 3 . Note that items other than the items shown in FIG. 15 may also be displayed. Also, not all of the items shown in FIG. 15 need to be displayed.

FIG. 16 shows an example of the hardware configuration of the charge/discharge distribution control device 2G. A charge/discharge distribution control device 2G according to this embodiment includes an input device 74 and a display device 75 in addition to the hardware in the above embodiments.

The input device 74 is, for example, operation buttons, a mouse, a touch panel, or the like. The function of the input unit 24 is implemented by the input device 74 .

The display device 75 is, for example, a liquid crystal panel, a cathode ray tube device, or the like. The function of the display unit 23 is realized by the display device 25 .

The functions of the control unit 22G, the input processing unit 25, and the display processing unit 26 are realized by the processor 70 reading various types of information into the memory 71 and processing the information.

(Action)
The processing of the charge/discharge distribution control device 2G according to this embodiment is shown in FIGS. However, instead of steps S1003, S1003B, S1003E, and S1003F described above, the process of step S1003G is executed.

In step S1003G, the control unit 22G sets the allocation ratio or the priority in response to an instruction to set the allocation ratio or the priority through the input unit 24. FIG.

Other processes are the same as those of the other embodiments, so the description is omitted. Note that each of these processes is performed by functional blocks having the same names (the symbols may be different) in the above embodiment.

(effect)
The user can monitor the state of the storage battery 3 and change the allocation ratio or priority of the charging/discharging process of each storage battery 3 as appropriate.

(Eighth embodiment)
The process of distributing the charge/discharge request amount to each storage battery 3 in the above embodiment was performed by one charge/discharge distribution control device.

In the charge/discharge distribution control system according to the eighth embodiment, the charge/discharge distribution control devices are hierarchized into a high-order control device and a low-order control device. By sharing the work with the control device, the speed of the allocation process is increased.

FIG. 17 is a diagram showing an example of the configuration of a charge/discharge distribution control system according to the eighth embodiment.

The charge/discharge distribution control system 1H includes a charge/discharge distribution control device 2H and a plurality of storage battery groups G (storage battery groups G1 to Gn). In addition, the number of the storage battery groups G is not specifically limited. Also, n is a natural number of 2 or more.

The charge/discharge distribution control device 2H includes a high-order control device U and the same number of low-order control devices L as the storage battery groups G (low-order control devices L1 to Ln).

The storage battery group G1 includes a plurality of storage batteries 3 (storage batteries 3-11 to 3-16), the same number of temperature measurement devices 4 (temperature measurement devices 4-11 to 4-16) as the storage batteries 3, and the same number of PCS as the storage batteries 3. (Power Conditioning System) 5 (PCS 5-11 to 5-16). Similarly, the storage battery group Gn includes a plurality of storage batteries 3 (storage batteries 3-n1 to 3-n6), the same number of temperature measurement devices 4 (temperature measurement devices 4-n1 to 4-n6) as the storage batteries 3, and storage batteries 3 and the same number of PCS5 (PCS5-n1 to 5-n6). Note that the number of storage batteries 3 in each storage battery group G is not limited to six.

The host control device U receives a charge/discharge request amount for the entire charge/discharge distribution control system 1H from a host device (not shown). Note that the host control device U may determine the charge/discharge request amount by a control logic that exists separately inside itself instead of receiving the charge/discharge request amount from the host device. More specifically, for example, the upper control device U stores information such as "how much charge/discharge amount is required at what time" in tabular form or the like, and uses this information to determine the charge/discharge amount. You may

In addition, the host controller U obtains a deterioration speed (hereinafter referred to as group deterioration speed) for each storage battery group G, and uses the obtained deterioration speed for each group to determine the priority (hereinafter referred to as a priority order) corresponding to each storage battery group G. group priority), and using the set group priority, the charge/discharge request amount received from the host device is distributed to each storage battery group G as the group charge/discharge request amount. Here, the group deterioration speed represents the deterioration speed of the entire group obtained from the deterioration characteristics of the storage battery group. Also, the group priority is an evaluation value evaluated for each storage battery group, and represents the priority when viewed in group units.

Each low-order control device L obtains a deterioration speed (hereinafter referred to as a battery deterioration speed) for each of the storage batteries 3 in the corresponding storage battery group G, and uses the obtained storage battery deterioration speed to determine the priority corresponding to each storage battery 3. The order (hereinafter referred to as battery priority order) is determined, and the group charge/discharge request amount is further distributed to each storage battery 3 as a charge/discharge command value using the determined priority order of each storage battery.

Each temperature measuring device 4 measures the ambient temperature (measurement point temperature) of the corresponding storage battery 3 . Then, the temperature measuring device 4 notifies the corresponding lower control device L of the measured temperature at the measuring point based on the information acquisition request from the corresponding lower control device L or automatically. Alternatively, the temperature measuring device 4 may store the above equation (1), obtain the internal temperature of the storage battery 3 based on the temperature at the measuring point measured by itself, and notify the corresponding lower control device L of the internal temperature.

Each PCS 5 charges or discharges the storage battery 3 based on the charge/discharge command value from the corresponding low order control device L. When charging the corresponding storage battery 3 , each PCS 5 converts AC power input from a power system to which a solar power generation device or a wind power generation device is connected into DC power, and outputs the DC power to the storage battery 3 . When discharging the corresponding storage battery 3, each PCS 5 converts the DC power output from the storage battery 3 into AC power and outputs the AC power to the power system.

A combination of the storage battery 3 and the PCS 5 (power converter) is defined as a power storage unit. Also, the charge/discharge distribution control device 2H may be connected to the power storage unit via a wired or wireless communication network such as the Internet or an intranet.

FIG. 18 is a diagram showing an example of functional blocks of the upper controller U and the lower controllers L1 to Ln.

The host controller U includes a communication unit U-1, a storage unit U-2, and a control unit U-3.

