JP7177740B2 - Storage battery control system - Google Patents

Description

In the present invention, the integrated amount of received power of grid power from the start of each DC period in a consumer who is a target of demand cut (DC: Demand Cut) does not exceed a predetermined target value in each DC period. , relates to a storage battery control system for controlling 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 that records a first reference received power amount that serves as a reference for determination;
a data communication unit that transmits and receives data to and from the storage battery system;
comprising a storage battery control unit and an update processing unit,
In each DC period, the first reference received power amount monotonically increases from a lower limit value to an upper limit value without decreasing midway as the elapsed time increases for each first unit time. , is set as an initial setting value before the start time of each DC period,
The data communication unit receives, at a predetermined reception timing, received power amount data indicating the accumulated amount of received power from the start time point to the elapsed time period, and storage battery data including the remaining power storage capacity of the storage battery system;
The storage battery control unit determines a magnitude relationship between the integrated received power amount and the first reference received power amount for each of the first unit time based on the received power amount data, and determines whether the integrated received power amount is the first reference. When it is determined that the amount of received power is greater than or exceeds the amount of power received, transmitting discharge command data to the storage battery system via the data communication unit,
The update processing unit updates, for each first unit time within a predetermined update processing period within each DC period, between the integrated received power amount and the first reference received power amount after the next time for each first unit time. A received power amount determination value that is set such that the remaining power storage capacity is greater than or exceeds a predetermined full charge determination value and the integrated received power amount is set to be less than the first reference received power amount for use in determining the magnitude relationship. When an update condition including at least being less than or equal to or less than is satisfied, the value of at least a part of the latest first reference received power amount from the current time point to the upper limit value is reduced, and the first reference The power reception amount is reset so as to monotonically increase from the current point to the upper limit value as the elapsed time increases for each of the first unit times without decreasing, and the data storage is performed. and perform a first update process of updating the already recorded first reference received power amount, and if the update condition is not satisfied, do not perform the first update process,
The update processing period is a period from a predetermined time equal to or longer than the first unit time from the start of each DC period to a predetermined time equal to or longer than the first unit time to the end of the DC period. Let it be the first feature.

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, when the remaining power storage capacity is close to a fully charged state and the accumulated power reception amount is less than or equal to the power reception amount judgment value at the beginning of the DC period, the state continues. In this case, the first reference received power amount within the update processing period is set to be stepwise lower than the initial set value, and if the integrated received power amount increases over time, the first reference received power amount is reduced. It becomes easy to exceed the threshold, and the increase in the accumulated amount of received power is easily covered by the discharged power from the storage battery system. Therefore, if the increase in the accumulated received power amount is not significant in the early stage of the DC period, the increase in the accumulated received power amount can be easily covered by the discharge power from the storage battery system. It is possible to prepare in advance for a sudden increase in the accumulated amount of received power, and as a result, effectively utilize the remaining storage capacity of the storage battery system and control the accumulated amount of received power so that it does not exceed a predetermined target value within each DC period. be done.

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 the first initial period from the start point of each DC period to the start point of the update processing period. , increases monotonically, 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 the initial setting value of the first reference power reception amount is set as described above.

Furthermore, according to the storage battery control system having the second feature, the initial setting value of 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 first reference received power amount over time 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.

Further, in the storage battery control system having the second feature, in each DC period, the initial set value of the first reference received power amount is set to the first reference received power amount from the end of the first initial period. is set to monotonically and linearly increase by a first unit increment as the elapsed time increases every first unit time until the upper limit value is reached;
The update processing unit, in the first update process,
The first reference received power amount is monotonically and linearly reduced to the first unit increment or less as the elapsed time increases for each first unit time from the current point to an intermediate point after a predetermined delay time. increasing by a second unit increment, monotonically and linearly as the elapsed time increases every first unit time from the intermediate point until the first reference received power amount reaches the upper limit, Reset to increase by a third unit increment larger than the first unit increment;
When the first update process is the second or subsequent first update process, and the previous intermediate time point set in the previous first update process exists after the current time point, the previous intermediate time point is newly set. It is preferred to replace said intermediate time points.

According to the preferred aspect described above, the first update process in the storage battery control system having the first characteristic is specifically realized.

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.

Further, in the storage battery control system having the first or second feature, the update condition includes whether the first update process has not yet been performed within the update process period, or the update process has already been performed within the update process period. When the first update process has been performed one or more times, it is preferable that a predetermined period of time has elapsed since the most recent first update process was performed. That is, even if the update condition is satisfied, the first update process may not always need to be repeated every first unit time, and may be performed at regular time intervals.

