JP7185577B2 - Storage battery control system - Google Patents

Description

In the present invention, the integrated received power amount of grid power from the start of the DC period at the consumer who is the object of demand cut (DC: Demand Cut) does not exceed a predetermined target value in each DC period. The present invention relates to a storage battery control system that controls discharge of electric power stored in a storage battery system of a consumer.

In order to control the tight supply and demand of the commercial power system, the use of demand response, which reduces the power supplied from the commercial power system (hereinafter referred to as "system power") in response to requests from electric power consumers, is being studied. . In particular, in recent years, the automation of grid power reduction requests to consumers, and the utilization of ADR (Automated Demand Response), which realizes automation of grid power reduction control at consumers, has attracted attention. It can also be used to execute demand cuts to reduce the amount of power received by a house.

In the ADR, in order to achieve the target power reduction amount in the DR server that requests the control terminal of one or more consumers to reduce the power consumption, On the other hand, it is being practiced to formulate a DR plan that indicates how much power is to be reduced in which time period (for example, see Patent Documents 1 to 3 below). On the other hand, equipment that is subject to demand response at the consumer can be broadly classified into power consumption equipment, power storage equipment, and power supply equipment. Air conditioning equipment, lighting equipment, computer equipment, etc. are assumed as power consumption equipment. As the power storage device, a storage battery or the like is assumed, and as the power supply device, a photovoltaic power generation device, a gas engine type or fuel cell type cogeneration system (heat and power combined supply system), or the like is assumed. For example, Patent Literature 4 below discloses an embodiment in which discharged power from a storage battery is used in response to a request for demand response.

JP 2013-9565 A JP 2016-103974 A JP 2017-70131 A JP 2018-68076 A

However, in the case of using a storage battery system as a target device of demand response, for example, in Patent Document 4, the discharge power amount required for the demand response request is calculated throughout the DR period to control the discharge of the storage battery. However, since the remaining storage capacity of the storage battery is limited, in order to effectively utilize this during demand cut, the discharge control of the storage battery should be finely divided into shorter time units that subdivide the DC period. There is a need to do.

SUMMARY OF THE INVENTION An object of the present invention is to provide a storage battery control system that effectively utilizes the remaining storage capacity of a storage battery and is capable of responding to demand cuts.

In order to achieve the above object, the storage battery control system according to the present invention provides that, in each DC period, the integrated received amount of grid power from the start of each DC period at a customer who is a target of demand cut is the above A storage battery control system that controls the discharge of power stored in the storage battery system of the consumer so as not to exceed a predetermined target value in each DC period,
Whether or not to discharge the storage battery system is determined for each of the accumulated received power amounts in each of the elapsed times from the start point of each DC period for each first unit time obtained by evenly subdividing the length of the DC period. a data storage unit storing a first reference received power amount serving as a reference for determination and a second reference received power amount serving as a reference for determining whether or not to permit charging of the storage battery system;
a data communication unit that transmits and receives data to and from the storage battery system;
based on the received power amount data indicating the integrated received power amount from the start time to the elapsed time received at a predetermined reception timing via the data communication unit, the integrated received power amount for each of the first unit time; determining the magnitude relationship between at least one of the first reference received power amount and the second reference received power amount; Discharge command data is transmitted to the storage battery system via the communication unit, and charging is performed to the storage battery system via the data communication unit when it is determined that the accumulated received power amount is less than the second reference received power amount. a storage battery control unit that transmits authorization data;
In each DC period, the first reference received power amount and the second reference received power amount decrease halfway from the lower limit value to the upper limit value as the elapsed time increases for each first unit time. The second reference received power amount is set to increase monotonically without increasing, and the second reference received power amount is equal to the first A first feature is that the power reception amount is set to be less than one reference power reception amount and to be equal to or less than the first reference power reception amount at each of the start point and the end point of the DC period.

According to the storage battery control system having the first feature, at each elapsed time of each first unit time of each DC period, when the integrated received power amount increases beyond the first reference received power amount set at each elapsed time, Since the increase in the grid power supplied to the power load of the consumer is covered by the discharged power from the storage battery system until the next elapsed time, the accumulated received power amount exceeds the first reference received power amount and significantly Since the increase is suppressed and the control is finely executed for each first unit time, as a result, the integrated received power amount is less than or equal to the first reference received power amount from the start point to the end point of each DC period. Along with the transition, it increases without significantly deviating from the first reference received power amount, and is controlled so as not to exceed a predetermined target value in each DC period. As a result, when viewed through one DC period, the amount of electric power discharged from the storage battery system increases in small increments according to the transition of the accumulated amount of received electric power from the start point. It is possible to effectively utilize the remaining power storage capacity of the storage battery.

Furthermore, according to the storage battery control system having the first feature, the second reference received power amount is set to be less than the first reference received power amount at each elapsed time, and when the integrated received power amount is less than the second reference received power amount Since the storage battery system can be charged only at , it is possible to prevent the storage battery system from being charged and the accumulated power reception amount from increasing unnecessarily.

Further, in the storage battery control system of the first feature, the accumulated power reception linearly increases from 0% to 100% of the target value with respect to the increase in the elapsed time from the start point to the end point of the DC period. is defined as a target integrated received power amount, the difference obtained by subtracting the first reference received power amount from the target integrated received power amount is monotonically increases, becomes a maximum positive value at the end of the first initial period, and monotonically decreases from the end of the first initial period until the first reference received power amount reaches the upper limit. A second feature is that it is set.

