WO2016075862A1

WO2016075862A1 - Electric power management device, and information presenting method

Info

Publication number: WO2016075862A1
Application number: PCT/JP2015/005131
Authority: WO
Inventors: 徳永　吉彦; 尚弘福田
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2014-11-12
Filing date: 2015-10-09
Publication date: 2016-05-19
Also published as: JP2016095598A; JP6264695B2

Abstract

An electric power management device (10) is provided with: a first acquiring unit (11) which acquires, at a first time point, first information related to the status of use of electric power by a consuming home to which a specific piece of equipment having an electric power generating function or an electric power storing function has been introduced; a second acquiring unit (12) which acquires, at a second time point later than the first time point, second information related to the status of use of electric power by the consuming home; an equipment information acquiring unit (13) which acquires equipment information of a candidate piece of equipment, which is a piece of equipment that is a candidate for being introduced into the consuming home, other than the specific piece of equipment, and is a piece of equipment having an electric power generating function or an electric power storing function; and an information output unit (14) which outputs presentation information including the equipment information of the candidate piece of equipment, in accordance with a variation in the status of use of electric power, acquired by comparing the acquired first information and the acquired second information.

Description

Power management apparatus and information presentation method

The present invention relates to a power management apparatus and the like for presenting information that is a material for determining whether or not a device having a power generation function or a power storage function should be introduced to a consumer.

Conventionally, HEMS (Home Energy Management System) which performs energy management in a house is known. In HEMS, in order to reduce energy consumption, one or more HEMS devices in a house are controlled by a HEMS controller via a HAN (Home Area Network). Moreover, HEMS measures the power consumption in a house, for example, displays a measurement result with the HEMS apparatus in a house, and makes a resident recognize power consumption.

Conventionally, the electricity bill is calculated based on the measurement result from the power measuring device that measures the amount of power purchased from the commercial power grid and the power sold to the power grid, and the unit price of the power bill. A display device that performs display is known (see Patent Document 1).

JP 2008-158701 A

By the way, in a consumer who has introduced a power generation device or a power storage device, the economic effect as expected at the time of introduction may not be obtained due to a change in the situation after the introduction. However, in such a case, it is not easy to determine whether or not to replace or add a power generation device or a power storage device.

Therefore, the present invention provides a power management apparatus and the like for presenting information for assisting the determination of replacement or addition of a device having a power generation function or a power storage function.

The power management device according to one aspect of the present invention obtains first information related to a power usage state of a consumer in which a specific device having a power generation function or a power storage function is introduced at a first time point. A second acquisition unit that acquires second information related to the power usage status of the consumer at a second time point after the first time point, and a candidate to be introduced to the consumer The device information acquisition unit that acquires device information of a candidate device that is a device different from the specific device and has a power generation function or a power storage function, and the acquired first information and the second information And an information output unit that outputs presentation information including device information of the candidate device in accordance with a change in power usage obtained by the comparison.

An information presentation method according to an aspect of the present invention is an information presentation method using a power management apparatus, and at a first time, use of power of a customer into which a specific device having a power generation function or a power storage function is introduced A first acquisition step of acquiring first information related to the situation, and a second acquisition of second information related to the usage status of the consumer's power at a second time point after the first time point An acquisition step, and a device information acquisition step of acquiring device information of a candidate device that is a device different from the specific device and that has a power generation function or a power storage function, which is a candidate to be introduced to the consumer; And an information output step of outputting presentation information including device information of the candidate device in accordance with a change in power usage obtained by comparing the acquired first information and the second information.

The power management apparatus or the like according to the present invention can output information for assisting the determination of replacement or addition of a device having a power generation function or a power storage function.

FIG. 1 is a system schematic diagram showing a group of devices related to the power management apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a system configuration of the power management apparatus according to the first embodiment. FIG. 3 is a diagram illustrating information input to and output from the power management apparatus according to the first embodiment. FIG. 4 is a flowchart showing information presentation processing of the power management apparatus according to the first embodiment. FIG. 5 is a flowchart of an improvement plan trial calculation process. FIG. 6 is a diagram illustrating a first trial calculation example of the improvement plan. FIG. 7 is a diagram illustrating a second trial calculation example of the improvement plan. FIG. 8 is a diagram illustrating a third trial calculation example of the improvement plan. FIG. 9 is a diagram illustrating a specific example of the information presentation screen.

Hereinafter, embodiments will be described with reference to the drawings. Each of the embodiments shown here shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangement and connection forms, steps (steps) and order of steps, and the like shown in the following embodiments are examples and limit the present invention. is not. Among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims can be arbitrarily added. Each figure is a mimetic diagram and is not necessarily illustrated strictly.

(Embodiment 1)
Hereinafter, the power management apparatus according to the first embodiment will be described.

[Constitution]
First, the configuration of the power management apparatus according to the first embodiment will be described. FIG. 1 is a system schematic diagram showing a group of devices related to the power management apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a system configuration of the power management apparatus according to the first embodiment. In addition, in FIG. 1, since the detailed structure of the

consumers

20a, 20b, and 20c is the same as that of the consumer 20, illustration and description are abbreviate | omitted.

As shown in FIG. 1, the power management apparatus 10 according to the first embodiment communicates with a HEMS controller provided in each consumer via a network 31 (including a wide area network such as the Internet). Specifically, the power management apparatus 10 communicates with the HEMS controller (for example, the HEMS controller 100 provided in the consumer 20) provided in each consumer.

Here, each consumer is provided with PV (Photovoltaic)

panels

40, 40a, 40b, and 40c as examples of specific devices. The specific device may be any device as long as it has a power generation function or a power storage function. Examples of the device (power storage device) having a power storage function include a household lithium ion storage battery system (hereinafter simply referred to as a storage battery), EV (Electric Vehicle), and the like.

The power management apparatus 10 manages the amount of power used by each consumer, and gives information to the consumer 20 that assists in determining whether the PV panel 40 should be replaced (replaced) or whether facilities should be added. It is characterized by having an information presentation function for presentation.

Specifically, the power management apparatus 10 compares the power usage status at the time of introduction with the current power usage status, and can be expected to improve economy by being introduced to the customer 20 at the current time. The presentation information including the information is output. Such presentation information is displayed as an image on the terminal device 300 of the customer or the display (display screen) of the portable terminal 50.

With such presentation information, the resident of the customer 20 can predict the economy when the PV panel 40 is replaced with another model and the economy when a new device is additionally introduced.

