JP2013207937A - Energy management system and energy management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system and an energy management method capable of appropriately using electric power output from a distributed power source.
SOLUTION: A fuel cell 151 operates so that a value detected by an ammeter 181 approaches a first target power reception amount. The storage battery 141 operates using the value detected by the ammeter 182 so that the amount of power received at the location where the ammeter 181 is provided approaches the second target power reception amount. The first target power reception amount is smaller than the second target power reception amount.
[Selection] Figure 2

Description

  The present invention relates to an energy management system including a distributed power source and a power storage device, and an energy management method used in the energy management system.

  In recent years, a technique for controlling a distributed power source and a power storage device in an energy management system having the distributed power source and the power storage device has been proposed (for example, Patent Document 1). A distributed power source is a device that outputs 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.

  Here, the distributed power supply is controlled so that the power output from the distributed power supply follows a value detected by an ammeter provided on a power line connecting the system and the distributed power supply (load following control). In other words, the distributed power supply is controlled such that the value detected by the ammeter becomes the target received power (for example, “0”). The target received power of the distributed power source is a target value for the amount of power supplied from the system side of the ammeter.

  On the other hand, the power storage device is controlled such that a value detected by an ammeter provided on a power line connecting the grid and the power storage device becomes a target received power (for example, “0”) (charge / discharge control). ). The target received power of the power storage device is a target value for the amount of power supplied from the system side of the ammeter.

JP 2007-104775 A JP-A-2005-143218

  By the way, in the state which outputs rated power, the efficiency of a distributed power supply is high. Further, depending on the temperature state of the distributed power supply, the power that can be output is less than the rated power. In order for the distributed power supply to output the rated power or the maximum power that can be output, it is important how to control charging / discharging of the power storage device. For example, it is conceivable to store in the power storage device the amount of power obtained by removing the load power from the rated power of the distributed power source. However, in order to realize such control, the power storage device needs to know the rated power and the maximum output power of the distributed power supply.

  Therefore, the present invention has been made to solve the above-described problem, and appropriately controls charging / discharging of a power storage device even if the power storage device does not know the rated power and the maximum outputable power of the distributed power source. An object of the present invention is to provide an energy management system and an energy management method that enable the above.

  The energy management system according to the first feature includes a distributed power source and a power storage device. A first ammeter used for load follow-up control of the distributed power source and a second ammeter used for charge / discharge control of the power storage device are provided on a power line connecting the distributed power source and the power storage device to the system. The first ammeter is provided on a side closer to the system than a connection point between the power storage device and the power line and a connection point between the distributed power source and the power line. The distributed power supply operates so that a value detected by the first ammeter approaches a first target power reception amount. The power storage device operates using a value detected by the second ammeter so that the amount of power received at a location where the first ammeter is provided approaches the second target power reception amount. The first target power reception amount is smaller than the second target power reception amount.

  In the first feature, the second ammeter is closer to the system than a connection point between the power storage device and the power line, and closer to the system than a connection point between the distributed power source and the power line. On the side. The power storage device uses the value detected by the second ammeter to charge the power storage device so that the amount of power received at the location where the first ammeter is provided becomes the second target power reception amount. Control the amount of discharge.

  In the first feature, the second ammeter is provided closer to the system than a connection point between the power storage device and the power line and a connection point between the distributed power source and the power line. The power storage device controls a change amount of the charge / discharge amount of the power storage device so that a value detected by the second ammeter becomes a second target power reception amount.

  The energy management method according to the second feature is used in an energy management system including a distributed power source and a power storage device. In order to use the energy management method for load follow-up control of the distributed power supply on the power line connecting the distributed power source and the power storage device to the system, the connection point between the power storage device and the power line, the distributed power source, and the power source A first current measuring step for detecting a current closer to the system than a connection point with a power line; a second current measuring step for detecting a current used for charge / discharge control of the power storage device; and the first current. The first ammeter is provided using the step of operating the distributed power supply so that the value detected by the detection step approaches the first target power reception amount, and the value detected by the second current detection step. And the step of operating the power storage device so that the amount of received power at a location close to the second target received amount. The first target power reception amount is smaller than the second target power reception amount.

  According to the present invention, there is provided an energy management system and an energy management method capable of appropriately controlling charge / discharge of a power storage device without the power storage device knowing the rated power and the maximum output power of the distributed power source. be able to.