Furthermore, according to the storage battery control system having the second feature, the first reference received power amount is set to be smaller than the target integrated received power amount from the first half to the middle of the DC period. A line segment (trajectory) connecting the reference received power amounts is convex downward compared to the linear trajectory of the target integrated received power amount. As a result, the increase in the cumulative amount of power received was suppressed from the first half to the middle of the DC period, and more leeway to the target value was secured, so the cumulative amount of power received increased rapidly from the middle to the latter half of the DC period. Even in this case, it is possible to easily avoid the possibility that the accumulated received power amount exceeds the target value due to the discharged power from the storage battery system.

Furthermore, in the storage battery control system having the second feature, the length of the first initial period is set to 10% or more and 30% or less of the length of the DC period, and at the end of the first initial period, It is preferable that a difference obtained by subtracting the first reference received power amount from the target integrated received power amount is set to 10% or less of the target value.

Furthermore, in the storage battery control system having the second feature, it is preferable that the second reference received power amount is set to 0% of the target value in the first initial period. Alternatively, in the storage battery control system having the first or second feature, the second reference received power amount is 0% of the target value in a second initial period until a predetermined time elapses from the start point of each DC period. is preferably set to As a result, during the first or second initial period, the accumulated received power amount is always greater than or equal to the second reference received power amount, and charging permission data is not transmitted, thereby preventing charging of the storage battery system. If the charging of the storage battery system were started within the second initial period at the beginning of each DC period, the accumulated power reception amount would unnecessarily increase in the initial stage, and would rapidly increase from the middle to the latter half of the DC period. Although there is a possibility that the target value may be exceeded in some cases, this possibility is obviated by the preferred embodiment described above.

Furthermore, when the first initial period and the second initial period have the same length, the difference between the first reference received power amount after the first initial period and the second reference received power amount after the second initial period is appropriately maintained. , it becomes easy to set the first reference received power amount at each elapsed time and the second reference received power amount after the second initial period.

Further, in the storage battery control system having the first or second feature, the data communication unit receives storage battery data including the remaining storage capacity of the storage battery system together with the received power amount data at the predetermined reception timing, Even when the storage battery control unit determines that the integrated received power amount is greater than or equal to the first reference received power amount, if the remaining power storage capacity is less than or less than a predetermined lower limit set value, It is preferable not to transmit the discharge command data. This makes it possible to avoid unnecessary discharge commands to the storage battery system when the remaining power storage capacity of the storage battery system is extremely low.

Further, in the storage battery control system having the first or second feature, the data communication unit receives storage battery data including the remaining storage capacity of the storage battery system together with the received power amount data at the predetermined reception timing, Even when it is determined that the accumulated received power amount is less than the second reference received power amount, the storage battery control unit determines that the charge permission data preferably not sent. As a result, for example, when the remaining power storage capacity of the storage battery system is close to the fully charged state, an unnecessary charge command to the storage battery system can be avoided.

Further, in the storage battery control system having the first or second feature, the storage battery control unit controls the cumulative received power amount, the first reference received power amount, and the second reference received power amount for each of the first unit time. It is preferable to transmit the standby command data when neither the discharge command data nor the charge permission data is transmitted after determining the magnitude relationship with at least one of them.

Further, in the storage battery control system having the first or second characteristic, the first reference received power amount maintains the upper limit value in a first termination preparation period within a predetermined time period immediately before the end of the DC period. is preferred. Further, the length of the first termination preparation period is set to be equal to or longer than the first unit time and equal to or smaller than the larger value of 10% of the length of the DC period and three times the first unit time. is preferred. As a result, immediately before the end of the DC period, the storage battery system can be prevented from being discharged unnecessarily even though the possibility that the accumulated received power amount exceeds the target value is extremely low.

Further, in the storage battery control system having the first or second feature, the lower limit value of the first reference received power amount is set to 0% or more and 5% or less of the target value, and the It is preferable that the upper limit is set to 95% or more and 99% or less of the target value.

Furthermore, in order to achieve the above object, a program according to the present invention causes a computer to function as the storage battery control unit of the storage battery control system having the first or second feature. The storage battery control unit of the storage battery control system having the first or second feature can be caused to function on a computer by the program having the above feature.

Furthermore, in order to achieve the above object, a computer-readable recording medium according to the present invention records a program for causing a computer to function as the storage battery control unit of the storage battery control system according to the first or second feature. It is characterized by By using the computer-readable recording medium having the above characteristics, the storage battery control unit of the storage battery control system having the first or second characteristics can be operated on a computer using a program recorded on the recording medium.

According to the storage battery control system according to the present invention, in each DC period, the remaining power storage capacity of the storage battery is effectively used, and the integrated power received from the grid power is effectively controlled so as not to exceed the target value.

The block diagram which shows typically one structural example of a storage battery control system. FIG. 4 is a diagram schematically showing an example of the relationship between a first reference received power amount, a second reference received power amount, and an elapsed time from the start of a DC period; FIG. 4 is a diagram schematically showing a relationship between a difference obtained by subtracting a first reference received power amount from a target integrated received power amount and an elapsed time from the start of a DC period; FIG. 5 is a diagram schematically showing another example of the relationship between the first reference received power amount, the second reference received power amount, and the elapsed time from the start of the DC period; 4 is a flowchart showing an outline of an example of a processing procedure performed by a storage battery control unit;

An embodiment of a storage battery control system (hereinafter, abbreviated as "this system" as appropriate) according to the present invention will be described below with reference to the drawings.

[Configuration example of this system]
In each of one or a plurality of DC periods, this system 1 is the power supply from the start of each DC period in the customer targeted for demand cut (electric power supplied from the commercial power system to the customer). It controls charging and discharging of electric power stored in the storage battery system of the customer so that the accumulated amount of received electric power does not exceed a predetermined target value in each DC period. More specifically, the system 1 receives power reception information (system power) and storage battery information from the storage battery system 2 of the consumer, and transmits various command data described later to the storage battery system 2. It controls charging and discharging of the storage battery system 2 . Here, in the contract for demand cut, the integrated power reception amount PA of the grid power from the start of each DC period does not exceed the target value PT that is preset uniformly or separately for each DC period (PA ≤ PT ). The target value PT (Wh) is given by PT=PK×TD/60, where TD (minutes) is the length of the DC period and PK (W) is the target contract power. Since the length TD of the DC period is set to 30 minutes as standard, it is set to 30 minutes in this embodiment as well.