Here, first, a detailed configuration of the power management apparatus will be described with reference to FIG. As illustrated in FIG. 2, the power management apparatus 10 includes a first acquisition unit 11, a second acquisition unit 12, a device information acquisition unit 13, an information output unit 14, and a storage unit 15.

The power management apparatus 10 is a server operated by, for example, an electric power company, an equipment manufacturing company, or other organizations, and has a function of providing various information to the HEMS of each consumer. The information provided from the power management device 10 differs depending on the operator of the power management device 10, but for example, performance information regarding the performance of a specific device such as a power generation device or a power storage device, between a power company and a house. Information related to power trading (for example, price information indicating the unit price of trading) and the like. The performance information includes, for example, the capacity of the power generation apparatus (solar battery capacity, etc.), the conversion efficiency measured in the reference state, the capacity of the power storage apparatus (storage capacity), the charge / discharge efficiency, and the like.

The 1st acquisition part 11 acquires the 1st information relevant to the usage condition of the electric power in the customer's 20 past predetermined time (1st time). More specifically, the first acquisition unit 11 acquires first information from the HEMS controller 100 through the network 31 based on the control of the information output unit 14.

The first acquisition unit 11 is specifically a general-purpose communication module (communication circuit), but is not particularly limited. The first acquisition unit 11 may perform communication using any wired or wireless communication method (communication standard).

Note that the first information is, for example, a power usage history in the past (the predetermined time point in the past). Specifically, the first information includes, in the past, the self-consumption rate of the consumer 20, the power sale rate of the consumer 20, the self-consumption power unit price, the power sale unit price, and the power generation amount of the specific device. .

The second acquisition unit 12 acquires second information related to the power usage status at the current time of the consumer 20 (at the time of performing the information presentation process, the second time point). More specifically, the second acquisition unit 12 acquires second information from the HEMS controller 100 through the network 31 based on the control of the information output unit 14.

The second acquisition unit 12 is specifically a general-purpose communication module (communication circuit), but is not particularly limited. The second acquisition unit 12 may perform communication using any wired or wireless communication method (communication standard).

Note that the second information is, for example, the latest power usage history. Specifically, the second information includes the consumer's own consumption rate, the consumer's power sale rate, the consumer's power consumption unit price, the electricity sale unit price, the power generation amount of the specific device, and the like at the present time. .

The device information acquisition unit 13 acquires device information related to a candidate device having a power generation function or a power storage function. For example, the device information acquisition unit 13 acquires device information from a server other than the power management apparatus 10 (for example, a server in which device manufacturers manage device information) through the network 31 based on the control of the information output unit 14. As will be described later, the device information acquisition unit 13 may acquire information regarding the PV panel 40 provided in the customer 20.

The device information acquisition unit 13 is specifically a general-purpose communication module (communication circuit), but is not particularly limited. The device information acquisition unit 13 may perform communication using any wired or wireless communication method (communication standard).

An example of a candidate device (power generation device) having a power generation function is a PV panel, and an example of a candidate device (power storage device) having a power storage function is a storage battery or EV. The power storage device is a device for efficiently using electric power by storing and discharging or preparing for a power failure. Specifically, the device information of the candidate device is model information, performance information (external dimensions, power generation amount, power generation efficiency, storage capacity, etc.) of the candidate device, price information of the candidate device (information on the amount of the candidate device), etc. is there.

The information output unit 14 is introduced into the consumer 20 at the present time according to a change in the power usage status obtained by comparing the acquired first information with the acquired second information, and thereby the economy To generate and output presentation information including device information of candidate devices that can be improved. More specifically, the information output unit 14 outputs the presentation information to the portable terminal 50 through the network 31. An e-mail or a website is used to present information.

The information output unit 14 is specifically realized by a control unit such as a processor, a microcomputer, or a dedicated circuit, and a communication unit such as a communication module (communication circuit), but is not particularly limited. Further, the information output unit 14 may perform communication using any wired or wireless communication method (communication standard).

Note that the communication function of the information output unit 14, the first acquisition unit 11, the second acquisition unit 12, and the device information acquisition unit 13 may be realized as one communication unit.

The storage unit 15 is a database in which the first information acquired by the first acquisition unit 11, the second information acquired by the second acquisition unit 12, and the device information acquired by the device information acquisition unit 13 are stored. is there. Specifically, the storage unit 15 is an HDD (Hard Disk Drive) or a semiconductor memory.

Next, the system configuration at each consumer will be described. In addition, although the following description demonstrates the consumer 20, it is the same structure also about the

other consumers

20a, 20b, and 20c.

As shown in FIG. 1, the consumer 20 is provided with a PV panel 40, a power measuring device 200, a HEMS controller 100, a terminal device 300, and a HEMS device 310.

The PV panel 40 is a so-called solar cell module or the like, and is an example of a specific device having a power generation function. The electric power generated by the PV panel 40 is used, for example, to cover the electric power consumed by the electrical equipment in the consumer 20, and if there is a surplus, the surplus is sold to an electric power company.

The power measuring device 200 is provided in a distribution board or the like for branching the power supplied from the power system, and measures the amount of power used (consumed) by the electrical equipment connected to each branch circuit. Specifically, the power measuring apparatus 200 is an apparatus having an electric circuit such as a current sensor and a communication circuit. The electrical equipment in the consumer 20 includes a group of HEMS equipment, such as lighting equipment, air conditioning equipment (air conditioners), refrigerators, hot water supply equipment, electromagnetic cookers, television receivers, and EV charging devices. is there.

Note that the power measuring apparatus 200 can measure the amount of power generated by the PV panel 40 (power generation amount). In addition, the power measuring device 200 can measure the amount of power (amount of power sold) that flows backward to the power system out of the power generated by the PV panel 40. Moreover, when consuming electric power in the consumer 20, there are a case where the purchased electric power is consumed and a case where the electric power generated by the PV panel 40 is consumed. The consumption amount and the consumption amount of power generated by the PV panel 40 can be distinguished and measured.

The HEMS controller 100 is a device that is housed in, for example, a distribution board, collects measurement results of power usage from the power measurement device 200, and controls the HEMS equipment under certain conditions to reduce power usage. is there. The HEMS controller 100 is a terminal that is a HEMS device having a user interface (UI) in order to receive input from a resident (user) of the consumer 20 and to present information to the resident. Data is exchanged with the device 300.

