Energy management system

Abstract

To provide an energy management system for easily performing control of charge / discharge of a storage battery.SOLUTION: An energy management system for controlling the charge and / or the discharge of the power storage system comprises: detection means for detecting power consumption in a private system; storage means for storing history of the power consumption; discharge command signal transmission means for commanding the power storage system to perform discharge when the power consumption detected by the detection means exceeds a first value; and charge command signal transmission means for commanding the storage system to perform charge when the power consumption detected by the detection means falls below a second value. The energy management system displays a discharge line and a charge line corresponding to the first and second values, displays the power consumption or the history of the power consumption stored in the storage means, and causes a user to determine the displayed discharge line and charge line when the first and second values are set.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to an energy management system for issuing discharge and charge commands to a storage battery. [Background technology]

[0002] In addition to the fact that electricity consumption continues to increase year by year, the prices of energy resources are also steadily rising. As a result, the electricity bill costs are becoming a heavy burden for each electricity consumer.

[0003] Here, a method for calculating electricity charges when a demand-based pricing system is adopted will be described. A maximum demand wattmeter (demand meter) is installed in the facility of the power recipient. The demand meter measures the power consumption (kW) for a predetermined period (e.g., 30 minutes) and calculates the average power usage (kW) for the predetermined period. Generally, when the demand value is mentioned, it means the instantaneous power value (kW), but when the demand value is mentioned in calculating the electricity bill, it may mean the average power usage (kW) for the predetermined period, so in this specification, the two terms will be distinguished.

[0004] That is, in this specification, in order to distinguish between the two, when we say demand value (kW), we mean the instantaneous power value (kW), and when we say a specified period demand value (kW), we mean the average power usage (kW) for the specified period, and we will use the terms accordingly.

[0005] The demand meter stores the maximum demand value (kW) for a predetermined period during a measurement period (for example, one month). In this specification, the maximum demand value (kW) for a predetermined period during a measurement period is referred to as the maximum demand value (kW).

[0006] When a demand-based pricing system is adopted, the electricity bill of an electricity recipient is calculated as the sum of a basic charge and a metered charge.

[0007] The basic charge is calculated based on the largest maximum demand value among the maximum demand values ​​for each month in the past 12 months. Therefore, if the maximum demand value becomes large even once in the past 12 months, the basic charge will be applied based on that maximum demand value. In this specification, this largest maximum demand value is referred to as the contract demand value (kW).

[0008] In this specification, the demand value (kW), the specified period demand value (kW), the maximum demand value (kW), and the contract demand value (kW) are collectively referred to as "demand," the cases where the demand value (kW), the specified period demand value (kW), the maximum demand value (kW), and the contract demand value (kW) are small are collectively referred to as "small demand," and lowering the demand value (kW), the specified period demand value (kW), the maximum demand value (kW), and the contract demand value (kW) may be collectively referred to as "reducing the demand," etc.

[0009] Of course, the method of calculating electricity charges varies depending on the power provider, but when a demand-based pricing system is adopted, the largest maximum demand value (=contract demand value) is determined. In most cases, the higher the contract demand value, the higher the basic charge or metered charge.

[0010] Therefore, if the contract demand value is reduced, the electricity bill can be reduced. In order to reduce the contract demand value, it is necessary to reduce the monthly maximum demand value, and in order to reduce the monthly maximum demand value, it is necessary to reduce the demand value for a specified period or the demand value.

[0011] Based on this premise, there have been conventional systems that monitor electricity usage, monitor demand values ​​for a specified period, and issue an alarm if a target demand value for a specified period is exceeded, such as the demand monitoring system in Non-Patent Document 1. When an alarm is issued from the demand monitoring system, the power recipient manually refrains from using the load, so as to prevent the demand value from increasing for the specified period. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent No. 6393361 [Patent Document 2] Patent No. 6453744 [Patent Document 3] Patent No. 6249022 [Patent Document 4] JP 2019-118238 A [Non-patent literature]

[0013] [Non-Patent Document 1] Kansai Electrical Safety Association, "Demand Monitoring System", searched on May 16, 2023, Internet,<https: / / www.ksdh.or.jp / service / security / demand.html> Summary of the Invention [Problem to be solved by the invention]

[0014] When using the demand monitoring system described in Non-Patent Document 1, the user saves power by reducing the usage load, using devices that consume less power, etc. However, there is a limit to the reduction in the demand value for a specific period or the demand value by saving power alone.

[0015] An effective solution is to install a storage battery, charge it during times when demand is low or electricity rates are low, and discharge it during times when demand is high. This will reduce the demand, and therefore the maximum demand value.

[0016] There are many prior art technologies for controlling the charging and discharging of storage batteries, such as those described in Patent Documents 1 to 4. However, unless the charging and discharging of the storage battery value is controlled correctly, it is not possible to fully utilize the expensive storage battery. However, it is difficult to set the charging and discharging control of the storage battery in actual operation. This is because the tendency of power consumption varies widely depending on the power supplier and consumer, and is also affected by weather conditions such as extreme heat or extreme cold.

[0017] Many of the prior art technologies for battery control use various parameters, which are numerical information, to control the battery, but these parameters must be set correctly. However, since most of the people in charge of operating the battery control are not specialists but are in charge of the facilities department, it is difficult for them to determine the values ​​of these parameters, and in many cases the system is not able to perform to its full potential.

[0018] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide an energy management system that enables easy control of charging and discharging of a storage battery.

[0019] Another object of the present invention is to provide an energy management system that enables easy control of charging and discharging of a storage battery using a GUI (Graphical User Interface).

[0020] Another object of the present invention is to provide an energy management system that makes it possible to reduce the maximum demand value and reduce electricity costs.

[0021] Regarding the above problem, Patent Documents 1 to 4 will be compared. In Patent Document 1, claim 5 states that the charge / discharge control unit can be manually set using an operation unit that can be set by a user interface, and Fig. 2 and Fig. 3 show examples of GUI for setting the battery charge / discharge control. However, Patent Document 1 does not describe setting the charge / discharge line on a graph while looking at the graph.

[0022] In Patent Document 2, claim 1 states that a means for displaying an operation plan related to peak cutting is provided. Also, paragraphs 0090 and 0107 of the specification of Patent Document 2 state that the current settings can be input while visually checking the operation plan display section. Also, FIG. 7 shows a screen where the demand suppression amount and order can be set, but only numerical information. Thus, in Patent Document 2, the setting information is related to the operation of the facility equipment that serves as a load, and not the discharge line or charge line.

[0023] Patent Document 3 claims that the device has a display that displays storage battery information and an operation unit that allows input of charge / discharge requests. Figure 4 of Patent Document 3 shows an example of a GUI for setting storage battery charge / discharge control, but it is for input of numerical information, and does not allow the user to set a discharge line or a charge line while viewing the actual power consumption transition on a graph.