The communication unit U-1 acquires information necessary for processing by the upper controller U from the upper controller and each lower controller L. FIG. That is, the communication unit U-1 receives the charge/discharge request amount from the host device and notifies it to the control unit U-3. Further, the communication unit U-1 acquires information indicating the state of the storage battery group G from each lower control device L, and stores the information in the storage unit U-2.

The control unit U-3 includes an upper deterioration rate derivation unit U-31, an upper priority order setting unit U-32, and an upper charge/discharge request amount calculation unit U-33.

The upper deterioration rate calculation unit U-31 obtains the group deterioration rate corresponding to each storage battery group G, and stores it in the storage unit U-2.

For example, the upper deterioration rate calculator U-31 stores the group temperature obtained from the lower controller L and the Obtain the group degradation rate by substituting the group SOC. The third characteristic formula is a unique formula for each storage battery group G, and is stored in the storage unit U-2 so that it can be used according to the type of storage battery. In addition, the group SOC is calculated using the rated capacity [kWh] of the storage batteries in the group as the denominator and the amount of power [kWh] supplied to the storage batteries in the group when they are actually charged as the numerator. represents the SOC of

Alternatively, the upper deterioration rate calculation unit U-31 refers to tabular data (deterioration rate characteristics) in which the values of the group temperature, group SOC, and group deterioration rate for each storage battery group G are associated with each other, and performs lower control. A group deterioration rate corresponding to the group temperature and the group SOC obtained from the device L may be obtained. Note that the tabular data in which the values of the group temperature, the group SOC, and the group deterioration rate are associated is specific data for each storage battery group G, and is stored in the storage unit U-2. .

The upper priority order setting unit U-32 sets the group priority order corresponding to each storage battery group G and stores it in the storage unit U-2.

For example, the upper priority order setting unit U-32 lowers the group priority order in ascending order of the group deterioration rate. In other words, the higher priority setting unit U-32 sets a higher group priority to the storage battery group G having a lower group deterioration rate. As a result, since the charge/discharge capacity is preferentially allocated to the storage battery group G including many storage batteries 3 with a slow deterioration rate, the charge/discharge capacity is distributed to the storage battery group G including many storage batteries 3 with a fast deterioration rate. can be suppressed. As a result, the progress of deterioration of the storage battery as a whole can be slowed down.

The higher charge/discharge request amount calculation unit U-33 calculates the group charge/discharge request amount for each storage battery group G using the charge/discharge request amount, the group priority, and the upper and lower limits of the output power of the storage battery group G. It is calculated and stored in the storage unit U-2.

For example, the upper charge/discharge request amount calculation unit U-33 uses the group output power upper limit value as the upper limit value, and distributes the charge/discharge request amount to each storage battery group G in descending order of group priority (ascending order). A group charging/discharging demand amount corresponding to each storage battery group G is calculated.

Each of the lower control devices L1 to Ln includes a communication section L-1, a storage section L-2, and a control section L-3.

The communication unit L-1 issues a charge/discharge command to the above-described power storage unit (PCS5) according to the charge/discharge command value for each storage battery 3 calculated by the control unit L-3. If a unit having a function of issuing a charge/discharge command from the charge/discharge distribution control device 2H to the storage unit is called a charge/discharge command unit, the charge/discharge command unit in this embodiment corresponds to the communication unit L-1.

Further, when the communication unit L-1 receives an information acquisition request from the upper control device U, it notifies the control unit L-3. Upon receiving the information acquisition request, the control unit L-3 divides the integrated value of the internal temperature of the storage battery 3 sent from each PCS 5 of the corresponding storage battery group G by the total number of storage batteries 3, thereby obtaining A group temperature corresponding to G is obtained and transmitted to the host controller U via the communication unit L-1. In addition, when receiving the information acquisition request, the control unit L-3 divides the integrated value of the SOC of the storage battery 3 sent from each PCS 5 of the corresponding storage battery group G by the total number of the storage batteries 3 to obtain the storage battery A group SOC corresponding to the group G is obtained and transmitted to the upper control device U via the communication unit L-1.

Further, when receiving an information acquisition request from the host controller U, the communication unit L-1 acquires information indicating the state of the storage battery 3 from each PCS 5 of the corresponding storage battery group G, and stores the information in the storage unit L-2.

The control unit L-3 also includes a lower deterioration rate derivation unit L-31, a lower priority order setting unit L-32, and a lower charge/discharge command value calculation unit L-33.

The lower deterioration rate derivation unit L-31 obtains the storage battery deterioration rate corresponding to each storage battery 3, and stores it in the storage unit U-2.

For example, the lower deterioration rate derivation unit L-31 adds the storage battery temperature and the storage battery SOC obtained from the PCS 5 to the second characteristic expression (deterioration rate characteristic) that approximates the relationship between the storage battery temperature, the storage battery SOC, and the storage battery deterioration rate. By substituting, the storage battery deterioration rate is obtained. It is assumed that the second characteristic equation is unique to each storage battery 3 and is stored in the storage unit L-2.

Alternatively, the lower deterioration rate derivation unit L-31 refers to tabular data (degradation rate characteristics) in which the values of the storage battery temperature, the storage battery SOC, and the storage battery deterioration rate are associated with each other, and refers to the storage battery acquired from the PCS 5. A storage battery deterioration rate corresponding to the temperature and the storage battery SOC may be obtained. The tabular data in which the values of the storage battery temperature, the storage battery SOC, and the storage battery deterioration rate are associated with each other are specific data for each storage battery 3, and are stored in the storage unit L-2.

As an example of tabular data in which the values of the fourth characteristic formula, the storage battery temperature, the storage battery SOC, and the storage battery deterioration rate are associated with each other, the higher the storage battery temperature and the higher the storage battery SOC, the higher the storage battery deterioration. It is conceivable that the speed increases.