The information presented to the resident is, for example, the above-described presentation information (information that assists in determining whether or not to install a candidate device). The HEMS controller 100 includes a memory, a communication circuit, and a CPU (Central Processing Unit). The memory is a ROM that stores a program and data in advance, a RAM that is used to store data or the like when the program is executed, and may include, for example, a nonvolatile memory. The CPU performs various processes by controlling a communication circuit and the like by executing a program stored in the memory. The communication circuit is a circuit for communicating with the power measuring apparatus 200 and the HEMS device group by wire such as wireless or LAN (Local Area Network) cable, PLC (Power Line Communication).

The HEMS device group includes a terminal device 300 having UI means, other HEMS devices 310, and the like. There may be three or more HEMS device groups constituting the HEMS in the customer 20.

The terminal device 300 receives input from a resident of the customer 20 and presents information (for example, video display, audio output, etc.), UI means (display, touch panel, keyboard, etc.), memory, communication circuit, CPU, For example, a personal computer, a monitor or the like. The terminal device 300 can display, for example, the power usage amount collected from the power measurement device 200 by the HEMS controller 100. That is, the resident of the consumer 20 can recognize the power usage amount by the terminal device 300.

The mobile terminal 50 is, for example, a mobile terminal owned by a resident of the customer 20. The portable terminal 50 accepts input from a resident of the consumer 20 and presents information (for example, video display, audio output, etc.), UI means (display, touch panel, keyboard, etc.), memory, communication circuit, CPU, Have The portable terminal 50 is, for example, a tablet terminal or a smartphone. In the first embodiment, the mobile terminal 50 is used as the UI of the resident of the consumer 20, but the terminal device 300 may be used instead of the mobile terminal 50.

[Information input / output to / from power management unit]
Next, various information input to the power management apparatus 10 (obtained by the power management apparatus 10) and various information output from the power management apparatus 10 will be described with reference to FIG. FIG. 3 is a diagram illustrating information input to and output from the power management apparatus 10.

First, information input to the power management apparatus 10 will be described.

The power management apparatus 10 receives information 61 on specific equipment provided to each consumer. Specifically, the information 61 regarding the specific device includes the presence / absence of the specific device, the usage status of the specific device, the type of the specific device (PV panel, storage battery, EV), the manufacturer of the specific device, and the product number of the specific device. , Installation years of specific equipment, installation price of specific equipment, etc.

For example, the power management apparatus 10 (device information acquisition unit 13) acquires information 61 related to a specific device from a server other than the power management device 10 (for example, a management server of a manufacturer of the specific device). When stored in the storage unit 15, the information 61 regarding the specific device may be acquired from the storage unit 15. Moreover, the information 61 regarding a specific apparatus may be input through the portable terminal 50 or the terminal device 300 of the consumer 20.

In addition, information 62 regarding the power measurement value is input to the power management apparatus 10. The information 62 on the power measurement value is a power measurement value measured by the power measurement device 200. Specifically, the power generation amount of the PV panel 40, the power sale amount, the private consumption amount, the charge / discharge amount of the power storage device, and the EV Charge and discharge amount. In the first embodiment, the power management apparatus 10 acquires the information 62 regarding the power measurement value from the HEMS controller 100 of each customer. However, when a server operated by the power company is provided outside the power management apparatus 10. Or from the server. Further, when the information 62 regarding the power measurement value is stored in the storage unit 15, the information 62 regarding the power measurement value may be acquired from the storage unit 15.

The information 62 regarding the power measurement value includes information regarding the past power measurement value acquired as the first information by the first acquisition unit 11 and information regarding the current power measurement value acquired by the second acquisition unit 12. Is included.

In addition, power price information 63 is input to the power management apparatus 10. Specifically, the power price information 63 includes a unit price of power for each time zone, a power sale unit price, a power purchase unit price, a basic charge, and the like. In other words, the power price information 63 is information relating to the electricity bill. For example, the power management apparatus 10 acquires the power price information 63 from a server operated by the power company. The power management apparatus 10 itself is a server operated by the power company, and the power price information 63 is stored in the storage unit 15. If it is stored, it may be acquired from the storage unit 15.

The power price information 63 includes past power price information acquired as first information by the first acquisition unit 11 and current power price information acquired by the second acquisition unit 12.

In addition, the device information 64 of the candidate device is input to the power management apparatus 10. Specifically, the device information 64 of candidate devices includes sales price information, lease price information, trade-in price information, power generation amount (power generation efficiency), charge / discharge amount (charge / discharge efficiency), subsidy, discount information, and the like. Further, the device information 64 of the candidate device includes information on the performance of the candidate device such as the PV panel, storage battery, and EV capacity, information on the manufacturer of the candidate device, information on the product number of the candidate device, and the like. For example, the power management apparatus 10 (device information acquisition unit 13) acquires the device information 64 of the candidate device from a server operated by the device manufacturer, and the power management device 10 itself is a server operated by the device manufacturer. If the device information 64 of the candidate device is stored in the storage unit 15, it may be acquired from the storage unit 15.

In addition, the power management apparatus 10 may be input with information 65 on lifestyle (life pattern) and environment information 66. Specifically, the information 65 on the lifestyle is the number of members of the family, the configuration, and the like. Specifically, the environmental information 66 includes temperature, amount of solar radiation, latitude, longitude, direction, and the like. The lifestyle-related information 65 and the environment information 66 are typically input through a portable terminal or a terminal device of each consumer. However, for example, when such information exists in a server other than the storage unit 15 or the power management apparatus 10, the information may be acquired from the storage unit 15 or such a server.

Next, information output from the power management apparatus 10 will be described.

From the power management apparatus 10, as the presentation information 70, information 71 indicating the economy expected at the beginning of the introduction of the specific device, information 72 indicating the economy currently expected, and an improvement plan 73 (replacement or introduction of equipment) Proposal) is output. In the first embodiment, an index indicating economy is used as the information 71 indicating the economy expected at the beginning of introduction and the information 72 indicating the economy expected at present. Details of such presentation information 70 will be described later.

[Operation]
Hereinafter, the operation (information presentation process) of the power management apparatus 10 will be described. FIG. 4 is a flowchart showing information presentation processing of the power management apparatus 10.

First, the device acquisition unit of the power management apparatus 10 acquires information on a specific device, which is information including the installation price of the installed PV panel 40 (S10). The 1st information relevant to the usage condition of the electric power of the consumer 20 in is acquired (S11). Then, the information output unit 14 calculates an investment payback year at the time of introduction (an example of a first index; hereinafter, also referred to as a first investment payback year) (S12). The investment payback year is an example of an index indicating economic efficiency, and is obtained by the following formula 1, for example.