[0024] In Patent Document 4, a reception unit that receives operations by a user is claimed. In Fig. 6 of Patent Document 4, an example of a GUI for setting battery charge / discharge control is described, but it is for inputting numerical information, and it is not possible to set a discharge line or a charge line while viewing the actual power consumption transition in a graph. [Means for solving the problem]

[0025] In order to solve the above problems, the present invention has the following features: The present invention is an energy management system for controlling charging and / or discharging of the power storage system, comprising a detection means for detecting power consumption or the amount of power consumption for a predetermined period in an on-premise system having at least a load and a power storage system, and a storage means for storing a history of the power consumption or the amount of power consumption, and further comprising at least one of a discharge command signal sending means for instructing the power storage system to discharge when the power consumption or the amount of power consumption detected by the detection means exceeds a first value, and a charge command signal sending means for instructing the power storage system to charge when the power consumption or the amount of power consumption detected by the detection means falls below a second value. When setting the first and / or second values, the energy management system displays a discharge line and / or a charge line corresponding to the first and / or second values, and displays the power consumption or history of power consumption stored in a memory means, determines the first and / or second values ​​by having a user determine the displayed discharge line and / or charge line, and starts controlling the charging and / or discharging of the storage system by a discharge command signal sending means and / or a charge command signal sending means based on the determined first and / or second values.

[0026] Preferably, the energy management system includes a remaining charge depicting means for depicting a change or a tendency of change in the remaining charge of the power storage system when the discharge line and / or the charge line input by the user is used.

[0027] Preferably, the energy management system includes a power reception depicting means for depicting a change or a tendency of change in the received power or the amount of received power when the discharging line and / or the charging line input by the user is used.

[0028] Preferably, the energy management system comprises a consumption depicting means for depicting the change or tendency of change in the power consumption or amount of power consumption when the discharging line and / or charging line input by the user is used.

[0029] Preferably, when the energy management system determines that the power consumption or amount of power consumption will exceed a first value when using the discharge line and / or charge line entered by the user, it displays a display instructing the user to increase the discharge line.

[0030] Preferably, when the energy management system determines that the power consumption or amount of power consumption will exceed the first value when using the discharge line and / or charge line input by the user, it displays a display instructing the user to increase the charge line.

[0031] Preferably, when the energy management system determines that the remaining charge will reach a predetermined lower limit using the discharge line and / or charge line input by the user, it displays a message instructing the user to raise the discharge line.

[0032] Preferably, when the energy management system determines that the remaining charge will reach a predetermined lower limit using the discharge line and / or charge line input by the user, it displays a message instructing the user to raise the charge line.

[0033] Preferably, when the energy management system determines that the remaining charge will be equal to or greater than a predetermined value when using the discharge line and / or charge line input by the user, it displays a message instructing the user to lower the discharge line.

[0034] Preferably, when the energy management system determines that the remaining charge will be equal to or greater than a predetermined value when using the discharge line and / or charge line input by the user, it displays a message instructing the user to lower the charge line.

[0035] Preferably, the energy management system further comprises a line input means for allowing a user to input a discharge line and / or a charge line, and when setting the first and / or second value, the discharge line and / or the charge line input by the line input means is displayed.

[0036] Preferably, the energy management system further includes an automatic calculation means for automatically calculating the discharge line and / or the charge line, and when setting the first and / or second value, the discharge line and / or the charge line calculated by the automatic calculation means is displayed.

[0037] Preferably, the automatic calculation means calculates the discharge line and / or the charge line by artificial intelligence.

[0038] Preferably, the discharge line and / or the charge line calculated by the automatic calculation means can be changed by a user.

[0039] Preferably, the automatic calculation means determines a charge line so that the charge capacity [kWh] based on the charge line corresponds to the storable capacity [kWh] of the storage system, and determines a discharge line so that the discharge capacity [kWh] based on the discharge line corresponds to the charge capacity [kWh].

[0040] Preferably, the charge line and / or the discharge line can be moved up or down by the user on a graphical user interface.

[0041] Preferably, the detection means detects the power consumption or the amount of power consumption based on the received power or the amount of received power, the charged power or the amount of charged power, and the discharged power or the amount of discharged power of the local system.

[0042] Preferably, when the on-site system is equipped with a power generation system, the detection means detects the power consumption or amount of power consumption based on the received power or amount of power generated by the on-site system, the charging power or amount of charging power, the discharging power or amount of discharging power, and the generated power or amount of power generated. Effect of the Invention

[0043] According to the present invention, it is possible to control the charging and discharging of a storage battery system using a discharge line and / or a charge line, thereby providing an energy management system that makes it easy to control the charging and discharging of the storage battery.

[0044] In addition, the discharge line and / or charge line are displayed, and the power consumption or power consumption history stored in the memory means is displayed, allowing the user to select the displayed discharge line and / or charge line, thereby providing an energy management system that enables easy control of charging and discharging of the storage battery using a GUI (graphical user interface).

[0045] Furthermore, by setting a discharge line and performing discharge control using the first value, the maximum demand value can be reduced, thereby providing an energy management system that makes it possible to reduce electricity bill costs.

[0046] By displaying the remaining charge predicted by the remaining charge predicting means, the discharge line and / or the charge line can be determined in a visually easy-to-understand manner.

[0047] By displaying the prediction of the received power or the amount of received power by the power reception prediction means, the discharge line and / or the charge line can be determined in a visually easy-to-understand manner.

[0048] By displaying the power consumption or the predicted amount of power consumption by the consumption prediction means, the discharge line and / or the charge line can be determined in a visually easy-to-understand manner.

[0049] Depending on the conditions, an instruction to raise or lower the discharge line and / or the charge line is displayed, so that the discharge line and / or the charge line can be determined in a visually easy-to-understand manner.

[0050] By using the line input means, the user can easily input the discharge line and / or the charge line.

[0051] By displaying the discharge line and / or the charge line calculated by the automatic calculation means, it becomes easier for the user to determine the discharge line and / or the charge line.

[0052] If an automatic calculation means is implemented using artificial intelligence, it will be easier to determine the preferred discharge and / or charge lines.

[0053] If the discharge line and / or the charge line calculated by the automatic calculation means can be changed by the user, it becomes possible to adjust the charge / discharge control according to the circumstances.

[0054] The automatic calculation means determines a charge line so that the charge capacity [kWh] based on the charge line corresponds to the storage capacity [kWh] of the energy storage system, and determines a discharge line so that the discharge capacity [kWh] based on the discharge line corresponds to the charge capacity [kWh], making it possible to identify candidates for the discharge line and / or the charge line with simple calculations.

[0055] By detecting the power consumption or amount of power consumption based on the on-site system's received power or amount of received power, charging power or amount of charging power, and discharging power or amount of discharging power, or based on the generated power or amount of generated power if the on-site system has a power generation system, it becomes unnecessary to directly measure the power consumption or amount of power consumption of the load, enabling efficient control.