Alternatively, as another example of tabular data in which the values of the fourth characteristic formula, the storage battery temperature, the storage battery SOC, and the storage battery deterioration rate are associated with each other, the higher the storage battery temperature and the lower the storage battery SOC, the more It is conceivable that the deterioration speed of the storage battery increases.

The lower priority setting unit L-32 sets the storage battery priority corresponding to each storage battery 3, and stores it in the storage unit L-2.

For example, the lower priority setting unit L-32 increases the storage battery priority in descending order (ascending order) of the storage battery deterioration rate. In other words, the lower priority order setting unit L-32 sets a higher priority order for the storage battery 3 having a lower storage battery deterioration rate. As a result, the group charge/discharge capacity is preferentially allocated to the storage battery 3 whose deterioration rate is slow, so it is possible to suppress the group charge/discharge capacity from being distributed to the storage battery 3 whose deterioration rate is fast. As a result, the progress of deterioration of the storage battery as a whole can be further slowed down.

The lower charge/discharge command value calculation unit L-33 calculates a charge/discharge command value for each storage battery 3 using the group charge/discharge request amount, the storage battery priority, and the upper and lower limits of the output power of the storage battery 3. , is stored in the information D2 stored in the storage unit L-2.

For example, the lower charge/discharge command value calculation unit L-33 assigns the group charge/discharge request amount to each storage battery 3 in ascending order of storage battery priority with the storage battery output power upper limit value as the upper limit value. A charge/discharge command value corresponding to each storage battery 3 is calculated.

FIG. 19 is an example of the hardware configuration of the upper control device U or the lower control device L according to the eighth embodiment.

The upper controller U or lower controller L includes a processor 80 , a memory 81 , a storage device 82 and a communication device 83 .

Processor 80 includes, for example, a single-core, dual-core, or multi-core processor.

The memory 81 is, for example, ROM, RAM, or semiconductor memory.

The processor 80 reads the information stored in the storage device 82 into the memory 81 and executes the program in the memory 81, thereby realizing the functions of the control unit U-3 or the control unit L-3.

The storage device 82 is a hard disk drive, an optical disk device, or the like, and may be an external storage device or a portable storage medium. The storage device 82 implements the function of the storage unit U-2 or the storage unit L-2.

The communication device 83 is for exchanging information with the upper device, each lower control device L, or the upper control device U and the PCS 5 by wire or wirelessly, and includes an interface for communication. The communication device 83 implements the function of the communication unit U-1 or the communication unit L-1.

Note that the upper control device U or the lower control device L may be configured by a PLC.

FIG. 20 is a sequence diagram showing an example of processing performed by the upper controller U and the lower controllers L1 to Ln according to the eighth embodiment. FIG. 20 shows that after the charge/discharge request amount is sent from the host device to the host control device U, and the information acquisition request is sent from the host control device U to each low order control device L, the host control device U and the low order control device L1 to Let us denote the processing performed by Ln.

First, each of the lower control devices L1 to Ln acquires information indicating the state of the storage battery 3 from the PCS 5 (step S1001H), stores the acquired information in the storage unit L-2, and uses the acquired information. Then, the group temperature and group SOC are obtained and transmitted to the host controller U (step S1002H).

FIG. 21 is a diagram showing an example of information D1 stored in storage unit L-2.

Information indicating the state of each of the storage batteries 3-11 to 3-16 and the like are stored in the information D1 shown in FIG. That is, the information D1 shown in FIG. 21 includes “battery name”, “battery temperature [° C.]”, “battery output power [kW]”, “battery SOC [%]”, “storage battery output power upper limit [kW] ", "lower limit value of storage battery output power [kW]", "upper limit value of storage battery SOC [%]", "lower limit value of storage battery SOC [%]", "storage battery deterioration rate", "storage battery priority", and "charge/discharge command Information corresponding to each item of "value [kW]" is stored. The information indicating the state of the storage battery 3 acquired from the PCS 5 includes items of "battery name", "battery temperature [°C]", "battery output power [kW]", and "battery SOC [%]". and information corresponding to each. Information corresponding to the item “storage battery name” is information for identifying the storage battery 3 . The information corresponding to the “storage battery temperature [°C]” is information indicating the current temperature of the storage battery 3 . Further, the information corresponding to the “storage battery output power [kW]” is information indicating the current output power of the storage battery 3 . The information corresponding to “storage battery SOC [%]” is information indicating the current SOC of the storage battery 3 . The information corresponding to the “storage battery output power upper limit value [kW]” is information indicating the upper limit value of the output power of the storage battery 3 . The information corresponding to the “lower limit value of output power of storage battery [kW]” is information indicating the lower limit value of output power of storage battery 3 . The information corresponding to the “storage battery SOC upper limit value [%]” is information indicating the upper limit value of the SOC of the storage battery 3 . The information corresponding to the “storage battery SOC lower limit value [%]” is information indicating the lower limit value of the SOC of the storage battery 3 . Further, the information corresponding to the "storage battery deterioration speed" is information indicating the storage battery deterioration speed. Information corresponding to the "storage battery priority" is the above-mentioned storage battery priority. Information corresponding to the “charge/discharge command value [kW]” is the charge/discharge command value calculated for each storage battery 3 .

Next, in the sequence diagram shown in FIG. 20, when the upper controller U determines that the group temperature and group SOC have been received from all the lower controllers L (step S1003H: Yes), the group temperature and group SOC are stored in the storage unit. After stored in U-2, the group temperature and group SOC are used to obtain the group deterioration speed for each storage battery group G, and the group deterioration speed is used to obtain the group priority corresponding to each storage battery group G. is set (step S1004H).

FIG. 22 is a diagram showing an example of information D2 stored in storage unit U-2.

