WO2015104787A1

WO2015104787A1 - Energy management device and energy management system

Info

Publication number: WO2015104787A1
Application number: PCT/JP2014/006492
Authority: WO
Inventors: 義隆手塚; 賢二中北; 新平日比谷
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2014-01-08
Filing date: 2014-12-26
Publication date: 2015-07-16
Also published as: JP2015130768A

Abstract

The purpose of the present invention is to provide an energy management device capable of considering the power generation capability of a cogeneration device depending on the amount of stored hot-water and accurately notifying the user of information regarding the power that can be supplied to loads, and also provide an energy management system. The energy management device (81) comprises a time calculation unit (81c) and a power supply information generation unit (81d). The time calculation unit (81c) derives, based on the amount of stored hot-water of a fuel cell (63), power generation possible time during which the fuel cell (63) can continue to generate power. The power supply information generation unit (81d) generates, based on the stored power of a storage battery (62), the power generation possible time of the fuel cell (63), and the power consumption of specific loads (80), power supply information regarding the power that can be supplied to the specific loads (80) by using the storage battery (62) and the fuel cell (63), and outputs the power supply information to a display terminal (82).

Description

Energy management device and energy management system

The present invention generally relates to an energy management device and an energy management system, and more particularly to an energy management device and an energy management system that manage a combination of a storage battery and a cogeneration device.

Conventionally, a power supply system having a backup function for supplying power during a power failure using a storage battery and a distributed power source (solar cell, fuel cell, etc.) has been provided. And in this kind of system, the structure which alert | reports the dischargeable time of a storage battery is proposed based on the electrical storage power of a storage battery, the generated power of a distributed power supply, and the power consumption of a load (for example, international publication number 2011/142330). reference).

As a distributed power source used by a power supply system, there is a cogeneration device that generates hot water from water using exhaust heat generated during power generation operation. The cogeneration apparatus stores hot water generated during a power generation operation in a hot water storage tank, and a user can use the hot water in the hot water storage tank.

During the power outage, the load is supplied using the stored power of the storage battery and the generated power of the cogeneration system. And the energy management apparatus which manages the electric power supply to load produced | generated the information regarding the electric power supply at the time of a power failure, and alert | reported to the user.

Generally, the cogeneration system stops power generation when the amount of hot water storage is full. However, the conventional energy management device does not consider the power generation capability of the cogeneration device depending on the amount of stored hot water. Therefore, the accuracy of information regarding power supply at the time of a power failure is low, and it is difficult for the user to properly adjust the operation of the load during the power failure period, for example, at a timing when power supply to the load during the power failure period is not intended. There was a situation of stopping.

The present invention has been made in view of the above reasons, and its purpose is to consider the power generation capability of the cogeneration device depending on the amount of stored hot water, and an energy management device capable of accurately reporting information on the power that can be supplied to the load, And to provide an energy management system.

The energy management device of the present invention is a load using a storage battery and a cogeneration device that generates hot water from water during power generation and stops the power generation when the amount of hot water stored in the hot water storage tank that stores the generated hot water exceeds a predetermined amount. An energy management device for managing power supply to the information acquisition unit for acquiring information on power consumption of the load, stored power of the storage battery, and hot water storage amount of the hot water storage tank, and hot water storage amount of the hot water storage tank A time calculation unit for deriving a power generation possible time during which the cogeneration device can continue power generation, and the storage battery based on the stored power of the storage battery, the power generation possible time of the cogeneration device, and the power consumption of the load. Using the cogeneration apparatus, power supply information relating to power that can be supplied to the load is generated, and the power supply information is output to the notification unit Characterized in that it comprises a feeding information generating unit that.

The energy management system of the present invention includes a storage battery, a cogeneration device that generates hot water from water during power generation and stores the generated hot water when a hot water storage amount of the hot water storage tank exceeds a predetermined amount, and the storage battery. An energy management device that manages power supply to a load using the cogeneration device and generates power supply information related to power that can be supplied to the load, and a notification unit that notifies the power supply information generated by the energy management device The energy management device includes an information acquisition unit that acquires information on power consumption of the load, stored power of the storage battery, and hot water storage amount of the hot water storage tank, and the code based on the hot water storage amount of the hot water storage tank. A time calculation unit for deriving a power generation possible time during which the generation device can continue power generation, the stored power of the storage battery, and the cogeneration system The power generation time of the Deployment apparatus, generates the feed information based on the power consumption of the load, characterized in that it comprises a feeding information generating unit that outputs the power supply information to the notifying unit.

The present invention has an effect of accurately reporting information on the power that can be supplied to the load in consideration of the power generation capability of the cogeneration device depending on the amount of hot water stored in the hot water storage tank.

It is a block diagram which shows the outline of the energy management system using the energy management apparatus of embodiment. It is a lineblock diagram showing the whole energy management system composition of an embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
The overall configuration of the energy management system (power management system) is shown in FIG. The energy management system includes a distribution board 10, a self-supporting distribution board 20, a power switch 30, a measuring device 40, a power conversion device 50, a storage battery 62, a fuel cell 63, an energy management device 81, and a display terminal 82 as main components. .

First, the power supply system includes four types of power sources 61, storage batteries 62, fuel cells 63, and solar cells 64 as power sources for supplying power to the load.

The system power supply 61 is a commercial power supply supplied from a power supply company such as an electric power company through a distribution network.

The storage battery 62 is composed of a lithium ion battery or the like.

The fuel cell 63 is a cogeneration apparatus that uses hydrogen gas generated by reforming a fuel gas containing methane or propane, and a hot water storage tank 632 is attached to the power generation unit 631 (see FIG. 2). The power generation unit 631 generates power using the fuel cell unit, and further generates hot water from water using exhaust heat generated during the power generation operation. The hot water storage tank 632 stores hot water generated from water during the power generation operation of the power generation unit 631. Then, the fuel cell 63 stops the power generation by the power generation unit 631 when the amount of hot water stored in the hot water storage tank 632 exceeds a predetermined amount.

