JP2017046537A - Power storage system, adapter device, storage battery device and power storage system control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage system which can securely contribute to a peak cut if a general-purpose power storage system is used.SOLUTION: A power supply system 10 is connected to power reception equipment 20, which supplies power from a system 6 to a single-phase load 51 and a three-phase load 41, and a demand controller 30 which, according to the power reception energy acquired from the power reception equipment 20, outputs a state corresponding to whether or not to execute demand suppression. The power supply system 10 includes: a storage battery device 11 which supplies charged power to the single-phase load 51; and an adapter device 12 which detects the state output from the demand controller 30, and according to the state output from the demand controller 30, generates a mode shift signal which the storage battery device 11 can acquire.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power storage system, an adapter device, a storage battery device, and a method for controlling the power storage system.

  In high-voltage power receiving contracts in Japan, the average power consumption for each specific demand period (for example, 30 minutes) is monitored, and the basic electricity bill is calculated by the power company based on the average power consumption for the demand period, which peaked throughout the year. It is a mechanism to be set. Therefore, conventionally, peak demand cut (hereinafter also simply referred to as peak cut) is performed to reduce the maximum average power consumption within the demand period (hereinafter also referred to as maximum demand) and keep the basic electricity bill low. Is desired by each consumer. In order to perform peak cutting, a device called a demand controller is used. The demand controller monitors the amount of received power within the demand time limit of the entire customer facility, and controls so as to suppress the amount of received power at the peak time of power demand. One method of peak cut is to output a suppression instruction when the demand controller determines to suppress the amount of received power within the demand time period, and the load that detects the suppression instruction suppresses or stops the operation. That is.

  Another method of peak cut is to discharge the power storage system introduced into the customer facility at an appropriate timing when it is necessary to suppress the amount of received power within the demand time period. In many general-purpose power storage systems, a time period for discharging by a timer is set in advance. For example, Patent Document 1 discloses a configuration in which discharge is performed based on a time sequence set in advance based on power demand prediction. Alternatively, for example, Patent Document 2 shows a configuration in which a bidirectional inverter is discharged from a power storage system so as to be operated at a rated output when the amount of received power within a demand time limit of a customer facility exceeds a predetermined value. Yes.

JP 2000-92717 A Japanese Patent Laying-Open No. 2015-56996

  However, in the configuration shown in Patent Document 1, in order to increase the accuracy of discharging at the timing when the demand controller determines to execute the suppression of the amount of received power within the demand time period, it is necessary to set a long discharge time zone in advance. Yes, a large amount of power storage capacity is required. In addition, the possibility of a sudden peak in power demand that deviates from the preset discharge time period cannot be excluded, and as a result, the peak power cannot be cut and the amount of power received within the demand time limit becomes large. There is. That is, when a general-purpose power storage system is used as it is, it is difficult to reliably cut the peak and reduce the maximum amount of received power within the demand time period. On the other hand, when introducing a special power storage system as shown in Patent Document 2, a great investment is required.

  Therefore, the present invention has been made in view of the above points, and a power storage system, an adapter device, a storage battery device, and a method for controlling a power storage system that can reliably contribute to peak cutting without requiring a large amount of cost. The purpose is to provide.

In order to solve the above-described problem, an electricity storage system according to an embodiment of the present invention includes:
A power receiving facility that supplies power from the grid to a single-phase load and a three-phase load; and a demand controller that outputs a state corresponding to whether to perform demand suppression according to the amount of received power acquired from the power receiving facility; A power storage system connected to
A storage battery device for supplying charged power to the single-phase load;
An adapter device that detects a state output from the demand controller and generates a mode transition signal that can be acquired by the storage battery device in accordance with the state output from the demand controller.

In order to solve the above problems, an adapter device according to an embodiment of the present invention includes:
A demand controller that outputs a state corresponding to whether or not demand suppression is performed according to the amount of received power acquired from the power receiving equipment that supplies power from the grid to the single-phase load and the three-phase load, and the charged power Connected to the storage battery device that supplies the single-phase load,
A state output from the demand controller is detected, and a mode transition signal that can be acquired by the storage battery device is generated according to the state output from the demand controller.

In order to solve the above problems, a storage battery device according to an embodiment of the present invention is:
A power receiving facility that supplies power from the grid to a single-phase load and a three-phase load; and a demand controller that outputs a state corresponding to whether to perform demand suppression according to the amount of received power acquired from the power receiving facility; Connected to
Supply the charged power to the single-phase load,
The state output from the demand controller is detected.

In order to solve the above problems, a method for controlling a power storage system according to an embodiment of the present invention includes:
A power receiving facility that supplies power from the grid to a single-phase load and a three-phase load; and a demand controller that outputs a state corresponding to whether to perform demand suppression according to the amount of received power acquired from the power receiving facility; Is a storage system control method comprising a storage battery device connected to the single-phase load to supply the charged power,
Detecting a state output from the demand controller;
Generating a mode transition signal that can be acquired by the storage battery device in accordance with a state output from the demand controller.

  According to the power storage system, the adapter device, the storage battery device, and the control method for the power storage system of the present invention, it is possible to reliably contribute to peak cutting without requiring a great deal of cost.

It is a schematic diagram of a customer facility to which a power storage system according to an embodiment is connected. It is a flowchart which shows operation | movement of a demand controller. It is a graph which shows transition of an intermediate demand value within a demand time limit. It is a transition diagram of the operation mode of a storage battery apparatus. It is a flowchart in which a storage battery apparatus changes operation mode. It is a flowchart in which an adapter apparatus produces | generates a mode transition signal. It is the schematic which shows the connection of the demand controller which concerns on the modification 1, and load.

