JP2013207936A - Energy management system, energy management method, and distributed power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system capable of appropriately using electric power output from a distributed power source, and to provide an energy management method and distributed power source used therefor.SOLUTION: A control section 230 applies a first control mode for calculating target power from a value detected by an ammeter 181 or a second control mode for calculating target power from a value detected by an ammeter 182 as load follow-up control of a fuel cell unit 150.

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 and a distributed power source 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 source is controlled so that the power output from the distributed power source follows the value (target power) detected by an ammeter provided on the power line connecting the system and the distributed power source (load). Follow-up control).

  In such a case, the ammeter used for controlling the distributed power source in order to store the power supplied from the system in the power storage device at night when the unit price of power supplied from the system is low, the power storage device and the power line It is provided in the downstream (side away from the system) from the connection point. As a result, the power stored in the power storage device is not added to the target power for load follow-up control of the distributed power supply. Therefore, when the power storage device performs power storage, not the power output from the distributed power supply but the power supplied from the grid is stored in the power storage device.

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

  However, if the ammeter used for controlling the distributed power source is provided downstream (away from the grid) from the connection point between the power storage device and the power line, the unit price of power supplied from the grid is high in the daytime. In such a case, the control power for controlling the power storage device is not added to the target power for load follow-up control of the distributed power source. Therefore, even if the power storage device is controlled so that the power storage device is not stored in such a time zone (for example, daytime), the control power for controlling the power storage device is not the power output from the distributed power source. There is no power supplied from the grid by the power storage device.

  Thus, depending on the unit price of power supplied from the grid, the power output from the distributed power source is not properly supplied to the power storage device, and the power output from the distributed power source cannot be used appropriately. Further, in the distributed power supply, the output is often suppressed to a low level, and the power generation efficiency is also lowered.

  Therefore, the present invention has been made to solve the above-described problems, and provides an energy management system, an energy management method, and a distributed power source that can appropriately use the power output from the distributed power source. With the goal.

  The energy management system according to the first feature includes a distributed power source and a power storage device. A first ammeter and a second ammeter used for load follow-up control of the distributed power supply are provided on a power line connecting the distributed power supply and the power storage device to the system. The first 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 second ammeter is provided closer to the system than a connection point between the power storage device and the power line. The energy management system uses the value detected by the first ammeter as the load following control in a first control mode for calculating a target power of the load following control, or detected by the second ammeter The control part which applies the 2nd control mode which calculates the target electric power of the said load following control using a value is provided.

  In the first feature, the control unit applies the second control mode as load follow-up control of the distributed power source when the unit price of power generation of the distributed power source is lower than the unit price of power supplied from the system. To do.

  In the first feature, the control unit applies the first control mode as load follow-up control of the distributed power source when the unit price of power generation of the distributed power source is higher than the unit price of power supplied from the grid. To do.

  1st characteristic WHEREIN: Even if it is a case where the power generation unit price of the said distributed power supply is higher than the unit price of the electric power supplied from the said system, the said control part, when the waste heat efficiency of the said distributed power source is high, The second control mode is applied as the load following control, and the first control mode is applied as the load following control when the exhaust heat efficiency of the distributed power source is low.

  In the first feature, the energy management system further includes a hot water storage device that uses exhaust heat of the distributed power source. The control unit determines that the exhaust heat efficiency of the distributed power source is high when the hot water storage amount of the hot water storage device is less than a threshold value or when the hot water temperature is lower than a predetermined temperature.

  In the first feature, the distributed power source is a fuel cell.

  In the first feature, the energy management system further includes a solar power generation device. The solar power generation device is connected to a side closer to the system than the second ammeter on the power line.

  The energy management method according to the second feature is a method used in an energy management system including a distributed power source and a power storage device. The energy management method detects a current 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. Current detection step, a second current measurement step of detecting a current closer to the system than a connection point between the power storage device and the power line, and load follow-up control of the distributed power source. The target power for the load following control is calculated using the first control mode for calculating the target power for the load following control using the value detected by the step, or the value detected by the second current detecting step. Applying the second control mode.

  The distributed power source according to the third feature is connected to an energy management system including a power storage device, and performs load following control. On the power line connecting the distributed power source and the power storage device and the system, on the side farther from the system than the connection point between the power storage device and the power line, and more than the connection point between the distributed power source and the power line A first ammeter is provided on a side closer to the system, and a second ammeter is provided on a side closer to the system than a connection point between the power storage device and the power line. The distributed power source is a first control mode for calculating a target power of the load following control using the value detected by the first ammeter as the load following control, or a value detected by the second ammeter. The control part which applies the 2nd control mode which calculates the target electric power of the said load follow-up control using is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the energy management system, the energy management method, and distributed power supply which enable it to use appropriately the electric power output from a distributed power supply can be provided.