That is, the fuel cell 63 has both functions of power generation and water heating. Further, the fuel cell 63 includes an auxiliary heat source that performs additional heating when the amount of heat stored as hot water in the hot water storage tank 632 is insufficient. Further, the fuel cell 63 may include an auxiliary heat source that is used when the hot water stored in the hot water storage tank 632 is replenished. The fuel cell 63 can communicate with a remote controller 63 a used for managing the operating state of the fuel cell 63.

The solar cell 64 generates power by sunlight.

In the present embodiment, the solar cell 64 is illustrated as a power source capable of reverse power flow to the system power source 61. However, the solar cell 64 is a power source that generates power using natural energy such as wind power, hydropower, and geothermal heat. Can be substituted. In the present embodiment, the storage battery 62 and the fuel cell 63 are illustrated as power supplies that do not perform reverse power flow to the system power supply 61. Further, instead of the fuel cell 63, it is also possible to use a cogeneration device that generates power using a gas engine (gas micro turbine).

Distribution line L1 connected to system power supply 61 is connected to distribution board 10 (see FIG. 2).

The distribution board 10 has a main body breaker 11 having a primary side connected to the distribution line L1 and a plurality of branch breakers 12 for branching power on the secondary side of the main circuit breaker 11 incorporated in the casing. Each branch breaker 12 supplies power to the load 70 through the branch line L2. In FIG. 2, a plurality of loads 70 are collectively denoted by reference numerals, but the reference numerals 70 indicate individual loads.

Furthermore, the distribution board 10 incorporates an interconnection breaker 13 and a current sensor X3. The interconnection breaker 13 is connected to the primary circuit (distribution line L1) of the main breaker 11, and is inserted between the power converter 50 and the distribution line L1. The interconnection breaker 13 forms a path for supplying the power generated by the solar battery 64 to the primary circuit of the main breaker 11 and forms a path for using the power received from the system power supply 61 for charging the storage battery 62. . The interconnection breaker 13 is a so-called remote control breaker, and is switched on / off according to an instruction from the power conversion device 50.

The current sensor X3 is arranged so as to detect a current passing through the main breaker 11. In the example of FIG. 2, the current sensor X <b> 3 is arranged in the distribution line L <b> 1 so as to measure the current passing through the electrical path between the connection point with the interconnection breaker 13 and the main breaker 11. The current sensor X3 is arranged so as to individually detect currents of two voltage lines (U phase and W phase) of the single phase three wires.

The current sensor X3 assumes a current transformer having a core as a specific configuration, but may be configured to use a coreless coil (so-called Rogowski coil) or a magnetic sensor. The same applies to the current sensors X1, X2, X4 to X7 described below, and the specific configuration of each of the current sensors X1, X2, X4 to X7 conforms to the configuration of the current sensor X3.

One of the plurality of branch breakers 12 built in the distribution board 10 is connected to the independent distribution board 20 through a branch line L3 corresponding to a single-phase three-wire. For the branch line L3, a power source switch for selecting one of the power supplied from the branch breaker 12 connected to the branch line L3 and the power supplied from the power converter 50 and supplying it to the independent distribution board 20 A container 30 is inserted. The power switch 30 includes an electromagnetic relay that conducts and cuts off the power supplied from the branch breaker 12 connected to the branch line L3 and the power supplied from the power converter 50.

The independent distribution board 20 supplies power to a load 80, a measuring device 40, a measuring point switching device (to be referred to as a switching device hereinafter) 90, which will be described later, and the like that require power supply even during a power failure period when power is not supplied from the system power supply 61. Form a pathway. In FIG. 2, a plurality of loads 80 are collectively indicated by a reference numeral 80, but the reference numeral 80 indicates an individual load. In addition, among the loads 80, the load 81 is an energy management device, and the load 82 is a display terminal (notification unit), which are hereinafter referred to as an energy management device 81 and a display terminal 82. In order to distinguish between the load 70 and the load 80, the load 70 is referred to as a “general load”, and the load 80 is referred to as a “specific load”. The specific load 80 includes an energy management device 81 and a display terminal 82. The energy management device 81 has a memory (recording medium) that can be read by a processor or a computer, and the function of the energy management device 81 is realized by the processor executing a program stored in the memory. . The program may be provided through a telecommunication line such as the Internet.

The self-supporting distribution board 20 includes a main body breaker 21 and a plurality of branch breakers 22 that branch power on the secondary side of the main circuit breaker 21 in a casing. The primary side of the main breaker 21 is connected to the power switch 30 and either one of the power supplied from the branch breaker 12 connected to the branch line L3 and the power supplied from the power converter 50 is used. Is supplied. Each branch breaker 22 supplies power to the specific load 80, the measuring device 40, and the switching device 90 through the branch line L4.

The specific load 80, the measuring device 40, and the switching device 90 can be operated by the power supplied from the distribution board 10 during the energization period in which the power is supplied from the system power supply 61. In addition, the specific load 80, the measuring device 40, and the switching device 90 can be operated by the power supplied from the power conversion device 50 during a power failure period in which power is not supplied from the system power supply 61.

Further, one branch breaker 22 among the plurality of branch breakers 22 is connected to the fuel cell 63 through the connection line L5. The power generated by the fuel cell 63 can be supplied to the specific load 80, the measuring device 40, and the switching device 90 via the connection line L5 and the independent distribution board 20. Moreover, since the electric power generated by the fuel cell 63 can be supplied to the distribution board 10 through the main breaker 21, the electric power can also be supplied from the fuel cell 63 to the general load 70.