(Embodiment)
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[overall structure]
FIG. 1 is a schematic diagram of a customer facility 1 to which a power storage system 10 according to an embodiment is connected. The customer facility 1 includes a power storage system 10, a high-voltage power receiving device (also referred to as a power receiving facility or cubicle) 20, a demand controller 30, a power distribution board 40, and a lamp distribution board 50. A solid line connecting each component indicates a power line, and a broken line indicates a communication line.

<High voltage power receiving device>
The high-voltage power receiving device 20 includes a power meter 21, a power sensor 22, and a transformer 23, and the power meter 21 and the transformer 23 are connected by a power line. The high-voltage power receiving device 20 is connected to the system 6 via the power meter 21 and receives three-phase power. The power meter 21 measures the amount of power received by the high-voltage power receiving device 20 (hereinafter also referred to as received power amount). The high-voltage power receiving device 20 is connected to the power distribution board 40 and the lamp distribution board 50 via the transformer 23. Three-phase power received from the system 6 is input to the primary side of the transformer 23, and three-phase power and single-phase power are output to the secondary side of the transformer 23. The three-phase power and single-phase power output from the transformer 23 are supplied to the power distribution board 40 and the lamp distribution board 50, respectively. The voltage of the three-phase power input to the primary side of the transformer 23 is 6600 V, for example, but is not limited thereto. From the secondary side of the transformer 23, three-phase power is output with three wires, and the voltage of the three-phase power is 6600 V, for example, but is not limited thereto. In addition, single-phase power is output from the transformer 23 with three or two wires, and the voltage of the single-phase power is, for example, 200 V / 100 V, but is not limited thereto.

  The power sensor 22 is connected to the power meter 21. The power sensor 22 is connected to the demand controller 30. The power meter 21 outputs a pulse each time the measured power amount reaches a predetermined power amount. The number of pulses to be output is, for example, 50000 pulses per 1 kWh of electric energy (1 pulse every 0.02 Wh), but is not limited thereto. The power sensor 22 detects the pulse output from the power meter 21, amplifies and shapes the pulse, and outputs the pulse to the demand controller 30.

<Demand controller>
The demand controller 30 includes a demand control unit 31 and a storage unit 32. The demand controller 30 is connected to the power sensor 22 of the high-voltage power receiving device 20. The demand controller 30 is connected to relays 33-1 and 33-2 (hereinafter collectively referred to as relay 33) and the display device 34. Although two relays 33 are shown in FIG. 1, the number is not limited to this, and may be three or more. The demand controller 30 detects pulses output from the power sensor 22 of the high-voltage power receiving device 20 and integrates the number of pulses, whereby the high-voltage power receiving device 20 acquires the received power amount. Here, the amount of received power is the product of the number of pulses and a predetermined amount of power.

  The relay 33 is a non-voltage contact relay and is controlled by the demand controller 30 so as to be turned on or off. Both ends of the relay 33 are connected to the power storage system 10 provided on the lamp distribution board 50 side, the adapter device 12 connected to the power distribution board 40 side, the external control adapter 44 provided on the power distribution board 40 side, etc. And the external device detects whether the relay 33 is on or off. In FIG. 1, both ends of the relay 33-1 are connected to the adapter device 12 connected to the power storage system 10, and both ends of the relay 33-2 are connected to the external control adapter 44 connected to the power load 41. The relay 33 may be a mechanical switch having a movable part, or may be a switching element constituted by a semiconductor element. Moreover, the relay 33 may be a voltage contact relay and may output a voltage signal.

  The demand controller 31 of the demand controller 30 determines whether or not to execute demand suppression based on the amount of power received by the high-voltage power receiving device 20. The determination method will be described later. When it is determined to execute demand suppression, the demand control unit 31 controls the relay 33 to be in an ON state, and outputs a state corresponding to execution of demand suppression to the adapter device 12 or the external control adapter 44. To do. In addition, when it is determined not to execute demand suppression, the demand control unit 31 controls the relay 33 to be in an OFF state, and the adapter device 12 or the external control adapter 44 has a state corresponding to not executing demand suppression. Output. In other words, the relay 33 being in the ON state indicates a state corresponding to the demand control unit 31 executing demand suppression. Moreover, the relay 33 being in the off state indicates a state corresponding to the demand control unit 31 not performing demand suppression.

  The display device 34 displays the amount of received power acquired by the demand controller 30. The display device 34 displays information output from the demand controller 30. The display device 34 may be a terminal such as a PC, a simple display, or a warning light.

<Distribution panel>
As described above, the power distribution board 40 is connected to the transformer 23 of the high-voltage power receiving device 20 by three wires and receives three-phase power. A power load (three-phase load) 41 is connected to the power distribution board 40. The power load 41 is an air conditioner, for example, but is not limited thereto. In FIG. 1, the power load 41 includes an outdoor unit 42 and an indoor unit 43 of an air conditioner. The outdoor unit 42 is connected to the external control adapter 44. As described above, the external control adapter 44 is connected to both ends of the relay 33-2 and can detect the state of the relay 33-2. The external control adapter 44 controls the operating state of the outdoor unit 42 according to the state of the relay 33-2. Specifically, when it is detected that the relay 33-2 is in an on state, that is, when the demand controller 30 determines to execute demand suppression, the outdoor unit 42 is forcibly stopped.

  As described above, the lamp distribution board 50 is connected to the transformer 23 of the high-voltage power receiving device 20 by two lines or three lines, and receives single-phase power. A lamp load (single phase load) 51 is connected to the lamp distribution board 50. Although the electric lamp load 51 is a small apparatus used by single phase 100V or 200V, for example, it is not restricted to this. In addition, the power storage system 10 and the photovoltaic power generation device (PV) 15 are connected to the lamp distribution board 50 via the power conditioner 14. The PV 15 may supply the generated power to the lamp load 51 or the power storage system 10 via the power conditioner 14.