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.

  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 and a second ammeter used for load follow-up control of the distributed power supply are provided on a power line connecting the distributed power supply and the power storage device to the system. The first 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 second ammeter is provided closer to the system than a connection point between the power storage device and the power line. The energy management system uses the value detected by the first ammeter as the load following control in a first control mode for calculating a target power of the load following control, or detected by the second ammeter The control part which applies the 2nd control mode which calculates the target electric power of the said load following control using a value is provided.

  In the embodiment, the control unit uses the first control mode to calculate the target power using the value detected by the first ammeter or the value detected by the second ammeter as load follow-up control of the distributed power supply. The second control mode for calculating the target power using is applied.

  Here, in the first control mode, the first ammeter used for load follow-up control of the distributed power source is provided downstream (on the side away from the system) from the connection point between the power storage device and the power line. The accumulated power is not added to the target power for load following control. When the power storage device performs power storage, not the power output from the distributed power supply but the power supplied from the grid is stored in the power storage device.

  On the other hand, in the second control mode, the second ammeter used for load follow-up control of the distributed power supply is provided upstream (side closer to the system) than the connection point between the power storage device and the power line, so the power storage device is controlled. The control power for doing this is added to the target power for load following control. Therefore, the control power for controlling the power storage device is covered by the power output from the distributed power supply, not the power supplied from the grid.

  As described above, as the load follow-up control of the distributed power source, the power output from the distributed power source can be appropriately used by properly using the first control mode and the second control mode.

[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, and are used for load following control of the fuel cell unit 150.

  The ammeter 181 is on the power line connecting the storage battery unit 140 and the fuel cell unit 150 to the system, downstream of the connection point P2 between the storage battery unit 140 and the power line (the side away from the system), and the fuel cell unit 150. And upstream of the connection point P3 between the power line and the power line. On the other hand, the ammeter 182 is provided upstream (side closer to the system) than the connection point P2 between the storage battery unit 140 and the power line.

  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 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 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 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 controls the fuel cell 151 so that the power output from the fuel cell 151 becomes the target power for load following control. In other words, the fuel cell unit 150 controls the power output from the fuel cell 151 so that the current value detected by the ammeter 181 or the ammeter 182 becomes the target received power.

  Here, the target power is a target value of power to be output from the fuel cell 151. On the other hand, the target received power is a target value of power to be detected by the ammeter 181 or the ammeter 182.

  In the first embodiment, there is a first control mode in which the value detected by the ammeter 181 is used as the target power as the load following control, or a second control mode in which the value detected by the ammeter 182 is used as the target power. To do.

  For example, the fuel cell unit 150 performs load following control according to the control mode instructed from the HEMS 200. The HEMS 200 may notify the fuel cell unit 150 of a control signal indicating a control mode to be applied (first control mode or second control mode). Alternatively, the HEMS 200 may notify the fuel cell unit 150 of a control signal indicating an offset to be applied.

  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.

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

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

  Specifically, 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.

  In the first embodiment, the reception unit 210 may receive energy charge information, energy consumption prediction information, and PV power generation amount prediction information from various servers via the network 60. However, the energy fee information, the energy consumption prediction information, and the PV power generation amount prediction information may be stored in the HEMS 200 in advance.

  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 applies the above-described first control mode or second control mode as load follow-up control of the fuel cell unit 150.

  Specifically, the control unit 230 applies the second control mode as the load following control of the fuel cell unit 150 when the power generation unit price of the fuel cell unit 150 is lower than the unit price of power supplied from the grid. . For example, the control unit 230 applies the second control mode as load follow-up control of the fuel cell unit 150 in the daytime when the purchase unit price of power supplied from the grid is high.

  On the other hand, the control unit 230 applies the first control mode as the load following control of the fuel cell unit 150 when the power generation unit price of the fuel cell unit 150 is higher than the unit price of power supplied from the grid. For example, the control unit 230 applies the first control mode as the load following control of the fuel cell unit 150 at night or the like when the unit price of power supplied from the grid is low.