In Equation 1, the annual predicted power generation amount is a predicted value of the power generation amount for one year calculated based on the power generation amount of the PV panel 40 at the first time point (actual value measured by the power measurement device 200). The annual predicted power generation amount (power generation amount of the PV panel 40) corresponds to the first information included in the information 62 regarding the power measurement value. In addition, when the actual value of the power generation amount for one year can be acquired, the actual value of the power generation amount for one year may be used instead of the annual predicted power generation amount.

The unit power consumption unit price (power purchase unit price) is represented as 28 yen / kWh, and the power sale unit price is represented as 37 yen / kWh. Such information is included in the first power price information 63 described above. It corresponds to information.

Here, the self-consumption rate and the power sale rate are expressed by the following formulas 2 and 3.

The monthly private consumption amount and the monthly power sale amount are represented by kWh, and such information corresponds to the first information included in the information 62 relating to the above-described power measurement value. In the above formula, as an example, the self-consumption rate and the power sale rate are calculated based on the monthly self-consumption amount and the monthly power sale amount. However, the self-consumption rate and the power sale rate may be calculated based on the self-consumption amount and the power sale amount in units of several months, or may be calculated based on the self-consumption amount and the power sale amount in units of years.

Next, the second acquisition unit 12 of the power management apparatus 10 acquires second information related to the current power usage state of the customer 20 (S13). Then, the information output unit 14 calculates the expected investment recovery year (an example of the second index, hereinafter also referred to as the second investment recovery year) (S14). The method for calculating the investment recovery year is as described above. In this case, the private power consumption unit price and the power sale unit price correspond to the second information included in the above-described power price information 63, and the monthly private consumption amount and the monthly power sale amount are included in the information 62 regarding the above-described power measurement value. It corresponds to the second information included.

Next, the information output unit 14 compares the calculated first investment recovery year with the calculated second investment recovery year, and the expected investment recovery year at the present time is greater than the expected investment recovery year at the time of introduction. Is also determined (S15). Specifically, the information output unit 14 determines whether the second investment recovery year / first investment recovery year is equal to or greater than a predetermined threshold.

When the second investment recovery year / first investment recovery year is equal to or greater than a predetermined threshold (Yes in S15), that is, when the investment recovery year is longer than originally expected, the information output unit 14 determines the improvement plan. (S16). If the second investment recovery year / first investment recovery year is less than the predetermined threshold (No in S15), the information presentation process is terminated. Note that the predetermined threshold value (≈the predetermined value) may be set in any way, but in the first embodiment, the predetermined threshold value is 1.

Hereinafter, the trial calculation of the improvement plan in step S16 will be described using the flowchart of FIG. FIG. 5 is a flowchart of an improvement plan trial calculation process.

First, the information output unit 14 of the power management apparatus 10 determines whether or not the consumer 20 as an information presentation target has a PV panel (S21).

When the customer 20 does not own the PV panel (No in S21), the information output unit 14 determines whether or not the customer 20 owns the power storage device (S22). Here, when the customer 20 does not own the power storage device (No in S22), replacement of the device or additional trial calculation is not performed, and a proposal for new introduction of the PV panel or the power storage device is performed (S23). ). When the customer 20 owns the power storage device (Yes in S22), trial calculation of replacement or addition of the power storage device or additional introduction of another PV panel is performed (S24).

On the other hand, when the customer 20 owns the PV panel (Yes in S21), the information output unit 14 determines whether or not the customer 20 owns the power storage device (S25). Here, when the customer 20 does not own the power storage device (No in S25), replacement or addition of the PV panel or addition calculation of the power storage device is performed (S26). If the customer 20 owns the power storage device (Yes in S25), replacement of the PV panel or power storage device or additional trial calculation is performed (S27). A specific example of the improvement plan trial will be described later.

As described above, after the improvement plan is calculated in step S16, the information output unit 14 presents the improvement plan (S17). Specifically, the information output unit 14 outputs presentation information including an improvement plan to the mobile terminal 50, and an information presentation screen is displayed on the display of the mobile terminal 50.

Finally, the resident of the customer 20 who has received the information performs an operation on the portable terminal 50, whereby a purchase screen is displayed on the display of the portable terminal 50 (S18).

Such information presentation processing is started when, for example, a resident of the customer 20 makes a request for information presentation to the power management apparatus 10 by operating the portable terminal 50 or the like. In addition, the information presentation process may be started periodically at any other time, for example, every several months. Further, the processing from step S11 to step S15 may be periodically performed, and the processing after step S16 may be performed only when Yes in step S15.

[Example of trial calculation of improvement plan 1]
Next, a trial calculation example of the above improvement plan will be described. FIG. 6 is a diagram illustrating a trial calculation example of an improvement plan. In addition, FIG. 6 is a figure which shows the trial calculation example of the improvement plan in the case of proposing the additional introduction of a PV panel with respect to the consumer 20 which has already introduced the PV panel 40. FIG.

First, the information output unit 14 uses the self-consumption at the time of introduction based on the monthly self-consumption and the monthly power sales at the time of introduction (estimated at the time of introduction) included in the first information acquired by the first acquisition unit 11. It calculates using a rate and a power sale rate, and the said Formula 2 and Formula 3. In the example of FIG. 6, the self-consumption rate at the time of introduction is 40%, and the power sale rate at the time of introduction is 60%.

Next, the information output unit 14 calculates the investment payback year at the time of introduction (first investment payback year) using the above-described formula 1. Specifically, the calculation of the investment payback year includes the first unit of electricity acquired by the first acquisition unit 11 and the unit price of power consumption and unit price of electricity sold at the time of introduction (estimated at the time of introduction). The power generation amount, the installation price (introduction cost) of the installed equipment acquired by the device information acquisition unit 13, and the calculated self-consumption rate and power sales rate are used. In the example of FIG. 6, the installation price of the PV panel 40 that has been introduced to the customer 20 (hereinafter also referred to as installed equipment) is 2 million yen, and the annual expected power generation at the time of introduction is 6000 kWh. is there. Further, it is assumed that the power consumption unit price at the time of introduction is 15 yen / kWh, and the power sale unit price at the time of introduction is 40 yen / kWh. As a result, the first investment recovery year is calculated as 11.11 years as shown in the following equation.

