JP2014072918A - Energy management system, management apparatus, and energy management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system, management apparatus, and energy management method, capable of highly efficiently operating a storage battery unit.SOLUTION: An EMS 200 manages electric power supplied to load groups 120 by a storage battery unit 140 with a storage battery 141. The EMS 200 allocates the power storage amount of the storage battery 141 to each of the load group 120 as a virtual power storage amount according to a predetermined percentage. The EMS 200 updates each of the virtual power storage amount according to electric energy supplied to each of the load groups 120 from the storage battery unit 140.

Description

  The present invention relates to an energy management system, a management device, and an energy management method for a consumer including a storage battery unit.

  In recent years, the introduction of storage battery units having storage batteries has progressed in power consumers. The storage battery unit supplies the power stored in the storage battery to the load via the power line.

  A consumer having a storage battery unit can supply power from the storage battery unit to the load as long as the power stored in the storage battery remains, for example, even during a power failure of the system (for example, Patent Document 1).

JP 2002-152976 A

  However, when the storage battery unit supplies power to a plurality of loads, for example, when a power failure occurs in the system, the power stored in the storage battery is exhausted due to the power consumption of some loads (for example, loads that are not essential to daily life). Other loads (eg, loads essential to life) become unusable.

  Then, an object of this invention is to provide the energy management system, management apparatus, and energy management method which can operate a storage battery unit efficiently.

An energy management system according to a first feature includes a storage battery unit having a storage battery, a plurality of loads connected to the storage battery unit via a power line, and a management for managing power supplied from the storage battery unit to the plurality of loads. Device. The management device is configured to assign a storage amount of the storage battery as a virtual storage amount according to a predetermined ratio for each load group to which the plurality of loads belong; and the virtual storage amount allocated to the load group A storage unit for storing. The control unit updates the virtual power storage amount stored in the storage unit according to the amount of power supplied from the storage battery unit to the load group.

  In the first feature, when the electric power is supplied from the storage battery unit to a predetermined load group among the load groups, the control unit calculates the predetermined amount from the virtual power storage amount corresponding to the predetermined load group. The virtual power storage amount stored in the storage unit is updated by reducing the amount of power supplied to the load group.

  1st characteristic WHEREIN: The sensor provided for every said electric power line is further provided, The said control part uses the electric energy supplied to the said load group corresponding to every said electric power line from the said storage battery unit to the measured value of the said sensor. Calculate based on

  In the first feature, further comprising a circuit breaker provided for each of the power lines, and when the virtual storage amount corresponding to a predetermined load group among the plurality of load groups falls below the threshold, the control unit By operating the circuit breaker provided on the power line corresponding to the predetermined load group, power supply from the storage battery unit to the predetermined load group is stopped.

  1st characteristic WHEREIN: The said control part supplies electric power to the said predetermined load group from the said system, when the said circuit breaker is operated.

  1st characteristic WHEREIN: The sensor which detects the electric power supplied to each of the said load which belongs to the said load group is further provided, The said control part is based on the measured value of the said sensor from the said storage battery unit to the said load group. Calculate the amount of power supplied.

  In the first feature, when the virtual power storage amount corresponding to a predetermined load group among the plurality of load groups falls below a threshold value, the control unit suppresses power supply from the storage battery unit to the predetermined load group. To do.

  In the first feature, the control unit acquires a total value of the storage amount of the storage battery, and the control unit virtually transfers the acquired total value of the storage amount to the load group according to the predetermined ratio. The virtual storage amount is reassigned as the storage amount and the virtual storage amount stored in the storage unit is updated.

  In the first feature, a priority is set for the load group, and the control unit assigns a virtual power storage amount having a large ratio to the power storage amount of the storage battery to the load group having a high priority.

  1st characteristic WHEREIN: The said memory | storage part memorize | stores the time zone of each use schedule of the said load group, The said control part is the said load according to the time zone of the use plan memorize | stored in the said memory | storage part. The virtual power storage amount is assigned to a group.

  1st characteristic WHEREIN: The display apparatus which displays the use time zone memorize | stored in the said memory | storage part is further provided.

  The management apparatus which concerns on a 2nd characteristic manages the electric power which the storage battery unit which has a storage battery supplies to several load via a power line. The management device stores the storage amount of the storage battery as a virtual storage amount according to a predetermined ratio for each load group to which the plurality of loads belong, and stores the virtual storage amount allocated to the load group And a storage unit. The control unit updates the virtual power storage amount stored in the storage unit according to the amount of power supplied from the storage battery unit to the load group.

