Power management device, power management system, power management method, and power management program

Abstract

To provide an electric power management device capable of creating a supply and demand plan capable of achieving a target of a renewable energy ratio.SOLUTION: A central device 1 being an electric power management device includes a plan creation unit 13 that creates an electric power supply and demand plan by dividing each of supplied electric power and consumed electric power into renewable energy and non-renewable energy and determining them as variables so as to satisfy a target value, using a target value for a ratio of renewable energy to electric power consumed by a demander, a predicted value of electric power demand, a predicted value of an electric power generation amount by renewable energy, and a ratio of renewable energy for each fund of the supplied electric power.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a power management device, a power management system, a power management method, and a power management program that manage power. [Background technology]

[0002] Non-fossil fuel energy sources have two values: electricity and environmental value. With the progress of global decarbonization, there is a growing need to procure electricity with environmental value attached. For example, in April 2016, the Act on the Advancement of Energy Supply Structure (Energy Advancement Act) was amended to require retail electricity suppliers selling more than 500 million kWh of electricity per year to achieve a non-fossil fuel energy ratio of at least 44% by fiscal year 2030. Furthermore, initiatives such as RE100 (Renewable Energy 100%), an international initiative that aims for companies to cover their business electricity consumption with 100% renewable energy (hereafter referred to as "renewable energy"), are being promoted. In response to the growing need for environmental value, systems for trading environmental value, such as the non-fossil fuel value trading market and the J-Credit Scheme, have been established, allowing retail electricity suppliers and consumers to buy and sell environmental value. However, procuring more environmental value than necessary incurs unnecessary costs, and procuring insufficient environmental value will prevent them from achieving their renewable energy targets. For this reason, retail electricity suppliers and consumers need a system to properly manage the environmental value of electricity.

[0003] Patent Document 1 discloses a technology for a retail electricity supplier that manages both generators that generate electricity using renewable energy and generators that generate electricity using energy other than renewable energy, and that creates an operation plan for the generators so as to reduce both power generation costs and carbon dioxide emissions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-159624 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 creates an operation plan by searching for a solution that reduces power generation costs and carbon dioxide emissions. Therefore, depending on the conditions, the technology described in Patent Document 1 may not be able to achieve the target renewable energy ratio.

[0006] The present disclosure has been made in consideration of the above, and aims to provide a power management device that is capable of creating a supply and demand plan that can achieve a target renewable energy ratio. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the power management device according to the present disclosure includes: a target value of the ratio of renewable energy to the power consumed by a consumer; Consumer A forecast of electricity demand; Consumer The predicted amount of electricity generated by renewable energy sources, The amount of power generated by the power generation facilities of customers Renewable energy ratio and , the ratio of renewable energy to the amount of electricity supplied from electricity sellers to the distribution lines of consumers, and To meet the target value, The amount of electricity supplied from the business to the distribution line at the consumer and the amount of electricity supplied from the consumer's storage facility to the distribution line Power supplied amount and , the amount of energy consumed by the consumer load and the amount of energy used to charge the storage facility with a mix of renewable and non-renewable energy. and a plan creation unit that creates an electricity supply and demand plan by dividing the energy into renewable energy and non-renewable energy and determining them as variables. [Effects of the Invention]

[0008] The power management device according to the present disclosure has the effect of being able to create a supply and demand plan that can achieve a target renewable energy ratio. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of a facility to be managed by a power management system according to a first embodiment. [Figure 2]FIG. 1 shows an example of the configuration of a central device and a base device according to a first embodiment. [Figure 3] 1 is a flowchart showing an example of a supply and demand plan creation process procedure in the central device according to the first embodiment. [Figure 4] 1 is a flowchart showing an example of a sorting process according to the first embodiment. [Figure 5] FIG. 1 is a diagram showing a model of power exchange at a base according to the first embodiment. [Figure 6] FIG. 1 is a diagram showing a model of power exchange between bases to be managed according to the first embodiment. [Figure 7] 10 is a flowchart showing an example of a supply and demand plan creation process procedure when a target value is updated in the central device according to the first embodiment. [Figure 8] 1 is a flowchart showing an example of a procedure for setting an initial value of a weekly target value according to the first embodiment. [Figure 9] A flowchart showing an example of the process of setting a target value for the next week, which is the process of step S23 in the first embodiment. [Figure 10] FIG. 1 is a diagram showing an example of the configuration of a computer system that realizes a central device according to a first embodiment. [Figure 11] FIG. 10 is a diagram illustrating a relationship between a base and an operator according to a second embodiment. [Figure 12] FIG. 10 is a diagram illustrating an example of the configuration of a central device and a base device according to a second embodiment. [Figure 13] 10 is a flowchart illustrating an example of a supply and demand plan creation procedure in a base device according to a second embodiment. [Figure 14] FIG. 12 is a diagram illustrating a relationship between a base and an operator according to a third embodiment. [Figure 15] FIG. 10 shows an example of the configuration of a central device and a base device according to a third embodiment. [Figure 16] 10 is a flowchart showing an example of a supply and demand plan creation process procedure in a base device according to a third embodiment. [Figure 17] FIG. 10 is a diagram showing another example of a method for determining a price signal according to the third embodiment. [Figure 18] FIG. 10 is a diagram showing a configuration example of a power resource management device according to a fourth embodiment. [Figure 19]FIG. 10 is a diagram showing an example of a display screen of a supply and demand plan created in the first to fourth embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0010] A power management apparatus, a power management system, a power management method, and a power management program according to embodiments will be described in detail below with reference to the accompanying drawings.

[0011] Embodiment 1 FIG. 1 is a diagram showing an example of a facility to be managed by a power management system according to a first embodiment. The power management system according to this embodiment manages the power of consumers having bases 3-1 to 3-M (M is an integer of 2 or more), which are examples of multiple bases. Hereinafter, when referring to each of the bases 3-1 to 3-M without distinguishing them individually, they will be referred to as base 3. In this embodiment, the consumers are, for example, companies, businesses, public organizations, etc., but are not limited to these and may be consumers having multiple bases 3.

[0012] In the example shown in Fig. 1, a renewable energy power generation facility 4-1, a non-renewable energy power generation facility 5-1, a load 6-1, and a power storage facility 7-1 are provided at base 3-1, a renewable energy power generation facility 4-2, a power storage facility 7-2, and a load 6-2 are provided at base 3-2, and a renewable energy power generation facility 4-NR, a non-renewable energy power generation facility 5-NNR, and a load 6-NL are provided at base 3-M. Although Fig. 1 shows an example in which M is 3 or more, as described above, M may be 2.

[0013] The renewable energy power generation facilities 4-1 to 4-NR are facilities that generate electricity using renewable energy, such as solar power generation facilities and wind power generation facilities. Hereinafter, when the renewable energy power generation facilities 4-1 to 4-NR are referred to without distinction, they will be referred to as renewable energy power generation facilities 4. NR indicates the total number of renewable energy power generation facilities 4 at the bases 3-1 to 3-M. The non-renewable energy power generation facilities 5-1 to 5-NNR are facilities that generate electricity using energy other than renewable energy, such as power generation facilities using diesel engines, gas turbines, gas engines, etc. Hereinafter, when the non-renewable energy power generation facilities 5-1 to 5-NNR are referred to without distinction, they will be referred to as non-renewable energy power generation facilities 5. NNR indicates the total number of non-renewable energy power generation facilities 5 at the bases 3-1 to 3-M. The specific power generation facilities of the renewable energy power generation facilities 4-1 to 4-NR and the non-renewable energy power generation facilities 5-1 to 5-NNR are not limited to these examples.

[0014] The power storage facilities 7-1 and 7-2 have storage batteries and charge and discharge the storage batteries. Although not shown in Fig. 1, other power storage facilities may be provided within the bases 3-1 to 3-M, and when the power storage facilities provided within the bases 3-1 to 3-M are not individually indicated, they will be referred to as power storage facilities 7.

[0015] Note that Figure 1 is just an example, and for example, a storage facility 7 may be installed at 3-M, or there may be a base 3 where a renewable energy power generation facility 4, a non-renewable energy power generation facility 5, and a storage facility 7 are not installed, and the number of renewable energy power generation facilities 4, non-renewable energy power generation facilities 5, and a storage facility 7 installed at each base 3 is not limited to the example shown in Figure 1.