Next, the information output unit 14 calculates the expected investment payback year (second investment payback year) in the same manner as described above. Here, in the example of FIG. 6, three years have passed since the introduction, and the annual predicted power generation, unit power consumption unit price, and unit power sale unit price have not changed since the introduction, but the unit consumption rate It has increased from 40% to 60%.

Here, the second investment recovery year is calculated assuming that the PV panel installation price has been reduced by 2000000 ÷ 11.11 × 3 = 540000 yen based on the initial forecast. Specifically, the second investment payback year is calculated as 12.73 years as shown in the following formula. Accordingly, the second investment payback year / first investment payback year is 1 or more which is a predetermined threshold.

Here, as a method for reducing the self-consumption rate that has increased from the time of introduction, a method of increasing the amount of power generation can be considered.

Therefore, when such an increase in the self-consumption rate is detected, the information output unit 14 selects a PV panel as an additional installation facility, and performs a trial calculation when the PV panel is additionally installed. The information output unit 14 acquires device information of the PV panel (specifically, the annual predicted power generation amount, installation price, and the like) through the device information acquisition unit 13 and performs a trial calculation when the PV panel is additionally introduced.

For example, the information output unit 14 performs a trial calculation when an additional PV panel having an annual estimated power generation amount of 4000 kWh and an installation price of 1 million yen is introduced. Specifically, the information output unit 14 calculates a self-consumption rate when such a PV panel is additionally introduced, and recalculates the first investment recovery year based on the self-consumption rate. For example, if the self-consumption rate is 36% and the power selling rate is 60% due to the additional introduction of PV panels, the first investment recovery year is 10.84 as shown in the following formula as a result of recalculation. It will be a year.

Next, the information output unit 14 calculates the investment recovery year (third investment recovery year) of the PV panel to be additionally introduced. The calculation method is the same as in the first investment recovery year and the second investment recovery year. In the example of FIG. 6, the third investment payback year is calculated as 8.06 years from the present time (11.06 years from the introduction) as shown in the following formula.

Then, the information output unit 14 determines whether both the recalculated first investment recovery year and the third investment recovery year are shorter than the second investment recovery year. The presentation information including the improvement plan that presents the additional introduction of the PV panel is output. If the recalculated first investment recovery year and the third investment recovery year are both longer than the second investment recovery year, the device information of another PV panel (for example, a PV panel of a different model) And the trial calculation is performed again when this PV panel is introduced to the customer 20.

As described above, the information output unit 14 has, for example, the self-consumption rate at the second time point smaller than the self-consumption rate at the first time point, and the self-consumption power unit price at the second time point is the power selling unit price. If it is determined to be lower than that, presentation information including device information of a PV panel to be additionally introduced is output.

Thereby, the resident of the customer 20 can know the information of the PV panel that needs to be additionally introduced in order to shorten the investment recovery year, and the necessity of the addition of the PV panel can be determined with reference to such information. Judgment can be made.

[Example of trial calculation of improvement plan 2]
Next, another example of the above-described improvement plan trial calculation will be described. FIG. 7 is a diagram illustrating another trial calculation example of the improvement plan. In addition, FIG. 7 is a figure which shows the trial calculation example of the improvement plan in the case of proposing replacement | exchange of PV panel with respect to the consumer 20 who has introduced PV panel.

The information output unit 14 first calculates a private consumption rate and a power selling rate at the time of introduction. Then, the information output unit 14 calculates the investment payback year (first investment payback year) at the time of introduction. In the example of FIG. 7, as in the example of FIG. 6, the self-consumption rate at the time of introduction is calculated as 40%, and the power sale rate at the time of introduction is calculated as 60%. In the example of FIG. 7 as well, as in the example of FIG. 6, the installed price of the installed equipment is 2 million yen, and the estimated annual power generation at the time of introduction is 6000 kWh. Is 15 yen / kWh, and the power selling unit price at the time of introduction is 40 yen / kWh. Therefore, the first investment recovery year is calculated as 11.11 years.

Next, the information output unit 14 calculates the expected investment recovery year (second investment recovery year). Here, in the example of FIG. 7, three years have passed since the introduction, and the self-consumption rate, the self-consumption power unit price, and the power sale unit price have not changed since the introduction, but the annual estimated power generation amount Has decreased from 6000 kWh at the beginning of introduction to 3600 kWh. Therefore, as shown in the following formula, the second investment payback year is calculated to be 16.51 years that is longer than the first investment payback year. Accordingly, the second investment payback year / first investment payback year is 1 or more which is a predetermined threshold.

Here, when the power generation amount is lower than that at the time of introduction, a method of increasing the power generation amount by adding a PV panel may be considered, but here, a method of increasing the power generation amount by replacing the PV panel is described. To do.

When the information output unit 14 detects such a decrease in the amount of power generation, the PV panel is replaced and selected as the installation facility, and a trial calculation is performed when the PV panel is introduced. The information output unit 14 acquires the device information of the PV panel through the device information acquisition unit 13, and performs a trial calculation when the PV panel is replaced and introduced.

For example, the information output unit 14 performs a trial calculation when a PV panel having an annual estimated power generation amount of 7800 kWh and an installation price of 1.5 million yen is replaced and introduced. Specifically, the information output unit 14 calculates an investment recovery year (third investment recovery year) when such a PV panel is replaced and introduced. In the calculation of the third investment recovery year, the self-consumption rate increases as a result of the increase in the amount of power generation, which is 30%.

In addition, in the calculation of the third investment recovery year, the amortized residual value of the installed equipment is taken into account. In other words, in the calculation of the third investment recovery year, as the “PV panel installation price” of Equation 1, the installation price of the replacement installation equipment and the amortized residual value of the installed equipment (2 million yen-540,000 yen = 1.46 million) The sum of the yen) is used. The third investment recovery year is calculated as 11.67 years from the present time (14.67 years from the introduction) as shown in the following formula.

Then, the information output unit 14 determines whether or not the third investment recovery year is shorter than the second investment recovery year, and if it is shorter, the information output unit 14 includes an improvement plan that presents such a PV panel replacement introduction. Output presentation information.

As described above, when the information output unit 14 determines that the power generation amount of the PV panel 40 at the second time point is smaller than the power generation amount of the PV panel 40 at the first time point, for example, the information output unit 14 is replaced and introduced. The presentation information including the device information of the PV panel is output.