Information indicating the state of each of the storage battery groups G1 to G6 and the like are stored in the information D2 shown in FIG. That is, the information D2 shown in FIG. 22 includes “storage battery group name”, “group temperature [°C]”, “group output power [kW]”, “group SOC [%]”, “group output power upper limit [kW ]”, “lower limit of group output power [kW]”, “upper limit of group SOC [%]”, “lower limit of group SOC [%]”, “group deterioration speed”, “group priority”, and “group charging Information corresponding to each item of "discharge request amount [kW]" is stored. The information transmitted from the lower control device L to the upper control device U includes "storage battery group name", "group temperature [°C]", "group output power [kW]", and "group SOC [%]". information corresponding to each item of Further, the information corresponding to the item “storage battery group name” is information for identifying the storage battery group G. FIG. The information corresponding to the item "group temperature [°C]" is information indicating the average current temperature of each of the storage batteries 3 in the storage battery group G. Further, the information corresponding to the item “group output power [kW]” is information indicating the value obtained by integrating the current output power of each storage battery 3 in the storage battery group G. FIG. Information corresponding to the item “group SOC [%]” is information indicating the current SOC average value of each of the storage batteries 3 in the storage battery group G. FIG. Information corresponding to the item “group output power upper limit value [kW]” is information indicating a value obtained by integrating the upper limit value of the output power of each storage battery 3 in the storage battery group G. FIG. The information corresponding to the item "group output power lower limit value [kW]" is information indicating a value obtained by integrating the lower limit value of the output power of each storage battery 3 in the storage battery group G. FIG. Information corresponding to the item “group SOC upper limit [%]” is the upper limit of SOC corresponding to the storage battery group G. FIG. Information corresponding to the item “group SOC lower limit [%]” is the SOC lower limit value corresponding to the storage battery group G. FIG. The information corresponding to the item "group deterioration rate" is the group deterioration rate. Information corresponding to the item "group priority" is the group priority. Further, the information corresponding to the item "group charge/discharge request amount [kW]" is the group charge/discharge request amount.

Next, in the sequence diagram shown in FIG. 20, the upper control device U uses the charge/discharge request amount and each group priority to calculate the group charge/discharge request amount for each storage battery group G (step S1005H). The calculated charge/discharge request amount for each group is transmitted to the corresponding lower control device L (step S1006H).

Next, when each of the low-order control devices L1 to Ln receives the group charge/discharge request amount (step S1007H: Yes), it uses the storage battery deterioration rate to set the storage battery priority order corresponding to each storage battery 3 (step S1008H), the charge/discharge command value corresponding to each storage battery 3 is calculated using the group charge/discharge request amount and the priority of each storage battery (step S1009H), and the charge/discharge command value is transmitted to each corresponding PCS 5 ( step S1010H).

Here, as shown in FIG. 22, the group deterioration rate corresponding to the storage battery group G1 is "0.005", the group deterioration rate corresponding to the storage battery group G2 is "0.003", and the group deterioration rate corresponding to the storage battery group G3 is The speed is "0.010", the group deterioration speed corresponding to the storage battery group G4 is "0.002", the group deterioration speed corresponding to the storage battery group G5 is "0.009", and the group deterioration speed corresponding to the storage battery group G6 is Assume that it is "0.007". In such a case, the group priority corresponding to the storage battery group G4 is "1", the group priority corresponding to the storage battery group G2 is "2", the group priority corresponding to the storage battery group G1 is "3", and the group priority corresponding to the storage battery group G6 is "1". The group priority corresponding to , is "4", the group priority corresponding to the storage battery group G5 is "5", and the group priority corresponding to the storage battery group G3 is "6". Also, the discharge request amount for the entire charge/discharge distribution control system 1H is assumed to be "2900 [kW]".

First, the high-order charge/discharge request amount calculation unit U-33 selects the charge/discharge request amount “2900 [kW]” that is the same as the group output power upper limit value of the storage battery group G4 whose group priority is “1”. The requested discharge amount "1200 [kW]" is stored in the information D2 as the requested group charge/discharge amount corresponding to the storage battery group G4.

Next, the upper charge/discharge request amount calculation unit U-33 determines that the remaining charge/discharge request amount "1700 [kW]" is the same as the group output power upper limit value of the storage battery group G2 with the group priority of "2". The requested charge/discharge amount of the value "1200 [kW]" is stored in the information D2 as the requested group charge/discharge amount corresponding to the storage battery group G2.

Next, the upper charge/discharge request amount calculation unit U-33 determines that the remaining charge/discharge request amount “500 [kW]” is the group output power upper limit value “1200 [kW]” of the storage battery group G1 whose group priority is “3”. kW]”, the requested charge/discharge amount “500 [kW]” is stored in the information D2 as the requested group charge/discharge amount corresponding to the storage battery group G1.

Next, when the upper charge/discharge request amount calculation unit U-33 determines that the remaining charge/discharge request amount has become "0 [kW]", the charge/discharge request amount "0 [kW]" is set to the group priority order. are stored in the information D2 as group charge/discharge request amounts corresponding to the storage battery groups G6, G5, and G3, respectively, where the values are "4," "5," and "6."

Then, the upper control device U transmits the group charging/discharging request amount “1200 [kW]” to the lower control devices L2 and L4 corresponding to the storage battery group G whose group deterioration rate is relatively low, and sends the group charging/discharging request to the lower control device L1. A discharge request amount of "500 [kW]" is transmitted, and a group charge/discharge request amount of "0 [kW]" is transmitted to the lower control devices L3, L5, and L6 corresponding to the storage battery group G having a relatively high group deterioration rate.