[0016] Loads 6-1 to 6-NL are facilities that consume power. Hereinafter, when loads 6-1 to 6-NL are referred to without being individually distinguished, they will be referred to as loads 6. In FIG. 1, the facilities that consume power at one base 3 are collectively shown as loads 6, and each load 6 may be composed of multiple facilities within the same base 3. Furthermore, the bases 3-1 to 3-M may include bases 3 that only generate power, i.e., bases 3 that do not have loads 6. NL is the number of bases 3 out of the bases 3-1 to 3-M that have loads 6 installed. If loads 6 are installed at all of the bases 3-1 to 3-M, NL=M.

[0017] In Fig. 1, the renewable energy power generation equipment 4, non-renewable energy power generation equipment 5, load 6, and storage equipment 7 of each base 3 are connected to one line at the top, but the equipment of each base 3 may be connected to the same distribution line, or may be connected to different distribution lines for each base 3. Furthermore, bases 3-1 to 3-M may span multiple power transmission and distribution areas.

[0018] At each base 3, the load 6 at the same base 3 can consume the electricity generated or discharged within the base 3, and the electricity generated within the base 3 can be used to charge the power storage equipment 7. Also, at each base 3, the load 6 can consume the electricity purchased from a retail electricity supplier or the like, and the purchased electricity can be used to charge the power storage equipment 7. Furthermore, power can be shared between bases 3.

[0019] As shown in FIG. 1, base devices 2-1 to 2-M are provided at bases 3-1 to 3-M. Hereinafter, when the base devices 2-1 to 2-M are not distinguished from one another, they will be referred to as base device 2. The base device 2 manages facility information, which is information about facilities such as a renewable energy power generation facility 4, a non-renewable energy power generation facility 5, a load 6, and a power storage facility 7 within the corresponding base 3, and acquires actual values ​​of power generation and power consumption. The facility information includes, for example, the rated output of the renewable energy power generation facility 4, the rated output and power generation cost of the non-renewable energy power generation facility 5, the rated capacity of the power storage facility 7, and information indicating constraints related to the State of Charge (SOC). Furthermore, if there is any constraint on the power consumption of the load 6, the facility information may also include information indicating the constraint. The actual values ​​of power generation and power consumption may be measured values ​​from a smart meter or the like provided at each base 3, or may be measured values ​​from a power conditioning subsystem (PCS) in the renewable energy power generation facility 4 or other measuring devices.

[0020] The bases 3-1 to 3-M are connected to a central device 1, which is a power management device of this embodiment, via a communication network. Any network may be used as the communication network. The central device 1 creates a supply and demand plan for each base 3 that reduces the costs borne by consumers while achieving the consumer's renewable energy ratio target by managing the source of electricity separately as renewable energy and non-renewable energy. Based on the created supply and demand plan, the central device 1 determines control command values ​​for controlling each device (each facility) at each base 3 and transmits the control command values ​​to the base device 2. The supply and demand plan created by the central device 1 includes a power generation plan, a charging and discharging plan for the power storage facility 7, a power purchase plan, and a power sales plan for each base 3. The base device 2 controls each device (each facility) at the base 3 based on the control command values ​​received from the central device 1.

[0021] Fig. 2 is a diagram showing an example of the configuration of the central device 1 and the base device 2-1 according to this embodiment. As shown in Fig. 2, the base device 2-1 includes a transmitter / receiver 21, a facility information storage unit 22, a performance value acquisition unit 23, and an equipment control unit 24. Although not shown in Fig. 2, the configuration of the base devices 2-2 to 2-M is the same as that of the base device 2-1, and the operation of the base devices 2-2 to 2-M is also the same as that of the base device 2-1.

[0022] The equipment information storage unit 22 stores equipment information about the equipment within the base 3. The transmitter / receiver 21 communicates with other devices. For example, the transmitter / receiver 21 transmits the equipment information stored in the equipment information storage unit 22 to the central unit 1 and transmits the performance values ​​received from the performance value acquisition unit 23 to the central unit 1. The equipment information may be transmitted to the central unit 1 upon a request from the central unit 1. For example, the equipment information may be transmitted as part of a registration process before the central unit 1 creates an initial supply and demand plan, and thereafter transmitted to the central unit 1 whenever there is a change in the equipment information. Alternatively, the equipment information may be transmitted periodically, for example, monthly. The transmitter / receiver 21 also receives a control command value from the central unit 1 and outputs the received control command value to the equipment control unit 24. The equipment control unit 24 controls the equipment (facility) at the base 3 based on the control command value received from the transmitter / receiver 21.

[0023] The actual value acquiring unit 23 acquires actual values ​​of the amount of power generated and consumed within the base and outputs the acquired actual values ​​to the transceiver unit 21. As described above, the actual values ​​may be measured values ​​from a smart meter or the like, or may be values ​​measured by a PCS or other measuring device. The actual values ​​may be actual values ​​for each base 3 or for each device (facility). If the actual values ​​of the charge / discharge amounts of the power storage equipment 7 can be acquired, the actual values ​​may include the actual values ​​of the charge / discharge amounts of the power storage equipment 7. When there are missing actual values, the actual value acquiring unit 23 may calculate the actual value corresponding to the missing value using planned values ​​or other actual values. The base device 2-1 may include an actual value storage unit (not shown), and the actual value acquiring unit 23 may store the actual values ​​in the actual value storage unit. The transceiver unit 21 may transmit the actual values ​​stored in the actual value storage unit to the central device 1. As a result, for example, the transceiver unit 21 may transmit actual values ​​for one day, one week, or the like together to the central device 1.

[0024] In the example shown in FIG. 2, the power system includes a central device 1, base devices 2-1 to 2-M, a prediction device 31, a transaction support device 32, and a plan submission support device 33. The central device 1 transmits actual values ​​received from the base devices 2-1 to 2-M to the prediction device 31, and receives prediction results of power supply and demand, i.e., prediction results of demand (amount of power consumption), from the prediction device 31. The prediction device 31 predicts demand at each base and the amount of power generated by renewable energy (amount of renewable energy power generation) using the actual values ​​received from the central device 1, and transmits the prediction results to the central device 1. The prediction device 31 may use any prediction method. For example, the prediction device 31 may use an average of actual values ​​of demand for each time period on the same day of the week in the same season in the past as the predicted value, or may obtain temperature along with the actual values ​​and predict demand using the forecast value of the temperature. Furthermore, when predicting the amount of renewable energy power generation, the prediction device 31 may use the average value of the amount of power generation in each time period in the past as the predicted value, or may obtain the amount of solar radiation, weather forecast values, etc. along with the actual value and predict the amount of power generation using the solar radiation and weather forecast values. The prediction method in the prediction device 31 is not limited to these examples.

[0025] 2, the prediction device 31 is provided separately from the central device 1, but the central device 1 may also have the functions of the prediction device 31. That is, the central device 1 may have a prediction unit that predicts power supply and demand. Also, in FIG. 2, the prediction device 31 acquires actual values ​​from the base devices 2-1 to 2-M, but this is not limited thereto, and the prediction device 31 may acquire actual values ​​directly from the base devices 2-1 to 2-M. Also, in FIG. 2, the prediction device 31 predicts the power supply and demand of all the bases 3, but a prediction device 31 may be provided for each base 3, and the prediction device 31 may predict the power supply and demand of the corresponding base 3 and transmit the prediction results to the central device 1. In this case, the base device 2 may have the functions of the prediction device 31.

[0026] The central device 1 uses the power supply and demand forecast results received from the forecasting device 31 and the facility information received from the base devices 2-1 to 2-M to create a supply and demand plan for each base 3 that reduces the costs borne by consumers while achieving the consumer's renewable energy ratio target by managing the power resource separately into renewable energy and non-renewable energy, and transmits the created supply and demand plan to the plan submission support device 33. Based on the supply and demand plan received from the central device 1, the plan submission support device 33 creates a supply and demand plan to be submitted to a cross-regional organization (Organization for Cross-regional Coordination of Transmission Operators) that manages wide-area power across power transmission and distribution areas, and transmits the created supply and demand plan to the cross-regional organization system 35. Note that, although the cross-regional organization system 35 is set as the destination to which the supply and demand plan is submitted, the destination to which the supply and demand plan is submitted is not limited to the cross-regional organization system 35.

[0027] Furthermore, the central device 1 uses the created supply and demand plan to create an electricity trading plan, which is a plan for sales and procurement in the electricity trading market, and transmits the created electricity trading plan to the trading support device 32. The trading support device 32 performs bidding processing with the electricity market trading system 34 based on the trading plan received from the central device 1. The electricity market trading system 34 is a system that conducts transactions on, for example, the Japan Electric Power Exchange (JEPX), accepts bids, and performs contract processing based on the bids. The market in which electricity is traded is not limited to the Japan Electric Power Exchange. The trading support device 32 may also support bilateral electricity trading.