FIG. 1 is a diagram illustrating an energy management system 100 according to the first embodiment. FIG. 2 is a diagram illustrating the customer 10 according to the first embodiment. FIG. 3 is a diagram illustrating the HEMS 200 according to the first embodiment. FIG. 4 is a flowchart showing the energy management method according to the first embodiment. FIG. 5 is a flowchart showing the customer 10 according to the first modification.

  Hereinafter, an energy management system 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]
The energy management system according to the embodiment includes a distributed power source and a power storage device. A first ammeter used for load follow-up control of the distributed power source and a second ammeter used for charge / discharge control of the power storage device are provided on a power line connecting the distributed power source and the power storage device to the system. The first ammeter is provided on a side closer to the system than a connection point between the power storage device and the power line and a connection point between the distributed power source and the power line. The distributed power supply operates so that a value detected by the first ammeter approaches a first target power reception amount. The power storage device operates so that a value detected by the second ammeter approaches a second target power reception amount. The first target power reception amount is smaller than the second target power reception amount.

  In the embodiment, the first target power reception amount used for load follow-up control of the distributed power supply is smaller than the second target power reception amount used for charge / discharge control of the power storage device. Therefore, the output power of the distributed power source increases due to the difference between the first target power reception amount and the second target power reception amount. When the output power of the distributed power source increases, the charge / discharge amount of the power storage device decreases. When the power consumption of the device (mainly the load) provided downstream from the first ammeter is smaller than the rated power of the distributed power source, the output power of the distributed power source increases by repeating such an operation. The power storage device is charged. On the other hand, when the power consumption of equipment (mainly the load) provided downstream from the first ammeter is larger than the rated power of the distributed power supply, the power consumption cannot be covered by the output power of the distributed power supply. The device is discharged.

  Thus, even if the power storage device does not know the rated power or the maximum output possible power of the distributed power supply, charging / discharging of the power storage device is appropriately controlled.

  In the embodiment, since the first ammeter is provided on the side closer to the system than the connection point between the power storage device and the power line and the connection point between the distributed power source and the power line, control power for controlling the distributed power source, The power stored in the power storage device and the control power for controlling the power storage device are considered in the load following control.

[First Embodiment]
(Energy management system)
Hereinafter, the energy management system according to the first embodiment will be described. FIG. 1 is a diagram illustrating an energy management system 100 according to the first embodiment.

  As shown in FIG. 1, the energy management system 100 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 customer 10 has at least a distributed power source and a power storage device. A distributed power source is a device that outputs 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.

  For example, the customer 10 may be a single-family house, an apartment house such as a condominium, 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 supplied 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, wind power, hydraulic power, nuclear power, and 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.

(Customer)
Below, the consumer which concerns on 1st Embodiment is demonstrated. FIG. 2 is a diagram illustrating details of the customer 10 according to the first embodiment.

  As shown in FIG. 2, the customer 10 includes a distribution board 110, a load 120, a PV unit 130, a storage battery unit 140, a fuel cell unit 150, a hot water storage unit 160, and a HEMS 200.

  In the first embodiment, the customer 10 includes an ammeter 181 and an ammeter 182. The ammeter 181 and the ammeter 182 are provided on a power line connecting the storage battery unit 140 and the fuel cell unit 150 and the system. The ammeter 181 is used for load following control of the fuel cell unit 150. The ammeter 182 is used for charge / discharge control of the storage battery unit 140.

  In the first embodiment, the ammeter 181 is provided upstream of the connection point P2 between the storage battery unit 140 and the power line and the connection point P3 between the fuel cell unit 150 and the power line (closer to the system). The ammeter 182 is provided downstream of the connection point P2 between the storage battery unit 140 and the power line (on the side away from the system) and upstream of the connection point P3 between the fuel cell unit 150 and the power line (on the side close to the system). It is done.

  Of course, the ammeter 181 and the ammeter 182 are provided upstream of the connection point P4 between the load 120 and the power line (on the side closer to the grid).

  In the first embodiment, it should be noted that 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 120 as viewed from the order close to the grid.

  Distribution board 110 is connected to distribution line 31 (system). Distribution board 110 is connected to load 120, PV unit 130, storage battery unit 140, and fuel cell unit 150 via a power line.

  The load 120 is a device that is connected to the power line at the connection point P4 and consumes power supplied through the power line. For example, the load 120 includes devices such as a refrigerator, lighting, an air conditioner, and a television. The load 120 may be a single device or may include a plurality of devices.

  The PV unit 130 is connected to the power line at the connection point P <b> 1 and includes a PV 131 and a PCS 132. The PV 131 is an example of a distributed power source, and is a 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 is connected to the power line at the connection point P <b> 2 and 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) into DC power. Further, the PCS 142 converts DC power output from the storage battery 141 into AC power.