  The control unit 230 instructs the fuel cell unit 150 about a control mode to be applied as load following control. An instruction indicating a control mode to be applied as load following control is transmitted from the transmission unit 220 described above to the fuel cell unit 150.

  The power generation unit price of the fuel cell unit 150 is determined based on the fuel gas supplied to the fuel cell unit 150 and the rate at which the fuel gas is converted into electric power (power conversion rate). The power conversion rate may be known to the control unit 230 or may be notified from the fuel cell unit 150 to the control unit 230. Moreover, you may consider the efficiency (exhaust heat collection | recovery efficiency) which collect | recovers the exhaust heat generated by an electric power generation by warming the water supplied from a hot water tank.

  As described above, in the first control mode, the power value calculated from the value detected by the ammeter 181 provided downstream (on the side away from the grid) from the connection point P2 between the storage battery unit 140 and the power line is the target. Used as electric power. That is, in the first control mode, the fuel cell 151 is configured such that the power output from the fuel cell 151 follows the power consumption (target power) of the device provided downstream (away from the grid) from the ammeter 181. Is controlled. In other words, the power output from the fuel cell 151 follows the power consumption of the load 120.

  On the other hand, in the second control mode, the power value calculated from the value detected by the ammeter 182 provided upstream (side closer to the grid) than the connection point P2 between the storage battery unit 140 and the power line is used as the target power. It is done. That is, in the second control mode, the fuel cell 151 is configured such that the power output from the fuel cell 151 follows the power consumption (target power) of the device provided downstream (away from the grid) from the ammeter 182. Is controlled. In other words, the power output from the fuel cell 151 follows the total power consumption of the load 120 and the fuel cell unit 150.

(Energy management method)
Hereinafter, an energy management method according to the first embodiment will be described. FIG. 4 is a flowchart showing the energy management method according to the first embodiment. Specifically, FIG. 4 is a flowchart showing the operation of the HEMS 200.

  As shown in FIG. 4, in step 10, the HEMS 200 acquires energy fee information. Here, the HEMS 200 may acquire energy charge information via the network 60. Alternatively, the energy fee information may be stored in advance in the HEMS 200.

  In step 20, the HEMS 200 determines whether the power generation unit price of the fuel cell unit 150 is lower than the purchase unit price of power supplied from the grid. When the determination result is “YES”, the HEMS 200 proceeds to the process of step 30. On the other hand, if the determination result is “NO”, the HEMS 200 proceeds to the process of step 40.

  In step 30, the HEMS 200 applies the second control mode as the load following control of the fuel cell unit 150.

In step 40, the HEMS 200 applies the first control mode as the load following control of the fuel cell unit 150.

As described above, in the first embodiment, the control unit 230 uses the power value calculated from the value detected by the ammeter 181 as the target power as the load follow-up control of the fuel cell unit 150. Alternatively, the second control mode in which the power value calculated from the value detected by the ammeter 182 is used as the target power is applied.

  Here, in the first control mode, the ammeter 181 used for load following control of the fuel cell unit 150 is provided downstream (on the side away from the system) from the connection point between the storage battery unit 140 and the power line. The electric power stored in the unit 140 is not taken into account for the target electric power for the load following control. When storing the storage battery unit 140, not the power output from the fuel cell unit 150 but the power supplied from the grid is stored in the storage battery unit 140.

  On the other hand, in the second control mode, the ammeter 182 used for load follow-up control of the fuel cell unit 150 is provided upstream (side closer to the system) than the connection point between the storage battery unit 140 and the power line. The electric power stored in 140 is added to the target electric power for load following control. Therefore, the control power for controlling the storage battery unit 140 is covered by the power output from the fuel cell unit 150, not the power supplied from the grid.

  As described above, as the load follow-up control of the fuel cell unit 150, the power output from the fuel cell unit 150 can be appropriately used by properly using the first control mode and the second control mode.

  In the first embodiment, the ammeter 181 and the ammeter 182 are provided upstream (side closer to the system) than the connection point P3 between the fuel cell unit 150 and the power line. In other words, the control power for controlling the fuel cell unit 150 is added to the target power for load following control. Therefore, the control power for controlling the fuel cell unit 150 is covered by the power output from the fuel cell unit 150.

[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 case where the control unit is provided in the HEMS 200 is illustrated. However, the embodiment is not limited to this. The control unit may be a PCS 152 provided in the fuel cell unit 150. Alternatively, the control unit may be provided in the CEMS 20 or may be provided in the smart server 40. Alternatively, the control unit may be provided in a BEMS (Building Energy Management System), or may be provided in a FEMS (Factory Energy Management System).