[0028] Furthermore, an environmental value procurement plan may be created using the created supply and demand plan, and the created environmental value procurement plan may be transmitted to an environmental value trading support system (not shown). The environmental value trading support system conducts transactions with an environmental value market system (not shown) that processes environmental value transactions. The environmental value trading support system may also support bilateral transactions of environmental values.

[0029] Note that the configuration shown in Figure 2 is an example, and the power system of this embodiment may not include one or more of the prediction device 31, trading support device 32, and plan submission support device 33 shown in Figure 2.

[0030] As shown in FIG. 2, the central device 1 includes a transmitter / receiver 11, an information storage unit 12, a plan creation unit 13, a plan storage unit 14, a command generation unit 15, and a sorting unit 16.

[0031] The transmitter / receiver 11 communicates with other devices. For example, the transmitter / receiver 11 receives performance values ​​from the base devices 2-2 to 2-M, stores the received performance values ​​in the information storage unit 12, and transmits them to the prediction device 31. The transmitter / receiver 11 also receives facility information from the base devices 2-2 to 2-M and stores the received facility information in the information storage unit 12. The transmitter / receiver 11 also receives prediction results of power supply and demand from the prediction device 31 and stores the received prediction results in the information storage unit 12. The transmitter / receiver 11 also transmits control command values ​​received from the command generation unit 15 to the corresponding base device 2. The transmitter / receiver 11 also transmits the supply and demand plan stored in the plan storage unit 14 to the plan submission support device 33 and transmits the trading plan stored in the plan storage unit 14 to the trading support device 32. The transmitter / receiver 11 also transmits the sorting results stored in the information storage unit 12 to the corresponding base device 2.

[0032] The information storage unit 12 stores the facility information received from the transmitter / receiver unit 11, the predicted results of power supply and demand, and the like. The information storage unit 12 also stores various information, described later, used to create a supply and demand plan. The plan creation unit 13 uses the target value for the renewable energy ratio, the predicted value for power demand, the predicted value for the amount of power generated by renewable energy, and the renewable energy ratio for each source of power supplied to create a power supply and demand plan by dividing the supplied power and the consumed power into renewable energy and non-renewable energy as variables so as to meet the target values. In detail, the plan creation unit 13 uses the information stored in the information storage unit 12 to manage the power source resources separately as renewable energy and non-renewable energy, thereby creating a supply and demand plan for each base 3 that achieves the renewable energy ratio target for each consumer while reducing the costs borne by the consumer, and stores the created supply and demand plan in the plan storage unit 14. The method for creating a supply and demand plan will be described in detail later. The supply and demand plan includes an electricity sales plan, an electricity procurement plan, an environmental value procurement plan, an electricity trading plan, an electricity interchange plan, a power generation plan, a charge and discharge plan for the electricity storage facility 7, etc. Furthermore, the plan creation unit 13 creates an electricity trading plan using the supply and demand plan, and stores the created electricity trading plan in the plan storage unit 13.

[0033] The command generation unit 15 generates control command values ​​for controlling the devices (facilities) at each base 3 based on the supply and demand plan stored in the plan storage unit 14, and outputs the generated control command values ​​to the transmission and reception unit 11. The control command values ​​include, for example, at least one of a command value for controlling the charging and discharging of the power storage facility 7, a command value for the power generation amount of the non-renewable energy power generation facility 5, and a command value for the power generation amount (output suppression) of the renewable energy power generation facility 4.

[0034] The sorting unit 16 uses the performance values ​​stored in the information storage unit 12 to sort the performance values ​​into renewable energy and non-renewable energy, and stores the sorting results for each base 3 in the information storage unit 12.

[0035] Next, the operation of this embodiment will be described. Fig. 3 is a flowchart showing an example of the supply and demand plan creation processing procedure in the central device 1 of this embodiment. First, the operation will be described when the creation target period, which is the target period for creating the supply and demand plan, is the same as the target setting period, which is the period for setting the target value of the renewable energy ratio to the electricity consumed by consumers. For example, this corresponds to a case where a target value for the renewable energy ratio for one year is set and a supply and demand plan for one year is created, or a case where a target value for the renewable energy ratio for one week is set and a supply and demand plan for one week is created.

[0036] As shown in Fig. 3, the central unit 1 determines whether it is time to create a plan (step S1). For example, the central unit 1 may determine that it is time to create a plan when an input means (not shown) receives an input of a plan creation instruction from an operator or the like. Alternatively, a supply and demand plan may be created for each fixed period, such as one day, one week, one month, or one year, and the central unit 1 may determine that it is time to create a plan each time the fixed period has passed. If it is not time to create a plan (No in step S1), the central unit 1 proceeds to step S5, which will be described later.

[0037] If it is time to create a plan (Yes in step S1), the central device 1 acquires input information (step S2). The input information is information used to calculate the objective function and set constraint conditions, which will be described later, and includes the results of forecasting power supply and demand corresponding to the target period for which the supply and demand plan is to be created, facility information, etc. In step S2, more specifically, the plan creation unit 13 acquires the input information by reading the input information from the information storage unit 12.

[0038] Next, the central device 1 creates a supply and demand plan (step S3). In detail, the plan creation unit 13 creates a supply and demand plan by determining each variable related to electricity so as to minimize an objective function indicating the consumer's costs or to make the objective function equal to or less than a threshold value under constraints including the achievement of the consumer's target renewable energy ratio, and stores the created supply and demand plan in the plan storage unit 14. The objective function and constraints will be described later. The plan creation unit 13 extracts the electricity trading plan and the environmental value procurement plan included in the supply and demand plan, creates the electricity trading plan and the environmental value procurement plan, and stores them in the plan creation unit 13.

[0039] Next, the central device 1 transmits the supply and demand plan (step S4). In detail, the transmitter / receiver 11 transmits the supply and demand plan for each base 3, among the supply and demand plans stored in the plan storage unit 14, to the corresponding base device 2. The transmitter / receiver 11 also transmits the supply and demand plan to the plan submission support device 33 and transmits the energy trading plan to the trading support device 32.

[0040] Next, the central unit 1 determines whether it is time to send a control command (step S5). For example, the central unit 1 transmits a control command to control equipment (facility) at each base 3 at a predetermined command transmission period, and the central unit 1 determines that it is time to send a control command each time a time corresponding to the predetermined command transmission period has elapsed. If it is not time to send a control command (step S5 No), the central unit 1 repeats the process from step S1.

[0041] If it is time to send a control command (Yes in step S5), the central device 1 calculates a control command value for each device (facility) at each base 3 based on the supply and demand plan (step S6). In detail, the command generation unit 15 generates a control command value for each device (facility) at each base 3 based on the supply and demand plan stored in the plan storage unit 14, and outputs the generated control command value to the transmission / reception unit 11.

[0042] Next, the central device 1 transmits the control command value (step S7) and repeats the process from step S1. In step S7, more specifically, the transmitter / receiver 11 transmits the control command value to the corresponding base device 2. Through the above process, a supply and demand plan is created.

[0043] 4 is a flowchart showing an example of the sorting process of this embodiment. The central device 1 determines whether or not it has acquired the performance values ​​of each device at each site 3 (step S11). In detail, the sorting unit 16 determines whether or not the performance values ​​of each device at each site 3 for the sorting target period have been stored in the information storage unit 12.

[0044] If the actual value of each device at each base 3 has not been acquired (step S11 No), the central unit 1 repeats step S11. If the actual value of each device at each base 3 has been acquired (step S11 Yes), the central unit 1 sorts the energy into renewable energy and non-renewable energy (step S12) and stores the sorting result (step S13). In detail, the sorting unit 16 sorts the electricity used to meet the demand of consumers into renewable energy and non-renewable energy using the actual values ​​of the power generation amount of each power generation facility and the amount of electricity purchased, which are stored in the information storage unit 12, and stores the sorting result for each base 3 in the information storage unit 12.

[0045] The central unit 1 determines whether it is time to transmit the sorting results (step S14), and if it is not time to transmit the sorting results (step S14 No), repeats the process from step S11. For example, the central unit 1 transmits the sorting results corresponding to each base 3 at a predetermined sorting result transmission period, and the central unit 1 determines that it is time to transmit the sorting results each time a time corresponding to the predetermined sorting result transmission period has elapsed. Alternatively, the central unit 1 may determine that it is time to transmit the sorting results when instructed by an operator or the like.

[0046] If it is time to transmit the sorting results (Yes in step S14), the central device 1 transmits the sorting results (step S15) and repeats the process from step S11. Specifically, in step S15, the transmitter / receiver 11 transmits the sorting results stored in the information storage unit 12 to the corresponding base device 2.