The power converter 50 includes a storage battery 62 and a solar battery 64 connected to each other, and has a function of transferring power to and from the distribution board 10 and a function of supplying power to the independent distribution board 20. 51 (see FIG. 2). Furthermore, the power conversion device 50 includes a transformer 52 that converts the power output from the power converter 51 in two lines into three lines (see FIG. 2).

The power converter 51 converts the DC power generated by the solar battery 64 into AC power that can be connected to the system power supply 61. Further, the power converter 51 monitors and controls the charging current and discharging current of the storage battery 62, and converts the DC power discharged by the storage battery 62 into AC power.

Furthermore, the power converter 51 includes an interconnection terminal 55 connected to the interconnection breaker 13 and an independent output unit 56 that supplies electric power to the transformer 52. Then, the power converter 51 determines whether the system power supply 61 is energized or out of power (whether or not power can be received from the system power supply 61) using the voltage between the terminals of the interconnection terminal 55.

The interconnection terminal 55 is connected to the distribution line L <b> 1 via the interconnection breaker 13, and can be connected to the grid during the energization period of the grid power supply 61. Specifically, the interconnection terminal 55 is a single-phase three-wire system, is connected to the interconnection breaker 13 through the connection line L6, and the interconnection breaker 13 is connected to the distribution line L1 that is the primary side of the main breaker 11. Connected through.

The connection line L6 is a path for supplying AC power obtained from the generated power of the solar battery 64 or the stored power of the storage battery 62 to the main breaker 11 of the distribution board 10, or the generated power of the solar battery 64 is reversed to the distribution line L1. Used as a tidal path. Further, the connection line L6 is also used as a path for charging the storage battery 62 using electric power supplied from the system power supply 61 through the distribution line L1. The output voltage between the terminals of the interconnection terminal 55 is determined by the line voltage of the system power supply 61.

Of the power generated by the solar cell 64, surplus power that is not used by the customer is flowing backward to the distribution line L1, and the power converter 51 also has a function of monitoring and controlling the power flowing backward. The output of the current sensor X2 is input to the power converter 51. The power converter 51 determines whether or not a reverse power flow from the consumer to the system power supply 61 is generated based on the output of the current sensor X2, and the power flow is reversed. Judge power. Current sensor X2 is arranged to individually detect currents passing through two voltage lines in a single-phase three-wire.

The power converter 51 uses the relationship between the phase of the current monitored by the current sensor X2 and the phase of the voltage between the terminals of the interconnection terminal 55 to determine whether a reverse power flow from the customer to the system power supply 61 has occurred. Judging. The voltage between the terminals in the interconnection terminal 55 has the same voltage and the same phase as the line voltage of the distribution line L1 electrically connected to the interconnection terminal 55. Therefore, the power converter 51 uses the voltage waveform between the terminals of the interconnection terminal 55 and the current waveform monitored by the current sensor X2, and reverses the sign of an integrated value obtained by integrating the power for one period of the voltage waveform. Determine whether there is a tidal current.

In addition, the storage battery 62 does not perform reverse power flow to the system power supply 61. Therefore, the power converter 51 uses the output of the current sensor X2 in the same manner as described above in order to monitor whether or not the stored power of the storage battery 62 is flowing backward without being consumed by the consumer.

On the other hand, the self-supporting output unit 56 of the power converter 51 does not output power to the transformer 52 during the energization period of the system power supply 61 and outputs power to the transformer 52 during the power failure period of the system power supply 61. The self-supporting output unit 56 is a single-phase two-wire system, and is connected to the primary side of the transformer 52 by two wires, and only supplies power to the transformer 52. The voltage between the terminals of the self-supporting output unit 56 is kept at a constant voltage (for example, 200V). A self-supporting terminal 57 is provided on the secondary side of the transformer 52, and the power output from the self-supporting terminal 57 is derived from at least one of the solar battery 64 and the storage battery 62. The self-supporting terminal 57 is connected to the power switch 30 through a connection line L7 corresponding to a single-phase three-wire.

The power converter 51 determines whether the system power supply 61 is energized or is in a power failure using the voltage between the terminals of the interconnection terminal 55. Then, the power converter 51 controls the switching operation of the power switch 30 using the determination result of energization / power failure. The power switch 30 connects the connection line L3 to the main breaker 21 of the independent distribution board 20 and connects the connection line L7 to the main breaker 21 of the independent distribution board 20 according to an instruction from the power converter 51. Switch between states. That is, the self-standing distribution board 20 is supplied with power through the distribution board 10 while power is being supplied from the system power supply 61, and the power conversion device 50 during a power outage when the power from the system power supply 61 is stopped. Is supplied without passing through the distribution board 10. In addition, although the switching operation of the power switch 30 is performed by the contact signal which the power converter 51 outputs, for example, the signal form is not limited.

Further, the power converter 51 transmits the determination result (power failure information) of energization / power failure to the measuring device 40. Further, the power converter 51 transmits information on the storage battery 62 (accumulated power, discharge power, device information, error information, etc.) and information on the solar cell 64 (generated power, device information, error information, etc.) to the measuring device 40. To do.

In FIG. 2, the communication path between the power converter 51 and the measuring device 40 and the communication path between the power converter 51 and the storage battery 62 perform serial communication with specifications conforming to the RS485 standard, for example. It is not essential that the communication path conforms to the RS485 standard, and the communication path can also be realized by wireless communication or power line carrier communication using a wired communication path. Moreover, you may use combining these communication technologies.

Furthermore, the power conversion device 50 includes a switching instruction unit 53 that gives an instruction by a switching signal to the switching device 90. The switching instruction unit 53 gives a switching signal indicating energization / power failure to the switching device 90, and this switching signal is also transmitted to the fuel cell 63 through the switching device 90. In addition, this switching signal is a contact signal, for example, and the signal form is not limited.