  The storage battery unit 140 operates by charge / discharge control. Specifically, the storage battery unit 140 controls the charge / discharge amount of the storage battery 141 based on the current value detected by the ammeter 182. In other words, the storage battery 141 operates using the value detected by the ammeter 182 so that the received power at the location where the ammeter 181 is provided approaches the second target received power.

  Specifically, the second target received power is “X”, and the received power at the location where the ammeter 181 is provided (specified using a value detected by the ammeter 182 as will be described later). Value) is “Y” and the charge / discharge amount is “C”, the charge / discharge amount C is controlled to satisfy the expression “C = Y−X”.

  That is, the storage battery 141 uses the value detected by the ammeter 182 to control the charge / discharge amount of the storage battery 141 so that the received power at the location where the ammeter 181 is provided becomes the second target received power. To do. Specifically, the storage battery 141 adds the charge / discharge amount of the storage battery 141 to the value detected by the ammeter 182, and specifies the power reception at the location where the ammeter 181 is provided. Subsequently, the storage battery 141 controls the charge / discharge amount of the storage battery 141 so that the specified received power amount becomes the second target received power. In 1st Embodiment, charging / discharging of the storage battery 141 is performed in real time in this way.

  The second target received power is a target value for the amount of power supplied from the grid. The second target received power may be a value instructed by the HEMS 200 described later. Alternatively, the second target received power may be known.

  Here, the charge / discharge amount is a term indicating a charge amount and a discharge amount. The larger the charge / discharge amount, the smaller the charge amount and the greater the discharge amount. In other words, the smaller the charge / discharge amount, the larger the charge amount and the smaller the discharge amount.

  The fuel cell unit 150 is connected to the power line at the connection point P3, and includes a fuel cell 151 and a PCS 152. The fuel cell 151 is an example of a distributed power source, and is a device that outputs 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 fuel cell unit 150 operates by load following control. Specifically, the fuel cell unit 150 sets the fuel cell 151 so that the power output from the fuel cell 151 follows the current value detected by the ammeter 181 based on the current value detected by the ammeter 181. Control. In other words, the fuel cell 151 operates so that the value detected by the ammeter 181 approaches the first target received power.

  The first target received power is a target value for the amount of power supplied from the grid. The first target received power may be a value instructed by the HEMS 200 described later. Alternatively, the first target received power may be known. It should be noted that the first target received power is smaller than the second target received power.

  The hot water storage unit 160 is an example of a heat storage device that converts electric power into heat, accumulates heat, 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 HEMS 200 controls the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the hot water storage unit 160. Specifically, the HEMS 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. Further, the HEMS 200 may control the power consumption of the load 120 by controlling the operation mode of the load 120.

  However, it should be noted that in the first embodiment, the HEMS 200 is not an essential configuration and the HEMS 200 may not be provided.

  For example, as illustrated in FIG. 3, the HEMS 200 includes a reception unit 210, a transmission unit 220, and a control unit 230.

  The receiving unit 210 receives various signals from a device connected via a signal line. For example, the receiving unit 210 receives information indicating the power generation amount of the PV 131 from the PV unit 130. The receiving unit 210 receives information indicating the storage amount of the storage battery 141 from the storage battery unit 140. The receiving unit 210 receives information indicating the power generation amount of the fuel cell 151 from the fuel cell unit 150. The receiving unit 210 receives information indicating the amount of hot water stored in the hot water storage unit 160 from the hot water storage unit 160.

  The transmission unit 220 transmits various signals to a device connected via a signal line. For example, the transmission part 220 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.

  The control unit 230 controls the load 120, the PV unit 130, the storage battery unit 140, the fuel cell unit 150, and the hot water storage unit 160.

  In the first embodiment, the control unit 230 may have a function of setting the first target received power and the second target received power. Further, the control unit 230 may have a function of instructing the fuel cell unit 150 with the first target received power and instructing the storage battery unit 140 with the second target received power.

(Energy management method)
Hereinafter, an energy management method according to the first embodiment will be described. FIG. 4 is a flowchart for explaining the energy management method according to the first embodiment. It should be noted that the operation shown in FIG. 4 is repeated at a predetermined control period.