Further, in the storage battery control system having the first or second feature described above, even when the storage battery control unit determines that the integrated received power amount is equal to or greater than the first reference received power amount, the remaining stored power Preferably, the discharge command data is not transmitted when the capacity is less than or equal to a predetermined lower limit set value. 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 small.

Further, in the storage battery control system having the first or second feature, in a first end preparation period within a predetermined time immediately before the end of the DC period after the end of the update processing period, the first It is preferable that the initial set value and the set value after the first update processing of the reference power reception amount maintain the upper limit value. Further, the length of the first end preparation period is set to be equal to or longer than the first unit time and equal to or smaller than 10% of the length of the DC period or three times the first unit time, whichever is larger. 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 is set to 0% or more and 5% or less of the target value, and the upper limit is set to 95% or more and 99% or less of the target value. is preferably set to

Further, in the storage battery control system having the first or second feature, the received power amount judgment value is 30% or more and 60% of the initial setting value of the first reference received power amount at each elapsed time of the update processing period. It is preferable to set the following.

Further, in the storage battery control system having the first or second feature, the data storage unit stores the integrated received power amount at each of the elapsed times from the start of each DC period for each of the first unit times. and records a second reference received power amount that serves as a reference for determining whether or not to permit charging of the storage battery system,
In each DC period, the second reference received power amount monotonically increases from the lower limit value to the upper limit value without decreasing midway as the elapsed time increases for each first unit time. and, except for the start time and end time of the DC period, in each of the elapsed times of the first unit time, the received power amount is less than the first reference amount, and An initial set value is set before the start time of each DC period so that the received power amount is equal to or less than the first reference power amount at each end time,
The storage battery control unit
determining a magnitude relationship between the integrated received power amount and the second reference received power amount for each of the first unit time based on data indicating the integrated received power amount from the start time to the elapsed time;
transmitting charging permission data to the storage battery system via the data communication unit when it is determined that the integrated received power amount is less than the second reference received power amount;
The update processing unit
If the update condition is satisfied every first unit time within the update process period, in addition to the first update process, the integrated power reception amount and the first 2. In order to determine the magnitude relationship with the reference received power amount, at least a part of the value of the latest second reference received power amount from the current point up to the upper limit value is decreased, and the second reference received power amount is reduced. is reset so that it monotonically increases from the current time point to the upper limit value as the elapsed time increases every time the first unit time, without decreasing, and stored in the data storage unit A second update process is performed to update the already recorded second reference received power amount, and if the update condition is not satisfied, the first update process and the second update process are not performed. 3.

According to the storage battery control system having the third feature, the second reference received power amount is set to be less than the first reference received power amount at each elapsed time, and only when the accumulated received power amount is less than the second reference received power amount Since the storage battery system can be charged, even if the accumulated received power amount is less than the first reference received power amount, if the accumulated received power amount is equal to or greater than the second reference received power amount, that is, the accumulated received power amount is slightly below the first reference received power amount. In this case, it is possible to prevent the storage battery system from being charged and the accumulated power reception amount from increasing unnecessarily.

Furthermore, according to the storage battery control system having the third feature, when the residual storage capacity is close to a fully charged state and the accumulated received power amount is less than or equal to the received power amount judgment value at the beginning of the DC period, the state continues. In this case, the second reference received power amount within the update processing period is set to be stepwise lower than the initial set value. This makes it easier for the storage battery control unit to transmit charging permission data to the storage battery system unnecessarily, thereby suppressing an unnecessary increase in the accumulated received power amount accompanying charging of the storage battery system. As a result, it is possible to prepare in advance for a case where the accumulated power reception amount suddenly increases from the middle to the latter half of the DC period. It is controlled so as not to exceed a predetermined target value within the period.

Further, in the storage battery control system having the third feature, in the first initial period from the start time of each DC period to the start time of the update processing period, the initial set value of the second reference received power amount is set to the is set to 0% of the target value, and the update processing unit sets the second reference power reception amount to 0% of the target value in the second update process every first unit time within the update process period. It is preferable to delay the end of the period set in % from the current time to a predetermined time later.