The switching device 90 determines the current value monitored by the fuel cell 63 from either the current sensor X3 built in the distribution board 10 or the current sensor X5 that measures the current passing through the main breaker 21 of the independent distribution board 20. Select whether to get from. That is, the switching device 90 connects the current sensor X3 to the fuel cell 63 while the system power supply 61 is energized, and connects the current sensor X5 to the fuel cell 63 during the power failure period of the system power supply 61.

Since the fuel cell 63 does not perform reverse power flow in this embodiment, the fuel cell 63 determines whether or not reverse power flow has occurred based on the current monitored by the current sensors X3 and X5. That is, the fuel cell 63 uses each output of the current sensors X3 and X5 in order to monitor whether or not the generated power of the fuel cell 63 is flowing backward without being consumed by the consumer. Specifically, the fuel cell 63 uses the output of the current sensor X3 in order to detect a reverse power flow to the system power supply 61 when the system power supply 61 is energized. Further, the fuel cell 63 uses the output of the current sensor X5 in order to detect a reverse power flow to the connection line L7 at the time of a power failure of the system power supply 61.

In other words, the outputs of the current sensors X3 and X5 are input to the fuel cell 63 via the switching device 90, and the fuel cell 63 outputs all of the outputs from the fuel cell 63 based on the outputs of the current sensors X3 and X5. It is judged whether electric power is consumed by a consumer.

Further, the electric power generated by the fuel cell 63 is monitored by the current sensor X4. The current sensor X4 monitors the current passing through the connection line L5 that connects the fuel cell 63 and the branch breaker 22. The output of the current sensor X4 is input to the measuring device 40, and the measuring device 40 monitors the power passing through the connection line L5.

Further, the fuel cell 63 communicates with the power conversion device 50 through the switching device 90. That is, a switching signal indicating energization / power failure of the system power supply 61 is also notified from the power conversion device 50 to the fuel cell 63 through the switching device 90. Therefore, the fuel cell 63 can recognize which power is supplied from the interconnection terminal 55 or the self-supporting terminal 57 of the power conversion device 50.

Also, the power conversion device 50 communicates with the remote controller 54 in order to allow the user to instruct and monitor the operation.

In the customer, a current sensor X1 is arranged on the primary distribution line L1 of the main breaker 11 in order to measure the electric power received from the system power supply 61.

In the distribution line L1, a current sensor X2 is disposed between the current sensor X1 and the main breaker 11 in order to detect a reverse power flow to the system power supply 61. The current sensor X2 monitors the current at a position closer to the system power supply 61 than the connection point between the main breaker 11 and the interconnection breaker 13 in the distribution line L1.

Further, in the distribution line L1, the current sensor X3 is arranged so as to measure the current passing through the electric path between the connection point with the interconnection breaker 13 and the main breaker 11. The current sensor X4 monitors the current passing through the connection line L5 connecting the fuel cell 63 and the branch breaker 22, and the current sensor X5 measures the current passing through the main breaker 21 of the self-supporting distribution board 20. .

Also, the current sensor X6 is disposed on the branch line L2 and monitors the current supplied to the general load 70. The current sensor X7 is disposed on the branch line L4 and monitors the current supplied to the specific load 80.

And current sensor X1, X4, X6, X7 is connected to measuring device 40, and measuring device 40 acquires each current value which current sensor X1, X4, X6, X7 measured regularly.

The measuring device 40 measures the power received from the system power supply 61 based on the current value measured by the current sensor X1, and generates power purchase information (power purchase information, power sale information). Moreover, the measuring device 40 measures the power consumption of the general load 70 based on the current value measured by the current sensor X6, and generates power consumption information (general load). The measuring device 40 measures the power consumption of the specific load 80 based on the current value measured by the current sensor X7, and generates power consumption information (specific load).

In addition, the measurement device 40 communicates with the power conversion device 50 to thereby obtain information on the storage battery 62 (accumulated power, discharge power, device information, error information, etc.) and information on the solar cell 64 (generated power, device information, error information). Etc.), power outage information indicating the result of energization / power outage determination is acquired.

Also, the measuring device 40 measures the generated power of the fuel cell 63 based on the current value measured by the current sensor X4, and generates power generation information (fuel cell).

Then, the measuring device 40 uses the information on power trading, power consumption information (general load), power consumption information (specific load), storage battery 62 information, solar battery 64 information, power outage information, power generation information (fuel cell) as energy. Wireless transmission to the management device 81.

The energy management device 81 is a measuring device for buying and selling power information, power consumption information (general load), power consumption information (specific load), storage battery 62 information, solar cell 64 information, power failure information, and power generation information (fuel cell). 40.

Further, the energy management device 81 and the fuel cell 63 are configured to be capable of wireless communication with each other, and the energy management device 81 wirelessly communicates with the fuel cell 63 to thereby obtain information on the fuel cell 63 (hot water storage in the hot water storage tank 632). Quantity, device information, error information, etc.).

The energy management device 81 can communicate with the power converter 51 via the measurement device 40 by wirelessly communicating with the measurement device 40. The energy management device 81 can also communicate with the fuel cell 63 wirelessly. And the energy management apparatus 81 controls each operation | movement of the storage battery 62, the fuel cell 63, and the solar cell 64 by controlling the power converter 51 and the fuel cell 63 based on said each information.

For example, if the system power supply 61 is energized, the energy management device 81 supplies power to the general load 70 and the specific load 80 using the power of the system power supply 61, the storage battery 62, the fuel cell 63, and the solar battery 64. Do. Further, the energizing energy management device 81 charges the storage battery 62 using the power of the system power supply 61 and the solar battery 64. In addition, the energized energy management device 81 also controls the amount of power to be reversely flowed to the system power supply 61 using the generated power of the solar battery 64.