[0047] Next, the above-mentioned step S3 will be described in detail. FIG. 5 is a diagram showing a model of power exchange at a base 3 according to this embodiment. FIG. 5 shows an example in which a power generation facility, a power storage facility 7, and a load 6 are provided at one base 3. In FIG. 5, the dashed-dotted line indicates a mixture of renewable energy (electricity generated by renewable energy) and non-renewable energy (electricity generated by non-renewable energy), the solid arrow indicates non-renewable energy, and the dashed line indicates renewable energy. As shown in FIG. 5, the power supplied to a customer's base 3 includes at least one of power generated by the customer's power generation facility, power discharged from the customer's power storage facility 7, and purchased power. Furthermore, the power consumed by the customer includes at least one of power consumed by the customer's load 6 and power charging the customer's power storage facility 7.

[0048] The power generation facility shown in FIG. 5 is, for example, either a renewable energy power generation facility 4 or a non-renewable energy power generation facility 5, but is not limited thereto and may be a power generation facility that generates power from both renewable energy and non-renewable energy. The power generation amount Pgen is the total amount of power generated by one power generation facility. α is the renewable energy ratio for each power generation facility, Pgen(RE) is the amount of power generated by renewable energy within Pgen, and Pgen(NRE) is the amount of power generated by non-renewable energy within Pgen. In a base 3 where multiple power generation facilities are installed, Pgen and α are determined for each power generation facility. Also, for example, in the case of a renewable energy power generation facility 4 that generates power only from renewable energy, α is 1, and in the case of a non-renewable energy power generation facility 5 that generates power only from non-renewable energy, α is 0. However, α may be any value between 0 and 1, and is determined according to the renewable energy ratio of the power generation facility.

[0049] Pbuy is the amount of electricity purchased from a retail electricity supplier, etc. β is the renewable energy ratio in Pbuy. For β, for example, the value provided by the electricity seller can be used. Pbuy(RE) is the amount of electricity generated by renewable energy in Pbuy, and Pbuy(NRE) is the amount of electricity generated by non-renewable energy in Pbuy.

[0050] Pchr(RE) is the renewable energy portion of the amount of power charged to the power storage facility 7, and Pchr(NRE) is the non-renewable energy portion of the amount of power charged to the power storage facility 7. Pdis(RE) is the renewable energy portion of the amount of power discharged from the power storage facility 7, and Pdis(NRE) is the non-renewable energy portion of the amount of power discharged from the power storage facility 7. Note that the power storage facility 7 is charged with a mixture of renewable and non-renewable energy, and therefore the proportion of renewable energy in the amount of power charged to the power storage facility 7 cannot be determined even when considering the power storage facility 7 alone. However, as shown in Figure 5, by managing all of the electricity resources used to charge the power storage facility 7 separately as renewable energy and non-renewable energy, the amount of power charged can be managed separately as renewable energy and non-renewable energy. Then, the amount of electricity stored in the power storage facility 7 is divided into renewable energy and non-renewable energy, and managed as an integrated amount of discharged electricity for each time period, thereby making it possible to determine the renewable energy ratio of the amount of electricity stored in the power storage facility 7. This also makes it possible to manage the renewable energy ratio of the amount of electricity discharged when the power storage facility 7 is discharged.

[0051] L is the amount of electricity consumed by the load 6, L(RE) is the renewable energy portion of L, and L(NRE) is the non-renewable energy portion of L. As with charging the storage battery facility 7, the ratio of renewable and non-renewable energy for the load 6 alone cannot be determined, but the renewable energy ratio of L can be managed by dividing all of the electricity resources into renewable and non-renewable energy and managing them separately.

[0052] Psur(RE) is the amount of electricity to be reversed, i.e., the renewable energy portion of the amount of electricity to be sold to retail electricity suppliers, etc., and Psur(NRE) is the non-renewable energy portion of the amount of electricity to be reversed. The ratio between Psur(RE) and Psur(NRE) can also be determined by managing the source of electricity.

[0053] Pout(RE) is the renewable energy portion of the amount of interchange power transmitted to other bases 3 for interchange, and Pout(NRE) is the non-renewable energy portion of the amount of interchange power transmitted to other bases 3 for interchange. Pin(RE) is the renewable energy portion of the amount of interchange power received by being interchanged from other bases 3, and Pin(NRE) is the non-renewable energy portion of the amount of interchange power received by being interchanged from other bases 3. The ratio between Pout(RE) and Pout(NRE) can also be determined by managing the source of power. The ratio between Pin(RE) and Pin(NRE) can also be determined by managing the source of power from the interchange source.

[0054] In the model shown in Figure 5, power generation equipment and storage equipment 7 are installed at base 3, but this does not limit the equipment installed at base 3.A common model can be applied by setting the amount of electricity for equipment that is not installed at each power generation equipment base 3 to 0 depending on the equipment.

[0055] Fig. 6 is a diagram showing a model of the exchange of power between bases 3 to be managed in this embodiment. The power generation facilities shown on the left side of Fig. 6 are modeled as one power generation facility for each base 3, namely, bases #1 to #M, i.e., bases 3-1 to 3-M. In the example shown in Fig. 6, of bases 3-1 to 3-M, bases 3-1 to 3-K belong to power transmission and distribution area A1, and of bases 3-1 to 3-M, bases 3-P (P=K+1) to 3-M belong to power transmission and distribution area A2. Also, in Fig. 6, as in Fig. 5, the dashed-dotted line indicates a mix of renewable energy and non-renewable energy, the solid arrow indicates non-renewable energy, and the dashed line indicates renewable energy.

[0056] When power is exchanged between bases 3, as shown in Figure 6, electricity generated by a power generation facility at one base 3 (Pout(RE) and Pout(NRE)) is transferred to another base 3 via the power generation BG (Balancing Group) to which the base 3 belongs and the retail BG to which the base 3 belongs. The electricity is then transmitted to the destination base 3 (listed on the right) and consumed by the load 6 at the destination base 3. While Figure 6 illustrates the load 6, the power storage facility 7 is also used to charge the storage facility 7 at the base 3. Pout(RE) and Pout(NRE) are transported to the base 3 via the transmission and distribution network operated by the power generation BG operator and the transmission and distribution network operated by the retail BG operator. However, losses occur between the generation end and the transmission end of Pout(RE) and Pout(NRE). This loss is designated as loss rate #1. Similarly, losses occur between the transmission end and the receiving end. This loss is designated as loss rate #2. In Figure 6, the renewable energy portion of the amount of electricity sent from the power generation BG to the retail BG is represented as Pop(RE), and the non-renewable energy portion of the amount of electricity sent from the power generation BG to the retail BG is represented as Pop(NRE).

[0057] In the example shown in Fig. 6, since bases 3-1 to 3-M are distributed across multiple power transmission and distribution areas, the exchange of power between the power transmission and distribution areas is subject to market trading. That is, the amount of power between the power transmission and distribution areas is procured and sold through trading in the power trading market. Furthermore, the exchange of power within the same power transmission and distribution area may also be procured and sold through trading in the power trading market. Furthermore, both the exchange of power between power transmission and distribution areas and the exchange of power within the same power transmission and distribution area may not be subject to trading in the power trading market.

[0058] Also, because the interconnection points of bases 3-1 to 3-M are both power generation ends and power receiving ends, Fig. 6 also includes a combination in which the power generation equipment on the left end and the load 6 on the right end are located within the same base 3, but exchanges within the same base 3 are not treated as power interchange. Note that Fig. 6 shows an example in which base 3 belongs to a power generation BG and a retail BG, but base 3 does not have to belong to a power generation BG or a retail BG.

[0059] An example of a method for creating a supply and demand plan in the plan creation unit 13 will be described using the model illustrated in Fig. 5 and Fig. 6. The cost incurred by the consumer at the I-th base 3, base 3-I, can be expressed by the following formula (1). Note that the following formulas (1), (3) to (15), and (20) are constraint formulas for each base, but in some formulas, the letter i indicating the base is omitted.