Thereby, the resident of the customer 20 can know the information of the PV panel that needs to be replaced in order to shorten the investment recovery year, and the necessity of replacement of the PV panel can be determined with reference to such information. Judgment can be made.

[Example of trial calculation of improvement plan 3]
Below, another trial calculation example of another improvement plan will be described. FIG. 8 is a diagram illustrating another trial calculation example of the improvement plan. In addition, FIG. 8 is a figure which shows the trial calculation example of the improvement plan in the case of proposing the additional introduction of a storage battery with respect to the consumer 20 who has already introduced the PV panel.

The information output unit 14 calculates a self-consumption rate and a power sale rate at the time of introduction based on the acquired monthly self-consumption amount and monthly power sale amount. In the example of FIG. 8, the self-consumption rate at the time of introduction is 70%, and the power sale rate at the time of introduction is 30%.

Next, the information output unit 14 calculates the investment recovery year (first investment recovery year) at the time of introduction. The calculation of the payback year is based on the unit price of electricity consumed and the unit price of electricity sold at the time of introduction (estimated at the time of introduction), the estimated annual power generation amount, the installation price of installed equipment, the calculated rate of self-consumption Electricity is used. In the example of FIG. 8, the installation price of the PV panel that has been introduced to the customer 20 (hereinafter also referred to as installed equipment) is 1 million yen, and the estimated annual power generation at the time of introduction is 6000 kWh. . Further, it is assumed that the power consumption unit price at the time of introduction is 25 yen / kWh, and the power sale unit price at the time of introduction is 15 yen / kWh. As a result, the first investment recovery year is calculated as 7.57 years as shown in the following equation.

Next, the information output unit 14 calculates the expected investment payback year (second investment payback year) in the same manner as described above. Here, in the example of FIG. 8, three years have passed since the introduction, and the annual predicted power generation amount, unit power consumption unit price, and unit power sale unit price have not changed from the time of introduction. It has fallen from 70% to 30%.

The second investment payback year is calculated assuming that the PV panel installation price has been reduced by 1000000 ÷ 7.57 × 3 = 396,000 yen based on the initial forecast. In this example, since the unit price of electricity sales is lower than the unit price of personal consumption, the second investment recovery year is calculated as 8.59 years, which is longer than the first investment recovery year, as shown in the following formula. Accordingly, the second investment payback year / first investment payback year is 1 or more which is a predetermined threshold.

Here, as one method for increasing the self-consumption rate, a storage battery is added, low-cost nighttime power is purchased and stored in the storage battery, and the stored power is used in the daytime to reduce the amount of power generation. A method of increasing is conceivable. The unit price of nighttime power is 10 yen / kWh.

If the information output unit 14 detects a decrease in the self-consumption rate when the unit consumption price is larger than the power sale unit price, the information output unit 14 selects the storage battery (power storage device) as an additional installation facility, and additionally installs the storage battery. If you do, make a trial calculation. The information output unit 14 acquires device information of the storage battery through the device information acquisition unit 13 and performs a trial calculation when the storage battery is additionally introduced.

For example, the information output unit 14 performs a trial calculation when a storage battery having an annual estimated charge / discharge amount of 3000 kWh and an installation price of 200,000 yen is additionally introduced. Specifically, the information output unit 14 calculates a self-consumption rate when such a storage battery is additionally introduced, and recalculates the first investment recovery year based on the self-consumption rate. For example, when the self-consumption rate is expected to increase to 65% due to the additional introduction of a storage battery, the first investment payback year is 7.68 years as shown in the following formula as a result of recalculation.

Next, the information output unit 14 calculates the investment recovery year (third investment recovery year) of the additionally installed storage battery. The calculation method is the same as in the first investment recovery year and the second investment recovery year. As shown in the example of FIG. 8, the third investment recovery year when a storage battery is added is calculated as 4.44 years from the present time (7.44 years from the introduction) as shown in the following formula. . The “difference due to night shift” in the following formula is the difference between the unit power consumption (unit price for daytime) and the unit price for nighttime power.

Then, the information output unit 14 determines whether the recalculated first investment recovery year and the third investment recovery year are shorter than the second investment recovery year. Output presentation information including an improvement plan that presents additional introduction of storage batteries.

As described above, the information output unit 14 has the self-consumption rate at the second time point larger than the self-consumption rate at the first time point, and the self-consumption power unit price at the second time point is higher than the power sale unit price. When it determines with being high, the presentation information containing the apparatus information of the storage battery used as the additional introduction object is output.

Thereby, the resident of the customer 20 can know the information of the storage battery that needs to be introduced in order to shorten the investment recovery year, and determine whether or not the storage battery needs to be added with reference to such information. Can do.

[Specific example of information presentation screen]
Hereinafter, a specific example of the information presentation screen displayed on the display by the portable terminal 50 that has received the presentation information output from the power management apparatus 10 will be described with reference to FIG. FIG. 9 is a diagram illustrating a specific example of the information presentation screen. FIG. 9 is a diagram showing an information presentation screen that displays the trial calculation result described with reference to FIG.

As shown in FIG. 9, the display of the portable terminal 50 includes, for example, a graph 51 indicating an investment recovery year (first investment recovery year) predicted at the time of introduction and an expected investment recovery year (second). A graph 52 showing the investment recovery year) is displayed. In this case, the information output unit 14 includes an index (more specifically, information for displaying the graph 51) indicating the expected economic efficiency at the calculated introduction time point (first time point) and the calculated current time point (first time). The presentation information including an index (more specifically, information for displaying the graph 52) indicating the economic efficiency expected at the second time) is output. In addition, in the example of FIG. 9, in addition to the graph 51 and the graph 52, the personal consumption rate is also displayed.

As described above, the presentation information includes an index (graph 51) indicating the economic efficiency expected at the time of introduction and an index (graph 53) indicating the economic efficiency expected at the present time, so that the resident of the customer 20 Can know the degree of economic change. Such an index is useful information in judgments such as replacement or addition of candidate devices.

In addition, on the display of the portable terminal 50, a graph 53 showing the investment recovery year when additional equipment is installed at the present time is displayed. In this case, the information output unit 14 includes an index (more specifically, information for displaying the graph 53) indicating the economic efficiency expected when a PV panel (candidate device) is additionally introduced to the customer 20. Output presentation information. In the example of FIG. 9, along with the graph 53, the self-consumption rate and how much the area and efficiency are improved by the additional introduction are also displayed.