<Power storage system>
The power storage system 10 includes a storage battery device 11 and an adapter device 12, and the storage battery device 11 and the adapter device 12 are connected. Moreover, the adapter apparatus 12 may be arrange | positioned inside the storage battery apparatus 11, and is good also as a different body.

  The storage battery device 11 is connected to the lamp distribution board 50 via the power conditioner 14, and can charge single-phase power with the electric power received from the lamp distribution board 50. The storage battery device 11 may be connected to the PV 15 via the power conditioner 14 and may be charged with single-phase power by the power generated by the PV 15. In addition, a specific load 13 is connected to the storage battery device 11, and single-phase power is supplied to the specific load 13 by discharging the storage battery device 11. The specific load 13 is, for example, a small device used at a single-phase 100V or 200V, but is not limited thereto. Further, when the storage battery device 11 is discharged, single-phase power may be supplied to the lamp load 51 via the power conditioner 14 and the lamp distribution board 50. The storage battery device 11 includes a power storage control unit 111. The power storage control unit 111 controls charging / discharging of the storage battery device 11. The power storage control unit 111 can be connected to a network and can acquire a signal from an external server or the like, or can transmit a signal to the external server or the like. The power storage control unit 111 does not have a function of directly detecting a state output from the demand controller 30 and corresponding to whether to execute demand suppression.

  As described above, the adapter device 12 is connected to both ends of the relay 33-1 and can detect the state of the relay 33-1. The adapter device 12 includes an adapter control unit 121. The adapter control unit 121 generates a mode transition signal that instructs the storage battery device 11 to change the operation mode according to the state of the relay 33-1, and transmits the mode transition signal to the storage battery device 11. When the power storage control unit 111 of the storage battery device 11 acquires a mode transition signal from the adapter device 12, the power storage control unit 111 transitions its own operation mode based on the mode transition signal. The transition of the operation mode of the storage battery device 11 will be described later.

[Control method of demand suppression]
The demand controller 30 determines whether or not to execute demand suppression so that the average power used within the demand time limit (hereinafter also referred to as a demand value) does not exceed a preset target power. Hereinafter, the determination method will be described.

<About electricity charges>
Prior to a specific description of the operation of the demand controller 30, the necessity of demand suppression will be described through a method for determining the electricity rate of a large-scale consumer facility in order to contribute to the understanding thereof. An electric power company that supplies power through the grid 6 adopts a rate system in which the electricity rate increases according to the maximum demand value (hereinafter also referred to as the maximum demand) from the viewpoint of peak cuts in power demand. For example, the electric power company calculates the sum of the basic electricity charge proportional to the maximum demand and the used electricity charge proportional to the amount of power used as the electricity charge of the customer facility 1. Therefore, even if the amount of power used per month is the same, if the maximum demand is kept small by peak cut, the basic electricity charge will be reduced and the total amount of electricity will be reduced. Therefore, it is necessary to suppress demand for peak cut. Of course, if the amount of power used by the customer facility 1 as a whole is reduced by supplying the power generated by the PV 15 to the lamp load 51, the electricity bill can be further reduced.

  In order to use the maximum demand for the calculation of the electricity rate as described above, in a large-scale consumer facility that receives electricity at a high voltage or an extra high voltage, the demand is usually determined from the amount of received power within the demand time period measured by the power meter 21. A value is calculated. This demand value is calculated for each demand time period. When the demand time period is 30 minutes, 48 demand values per day and 1440 demand values per month (in the case of 30 days) are calculated. Then, the maximum demand value among the demand values calculated in one month is set as the maximum demand for the month. Furthermore, the maximum demand of the month or the maximum demand during the past year is calculated and used to calculate the basic electricity rate. That is, if a large demand value occurs even once in one month or one year, the maximum demand becomes large, and the basic electricity rate based on the maximum demand is applied for the next month or the next year.

  Here, the demand time period is a unit time for calculating the average power consumption. In Japan, it is determined to be 30 minutes, but differs depending on the country, for example, 60 minutes in the United States and 15 minutes in Germany. ing. Hereinafter, the description will be made assuming that the demand time limit is 30 minutes.

<Operation flow of demand controller>
FIG. 2 is a flowchart showing the operation of the demand controller 30, and the operation of the demand controller 30 will be described below using this flowchart.

  First, the demand controller 31 of the demand controller 30 starts control in a new demand time period (step S1). Subsequently, the demand control unit 31 resets the accumulated pulse number, which is a variable for accumulating and storing the number of pulses acquired from the power sensor 22 of the high-voltage power receiving device 20, to 0 (step S2).

Next, the demand control unit 31 determines whether the demand time limit has expired (step S3). When the demand time limit expires (step S3: YES), the demand control unit 31 stores the accumulated pulse number at the time when the demand time limit expires in the storage unit 32 of the demand controller 30 (step S4). The stored value may be the accumulated pulse number itself or a demand value converted from the accumulated pulse number. The demand control unit 31 can calculate the demand value by the following equation (1).
(Demand value) = (Total number of pulses) x (Predetermined power consumption) / (Length of demand time limit) (1)
Here, the length of the demand time period is 1800 seconds (30 minutes). The accumulated pulse number or demand value stored in the storage unit 32 may be provided to an electric power company and used for calculation of an electricity bill.

  If the demand time limit has not expired (step S3: NO), the demand control unit 31 proceeds to step S5. The demand control unit 31 is below a criterion for determining that the number of integrated pulses does not execute demand suppression, that is, a criterion for determining that demand suppression is canceled when demand suppression is already performed (hereinafter also referred to as a cancellation criterion). It is determined whether or not there is (step S5). Cancellation criteria will be described later.

  When the integrated pulse number is equal to or less than the release reference (step S5: YES), the demand control unit 31 releases the demand suppression (step S6) and proceeds to step S7. When canceling demand suppression, the demand control unit 31 controls the relay 33 to be turned off as described above, and outputs a state corresponding to not executing demand suppression to an external device. If demand suppression is not originally executed, the process proceeds to step S7 without doing anything. If the integrated pulse number is not less than the release reference (step S5: NO), the demand control unit 31 does nothing and proceeds to step S7.