In addition, the energy management device 81 supplies power to the specific load 80 using each power of the storage battery 62, the fuel cell 63, and the solar cell 64 if the system power supply 61 is in a power failure. Further, the energy management device 81 during a power outage charges the storage battery 62 using the power of the solar battery 64.

The energy management device 81 and the display terminal 82 are configured to be capable of wireless communication with each other. In response to a request from the display terminal 82, the energy management device 81 generates display information for causing the display terminal 82 to display the above information, the control states of the power converter 51 and the fuel cell 63, and the like. Transmit to the terminal 82. The display terminal 82 displays the received display information on the screen, and also makes a voice notification if necessary. As the display terminal 82, a dedicated terminal having a monitor screen and a speaker, a mobile phone, a personal computer, or the like is used.

Next, the notification process according to the hot water storage amount of the fuel cell 63 during a power failure, which is the gist of the present invention, will be described with reference to FIG. FIG. 1 is a block diagram showing an outline of the configuration of the energy management system, and a part of the configuration of FIG. 2 is omitted. In FIG. 1, a broken line indicates an AC circuit, a one-dot chain line indicates a DC circuit, and a solid line indicates an information transmission path.

First, since the solar cell 64 cannot generate power during a power outage at night, the energy management device 81 performs power control using only the storage battery 62 and the fuel cell 63.

The energy management device 81 includes an information acquisition unit 81a, a power control unit 81b, a time calculation unit 81c, and a power supply information generation unit (hereinafter also referred to as an information generation unit) 81d.

The information acquisition unit 81a wirelessly communicates with the measurement device 40, thereby buying and selling power, power consumption information (general load), power consumption information (specific load), information on the storage battery 62, information on the solar battery 64, power failure information, Power generation information (fuel cell) is acquired from the measurement device 40. Further, the information acquisition unit 81 a acquires information on the fuel cell 63 by wirelessly communicating with the fuel cell 63. That is, the information acquisition unit 81a can acquire information such as the power consumption of the specific load 80, the stored power of the storage battery 62, the amount of hot water stored in the hot water storage tank 632, and the amount of power generated by the fuel cell 63 during the night outage. .

Then, the power control unit 81b controls the power converter 51 and the fuel cell 63 based on the above information, controls the operations of the storage battery 62 and the fuel cell 63, and supplies power to the specific load 80.

However, the fuel cell 63 stops power generation by the power generation unit 631 when the amount of hot water stored in the hot water storage tank 632 exceeds a predetermined amount (full storage state). That is, the power generation possible time during which the fuel cell 63 can continue to generate power varies depending on the amount of hot water stored, so whether or not the fuel cell 63 can be used during a power failure period depends on the amount of hot water stored. Then, during the night power outage period, when power is supplied to the specific load 80 using the stored power of the storage battery 62 and the generated power of the fuel cell 63, the amount of hot water stored in the fuel cell 63 is fully stored, Electric power must be supplied using only the stored electric power of the storage battery 62. Note that the amount of stored hot water decreases as the user uses hot water.

Here, in the power conversion device 50, the maximum power (constraint output) that can be output from the self-supporting terminal 57 is determined in advance, and when the fuel cell 63 stops power generation, the power consumption of the specific load 80 exceeds the constraint output. Sometimes. When the output of the self-supporting terminal 57 exceeds the constraint output, the power converter 51 stops the output from the self-supporting output unit 56 and stops the output from the self-supporting terminal 57. Therefore, in the power failure period, there is a possibility that the power supply from the independent distribution board 20 to the specific load 80 stops at a timing not intended by the user.

Therefore, the energy management device 81 creates power supply information in the power outage period in consideration of the power generation possible time of the fuel cell 63, and displays the power supply information on the display terminal 82, so that the power in the power outage period can be displayed to the user. Information on the prospects of continuous supply is reported.

First, the time calculation unit 81 c derives a power generation possible time during which the fuel cell 63 can continue power generation based on the amount of hot water stored in the hot water storage tank 632. The time calculation unit 81c calculates the power generation possible time of the fuel cell 63 shorter as the amount of hot water stored is larger, and calculates the power generation possible time of the fuel cell 63 longer as the amount of hot water stored is smaller. The power generation possible time is a time during which the rated operation in which the fuel cell 63 outputs the rated power is possible. Note that the output of the fuel cell 63 used for deriving the power generation possible time is not limited to the rated power, and may be, for example, 70% of the rated power.

The information generation unit 81d generates power supply information based on the stored power of the storage battery 62, the power generation possible time of the fuel cell 63, and the power consumption of the specific load 80, and outputs this power supply information to the display terminal 82.

The display terminal 82 corresponds to a notification unit, displays the power supply information received from the information generation unit 81d on the screen, and performs voice notification if necessary.

The power supply information generated by the information generation unit 81d will be described below.

As an example of the power supply information, information on the remaining time in which power can be continuously supplied to the specific load 80 "power supply remaining time information" and information on the remaining power that can be supplied from the storage battery 62 will be described.

The power supply remaining time information is the remaining time (power supply remaining time) in which the power consumption of the specific load 80 can be continuously supplied using the stored power of the storage battery 62 and the generated power of the fuel cell 63. This remaining power supply time information is derived based on the stored power of the storage battery 62, the power generation possible time of the fuel cell 63, and the power consumption information of the specific load 80. The remaining power supply time becomes longer as the stored power of the storage battery 62 is larger. The remaining power supply time becomes longer as the amount of hot water stored in the fuel cell 63 is smaller and the power generation possible time of the fuel cell 63 is longer. Furthermore, the remaining power supply time becomes longer as the power consumption of the specific load 80 is smaller.