  The energy management method which concerns on a 3rd characteristic manages the electric power which the storage battery unit which has a storage battery supplies to several load via a power line. The energy management method stores a storage amount of the storage battery as a virtual storage amount according to a predetermined ratio for each load group to which the plurality of loads belong, and stores the virtual storage amount allocated to the load group And a step of updating the stored virtual storage amount according to the amount of power supplied from the storage battery unit to the load group.

  ADVANTAGE OF THE INVENTION According to this invention, the energy management system which can operate a storage battery unit efficiently, the management apparatus, and the energy management method can be provided.

FIG. 1 is a diagram illustrating a power transmission and distribution system 1 according to the first embodiment. FIG. 2 is a diagram illustrating the energy management system 100 according to the first embodiment. FIG. 3 is a diagram illustrating a relationship between the storage battery unit 140 and the load group 120 according to the first embodiment. FIG. 4 is a diagram illustrating the EMS 200 according to the first embodiment. FIG. 5 is a diagram illustrating a table stored in the storage unit 220 of the EMS 200 according to the first embodiment. FIG. 6 is a flowchart showing the energy management method according to the first embodiment. FIG. 7 is a flowchart showing step S200 in the energy management method according to the first embodiment. FIG. 8 is a flowchart showing step S300 in the energy management method according to the first embodiment. FIG. 9 is a diagram illustrating an energy management system 100 ′ according to the second modification.

  Hereinafter, an energy management system, a management apparatus, and an energy management method according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
An energy management system according to an embodiment includes a storage battery unit having a storage battery, a plurality of loads connected to the storage battery unit via a power line, and a management device that manages power supplied from the storage battery unit to the plurality of loads. Is provided. The management device is configured to assign a storage amount of the storage battery as a virtual storage amount according to a predetermined ratio for each load group to which the plurality of loads belong; and the virtual storage amount allocated to the load group A storage unit for storing. The control unit updates the virtual power storage amount stored in the storage unit according to the amount of power supplied from the storage battery unit to the load group.

  In the embodiment, the storage amount of the storage battery is assigned as a virtual storage amount to the load group according to a predetermined ratio. Thereby, for example, at the time of a power failure of the system, it is possible to prevent the power stored in the storage battery from running out due to the power consumption of a part of the load, and to efficiently operate the storage battery unit.

[First Embodiment]
(Power transmission / distribution system)
Hereinafter, the energy management system according to the first embodiment will be described. FIG. 1 is a diagram illustrating a power transmission and distribution system 1 according to the first embodiment.

  As shown in FIG. 1, the power transmission and distribution system 1 includes a customer 10, a CEMS 20, a substation 30, a smart server 40, and a power plant 50. The customer 10, the CEMS 20, the substation 30 and the smart server 40 are connected by a network 60.

  The consumer 10 includes, for example, a power generation device and a power storage device. The power generation device is a device that outputs electric power using fuel gas, such as a fuel cell. The power storage device is a device that stores electric power, such as a secondary battery.

  The consumer 10 may be a detached house or an apartment house such as a condominium. Alternatively, the customer 10 may be a store such as a convenience store or a supermarket, a commercial facility such as a building, or a factory.

  In the first embodiment, a customer group 10 </ b> A and a customer group 10 </ b> B are configured by a plurality of consumers 10. The consumer group 10A and the consumer group 10B are classified by, for example, a geographical area.

  The CEMS 20 controls interconnection between the plurality of consumers 10 and the power system. The CEMS 20 may be referred to as a CEMS (Cluster / Community Energy Management System) in order to manage a plurality of consumers 10. Specifically, the CEMS 20 disconnects between the plurality of consumers 10 and the power system at the time of a power failure or the like. On the other hand, the CEMS 20 interconnects the plurality of consumers 10 and the power system when power is restored.

  In the first embodiment, a CEMS 20A and a CEMS 20B are provided. For example, the CEMS 20A controls interconnection between the customer 10 included in the customer group 10A and the power system. For example, the CEMS 20B controls interconnection between the customer 10 included in the customer group 10B and the power system.

  The substation 30 supplies electric power to the plurality of consumers 10 via the distribution line 31. Specifically, the substation 30 steps down the voltage received from the power plant 50.

  In the first embodiment, a substation 30A and a substation 30B are provided. For example, the substation 30A supplies power to the consumers 10 included in the consumer group 10A via the distribution line 31A. For example, the substation 30B supplies power to the consumers 10 included in the consumer group 10B via the distribution line 31B.