  Subsequently, the demand control unit 31 determines whether a pulse is acquired from the power sensor 22 of the high-voltage power receiving device 20 (step S7). When the pulse is acquired (step S7: YES), the demand control unit 31 adds the acquired number of pulses to the integrated pulse number (step S8), and proceeds to step S9. When the pulse is not acquired (step S7: NO), the demand control unit 31 does nothing and proceeds to step S9.

  Subsequently, the demand control unit 31 determines whether or not the accumulated pulse number is equal to or greater than a criterion (hereinafter, also referred to as a suppression criterion) that is determined to execute demand suppression (step S9). The suppression criteria will be described later.

  When the integrated pulse number is equal to or greater than the suppression reference (step S9: YES), the demand control unit 31 executes demand suppression (step S10) and returns to step S3. When executing demand suppression, the demand control unit 31 controls the relay 33 to be turned on as described above, and outputs a state corresponding to executing demand suppression to an external device. If demand suppression was originally executed, the process returns to step S3 without doing anything. If the integrated pulse number is not equal to or greater than the suppression reference (step S9: NO), the demand control unit 31 returns to step S3 without doing anything.

  The operation of the demand controller 30 has been described with reference to the flowchart of FIG. 2, but here, the suppression criterion and the cancellation criterion, which will be described later, will be described.

<Explanation of suppression criteria and cancellation criteria>
FIG. 3 is a graph showing an example of the transition of the demand value calculated as an intermediate course within the demand time period. The horizontal axis represents the elapsed time from the start of the demand time period, and the vertical axis represents the demand value. Here, the length of the demand time period is T, the elapsed time at the start of the demand time period is 0, and the elapsed time when the demand time period expires is T.

  The demand controller 31 of the demand controller 30 integrates the number of pulses acquired from the power sensor 22 of the high-voltage power receiving device 20 from the start of the demand time period. And the demand control part 31 calculates the demand value (henceforth an intermediate demand value) calculated as intermediate progress by substituting the integration pulse number from elapsed time 0 to t to the above-mentioned formula (1). . The graph of FIG. 3 shows an example of the transition of the demand value on the way, but since it is easy to convert between the demand value and the number of integrated pulses, it can be said to show an example of the transition of the integrated pulse number. Since the number of integrated pulses increases monotonically, the graph indicating the transition of the demand value on the way also monotonously increases. The midway demand value at the elapsed time T is equal to the demand value that is the average power consumption within the demand time period.

  In FIG. 3, the original contract power, warning power, and target power are represented by a one-dot chain line parallel to the horizontal axis. The original contract power is the actual value of the maximum demand when no demand suppression is performed, and the alarm power is the maximum demand to be reduced from the original contract power by performing demand suppression. The difference between the original contract power and the warning power is the demand suppression amount. The target power is a demand value (hereinafter also referred to as a target demand value) that is a target when executing demand suppression, and a value slightly lower than the alarm power is set.

  In FIG. 3, the transition target of the midway demand value is indicated by a straight line rising to the right. This line is a line obtained by connecting the origin and the point at which the demand value becomes the target power at the elapsed time T. The transition target of the midway demand value indicates the target demand value at each elapsed time t when it is assumed that the amount of power received by the high-voltage power receiving apparatus 20 within the demand time period increases constantly. The target demand value at the elapsed time T is equal to the target power.

  The transition of the midway demand value calculated by the demand controller 31 of the demand controller 30 is indicated by a curve that starts from the origin and passes through points A to E in the example of FIG. Point E indicates an intermediate demand value at the elapsed time t. A point F shown on the line representing the transition target of the midway demand value indicates the target demand value at the elapsed time t.

Based on the midway demand value indicated by the point E and the target demand value indicated by the point F, the demand control unit 31 determines whether to execute demand suppression at the elapsed time t. This determination is performed in step S9 of the flowchart of FIG. In step S9 in FIG. 2, it is determined whether the accumulated pulse number is greater than or equal to the suppression reference, but it is the same whether it is determined whether the midway demand value converted from the accumulated pulse number is greater than or equal to the suppression reference. Here, for example, a value obtained by adding a predetermined value to the target demand value indicated by the point F is defined as a suppression criterion. Hereinafter, the suppression criterion relating to the midway demand value defined here is also referred to as a suppression criterion value. The suppression reference value is expressed by the following equation (2).
(Suppression standard value) = (target demand value) + (predetermined value) (2)
If the demand control unit 31 determines that the midway demand value indicated by the point E in step S9 in FIG. 2 is equal to or greater than the suppression reference value, the demand control unit 31 can determine to execute demand suppression. In this case, the demand control unit 31 determines whether or not (intermediate demand value) ≧ (suppression reference value).

Further, if the target demand value indicated by the point F is converted into the integrated pulse number and a value obtained by adding a predetermined number is defined as the suppression reference, the demand control unit 31 determines whether the integrated pulse number is equal to or greater than the suppression reference. be able to. Hereinafter, the suppression reference relating to the number of integrated pulses defined here is also referred to as a suppression reference number. The suppression reference number is expressed by the following formula (3).
(Number of suppression standards) = (Total number of pulses converted from target demand value) + (Predetermined number) (3)
The demand control unit 31 can determine to execute demand suppression when it is determined in step S9 in FIG. 2 that the integrated pulse number converted from the midway demand value indicated by the point E is equal to or greater than the suppression reference number. In this case, the demand control unit 31 determines whether (integrated pulse number) ≧ (suppression reference number).