As shown in FIG. 1, the system 1 comprises a data storage unit 11, a data communication unit 12, and a storage battery control unit 13. Application software (computer program) for executing each process in the data storage unit 11, the data communication unit 12, and the storage battery control unit 13 is installed in.

The data storage unit 11 is, for example, a recording device capable of nonvolatilely recording large-capacity data such as an HDD (hard disk drive) and an SSD (solid state disk) built into or externally attached to the computer constituting the system 1. , so that data can be written, read, searched, etc. by external control. The data storage unit 11 records data necessary for arithmetic processing performed by the storage battery control unit 12 . Specifically, the data storage unit 11 records a first reference received power amount and a second reference received power amount, which will be described later, for each elapsed time for each first unit time from the start of each DC period.

The first unit time is a unit time obtained by equally subdividing the length TD of the DC period. In the present embodiment, it is assumed that TD=30 (minutes) and that it is divided into 30 equal parts, and the first unit time is 1 minute. Therefore, when the number of times that each DC period has elapsed from the start of each first unit time is the ordinal number i, the i-th elapsed time T(i) is T(i)=i (minutes). However, i=1 to 30. The start point of the DC period is the end point of the previous DC period (i=30), which is treated as the 0th elapsed time (i=0) for convenience.

Note that the first unit time is not limited to one minute, and may be a value obtained by equally dividing the length TD of the DC period by 10 to 60, for example. However, if the first unit time is long, there is a high possibility that the accumulated power reception amount PA will increase rapidly during the passage of one first unit time. is preferred. It should be noted that if the first unit time is too short (for example, several seconds or less), a hunting phenomenon may occur in the control of the integrated power reception amount PA, which is not preferable.

The first reference received power amount is a reference value for determining whether or not to discharge the storage battery system 2 with respect to the accumulated received power amount PA(i) at each elapsed time T(i). , PR1(i). Furthermore, the second reference received power amount is a reference value for determining whether or not to permit charging of the storage battery system 2 with respect to the accumulated received power amount PA(i) at each elapsed time T(i), and is described below. are appropriately denoted as PR2(i).

The data communication unit 12 performs data transmission/reception based on a predetermined communication protocol in data transmission/reception between the I/O port of the computer that constitutes the system 1 and the I/O port provided in the storage battery system 2. configured with a device. In this embodiment, a wired LAN is assumed as the data communication path 3 connecting between the system 1 and the storage battery system 2, and the serial communication protocol Modbus/TCP is assumed to be used as the communication protocol. The data communication line is not limited to wired LAN, and the communication protocol is not limited to Modbus/TCP.

The storage battery control unit 13 executes each process described later (whether or not discharge is necessary) by executing the application software on an arithmetic processing unit (for example, a CPU (Central Processing Unit), etc.) of a computer that constitutes the present system 1. determination processing, chargeability determination processing, control command processing, etc.). The application software is stored in the data storage unit 11 as an example.

The storage battery system 2 includes, for example, a storage battery 21 such as a lithium ion battery that charges and discharges, and a controller 22 such as a power conditioner. The storage battery system 2 is configured such that the controller 22 can execute charge/discharge control for the storage battery 21 in accordance with a control command from the system 1 . In addition, in this embodiment, the storage battery system 2 includes a communication device 23 similar to the data communication unit 12, and is configured to be able to transmit and receive data to and from the data communication unit 12 based on a predetermined communication protocol. Furthermore, in this embodiment, the controller 22 of the storage battery system 2 communicates with the power meter 4 that measures the power value (W) of the system power supplied to the consumer, and the power value measured by the power meter 4 is Consumer data D0 including received power amount data D1 and storage battery data D2, which will be described later, is directed to this system 1, and a first unit time (in this embodiment, one minute as an example) is further transmitted via the communication device 23. It is configured to be capable of repeated transmission every second unit time (in this embodiment, one second as an example) obtained by evenly dividing.

[Setting of first reference received power amount and second reference received power amount]
Next, how the first reference received power amount PR1(i) and the second reference received power amount PR2(i) stored in the data storage unit 11 are set for each elapsed time T(i) will be described with reference to FIGS. 2 to 4. FIG.

2 and 4 are graphs schematically showing the relationship between the first reference received power amount PR1(i), the second reference received power amount PR2(i), and the elapsed time T(i). FIG. 3 is a graph schematically showing the relationship between the difference ΔP1(i) obtained by subtracting the first reference received power amount PR1(i) from the target accumulated received power amount PAT(i), which will be described later, and the elapsed time T(i). .

2 and 4, the first reference received power amount PR1(i) is indicated by a thick dashed line, and the second reference received power amount PR2(i) is indicated by a thick solid line. ) are indicated by thin dashed lines. The target accumulated power reception amount PAT(i) is 0% to 100% of the target value PT with respect to the increase from the start point (i=0) to the end point (i=30) of the DC period of the elapsed time T(i). It is defined as the cumulative amount of power received that linearly and monotonously increases up to 10%. The target accumulated received power amount PAT(i) represents a model example of the accumulated received power amount PA(i) when ideally increases as the elapsed time T(i) increases, and is the first reference received power amount PR1(i). It is used as a comparison target when describing the characteristics of

The first reference received power amount PR1(i) monotonically increases from the lower limit value PR1L to the upper limit value PR1U without decreasing halfway as the elapsed time T(i) increases every first unit time ( monotonic increase in the broad sense). That is, PR1(i2)≧PR1(i1) is established for two elapsed times i1 and i2 (i2>i1). As an example, the lower limit PR1L is preferably 0% or more and 5% or less of the target value PT, more preferably 1% or more and 3% or less, and is set to 2% in the present embodiment. As an example, the upper limit value PR1U is preferably 95% or more and 99% or less of the target value PT, more preferably 97% or more and 99% or less, and is set to 98% in this embodiment.