Thus, by displaying the index (graph 53) indicating the economic efficiency expected when the PV panel (candidate equipment) is additionally introduced to the consumer 20, the resident of the consumer 20 can You can know the degree of improvement. Such an index is useful information in judgments such as replacement or addition of candidate devices.

The message 54 is also displayed on the display of the portable terminal 50. The message 54 displays a message indicating that the type of candidate device (device information of the candidate device. Here, it is displayed as a PV panel) and that the investment recovery period will be shortened due to the additional introduction of the candidate device. . In the example of FIG. 9, the difference between the first investment recovery year and the third investment recovery year, that is, how much the investment recovery year is shortened is also displayed. That is, information for performing such display is also included in the presentation information.

Further,

screen transition buttons

56 and 57 are also displayed on the display of the portable terminal 50. When a resident of the customer 20 presses the screen transition button 56, a purchase screen is displayed on the display of the portable terminal 50. On the purchase screen, more detailed specifications (equipment information of candidate devices, specifically price, model number, etc.), delivery date, etc. of the PV panel shown in the improvement plan are displayed. Information for displaying such a purchase screen is also included in the presentation information.

In addition, when the resident of the customer 20 presses the screen transition button 57, another improvement plan different from the currently displayed improvement plan is displayed. That is, when the screen transition button is pressed, the candidate device is changed and the trial calculation is performed again (or another improvement plan that has already been calculated is displayed).

Note that the information displayed on the display of the portable terminal 50 is not limited to the example of FIG. For example, the investment recovery year may be displayed as a number on the display of the portable terminal 50, or the power sale rate, the private power consumption unit price, the power sale unit price, and the like used for the trial calculation may be displayed. In other words, information for performing such display may be included in the presentation information.

[Effects]
As described above, the power management apparatus 10 according to the first embodiment presents the presentation information including the device information of the candidate device to the consumer 20 according to the change in the power usage state. More specifically, the information output unit 14 calculates an index indicating the economic efficiency expected at the first time point based on the acquired first information and the acquired information on the specific device. Based on the obtained second information and the acquired information on the specific device, an index indicating the economic efficiency expected at the second time point is calculated. Then, the information output unit 14 compares the index indicating the economics expected at the calculated first time point and the index indicating the economics expected at the calculated second time point, A trial calculation is made when it is judged that the index indicating economic efficiency is worsening.

In the above estimation, the information output unit 14 further calculates an index indicating the economic efficiency expected when the candidate device is introduced into the consumer 20. When the information output unit 14 determines that the calculated economic index is improved from the economic index expected at the second time point, the information output unit 14 includes the device information of the candidate device. Output information.

Thereby, the resident of the consumer 20 can make a judgment such as replacement or addition of candidate devices in consideration of device information of candidate devices to be introduced in order to improve economy.

In the embodiment described above, the investment recovery year is exemplified as an index indicating economic efficiency, but the index indicating economic efficiency is not particularly limited. For example, the index indicating economic efficiency may be ROI (Return On On Investment).

[Modification]
In the above embodiment, the information output unit 14 calculates the investment recovery year (an index indicating economic efficiency). For example, when the power management apparatus 10 is managed by the manufacturer of a specific device, the information output unit 14 calculates the investment recovery year. There may be cases where information on the year of return on investment remains in the history. In such a case, the first acquisition unit 11 acquires the investment recovery year at the first time as the first information from the storage unit 15 or the like, and the information output unit 14 calculates only the expected investment recovery year at the present time. May be. That is, the “information related to the power usage status” includes information (for example, investment recovery year) calculated based on the power usage status.

The investment payback year may be calculated by another device (external server or the like). In such a case, the first acquisition unit 11 acquires the investment payback year at the first time point from the external server, and The second acquisition unit 12 may acquire the investment recovery year at the second time point from an external server.

In the above-described embodiment, as the second information, the power generation amount, the personal consumption rate, the power sale rate, the current private power consumption unit price and the power sale unit price based on the actual measurement of the current power measurement device 200 are obtained. Although used, the second information includes a predicted value.

For example, such information may be used as the second information when it is known that the power consumption unit price and the power sale unit price will change in the future. Such a predicted value may be provided, for example, from a server or the like managed by the power company, or may be input by the administrator of the power management apparatus 10 through the UI.

Further, the power management apparatus 10 may calculate a predicted value using the environment information 66 described with reference to FIG. 3 and information 65 related to lifestyle, and may calculate an investment recovery year based on the calculated predicted value.

For example, in the above embodiment, the annual predicted power generation amount is calculated based on the actual measurement value measured by the power measurement device 200. However, the annual predicted power generation amount is the amount of solar radiation included in the environmental information 66 and the power generation efficiency of the PV panel 40 provided in the consumer 20 (the power generation efficiency in this case is, for example, a catalog included in the information 61 on the specific device) The power generation amount predicted based on the spec) may be used.

Further, for example, the self-consumption rate may be predicted based on the family structure included in the information 65 on the lifestyle. For example, when the increase / decrease in the number of people residing in the consumer 20 is known in advance, the predicted value of the self-consumption rate can be obtained by such an increase / decrease in the number of people.

Note that the environment information 66 and the lifestyle-related information 65 are typically input through the portable terminal 50. However, for example, when such information exists in the storage unit 15 or a server other than the power management apparatus 10 (for example, a server that manages weather information or a server that is managed by an electric power company), the storage unit 15 and information may be acquired from such a server.

(Other embodiments, etc.)
Although the power management apparatus 10 according to the embodiment has been described above, the present invention is not limited to the above embodiment.

For example, in the above-described embodiment, a consumer who is an object of information presentation is provided with a PV panel and no power storage device, but the consumer is provided with at least one of a PV panel and a power storage device. It only has to be.

In the above embodiment, PV panels, storage batteries, EVs, etc. are exemplified as candidate devices. Here, the candidate device may be a device having a power storage function or a power generation function, and a fuel cell system or a PV panel system including both a PV panel and a power storage device (the power storage device stores the generated power of the PV panel). System) is also included in the candidate device.

Moreover, in the said embodiment, although the power management apparatus 10 selected candidate apparatus, the kind (PV panel or storage battery) of candidate apparatus may be designated through a portable terminal. Thereby, the resident of a consumer can consider introduction of a desired device.

In addition, “introduction of equipment” in the above embodiment includes both cases where equipment is purchased and equipment is leased. That is, the present invention is applicable to both the case of proposing the purchase of a candidate device and the case of proposing a lease for the candidate device.