  Further, it may be determined whether or not the difference between the midway demand value indicated by the point E and the target demand value indicated by the point F is equal to or greater than the suppression criterion. In this case, the predetermined value itself is defined as the suppression criterion. In this case, the demand control unit 31 determines whether or not (intermediate demand value) − (target demand value) ≧ (suppression criterion).

  Here, the suppression criterion is defined using a predetermined value or a predetermined number, but is not limited thereto. For example, a value obtained by multiplying the target demand value indicated by the point F by a predetermined coefficient may be defined as the suppression criterion. Further, the suppression reference value, the predetermined value for defining the suppression reference number, the predetermined number, or the predetermined coefficient may be variable depending on the elapsed time t. For example, as the elapsed time t approaches T, the suppression reference value may approach the target demand value.

  Although the suppression criterion has been described above, the cancellation criterion can be determined in the same manner as the suppression criterion. As in the case of the suppression criterion, the predetermined value and the predetermined number determined as the cancellation reference are also referred to as the cancellation reference value and the cancellation reference number, respectively. For example, when demand suppression is being executed and it is determined that the midway demand value indicated by the point E is equal to or less than the cancellation reference value, the demand control unit 31 cancels demand suppression, that is, demand suppression. You may make it decide to stop execution.

  The suppression reference value and the cancellation reference value may be the same value or different values. Preferably, the suppression reference value is larger than the release reference value. The suppression reference value and the release reference value are values that are appropriately determined depending on the configuration of the load that is the target of demand suppression. The same applies to the case where the suppression reference number and the cancellation reference number are used.

<Description of transition example of midway demand value>
Hereinafter, the operation in which the demand control unit 31 of the demand controller 30 determines the demand suppression will be described using an example of transition of the midway demand value in FIG. Here, it is determined whether to suppress demand using the midway demand value converted from the accumulated pulse number. The suppression reference value and the release reference value are obtained by adding a positive constant to the target demand value.

  During the transition of the midway demand value from the origin to point A, the midway demand value is below the target demand value. In this section, the demand control unit 31 does not determine that the midway demand value is greater than or equal to the suppression reference value, and does not execute demand suppression.

  When the transition of the midway demand value reaches point A, the midway demand value matches the target demand value. That is, at point A, the difference between the midway demand value and the target demand value is zero. At this time, the demand control unit 31 may issue an alarm, or this alarm may be displayed by the display device 34.

  Subsequently, the midway demand value transitions from point A to point B, but demand suppression has not yet been executed in this section, and the midway demand value transitions above the target demand value. When the point B is reached, the midway demand value coincides with the suppression reference value. At this time, the demand control unit 31 determines that the midway demand value is equal to or greater than the suppression reference value (step S9 in FIG. 2: YES), and determines to execute demand suppression. In this case, the display device 34 may display that demand suppression is performed.

  Subsequently, the midway demand value changes from point B to point C, but the effect of demand suppression does not yet appear in the first half of this section, and the difference between the midway demand value and the target demand value becomes large. However, the effect of demand suppression gradually appears, and the demand value on the way approaches the target demand value again in the second half of this section. When the transition reaches point C, the demand value on the way matches the cancellation reference value. At this time, the demand control unit 31 determines that the midway demand value is equal to or less than the cancellation reference value (step S5 in FIG. 2: YES), and determines to cancel the demand suppression. In this case, since the state in which the demand value on the way exceeds the target demand value continues, the demand control unit 31 may issue an alarm, or the alarm may be displayed on the display device 34. Good.

  Subsequently, the midway demand value changes from the point C to the point D. In this section, the demand suppression effect that was executed before reaching the point C is maintained, and the increase in the midway demand value is reduced. When D is reached, the midway demand value matches the target demand value. In this case, the demand control unit 31 may cancel the alarm.

  In the transition of the demand value on the way from the point A to the point D described so far, the point controller from the point A to the point D is an alarm period in which the demand controller 30 generates an alarm, and the point from the point B to the point C is the demand. This is a suppression period during which the controller 30 executes demand suppression. When the demand controller 30 executes demand suppression for an air conditioner, the demand controller 30 performs control to shorten the suppression period in this way in order to keep the operating rate of the air conditioner as high as possible and prevent the comfort index from being lowered.

  Subsequently, the midway demand value changes from point D to point E, and reaches an elapsed time t. Here, the broken line starting from the point E is a line indicating a transition prediction of the demand value halfway from the elapsed time t to the elapsed time T. The demand value indicated by the transition prediction line at the elapsed time T is referred to as predicted power. The predicted power is a demand value predicted to be reached when the power consumption is kept constant without executing demand suppression after point E. In the example of FIG. 3, the predicted power exceeds the warning power. In such a case, the demand control unit 31 of the demand controller 30 performs the demand suppression based on the fact that the predicted power exceeds the alarm power even if the demand value is not equal to or greater than the suppression reference value. It may be.

  The operation of the demand controller 30 has been described above, and the method for controlling whether to execute demand suppression has been described. By using such a method, the amount of demand can be kept low, and the electricity bill can be kept cheap.

[How to execute demand suppression]
When the demand controller 30 determines to execute demand suppression, actual demand suppression is performed on the load side. Hereinafter, suppression of demand on the power distribution board 40 side and suppression of demand on the lamp distribution board 50 side will be described.

<Detection of relay status by adapter>
In FIG. 1, the adapter device 12 connected to the power storage system 10 on the lamp distribution board 50 side and the external control adapter 44 (external device) on the power distribution board 40 side are relays 33-1 and 33-2, respectively. And the state of the relay 33 is detected. When the relay 33 is a non-voltage contact, the external device can detect whether the relay 33 is in an on state or an off state by applying a voltage to the relay 33 and detecting a current. When the relay 33 is a voltage contact, the external device can detect whether the relay 33 is on or off by detecting the voltage across the relay 33.

<Demand control on the power distribution panel>
When the demand controller 30 determines to execute demand suppression and controls the relay 33-2 connected to the power distribution board 40 side to be turned on, the external control adapter 44 is It detects that relay 33-2 is in an ON state.