According to the preferred aspect described above, the accumulated received power amount always becomes equal to or greater than the second reference received power amount within the first initial period, and the charging permission data is not transmitted, so charging of the storage battery system is prevented. If charging of the storage battery system were started within the first initial period at the beginning of each DC period, the accumulated power reception amount would unnecessarily increase in the initial stage, and would increase sharply 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, the second update process in the storage battery control system of the third feature is specifically implemented in the above preferred mode.

Further, in the storage battery control system having the third feature, even when the storage battery control unit determines that the accumulated received power amount is less than the second reference received power amount, the remaining power storage capacity is set to a predetermined upper limit set value. If it is above or above, it is preferable not to transmit the charging permission data. 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 third feature, the storage battery control unit determines the magnitude relationship between the integrated received power amount and the second reference received power amount for each of the first unit time, and then allows the charging. It is preferable to transmit the standby command data except when the discharge command data is transmitted when no data is transmitted.

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 and the update processing unit of the storage battery control system having any one of the first to third characteristics. Characterized by With the program having the above characteristics, the storage battery control unit and the update processing unit of the storage battery control system having any one of the first to third characteristics can be made to function on a computer.

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

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; 4 is a flowchart showing an outline of an example of a processing procedure performed by an update processing unit; FIG. 7 is a diagram schematically showing changes in the set value of the first reference received power amount due to the first update process; FIG. 10 is a diagram schematically showing a change in the set value of the second reference received power amount due to the second update process;

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 and storage battery information of grid power from the storage battery system 2 of the consumer, and transmits various command data described later to the storage battery system 2, so that the storage battery system 2 charge/discharge is controlled. 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, but TD is not limited to a specific length.

As shown in FIG. 1, the system 1 includes a data storage unit 11, a data communication unit 12, a storage battery control unit 13, and an update processing unit 14. As one embodiment, a general-purpose computer (for example, Application software (computer program) for executing each process in the data storage unit 11, the data communication unit 12, the storage battery control unit 13, and the update processing unit 14 is installed on a personal computer, etc.).

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). Denote 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 first reference received power amount and the second reference received power amount are set in advance as initial setting values before the DC period starts, and are recorded in the data storage unit 11 . Furthermore, in the present embodiment, when a predetermined update condition is satisfied even in the middle of the DC period, the first reference received power amount and the second The second reference received power amount is successively updated and overwritten on the first reference received power amount and the second reference received power amount already recorded in the data storage unit 11 .

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 update processing unit 14 executes the above application software on an arithmetic processing unit (for example, a CPU (Central Processing Unit), etc.) of a computer that constitutes the present system 1, thereby performing an update condition determination process, which will be described later. It is configured to execute a first update process and a second update process. 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 respective initial set values of the first reference received power amount PR1(i) and the second reference received power amount PR2(i) stored in the data storage unit 11 correspond to each elapsed time T(i). is set to , 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). Furthermore, in the present embodiment, the second reference received power amount PR2(i) is set to 0% of the target value PT, which is the lower limit value PR2L, during the first initial period.

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.

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

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 (customer data reception process, integrated power reception amount calculation process) is stopped. As a result, subsequent processing is also aborted. In step #10, the series of processes from step #101 to step #104 are repeated every second unit time (in the present embodiment, the repetition is 60 times within one first unit time (1 minute). times). The dashed-dotted arrow in step #10 schematically indicates the repeat loop. When the final repeated processing within one first unit time is completed, the accumulated received power amount PA2 temporarily stored in step #104 is replaced with the accumulated received power amount calculated within the i-th elapsed first unit time. PA(i) is stored in the above-described storage area (register or the like) or in the data storage unit 11 (step #105), distinguishing it from the accumulated power reception amount PA2.

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.

[Processing content of the update processing part]
Next, update condition determination processing, first update processing, and second update processing performed by the update processing unit 14 will be described with reference to FIGS. 6 to 8. FIG.

The first reference received power amount used by the storage battery control unit 13 in the discharge necessity determination process and the second reference received power amount used in the chargeability determination process are set to the initial setting values in the manner described above before the start of each DC period. However, in the first update process and the second update process, respectively, the first reference received power amount and the second reference received power amount are changed from the current time to the update process period set in each DC period. At least part of each of the latest first reference received power amount and second reference received power amount up to the upper limit value of is reduced, and the first reference received power amount and the second reference received power amount of each DC period As the elapsed time from the start point increases for each first unit time, the values are reset so that they monotonously increase from the current point until they reach the respective upper limit values, and stored in the data storage unit 11. This is a process of recording and updating the already recorded first reference received power amount and second reference received power amount.