[0056] These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0057] [Figure 1] FIG. 1 is a block diagram showing the overall configuration of an energy management system (hereinafter referred to as "EMS") 1 and an on-premise system 13 (hereinafter referred to as "system 13") including the EMS 1 according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a flowchart showing an example of the operation of the control unit 7 when setting the discharge line and the charge line (in the case of manual setting). [Diagram 3] FIG. 3 is a flowchart showing the subsequent operation of FIG. [Figure 4] FIG. 4 is a flowchart showing an example of the operation of the control unit 7 when setting the discharge line and the charge line (when the automatic setting function is present). [Diagram 5] FIG. 5 is a flowchart showing an example of the operation of the control unit 7 in the automatic calculation process of the discharge line and the charge line in FIG. [Figure 6] FIG. 6 is a flowchart showing an example of the operation of the control unit 7 when setting the discharge line and the charge line (when the optimal line setting function using artificial intelligence is present). [Figure 7A] FIG. 7A is a flowchart showing an example of the operation of the control unit 7 (control at instantaneous values) during operation after the discharge line and the charge line are set. [Figure 7B] FIG. 7B is a flowchart showing an example of the operation of the control unit 7 during operation after the discharge line and the charge line are set (control at a 30-minute power amount value). [Figure 8] FIG. 8 is a diagram for explaining an outline of the present invention. [Figure 9] FIG. 9 is a diagram showing a history of power consumption before the start of control. [Figure 10] FIG. 10 is a diagram for explaining that the maximum demand value can be reduced by charging and discharging. [Figure 11] FIG. 11 is a diagram showing an example of a GUI showing a charge line and a discharge line. [Figure 12]FIG. 12 is a diagram showing an example of a GUI that shows the state of charge (hereinafter referred to as "SOC") in addition to the charge line and discharge line. [Figure 13] FIG. 13 is a diagram showing an example of setting the charge line and the discharge line when the SOC is depleted, and is an example of a GUI for displaying an instruction to raise the discharge line. [Figure 14] FIG. 14 is a diagram showing an example of a GUI in which the discharge line can be raised so as to prevent the SOC from being depleted. [Figure 15] FIG. 15 is a diagram showing an example of setting the charge line and the discharge line when the SOC is depleted, and is an example of a GUI for displaying an instruction to raise the charge line. [Figure 16] FIG. 16 is a diagram showing an example of a GUI in which the charging line can be increased to prevent the SOC from running out. [Figure 17] FIG. 17 is a diagram showing an example of a GUI in which power consumption is represented by the amount of power consumption for a predetermined period of time. [Figure 18A] FIG. 18A is a diagram showing an example of a GUI for explaining an outline of the automatic calculation process of the discharge line and the charge line. [Figure 18B] FIG. 18B is a diagram showing an example of a GUI for explaining an outline of the automatic calculation process of the discharge line and the charge line. [Figure 19A] FIG. 19A is a diagram for explaining an operational flow for calculating and depicting changes or trends in changes in SOC, received power, and power consumption in a situation where the power consumption history falls below the charging line. [Figure 19B] FIG. 19B is a diagram for explaining an operational flow for calculating and depicting changes or trends in changes in the SOC, received power, and power consumption in a situation where the history of power consumption exceeds the discharge line. [Figure 19C] FIG. 19C is a diagram showing an example of an operational flow of a process of calculating and depicting changes or trends in changes in the SOC, received power, and power consumption. [Figure 19D]FIG. 19D is a diagram showing an example of an operational flow of a process for calculating and depicting changes or trends in changes in SOC, received power, and power consumption. [Figure 19E] FIG. 19E is a diagram showing an example of an operational flow of a process of calculating and depicting changes or trends in changes in SOC, received power, and power consumption. [Figure 19F] FIG. 19F is a diagram showing an example of an operational flow of a process of calculating and depicting changes or trends in changes in SOC, received power, and power consumption. [Figure 20] FIG. 20 is a diagram for explaining an example in which charging is performed until the SOC reaches a set value, within a range not reaching the discharge line. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0058] In FIG. 1, a system 13 includes an EMS 1, a power storage system 2, a power generation system 3, one or more loads 4, and a power receiving and transforming facility 5. In addition, in the case of home use or receiving low voltage power, the substation equipment 5 is not necessary. In FIG. 1, it is assumed that the power generated by the power generation system 3 is supplied to a load, used for charging, or used as a reverse power flow to the grid, or conversely, reverse power flow is prohibited for self-consumption. However, the power generation system 3 is not a required component of the present invention.

[0059] High voltage power is supplied from an electric power system 6 outside the premises to a substation facility 5. The substation facility 5 transforms the voltage to match the loads 4 within the premises and supplies the power to the premises. The power generation system 3 is a power generation system using renewable energy or a private power generation device. The power generated by the power generation system 3 is also supplied to the premises. The power storage system 2 charges and discharges the power supplied from the power receiving and transforming equipment 5 and the power generation system 3. The charging and discharging of the power storage system 2 is controlled by a charge / discharge control signal from the EMS 1.

[0060] The EMS 1 can detect received power by measuring the power supplied from the power receiving and transforming equipment 5 or the grid 6. The EMS 1 can detect the charging power and discharging power by the power storage system 2 by the charge / discharge control signal. The EMS 1 can also detect the power generated by the power generation system 3. In this way, the EMS 1 has the function of detecting received power, charging power, discharging power, and generated power.

[0061] The EMS 1 can detect the power consumption of the load 4 based on the received power, the charged power, the discharged power, and the generated power. That is, the EMS 1 can detect the power consumption by calculating Power Consumption=Received Power+Discharged Power-Charged Power+Generated Power. In addition, the EMS 1 can detect the state of charge (SOC) of the power storage system 2.

[0062] Since each detection method using EMS1 is a well-known technique, detailed explanation will be omitted and any well-known method will be used.

[0063] The present invention can also be applied to the control of the power generation system 3 (for example, selling electricity, wheeling, self-consumption, etc.), in which case the EMS1 (or other control device) transmits a power generation control signal to the power generation system 3, and such a configuration is not excluded from the present invention.

[0064] When the received power becomes 0 or less, this means that the generated power output from the power generation system 3 is greater than the power consumed by the load 4, so the EMS 1 transmits a signal to the power storage system 2 to charge. With this operation, the power generated by the power generation system 3 is diverted for charging. Since the method of charging surplus power by the power generation system 3 is a well-known technique, a detailed description will be omitted. In the present invention, a configuration related to charging surplus power by the power generation system 3 is not excluded.

[0065] Furthermore, when the power generation system 3 satisfies a predetermined condition (for example, when the generated power is equal to or exceeds a set value), the EMS 1 may transmit a signal to the power storage system 2 with priority to store power. This enables effective use of natural energy.

[0066] Here, the difference between power and energy of power will be clarified. Power is instantaneous power, and its unit is [kW]. Energy of power is the total amount (integral) of power over a given period, and its unit is [kWh]. In the following explanation, explanation will be given using power consumption [kW]. That is, explanation will be given based on whether power consumption [kW] is above a first value [kW] corresponding to a discharge line or below a second value [kW] corresponding to a power receiving line.

[0067] However, it is also possible to understand power consumption [kW] in terms of the amount of power [kWh] in a predetermined period of time. In that case, in the following description, power consumption [kW] can be read as the amount of power consumption [kWh] and whether the amount of power consumption [kWh] is higher than a first value [kWh] corresponding to a discharge line or lower than a second value [kWh] corresponding to a power receiving line, and the present invention can be understood accordingly. Note that a GUI in the case where the amount of power consumption [kWh] is used is illustrated in FIG. 17. Supplementary explanations will be provided for the case where the amount of power consumption [kWh] is used as appropriate and necessary.

[0068] The EMS 1 includes a control unit 7, an input unit 8, an output unit 9, a storage unit 10, an operation unit 11, and a display unit 12. The control unit 7 controls the operation of the EMS 1 by executing a program stored in the storage unit 10. The storage unit 10 stores information necessary for controlling the EMS 1, such as history information on power consumption, received power, SOC, etc., and information on the charging line and discharging line (first value and second value). When control is performed using the power consumption [kWh], the storage unit 10 stores the history of the power consumption.

[0069] The input unit 8 is a device for inputting information from an external device or system, such as signals related to received power and supplied power. The output unit 9 is a device for transmitting a charge / discharge signal to the power storage system 2, a power generation control signal to the power generation system 3, and the like. The operation unit 11 is a general input device such as a touch panel, a keyboard, or a mouse. The display unit 12 is a general output device such as a display.