  The smart server 40 manages a plurality of CEMSs 20 (here, CEMS 20A and CEMS 20B). The smart server 40 also manages a plurality of substations 30 (here, the substation 30A and the substation 30B). In other words, the smart server 40 comprehensively manages the customers 10 included in the customer group 10A and the customer group 10B. For example, the smart server 40 has a function of balancing the power to be supplied to the consumer group 10A and the power to be supplied to the consumer group 10B.

  The power plant 50 generates power using thermal power, sunlight, wind power, hydraulic power, nuclear power, or the like. The power plant 50 supplies power to the plurality of substations 30 (here, the substation 30A and the substation 30B) via the power transmission line 51.

  The network 60 is connected to each device via a signal line. The network 60 is, for example, the Internet, a wide area network, a narrow area network, a mobile phone network, or the like.

(Energy management system)
Hereinafter, the energy management system 100 according to the first embodiment will be described. FIG. 2 is a diagram illustrating details of the energy management system 100 according to the first embodiment.

  As shown in FIG. 2, the energy management system 100 includes a distribution board 110, a load group 120, a PV unit 130, a storage battery unit 140, a fuel cell unit 150, a hot water storage unit 160, an EMS 200, and a display device. 250. The energy management system 100 is provided in the customer 10.

  In the first embodiment, each device is connected to the power line in the order of the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the load group 120 as viewed from the order close to the system. However, the present invention can also be implemented when the connection between the storage battery unit 140 and the fuel cell unit 150 is reversed.

  Distribution board 110 is connected to distribution line 31 (system) via power line 11. Distribution board 110 is connected to load group 120, PV unit 130, storage battery unit 140, and fuel cell unit 150 through a power line branched from power line 11. As will be described later, when the load group 120 is classified into a plurality of load groups, the power line 11 branches for each load group. The power line branched from the power line 11 is provided with a branch circuit breaker that operates when leakage or overcurrent occurs in the corresponding load group.

  The load group 120 is a device that consumes power supplied via the power line, that is, a group of loads. For example, the load includes devices such as a refrigerator, a freezer, lighting, and an air conditioner. For example, the load group 120 is classified into three load groups (load groups 120-1, 120-2, 120-3) as shown in FIG. Power line 11 branches to power lines L1, L2, and L3, power line L1 is connected to load group 120-1, power line L2 is connected to load group 120-2, and power line L3 is connected to load group 120-3. For example, the load group 120-1 is a group of loads (refrigerator, microwave oven, etc.) used in the kitchen in the residence, and the load group 120-2 is a group of loads (air conditioner, TV, etc.) used in the living room. The load group 120-3 is loads (lighting, personal computers, etc.) used in other rooms in the residence. Branch breakers CB1, CB2, and CB3 are provided on the power lines L1, L2, and L3, respectively (see FIG. 3). Hereinafter, although the load group 120 is demonstrated as what is classified into three load groups 120-1, 120-2, and 120-3, it is not limited to this.

  The PV unit 130 includes a PV 131 and a PCS 132. The PV 131 is an example of a power generation device, and is a solar power generation device that generates power in response to reception of sunlight. The PV 131 outputs the generated DC power. The amount of power generated by the PV 131 changes according to the amount of solar radiation applied to the PV 131. The PCS 132 is a device (Power Conditioning System) that converts DC power output from the PV 131 into AC power. The PCS 132 outputs AC power to the distribution board 110 via the power line.

  In the first embodiment, the PV unit 130 may have a pyranometer that measures the amount of solar radiation irradiated on the PV 131.

  The PV unit 130 is controlled by an MPPT (Maximum Power Point Tracking) method. Specifically, the PV unit 130 optimizes the operating point (a point determined by the operating point voltage value and the power value, or a point determined by the operating point voltage value and the current value) of the PV 131.

  The storage battery unit 140 includes a storage battery 141 and a PCS 142. The storage battery 141 is a device that stores electric power. The PCS 142 is a device (Power Conditioning System) that converts AC power supplied from the distribution line 31 (system) via a power line 143 branched from the power line 11 into DC power. Further, the PCS 142 converts DC power output from the storage battery 141 into AC power.

  The fuel cell unit 150 includes a fuel cell 151 and a PCS 152. The fuel cell 151 is an example of a power generation device, and is a device that outputs electric power using fuel gas. The PCS 152 is a device (Power Conditioning System) that converts DC power output from the fuel cell 151 into AC power.