Both the first update process and the second update process are executed when it is determined in the update condition determination process, which will be described later, that the update condition is satisfied. This makes it easier to transmit the discharge command data in the next ((i+1)th) discharge necessity determination process, and makes it difficult to transmit the charge permission data in the charge availability determination process.

In the present embodiment, the update processing period starts at the end of the first initial period described above (after TS1 has elapsed from the start of the DC period (i=0)), and starts at the start of the first end preparation period (DC It ends before the end of the period (TE1 before i=30). The end point of the update processing period is preferably near or after the middle point of the DC period, and the length TU of the update processing period is preferably 30% or more and 70% or less of the DC period length TD. In the present embodiment, the length TU of the update processing period is set to 50% of the length TD of the DC period, as an example, and the update processing period is in the range of i=5-20.

FIG. 6 shows the ith 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).

As shown in FIG. 6, the update condition determination process (step #16) performed by the update processing unit 14 is performed by the storage battery control unit 13 during the period from the elapsed time T(i−1) to the elapsed time T(i). Integral received power amount PA(i), which is the processing result of the consumer data reception process and the integrated received power amount calculation process (step #10), which are repeatedly performed every two unit times (1 second), and the remaining power storage capacity included in the storage battery data D2. In order to use PB(i), it must be performed after the end of the consumer data reception process and the integrated power reception amount calculation process (step #10). data reception processing, integrated power reception amount calculation processing, discharge necessity determination processing, chargeability determination processing, and control command processing).

In the update condition determination process (step #16), it is determined whether or not the current time (number of times i has elapsed) is within the update process period range (i=5 to 20) (first update condition) (step #161). If within the processing period (YES branch), the first update process (step #17) and the second update process (step #18) have not yet been performed within the update process period, or each has been performed once. If so, it is determined whether or not a predetermined time has passed (second update condition) after the most recent first update process and second update process were performed (step #162).

In determining the second update condition, if the first update process and the second update process have already been performed, whether a predetermined time has passed after the most recent first update process and second update process have been performed In determining whether or not, for example, each time the first update process and the second update process are performed, the elapsed count ix at that time is updated and recorded, and the current elapsed count i and the most recent first update process are recorded. and the difference (i-ix) between the elapsed times ix when the second update process is performed is greater than or equal to a predetermined number of times n (in this embodiment, 5 as an example). If (i-ix)≧5, the second update condition is satisfied (YES branch of step #162). In this embodiment, the predetermined number of times n is the same as the number of lapses (5 in the example shown in FIGS. 2 and 4) corresponding to the length TS1 of the first initial period, but it may be 1 or more. It is preferable to set so that only the second update condition is satisfied at least two times, preferably three times or more, without considering other update conditions, within the update processing period.

If it is determined in step #162 that the second update condition is satisfied (YES branch), the remaining storage capacity PB(i) is greater than or equal to the full charge determination value PBF for determining whether or not it is close to the fully charged state ( PB(i)≧PBF) and the accumulated received power amount PA(i) is equal to or less than the received power amount judgment value PR3(i) (PA(i)≦PR3(i)) (third update condition) Determine (step #163). The full charge determination value PBF is preferably about 70% to 95% of the rated value (rated upper limit value) of the storage capacity, and is set to 80% of the rated value as an example in the present embodiment. Further, the received power amount determination value PR3(i) is less than the initial set value of the first reference received power amount PR1(i), and is preferably about 30% to 60% of the initial set value. It is set to 50% of the initial set value of one reference power reception amount PR1(i).

If it is determined in step #163 that the third update condition is satisfied (YES branch), the first update process (step #17) and the second update process (step #18) are successively executed, Terminate the processing at the current point (the number of elapsed times i). It should be noted that either of the first update process (step #17) and the second update process (step #18) may be executed first. On the other hand, in steps #161 to #163 of the update condition determination process (step #16), if none of the first to third update conditions are satisfied (each NO branch), the first update process (step # 17) and the second update process (step #18) are not performed, and the process at the present time (the number of times i have elapsed) is terminated.

In the first update process (step #17), the update processing unit 14, for example, sets the initial setting value of the first reference power reception amount PR1(i) (when the first update process is performed for the first time) or the previous first update process. resetting the first reference received power amount PR1(i) reset in step 1 from the current time (number of elapsed times i) to reaching the upper limit value PR1U as shown below and recording it in the data storage unit 11; The already recorded first reference received power amount PR1(i) is updated.