[0070] Using the above-described configuration, charging and discharging of the electricity storage system 2 is controlled. An outline of a method for controlling charging and discharging of the storage battery system 2 will be described with reference to FIG.

[0071] In Fig. 8, the left vertical axis represents power [kW], the right vertical axis represents SOC [%], and the horizontal axis represents time [t]. At a set time point in Fig. 8, the control unit 7 displays the past power consumption on the display unit 12. The user checks the past power consumption displayed on the display unit 12 and determines the discharge line and the charge line. The discharge line and the charge line input by the user are also displayed on the display unit 12 by the control unit. The control unit 7 provides an easy-to-understand GUI so that the user can input the discharge line and the charge line while viewing the past power consumption.

[0072] Information regarding the discharge line and the charge line determined using the GUI is stored in the memory unit 10, and the setting is completed. The first value corresponds to the discharge line, and the second value corresponds to the charge line. After the setting is completed, the EMS 1 starts controlling the charge and discharge. After control starts, when the power consumption exceeds a first value, the control unit 7 transmits a discharge command signal to the power storage system 2 (discharge command signal sending means), and when the power consumption falls below a second value, transmits a charge command signal to the power storage system 2 (charge command signal sending means).

[0073] The charging command signal includes information on how many kilowatts [kW] to charge. Or, the charging command signal includes information on how many kilowatt hours [kWh] to charge within a predetermined period. Or, the charging command signal simply includes information on simply charging without a value. The power generation system 3 discharges the power specified by the charge command signal. Alternatively, the power generation system 3 charges the amount of power specified by the charge command signal within a predetermined period. Alternatively, the power generation system 3 starts charging in accordance with the charge command signal.

[0074] The discharge command signal includes information on how many kilowatts [kW] to discharge. Alternatively, the discharge command signal includes information on how many kilowatt hours [kWh] to discharge within a predetermined period of time. Alternatively, the discharge command signal simply includes information on discharging without a value. The power generation system 3 discharges the power specified by the discharge command signal. Alternatively, the power generation system 3 discharges the amount of power specified by the discharge command signal within a predetermined period. Alternatively, the power generation system 3 starts discharging in accordance with the discharge command signal.

[0075] After control starts, the control unit 7 displays the current power consumption, received power, discharge line, charge line, and SOC on the display unit 12 in response to a request from the user or constantly, or at other appropriate timing. In the example of Fig. 8, after control starts, the power consumption decreases, and when it falls below the charge line, a charge command signal is transmitted from the control unit 7 to the power storage system 2. Thereafter, while the power consumption is still below the charge line, charging is performed by the power storage system 2. Therefore, the SOC increases. In Fig. 8, the received power is indicated by a thick line, and the consumed power is indicated by a thick or dashed line (similar below).

[0076] When the amount of received power or the amount of consumed power is used, the changes may be shown by a bar graph.

[0077] Although not shown in FIG. 8, when the battery is fully charged, it is no longer possible to charge the battery any more, and the received power required for charging is no longer necessary, so that the received power drops to the consumed power.

[0078] In the following explanation including Fig. 8, the power obtained by inverting the curve of the power consumption during charging is regarded as the power for storage. That is, the control unit 7 sends out a charge command signal including information on the power [kW] that is the difference between the charging line and the power consumption (or the amount of power [kWh] when using a predetermined period, the same applies below).

[0079] However, the charge command signal may include information commanding charging of a predetermined power [kW] (or a predetermined amount of power [kWh], the same applies below). In addition, when a storage battery that only accepts a command to charge is used, the charge command signal contains only information to command charging. In this case, the storage battery charges until it is fully charged (or reaches a predetermined charging state) or until an instruction to stop charging is given.

[0080] In addition, if the charging command signal causes the received power to exceed the discharge line, a discharge command signal must be sent. Therefore, it is preferable to set the value of power [kW] included in the charging command signal so that the received power does not exceed the discharge line.

[0081] When the SOC reaches 100%, the power storage system 2 cannot charge any more and therefore automatically stops charging. Alternatively, the control unit 7 sends a charging stop signal to stop charging by the power storage system 2.

[0082] When the power consumption increases and exceeds the charging line (second value), the control unit 7 transmits a charging stop signal to the power storage system 2. In response to this, charging is stopped, and the SOC is maintained at the same value.

[0083] When the power consumption continues to increase and reaches or exceeds the discharge line (first value), the control unit 7 transmits a discharge command signal. In response to this, the power storage system 2 starts discharging. As shown in Fig. 8, when discharging starts, the SOC decreases. Since the power consumption is partly covered by the discharged power, the received power remains at a constant value.

[0084] A discharge command signal is sent to instruct the power storage system 2 to discharge as much as possible so that the power shortage can be fully met by the power storage system 2. Alternatively, the value of the power difference [kW] between the power consumption and the discharge line is included in the discharge command signal as the discharge power, and is sent to the power storage system 2. Alternatively, the amount of power to be discharged [kWh] is included in a discharge command signal and sent to the power storage system 2. Alternatively, in the case of a storage battery that simply accepts a command to discharge, the power storage system 2 will discharge until it is empty or until an instruction to stop discharging is given.

[0085] Although not shown in FIG. 8, when the SOC is depleted, no more discharge is possible, and the received power increases to the consumed power.

[0086] With reference to Fig. 9 and Fig. 10, the reason why the maximum demand value decreases by storing and discharging electricity will be described. As shown in Fig. 9, the maximum demand value is determined by the maximum value of the actual power consumption. It is assumed that a storage battery is introduced with the actual values ​​as shown in Fig. 9. The timing of discharging is the point in time when the power consumption approaches the maximum demand value, as shown in Fig. 10.

[0087] As shown in Figure 10, if discharging is started when the power consumption approaches the maximum demand value, the power discharged from the storage battery is supplied to the load from the start to the end of discharging, so the power received from the grid decreases, and the maximum demand value decreases.

[0088] As shown in Figure 10, in order to discharge, charging must occur at some point. Therefore, as shown in Figure 10, charging starts when power consumption is low (in Figure 10, the part close to minimum or minimum power consumption), and when power consumption starts to rise, charging ends. Power is stored from the start of charging to the end of charging. If this stored power is discharged when power consumption is high, the maximum demand value can be lowered.

[0089] In this way, it is an object of the present invention to allow a user to set the timings for starting and ending charging and the timings for starting and ending discharging with an easy-to-understand GUI. As shown in FIG. 11, the EMS1 provides a GUI that allows a user to draw a charging line on the minimum or minimum part of the power consumption history and a discharging line on the maximum or maximum part of the power consumption history. The EMS1 also provides, with a GUI, how the received power changes according to the past power consumption results based on the charging line and discharging line drawn by the user. This allows the user to visually understand the timing of charging and to easily understand that the maximum demand value can be lowered. Even a user without specialized knowledge can intuitively set the maximum demand value to be lowered.

[0090] The GUI shown in Figure 11 does not show the SOC. Therefore, it is possible that the discharge line is set too high even though there is a lot of remaining charge, and the remaining charge is not utilized, or conversely, the discharge line is set too low even though there is no remaining charge, or the charge line is not set to match the height of the discharge line.

[0091] Therefore, it is preferable that the EMS1 provides a GUI that displays the SOC, as shown in Fig. 12. This allows the user to determine the charge line and the discharge line while checking the remaining charge, making it possible to draw the two lines appropriately.

[0092] (Manual setting example) Based on the above general understanding, an example of the operation when manually setting the discharge line and the charge line will be described with reference to Figures 2 and 3. When correcting the two lines after the initial setting or operation, the operation flows in Figures 2 and 3 are used.