  As shown in step 10 of FIG. 4, depending on whether the power consumption of the devices (here, the load 120 and the storage battery unit 140) provided downstream of the ammeter 181 has reached the rated power of the fuel cell 151. The subsequent processing changes. When the determination result is “YES”, that is, when the power consumption does not reach the rated power, the process of step 20 is performed. On the other hand, when the determination result is “NO”, that is, when the power consumption reaches the rated power, the process of step 40 is performed.

  In step 20, the fuel cell 151 increases the output power of the fuel cell 151. Specifically, the first target power reception amount is smaller than the second target power reception amount. Therefore, the fuel cell 151 consumes the devices (here, the load 120 and the storage battery unit 140) provided downstream from the ammeter 181 in order to bring the value detected by the ammeter 181 closer to the first target received power. Power must be output in excess of power.

  However, when the output power of the fuel cell 151 reaches the rated power of the fuel cell 151, the fuel cell 151 maintains the output power of the fuel cell 151 at the rated power.

  In step 30, the storage battery 141 decreases the charge / discharge amount of the storage battery 141. Specifically, since the fuel cell 151 outputs extra power, the value detected by the ammeter 182 increases. Therefore, the storage battery 141 needs to reduce the charge / discharge amount of the storage battery 141 in order to bring the received power at the place where the ammeter 181 is provided closer to the second target received power. As mentioned above, it should be noted that the received power at the location where the ammeter 181 is provided is specified using the value detected by the ammeter 182. That is, the storage battery 141 is charged.

  By repeating the processing of step 20 and step 30, the output power of the fuel cell 151 increases until the rated power of the fuel cell 151 is reached. In addition, the storage battery 141 is charged.

  In step 40, the fuel cell 151 consumes a large amount of power in a device (here, mainly the load 120) provided downstream from the ammeter 181, so that the output power of the fuel cell 151 reaches the rated power of the fuel cell 151. If not, the output power of the fuel cell 151 is increased. However, when the output power of the fuel cell 151 reaches the rated power of the fuel cell 151, the fuel cell 151 maintains the output power of the fuel cell 151 at the rated power.

  In step 50, the storage battery 141 increases the charge / discharge amount of the storage battery 141. Specifically, since the power consumption of the device (here, the load 120) provided downstream of the ammeter 182 cannot be covered by the output power of the fuel cell 151, the value detected by the ammeter 182 increases. . Therefore, the storage battery 141 needs to increase the charge / discharge amount of the storage battery 141 in order to bring the received power at the location where the ammeter 181 is provided closer to the second target received power. As mentioned above, it should be noted that the received power at the location where the ammeter 181 is provided is specified using the value detected by the ammeter 182. That is, the storage battery 141 is discharged.

(Function and effect)
In the first embodiment, the first target power reception amount used for load follow-up control of the fuel cell 151 is smaller than the second target power reception amount used for charge / discharge control of the storage battery 141. Accordingly, the output power of the fuel cell 151 increases due to the difference between the first target power reception amount and the second target power reception amount. When the output power of the fuel cell 151 increases, the charge / discharge amount of the storage battery 141 decreases. When the power consumption of equipment (mainly the load 120) provided downstream of the ammeter 181 is smaller than the rated power of the fuel cell 151, the above operation is repeated, so that the output power of the fuel cell 151 is reduced. It rises and the storage battery 141 is charged. On the other hand, when the power consumption of equipment (mainly the load 120) provided downstream from the ammeter 181 is larger than the rated power of the fuel cell 151, the power consumption cannot be covered by the output power of the fuel cell 151. Then, the storage battery 141 is discharged.

  Thus, even if the storage battery 141 does not know the rated power and the maximum output power of the fuel cell 151, charging / discharging of the storage battery 141 is appropriately controlled.

  In the first embodiment, the ammeter 181 is provided on the side closer to the system than the connection point between the storage battery 141 and the power line and the connection point between the fuel cell 151 and the power line, so that the fuel cell 151 is controlled. The control power, the power stored in the storage battery 141, and the control power for controlling the storage battery 141 are considered in the load following control.

[Modification 1]
Hereinafter, Modification Example 1 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  Specifically, in the first modification, the position where the ammeter 182 is provided is different from the first embodiment. In the first modification, as shown in FIG. 5, the ammeter 182 is provided upstream of the connection point P2 between the storage battery unit 140 and the power line and the connection point P3 between the fuel cell unit 150 and the power line (side closer to the system). It is done. That is, the ammeter 182 is provided at the same position as the ammeter 181.

  Thus, since the position of the ammeter 182 is different from that of the first embodiment, the charge / discharge control of the storage battery 141 is also different from that of the first embodiment.