Further, as shown in FIG. 21, the storage battery deterioration rate corresponding to the storage battery 3-11 is "0.009", the deterioration rate corresponding to the storage battery 3-12 is "0.010", and the storage battery corresponding to the storage battery 3-13 The deterioration rate is "0.006", the deterioration rate corresponding to the storage battery 3-14 is "0.008", the storage battery deterioration rate corresponding to the storage battery 3-15 is "0.007", and the storage battery corresponding to the storage battery 3-16 Assume that the deterioration rate is "0.004". In such a case, the storage battery priority corresponding to the storage battery 3-16 is "1", the storage battery priority corresponding to the storage battery 3-13 is "2", the storage battery priority corresponding to the storage battery 3-15 is "3", The storage battery priority corresponding to the storage battery 3-14 is "4", the storage battery priority corresponding to the storage battery 3-11 is "5", and the storage battery priority corresponding to the storage battery 3-12 is "6". It is assumed that the group charging/discharging request amount for the lower control device L1 is "500 [kW]".

First, the lower charge/discharge command value calculator L-33 selects the same value as the storage battery output power upper limit value of the storage battery 3-16 having the storage battery priority of “1” in the group charge/discharge request amount “500 [kW]”. is stored in the information D1 as a charge/discharge command value corresponding to the storage battery 3-16.

Next, the lower charge/discharge command value calculation unit L-33 calculates the storage battery output power upper limit value of the storage battery 3-13 having the storage battery priority of “2” among the remaining group charge/discharge request amounts “300 [kW]”. The group charge/discharge request amount "200 [kW]", which is the same value as , is stored in the information D1 as the charge/discharge command value corresponding to the storage battery 3-13.

Next, the lower charge/discharge command value calculation unit L-33 determines that the remaining group charge/discharge request amount “100 [kW]” is the storage battery output power upper limit value “ 200 [kW]”, the group charge/discharge request amount “100 [kW]” is stored in the information D1 as a charge/discharge command value corresponding to the storage battery 3-15.

Next, when the lower charge/discharge command value calculation unit L-33 determines that the remaining group discharge request amount has become "0 [kW]", the group charge/discharge request amount "0 [kW]" is given priority to the storage battery. They are stored in the information D1 as charge/discharge command values corresponding to the storage batteries 3-14, 3-11 and 3-12 with the ranks of "4", "5" and "6" respectively.

Then, the lower control device 1 transmits the charge/discharge command value "200 [kW]" to PCS5-13 and 5-16, transmits the charge/discharge command value "100 [kW]" to PCS3-15, and transmits the charge/discharge command value "100 [kW]" to PCS5-15. 11, 5-12, and 5-14 with a charge/discharge command value of "0 [kW]". As a result, the PCS 5-13 discharges the storage battery 3-15 having the lowest storage battery deterioration rate at 200 [kW], and the PCS 5-16 discharges the storage battery 3-16 having the second lowest storage battery deterioration rate at 200 [kW]. The PCS 5-15 discharges the storage battery 3-15, which has the third lowest storage battery deterioration rate, at 100 [kW]. Also, PCS 5-11, 5-12 and 5-14 do not discharge storage batteries 3-11, 3-12 and 3-14 whose storage battery deterioration rate is relatively high.

As described above, according to the charge/discharge distribution control system 1H according to the eighth embodiment, among the plurality of storage batteries 3, the storage battery group G or the storage battery 3 in a state of slow deterioration is preferentially charged or discharged. is possible, the life of each storage battery 3 can be extended.

Further, according to the charge/discharge distribution control system 1H according to the eighth embodiment, the load applied to the charge/discharge distribution control device is distributed to the upper control device U and the lower control device L by the process of distributing the charge/discharge request amount. Therefore, the time required for the distribution process can be shortened as compared with the case where the distribution process is performed by one charge/discharge distribution control device.

Further, in the charge/discharge distribution control system 1H according to the eighth embodiment, a plurality of storage batteries 3 are divided into a plurality of groups, a charge/discharge request amount is distributed to each group, and a charge/discharge command value is set in parallel for each group. Therefore, even if the number of storage batteries 3 is increased in order to increase the capacity of the entire storage battery, it is possible to suppress an increase in the time required to calculate the charge/discharge command value.

In addition, in the charge/discharge distribution control system 1H according to the eighth embodiment, in the above-described configuration, the charge/discharge request amount is distributed using the priority set according to the deterioration rate of the storage battery 3. As in the charge/discharge distribution control system 1A according to the embodiment, the charge/discharge request amount may be distributed using a distribution rate set according to the deterioration rate of the storage battery 3 . In this configuration, instead of the upper priority order setting unit U-32 shown in FIG. The host control device U is provided with a higher-level allocation ratio setting unit for setting the allocation ratio of the . In addition, the upper charge/discharge request amount calculation unit U-33 compares the result of multiplying the charge/discharge request amount by the group allocation rate with the upper and lower limit values of the charge/discharge amount of the storage battery group G, and calculates the group charge/discharge request amount. do. In this configuration, instead of the lower priority order setting unit L-32 shown in FIG. 18, a larger storage battery distribution rate (group charge/discharge request The subordinate control device L is provided with a subordinate allocation ratio setting unit for setting the allocation ratio of the quantity. In addition, the lower charge/discharge command unit L-33 compares the result of multiplying the group charge/discharge request amount by the storage battery distribution ratio with the upper and lower limit values of the charge/discharge amount of the storage battery 3, and calculates the charge/discharge command value. . Other configurations are the same as those shown in FIG. Even with this configuration, it is possible to extend the life of each storage battery 3 and shorten the time required for the allocation process.

Further, as another modification of the charge/discharge distribution control system 1H according to the eighth embodiment, the host controller U distributes the charge/discharge request amount using a group distribution rate set according to the deterioration rate of the storage battery 3, It may be configured such that the group charging/discharging request amount is distributed using the storage battery priority set according to the deterioration rate of the storage battery 3 in each lower control device L. In this configuration, instead of the upper priority order setting unit U-32 shown in FIG. It is provided in the control device U. In addition, the upper charge/discharge request amount calculation unit U-33 compares the result of multiplying the charge/discharge request amount by the group allocation rate with the upper and lower limit values of the charge/discharge amount of the storage battery group G, and calculates the group charge/discharge request amount. do. Other configurations are the same as those shown in FIG. Even with this configuration, it is possible to extend the life of each storage battery 3 and shorten the time required for the allocation process.