[0093] The control unit 7 displays the power consumption history stored in the memory unit 10 on the display unit 12 (S101), allows the user to draw a discharge line and a charge line (S102: line input means), and displays the discharge line and charge line drawn by the user on the display unit 12 (S103).

[0094] The control unit 7 calculates the change or tendency of change in the SOC, received power, and power consumption when the discharging line and charging line drawn by the user are used for the power consumption history (S104). The reason why it is said "change or tendency of change" here is that the calculation result does not necessarily need to be an accurate prediction, but only needs to be information that can be used as a reference when determining whether the two lines drawn by the user were appropriate.

[0095] The control unit 7 displays on the display unit 12 the changes or trends of changes in the SOC, power consumption, and received power based on the calculation results of S104 for the discharge line, charge line, and power consumption history (S105). The operations of S104 and S105 correspond to a remaining charge depicting means, a received power depicting means, and a consumption depicting means. This display allows the user to visually or intuitively understand how the maximum demand value changes depending on the discharge and charge lines that are drawn.

[0096] There are various possible methods for calculating changes or trends in changes in SOC, received power, and power consumption. For example, the SOC and received power can be simulated by extracting the power consumption [kW] that exceeds the discharge line (or falls below the charge line), integrating the extracted power consumption [kW], and using the integrated value as the target power amount [kWh] to calculate the percentage change in the target power amount [kWh] relative to the total battery capacity [kWh]. In addition, when the SOC is depleted during discharging, the received power is set to equal the power consumption, and when charging, the power consumption that is below the charging line is added to the received power. This will be described in more detail below with reference to FIGS. 19A to 19F.

[0097] The control unit 7 determines whether the power consumption calculated in S104 exceeds a discharge line (first value) (S106). Note that the determination in S106 may be a determination whether the calculated SOC is depleted (reaches a predetermined lower limit (e.g., 0%)). If it does not exceed the limit, the control unit 7 proceeds to the process from A in FIG. If it is exceeded, this means that the line set by the user is inappropriate, so the control unit 7 displays an instruction to raise the discharge line, or an instruction to raise the charge line, or displays both instructions (S107), returns to the operation of S102, and has the user draw two lines again.

[0098] In the process from A in FIG. 3, the control unit 7 determines whether or not the remaining SOC is equal to or greater than a predetermined value (S108).

[0099] The fact that the SOC remains at or above a predetermined value means that there is a possibility that the maximum demand value can be lowered by further discharging, or that the amount of electricity purchased can be reduced by reducing the amount of charge. Therefore, the control unit 7 displays an instruction to lower the discharge line, or an instruction to lower the charge line, or displays both instructions (S109), and returns to the process from B in FIG.

[0100] If the remaining SOC is less than a predetermined value, this means that the line drawn by the user is appropriate, so the control unit 7 displays on the display unit 12 whether or not it is acceptable to determine the discharge line and the charge line (S110). If the user does not make a decision, the control unit 7 returns to the process from B in FIG. If the user has made the decision, the control unit 7 decides the discharge line and the charge line and stores them in the storage unit 10 (S111), and thereafter starts controlling charging and discharging using the discharge line and the charge line (S112).

[0101] It should be noted that the above-described example of the operation during manual setting is merely one example, and the processing procedure and processing contents can be changed as appropriate.

[0102] (An example of an operational flow for calculating and depicting changes or trends in changes in SOC, received power, and power consumption)

[0103] FIG. 19A is a diagram for explaining calculation and depiction of changes or trends in changes in SOC, received power, and power consumption when the power consumption history falls below the charging line.

[0104] 19A, the control unit 7 calculates (integrates) the amount of power [kWh] in the region of the power consumption history that is below the charging line (step 1 in FIG. 19A). Next, the control unit 7 calculates the SOC when the calculated amount of power is charged to the power storage system 2 (step 2 in FIG. 19A).

[0105] For example, if the amount of power in the area below the charging line is 20 [kWh], it is assumed that this amount has been charged to the power storage system 2. In this case, if the SOC before the start of charging was 20% and the total storage capacity of the power storage system 2 was 100 [kWh], it is assumed that the 20 [kWh] has been charged to the power storage system 2, and the SOC is predicted to recover to 40%.

[0106] Based on the above SOC prediction, the control unit 7 displays the change in SOC on the display unit 12 (step 3 in FIG. 19A). For example, as illustrated in FIG. 19A, the control unit 7 displays the change in SOC or its tendency by drawing a straight line from the SOC before the start of charging to the SOC after the end of charging. Note that the actual change in SOC depends on the performance of the power storage system 2, and FIG. 19A merely shows the change in SOC or its tendency. Also, in FIG. 19A, the change in SOC is shown to be reflected slightly after the start and stop of the charging command, but such a delay also depends on the performance of the power storage system 2, and is merely one example of a drawing that makes it easy for the user to understand.

[0107] The control unit 7 depicts the change in the received power due to charging (step 4 in FIG. 19A). During the charging period, the power consumption due to charging increases, so the power consumption history portion is depicted with a dotted line (step 4 in FIG. 19A). The increased power consumption due to charging is depicted as ex1 and ex2 shown in FIG. 19A. In the example of ex1, the control unit 7 depicts the tendency of change in the amount of charging power by depicting the power consumption inverted on the charging line. In the example of ex2, the control unit 7 depicts the tendency of change in power consumption by adding the power consumption of the power storage system 2 when charging the amount of power in the region below the charging line within the charging period to the charging line. Note that in the example of ex2, the shape of the curve depends on the performance of the power storage system 2.

[0108] As an exceptional condition, when the total sum (integral value) of the power consumption history that is below the charging line is charged, the SOC reaches an upper limit (for example, 100%) in the middle. The operation flow considering the exceptional condition of FIG. 19A will be described later with reference to FIG. 19C and FIG. 19D.

[0109] FIG. 19B is a diagram for explaining calculation and depiction of changes or trends in changes in SOC, received power, and power consumption when the power consumption history exceeds the discharge line.

[0110] The control unit 7 calculates (integrates) the amount of power [kWh] in the area of ​​the power consumption history that exceeds the discharge line (step 1 in FIG. 19B). Next, the control unit 7 calculates the SOC when the calculated amount of power is discharged from the power storage system 2 (step 2 in FIG. 19B).

[0111] For example, if the amount of power in the area above the discharge line is 35 [kWh], it is assumed that this amount has been discharged from the power storage system 2. In this case, if the SOC before the start of discharge was 40% and the total storage battery capacity of the power storage system 2 was 100 [kWh], it is assumed that the above 35 [kWh] has been discharged from the power storage system 2, and the SOC is predicted to drop to 5%.

[0112] Based on the above SOC prediction, the control unit 7 displays the change in SOC on the display unit 12 (step 3 in FIG. 19B). For example, as illustrated in FIG. 19B, the control unit 7 displays the change in SOC or its tendency by drawing a straight line from the SOC before the start of discharging to the SOC after the end of discharging. Note that the actual change in SOC depends on the performance of the power storage system 2, and FIG. 19B merely shows the change in SOC or its tendency. Also, in FIG. 19B, the change in SOC is shown to be reflected slightly after the start and stop of the discharge and charge command, but such a delay also depends on the performance of the power storage system 2, and is merely one example.