[0060]

number

[0061] Let t be the time (date and time) discretized into each unit of time, t=1 for the start of the target period, and t=end for the end of the target period. The subscript t indicates the value at t. NG I is the number of power generation facilities at the I-th site 3, and Pgen t,p indicates the power generation amount of the pth power generation facility at time t. Pin_ifromJ(RE) t is the renewable energy portion of the power interchange amount from the J-th (I≠J)-th site 3 that the I-th site 3 receives power at time t, and Pin_ifromJ(NRE) t is the non-renewable energy portion of the power interchange amount from the Jth base 3 that the Ith base 3 receives power at time t, and J ranges from A to C. Also, the wheeling charge at time t is the wheeling charge t It states that:

[0062] λ(RE) t is the unit price of renewable energy power interchange at time t, and λ(NRE) t is the unit price of non-renewable energy power interchange at time t. Pout_kfromI(RE) t is the renewable energy portion of the electricity interchange from the I-th site 3 to the k-th site 3 at time t, and Pout_kfromI(NRE) t is the non-renewable energy portion of the electricity interchange amount from the I-th base 3 to the k-th base 3 at t (I ≠ k), where k ranges from a to c. Also, the surplus imbalance unit price tis the unit price of the surplus imbalance charge obtained by selling surplus electricity at t, and Psur t is the sum of the renewable and non-renewable energy portions of the surplus electricity (reverse power flow) at time t. The non-fossil certificate unit price is the unit price of the certificate when purchasing environmental value as a certificate, and CER is the amount of electricity for which environmental value can be obtained through the certificate. Electricity rate t is the unit price of purchased electricity at time t.

[0063] Formula (1) is the cost for one base 3, and the cost shown in formula (1) is calculated as CP I Then, CP from I=1 to I=M I ΣCP, which is the sum of I The cost of the customer is calculated by adding the cost of the operation of all the bases 3 shown in the following formula (2) to the cost of the customer. I The objective function is the sum of the operational cost (cost required for operating the power exchange) shown in the following formula (2), and each variable that minimizes the objective function is calculated. Note that here, an example is shown in which a JEPX fee is charged as a trading fee in the energy trading market, but the energy trading market is not limited to JEPX, and any fee from the energy trading market can be used. The settlement amount for the difference between λ of the consignor and the recipient is the sum of the value shown in formula (15) and the value shown in formula (16), which will be described later. In energy exchange, the recipient bears the costs, but the unit price for energy exchange is set lower at the recipient's unit price than the unit price paid to the consignor, and this difference becomes the profit of the operator managing the energy exchange. Therefore, the value obtained by subtracting the unit price of the recipient from the unit price of the consignor (a negative value) is added as the difference.

[0064]

number

[0065] The plan creation unit 13 calculates each variable that minimizes the objective function under the constraint conditions shown in equations (3) to (14) described later. Equations (3) to (12) represent constraint equations for each base 3, and equations (13) and (14) represent constraint equations for all consumers. NG in equations (3) to (12) represents the above-mentioned NG I The method of calculating each variable that minimizes the above-mentioned objective function can be a general solution method for optimization problems, but any method can be used. For example, the steepest descent method, Newton's method, metaheuristics, etc. can be used, but are not limited to these.

[0066] The following equation (3) shows the constraints on the supply and demand balance of renewable energy.

[0067]

number

[0068] The following equation (4) shows the constraints on the supply and demand balance of non-renewable energy.

[0069]

number

[0070] The following formula (5) shows the constraint on the overall supply and demand balance. Note that with regard to the above formulas (3) to (5), the above formulas (3) and (4) may be used as the constraint formulas, or the above formulas (3) and (5) may be used as the constraint formulas, or the above formulas (4) and (5) may be used as the constraint formulas.

[0071]

number

[0072] The following formula (6) represents the surplus power.

[0073]

number

[0074] The following formula (7) shows the constraints on carbon dioxide emissions and is applied when a consumer sets a target value for carbon dioxide emissions. CO2goal is the consumer's target value for carbon dioxide emissions. Emission factor #1 is the carbon dioxide emission factor corresponding to the purchased electricity and is set for each retail electricity supplier. Emission factor #2 is set according to the fuel, and emission factor #3 is the carbon dioxide emission factor corresponding to the CER and is set according to the system corresponding to the certificate. Emission factor #2 differs depending on the fuel.

[0075]

number

[0076] The following equation (8) is a constraint on the target value of the renewable energy ratio of the consumer, and is a constraint equation applied to achieve the target value of the renewable energy ratio of the consumer. γ is the target value of the renewable energy ratio of the consumer. Note that here, the target value of the renewable energy ratio is met for each base 3, but depending on the method of setting the consumer's target, the constraint equation may be set so that the total of all bases 3 meets the target value of the renewable energy ratio. Note that L(RE) t +L(NRE) t is a fixed value determined by the demand forecast results.

[0077]

number

[0078] The following equation (9) shows the constraint on carbon dioxide emissions per unit time.

[0079]

number

[0080] The following equation (10) shows the constraint on the renewable energy ratio per unit time.

[0081]

number

[0082] The following formula (11) shows the constraint on the SOC of the power storage facility 7. SOC(RE) t indicates the SOC of renewable energy at time t, and SOC(NRE) t indicates the SOC for the non-renewable energy portion at time t. In this embodiment, the SOC is divided into the renewable energy portion and the non-renewable energy portion according to the ratio of the power resource at each base 3, and therefore the SOC is also managed separately into the renewable energy portion and the non-renewable energy portion.

[0083]

number

[0084] The following formula (12) shows the constraints on the charge / discharge power of the power storage facility 7.

[0085]

number

[0086] The following formula (13) represents the constraint on the SOC of the power storage facility 7 at the end of the target period. SOC(RE) const ,SOC(NRE) const are predetermined values. The initial values ​​of SOC(RE) and SOC(NRE), i.e., the values ​​at t=1, are, for example, SOC(RE) const ,SOC(NRE) const Alternatively, it may be set to a different value based on information acquired from the base device 2 at each base 3.

[0087]

number

[0088] In addition, SOC(RE) const ,SOC(NRE) const Instead, the total SOC of renewable energy and non-renewable energyconst may be determined in advance, and the following equation (14) may be used as a constraint equation instead of equation (13).

[0089]

number

[0090] The following formula (15) shows the constraints on the power generation capacity of each generator. Furthermore, with regard to the renewable energy power generation facility 4, the predicted value of the renewable energy power generation amount may be treated as a fixed value, or may be treated as a variable with the predicted value of the renewable energy power generation amount as the upper limit in consideration of output suppression. In this case, the minimum power generation amount in the following formula (15) t,p is 0, and the maximum power generation t,p is the predicted amount of renewable energy power generation.

[0091]

number

[0092] The following equation (16) shows the constraints on the supply and demand balance for renewable energy, taking into account the power interchange between bases 3.

[0093]

number

[0094] The following equation (17) shows the constraints on the supply and demand balance for non-renewable energy, taking into account the power interchange between bases 3.

[0095]

number

[0096] As described above, the following formulas (18) and (19) show the settlement amount of the difference between λ of the consignment source and the consignment destination divided into the renewable energy portion and the non-renewable energy portion.

[0097]

number

[0098]

number

[0099] The following equation (20) is a constraint equation for the balance between the source and destination of the supply (for each base 3).

[0100]

number

[0101] Pgen, which is each variable that minimizes the objective function under the constraint equations described above t,p , Pin_ifromJ(RE) t , Pin_ifromJ(NRE) t , Pout_kfromI(NRE) t , Pout_kfromI(RE) t , L(RE) t , L(NRE) t , Pbuy(RE) t , Pbuy(NRE) t , Pchr(RE) t , Pchr(NRE) t , Pdis(RE) t , Pdis(NRE) t , SOC(RE) t , SOC(NRE) t By determining the CER, a supply and demand plan can be created. The various unit prices used in the above constraints other than these variables, SOC(NRE) const are stored in advance as input information in the information storage unit 12. These pieces of information may be transmitted from the base device 2, may be input to the central device 1 by an operator, or may be transmitted from another device (not shown) and received by the central device 1, and stored in the information storage unit 12. t =L(RE) t +L(NRE) tThe predicted demand result is used as the demand forecast, and as described above, this forecast result is also stored as part of the input information in the information storage unit 12. As described above, the predicted value of the renewable energy power generation amount may be treated as a fixed value and used as input information, or may be treated as a variable with the predicted value of the renewable energy power generation amount as the upper limit in consideration of output suppression, as described above.

[0102] In the above example, four constraint equations (7) to (10) are considered regarding the renewable energy ratio and carbon dioxide emissions, but it is not necessary to use all of these constraint equations; one or more of the four may be used depending on the target at each base. In addition, in the above constraint equations, a renewable energy ratio γ is set for each base 3, but if it is sufficient to satisfy the renewable energy ratio γ overall, a constraint equation that satisfies the renewable energy ratio γ overall is used instead of the constraint equation for each base 3.