The first reference received power amount PR1(i) from the current point (elapsed number of times i) after the reset to the upper limit PR1U is reached from the current point (elapsed number of times i) to an intermediate time point (elapsed number of times (i+m1)). As T(i) increases every first unit time, it monotonously and linearly increases by a second unit increment (ΔPR12), and reaches the upper limit value PR1U from an intermediate time point (the number of elapsed times (i+m1)). Until then, as the elapsed time T(i) increases every first unit time, it monotonically and linearly increases by a third unit increment (ΔPR13). Here, as shown in FIG. 2 or 4, the initial set value of the first reference received power amount PR1(i) monotonically and linearly increases from the end of the first initial period until it reaches the upper limit value PR1U. Assuming that the unit increase amount per first unit time is the first unit increase amount (ΔPR11), the first, second, and third unit increase amounts have the relationship shown in Equation 1 below. Therefore, if the intermediate time point (elapsed number of times (i−k+m1)) set in the previous first update process (elapsed number of times (i−k)) is later than the current time point (elapsed number of times i) (k<m1 ) replaces the previous intermediate time point (elapsed count (i−k+m1)) with the current intermediate time point (elapsed count (i+m1)). It is preferable that the number of times m1 is equal to or a value (4 or 6) before or after the number of elapsed times (5 in the embodiment shown in FIGS. 2 and 4) corresponding to the length TS1 of the first initial period.

[Number 1]
0<ΔPR12≦ΔPR11<ΔPR13

Here, in the example shown in FIG. 2 or FIG. 4, the first unit increase (ΔPR11) is 3.667%×target value PT and 3.52%×target value PT, respectively, so the second unit increase The amount (ΔPR12) is preferably set to about 3.5%×target value PT or less, more preferably about 1.5% to 3%×target value PT. As for the third unit increment (ΔPR13), when the number of times m from the current point to the intermediate point is determined, the second unit increment (ΔPR12) and the first reference power reception amount PR1(i) reach the upper limit value PR1U. Determined uniquely from the number of elapsed times. Also, the second unit increase amount (ΔPR12) may be constant throughout the DC period, or may change for each first update process. From the above, the amount of increase (ΔPR12×m1) in the first reference power reception amount PR1(i) from the current point (elapsed number of times i) to the intermediate time (elapsed number of times (i+m1)) after resetting is Assuming that the number of times m1 is 5, which is the same as the predetermined number of times n of the second update condition, the amount of increase (ΔPR12×m1) is preferably about 16.5% or less of the target value PT, and 7.5% of the target value PT. It is more preferable to set it to about 12.5%.

In the second update process (step #18), the update processing unit 14, for example, sets the initial setting value of the second reference power reception amount PR2(i) (when the second update process is performed for the first time) or the previous second update process. The end point of the period (for convenience, referred to as "0% period") during which the target value PT of the second reference power reception amount PR2(i) reset in step 2 is set to 0% is defined as the current time (elapsed number of times i ) to a predetermined time (elapsed number of times (i+m2)), record in the data storage unit 11, and update the already recorded second reference received power amount PR2(i). In the present embodiment, the number of times m2 is the same as the number of times m1 of the first update process (step #17), the number of elapsed times corresponding to the length of the first initial period TS1 (5 in the embodiment shown in FIGS. 2 and 4). is preferably equal to or around (4 or 6).

FIG. 7 shows how the set value of the first reference power reception amount PR1(i) changes in the first updating process (step #17) twice, and FIG. It shows how the set value of the second reference power reception amount PR2(i) changes in the process (step #18). In FIG. 7, PR1(i) is the initial setting value (solid line), PR1-1(i) is the setting value after the first update process (dashed line), and PR1-2(i) is the second The setting values (one-dot chain lines) after the first update process are shown respectively. In FIG. 8, PR2(i) is the initial set value (solid line), PR2-1(i) is the set value after the first second update process (dashed line), and PR2-2(i) is 2 The set values (one-dot chain lines) after the second update process for the second time are respectively shown. In FIGS. 7 and 8, as an example, when n=m1=m2=5, the range of update processing periods is i=5 to 20, and the number of elapsed times i is 5 and 10, the first to third update conditions are satisfied. and the second update condition is not satisfied when the number of times i has elapsed is 6 to 9. As an example, the second unit increase amount (ΔPR12) of the first update process (step #17) twice is 2%×target value PT for the first time, and 2.5%×target value PT for the second time. have set.