  The hot water storage unit 160 is an example of a heat storage device that converts electric power into heat, accumulates the converted heat as hot water, and stores heat generated by a cogeneration device such as the fuel cell unit 150 as hot water. Specifically, the hot water storage unit 160 has a hot water storage tank, and warms water supplied from the hot water storage tank by exhaust heat generated by the operation (power generation) of the fuel cell 151. Specifically, the hot water storage unit 160 warms the water supplied from the hot water storage tank and returns the warmed hot water to the hot water storage tank.

  The EMS 200 is an apparatus (Energy Management System) that controls the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the hot water storage unit 160. Specifically, the EMS 200 is connected to the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the hot water storage unit 160 via signal lines, and the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the hot water storage unit. 160 is controlled using a signal conforming to a protocol such as Echonet Lite or ZigBee (registered trademark).

  The EMS 200 is connected to various servers via the network 60. Various servers store, for example, information (hereinafter referred to as energy charge information) such as the unit price of power supplied from the grid, the unit price of power received from the grid, and the unit price of fuel gas.

  Or various servers store the information (henceforth energy consumption prediction information) for predicting the power consumption of the load group 120, for example. The energy consumption prediction information may be generated based on, for example, past performance values of power consumption of the load group 120. Alternatively, the energy consumption prediction information may be a model of power consumption of the load group 120.

  Or various servers store the information (henceforth PV power generation amount prediction information) for predicting the power generation amount of PV131, for example. The PV power generation prediction information may be a predicted value of the amount of solar radiation irradiated on the PV 131. Alternatively, the PV power generation prediction information may be weather forecast, season, sunshine time, and the like.

  The display device 250 is connected to the EMS 200, and displays various types of information stored in the EMS 200 by an application. The connection format between the EMS 200 and the display device 250 may be wired or wireless. The display device 250 may include an operation unit such as a touch panel. In such a case, the user inputs control information for controlling a device connected to the EMS 200 via the operation unit, and the display device 250 transmits the control information input by the user to the EMS 200.

(Storage battery unit and load group)
Below, the relationship between the storage battery unit which concerns on 1st Embodiment, and a load group is demonstrated. FIG. 3 is a diagram illustrating a relationship between the storage battery unit 140 and the load group 120 according to the first embodiment.

  The power line 143 is connected to the power line 144 between the power line 11 and the storage battery unit 140. The power line 144 connects the storage battery unit 140 and the load group 120. The power line 143 includes a switch SW1 on the power line 11 side (that is, the side closer to the grid) than the connection point with the power line 144, and the power line 144 has a switch SW2 between the connection point with the power line 143 and the load group 120. Prepare. The switches SW1 and SW2 maintain the connection of the power line when turned on, and cut off the connection of the power line when turned off. The switches SW1 and SW2 are connected to the EMS 200 via a signal line, and are operated by a signal received from the EMS 200 to switch on or off.

  As illustrated in FIG. 3, the power line 144 branches on the way to the load group 120 to become power lines 144-1, 144-2, and 144-3. The power lines 144-1, 144-2, 144-3 are connected to the power lines L1, L2, L3 in the branch breakers CB1, CB2, CB3, respectively.

  The power lines 144-1, 144-2, 144-3 are provided with sensors CT1, CT2, CT3 for detecting the power supplied from the storage battery unit 140 to the load groups 120-1, 120-2, 120-3, respectively. It has been. The sensors CT1, CT2, CT3 are connected to the EMS 200 via signal lines, and transmit measured values to the EMS 200.

  Further, the power lines 144-1, 144-2, 144-3 have circuit breakers B1, B2, B3 for maintaining or disconnecting the connection between the storage battery unit 140 and the load groups 120-1, 120-2, 120-3. Each is provided. The circuit breakers B1, B2, and B3 maintain the connection of the power line when turned on, and disconnect the connection of the power line when turned off. The circuit breakers B1, B2, and B3 are connected to the EMS 200 via a signal line, are switched on and off by a signal received from the EMS 200, and maintain or disconnect the connection with the power line.

(Configuration of EMS)
Hereinafter, the EMS according to the first embodiment will be described. FIG. 4 is a block diagram showing the EMS 200 according to the first embodiment. FIG. 5 is a diagram illustrating a table stored in the storage unit 220 of the EMS 200 according to the first embodiment.

  As illustrated in FIG. 4, the EMS 200 includes a communication unit 210, a storage unit 220, and a control unit 230.