Further, as still another modification of the charge/discharge distribution control system 1H according to the eighth embodiment, the higher level controller U distributes the charge/discharge request amount using the group priority set according to the deterioration rate of the storage battery 3. Alternatively, the group charging/discharging request amount may be distributed using a storage battery distribution rate set according to the deterioration rate of the storage battery 3 in each low-order control device L. When configured in this way, instead of the lower priority order setting unit L-32 shown in FIG. Apparatus L is provided. In addition, the lower charge/discharge command unit L-33 compares the result of multiplying the group charge/discharge request amount by the storage battery distribution ratio with the upper and lower limit values of the charge/discharge amount of the storage battery 3, and calculates the charge/discharge command value. . Other configurations are the same as those shown in FIG. Even with this configuration, it is possible to extend the life of each storage battery 3 and shorten the time required for the allocation process.

The present invention is capable of various embodiments and modifications without departing from the broader spirit and scope of the invention. Moreover, the above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention. Various modifications made within the scope of the claims and within the scope of equivalents of the invention are also considered to be within the scope of the present invention.

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H distribution system 2A, 2B, 2C, 2D, 2E, 2F, 2G, 2H control device 3 storage battery 4 temperature measuring device 5 PCS
6 power storage unit 20 communication units 21, 21C, 21D, 21E, 21F storage units 22A, 22B, 22C, 22D, 22E, 22F, 22G control unit 23 display unit 24 input unit 25 input processing unit 26 display processing unit 70 processor 71 memory 72 storage device 73 communication device 74 input device 75 display device 220 time measurement units 221, 221B, 221C, 221D, 221E, 221F deterioration rate derivation units 222A, 222F allocation rate determination units 222B, 222F priority determination units 222E, 222F allocation/ Priority determination units 223A and 223B Charge/discharge amount calculation unit 224 Degradation level detection unit U Upper control device L Lower control device G Storage battery group

Claims (28)