The remaining power supply time information is information in consideration of the power generation possible time of the fuel cell 63. That is, since the remaining power supply time information is highly accurate information considering the power generation possible time of the fuel cell 63, the user who viewed the remaining power supply time information appropriately adjusts the operation of the specific load 80 during the power failure period. Thus, electric power can be used effectively. Therefore, the user can appropriately use the stored power of the storage battery 62 and the generated power of the fuel cell 63, and the situation where the power supply to the specific load 80 stops at a timing not intended by the user during the power failure. Occurrence can be suppressed.

The information generation unit 81d is based on the stored power of the storage battery 62, the power generation possible time of the fuel cell 63, and the power consumption of the specific load 80 only when the power generation possible time is equal to or longer than a predetermined lower limit time (predetermined time). Thus, it is preferable to generate the remaining power supply time information. In this case, when the power generation possible time is less than the lower limit time, the information generation unit 81d supplies power based on the stored power of the storage battery 62 and the power consumption of the specific load 80 without considering the power generation possible time of the fuel cell 63. Generate remaining time information.

Next, the tightness information is the tightness rate of the power supplied to the specific load 80 when the stored power of the storage battery 62 and the generated power of the fuel cell 63 are used. The maximum power that can be supplied from the storage battery 62 to the specific load 80 is determined by the maximum power (constraint output) that can be output from the self-standing terminal 57 of the power converter 51. Then, the tightness rate = {(power consumption of the specific load 80−rated power of the fuel cell 63) / restricted output of the power converter 51}. That is, the tightness rate is a value that takes into consideration the power generated by the fuel cell 63 (rated power).

Further, it is preferable that this tightness information is created in consideration of the stored power of the storage battery 62 and the power generation possible time of the fuel cell 63. For example, as the stored power of the storage battery 62 is larger, the tightness rate is corrected in the decreasing direction, and as the stored power of the storage battery 62 is smaller, the tightness rate is corrected in the increasing direction. Furthermore, the compression rate is corrected in the decreasing direction as the power generation possible time of the fuel cell 63 is long, and the compression rate is corrected in the increasing direction as the power generation possible time of the fuel cell 63 is short. In this case, the tightness information is information in consideration of the power generation possible time of the fuel cell 63. That is, since this tightness information becomes highly accurate information considering the power generation possible time of the fuel cell 63, the user who sees the tightness information appropriately adjusts the operation of the specific load 80 during the power failure period, Can be used effectively. Therefore, the user can appropriately use the stored power of the storage battery 62 and the generated power of the fuel cell 63, and the situation where the power supply to the specific load 80 stops at a timing not intended by the user during the power failure. Occurrence can be suppressed.

As described above, the energy management system using the energy management device 81 accurately reports information on the power that can be supplied to the load in consideration of the power generation capability of the cogeneration device such as the fuel cell 63 depending on the amount of stored hot water. it can.

In addition, the information generation unit 81d uses the above-described tightness rate as tightness information, but is not limited thereto. The information generation unit 81d may use other information regarding the remaining power that can be supplied from the storage battery 62 as the tightness information. In this case, the information generation unit 81d converts the stored power of the storage battery 62, the power generation possible time of the fuel cell 63, and the power consumption of the specific load 80 only when the power generation possible time is equal to or longer than a predetermined lower limit time (predetermined time). Based on this, it is preferable to generate tightness information. When the power generation possible time is less than the lower limit time, the information generation unit 81d generates tightness information based on the stored power of the storage battery 62 and the power consumption of the specific load 80 without using the power generation possible time of the fuel cell 63. .

In addition, the information generation unit 81d preferably generates power supply information that causes the display terminal 82 to execute a notification method according to the content of the power supply information.

For example, when generating the remaining power supply time information, if the remaining power supply time is shorter than a predetermined time, the information generation unit 81d sets the display screen color, layout, etc. to a highly urgent design, and further sounds such as a buzzer sound and a message. Include information. Accordingly, when displaying the remaining power supply time information, the display terminal 82 can strongly notify the user that the remaining power supply time is short using visual information and audio information.

Further, when generating the tightness information, if the tightness rate is higher than a predetermined value, the information generating unit 81d sets the display screen color, layout, etc. to a highly urgent design, and further includes sound information such as a buzzer sound and a message. . Accordingly, when displaying the tightness information, the display terminal 82 can strongly notify the user that the tightness rate is high using visual information and audio information.

Further, it is preferable that the time calculation unit 81c derives the power generation possible time based on the amount of hot water stored in the hot water storage tank 632 and the temperature of the hot water in the hot water storage tank 632. In this case, the power generation unit 631 of the fuel cell 63 can generate power when the amount of hot water stored in the hot water storage tank 632 is not fully stored or when the temperature of the hot water stored in the hot water storage tank 632 is equal to or lower than a predetermined temperature. Therefore, the time calculation unit 81c can set the power generation possible time of the fuel cell 63 to be longer, and the fuel cell 63 can increase the power generation amount at the time of power failure.

Next, notification processing according to the amount of hot water stored in the fuel cell 63 during the daytime blackout period will be described.

First, in the daytime power outage period, the solar cell 64 can generate power, and the energy management device 81 performs power control using the storage battery 62, the fuel cell 63, and the solar cell 64.

The information acquisition unit 81a of the energy management device 81 performs wireless communication with the measurement device 40, and buys and sells power, power consumption information (general load), power consumption information (specific load), storage battery 62 information, and solar cell 64 information. The power failure information and the power generation information (fuel cell) are acquired from the measuring device 40. Further, the information acquisition unit 81 a acquires information on the fuel cell 63 by wirelessly communicating with the fuel cell 63. In other words, the information acquisition unit 81a includes information on the power consumption of the specific load 80, the stored power of the storage battery 62, the hot water storage amount of the hot water storage tank 632, the power generation amount of the fuel cell 63, and the power generation amount of the solar cell 64 during the daytime power outage period. Can be obtained.