In the above embodiment, the power management apparatus is realized as a server apparatus. However, the present invention may be realized as a HEMS controller having the same function as the power management apparatus. Moreover, a part of function of the power management apparatus may be realized as a HEMS controller.

In the above embodiment, the resident of the customer inputs information from the mobile terminal, and the information presentation screen and the purchase screen based on the presentation information are displayed on the display of the mobile terminal. However, a device that inputs information and a device that displays an information presentation screen and a purchase screen may be different devices.

In the above embodiment, the power management apparatus acquires the power usage pattern from the HEMS controller. However, when the power measurement apparatus is an apparatus having a communication function such as a smart meter, the power management apparatus uses the power usage pattern. May be obtained from the power measuring device. Further, the power measurement device and the HEMS controller may be configured as an integrated device.

Further, in the first embodiment, the power management apparatus is intended for a customer provided with a HEMS composed of devices installed in a house. However, the power management apparatus may be intended for a consumer provided with BEMS (Building Energy Management System) in a building, FEMS (Factory Energy Management System) in a factory, and the like.

In the above embodiment, each component may be configured by dedicated hardware or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.

Each component may be a circuit. These circuits may constitute one circuit as a whole, or may be separate circuits. Each of these circuits may be a general-purpose circuit or a dedicated circuit.

In the above embodiment, another processing unit may execute a process executed by a specific processing unit. Further, the order of the plurality of processes may be changed, and the plurality of processes may be executed in parallel.

The comprehensive or specific aspect of the present invention may be realized by a recording medium such as a system, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. The comprehensive or specific aspect of the present invention may be realized by any combination of a system, a method, an integrated circuit, a computer program, or a recording medium.

As mentioned above, although the power management apparatus which concerns on one or several aspect was demonstrated based on embodiment, this invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

For example, the present invention may be realized as an information presentation method using the power management apparatus (the information presentation process described above).

DESCRIPTION OF SYMBOLS 10 Power management apparatus 11 1st acquisition part 12 2nd acquisition part 13 Equipment information acquisition part 14 Information output part 64 Equipment information 70 of candidate apparatus 70 Presentation information

Claims

A first acquisition unit that acquires first information related to the usage state of power of a consumer in which a specific device having a power generation function or a power storage function is introduced at a first time point;
A second acquisition unit that acquires second information related to the power usage status of the customer at a second time point after the first time point;
A device information acquisition unit that acquires device information of a candidate device that is a device different from the specific device and has a power generation function or a power storage function, which is a candidate to be introduced to the consumer;
An information output unit that outputs presentation information including device information of the candidate device in response to a change in power usage obtained by comparing the acquired first information and the second information. apparatus.
The device information acquisition unit further acquires information on the specific device,
The information output unit includes:
Based on the acquired first information and the acquired information on the specific device, a first index that is an index indicating economic efficiency expected at the first time point is calculated,
Based on the acquired second information and the acquired information on the specific device, a second index that is an index indicating economic efficiency expected at the second time point is calculated,
The calculated first index and the calculated second index are compared, and the presentation information is output when it is determined that the second index is worse than the first index. The power management apparatus described.
The specific device has a power generation function,
The first information includes the consumer's own consumption rate, the consumer's power sale rate, the consumer's power consumption unit price, the power sale unit price, and the power generation amount of the specific device at the first time point. ,
The second information includes the consumer's own consumption rate, the consumer's power sale rate, the consumer's power consumption unit price, the power sale unit price, and the power generation amount of the specific device at the second time point. ,
The information regarding the specific device includes an installation price of the specific device,
The information output unit calculates an investment recovery year of the specific device as an index indicating the economic efficiency, and an expected investment recovery year at the second time point is an expected investment recovery year at the first time point. The power management apparatus according to claim 2, wherein the presentation information is output when it is determined that the information is longer than a predetermined value.
When the information output unit determines that the second index is worse than the first index, the information output unit further calculates an index indicating economics expected when the candidate device is introduced to the consumer. When it is determined that the calculated economic index is better than the economic index expected at the second time point, the presentation information including the device information of the candidate device is output. The power management apparatus according to claim 2 or 3.
The power management apparatus according to claim 4, wherein the information output unit outputs the presentation information further including an index indicating economic efficiency expected when the candidate device is introduced to the consumer.
6. The power management apparatus according to claim 2, wherein the information output unit outputs the presentation information further including the calculated first index and the calculated second index.
The first information includes a self-consumption rate of the consumer at the first time point,
The second information includes the consumer's self-consumption rate, the self-consumption power unit price, and the power sale unit price at the second time point,
The information output unit compares the acquired first information and the second information so that the self-consumption rate at the second time point is smaller than the self-consumption rate at the first time point, and The presentation information including device information of the candidate device having a power generation function is output when it is determined that the unit power consumption unit price is lower than the unit power sale unit price at the second time point. The power management device described in 1.
The specific device has a power generation function,
The first information includes the power generation amount of the specific device at the first time point,
The second information includes the power generation amount of the specific device at the second time point,
The information output unit compares the acquired first information and the second information so that the power generation amount of the specific device at the second time point is the power generation amount of the specific device at the first time point. The power management apparatus according to any one of claims 1 to 7, wherein when the power management apparatus determines that the display information is smaller than, the presentation information including device information of the candidate device having a power generation function is output.
The first information includes a self-consumption rate of the consumer at the first time point,
The second information includes the consumer's self-consumption rate, the self-consumption power unit price, and the power sale unit price at the second time point,
The information output unit compares the acquired first information and the second information so that the self-consumption rate at the second time point is greater than the self-consumption rate at the first time point, and The presentation information including device information of the candidate device having a power storage function is output when it is determined that the unit power consumption unit price is higher than the unit power sale unit price at the second time point. The power management device described in 1.
An information presentation method using a power management device,
A first acquisition step of acquiring first information related to the usage state of power of a consumer into which a specific device having a power generation function or a power storage function is introduced at a first time point;
A second acquisition step of acquiring second information related to the power usage status of the customer at a second time point after the first time point;
A device information acquisition step of acquiring device information of a candidate device that is a device different from the specific device that is a candidate to be introduced to the consumer and that has a power generation function or a power storage function;
An information output step of outputting presentation information including device information of the candidate device in accordance with a change in power usage obtained by comparing the acquired first information and the second information. Method.
A program for causing a computer to execute the information presentation method according to claim 10.