Further, as shown in FIG. 3, the difference ΔP1(i) (=PAT(i)−PR1(i)) obtained by subtracting the first reference received power amount PR1(i) from the target accumulated power amount PAT(i) is During the first initial period from the start of the DC period (i = 0) to the elapse of a predetermined time, it monotonically increases, reaches the maximum positive value at the end of the first initial period, and reaches the maximum positive value at the end of the first initial period. , the first reference received power amount PR1(i) is set to monotonically decrease until it reaches the upper limit value PR1U. The monotonous increase in the difference ΔP1(i) during the first initial period and the monotonous decrease after the first initial period are not necessarily linear (the amount of change is constant for each first unit time).

As an example, the length TS1 of the first initial period is preferably 10% or more and 30% or less, more preferably 15% or more and 25% or less, of the DC period length TD. 1/6 (about 16.7%). Further, the difference ΔP1(i) obtained by subtracting the first reference received power amount PR1(i) from the target accumulated received power amount PAT(i) at the end of the first initial period is preferably 10% or less of the target value PT, such as 4%. 9% or less is more preferable, and in the present embodiment, it is set to 1/15 (about 6.7%) of the target value PT.

As shown in FIGS. 2 to 4, the first reference received power amount PR1(i) is set to be smaller than the target integrated received power amount PAT(i) from the first half to the middle of the DC period. A line segment connecting the first reference received power amount PR1(i) in T(i) is a polygonal line that is convex downward compared to one straight line (one-dot chain line) of the target accumulated received power amount PAT(i). Become.

By setting the first reference power reception amount PR1(i) so as to form a polygonal line convex downward from the first half to the middle of the DC period, as described above, the discharge necessity determination process (described later) (Fig. 5 step #11), it becomes easier to determine that PA(i)>PR1(i) with respect to an increase in the accumulated power reception amount PA(i), and in step #15 (control command processing), the storage battery system 2 On the other hand, the control command data DC (corresponding to discharge command data) for instructing discharge can be easily transmitted. As a result, an increase in the cumulative power reception amount PA(i) is suppressed from the first half to the middle of the DC period, and a larger margin is secured until the target value is reached. Even in the case of a sudden increase in the second half, the discharge power from the storage battery system 2 can easily avoid the possibility that the accumulated received power amount PA(i) exceeds the target value PT.

In the present embodiment, as shown in FIG. 2, the first reference received power amount PR1(i) reaches the upper limit value PR1U a predetermined time before the end of the DC period (i=30). The upper limit value PR1U is set to be maintained within the first termination preparation period up to the termination point (i=30) of . The length TE1 of the first termination preparation period is equal to or longer than the first unit time, 10% of the length TD of the DC period, or three times the first unit time, whichever is larger, when the first termination preparation period is provided. A value or less is preferable, and in the present embodiment, it is set to the first unit time (1 minute, 1/30 (approximately 3.3%) of the DC period length TD).

As described above, in setting the first reference received power amount PR1(i), by providing the first end preparation period and setting the upper limit value PR1U to be less than the target value PT to provide a margin, immediately before the end of the DC period, the integrated received power amount When the quantity PA(i) is about to asymptotically approach and exceed the target value PT, it is likely that PA(i)>PR1(i) is determined in the discharge necessity determination process (step #11 in FIG. 5), which will be described later. Thus, in step #15 (control command processing), control command data DC (corresponding to discharge command data) for instructing discharge to the storage battery system 2 is more likely to be transmitted. As a result, immediately before the end of the DC period, the integrated power reception amount PA(i) can be suppressed to the target value PT or less.

As shown in FIG. 4, it is not always necessary to set the first end preparation period. ), monotonically increasing without exceeding the target accumulated power reception amount PAT(i), and reaching the upper limit value PR1U at the end of the DC period (i=30).

As shown in FIGS. 2 and 4, the second reference received power amount PR2(i) increases from the lower limit value PR2L to the upper limit value PR2U as the elapsed time T(i) increases every first unit time. It is set so that it monotonically increases (broadly defined monotone increase) without decreasing at That is, PR2(i2)≧PR2(i1) is established for two elapsed times i1 and i2 (i2>i1). Furthermore, the second reference received power amount PR2(i) is the elapse of each first unit time except for the DC period start point (i=0) and end point (i=30) (that is, i=1 to 29). At each time T(i), the first reference power reception amount PR1(i) is less than the first reference power reception amount PR1(i), and at each of the DC period start point (i=0) and end point (i=30). It is set so as to be equal to or less than the reference power reception amount PR1(i).

Therefore, the lower limit value PR2L of the second reference received power amount PR2(i) is equal to or lower than the lower limit value PR1L of the first reference received power amount PR1(i), and is set to 0% of the target value PT in the present embodiment. . Further, the upper limit value PR2U of the second reference received power amount PR2(i) is equal to or lower than the upper limit value PR1U of the first reference received power amount PR1(i). It is set to the same value as the value PR1U.

Further, in the present embodiment, the second reference received power amount PR2(i) is set to the target value PT, which is the lower limit value PR2L, during the second initial period from the start point of the DC period (i=0) until a predetermined time has elapsed. It is set to 0%. As an example, the length TS2 of the second initial period is preferably 10% or more and 30% or less of the length TD of the DC period, and more preferably 15% or more and 25% or less. It is set to be the same as TS1, that is, one-sixth (approximately 16.7%) of the DC period length TD.