[0103] Furthermore, for power interchange between bases, if there are constraints for each base, constraints for each combination of the power source and the power destination, etc., these constraints are also taken into account as constraint equations. Also, constraints on power interchange may be taken into account for each group made up of multiple bases 3. For example, since constraints on interconnection lines between power transmission and distribution areas may occur, bases 3 in the same power transmission and distribution area may be grouped together, and a constraint equation may be determined for each group.

[0104] As described above, the central device 1 of this embodiment manages multiple customer bases, and the plan creation unit 13 creates a supply and demand plan that includes the amount of power to be exchanged between the supply and demand planning bases 3. The plan creation unit 13 also determines the amount of power to be exchanged by dividing it into renewable energy and non-renewable energy. The plan creation unit 13 also creates a supply and demand plan so that the sum of the costs at the multiple bases 3 and the costs required for power exchange is equal to or less than a threshold value.

[0105] Next, an example will be described in which the target setting period for the renewable energy ratio differs from the period for which the supply and demand plan is created. The target setting period for the renewable energy ratio may be longer than the period for which the supply and demand plan is created. Consider a case in which the target setting period for the renewable energy ratio is one year, but the supply and demand plan is created every week. While the target setting period and the period for which the plan is created are not limited to this example, the following describes an example in which the target setting period for the renewable energy ratio is one year, but the supply and demand plan is created every week. In this case, the target value for the renewable energy ratio for each week is first set based on the target value for the renewable energy ratio for one year. A supply and demand plan may be created using the initially set target value, but the planned value and the actual value may not match, and the amount of power generation may change due to changes in the equipment at each base 3, etc. For this reason, the target value for the renewable energy ratio for each week may be updated based on the actual value, as described below.

[0106] 7 is a flowchart showing an example of a supply and demand plan creation processing procedure when the target value in the central device 1 of this embodiment is updated. First, the central device 1 sets a weekly target value (step S21). In detail, the plan creation unit 13 sets initial values ​​of weekly target values, which are target values ​​of the renewable energy ratio for each week, for one year based on the target value of the renewable energy ratio for the year. At this time, if the start day of the week for the weekly supply and demand plan is specified, the creation target period is adjusted so that a weekly supply and demand plan starting on the specified day of the week is created for weeks that straddle fiscal years.

[0107] 8 is a flowchart showing an example of a procedure for setting an initial value of the weekly target value in this embodiment. The plan creation unit 13 of the central device 1 first sets the target value of the renewable energy ratio to 0 (step S31), and calculates the renewable energy ratio for each week (step S32). In detail, γ in equation (9) is set to 0, and as described above, a supply and demand plan for each week for one year is obtained so as to minimize the objective function under the constraint conditions, and the renewable energy ratio for each week is calculated based on the obtained supply and demand plan, that is, the left side of equation (7) is changed to L t The renewable energy ratio is calculated by dividing the total amount of electricity used by the total amount of electricity used for one week by the total amount of electricity used for one week. Below, the renewable energy ratio is shown as a percentage.

[0108] Next, the plan creation unit 13 calculates the annual renewable energy ratio X (%) (step S33). Specifically, the plan creation unit 13 calculates the annual renewable energy ratio X (%) by dividing the total renewable energy ratio for each week for one year by the number of weeks in one year.

[0109] Next, the plan creation unit 13 calculates P, which is a value obtained by subtracting the calculated renewable energy ratio X (%) from the original target value R (%) of the renewable energy ratio and adding the resultant value Y (%) to the renewable energy ratio for each week. i In detail, the plan creation unit 13 calculates Y (%) by subtracting X (%) calculated in step S33 from R (%), which is the target value of the renewable energy ratio for the year, and adds the calculated Y (%) to the renewable energy ratio for each week calculated in step S32 to calculate P corresponding to the i-th week. i Calculate (%).

[0110] Next, the plan creation unit 13 i It is determined whether there is a week in which the percentage exceeds 100% (step S35). i If there is no week in which the renewable energy ratio target value for each week exceeds 100 (%) (No in step S35), the plan creation unit 13 sets the renewable energy ratio target value for each week to P i (%) (step S38), and the process ends.

[0111] P i If there is a week in which P (%) exceeds 100 (%) (Yes in step S35), the plan creation unit 13 i (%)>100(%) Week P i Next, the plan creation unit 13 changes the P of the other week to 100 (%) (step S36). i (%), P i (%)+Z(%) (step S37), and the process from step S35 is repeated. i (%)≦100(%) Week P i Add Z (%), which is the distribution ratio of the excess amount over P (%). i (%)>100(%) in the week iZ(%) is the sum of the values ​​obtained by multiplying the corresponding demand by P(%)-100(%). i The ratio is expressed as a percentage, divided by the total weekly demand for weeks with (%)≦100(%).

[0112] Through the above process, the target value of the renewable energy ratio for each week can be determined to be a value of 100(%) or less. In the above example, the ratio was allocated to each week so that the ratio was equal, but the target amount of electricity to be supplied by renewable energy for one year may be determined by multiplying the total demand for one year by the renewable energy ratio, and the target amount may be divided equally among each week. Similarly, in the allocation in step S37, the amount of electricity may be divided equally rather than allocated by ratio.

[0113] Returning to the explanation of Figure 7, after step S21, step S1 is executed in the same manner as in the example shown in Figure 3, and if the answer to step S1 is Yes, the plan creation unit 13 of the central device 1 determines whether it is the 53rd week (step S22). A year is divided into periods for which supply and demand plans are created, and although the final week is less than one week, the final week is the 53rd week because the periods are divided so that they start on the same day of the week. For this reason, step S22 determines whether it is the final week of the target setting period.

[0114] If it is 53 weeks (step S22 Yes), the central device 1 proceeds to step S5. If it is not 53 weeks (step S22 No), steps S2 to S4 are carried out as in the example shown in FIG. 3. After step S4, the central device 1 calculates the target value for the next week (step S23) and carries out the processing from step S5 onwards. Steps S5 to S7 are the same as in the example shown in FIG. 3.

[0115] FIG. 9 is a flowchart showing an example of the process of setting target values ​​for the next week, which is the process of step S23 in this embodiment. As shown in FIG. 9, the plan creation unit 13 calculates the difference between the renewable energy actual value and the planned value up to the (W-1)th week (step S41). The (W-1)th week is the latest week for which the central device 1 has been able to acquire actual values. That is, it is assumed that the central device 1 has been able to acquire actual values ​​up to the (W-1)th week of the target setting period. The renewable energy actual value is, for example, the ratio of the actual value of the amount of renewable energy power generation (including the renewable energy portion of the amount of power purchased and discharged) to the amount of demand up to the (W-1)th week of the target setting period. The planned value is, for example, the ratio of the planned value of the amount of renewable energy power generation (including the renewable energy portion of the amount of power purchased and discharged) to the planned value of the amount of demand up to the (W-1)th week.

[0116] The plan creation unit 13 determines whether the difference between the renewable energy actual value and the planned value up to the (W-1)th week is equal to or greater than a threshold value (step S42). Here, if the renewable energy actual value exceeds the planned value, the determination is No in step S42. However, even if the renewable energy actual value exceeds the planned value, if the difference between the renewable energy actual value and the planned value is equal to or greater than a threshold value, the determination may be Yes in step S42. If the renewable energy actual value exceeds the planned value, the ratio at which the difference is distributed in step S44, which will be described later, will be a negative value.

[0117] If the difference between the renewable energy actual value and the planned value up to the (W-1)th week is not equal to or greater than the threshold value (No in step S42), the plan creation unit 13 determines whether or not there has been a change in the predicted value of the power generation amount (step S43). For example, if there has been new installation, removal, or modification of power generation facilities at the bases 3-1 to 3-M, or if the prediction device 31 also predicts the amount of power generation from renewable energy, if there has been a change in the predicted value from the next week onwards that is equal to or greater than the threshold value, it is determined that there has been a change in the predicted value of the power generation amount.

[0118] If there is a change in the predicted value of the power generation amount (Yes in step S43), the plan creation unit 13 calculates Q i(%) (step S44). In detail, the plan creation unit 13 calculates the amount of power equivalent to the difference between the actual renewable energy value and the planned value up to the (W-1)th week, and divides the calculated amount of power by the total amount of demand from week W onwards to calculate the ratio of distribution of the difference. Then, the plan creation unit 13 calculates Q by adding the ratio of distribution of the difference to the renewable energy ratio target value for each week. i Calculate (%).

[0119] Steps S45 to S48 are the same as steps S35 to S38 shown in FIG. 8, and are the process of correcting the target value for the week in which the target value exceeds 100(%). i (%) to Q i (%) and Z(%) is replaced with V(%).