  The communication unit 210 transmits / receives various signals to / from the connected device via a signal line. For example, the communication unit 210 may receive information indicating the power generation amount of the PV 131 from the PV unit 130. The communication unit 210 may receive information indicating the storage amount of the storage battery 141 from the storage battery unit 140. The communication unit 210 may receive information indicating the power generation amount of the fuel cell 151 from the fuel cell unit 150. The communication unit 210 may receive information indicating the amount of hot water stored in the hot water storage unit 160 from the hot water storage unit 160. The communication unit 210 may receive information input by the user from the display device 250 via, for example, a touch panel provided on the display device 250.

  In the first embodiment, the communication unit 210 may receive energy fee information, energy consumption prediction information, and PV power generation amount prediction information from various servers via the network 60. Moreover, the communication part 210 transmits the signal for controlling the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the hot water storage unit 160 to each apparatus, for example.

  The storage unit 220 stores information received by the communication unit 210. In addition, the storage unit 220 stores control information set by the control unit 230 in order to control the connected device.

  The controller 230 controls the load group 120, the PV unit 130, the storage battery unit 140, the fuel cell unit 150, the hot water storage unit 160, and the display device 250 using signals conforming to a protocol such as Echonet Lite or ZigBee (registered trademark). Control.

  Next, control of the storage battery unit 140 by the control unit 230 when power is supplied from the storage battery unit 140 to the load group 120 will be described. Here, it should be noted that the grid and the customer 10 are disconnected from each other due to, for example, a grid power failure or power instability, and the storage battery unit 140 supplies power to the load group 120 alone.

  In the first embodiment, the control unit 230 turns off the switch SW1 and turns on the switch SW2. Moreover, the control part 230 turns on circuit breaker B1, B2, B3, and maintains the connection of electric power line 144-1, 144-2, 144-3. Thereby, the output power from the storage battery unit 140 is supplied to the load group 120 via the power line 144 without passing through the power line 11.

  In 1st Embodiment, the control part 230 acquires the electrical storage amount of the storage battery 141 from the storage battery unit 140, and allocates the acquired electrical storage amount to a load group as a virtual electrical storage amount according to a predetermined | prescribed ratio. As illustrated in FIG. 3, the control unit 230 includes a virtual power storage amount V1 for the load group 120-1, a virtual power storage amount V2 for the load group 120-2, a load group 120-2, and a virtual power storage amount V3 for the load group 120-3. Assign group 120-3. The virtual storage amounts V1, V2, and V3 are amounts of power obtained by distributing the total storage amount (measured amount of storage amount) of the storage battery 141 at a predetermined ratio. For example, the predetermined ratio may be set by the user via an operation unit such as a touch panel provided on the display device 250. For example, the predetermined ratio may be set according to the priority order of the load group corresponding to each virtual power storage amount. For example, the ratio of load groups with high priority (for example, load groups that include loads indispensable to life) is high, and the ratio of load groups with low priority (for example, load groups that do not include loads indispensable to life) is low. It may be set to be. The storage unit 220 stores virtual power storage amounts V1, V2, and V3 assigned to the load groups 120-1, 120-2, and 120-3.

  Control unit 230 calculates the amount of electric power supplied from storage battery unit 140 to load groups 120-1, 120-2, and 120-3 based on the measured values of sensors CT1, CT2, and CT3, respectively. The control unit 230 subtracts the amount of power supplied from the storage battery unit 140 to the load group from the virtual storage amount, and updates the virtual storage amount stored in the storage unit 220.

  That is, the control unit 230 determines the amount of power P1 supplied from the storage battery unit 140 to the load group 120-1, the amount of power P2 supplied to the load group 120-2, and the load based on the measured values of the sensors CT1, CT2, and CT3. The amount of power P3 supplied to the group 120-3 is calculated. In this case, the reduction amount of the storage amount of the storage battery 141 is actually the sum of P1, P2, and P3, but the control unit 230 sets the decrease amount of the virtual storage amount V1 as P1 and the decrease amount of the virtual storage amount V2. The amount of electricity stored in the storage battery 141 is managed by setting the amount of decrease in P2 and the virtual amount of electricity V3 as P3.

  The storage unit 220 stores a threshold value (lower limit value) of the virtual power storage amount. The threshold value may be zero, for example. When the amount of virtual power storage falls below the threshold, control unit 230 stops power supply from storage battery unit 140 to the load group. For example, in FIG. 3, when the virtual power storage amount V <b> 1 falls below the threshold value, the control unit 230 switches the circuit breaker B <b> 1 from on to off, and stops power supply from the storage battery unit 140 to the load group 120-1.

  Next, control of the storage battery unit 140 by the control unit 230 when the storage battery unit 140 is supplied with power from the system will be described.