The difference ΔPR(i) (=PR1(i )-PR2(i)) is preferably 3% or more of the target value PT, and when the second initial period is set, it becomes maximum at the end of the second initial period, and monotonically after the second initial period It is preferably set to decrease.

In the second initial period immediately after the start of the DC period, PA(i)≦PR1(i) in the discharge necessity determination process (step #11 in FIG. 5), which will be described later, with respect to the accumulated power reception amount PA(i). If it is determined, it is reliably determined that PA(i)≧PR2(i) in the chargeability determination process (step #13 in FIG. 5) described later, so in step #15 (control command process), the storage battery system 2 can be reliably prevented from being transmitted with control command data DC (corresponding to charge command data) for permitting charging. As a result, in the second initial period immediately after the start of the DC period, an unnecessary increase in the accumulated received power amount PA(i) due to the charging of the storage battery system 2 and the accompanying unnecessary discharge of the storage battery system 2 are prevented. can be prevented.

By the way, the target value PT, which is the reference for setting the first reference received power amount PR1(i) and the second reference received power amount PR2(i), is based on the target contract power PK, as described above, at the start of each DC period. It is calculated in advance and stored in the data storage unit 11 . Calculation of the target value PT and storage in the data storage unit 11 may be performed automatically by the storage battery control unit 13 based on the target contract power PK input from the outside, or may be performed manually by the operator. good. In addition, as an example, the target contract power PK is received from an external DR server (for example, DRAS (Demand Response Automation Server)) based on a standard such as OpenADR via a data communication network such as the Internet. is also a preferred embodiment. In this case, the system 1 includes, for example, a communication device for transmitting/receiving data to/from an external DR server via a predetermined data communication network such as the Internet.

[Processing content of storage battery control unit]
Next, consumer data reception processing, integrated power reception amount calculation processing, discharge necessity determination processing, chargeability determination processing, and control command processing performed by the storage battery control unit 13 will be described with reference to FIG. 5 .

FIG. 5 shows the i-th elapsed time T ( 2 is a flowchart schematically showing the rough processing contents until the processing in i) is completed (i=1 to 30). Therefore, in the present embodiment, the process at the start point (i=0) of each DC period is executed as the process at the end point (i=30) of the previous DC period, and the process for each DC period is , is executed at an elapsed time T(i) (i=1 to 30) from the start time (i=0).

First, in step #20, the storage battery system 2 performs a process (step #201) of transmitting consumer data D0 consisting of the received power amount data D1 and the storage battery data D2 to the system 1 at an elapsed time T(i-1 ) immediately after the above-described second unit time (in this embodiment, as an example, 1 second) (in this embodiment, the repetition is performed within one first unit time (1 minute) 60 times). The dashed-dotted arrow in step #20 schematically indicates the repeat loop. The received power amount data D1 includes the power value (W) of the grid power for each second unit time, and the storage battery data D2 includes the current control mode (charge, discharge, standby) of the storage battery system 2, the maximum charge/discharge power (W ), remaining storage capacity (Wh), communication abnormality warning data indicating communication abnormality, and storage battery abnormality warning data indicating abnormality of the storage battery 21 .

In step #10 (consumer data reception process, integrated power reception amount calculation process), the system 1 receives consumer data D0, which is repeatedly transmitted from the storage battery system 2 every second unit time, at every second unit time. Each data included in the received customer data D0 is repeatedly received, for example, is temporarily overwritten and saved in a predetermined storage area (such as a register) provided in the computer that constitutes the system 1 (step #101). Subsequently, each time the consumer data D0 is received, it is determined whether or not the communication abnormality warning data included in the storage battery data D2 indicates an abnormality (step #102). determination) determines whether or not the storage battery abnormality warning data included in the storage battery data D2 indicates an abnormality (step #103). The power value of the grid power included in is multiplied by the length of the second unit time (1 second) to calculate the amount of power P2 received within the second unit time, and the processing of the previous (1 second) is added to the cumulative received power amount PA2 calculated in step #104 to update the cumulative received power amount PA2 (step #104). The integrated power reception amount PA2 that is updated every second unit time is temporarily stored in the aforementioned predetermined storage area (register or the like), for example. It should be noted that when the discharge necessity determination process (step #11) and the charge possibility determination process (step #13), which will be described later at the end of each DC period (i=30), are completed, the integrated received power amount PA2 is reset to 0. be. Therefore, the integrated received power amount PA2 represents the integrated received power amount for each second unit time from the start point (i=0) of each DC period.

When the communication abnormality warning data or the storage battery abnormality warning data indicates abnormality in the two abnormality determinations in steps #102 and #103 (YES determination in steps #102 and #103), the storage battery control unit 13 performs step # 10 (Consumer Data Receiving Process, Cumulative Received Power Calculation DC Period) A series of processes from step #101 to step #104 are repeated every second unit time (in this embodiment, the repetition is one first 60 times within a unit time (1 minute).The dashed-dotted arrow in step #10 schematically indicates the repetition loop.The final repetition process within one first unit time is Upon completion, the accumulated received power amount PA2 temporarily stored in step #104 is set as the accumulated received power amount PA(i) calculated within the first unit time of the i-th number of times that has elapsed, and is distinguished from the accumulated received power amount PA2. The data is stored in the storage area (register, etc.) or the data storage unit 11 (step #105).