As shown in FIG. 7, in the first update process (elapsed count i=5), the intermediate point is set to the elapsed count i=10, and the first reference received power amount PR1(10) at the intermediate point is set to 20 %×PT. Next, in the second first update process (elapsed count i=10), the intermediate point is set to the elapsed count i=15, and the first reference received power amount PR1(15) at the intermediate point is PR1(15)= 32.5%×PT.

Furthermore, as shown in FIG. 8, in the first second update process (elapsed count i=5), the end point of the 0% period of the second reference power reception amount PR2(i) is set to the initial set value (i=5 ) is extended to the elapsed count i = 10, and in the second update process (the elapsed count i = 10), the end point of the 0% period is extended from the first elapsed count i = 10 to the elapsed count i = 15.

[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-described embodiment, the second reference received power amount PR2(i) is set in advance, and the storage battery control unit 13 performs step #13 (charging availability determination processing), step #14 (second remaining storage capacity Confirmation process) and step #15c (charge command process) have been described, but the storage battery control unit 13 does not perform each process of steps #13, #14, and #15c, and in the determination of step #11 If PA(i)≤PR1(i) (NO branch), step #15b (standby command processing) in step #15 (control command processing) may be performed. That is, there are two types of control modes: "discharge" and "standby" (in this case, standby for discharge). Leave it to the system 2 side. Therefore, it is not necessary to set the second reference received power amount PR2(i) in advance and record it in the data storage unit 11. Furthermore, the update processing unit 14 executes the second update process to set the second reference power amount PR2(i). There is no need to reset the power reception amount PR2(i) and record it in the data storage section 11 .

On the other hand, when the storage battery system 2 receives a standby command as the control command data DC from the system 1, it decides whether or not to charge according to a preset algorithm based on the remaining storage capacity at that time. may be determined to perform the charging process. However, in this case, even when PA(i)≧PR2(i), the storage battery system 2 may charge the storage battery 21 .

<3> In the above embodiment, as a preferred embodiment of the initial set value of the first reference received power amount PR1(i), as shown in FIGS. The difference ΔP1(i) (=PAT(i)−PR1(i)) obtained by subtracting the received power amount PR1(i) is the first initial period until a predetermined time elapses from the start point (i=0) of each DC period. , increases monotonically, reaches the maximum positive value at the end of the first initial period, and monotonically increases from the end of the first initial period until the first reference received power amount PR1(i) reaches the upper limit PR1U. Although it is assumed that the first reference power reception amount PR1(i) is set to decrease, 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.

<4> In the above embodiment, the second reference received power amount PR2(i) is set to 0% of the target value PT in the first initial period, so charging of the storage battery system 2 is not permitted.

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

If the second reference received power amount PR2(i) is set to monotonically increase from the start point to the end point of the first initial period, then in the second update process, the second reference received power amount PR2(i ), instead of extending the end point of the 0% period from the current time (elapsed number of times i) to a predetermined time later (elapsed number of times (i+m2)), an intermediate point similar to the first update process described above is set or replaced. process should be adopted.

<5> 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.

<6> In the above-described 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.

<7> 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.

<8> In the above embodiment, the processing procedure and details of each process performed by the update processing unit 14 illustrated in FIG. 6 are an example, and are not limited to the processing procedure and details shown in FIG.

In the above embodiment, the series of processes performed by the update processing unit 14 (the update condition determination process, the first update process, and the second update process) is the same as the series of processes performed by the storage battery control unit 13 (the consumer data reception process, the integrated power reception process). A case of starting after the amount calculation process, the discharge necessity determination process, the chargeability determination process, and the control command process) is assumed. However, the update condition determination process (step #16) may be started after the consumer data reception process and the integrated power reception amount calculation process (step #10). It may be started prior to the chargeability determination process and the control command process.

However, in the above-described embodiment, the timing at which the storage battery control unit 13 reads out the first reference received power amount PR1(i) and the second reference received power amount PR2(i) stored in the data storage unit 11 is set at step #11. And since it is step #13, after the update processing unit 14 performs the first update process and the second update process, the updated first reference received power amount PR1(i) and second reference received power amount PR2(i) will be read out. In order to prevent reading of the first reference received power amount PR1(i) and the second reference received power amount PR2(i) after such updating, the first reference received power amount PR1(i) and the second reference received power amount PR2(i) may be read before the first update process and the second update process, for example, before the start of step #10 or immediately after the end. That is, the first update process and the second update process performed by the update processing unit 14 are performed after the first reference received power amount PR1(i) and the second reference received power amount PR2(i) are read from the data storage unit 11. There is a need.