[0113] The control unit 7 plots the change in the received power due to the discharge (step 4 in FIG. 19A). At this time, as an example, the control unit 7 assumes that the power consumption exceeding the discharge line can be covered by discharging, predicts that the received power during the discharging period will be the same as the discharge line, and plots the change or tendency of the received power.

[0114] During the discharge period, part of the power consumption is covered by the discharge, so the control unit 7 depicts the power consumption in the region above the discharge line with a dotted line (step 4 in FIG. 19A).

[0115] As an exceptional condition, the SOC may reach a lower limit (for example, 0%) before discharging the total sum (integral value) of the history of power consumption exceeding the discharge line. The operation flow considering the exceptional condition in FIG. 19B will be described later with reference to FIG. 19E and FIG. 19F.

[0116] The operation of depicting the remaining charge by the control unit 7 (remaining charge depicting means), the operation of depicting the received power (received power depicting means), and the operation of depicting the power consumption (consumption depicting means) shown in Figures 19A and 19B are merely examples, but by displaying at least one of the remaining charge, received power, and power consumption together with at least one of the power consumption history, the discharge line, and the charge line, information that will be helpful to the user when determining the discharge line and / or the charge line can be displayed in an easy-to-understand manner.

[0117] Next, with reference to Figs. 19C to 19F, an example of the operation flow of the process of calculating and depicting the changes or change trends of the SOC, received power, and power consumption when the above-mentioned exceptional conditions are taken into consideration will be described.

[0118] In Fig. 19C, first, the control unit 7 detects the time ti when the power consumption history falls below the charging line (S701). The control unit 7 calculates the power [kW] that is the difference between the power consumption [kW] at the time ti and the value [kW] of the charging line (S702). The control unit 7 depicts the power consumption [kW] at the time ti with a dotted line (S703). Of course, it may be a line other than the dotted line.

[0119] Next, the control unit 7 adds the calculated power difference [kW] to the SOC at time ti (S704). The control unit 7 expresses the calculated SOC as the SOC at time ti (S705). The control unit 7 expresses the power obtained by adding the power difference [kW] and the charging line [kW] as the received power at time ti (S706). For example, this is expressed as ex1 in FIG. 19A.

[0120] Next, the control unit 7 determines whether or not the SOC at the time ti has reached an upper limit value (for example, 100%) (S707). If the SOC has reached the upper limit, the control unit 7 displays the power consumption and received power indicating that charging will not be performed from the time following the time ti, and displays that the SOC will maintain the upper limit (S708), and ends the process. On the other hand, if it is determined in S707 that the SOC has not reached the upper limit, i is incremented (S709) and the process returns to the operation of S702.

[0121] 19C, the end condition of the repetitive process is whether or not the SOC reaches the upper limit in S707. However, the end condition may further include a determination of whether or not the power consumption history at time ti exceeds the charging line.

[0122] In addition to the operation flow shown in FIG. 19C, the operation flow shown in FIG. 19D is also possible. 19D, first, the control unit 7 detects the time ti when the power consumption history falls below the charge line (S801). The control unit 7 calculates the power Pi [kW], which is the difference between the power consumption [kW] at the time ti and the value [kW] of the charge line (S802). The control unit 7 determines whether the power consumption [kW] at the time ti exceeds the charge line (S803).

[0123] If it is not exceeded, the control unit 7 increments i (S804) and returns to the operation of S802. If it is above the charging line, the control unit 7 calculates the sum of the power differences Pi (S805), thereby determining the amount of power consumption (integral value) in the region where the power consumption history is below the charging line.

[0124] Next, the control unit 7 judges whether or not the power storage system 2 has a remaining SOC sufficient to charge the total amount (S806).

[0125] If the sum remains, the control unit 7 depicts the change in SOC during the period when the sum remains below the threshold until the power storage system 2 charges the sum (S807). After the sum is charged, the control unit 7 depicts the received power as being in accordance with the power consumption history (S808), and ends the process.

[0126] On the other hand, if there is no remaining power, the control unit 7 plots the change in SOC until the SOC of the power storage system 2 reaches the upper limit (S809). The control unit 7 plots the received power after the SOC reaches the upper limit in accordance with the power consumption history (S810), and ends the process.

[0127] In this way, by using the example operational flow shown in Figures 19C and 19D, it is possible to calculate and plot the changes or trends in changes in SOC, received power, and power consumption when the power consumption history is below the charging line.

[0128] Next, an example of the operation flow of calculation and drawing process of changes or change trends of SOC, received power, and power consumption when the power consumption history is above the discharge line will be described with reference to FIGS. 19E and 19F.

[0129] In Fig. 19E, first, the control unit 7 detects the time ti when the history of power consumption exceeds the discharge line (S901). The control unit 7 calculates the power [kW] that is the difference between the power consumption [kW] at the time ti and the value [kW] of the charge line (S902). The control unit 7 depicts the power consumption [kW] at the time ti with a dotted line (S903). Of course, it may be a line other than the dotted line.

[0130] Next, the control unit 7 subtracts the calculated difference power [kW] from the SOC at time ti (S904). The control unit 7 plots the calculated SOC as the SOC at time ti (S905). The control unit 7 plots the discharge line up to time ti as the charge power (S906). For example, the plot is as shown in FIG. 19B.

[0131] Next, the control unit 7 determines whether or not the SOC at the time ti has reached a lower limit value (for example, 0%) (S907). If the SOC has reached the lower limit, the control unit 7 displays the power consumption and received power indicating that no discharge will occur from the time following the time ti, and displays that the SOC will maintain the lower limit (S908), and ends the process. On the other hand, if it is determined in S907 that the SOC has not reached the lower limit, i is incremented (S909) and the process returns to the operation of S902.

[0132] 19E, the end condition of the repetitive process is whether or not the SOC reaches the lower limit in S907. However, the end condition may further include a determination of whether or not the power consumption history at time ti falls below the charging line.

[0133] In addition to the operation flow shown in FIG. 19E, the operation flow shown in FIG. 19F is also possible. In Fig. 19F, first, the control unit 7 detects the time ti when the power consumption history exceeds the charge line (S1001). The control unit 7 calculates the power Pi [kW], which is the difference between the power consumption [kW] at the time ti and the value [kW] of the charge line (S1002). The control unit 7 determines whether the power consumption [kW] at the time ti falls below the charge line (S1003).

[0134] If it is not below the limit, the control unit 7 increments i (S1004) and returns to the operation of S1002. If it is above the charging line, the control unit 7 calculates the sum of the power differences Pi (S1005), thereby determining the amount of power consumption (integral value) in the region where the history of power consumption is above the charging line.

[0135] Next, the control unit 7 determines whether or not the power storage system 2 has a remaining SOC sufficient to discharge the total amount (S1006).

[0136] If it remains, the control unit 7 plots the change in SOC during the period when the SOC is exceeded until the power storage system 2 discharges the total sum (S1007). After the total sum is charged, the control unit 7 plots the received power according to the power consumption history (S1008) and ends the process.

[0137] On the other hand, if there is no remaining power, the control unit 7 plots the change in SOC until the SOC of the power storage system 2 reaches the lower limit (S1009). The control unit 7 plots the received power after the SOC reaches the lower limit in accordance with the power consumption history (S1010), and ends the process.

[0138] In this way, by using the example operation flows shown in Figures 19E and 19F, it is possible to calculate and plot the changes or trends in changes in SOC, received power, and power consumption when the power consumption history exceeds the charging line.

[0139] (GUI example for manual settings) Next, an example of a GUI for manual setting will be described with reference to FIGS. If the two lines entered by the user are not appropriate for the power consumption history and the SOC is depleted, power consumption cannot be covered by discharging, and power will be received from grid 6.