  When the external control adapter 44 detects that the relay 33-2 is in the ON state, the external control adapter 44 stops the operation of the outdoor unit 42 of the power load 41 in order to suppress the power consumption of the power load 41. To control. By doing in this way, the demand corresponding to the power consumption of the outdoor unit 42 is suppressed on the power distribution board 40 side. In the present embodiment, the operation of the indoor unit 43 of the power load 41 is continued, and the indoor unit 43 continues to blow air.

<Demand control on the light distribution panel>
When the demand controller 30 determines to execute demand suppression and controls the relay 33-1 connected to the lamp distribution board 50 side to be in an on state, the adapter device 12 connected to the power storage system 10 Detects that the relay 33-1 is in the ON state by the above-described method.

  When the adapter device 12 detects that the relay 33-1 is in the on state, the adapter device 12 discharges the storage battery device 11 to suppress the demand on the lamp distribution board 50 side, and the lamp load 51 or Control is performed so that power is supplied to the specific load 13. By doing in this way, the demand corresponding to the electric power which the storage battery apparatus 11 discharges is suppressed in the lamp distribution board 50 side. A method of controlling the adapter device 12 to cause the storage battery device 11 to discharge will be described later.

  As described above, the method for actually executing the demand suppression on the power distribution board 40 side and the lamp distribution board 50 side when the demand controller 30 determines to execute the demand suppression has been described. By executing demand suppression, the amount of demand can be kept low, and the electricity bill can be kept cheap.

[Discharge instruction from adapter device]
Here, a method for controlling the adapter device 12 to cause the storage battery device 11 to discharge will be described after describing the transition of the operation mode of the storage battery device 11.

<Operation mode transition of storage battery device>
FIG. 4 is a transition diagram of operation modes of the storage battery device 11. Usually, the storage battery device 11 operates to charge cheap midnight power and discharge it during the daytime when the electricity rate is high. Such an operation is performed by presetting a charge / discharge period with a timer. For example, the timer is set to charge from 23:00 to 5 o'clock and to discharge from 12:00 to 16:00. Moreover, you may set to discharge for at least 1 hour. The storage battery device 11 has a plurality of operation modes as operation modes for performing such operations. The plurality of operation modes include, but are not limited to, operation modes A, B, and C. In FIG. 4, the storage battery device 11 may automatically transition between the operation modes A, B, and C so that the operation modes A, B, and C are connected by solid arrows. The transition may be made by a manual operation by an administrator of the facility 1.

  The storage battery device 11 performs charging / discharging according to the charging / discharging period set by the timer as described above when operating in any of the operation modes A, B, and C, but is set as the discharging period by the timer. It is not possible to discharge at an untimed timing. Here, in addition to the operation modes A, B, and C, the operation mode of the storage battery device 11 of the power storage system 10 according to the embodiment includes a forced discharge mode. When the operation mode is changed to the forced discharge mode, the storage battery device 11 is not limited to the period set in advance as the discharge period in the previous operation mode, and forcibly discharges as much as possible. That is, the storage battery device 11 can be discharged at an arbitrary timing by changing the operation mode of the storage battery device 11 to the forced discharge mode.

  The storage battery device 11 transitions the operation mode to the forced discharge mode when the storage battery device 11 acquires a signal for transitioning the operation mode to the forced discharge mode (hereinafter also referred to as a mode transition signal). The mode transition signal may be manually input to the power storage control unit 111 of the storage battery device 11 or may be input from a device such as the adapter device 12.

  FIG. 5 is a flowchart in which the storage battery device 11 transitions the operation mode to the forced discharge mode. First, the power storage control unit 111 of the storage battery device 11 determines whether or not the current operation mode of the storage battery device 11 is the forced discharge mode (step S21). When the current operation mode is not the forced discharge mode (step S21: NO), that is, when the current operation mode is one of the normal operation modes A, B, and C, the power storage control unit 111 proceeds to step S22. When the current operation mode is the forced discharge mode (step S21: YES), the power storage control unit 111 proceeds to step S24.

  In step S22, the power storage control unit 111 determines whether a mode transition signal has been acquired. When the mode transition signal is acquired (step S22: YES), the power storage control unit 111 changes the operation mode from the current normal operation mode to the forced discharge mode (step S23). This transition is indicated by a dashed arrow in FIG. Then, the power storage control unit 111 ends the operation. When the mode transition signal has not been acquired (step S22: NO), the power storage control unit 111 does nothing, that is, ends the operation while the operation mode is the normal mode.

  In step S24, the power storage control unit 111 determines whether a mode transition signal has been acquired. When the mode transition signal has not been acquired (step S24: NO), the power storage control unit 111 changes the operation mode to the operation mode before the transition from the current forced discharge mode to the forced discharge mode (step S25). This transition is indicated by a dashed line arrow in FIG. Alternatively, the storage battery device 11 may change the operation mode to any one of the predetermined operation modes A, B, and C. The mode transition performed in step S25 is also referred to as cancellation of the forced discharge mode. Then, the power storage control unit 111 ends the operation. When the mode transition signal has been acquired (step S24: YES), the power storage control unit 111 does nothing, that is, the operation ends while the operation mode is the forced discharge mode.

  As described above with reference to FIGS. 4 and 5, the storage battery device 11 can be discharged at an arbitrary timing by changing the operation mode to the forced discharge mode. By doing in this way, it becomes possible to make the storage battery apparatus 11 discharge according to the timing which the demand controller 30 decided to perform demand suppression.

<Mode transition signal from adapter device>
As described above, the storage battery device 11 of the power storage system 10 can acquire the mode transition signal from the adapter device 12 connected to the power storage system 10. That is, the adapter device 12 can be controlled to cause the storage battery device 11 to discharge by generating a mode transition signal and transmitting it to the storage battery device 11.