A charge/discharge distribution control device that receives a charge/discharge request amount and transmits a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
a deterioration rate deriving unit that obtains the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery;
a distribution rate determination unit that receives an output signal from the deterioration rate derivation unit and sets a higher distribution rate for a storage battery with a lower deterioration rate;
receiving the output signal of the allocation rate determination unit, comparing each value obtained by multiplying the charge/discharge request amount by the allocation rate of each storage battery with the maximum charge/discharge amount of each storage battery, A charge/discharge amount calculation unit that calculates the charge/discharge command value of
a charge/discharge command unit that receives an output signal from the charge/discharge amount calculation unit and transmits a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
with
When the charge/discharge distribution amount of a predetermined storage battery among the storage batteries is larger than the maximum charge/discharge amount of the predetermined storage battery, the charge/discharge amount calculation unit calculates the maximum charge/discharge amount of the predetermined storage battery as the predetermined storage battery. is assigned as a charge/discharge command value for the storage battery, the difference between the charge/discharge allocation amount of the predetermined storage battery and the maximum charge/discharge amount of the predetermined storage battery is obtained, and each of the storage batteries other than the predetermined storage battery is calculated. A charge/discharge distribution control device for assigning, as a charge/discharge command value for each of the other storage batteries, a result obtained by multiplying the distribution ratio of the storage battery by the difference and adding the result to the charge/discharge distribution amount of each of the other storage batteries. The charge/discharge distribution control device further has a deterioration degree detection unit that detects the degree of deterioration of each storage battery,
2. The charge/discharge distribution control device according to claim 1, wherein the distribution rate determining unit sets a smaller distribution rate for a storage battery determined to be degraded based on the degree of deterioration. A charge/discharge distribution control device that receives a charge/discharge request amount and transmits a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
a deterioration rate deriving unit that obtains the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery;
a priority determining unit that receives an output signal from the deterioration rate deriving unit and sets a higher priority to a storage battery having a lower deterioration rate;
A charge/discharge amount calculation unit that receives an output signal from the priority determination unit and calculates a charge/discharge command value for each storage battery based on the priority, the maximum charge/discharge amount of each storage battery, and the charge/discharge request amount. and,
a charge/discharge command unit that receives an output signal from the charge/discharge amount calculation unit and transmits a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
with
The charge/discharge amount calculation unit calculates the maximum charge/discharge amount of the first priority storage battery when the requested charge/discharge amount is larger than the maximum charge/discharge amount of the first priority storage battery. and the first difference between the charge/discharge request amount and the maximum charge/discharge amount of the first priority storage battery is the maximum charge/discharge amount of the second priority storage battery that is lower than the first priority. If it is larger, the maximum charge/discharge amount of the second priority storage battery is assigned as the charge/discharge command value for the second priority storage battery, and the first difference and the maximum charge/discharge amount of the second priority storage battery are combined. is greater than the maximum charge/discharge amount of the storage battery with the third priority lower than the second priority, the maximum charge/discharge amount of the storage battery with the third priority is set to the charge/discharge of the storage battery with the third priority. A charge/discharge distribution control device that repeats assignment as a command value until the second difference becomes zero or until the sum of the charge/discharge command values becomes the charge/discharge request amount. The charge/discharge distribution control device further includes a deterioration degree detection unit that detects the degree of deterioration of each storage battery,
4. The charge/discharge distribution control device according to claim 3, wherein the priority determining unit sets a lower priority to a storage battery having a smaller degree of deterioration. The priority order determination unit
When there are a plurality of storage batteries with the same priority among the storage batteries included in the plurality of power storage units, the ambient temperature, date of manufacture, type, cycle life, and inspection date of each of the storage batteries with the same priority Determine priority using at least one of the number of days from and the number of days until the scheduled inspection date,
5. The charge/discharge distribution control device according to claim 3 or 4, characterized in that: The deterioration rate deriving unit further detects the remaining charge of each of the storage batteries, and obtains the deterioration rate of each of the storage batteries based on the remaining charge, the internal temperature, and the deterioration rate characteristic of each of the storage batteries. 6. The charge/discharge distribution control device according to any one of 1 to 5. 7. The charge/discharge distribution control device according to any one of claims 1 to 6, wherein the internal temperature of each storage battery is the internal temperature of each storage battery at the time when the charge/discharge request amount is received. . 7. The internal temperature of each storage battery according to any one of claims 1 to 6, wherein the internal temperature of each storage battery is the internal temperature of each storage battery after a lapse of a predetermined time after receiving the charge/discharge request amount. Charge/discharge distribution control device. The charge/discharge distribution control device further includes:
a display device for displaying storage battery information including at least one of temperature, remaining charge, degree of deterioration, priority, upper limit of remaining charge, lower limit of remaining charge, and upper limit of temperature of each storage battery;
The charge/discharge distribution control device according to any one of claims 1 to 8, characterized in that: a plurality of power storage units each including a storage battery interconnected to an electric power system via a power converter; A charge/discharge distribution control system comprising:
The charge/discharge distribution control device,
Obtaining the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery,
setting a higher allocation rate for a storage battery with a lower deterioration rate;
When the charge/discharge allocation amount of a predetermined storage battery among the storage batteries is larger than the maximum charge/discharge amount of the predetermined storage battery, the maximum charge/discharge amount of the predetermined storage battery is used as the charge/discharge command value of the predetermined storage battery. allocation, calculating the difference between the charge/discharge allocation amount of the predetermined storage battery and the maximum charge/discharge amount of the predetermined storage battery, and calculating the allocation rate of each storage battery other than the predetermined storage battery among the storage batteries and the difference; is added to the charge/discharge allocation amount of each of the other storage batteries, and is assigned as the charge/discharge command value of each of the other storage batteries;
transmitting a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
A charge/discharge distribution control system characterized by: a plurality of power storage units each including a storage battery interconnected to an electric power system via a power converter; A charge/discharge distribution control system comprising:
The charge/discharge distribution control device,
Obtaining the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery,
setting a higher priority to a storage battery with a lower deterioration rate;
When the requested charge/discharge amount is greater than the maximum charge/discharge amount of the first priority storage battery, assigning the maximum charge/discharge amount of the first priority storage battery as a charge/discharge command value of the first priority storage battery; When a first difference between the requested charge/discharge amount and the maximum charge/discharge amount of the first priority storage battery is larger than the maximum charge/discharge amount of the second priority storage battery lower than the first priority, the second priority The maximum charge/discharge amount of the secondary storage battery is assigned as the charge/discharge command value for the second priority storage battery, and the second difference between the first difference and the maximum charge/discharge amount of the second priority storage battery is assigned to the second priority storage battery. assigning the maximum charge/discharge amount of the storage battery with the third priority order as the charge/discharge command value of the storage battery with the third priority order when the maximum charge/discharge amount of the storage battery with the third priority order lower than the priority order is larger than the maximum charge/discharge amount of the storage battery with the third priority order; Repeat until the second difference becomes zero or until the sum of the charge/discharge command values becomes the charge/discharge request amount,
transmitting a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
A charge/discharge distribution control system characterized by: 12. The storage battery charge/discharge distribution control system according to claim 10, wherein the charge/discharge distribution control device and the plurality of power storage units are communicably connected via a network. A charge/discharge distribution control method for receiving a charge/discharge request amount and transmitting a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
Obtaining the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery,
setting a higher allocation rate for a storage battery with a lower deterioration rate,