[0140] In such a case, for example, the control unit 7 displays a GUI as shown in Fig. 13. That is, as shown in Fig. 13, the SOC becomes 0% and is depleted, and accordingly the received power increases to the power consumption, and the user can know that the maximum demand value cannot be reduced to the discharge line. As described above, the depletion of the SOC is a value using a lower limit value such as 0%, and a value larger than 0% may be used as the lower limit value.

[0141] In the GUI of Fig. 13, the control unit 7 displays an instruction to raise the discharge line, which allows the user to understand that raising the discharge line will result in an appropriate setting.

[0142] 14 is an example of the GUI after the discharge line is raised. By raising the discharge line, the SOC is not depleted, and power consumption above the discharge line can be covered by discharging the power storage system 2. This allows the user to visually or intuitively understand that the maximum demand value has been lowered to the discharge line.

[0143] Alternatively, as shown in FIG. 15, when the SOC is depleted in the power consumption history, the control unit 7 may display an instruction to raise the charge line because the charge is insufficient. When the SOC has not reached 100% and charging is still possible, the GUI in FIG. 15 may be used, but is not limited thereto.

[0144] As shown in FIG. 16, if the user raises the charge line, the SOC will no longer be depleted, and power consumption above the discharge line can be covered by discharging the power storage system 2, so the user can visually or intuitively understand that the maximum demand value has been reduced to the discharge line.

[0145] It should be noted that an instruction to raise both the discharge line and the charge line may be displayed.

[0146] When the amount of power consumption within a predetermined period is used as a history, the amount of power consumption within the predetermined period may be displayed as a bar graph, as shown in FIG.

[0147] (If automatic setting function is enabled) Next, the operation when the automatic setting function is provided will be described with reference to FIG. The control unit 7 causes the display unit 12 to display the power consumption history (S201), and displays a message asking the user whether or not to use the automatic setting function (S202). If the user selects not to use the automatic setting function, the control unit 7 proceeds to the process from B in FIG.

[0148] On the other hand, if the user selects to use the automatic setting function, the control unit 7 executes an automatic calculation process of the discharge line and the charge line (S203). The control unit 7 displays on the display unit 12 the changes in the received power and the SOC based on the two lines calculated by the automatic calculation process, together with the history of power consumption (S204).

[0149] Then, the control unit 7 prompts the user to determine the two lines (S205). If the user does not determine, the control unit 7 returns to the operation of S202. If the user determines, the control unit 7 stores the two lines in the storage unit 10 (S206) and starts control of charging and discharging using the two lines (S207).

[0150] There are various possible automatic calculation processes, but an example will be described with reference to FIG. 5, FIG. 18A, and FIG. 18B. The control unit 7 recognizes the minimum and maximum in the history of power consumption (S301). Next, the control unit 7 determines the portion from the minimum point to the area equivalent to the chargeable capacity (kWh) of the storage battery based on the SOC at the minimum point (the portion surrounded by the curve including the minimum point of power consumption and the charging line) as the charging line (S302 and FIG. 18A).

[0151] Next, the control unit 7 determines the discharge line so that the area surrounded by the curve including the maximum power consumption point and the discharge line is the same as the area determined in S302 (S303 and FIG. 18B).

[0152] Then, the control unit 7 finely adjusts the charging line and the discharging line in consideration of the amount of purchased power, the degree of margin, and the like (S304).

[0153] (Optimal line determined by AI) The automatic setting function shown in FIG. 5 can be replaced with artificial intelligence (hereinafter, referred to as "AI") determining the discharge line and the charge line. The process of determining the discharge line and the charge line by AI will be described with reference to FIG.

[0154] First, as a premise, the EMS1 is equipped with a model that has learned appropriate charge lines and discharge lines for past power consumption using teacher data, and this learned model is capable of outputting charge lines and discharge lines when the power consumption is input.

[0155] The control unit 7 displays the power consumption history (S401). The control unit 7 inputs the power consumption history to the AI ​​learning model, and outputs the optimal discharge line and charge line calculated by the AI ​​(S402).

[0156] The control unit 7 displays the discharge line and charge line output by the AI ​​on the display unit 12 (S403). The control unit 7 calculates the changes or the trends of changes in the SOC, the received power, and the power consumption based on the discharge line and the charge line (S404). The control unit 7 displays the changes or the trends of changes in the discharge line, the charge line, the power consumption, the received power, and the SOC on the display unit 12 (S405).

[0157] In response to the display result, if the user deems it necessary, the control unit 7 adjusts the discharge line and the charge line (S406), determines the discharge line and the charge line (S407), and starts control (S408).

[0158] In this way, after manual setting, setting by the automatic setting function, or setting of the optimum line by AI, the control unit 7 controls charging and discharging by transmitting a discharge command signal and a charge command signal according to the discharge line and the charge line to the power storage system 2. The processing during control will be described with reference to Figs. 7A and 7B.

[0159] (Processing during control) FIG. 7A shows an operation flow when control is performed using an instantaneous value of power consumption. First, the control unit 7 measures the power consumption (S501). Note that, for example, the power consumption may be calculated as the sum of the received power and the generated power in the system.

[0160] The control unit 7 executes the following process in S502. (1) When the power consumption value exceeds the discharge line value, the control unit 7 sends out a discharge command signal until the current SOC falls below the discharge lower limit SOC value. Note that the discharge lower limit SOC is assumed to be set in advance. (2) When the current SOC falls below the discharge lower limit SOC, the control unit 7 stops the discharge command signal. (3) If the power consumption value falls below the discharge line value while the discharge command signal is being sent, the control unit 7 stops the discharge command signal. In addition, once the discharge command signal is stopped, it is desirable to provide a time limit process to allow a period of time to elapse before the next judgment in order to prevent chattering of the control.

[0161] The control unit 7 executes the following process in S503. (1) When the power consumption value falls below the charging line value, the control unit 7 sends out a charging command signal until the current SOC exceeds the charging upper limit SOC value. Note that the charging upper limit SOC value is assumed to be set in advance. (2) When the current SOC exceeds the charging upper limit SOC, the control unit 7 stops the charging command signal. (3) If the power consumption value exceeds the charge line value while a charge command signal is being sent, the control unit 7 stops sending the charge command signal. In addition, once the charge command signal is stopped, it is desirable to provide a time limit process to wait for the next judgment in order to prevent chattering of the control.

[0162] FIG. 7B shows an operational flow of control during operation when the amount of power for a predetermined period (for example, 30 minutes) is regarded as the power consumption. The control unit 7 measures the power consumption for a predetermined period (S601). Here, the control unit 7 may determine the power consumption as the sum of the received power and the power generated in the system for the predetermined period. That is, the control unit 7 may start calculating and counting the amount of power every hour from 00 minutes to 30 minutes past the hour, and calculate the integrated amount as the demand value for the predetermined period.

[0163] In the operation of S602, the control unit 7 executes the following operations. (1) When the demand value exceeds the discharge line value for a predetermined period of time, the control unit 7 sends out a discharge command signal. (2) When the current SOC falls below the discharge lower limit SOC, the control unit 7 stops the discharge command signal. (3) When it is determined that the demand value for a predetermined period does not exceed the discharge line value within a corresponding unit time (for example, 30 minutes), the control unit 7 stops the discharge command signal.