By the way, the integrated received power amount PA2 calculated in step #104 is calculated using a discrete value obtained by sampling the power value of the grid power every second unit time, so the value includes a so-called quantization error. It has become. Therefore, as described above, the first reference received power amount PR1(i) is set to be smaller than the target integrated received power amount PAT(i) from the first half to the middle of the DC period, so that the quantization error can reduce the impact of In addition, the length of the second unit time is not limited to one second in the above example, and is the limit in which data transmission/reception, determination, and calculation processing in steps #10 and #20 can be repeatedly executed, and , can be changed within an allowable range of the influence of the quantization error. However, in order to reduce the influence of the quantization error, it is preferable to set the length of the second unit time as short as possible.

Next, in step #11 (discharge necessity determination process), the storage battery control unit 13 reads out the first reference received power amount PR1(i) stored in the data storage unit 11, and calculates the integrated received power amount calculated in step #10. Compare with the quantity PA(i). Here, if PA(i)>PR1(i) (YES branch), in step #12 (first remaining storage capacity confirmation process), the remaining amount included in the storage battery data D2 temporarily stored in step #10 is determined. It is determined whether the power storage capacity PB(i) is equal to or greater than the lower limit set value PBL of the power storage capacity of the storage battery 21 (PB(i)≧PBL). If PB(i)≧PBL (YES branch), step #15. The process proceeds to step #15a (discharge command processing) in (control command processing). If PA(i)≤PR1(i) in the determination of step #11 (NO branch), the process proceeds to step #13 (charging availability determination processing). If PB(i)<PBL in the determination of step #12 (NO branch), the process proceeds to step #15b (standby command processing) in step #15 (control command processing). In this embodiment, the lower limit set value PBL of the power storage capacity is set to 0% of the rated value of the power storage capacity (rated lower limit value) as an example. This is because, if the remaining power storage capacity PB(i) of the storage battery 21 is even small, it is discharged and used to suppress an increase in the accumulated power reception amount PA(i). Therefore, in this embodiment, it is basically rare that PB(i)<PBL is determined in the determination of step #12. Therefore, the operation of the system 1 is based on the premise that the remaining storage capacity of the storage battery 21 is secured to some extent.

Next, when the process proceeds from step #11 (NO branch) to step #13, the storage battery control unit 13 reads out the second reference received power amount PR2(i) stored in the data storage unit 11, and in step #10 It is compared with the calculated integrated power reception amount PA(i). Here, if PA(i)<PR2(i) (NO branch), in step #14 (second remaining storage capacity confirmation process), the remaining amount included in the storage battery data D2 temporarily stored in step #10 is determined. It is determined whether or not the power storage capacity PB(i) is equal to or less than the upper limit set value PBU of the power storage capacity of the storage battery 21 (PB(i)≤PBU). If PB(i)≤PBU (YES branch), step #15. The process proceeds to step #15c (charging command processing) in (control command processing). If PA(i)≧PR2(i) in the determination of step #13 (YES branch), or if PB(i)>PBU in the determination of step #14 (NO branch), step #15 (control command processing ) in step #15b (standby command processing). In the present embodiment, the upper limit set value PBU of the power storage capacity is set to 100% of the rated value of the power storage capacity (rated upper limit value) as an example.

In this embodiment, the lower limit set value PBL and the upper limit set value PBU of the storage capacity are stored in the data storage unit 11 in advance.

Next, when the process proceeds to step #15 (control command processing), any one of step #15a (discharge command processing), step #15b (standby command processing), and step #15c (charging command processing). , the control command data DC relating to the charging and discharging of the storage battery system 2 is created and transmitted to the storage battery system 2 via the data communication unit 12 .

In step #15a (discharge command processing), the control mode "discharge" and the control command data DC (discharge) including the maximum charge/discharge power of the storage battery data D2 temporarily stored in step #104 as the discharge power command value MD1 (corresponding to command data) is created and transmitted to the storage battery system 2 via the data communication unit 12 . The "discharge" control mode is to instruct the storage battery system 2 to discharge at the discharge power specified by the discharge power command value MD1.

In step #15c (charging command processing), control command data DC (charging command data) including the control mode "charging" and the maximum charging/discharging power of the storage battery data D2 temporarily stored in step #104 as the charging power command value MD2 (corresponding to permission data) is created and transmitted to the storage battery system 2 via the data communication unit 12 . The control mode "charge" is content that permits charging of the storage battery system 2 with the charging power specified by the charging power instruction value MD2.

In step # 15 b (standby command processing), control command data DC (corresponding to standby command data) including the control mode “standby” is created and transmitted to the storage battery system 2 via the data communication unit 12 . The power command value of the charge/discharge power command value MD included in the control command data DC is zero. "Standby" in the control mode instructs the storage battery system 2 to wait while neither charging nor discharging.

Next, at step #15, when the storage battery control unit 13 creates the control command data DC in the manner described above and transmits it to the storage battery system 2 via the data communication unit 12, the storage battery system 2 at step #21: Upon receiving the control command data DC, the built-in storage battery is controlled to discharge, charge, or stand by based on the content of the control command data DC. This control is continued until the next control command data DC is received from the storage battery control unit 13 . The control on the side of the storage battery system 2 is well-known control performed in existing storage battery systems, and is not the gist of the present invention, so a detailed description thereof will be omitted.

In the above description, it is assumed that the maximum charge/discharge power is repeatedly received every second unit time in step #10 (consumer data reception process, integrated power reception amount calculation process) as part of the storage battery data D2. However, it may be stored in the data storage unit 11 in advance, like the lower limit set value PBL and the upper limit set value PBU of the storage capacity, without being included in the storage battery data D2.

[Another embodiment]
Next, another embodiment of the above embodiment will be described.

<1> In the above-described embodiment, in step #20, the storage battery system 2 transmits the power value (W) of the grid power for each second unit time measured by the power meter 4 to the system 1 as the received power amount data D1. Then, in step #10, the storage battery control unit 13 of the present system 1 calculates the integrated received power amount PA(i) based on the power value of the grid power for each second unit time.