When the charge/discharge allocation amount of a predetermined storage battery among the storage batteries is larger than the maximum charge/discharge amount of the predetermined storage battery, the maximum charge/discharge amount of the predetermined storage battery is used as the charge/discharge command value of the predetermined storage battery. allocation, calculating the difference between the charge/discharge allocation amount of the predetermined storage battery and the maximum charge/discharge amount of the predetermined storage battery, and calculating the allocation rate of each storage battery other than the predetermined storage battery among the storage batteries and the difference; is added to the charge/discharge allocation amount of each of the other storage batteries, and is assigned as the charge/discharge command value of each of the other storage batteries;
transmitting a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
A charge/discharge distribution control method executed by a charge/discharge distribution control device. A charge/discharge distribution control method for receiving a charge/discharge request amount and transmitting a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
Obtaining the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery,
setting a higher priority to a storage battery with a lower deterioration rate;
When the requested charge/discharge amount is greater than the maximum charge/discharge amount of the first priority storage battery, assigning the maximum charge/discharge amount of the first priority storage battery as a charge/discharge command value of the first priority storage battery; When a first difference between the requested charge/discharge amount and the maximum charge/discharge amount of the first priority storage battery is larger than the maximum charge/discharge amount of the second priority storage battery lower than the first priority, the second priority The maximum charge/discharge amount of the secondary storage battery is assigned as the charge/discharge command value for the second priority storage battery, and the second difference between the first difference and the maximum charge/discharge amount of the second priority storage battery is assigned to the second priority storage battery. assigning the maximum charge/discharge amount of the storage battery with the third priority order as the charge/discharge command value of the storage battery with the third priority order when the maximum charge/discharge amount of the storage battery with the third priority order lower than the priority order is larger than the maximum charge/discharge amount of the storage battery with the third priority order; Repeat until the second difference becomes zero or until the sum of the charge/discharge command values becomes the charge/discharge request amount,
transmitting a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
A charge/discharge distribution control method executed by a charge/discharge distribution control device. A charge/discharge distribution control device that receives a charge/discharge request amount and transmits a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
a deterioration rate deriving unit that obtains the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery;
a priority determining unit that receives an output signal from the deterioration rate deriving unit and sets a higher priority to a storage battery having a lower deterioration rate;
A charge/discharge amount calculation unit that receives an output signal from the priority determination unit and calculates a charge/discharge command value for each storage battery based on the priority, the maximum charge/discharge amount of each storage battery, and the charge/discharge request amount. and,
a charge/discharge command unit that receives an output signal from the charge/discharge amount calculation unit and transmits a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
with
When there are a plurality of storage batteries having the same priority among the storage batteries included in the plurality of power storage units, the priority determination unit determines the ambient temperature, the date of manufacture, and the temperature of each of the storage batteries having the same priority. Determining the priority using at least one of the type, cycle life, number of days from inspection date, number of days until scheduled inspection date,
A charge/discharge distribution control device characterized by: The charge/discharge distribution control device further includes a deterioration degree detection unit that detects the degree of deterioration of each storage battery,
16. The charge/discharge distribution control device according to claim 15, wherein the priority order determining unit sets a lower priority order for a storage battery having a smaller deterioration degree value. The deterioration rate deriving unit further detects the remaining charge of each storage battery, and obtains the deterioration rate of each storage battery based on the remaining charge, the internal temperature, and the deterioration rate characteristic of each storage battery. 17. A charge/discharge distribution control device according to Item 15 or 16. 18. The charge/discharge distribution control device according to any one of claims 15 to 17, wherein the internal temperature of each storage battery is the internal temperature of each storage battery at the time when the charge/discharge request amount is received. . 19. The internal temperature of each storage battery according to any one of claims 15 to 18, wherein the internal temperature of each storage battery is the internal temperature of each storage battery after a lapse of a predetermined time after receiving the charge/discharge request amount. Charge/discharge distribution control device. The charge/discharge distribution control device further includes:
a display device for displaying storage battery information including at least one of temperature, remaining charge, degree of deterioration, priority, upper limit of remaining charge, lower limit of remaining charge, and upper limit of temperature of each storage battery;
The charge/discharge distribution control device according to any one of claims 15 to 19, characterized in that: A charge/discharge distribution control device that receives a charge/discharge request amount and transmits a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
a deterioration rate deriving unit that obtains the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery;
a distribution rate determination unit that receives an output signal from the deterioration rate derivation unit and sets a higher distribution rate for a storage battery with a lower deterioration rate;
receiving the output signal of the allocation rate determination unit, comparing each value obtained by multiplying the charge/discharge request amount by the allocation rate of each storage battery with the maximum charge/discharge amount of each storage battery, A charge/discharge amount calculation unit that calculates the charge/discharge command value of
a charge/discharge command unit that receives an output signal from the charge/discharge amount calculation unit and transmits a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
a display device for displaying storage battery information including at least one of temperature, remaining charge, degree of deterioration, priority, upper limit of remaining charge, lower limit of remaining charge, and upper limit of temperature of each storage battery;
A charge/discharge distribution control device. The charge/discharge distribution control device further includes a deterioration degree detection unit that detects the degree of deterioration of each storage battery,
22. The charge/discharge distribution control device according to claim 21, wherein the distribution rate determination unit sets a smaller distribution rate for a storage battery determined to be degraded according to the degree of deterioration. A charge/discharge distribution control device that receives a charge/discharge request amount and transmits a charge/discharge command to a plurality of power storage units including a storage battery interconnected to a power system via a power converter,
a deterioration rate deriving unit that obtains the deterioration rate of each storage battery based on the internal temperature of each storage battery and the deterioration rate characteristic of each storage battery;
a priority determining unit that receives an output signal from the deterioration rate deriving unit and sets a higher priority to a storage battery having a lower deterioration rate;
A charge/discharge amount calculation unit that receives an output signal from the priority determination unit and calculates a charge/discharge command value for each storage battery based on the priority, the maximum charge/discharge amount of each storage battery, and the charge/discharge request amount. and,
a charge/discharge command unit that receives an output signal from the charge/discharge amount calculation unit and transmits a charge/discharge command based on the charge/discharge command value to each of the plurality of power storage units;
a display device for displaying storage battery information including at least one of temperature, remaining charge, degree of deterioration, priority, upper limit of remaining charge, lower limit of remaining charge, and upper limit of temperature of each storage battery;
A charge/discharge distribution control device. The charge/discharge distribution control device further has a deterioration degree detection unit that detects the degree of deterioration of each storage battery,
24. The charge/discharge distribution control device according to claim 23, wherein the priority order determination unit sets a lower priority order for a storage battery having a smaller degree of deterioration. The priority order determination unit
When there are a plurality of storage batteries with the same priority among the storage batteries included in the plurality of power storage units, the ambient temperature, date of manufacture, type, cycle life, and inspection date of each of the storage batteries with the same priority Determine priority using at least one of the number of days from and the number of days until the scheduled inspection date,
25. The charge/discharge distribution control device according to claim 23 or 24, characterized in that: The deterioration rate deriving unit further detects the remaining charge of each storage battery, and obtains the deterioration rate of each storage battery based on the remaining charge, the internal temperature, and the deterioration rate characteristic of each storage battery. 26. The charge/discharge distribution control device according to any one of items 21 to 25. 27. The charge/discharge distribution control device according to any one of claims 21 to 26, wherein the internal temperature of each storage battery is the internal temperature of each storage battery at the time when the charge/discharge request amount is received. . 27. The internal temperature of each storage battery according to any one of claims 21 to 26, wherein the internal temperature of each storage battery is the internal temperature of each storage battery after a lapse of a predetermined time after receiving the charge/discharge request amount. Charge/discharge distribution control device.

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