Then, the power control unit 81b controls the power converter 51 and the fuel cell 63 based on each of the above information, controls each operation of the storage battery 62, the fuel cell 63, and the solar cell 64 to the specific load 80. Supply power.

In this case, the information generation unit 81d of the energy management device 81 supplies power based on the stored power of the storage battery 62, the power generation possible time of the fuel cell 63, the generated power of the solar battery 64, and the power consumption information of the specific load 80. Generate remaining time information.

Further, the information generation unit 81d obtains the compression rate = {(power consumption of the specific load 80−rated power of the fuel cell 63) / restricted output of the power converter 51}, and generates the compression information based on this compression rate. .

That is, during the daytime power outage period, the information generation unit 81d generates power supply information such as remaining power supply time information and tightness information, and the display terminal 82 notifies the user of the power supply information. Similar effects can be obtained.

(Summary)
As described above, the energy management device 81 manages power supply to the specific load 80 (load) using the storage battery 62 and the cogeneration device (fuel cell 63). The cogeneration apparatus stops power generation when hot water is generated from water during power generation and the amount of hot water stored in the hot water storage tank 632 for storing the generated hot water becomes a predetermined amount or more. The energy management device 81 includes an information acquisition unit 81 a that acquires information on the power consumption of the specific load 80, the stored power of the storage battery 62, and the amount of hot water stored in the hot water storage tank 632. Furthermore, the energy management device 81 includes a time calculation unit 81 c that derives a power generation possible time during which the cogeneration device can continue power generation based on the amount of hot water stored in the hot water storage tank 632. Furthermore, the energy management device 81 includes a power supply information generation unit 81d. The power supply information generation unit 81d relates to the power that can be supplied to the specific load 80 using the storage battery 62 and the cogeneration device based on the stored power of the storage battery 62, the power generation time of the cogeneration device, and the power consumption of the specific load 80. Power supply information is generated. The power supply information generation unit 81d outputs this power supply information to the display terminal 82 (notification unit).

According to this configuration, the energy management device 81 outputs highly accurate power supply information in consideration of the power generation possible time of the cogeneration device (fuel cell 63). Electricity can be used effectively by appropriately adjusting the operation. Therefore, the user can appropriately use the stored power of the storage battery 62 and the generated power of the cogeneration apparatus, and the occurrence of a situation where the power supply to the load stops at a timing unintended by the user during the power failure. Can be suppressed.

Therefore, the energy management device 81 can accurately report information on the power that can be supplied to the load in consideration of the power generation capability of the cogeneration device (fuel cell 63) depending on the amount of hot water stored in the hot water storage tank 632.

Here, the power supply information is the remaining power that can be continuously supplied to the specific load 80 based on the stored power of the storage battery 62, the power generation possible time of the cogeneration device (fuel cell 63), and the power consumption of the specific load 80 (load). Time information is preferred.

According to this configuration, information on the remaining time during which power can be continuously supplied to the specific load 80 is highly accurate information in consideration of the power generation possible time of the cogeneration apparatus (fuel cell 63). Therefore, the user who has seen the remaining time information can appropriately use the power by appropriately adjusting the operation of the specific load 80 during the power failure. Therefore, the user can appropriately use the stored power of the storage battery 62 and the generated power of the cogeneration apparatus, and the situation where the power supply to the specific load 80 stops at a timing not intended by the user during the power outage period. Occurrence can be suppressed.

Here, the power supply information is information on the remaining power that can be supplied from the storage battery 62 based on the stored power of the storage battery 62, the power generation possible time of the cogeneration device (fuel cell 63), and the power consumption of the specific load 80 (load). It is preferable.

According to this configuration, the information on the remaining power that can be supplied from the storage battery 62 is highly accurate information in consideration of the power generation possible time of the cogeneration apparatus (fuel cell 63). Therefore, the user who has seen the information on the remaining power can appropriately use the power by appropriately adjusting the operation of the specific load 80 during the power failure. Therefore, the user can appropriately use the stored power of the storage battery 62 and the generated power of the cogeneration apparatus, and the situation where the power supply to the specific load 80 stops at a timing not intended by the user during the power outage period. Occurrence can be suppressed.

Here, it is preferable that the power supply information generation unit 81d generates power supply information that causes the display terminal 82 (notification unit) to execute a notification method according to the content of the power supply information.

According to this configuration, the energy management device 81 can inform the user of the content of the power supply information by a notification method according to the content of the power supply information.

Here, it is preferable that the time calculation unit 81c derives the power generation possible time based on the amount of hot water stored in the hot water storage tank 632 and the temperature of the hot water in the hot water storage tank 632.

According to this configuration, the energy management device 81 can derive the power generation possible time based on the amount of hot water stored in the hot water storage tank 632 and the temperature of the hot water in the hot water storage tank 632.

Here, when the power generation possible time is equal to or longer than the predetermined time, the power supply information generation unit 81d converts the stored power of the storage battery 62, the power generation possible time of the cogeneration device (fuel cell 63), and the power consumption of the specific load 80 (load). Based on this, it is preferable to generate power supply information. In addition, when the power generation possible time is less than the predetermined time, the power supply information generation unit 81d uses the power generation information of the storage battery 62 and the power consumption of the specific load 80 without using the power generation possible time of the cogeneration apparatus. Is preferably generated.

According to this configuration, the energy management device 81 can generate power supply information according to the power generation possible time of the cogeneration device (fuel cell 63).