  Specifically, when the second target received power is “X”, the value detected by the ammeter 182 is “Y”, and the change amount of the charge / discharge amount in the predetermined control cycle is “ΔC”. The change amount ΔC of the charge / discharge amount is controlled so as to satisfy “ΔC = Y−X”.

  That is, the storage battery 141 controls the amount of change in the charge / discharge amount of the storage battery 141 so that the value detected by the ammeter 182 becomes the second target received power. In the first modification, charging / discharging of the storage battery 141 is thus performed while causing a time lag (predetermined control cycle).

  However, the same control as in the first embodiment is performed except that a time lag occurs. Therefore, also in the first modification, even if the storage battery 141 does not know the rated power and the maximum output power of the fuel cell 151, charging / discharging of the storage battery 141 is appropriately controlled.

[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.

  In the embodiment, the customer 10 includes 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 only needs to have at least one of the storage battery unit 140 and the fuel cell unit 150.

  In the embodiment, the fuel cell unit 150 is exemplified as the distributed power source. However, the embodiment is not limited to this. The distributed power supply may be a power supply that operates by load following control.

  In the second modification, the case where the ammeter 181 and the ammeter 182 are provided is illustrated. However, since the ammeter 181 and the ammeter 182 are provided at the same position, the ammeter used for load follow-up control and the ammeter used for charge / discharge control may be one ammeter. In other words, the first ammeter and the second ammeter may be the same ammeter.

  Although not particularly mentioned in the embodiment, the ammeter 182 may be provided downstream (on the side away from the system) from the connection point P3 between the fuel cell unit 150 and the power line. However, the ammeter 182 is provided upstream (side closer to the system) than the connection point P4 between the load 120 and the power line.

  DESCRIPTION OF SYMBOLS 10 ... Consumer, 20 ... CEMS, 30 ... Substation, 31 ... Distribution line, 40 ... Smart server, 50 ... Power plant, 51 ... Transmission line, 60 ... Network, 100 ... Energy management system, 110 ... Distribution board, DESCRIPTION OF SYMBOLS 120 ... Load, 130 ... PV unit, 131 ... PV, 132 ... PCS, 140 ... Storage battery unit, 141 ... Storage battery, 142 ... PCS, 150 ... Fuel cell unit, 151 ... Fuel cell, 152 ... PCS, 160 ... Hot water storage unit, 181, 182 ... Ammeter, 200 ... HEMS, 210 ... Receiving unit, 220 ... Transmitting unit, 230 ... Control unit

Claims (4)

An energy management system comprising a distributed power source and a power storage device,
On the power line connecting the distributed power source and the power storage device and the system, a first ammeter used for load follow-up control of the distributed power source and a second ammeter used for charge / discharge control of the power storage device are provided,
The first ammeter is provided on a side closer to the system than a connection point between the power storage device and the power line and a connection point between the distributed power source and the power line,
The distributed power supply operates so that a value detected by the first ammeter approaches a first target power reception amount,
The power storage device operates using a value detected by the second ammeter so that the amount of power received at a location where the first ammeter is provided approaches a second target power reception amount,
The energy management system according to claim 1, wherein the first target power reception amount is smaller than the second target power reception amount. The second ammeter is provided on a side farther from the system than a connection point between the power storage device and the power line and closer to the system than a connection point between the distributed power source and the power line. ,
The power storage device uses the value detected by the second ammeter to charge the power storage device so that the amount of power received at the location where the first ammeter is provided becomes the second target power reception amount. The energy management system according to claim 1, wherein a discharge amount is controlled. The second ammeter is provided on a side closer to the system than a connection point between the power storage device and the power line and a connection point between the distributed power source and the power line,
2. The storage device according to claim 1, wherein the storage device controls a change amount of a charge / discharge amount of the storage device so that a value detected by the second ammeter becomes a second target power reception amount. 3. Energy management system. An energy management method used in an energy management system including a distributed power source and a power storage device,
On a power line connecting the distributed power source and the power storage device and the system, a connection point between the power storage device and the power line and a connection point between the distributed power source and the power line for use in load following control of the distributed power source A first current measurement step of detecting a current closer to the system than
A second current measurement step of detecting a current for use in charge / discharge control of the power storage device;
Operating the distributed power supply so that a value detected by the first current detection step approaches a first target power reception amount;
The power storage device operates such that the value detected by the second current detection step approaches the second target power reception amount,
The energy management method according to claim 1, wherein the first target power reception amount is smaller than the second target power reception amount.

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