  In the first embodiment, the control unit 230 turns on the switch SW1 and turns off the switch SW2. Thereby, the connection of the power line 143 is maintained, and the power supply from the system to the storage battery unit 140 becomes possible. When the storage battery 141 accumulates electric power, the control unit 230 acquires a total value (actually measured value) of the storage amount of the storage battery 141 from the storage battery unit 140. The control unit 230 reassigns the acquired total value of the storage amount as a virtual storage amount according to a predetermined ratio, and updates the virtual storage amount stored in the storage unit 220. In addition, the control unit 230 may periodically acquire the total amount of power stored in the storage battery 141 from the storage battery unit 140 and reassign the virtual power storage amount in order to calibrate the measurement error of the sensor.

  Further, the user may set a time zone in which the load group is scheduled to be used. In this case, the user may input a scheduled time zone for use of the load group via an operation unit such as a touch panel provided on the display device 250, for example. The storage unit 220 stores a scheduled time zone for use of the load group. The control unit 230 allocates the virtual power storage amount to the load group according to the scheduled use time zone stored in the storage unit 220. The display device 250 may display a scheduled time zone for use of the load group stored in the storage unit 220. As illustrated in FIG. 5, the storage unit 220 includes a total value (actual value) of the storage amount of the storage battery 141, a virtual storage amount (remaining amount), an amount of power supplied to the load group corresponding to the virtual storage amount, A predetermined ratio of the charged amount, a scheduled use time zone of each load group, and the like are stored in a table format.

(Energy management method)
Hereinafter, an energy management method according to the first embodiment will be described. 6 to 8 are flowcharts showing the energy management method according to the first embodiment.

  As shown in FIG. 6, in step S100, the EMS 200 performs a virtual storage amount allocation process. That is, the EMS 200 assigns the amount of power stored in the storage battery 141 to the load groups 120-1, 120-2, and 120-3 as virtual power storage amounts V1, V2, and V3 according to a predetermined ratio.

  In step S110, the EMS 200 determines whether or not to supply power to the load group 120 from the storage battery unit 140, that is, the discharge process of the storage battery unit 140. The EMS 200 performs the process of step S200 when the determination result is “YES”, and performs the process of step S120 when the determination result is “NO”.

  In step S120, the EMS 200 determines whether to charge the storage battery unit 140, that is, whether to supply power to the storage battery unit 140 from the system. If the determination result is “YES”, the EMS 200 performs the process of step S300.

  FIG. 7 is a flowchart showing step S200 in the energy management method according to the first embodiment. Step S200 is an energy management flow during the discharging process of the storage battery unit 140. Step S200 is repeatedly performed for each virtual power storage amount. Hereinafter, a process for the virtual power storage amount V1 will be described as an example. Step S200 is periodically performed when the storage battery unit 140 is discharged.

  As illustrated in FIG. 7, in step S210, the EMS 200 acquires a virtual power storage amount V1.

  In step S220, the EMS 200 calculates the amount of power P1 supplied from the storage battery unit 140 to the load group 120-1 based on the measurement value of the sensor CT1.

  In step S230, the EMS 200 subtracts the power amount P1 from the virtual power storage amount V1, and updates the virtual power storage amount V1.

  In step S240, the EMS 200 determines whether or not the updated virtual power storage amount V1 exceeds a threshold value. When the determination result is “YES”, the EMS 200 ends the process for the virtual power storage amount V1 and performs the process for the virtual power storage amount V2. If the determination result is “NO”, the EMS 200 performs the process of step S250.

  In step S250, the EMS 200 stops power supply from the storage battery unit 140 to the load group 120-1. The EMS 200 repeats the processing from step S210 to step S250 for each virtual power storage amount.

  FIG. 8 is a flowchart showing step S300 in the energy management method according to the first embodiment. Step S300 is an energy management flow performed at the end of the charging process of the storage battery unit 140. As shown in FIG. 8, in step S <b> 310, the EMS 200 acquires the total value of the storage amount of the storage battery 141 from the storage battery unit 140.

  In step S320, the EMS 200 reassigns the acquired power storage amount to each virtual power storage amount according to a predetermined ratio.

  In step S330, the EMS 200 updates the stored virtual power storage amount.

  As described above, in the first embodiment, the EMS 200 assigns the storage amount of the storage battery 141 to the load group as a virtual storage amount according to a predetermined ratio. The EMS 200 updates the stored virtual power storage amount according to the amount of power supplied from the storage battery unit 140 to the load group. Thereby, for example, at the time of a power failure of the system, it is possible to prevent the power stored in the storage battery from running out due to the power consumption of a part of the load, and to efficiently operate the storage battery unit.