  FIG. 6 is a flowchart illustrating an operation in which the adapter device 12 generates a mode transition signal. First, the adapter control unit 121 of the adapter device 12 detects whether the relay 33-1 is in an on state or an off state by the above-described method (step S31).

  Subsequently, the adapter control unit 121 determines whether or not the relay 33-1 is in an on state (step S32). When relay 33-1 is off (not on) (step S32: NO), adapter controller 121 does not generate a mode transition signal (step S33), and then ends the operation. When relay 33-1 is in the on state (step S32: YES), adapter control unit 121 generates a mode transition signal (step S34), and then ends the operation.

  The adapter control unit 121 repeats the operation of the flowchart of FIG. 6, continues the state of generating the mode transition signal while the relay 33-1 is in the on state, and while the relay 33-1 is in the off state. The state where no mode transition signal is generated is continued. By doing in this way, the state of the relay 33-1 and the state of whether the mode transition signal is generated can be matched. And the storage battery apparatus 11 can change an operation mode according to the state of the relay 33-1 by acquiring a mode transition signal. As a result, the storage battery device 11 can discharge in accordance with the timing determined by the demand controller 30 to execute demand suppression, and can suppress demand on the lamp distribution board 50 side.

  5 and 6, the adapter control unit 121 of the adapter device 12 always generates a mode transition signal corresponding to the state of the relay 33-1. However, the control method is not limited to this. For example, the adapter control unit 121 detects a change in the state of the relay 33-1, and when the relay 33-1 changes from an off state to an on state, the adapter control unit 121 outputs a first pulse signal that instructs the transition to the forced discharge mode. It may be generated as a mode transition signal. Conversely, when the relay 33-1 changes from the on state to the off state, the adapter control unit 121 may generate a second pulse signal instructing cancellation of the forced discharge mode as a mode transition signal. In such an example, the power storage control unit 111 of the storage battery device 11 determines whether or not the first pulse signal is acquired in step S22 of FIG. 5, and determines whether or not the second pulse signal is acquired in step S24.

  In the above, it has been described that the adapter device 12 performs control to cause the storage battery device 11 to discharge. By doing in this way, although the storage battery apparatus 11 does not have the function to detect directly the state corresponding to whether or not to execute demand suppression, at the timing when the demand controller 30 determines to execute demand suppression. It can discharge together.

[Merit of power storage system according to this embodiment]
The power storage system 10 according to the present embodiment includes a storage battery device 11 that cannot detect the state output by the demand controller 30 using the relay 33, and an adapter that detects the state and generates a mode transition signal that can be acquired by the storage battery device 11. The apparatus 12 is provided. The power storage system 10 having such a configuration can be realized only by adding the adapter device 12 to a general-type storage battery device 11 that is often installed in existing facilities. Therefore, the structure which makes the storage battery apparatus 11 discharge according to the timing which the demand controller 30 determined to perform demand suppression, without replacing | exchanging the storage battery apparatus 11 is realizable. That is, an investment for replacing the storage battery device 11 is not required, and the configuration is economical.

<Comparative example>
As a comparative example that does not use the adapter device 12, a three-phase storage battery device that charges and discharges three-phase power that can be connected to the power distribution board 40 side will be described. The three-phase storage battery device can detect the state of the relay 33 when connected to the relay 33. When the relay 33 is in the on state, that is, when the demand controller 30 has decided to execute demand suppression, the three-phase storage battery device is discharged to execute demand suppression on the power distribution board 40 side. Can do. However, since the three-phase storage battery device is connected to the power distribution board 40 side, the three-phase storage battery device is a device having a large storage capacity and high expertise (not general purpose). Although this has the merit that the demand on the power distribution board 40 occupying a large proportion in the demand of the entire customer facility 1 can be suppressed, there is a demerit that a lot of investment for installation is required. Usually, the investment related to the installation of the three-phase storage battery device is much larger than the investment related to the installation of the storage battery device 11 that charges and discharges the single-phase power according to this embodiment, and it takes time to recover the investment. Therefore, it can be installed only in a limited customer facility 1.

  On the other hand, as described above, the power storage system 10 according to the present embodiment can cause the storage battery device 11 to execute discharge corresponding to demand suppression only by adding the adapter device 12 to the general-purpose storage battery device 11. It is an economical structure. If the general-purpose storage battery device 11 is already installed, it can be used as it is, and only the cost for installing the adapter device 12 can be used. According to the power storage system 10 according to the present embodiment, for example, it is possible to reduce the amount of electricity bills collected in a year, and the investment for adding the adapter device 12 can be easily recovered.

[Modification 1]
As a first modification of the present embodiment, a case will be described in which priority is determined according to the connection destination of the relay 33 when the state of the relay 33 is controlled in response to the demand controller 30 performing demand suppression.

  FIG. 7 is a schematic diagram illustrating a connection between the demand controller 30 and a load according to the first modification. In FIG. 7, the power load 41 connected to the power distribution board 40 includes a plurality of outdoor units 42-1 to 42-n (hereinafter collectively referred to as outdoor units 42). In addition, relays 33-2-1 to n are connected to the outdoor units 42-1 to n through external control adapters 44-1 to 44-n. Moreover, in FIG. 7, the relay 33-1 is connected to the adapter apparatus 12 connected to the electrical storage system 10 connected to the lamp distribution board 50 side.

  When the demand controller 31 of the demand controller 30 determines to execute demand suppression according to the flowchart of FIG. 2, the demand controller 30 turns on the relay 33. Here, the demand control unit 31 may turn on all of the relays 33 (in FIG. 7, relays 33-1 and 33-2-1 to n).