[0120] If the result of step S42 is Yes, the plan creation unit 13 proceeds to step S44. If the result of step S43 is No, the plan creation unit 13 ends the process. In this case, the target value of the renewable energy ratio for the next week is not changed.

[0121] As described above, the plan creation unit 13 creates a supply and demand plan for each creation target period, which is a period into which the target setting period is divided, and sets a period target value, which is a target value for the renewable energy ratio for each creation target period, based on the target value.The plan creation unit 13 then uses the actual value of the renewable energy ratio for the target setting period to reset the period target value for the period after the period for which the actual value has been obtained, and creates a supply and demand plan using the reset period target value.In this way, by sequentially changing the target value for the renewable energy ratio for each week to reflect the actual value, the target value for the renewable energy ratio for the target setting period can be achieved even if a difference occurs between the planned value and the actual value.

[0122] Next, the hardware configuration of the central device 1 of this embodiment will be described. In the central device 1 of this embodiment, a computer program that describes the processing to be performed by the central device 1 is executed on the computer system, causing the computer system to function as the central device 1. FIG. 10 is a diagram showing an example of the configuration of a computer system that realizes the central device 1 of this embodiment. As shown in FIG. 10, this computer system includes a control unit 101, an input unit 102, a storage unit 103, a display unit 104, a communication unit 105, and an output unit 106, which are connected via a system bus 107.

[0123] In FIG. 10 , the control unit 101 is a processor such as a CPU (Central Processing Unit) that executes a program describing the processing in the central device 1 of this embodiment. The input unit 102 is composed of, for example, a keyboard, a mouse, etc., and is used by a user of the computer system to input various information. The memory unit 103 includes various memories such as RAM (Random Access Memory) and ROM (Read Only Memory) and a storage device such as a hard disk, and stores programs to be executed by the control unit 101, necessary data obtained during processing, etc. The memory unit 103 is also used as a temporary storage area for programs. The display unit 104 is composed of a display, an LCD (Liquid Crystal Display Panel), etc., and displays various screens to the user of the computer system. The communication unit 105 is a receiver and transmitter that performs communication processing. The output unit 106 is, for example, a printer. Note that FIG. 10 is merely an example, and the configuration of the computer system is not limited to the example of FIG. 10 .

[0124] Here, an example of the operation of the computer system until the program of this embodiment is ready to be executed will be described. In the computer system having the above-described configuration, for example, a computer program is installed in storage unit 103 from a CD-ROM or DVD-ROM inserted in a CD (Compact Disc)-ROM drive or DVD (Digital Versatile Disc)-ROM drive (not shown). Then, when the program is executed, the program read from storage unit 103 is stored in the main storage area of ​​storage unit 103. In this state, control unit 101 executes processing as central device 1 of this embodiment in accordance with the program stored in storage unit 103.

[0125] In the above description, a program describing the processing in the central device 1 is provided on a CD-ROM or DVD-ROM as a recording medium, but this is not limited to this. Depending on the configuration of the computer system, the capacity of the program to be provided, etc., it is also possible to use a program provided via a transmission medium such as the Internet via the communication unit 105.

[0126] The program of this embodiment causes a computer system to execute, for example, the steps of acquiring a predicted value of a consumer's electricity demand, and creating an electricity supply and demand plan by dividing the supplied electricity and the consumed electricity into renewable energy and non-renewable energy as variables using a target value for the ratio of renewable energy to the electricity consumed by the consumer, the predicted value, and the ratio of renewable energy for each source of electricity supplied, so as to meet the target value.

[0127] The plan creation unit 13, the command generation unit 15, and the sorting unit 16 shown in FIG. 2 are realized by the control unit 101 shown in FIG. 10 executing a computer program stored in the storage unit 103 shown in FIG. 10. The storage unit 103 shown in FIG. 10 is also used to realize the plan creation unit 13, the command generation unit 15, and the sorting unit 16 shown in FIG. 2. The information storage unit 12 and the plan storage unit 14 shown in FIG. 2 are part of the storage unit 103 shown in FIG. 10. The transmission / reception unit 11 shown in FIG. 2 is realized by the communication unit 105 shown in FIG. 10. Furthermore, the central device 1 may be realized by multiple computer systems. For example, the central device 1 may be realized by a cloud computer system.

[0128] Similarly, the base device 2 is also realized by a computer system having the configuration illustrated in FIG. 10, for example. The device control unit 24 illustrated in FIG. 2 is realized by the control unit 101 illustrated in FIG. 10 executing a computer program stored in the storage unit 103 illustrated in FIG. 10. The storage unit 103 illustrated in FIG. 10 is also used to realize the device control unit 24 illustrated in FIG. 2. The facility information storage unit 22 illustrated in FIG. 2 is part of the storage unit 103 illustrated in FIG. 10. The transmission / reception unit 21 and the performance value acquisition unit 23 illustrated in FIG. 2 are realized by the communication unit 105 illustrated in FIG. 10. The prediction device 31, the transaction support device 32, and the plan submission support device 33 are also each realized by a computer system having the configuration illustrated in FIG. 10, for example.

[0129] As described above, in this embodiment, a supply and demand plan is created in which both power generation and demand are divided into renewable energy and non-renewable energy so that the objective function, which is the cost of consumers, is equal to or less than a threshold value under constraints including the achievement of the target value of the renewable energy ratio. Therefore, a supply and demand plan that can achieve the target renewable energy ratio can be created.

[0130] Embodiment 2 Next, a power management system according to a second embodiment will be described. FIG. 11 is a diagram schematically illustrating the relationship between bases 3 and an operator according to the second embodiment. In this embodiment, an example will be described in which each base 3 is, for example, a base for a different consumer, and a system operator (SO) that manages power interchange between the bases 3 exists separately from the consumers. As shown in FIG. 11, in this embodiment, plans such as a supply and demand plan are created at each base 3, and the amount and unit price of power interchange between the bases 3 are determined by bidding via the system operator. In this embodiment, a target value for the renewable energy ratio is set for each base 3.

[0131] FIG. 12 is a diagram illustrating an example of the configuration of a central device and a base device according to this embodiment. As shown in FIG. 12, the energy management system according to this embodiment includes a central device 1a, a base device 2a-1, a prediction device 31, a transaction support device 32, and a plan submission support device 33. The central device 1a is operated and managed by a system operator. Note that while the base devices 2a-2 to 2a-M are not illustrated in FIG. 12, base devices 2a-1 to 2a-M are provided at bases 3-1 to 3-M, respectively, as in the first embodiment. The equipment provided at bases 3-1 to 3-M is the same as the example shown in FIG. 1 of the first embodiment, except that base devices 2a-1 to 2a-M are provided instead of base devices 2-1 to 2-M. When referring to the base devices 2a-1 to 2a-M without distinguishing them individually, they are referred to as base device 2a. In this embodiment, the base device 2a is a power management device that creates a supply and demand plan. Components having the same functions as those in the first embodiment are given the same reference numerals as those in the first embodiment, and redundant explanations will be omitted. Below, differences from the first embodiment will be mainly explained.

[0132] As shown in Figure 12, the base device 2a-1 has an information storage unit 41, a plan creation unit 42, a plan storage unit 43, a sorting unit 44, a power exchange bidding unit 45, and a command generation unit 46 added to the base device 2 of embodiment 1.

[0133] In this embodiment, the transmitter / receiver 21 communicates with the central device 1a and also communicates with the prediction device 31. The transmitter / receiver 21 receives prediction results of demand and renewable energy power generation amount within the base 3 from the prediction device 31, and stores the received prediction results of demand and renewable energy power generation amount in the information storage unit 41. Note that FIG. 12 shows an example in which the supply and demand plans created by the base devices 2a-1 to 2a-M are transmitted to the central device 1a, and the central device 1a submits the integrated plan to the cross-regional organization via the plan submission support device 33, but each base 3 may submit a supply and demand plan to the cross-regional organization via the plan submission support device 33.

[0134] The information storage unit 41 stores facility information of the base 3, as well as various unit prices and the like that serve as input information for calculating the objective function and setting constraint conditions, as described in the first embodiment. The information storage unit 41 also stores the performance values ​​acquired by the performance value acquisition unit 23.