  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 embodiment, the first control mode or the second control mode is applied based on the comparison result between the purchase unit price of power supplied from the grid and the power generation unit price of the fuel cell unit 150. However, the embodiment is not limited to this. For example, the first control mode or the second control mode may be applied based on the energy consumption prediction information. Alternatively, the first control mode or the second control mode may be applied based on the PV power generation amount prediction information.

  In the first embodiment, the control unit 230 applies the first control mode for calculating the target power without adding an offset if the purchase unit price is lower than the power generation unit price as load follow-up control of the fuel cell unit 150. When the purchase unit price is higher than the power generation unit price, an example is shown in which the second control mode in which the target power is calculated by adding the offset is applied. However, the embodiment is not limited to this. For example, not only the unit price, but also the efficiency (waste heat recovery efficiency) of collecting water by warming the water by exhaust heat generated by power generation and supplying it as hot water to the hot water storage tank may be considered. That is, when the amount of stored hot water is small or the hot water temperature is low, the exhaust heat recovery is further promoted and the exhaust heat recovery rate is increased. Therefore, even if the power generation unit price is slightly higher than the purchase unit price, the second There may be cases where the control mode is set. Specifically, in step S20 of FIG. 4, when the power generation unit price is higher than the purchase unit price, it is shown that the first control mode is adopted immediately after proceeding to step 40, but the amount of stored hot water is less than a certain threshold value. Alternatively, when the hot water temperature is lower than the predetermined temperature, the second control mode may be applied until the hot water storage amount exceeds the threshold value or the hot water temperature exceeds the predetermined temperature.

  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, 200 ... HEMS, 210 ... receiving unit, 220 ... transmitting unit, 230 ... control unit

Claims (9)

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 and a second ammeter used for load follow-up control of the distributed power source are provided,
The first 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 second ammeter is provided closer to the system than a connection point between the power storage device and the power line,
As the load follow-up control, the first control mode for calculating the target power of the load follow-up control using the value detected by the first ammeter, or the value detected by the second ammeter An energy management system comprising a control unit that applies a second control mode for calculating target power for load following control.   The control unit applies the second control mode as load follow-up control of the distributed power source when the unit price of power generation of the distributed power source is lower than the unit price of power supplied from the system. The energy management system according to claim 1.   The control unit applies the first control mode as load follow-up control of the distributed power source when the unit price of power generation of the distributed power source is higher than the unit price of power supplied from the grid. The energy management system according to claim 1 or 2.   Even when the unit price of power generation of the distributed power source is higher than the unit price of power supplied from the system, the control unit is configured as the load following control when the exhaust heat efficiency of the distributed power source is high. 3. The energy management system according to claim 1, wherein the first control mode is applied as the load following control when the two control mode is applied and the exhaust heat efficiency of the distributed power source is low. It further comprises a hot water storage device that uses the exhaust heat of the distributed power source,
The said control part determines with the exhaust heat efficiency of the said distributed power supply being high, when the amount of hot water storage of the said hot water storage apparatus is less than a threshold value, or hot water temperature is lower than predetermined temperature, The said heat source is determined. Energy management system.   The energy management system according to claim 1, wherein the distributed power source is a fuel cell. A solar power generation device,
The energy management system according to any one of claims 1 to 6, wherein the solar power generation device is connected to a side closer to the system than the second ammeter on the power line. An energy management method used in an energy management system including a distributed power source and a power storage device,
A first current detection step of detecting a current 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; ,
A second current measurement step of detecting a current closer to the system than a connection point between the power storage device and the power line;
As load follow-up control of the distributed power source, a first control mode for calculating a target power of the load follow-up control using a value detected in the first current detection step, or detected by the second current detection step Applying a second control mode that calculates a target electric power for the load following control using a value, and an energy management method. A distributed power source connected to an energy management system including a power storage device and performing load following control,
On the power line connecting the distributed power source and the power storage device and the system, on the side farther from the system than the connection point between the power storage device and the power line, and more than the connection point between the distributed power source and the power line A first ammeter is provided on a side closer to the system, a second ammeter is provided on a side closer to the system than a connection point between the power storage device and the power line,
As the load follow-up control, the first control mode for calculating the target power of the load follow-up control using the value detected by the first ammeter, or the value detected by the second ammeter A distributed power supply comprising a control unit that applies a second control mode for calculating a target power for load following control.

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