[0164] In the operation of S603, the control unit 7 executes the following operations. (1) When the demand value falls below the charge line value for a predetermined period of time, the control unit 7 sends out a charge command signal. (2) When the current SOC exceeds the charging upper limit SOC, the control unit 7 stops the charging command signal. (3) If the demand value exceeds the charge line value while a charge command signal is being sent, the control unit 7 stops the charge command signal.

[0165] (Variation 1) The form of the charge line and the discharge line is not limited to the example shown in the figure, and may be short, may be a dashed line, or may be in another form.

[0166] (Variation 2) In the above embodiment, when determining the charge line and the discharge line before control begins, charging is started if the power consumption history is below the charge line, and charging is terminated if the power consumption history is above the charge line, and the control unit 7 displays various information to allow the user to determine the two lines.

[0167] In this regard, charging may be started once the power consumption history falls below the charging line, and charging may be continued until the SOC reaches a set value (e.g., 100%). The SOC, received power, and power consumption may then be predicted and displayed by the control unit 7 together with other information, allowing the user to determine the two lines.

[0168] However, when the history of power consumption exceeds the discharge line during charging, the control unit 7 predicts the SOC, received power, and power consumption so as to stop power reception and start discharging. Depending on the situation, there may be a possibility that the SOC will never reach the set value, so the control unit 7 may stop charging when a set time has elapsed as appropriate, and may predict the SOC, received power, and power consumption. FIG. 20 shows an example of the changes or trends of the SOC, received power, and power consumption at this time.

[0169] When using such settings, after control starts, the SOC will be increased even if the received power increases slightly. Then, when the actual power consumption falls below the charge line, the control unit 7 causes the power storage system 2 to charge for a set time until it reaches a predetermined set value. If the actual power consumption exceeds the discharge line within the set time, the control unit 7 stops the charge command to the power storage system 2 and switches to a discharge command.

[0170] (Variation 3) In the above embodiment, the case where both the discharge line and the charge line are used has been described, but the present invention also includes the case where only the discharge line is used or only the charge line is used. When only the discharge line is used, the method of charging is arbitrary. For example, charging may be performed when a predetermined condition is satisfied, or charging may be performed using a second predetermined value. When only the charging line is used, the method of discharging is arbitrary. For example, discharging may be performed when a predetermined condition is satisfied, or discharging may be performed using a predetermined first value. In this case, at least one of the discharge command signal sending means and the charge command signal sending means may be provided in the EMS 1 .

[0171] Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in every respect and is not intended to limit its scope. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention. The constituent elements of the invention disclosed in this specification are each considered to be independent and stand alone as a single invention. Inventions in which the constituent elements are combined in any combination method are also included in the present invention. The specific expressions in this specification are merely illustrative, and the present invention also includes those that conceptualize the illustrative expressions. [Industrial Applicability]

[0172] The present invention relates to an energy management system and is industrially applicable. [Explanation of symbols]

[0173] 1. Energy Management System 2. Energy storage system 3. Power generation system 4. Load 5. Substation equipment 6 lines 7 Control section 8 Input section 9 Output section 10 Storage section 11 Control section 12 Display section

Claims

1. An energy management system for controlling charging and / or discharging of the power storage system, comprising: a detection means for detecting power consumption or power consumption for a predetermined period in an on-premise system having at least a load and a power storage system; and a storage means for storing the power consumption or a history of the power consumption, The power storage device further includes at least one of a discharge command signal sending means for sending a command to the power storage system to discharge when the power consumption or the amount of power consumption detected by the detection means exceeds a first value, and a charge command signal sending means for sending a command to the power storage system to charge when the power consumption or the amount of power consumption detected by the detection means falls below a second value, When setting the first and / or second values, a discharge line and / or a charge line corresponding to the first and / or second values ​​is displayed, and a history of the power consumption or the amount of power consumption stored in the storage means is displayed; determining the first and / or second values ​​by having a user determine the discharge line and / or the charge line being displayed; an energy management system characterized in that, based on the determined first and / or second values, control of charging and / or discharging of the power storage system is started by the discharge command signal sending means and / or the charge command signal sending means.

2. The energy management system according to claim 1, further comprising a charge remaining amount depicting means for depicting a change or a trend of change in the charge remaining amount of the power storage system when the discharge line and / or the charge line input by the user is used.

3. The energy management system of claim 1, further comprising a power reception depiction means for depicting changes or trends in changes in the received power or amount of received power when using the discharge line and / or the charge line input by the user.

4. The energy management system of claim 1, further comprising a consumption depiction means for depicting the change or trend of change in power consumption or amount of power consumption when using the discharge line and / or the charge line input by the user.

5. The energy management system of claim 4, characterized in that when it is determined that the power consumption or amount of power consumption will exceed the first value when the discharge line and / or charge line input by the user is used, a display is displayed instructing the user to raise the discharge line.

6. The energy management system of claim 4, characterized in that when it is determined that the power consumption or amount of power consumption will exceed the first value when the discharge line and / or charge line input by the user is used, a display is displayed instructing the user to raise the charge line.

7. The energy management system of claim 2, further comprising: a display instructing the user to raise the discharge line when it is determined that the remaining charge will reach a predetermined lower limit value using the discharge line and / or charge line input by the user.

8. The energy management system of claim 2, further comprising: a display instructing the user to raise the charging line when it is determined that the remaining charge will reach a predetermined lower limit value using the discharging line and / or charging line input by the user.

9. The energy management system of claim 2, further comprising: a display instructing the user to lower the discharge line when it is determined that the remaining charge will be equal to or greater than a predetermined value when the discharge line and / or charge line input by the user is used.

10. The energy management system of claim 2, further comprising: a display instructing the user to lower the charging line when it is determined that the remaining charge will be equal to or greater than a predetermined value when the discharging line and / or charging line input by the user is used.

11. A line input means for allowing a user to input the discharge line and / or the charge line is further provided, An energy management system according to any one of claims 1 to 4, characterized in that when setting the first and / or second values, the discharge line and / or the charge line inputted by the line input means are displayed.

12. further comprising an automatic calculation means for automatically calculating the discharge line and / or the charge line; An energy management system as described in any one of claims 1 to 4, characterized in that when setting the first and / or second values, the discharge line and / or the charge line calculated by the automatic calculation means are displayed.

13. 13. The energy management system according to claim 12, wherein the automatic calculation means calculates the discharge line and / or the charge line by artificial intelligence.

14. 13. The energy management system according to claim 12, wherein the discharge line and / or the charge line calculated by the automatic calculation means can be changed by a user.

15. The automatic calculation means determining the charging line such that a charging capacity [kWh] based on the charging line corresponds to a storage capacity [kWh] of the power storage system; 13. The energy management system according to claim 12, wherein the discharge line is determined so that a discharge capacity [kWh] based on the discharge line corresponds to the charge capacity [kWh].

16. An energy management system according to any one of claims 1 to 4, characterized in that the charging line and / or the discharging line can be moved up and down by the user on a graphical user interface.

17. The energy management system according to any one of claims 1 to 4, characterized in that the detection means detects the power consumption or the amount of power consumption based on the received power or amount of received power, the charging power or amount of charging power, and the discharging power or amount of discharging power of the on-site system.

18. An energy management system as described in any one of claims 1 to 4, characterized in that when the on-site system is equipped with a power generation system, the detection means detects the power consumption or the amount of power consumption based on the received power or the amount of power generated by the on-site system, the charged power or the amount of charged power, the discharged power or the amount of discharged power, and the generated power or the amount of generated power.

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