As yet another embodiment, when the update condition determination process (step #16) is executed prior to steps #11 and #13, in steps #11 and #13, the data read out earlier in the update condition determination process Alternatively, the first reference received power amount PR1(i) and the second reference received power amount PR2(i) may be used.

Further, the order of the determination processes (steps #161 to #163) of the first to third update conditions in the update condition determination process (step #16) can be changed arbitrarily. Further, in the process of determining the third update condition in step #163, the remaining power storage capacity PB(i) is equal to or greater than the full charge determination value PBF (PB(i)≧PBF), and the accumulated power receiving amount PA(i) is Although it is determined that the third update condition is satisfied when the received power amount determination value PR3(i) or less (PA(i)≦PR3(i)), the former of the third update condition is the remaining power storage capacity PB ( i) may exceed the full charge determination value PBF (PB(i)>PBF), and the latter of the third update condition is that the accumulated received power amount PA(i) is less than the received power amount determination value PR3(i) ( PA(i)<PR3(i)).

Furthermore, the first update process (step #17) is not limited to the process described in the above embodiment. For example, the first reference received power amount PR1(i) after resetting does not necessarily increase linearly from the current time point (the number of elapsed times i) to the intermediate time point (the number of elapsed times (i+m1)). It does not necessarily have to increase linearly from the elapsed count (i+m1) until it reaches the upper limit value PR1U.

Furthermore, the second update process (step #18) is not limited to the process described in the above embodiment. For example, the reset second reference received power amount PR2(i) does not necessarily increase linearly from the end of the 0% period (the number of elapsed times (i+m2)) until it reaches the upper limit value PR2U.

<9> 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 and update processing unit 14 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. data bus.

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 14: update processing unit 2: storage battery system 21: storage battery 22: controller 23: communication device 3: data communication path 4: power meter

Claims (16)