However, instead of the power meter 4 that measures the power value (W) of the system power, a power meter that measures the integrated power amount from a predetermined integration reference time may be used. In this case, the storage battery system 2 does not necessarily need to transmit the received power amount data D1 of the integrated power amount measured by the power meter to the system 1 every second unit time. It may be transmitted at the start point of the process that is repeated every unit time (at the point of arrival of the i-th elapsed time T(i)). The information may be received directly from the electric energy meter without passing through.

When the present system 1 receives the integrated power amount as the received power amount data D1 from the storage battery system 2 or the power meter, instead of steps #104 and #105 described above, the storage battery control unit 13 of the present system 1 , DC period at each elapsed time T(i) by simply subtracting the integrated power amount received at the end of the previous DC period (i=30) from the integrated power amount received at elapsed time T(i) It is possible to easily calculate the integrated power reception amount PA(i) from the start time (i=0).

<2> In the above embodiment, as a preferred embodiment of setting the first reference received power amount PR1(i), as shown in FIGS. The difference ΔP1(i) (=PAT(i)-PR1(i)) obtained by subtracting PR1(i) is the first initial period until a predetermined time elapses from the start point (i=0) of each DC period, monotonic , reaches the maximum positive value at the end of the first initial period, and monotonously decreases from the end of the first initial period until the first reference received power amount PR1(i) reaches the upper limit PR1U. However, the setting of the first reference power reception amount PR1(i) is not limited to the examples shown in FIGS.

For example, the difference ΔP1(i) does not become a large negative value throughout each DC period (for example, the absolute value of the negative value is about 1 to 2% or less of the target value), and the elapsed time T(i) increases. The increase and decrease may be repeated accordingly.

<3> In the above embodiment, the second reference received power amount PR2(i) is set to 0% of the target value PT in the second initial period from the start of the DC period (i=0) until the predetermined time elapses. Therefore, charging of the storage battery system 2 is not permitted.

However, in the second initial period, the second reference received power amount PR2(i) does not necessarily need to be set to 0% of the target value PT. When (i) is set high, similarly, the second reference power reception amount PR2(i) at the end of the second initial period is also set slightly higher than the target value PT of 0%. The second reference power reception amount PR2(i) may be set to monotonically increase from the start point to the end point of the two initial periods. Even with such a setting, it is expected that the integrated received power amount PA(i) will increase to some extent within the second initial period. The same effect as the case of setting to 0% can be expected to some extent.

<4> In the above embodiment, in the control command process (step #15) performed by the storage battery control unit 13 illustrated in FIG. (Step #15b) It is assumed that any one command process is performed, but if the discharge command process (Step #15a) and the charge command process (Step #15c) are not performed, the standby command process (Step The control instruction data DC may not be transmitted to the storage battery system 2 without performing #15b). In this case, as an example, when the storage battery system 2 receives the control command data DC, the process based on the discharge or charge command included in the control command data DC is performed for the first unit time (1 minute), After that, if the control command data DC is not received, the battery should wait without discharging or charging.

<5> In the above embodiment, the processing procedure and details of each process performed by the storage battery control unit 13 illustrated in FIG. 5 are an example, and are not limited to the processing procedures and details shown in FIG. For example, in the flowchart of FIG. 5, step #11 (discharging necessity determination processing) is performed before step #13 (charging possibility determination processing), but step #13 may be performed before step #11. . Also, step #11 and step #13 are performed first, and based on the result, either step #12 (first remaining power capacity confirmation process) or step #14 (second remaining power capacity confirmation process) is executed. You may make it

Furthermore, in step #10 (consumer data reception process, integrated power reception amount calculation process), the order of the two abnormality determinations in steps #102 and #103 may be exchanged. Furthermore, without performing the two abnormality determinations, in place of the communication abnormality warning data or the storage battery abnormality warning data, the system 1 receives warning data from the storage battery system 2 requesting the system 1 to stop the control, and the alarm data Step #10 (customer data reception process, integrated power reception amount calculation process) and subsequent processes may be stopped based on the above.

Furthermore, in the above-described embodiment, if PA(i)=PR1(i) in step #11 (discharging necessity determination process), the branch is NO, and the process proceeds to step #13 (charging possibility determination process). , a YES branch may be made to proceed to step #12 (first remaining power storage capacity confirmation process).

Furthermore, in the above embodiment, when PB(i)=PBL in step #12 (first remaining storage capacity confirmation process), the branch is YES and the process proceeds to step #15a (discharge command process), but NO As a branch, the process may proceed to step #15b (standby command process).

Furthermore, in the above-described embodiment, when PA(i)=PR2(i) in step #13 (charging availability determination process), the branch is YES and the process proceeds to step #15b (standby command process), but NO As a branch, the process may proceed to step #14 (second remaining power capacity confirmation process).

Furthermore, in the above-described embodiment, when PB(i)=PBU in step #14 (second remaining power storage capacity confirmation process), the branch is YES, and the process proceeds to step #15c (charging command process), but NO. As a branch, the process may proceed to step #15b (standby command process).

Furthermore, in the present system 1, step #12 (first remaining power capacity confirmation process) and step #14 (second remaining power capacity confirmation process) are not performed, and similar processes are controlled as discharge command data or charge permission data. Alternatively, the storage battery system 2 may receive the command data DC. That is, when the remaining power storage capacity PB(i) is less than or equal to the lower limit set value PBL, the storage battery system 2 does not discharge regardless of the discharge command data, and the remaining power storage capacity PB(i) is equal to or greater than the upper limit set value PBU. Alternatively, in the case of excess, charging may not be performed regardless of the charging permission data.