[Modification 1]
Below, the energy management system which concerns on the modification 1 is demonstrated centering on difference with the energy management system which concerns on 1st Embodiment.

  In the first modification, the grid and the energy consumer 10 are in an interconnected state. When the power supply from the storage battery unit 140 to the load group is stopped, the EMS 200 may supply power to the load group from the system. As shown in FIG. 3, when electric power is supplied from the storage battery unit 140 to the load groups 120-1, 120-2, 120-3, the EMS 200 turns on the circuit breakers B1, B2, B3. For example, when the virtual power storage amount V1 assigned to the load group 120-1 falls below the threshold, the EMS 200 switches the circuit breaker B1 from on to off. As a result, the connection of the power line 144-1 is disconnected in the circuit breaker B1, and the power supply from the storage battery unit 140 to the load group 120-1 is stopped. Here, when the interconnection between the grid and the energy management system 100B is maintained, the load group 120-1 can receive power supply from the grid via the power line L1.

  As described above, in the first modification, when the load group consumes a certain amount or more of the power storage amount of the storage battery 141 and the allocated virtual power storage amount falls below the threshold, the power supply from the system is received. it can. Thereby, the energy management system 100 can prevent further consumption of the storage amount of the storage battery 141, and can efficiently manage the output power from the storage battery unit 140.

[Modification 2]
In the following, an energy management system according to Modification 2 will be described focusing on differences from the energy management system according to the first embodiment. FIG. 9 is a diagram showing an energy management system 100 ′ according to the second modification.

  In FIG. 9, the energy management system 100 ′ includes a sensor corresponding to each load included in the load group 120 and a circuit breaker. Specifically, the power supplied to each load is detected between the branch breakers CB1, CB2 and CB3 and each load (for example, loads X1 to X7 shown in FIG. 9) on the power lines L1, L2 and L3. Sensors c (for example, sensors c1 to c7 shown in FIG. 9) and circuit breakers b (for example, circuit breakers b1 to b7 shown in FIG. 9) for maintaining or disconnecting the power line are provided. The sensor c is connected to the EMS 200 via a signal line, and transmits a measurement value to the EMS 200. The circuit breaker b is connected to the EMS 200 via a signal line, and is switched on or off by a signal received from the EMS 200 to maintain or disconnect the connection of the power line.

  The user arbitrarily selects a load included in the load group 120, and is physically classified by the power lines L1, L2, and L3 (that is, the load groups 120-1, 120-2, and 120 in the first embodiment). -3), a load group can be configured. For example, the user can configure the load group Y1 from the load X1 corresponding to the sensor c1 and the load X4 corresponding to the sensor c4, and set the ratio of the virtual storage amount VY1 assigned to the load group Y1. In such a case, the EMS 200 calculates the amount of power PY1 supplied from the storage battery unit 140 to the load group Y1 by adding the measured values of the sensor c1 and the sensor c4. The EMS 200 updates the stored virtual power storage amount VY1 based on the calculated power amount PY1.

  The EMS 200 stops power supply from the storage battery unit 140 to either the load X1 or the load X4 when the virtual power storage amount VY1 falls below the threshold value. In this case, the EMS 200 switches the circuit breaker b (the circuit breaker b1 or the circuit breaker b4) corresponding to the load to be stopped from ON to OFF, and interrupts the connection of the power line.

  As described above, in the second modification, the sensors and circuit breakers corresponding to the loads included in the load group 120 are provided, so that the user can arbitrarily select the load and configure the load group. Thereby, EMS200 manages the output electric power from a storage battery unit efficiently by allocating virtual electrical storage amount to a load group comprised by the load which the user selected at a predetermined ratio.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  The EMS 200 may be a HEMS (Home Energy Management System), a SEMS (Store Energy Management System), a BEMS (Building Energy Management System), or an FEM. There may be.

  In the embodiment, the customer 10 includes a load group 120, a PV unit 130, a storage battery unit 140, a fuel cell unit 150, and a hot water storage unit 160. However, the consumer 10 should just have the load group 120 and the storage battery unit 140 at least.

  In the embodiment, the storage battery 141 of the storage battery unit 140 has been described as storing power supplied from the system. However, for example, the power output from the PV unit 130 or the fuel cell unit 150 may be stored.

  The fuel cell 151 of the fuel cell unit 150 may be, for example, an SOFC or a PEFC.