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 that records a first reference received power amount that serves as a reference for determination;
a data communication unit that transmits and receives data to and from the storage battery system;
comprising a storage battery control unit and an update processing unit,
In each DC period, the first reference received power amount monotonically increases from a lower limit value to an upper limit value as the elapsed time increases for each first unit time. It is set as an initial setting value before the start time,
The data communication unit receives, at a predetermined reception timing, received power amount data indicating the accumulated amount of received power from the start time point to the elapsed time period, and storage battery data including the remaining power storage capacity of the storage battery system;
The storage battery control unit determines a magnitude relationship between the integrated received power amount and the first reference received power amount for each of the first unit time based on the received power amount data, and determines whether the integrated received power amount is the first reference. When it is determined that the amount of received power is greater than or exceeds the amount of power received, transmitting discharge command data to the storage battery system via the data communication unit,
The update processing unit updates, for each first unit time within a predetermined update processing period within each DC period, between the integrated received power amount and the first reference received power amount for the next and subsequent times for each first unit time. For use in determining the magnitude relationship, the remaining power storage capacity is equal to or greater than a full charge determination value for determining whether or not the remaining power storage capacity is close to a fully charged state, and the integrated received power amount is less than the first reference received power amount. value of at least a part of the latest first reference received power amount from the current time point to the upper limit value when an update condition including at least being less than or less than the received power amount judgment value set in the is decreased so that the first reference received power amount monotonically increases from the current point to the upper limit value as the elapsed time increases every first unit time. and record it in the data storage unit, perform a first update process of updating the already recorded first reference received power amount, and if the update condition is not satisfied, perform the first update process without
The update processing period is a period from after a predetermined time equal to or longer than the first unit time has elapsed from the start of each DC period to a predetermined time equal to or longer than the first unit time has elapsed from the end of the DC period. A storage battery control system characterized by: 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 monotonously increases during a first initial period from the start point of each DC period to the start point of the update processing period, and the first initial period ends. The initial setting of the first reference received power amount is the maximum positive value at the point in time, and monotonically decreases from the end of the first initial period until the first reference received power amount reaches the upper limit value. 2. The storage battery control system according to claim 1, wherein a value is set. In each DC period, the initial set value of the first reference received power amount changes from the end of the first initial period until the first reference received power amount reaches the upper limit, and the elapsed time is the first It is set to monotonically and linearly increase by the first unit increment as it increases every unit time,
The update processing unit, in the first update process,
The first reference received power amount is monotonically and linearly reduced to the first unit increment or less as the elapsed time increases for each first unit time from the current point to an intermediate point after a predetermined delay time. increasing by a second unit increment, monotonically and linearly as the elapsed time increases every first unit time from the intermediate point until the first reference received power amount reaches the upper limit, Reset to increase by a third unit increment larger than the first unit increment;
When the first update process is the second or subsequent first update process, and the previous intermediate time point set in the previous first update process exists after the current time point, the previous intermediate time point is newly set. 3. The storage battery control system according to claim 2, wherein the intermediate time point is substituted. The length of the first initial period is set to 10% or more and 30% or less of the length of the DC period,
4. 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 at the end of the first initial period. The storage battery control system according to . In the update condition, if the first update process has not yet been performed within the update process period, or if the first update process has already been performed once or more within the update process period, the most recent 5. The storage battery control system according to any one of claims 1 to 4, further comprising that a predetermined period of time has elapsed after said first update process of is performed. 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. After the end of the update process period and within a first end preparation period within a predetermined time immediately before the end of the DC period, the initial set value of the first reference received power amount and the value after the first update process The storage battery control system according to any one of claims 1 to 6, wherein the set value maintains the upper limit value. 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. 8. The storage battery control system according to claim 7. 9. The method according to any one of claims 1 to 8, wherein the lower limit value is set to 0% or more and 5% or less of the target value, and the upper limit value is set to 95% or more and 99% or less of the target value. The storage battery control system according to any one of claims 1 to 3. Claims 1 to 9, wherein the received power amount determination value is set to 30% or more and 60% or less of the initial setting value of the first reference power reception amount at each elapsed time of the update processing period. The storage battery control system according to any one of 1. The data storage unit determines whether or not to permit charging of the storage battery system with respect to the integrated received power amount in each of the elapsed times from the start point of each DC period for each of the first unit times. The second standard received power amount that serves as a standard is recorded,
In each DC period, the second reference received power amount monotonically increases from the lower limit value to the upper limit value without decreasing midway as the elapsed time increases for each first unit time. and, except for the start time and end time of the DC period, in each of the elapsed times of the first unit time, the received power amount is less than the first reference amount, and An initial set value is set before the start time of each DC period so that the received power amount is equal to or less than the first reference power amount at each end time,
The storage battery control unit
determining a magnitude relationship between the integrated received power amount and the second reference received power amount for each of the first unit time based on data indicating the integrated received power amount from the start time to the elapsed time;
transmitting charging permission data to the storage battery system via the data communication unit when it is determined that the integrated received power amount is less than the second reference received power amount;
The update processing unit
If the update condition is satisfied every first unit time within the update process period, in addition to the first update process, the integrated power reception amount and the first 2. In order to determine the magnitude relationship with the reference received power amount, at least a part of the value of the latest second reference received power amount from the current point up to the upper limit value is decreased, and the second reference received power amount is reduced. is reset so that it monotonically increases from the current time point to the upper limit value as the elapsed time increases every time the first unit time, without decreasing, and stored in the data storage unit A second update process is performed for recording and updating the already recorded second reference received power amount, and if the update condition is not satisfied, the first update process and the second update process are not performed. The storage battery control system according to any one of claims 1 to 10. In a first initial period from the start point of each DC period to the start point of the update processing period, the initial set value of the second reference received power amount is set to 0% of the target value,
The update processing unit determines the end point of the period in which the second reference received power amount is set to 0% of the target value in the second update process every first unit time within the update process period. 12. The storage battery control system according to claim 11, wherein the delay is made from the present time to a predetermined time later. 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 13. The storage battery control system according to claim 11 or 12, wherein the transmission is not performed. The storage battery control unit determines a magnitude relationship between the integrated received power amount and the second reference received power amount for each of the first unit time, and then transmits the discharge command data when the charging permission data is not transmitted. 14. The storage battery control system according to any one of claims 11 to 13, wherein the standby command data is transmitted except when the storage battery control system. A program for causing a computer to function as the storage battery control unit and the update processing unit of the storage battery control system according to any one of claims 1 to 14. A computer-readable recording medium recording a program for causing a computer to function as the storage battery control unit and the update processing unit of the storage battery control system according to any one of claims 1 to 14.

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