  In addition, the demand control unit 31 can assign priorities to each of the relays 33 so that the relays are turned on in order from the highest priority. Such a control method is also called demand control. In this case, preferably, the relay 33-1 connected to the adapter device 12 connected to the power storage system 10 has a priority of the relays 33-2-1 to 33-2-1 to n connected to the outdoor unit 42 included in the power load 41. Higher than the priority. By doing in this way, while maintaining the operation rate of the power load 41, it is possible to suppress the demand on the side of the lamp distribution board 50 by causing the storage battery device 11 of the power storage system 10 to discharge, thereby reducing the maximum demand. In addition, the priority order of relays 33-2-1 to n may be appropriately determined according to the configuration such as the ratings of the outdoor units 42-1 to n to be connected.

  The priority order of the relays 33 can also be regarded as the priority order given to the counterpart device that is connected to each relay 33 and detects the state of each relay 33, for example, the adapter device 12 or the outdoor unit 42. That is, when the priority of the relay 33-1 is higher than the priority of the relay 33-2, the priority assigned to the adapter device 12 is higher than the priority assigned to the outdoor unit 42 included in the power load 41. high.

  In addition, the demand control unit 31 may turn on each relay 33 by a wheel number. Such a control method is also called intermittent operation. By doing in this way, the apparatus which contributes to suppression of a demand can be disperse | distributed.

[Modification 2]
As modification 2 of this embodiment, the charge / discharge timing of the storage battery device 11 will be described. As described above, when operating in the normal operation mode, the storage battery device 11 performs charging during a charging period preset by a timer, and performs discharging during a discharging period preset by the timer. The power storage control unit 111 of the storage battery device 11 according to the modified example 2 is controlled so as to continue charging as much as possible during the non-discharge period in preparation for the transition to the unexpected forced discharge mode, and the charge amount as much as possible Is kept large (charge rate is high). In this way, even if it is decided to execute demand suppression twice, three times, or more during the day, the remaining discharge capacity is maintained to cope with these demand suppressions. be able to.

[Modification 3]
As modification 3 of this embodiment, the structure in which the storage battery apparatus 11 contains the adapter apparatus 12 is demonstrated. The storage battery device 11 according to Modification 3 includes an adapter control unit 121 in addition to the power storage control unit 111. In this case, the storage battery device 11 can transition to the forced discharge mode in response to the adapter controller 121 detecting the state of the relay 33-1. By setting it as such a structure, it can be set as a more compact structure than the structure which adds the adapter apparatus 12 outside.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component, each step, etc. can be rearranged so that there is no logical contradiction, and multiple components, steps, etc. can be combined or divided into one It is. Further, although the present invention has been described centering on an apparatus, the present invention can also be realized as a method including steps executed by each component of the apparatus. Further, although the present invention has been described mainly with respect to the apparatus, the present invention can also be realized as a method, a program executed by a processor included in the apparatus, or a storage medium storing the program, and is within the scope of the present invention. It should be understood that these are also included.

DESCRIPTION OF SYMBOLS 1 Customer facility 10 Power storage system 11 Storage battery device 12 Adapter device 13 Specific load 20 High voltage power receiving device (power receiving facility)
DESCRIPTION OF SYMBOLS 21 Electric power meter 22 Electric power sensor 23 Transformer 30 Demand controller 33-1, 33-2 Relay 34 Display apparatus 40 Power distribution board 41 Power load (three-phase load)
44 External control adapter 50 Electric distribution board 51 Electric load (single-phase load)

Claims (8)

A power receiving facility that supplies power from the grid to a single-phase load and a three-phase load; and a demand controller that outputs a state corresponding to whether to perform demand suppression according to the amount of received power acquired from the power receiving facility; A power storage system connected to
A storage battery device for supplying charged power to the single-phase load;
An electricity storage system comprising: an adapter device that detects a state output from the demand controller and generates a mode transition signal that can be acquired by the storage battery device in accordance with the state output from the demand controller.   The storage battery device has a plurality of operation modes including a forced discharge mode for forcibly discharging, and transitions to the forced discharge mode based on the mode transition signal acquired from the adapter device. Power storage system. When the adapter device determines that the state output from the demand controller is a state corresponding to executing demand suppression, the adapter device generates the mode transition signal,
The power storage system according to claim 2, wherein the storage battery device transitions to the forced discharge mode when the mode transition signal is acquired. When the adapter device determines that the state output from the demand controller is a state corresponding to not performing demand suppression, the adapter device does not generate the mode transition signal,
The power storage system according to claim 3, wherein the storage battery device cancels the transition to the forced discharge mode when the mode transition signal is not acquired. According to the priority given to the device configured to detect the state output from the demand controller, a state corresponding to executing demand suppression from the demand controller is output to the device,
The power storage system according to any one of claims 1 to 4, wherein a priority assigned to the storage battery device is higher than a priority assigned to a device included in the three-phase load. A demand controller that outputs a state corresponding to whether or not demand suppression is performed according to the amount of received power acquired from the power receiving equipment that supplies power from the grid to the single-phase load and the three-phase load, and the charged power Connected to the storage battery device that supplies the single-phase load,
An adapter device that detects a state output from the demand controller and generates a mode transition signal that can be acquired by the storage battery device in accordance with the state output from the demand controller. A power receiving facility that supplies power from the grid to a single-phase load and a three-phase load; and a demand controller that outputs a state corresponding to whether to perform demand suppression according to the amount of received power acquired from the power receiving facility; Connected to
Supply the charged power to the single-phase load,
A storage battery device for detecting a state output from the demand controller. A power receiving facility that supplies power from the grid to a single-phase load and a three-phase load; and a demand controller that outputs a state corresponding to whether to perform demand suppression according to the amount of received power acquired from the power receiving facility; Is a storage system control method comprising a storage battery device connected to the single-phase load to supply the charged power,
Detecting a state output from the demand controller;
Generating a mode transition signal that can be acquired by the storage battery device in accordance with a state output from the demand controller.

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