<6> In the above embodiment, in step #15a (discharge command processing), control command data DC (corresponding to discharge command data) including the maximum charge/discharge power as the discharge power command value MD1 is created, and step #15c (charge command processing), it is assumed that the control command data DC (equivalent to charging permission data) including the maximum charging/discharging power as the charging power command value MD2 is created. The power instruction value MD2 may not necessarily be included. However, in this case, when the storage battery system 2 side receives the control command data DC for discharging or charging, the power instruction value for discharging or charging is set to the maximum charging/discharging power by itself, and the discharging or charging process is executed. be configured to be possible.

<7> In the above embodiment, the system 1 of the present invention and the storage battery system 2 are assumed to be configured as separate systems. Also, part or all of the controller 22 and the communication device 23 excluding the storage battery 21 of the storage battery system 2 may be configured as part of the system 1 of the present invention. As an example, the storage battery control unit 13 of the system 1 of the present invention and the controller 22 of the storage battery system 2 may be configured on the same computer, in which case the data communication path 3 is configured as a data bus within the computer. may be

The present invention is a storage battery system of a consumer so that the integrated received amount of grid power from the start of each DC period at the consumer who is the object of execution of demand response does not exceed a predetermined target value in each DC period. It can be used for the purpose of controlling the discharge of the electric power stored in the battery.

Reference Signs List 1: storage battery control system 11: data storage unit 12: data communication unit 13: storage battery control unit 2: storage battery system 21: storage battery 22: controller 23: communication device 3: data communication path 4: electric power meter

Claims (13)

In order that the cumulative received amount of grid power from the start of each demand cut period (hereinafter referred to as DC period) at the customer targeted for demand cut does not exceed a predetermined target value in each DC period, A storage battery control system for controlling discharge of power stored in a storage battery system of a consumer,
Whether or not to discharge the storage battery system is determined for each of the accumulated received power amounts in each of the elapsed times from the start point of each DC period for each first unit time obtained by evenly subdividing the length of the DC period. a data storage unit storing a first reference received power amount serving as a reference for determination and a second reference received power amount serving as a reference for determining whether or not to permit charging of the storage battery system;
a data communication unit that transmits and receives data to and from the storage battery system;
based on the received power amount data indicating the integrated received power amount from the start time to the elapsed time received at a predetermined reception timing via the data communication unit, the integrated received power amount for each of the first unit time; determining the magnitude relationship between at least one of the first reference received power amount and the second reference received power amount; Discharge command data is transmitted to the storage battery system via the communication unit, and charging is performed to the storage battery system via the data communication unit when it is determined that the accumulated received power amount is less than the second reference received power amount. a storage battery control unit that transmits authorization data;
Within each DC period, the first reference received power amount and the second reference received power amount monotonically increase from lower limit to upper limit as the elapsed time increases for each first unit time. and the second reference received power amount is less than the first reference received power amount in each of the elapsed times of the first unit time except for the start time and the end time of the DC period. and is set to be equal to or less than the first reference received power amount at each of the start time and the end time of the DC period. When the cumulative received power amount that linearly increases from 0% to 100% of the target value with respect to the increase in the elapsed time from the start point to the end point of the DC period is defined as the target cumulative received power amount, the target A difference obtained by subtracting the first reference received power amount from the integrated received power amount monotonically increases during a first initial period from the start of each DC period until a predetermined time elapses, and is positive at the end of the first initial period. 2, and is set to monotonically decrease from the end of the first initial period until the first reference received power amount reaches the upper limit value. The battery control system described. The length of the first initial period is set to 10% or more and 30% or less of the length of the DC period,
3. The method according to claim 2, wherein at the end of the first initial period, a difference obtained by subtracting the first reference received power amount from the target integrated received power amount is set to 10% or less of the target value. battery control system. 4. The storage battery control system according to claim 2, wherein the second reference received power amount is set to 0% of the target value in the first initial period. The method according to any one of claims 1 to 3, wherein the second reference power reception amount is set to 0% of the target value in a second initial period from the start of each DC period until a predetermined time elapses. The storage battery control system according to any one of the items. The data communication unit receives storage battery data including a remaining storage capacity of the storage battery system together with the received power amount data at the predetermined reception timing,
Even when the storage battery control unit determines that the integrated received power amount is greater than or equal to the first reference received power amount, if the remaining power storage capacity is less than or less than a predetermined lower limit set value, The storage battery control system according to any one of claims 1 to 5, wherein the discharge command data is not transmitted. The data communication unit receives storage battery data including a remaining storage capacity of the storage battery system together with the received power amount data at the predetermined reception timing,
Even when it is determined that the accumulated received power amount is less than the second reference received power amount, the storage battery control unit determines that the charge permission data The storage battery control system according to any one of claims 1 to 6, characterized in that it does not transmit. The storage battery control unit determines the magnitude relationship between the integrated received power amount and at least one of the first reference received power amount and the second reference received power amount for each of the first unit time, and then determines the discharge command. The storage battery control system according to any one of claims 1 to 7, wherein standby command data is transmitted when neither the data nor the charging permission data is transmitted. 9. The first reference power reception amount is maintained at the upper limit value during a first end preparation period within a predetermined time immediately before the end of the DC period. storage battery control system. The length of the first end preparation period is set to be equal to or greater than the first unit time and equal to or less than 10% of the length of the DC period or three times the first unit time, whichever is greater. 10. The storage battery control system according to claim 9. The lower limit value of the first reference received power amount is set to 0% or more and 5% or less of the target value, and the upper limit value of the first reference power reception amount is set to 95% or more to 99% or less of the target value. The storage battery control system according to any one of claims 1 to 10, characterized in that: A program for causing a computer to function as the storage battery control unit of the storage battery control system according to any one of claims 1 to 11. A computer-readable recording medium recording a program for causing a computer to function as the storage battery control unit of the storage battery control system according to any one of claims 1 to 11.

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