  DESCRIPTION OF SYMBOLS 1 ... Power transmission / distribution system, 10 ... Consumer, 11 ... Power line, 20 ... CEMS, 30 ... Substation, 31 ... Distribution line, 40 ... Smart server, 50 ... Power plant, 51 ... Transmission line, 60 ... Network, 100, DESCRIPTION OF SYMBOLS 100 '... Energy management system, 110 ... Distribution board, 120 ... Load group, 120-1, 120-2, 120-3 ... Load group, 130 ... PV unit, 131 ... PV, 132 ... PCS, 140 ... Storage battery unit , 141 ... storage battery, 142 ... PCS, 143 ... power line, 144 ... power line, 150 ... fuel cell unit, 151 ... fuel cell, 152 ... PCS, 160 ... hot water storage unit, 200 ... EMS, 210 ... communication part, 220 ... storage part , 230 ... control unit, 250 ... display device, CB1, CB2, CB3 ... branch circuit breaker, CT1, CT2, CT3 ... sensor, B1, B2, B ... breaker, L1, L2, L3 ... power lines, SW1, SW2 ... switch, V1, V2, V3 ... virtual storage amount

Claims (13)

An energy management system comprising a storage battery unit having a storage battery, a plurality of loads connected to the storage battery unit via a power line, and a management device for managing the power supplied to the plurality of loads by the storage battery unit,
The management device
A control unit that allocates the storage amount of the storage battery as a virtual storage amount according to a predetermined ratio for each load group to which the plurality of loads belong;
A storage unit that stores the virtual power storage amount allocated to the load group,
The said control part updates the said virtual electrical storage amount memorize | stored in the said memory | storage part according to the electric energy supplied to the said load group from the said storage battery unit, The energy management system characterized by the above-mentioned.   When power is supplied from the storage battery unit to a predetermined load group among the load groups, the control unit is supplied to the predetermined load group from the virtual storage amount corresponding to the predetermined load group. The energy management system according to claim 1, wherein the virtual power storage amount stored in the storage unit is updated by reducing the amount of electric power. A sensor provided for each power line;
3. The energy management system according to claim 2, wherein the control unit calculates an amount of power supplied from the storage battery unit to the load group corresponding to each power line based on a measurement value of the sensor. . Further comprising a circuit breaker provided for each power line,
When the virtual power storage amount corresponding to a predetermined load group among the plurality of load groups falls below a threshold, the control unit operates the circuit breaker provided on the power line corresponding to the predetermined load group. The energy management system according to claim 3, wherein power supply from the storage battery unit to the predetermined load group is stopped.   The energy management system according to claim 4, wherein when the circuit breaker is operated, the control unit supplies power to the predetermined load group from a system. A sensor for detecting electric power supplied to each of the loads belonging to the load group;
The energy management system according to claim 2, wherein the control unit calculates an amount of electric power supplied from the storage battery unit to the load group based on a measurement value of the sensor.   The control unit suppresses power supply from the storage battery unit to the predetermined load group when the virtual power storage amount corresponding to the predetermined load group among the plurality of load groups falls below a threshold value. The energy management system according to claim 6. The control unit acquires a total value of the storage amount of the storage battery,
The control unit reallocates the total value of the acquired power storage amount as a virtual power storage amount to the load group according to the predetermined ratio, and updates the virtual power storage amount stored in the storage unit. The energy management system according to claim 1, wherein the system is an energy management system. Priorities are set for the load groups,
The energy management system according to claim 1, wherein the control unit assigns a virtual power storage amount having a large ratio to the power storage amount of the storage battery to the load group having a high priority. The storage unit stores a scheduled time zone for each of the load groups,
The energy management system according to claim 1, wherein the control unit assigns the virtual power storage amount to the load group according to a scheduled time zone stored in the storage unit.   The energy management system according to claim 10, further comprising a display device that displays a scheduled time zone stored in the storage unit. A management device that manages power supplied to a plurality of loads by a storage battery unit having a storage battery via a power line, wherein the storage amount of the storage battery is determined according to a predetermined ratio for each load group to which the plurality of loads belong. A control unit assigned as a virtual storage amount,
A storage unit that stores the virtual power storage amount allocated to the load group,
The said control part updates the said virtual electrical storage amount memorize | stored in the said memory | storage part according to the electric energy supplied to the said load group from the said storage battery unit. An energy management method for managing power supplied to a plurality of loads by a storage battery unit having a storage battery via a power line,
Allocating the storage amount of the storage battery as a virtual storage amount according to a predetermined ratio for each load group to which the plurality of loads belong;
Storing the virtual power storage amount allocated to the load group;
Updating the stored virtual storage amount according to the amount of power supplied from the storage battery unit to the load group.

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