In addition, the energy management system described above is a cogeneration system (fuel that stops power generation when the amount of hot water stored in the storage battery 62 and the hot water storage tank 632 that generates hot water from water during power generation and stores the generated hot water exceeds a predetermined amount. Battery 63). Furthermore, the energy management system includes an energy management device 81 that manages power supply to the specific load 80 (load) using the storage battery 62 and the cogeneration device, and generates power supply information related to power that can be supplied to the specific load 80. . Furthermore, the energy management system includes a display terminal 82 (notification unit) that notifies the power supply information generated by the energy management device 81. The energy management device 81 includes an information acquisition unit 81 a that acquires information on the power consumption of the specific load 80, the stored power of the storage battery 62, and the amount of hot water stored in the hot water storage tank 632. Furthermore, the energy management device 81 includes a time calculation unit 81 c that derives a power generation possible time during which the cogeneration device can continue power generation based on the amount of hot water stored in the hot water storage tank 632. Furthermore, the energy management device 81 generates power supply information based on the stored power of the storage battery 62, the power generation possible time of the cogeneration device, and the power consumption of the specific load 80, and outputs this power supply information to the display terminal 82. 81d.

According to this configuration, the energy management system can accurately report information on the power that can be supplied to the load in consideration of the power generation capability of the cogeneration device (fuel cell 63) depending on the amount of hot water stored in the hot water storage tank 632.

Here, the cogeneration apparatus is preferably a fuel cell 63.

According to this configuration, the energy management system can report information on the power that can be supplied to the load in consideration of the power generation capability of the fuel cell 63.

Further, the energy management method is a method of managing power supply to the specific load 80 (load) using the storage battery 62 and the cogeneration device (fuel cell 63). The cogeneration apparatus stops power generation when hot water is generated from water during power generation and the amount of hot water stored in the hot water storage tank 632 for storing the generated hot water becomes a predetermined amount or more. This energy management method includes information acquisition processing for acquiring information on the power consumption of the specific load 80, the stored power of the storage battery 62, and the amount of hot water stored in the hot water storage tank 632. Further, the energy management method includes time calculation processing for deriving a power generation possible time during which the cogeneration apparatus can continue power generation based on the amount of hot water stored in the hot water storage tank 632. Furthermore, the energy management method includes power supply information generation processing. The power supply information generation process is a power supply related to the power that can be supplied to the specific load 80 using the storage battery 62 and the cogeneration device based on the stored power of the storage battery 62, the power generation time of the cogeneration device, and the power consumption of the specific load 80. Generate information. The power supply information generation process outputs this power supply information to the display terminal 82 (notification unit).

According to this energy management method, information on the power that can be supplied to the load can be accurately reported in consideration of the power generation capability of the cogeneration device (fuel cell 63) depending on the amount of hot water stored in the hot water storage tank 632.

Further, the program of the present embodiment is a program that causes a computer to function as any of the energy management devices 81 described above.

According to this program, information on the power that can be supplied to the load can be accurately reported in consideration of the power generation capability of the cogeneration device (fuel cell 63) depending on the amount of hot water stored in the hot water storage tank 632.

Further, the above-described program may be provided in a state stored in a computer-readable storage medium, or may be provided through an electric communication line such as the Internet.

Claims

Energy that manages the supply of power to the load using a storage battery and a cogeneration system that generates hot water from water during power generation and stores the generated hot water when the amount of hot water stored exceeds a predetermined level. A management device,
An information acquisition unit for acquiring each information of power consumption of the load, stored power of the storage battery, and hot water storage amount of the hot water storage tank;
A time calculation unit for deriving a power generation possible time during which the cogeneration apparatus can continue power generation based on the amount of hot water stored in the hot water storage tank;
Based on the storage power of the storage battery, the power generation possible time of the cogeneration device, and the power consumption of the load, power supply information relating to the power that can be supplied to the load using the storage battery and the cogeneration device is generated, An energy management apparatus comprising: a power supply information generation unit that outputs the power supply information to a notification unit.
The power supply information is information on remaining time in which power can be continuously supplied to the load based on the stored power of the storage battery, the power generation possible time of the cogeneration apparatus, and the power consumption of the load. The energy management apparatus according to claim 1.
The power supply information is information on remaining power that can be supplied from the storage battery based on the stored power of the storage battery, the power generation possible time of the cogeneration device, and the power consumption of the load. Energy management equipment.
4. The energy management apparatus according to claim 1, wherein the power supply information generation unit generates the power supply information that causes the notification unit to execute a notification method according to a content of the power supply information.
5. The energy management device according to claim 1, wherein the time calculation unit derives the power generation possible time based on a hot water storage amount of the hot water storage tank and a temperature of hot water in the hot water storage tank. .
The power supply information generation unit
When the power generation possible time is a predetermined time or more, based on the stored power of the storage battery, the power generation possible time of the cogeneration device, the power consumption of the load, to generate the power supply information,
When the power generation possible time is less than a predetermined time, the power supply information is generated based on the stored power of the storage battery and the power consumption of the load without using the power generation possible time of the cogeneration apparatus. The energy management device according to any one of claims 1 to 5.
A storage battery,
A cogeneration system that generates hot water from water during power generation and stops power generation when the amount of hot water stored in the hot water storage tank that stores the generated hot water exceeds a predetermined amount;
An energy management device that manages power supply to a load using the storage battery and the cogeneration device, and generates power supply information related to power that can be supplied to the load;
A notification unit that notifies the power supply information generated by the energy management device;
The energy management device includes:
An information acquisition unit for acquiring each information of power consumption of the load, stored power of the storage battery, and hot water storage amount of the hot water storage tank;
A time calculation unit for deriving a power generation possible time during which the cogeneration apparatus can continue power generation based on the amount of hot water stored in the hot water storage tank;
A power supply information generation unit configured to generate the power supply information based on the stored power of the storage battery, the power generation possible time of the cogeneration apparatus, and the power consumption of the load, and to output the power supply information to a notification unit. And energy management system.
The energy management system according to claim 7, wherein the cogeneration device is a fuel cell.