[0135] The plan creation unit 42 determines each variable to minimize the objective function or to make the objective function equal to or less than a threshold value by solving an optimization problem in the same manner as in the first embodiment, using equation (1) described in the first embodiment as an objective function and equations (3) to (12) described in the first embodiment as constraints. The power interchange unit price is set based on, for example, the power generation unit price, and the determined value is used as an input to determine the supply and demand plan. The power interchange unit price can be, for example, a value obtained by adding a margin to the power generation unit price, but is not limited to this. The difference between the power generation in the supply and demand plan, the upper limit of the power generation power of the power generation facility, and the power generation in the supply and demand plan is the surplus, and the surplus can be used as the power interchange amount. If a shortage occurs in the supply and demand plan, the shortage can be used as the power interchange amount. The power interchange unit price and the power interchange amount for bidding may be determined after the supply and demand plan is calculated. The power interchange bidding unit 45 generates bidding data for bidding based on the amount of interchange and the unit price (power interchange unit price) received from the plan creation unit 42, outputs the bidding data to the transmitter / receiver 21, and the transmitter / receiver 21 transmits the bidding data to the central device 1a. When the transmitter / receiver 21 receives the agreement results based on the bidding, it stores the agreement results in the information storage unit 41, and the plan creation unit 42 recreates the supply and demand plan using the agreement results stored in the information storage unit 41. The plan creation unit 42 stores the created supply and demand plan in the plan storage unit 43. The bidding data and the agreement results also include the ratio between renewable energy and non-renewable energy.

[0136] The sorting unit 44 sorts based on the actual results stored in the information storage unit 41, similar to the sorting unit 16 of the first embodiment, and stores the sorting results in the information storage unit 41. The command generation unit 46 generates control command values ​​for controlling the devices (facility) within the base 3 based on the supply and demand plan stored in the plan storage unit 43, and outputs the generated control command values ​​to the equipment control unit 24.

[0137] As shown in FIG. 12 , the central device 1a includes a transceiver 11 and an agreement processor 17. The transceiver 11 receives bid data from the base device 2a and outputs the received bid data to the agreement processor 17. The agreement processor 17 performs agreement processing based on the bid data and outputs the agreement result to the transceiver 11. The transceiver 11 transmits the agreement result to the corresponding base device 2a. There are no particular restrictions on the method of agreement processing, and a general method can be used. The agreement processor 17 creates a trading plan for the energy trading market based on the agreement result, outputs the trading plan to the transceiver 11, and the transceiver 11 transmits the trading plan to the trading support device 32.

[0138] 13 is a flowchart showing an example of a supply and demand plan creation processing procedure in the base device 2a of this embodiment. The plan creation unit 42 of the base device 2a executes steps S1 to S2 described in embodiment 1, similar to the plan creation unit 13 of the central device 1 of embodiment 1. Note that the input information acquired in step S2 is input information used in step S3a, which will be described later.

[0139] Next, the base device 2a creates a supply and demand plan (step S3a). In detail, the plan creation unit 42 uses the unit price of power interchange as a variable, equation (1) described in the first embodiment as an objective function, and equations (3) to (12) described in the first embodiment as constraints to solve an optimization problem in the same way as in the first embodiment, thereby determining each variable so as to minimize the objective function or make the objective function equal to or less than a threshold value.

[0140] Next, the base device 2a makes a bid for the interchanged power (step S51). In detail, the plan creation unit 42 determines the interchange amount and unit price based on the supply and demand plan created in step S3a, and outputs the determined interchanged amount and unit price to the interchanged power bidding unit 45. Then, the interchanged power bidding unit 45 generates bidding data for making a bid based on the interchanged amount and unit price received from the plan creation unit 42, outputs the bidding data to the transmission / reception unit 21, and the transmission / reception unit 21 transmits the bidding data to the central device 1a.

[0141] Next, the base device 2a receives the contract result (step S52). In detail, the transmitter / receiver 21 receives the contract result from the central device 1a and stores the contract result in the information storage unit 41.

[0142] Next, the base device 2a creates a supply and demand plan that reflects the agreement result (step S53). In detail, the plan creation unit 42 reads the agreement result from the information storage unit 41, and creates a supply and demand plan by solving an optimization problem in the same manner as in the first embodiment, reflecting the unit price and the interchange amount indicated in the agreement result, using equation (1) described in the first embodiment as an objective function and equations (3) to (12) described in the first embodiment as constraints, and stores the created supply and demand plan in the plan storage unit 43.

[0143] Next, the base device 2a determines whether it is time to generate a control command (step S54). For example, the base device 2a generates a control command value for controlling equipment (facility) within the base 3 at a predetermined command generation cycle, and the base device 2a determines that it is time to generate a control command every time a time corresponding to the predetermined command generation cycle has elapsed. If it is not time to generate a control command (step S54 No), the base device 2a repeats the process from step S1.

[0144] If it is time to generate a control command (Yes in step S54), the base device 2a performs step S6, as in embodiment 1. Next, the base device 2a controls the device based on the control command value (step S55), and repeats the process from step S1.

[0145] In this embodiment, the target value of the renewable energy ratio may also be reset to reflect the actual value, as in the example shown in Fig. 7 of embodiment 1. Furthermore, the base device 2a may transmit the environmental value procurement plan included in the supply and demand plan to a device (not shown) that supports trading of environmental values.

[0146] As described above, in this embodiment, the supply and demand plan created by base device 2a is a supply and demand plan for one of multiple bases 3 that can interchange power. The interchange power bidding unit 45 generates bidding data including the amount and unit price for the power interchange, and the transmitter / receiver 21 transmits the bidding data to central device 1a and receives the agreement result from central device 1a. Then, the plan creation unit 42 creates a supply and demand plan based on the agreement result.

[0147] The central device 1a and the base device 2a of this embodiment are also realized by a computer system having the configuration shown in FIG. 10, similarly to the central device 1 and the base device 2 of the first embodiment.

[0148] The contract processing unit 17 shown in Fig. 12 is realized by the control unit 101 shown in Fig. 10 executing a computer program stored in the storage unit 103 shown in Fig. 10. The storage unit 103 shown in Fig. 10 is also used to realize the contract processing unit 17 shown in Fig. 12.

[0149] The plan creation unit 42, the sorting unit 44, the interchange power bidding unit 45, and the command generation unit 46 shown in Fig. 12 are realized by the control unit 101 shown in Fig. 10 executing a computer program stored in the storage unit 103 shown in Fig. 10. The storage unit 103 shown in Fig. 10 is also used to realize the plan creation unit 42, the sorting unit 44, the interchange power bidding unit 45, and the command generation unit 46 shown in Fig. 12. The information storage unit 41 and the plan storage unit 43 shown in Fig. 12 are part of the storage unit 103 shown in Fig. 10.

[0150] As described above, in this embodiment, even when a supply and demand plan is created for each base 3, similar to the first embodiment, a supply and demand plan is created in which both power generation and demand are separated into renewable energy and non-renewable energy so that the objective function representing the cost of consumers is equal to or less than a threshold value under constraints including the achievement of the target value of the renewable energy ratio. Therefore, a supply and demand plan that can achieve the target renewable energy ratio can be created.

[0151] Embodiment 3 Next, a power management system according to a third embodiment will be described. FIG. 14 is a diagram schematically illustrating the relationship between the bases 3 and an operator according to the third embodiment. In this embodiment, as in the second embodiment, each base 3 is, for example, a base for a different consumer, and a system operator who manages power interchange between the bases 3 exists separately from the consumers. As shown in FIG. 14, in this embodiment, as in the second embodiment, plans such as a supply and demand plan are created at each base 3, but the amount of power interchange between the bases 3 is determined by a price signal being presented by the system operator, and the amount of interchange (possible amount) of each base 3 being presented to the system operator based on the price signal (signal). In this embodiment, as in the second embodiment, a target value for the renewable energy ratio is set for each base 3.

[0152] FIG. 15 is a diagram illustrating an example of the configuration of a central device and a base device according to this embodiment. As shown in FIG. 15, the power management system according to this embodiment includes a central device 1b, a base device 2b-1, a prediction device 31, a transaction support device 32, and a plan submission support device 33. The central device 1b is operated and managed by a system operator. Although the base devices 2b-2 to 2b-M are not illustrated in FIG. 15, base devices 2b-1 to 2b-M are provided at bases 3-1 to 3-M, respectively, as in the first embodiment. The equipment provided at bases 3-1 to 3-M is the same as the example shown in FIG. 1 of the first embodiment, except that base devices 2b-1 to 2b-M are provided instead of the base devices 2-1 to 2-M. When referring to the base devices 2b-1 to 2b-M without distinguishing them individually, they are referred to as the base device 2b. In this embodiment, the base device 2b is a power management device that creates a supply and demand plan. Components having the same functions as those in the second embodiment are given the same reference numerals as those in the second embodiment, and redundant explanations will be omitted. Below, differences from the second embodiment will be mainly explained.

[0153] As shown in FIG. 15, the base device 2b-1 is the same as the base device 2a of the second embodiment except that it includes an interchangeable amount determination unit 47 instead of the interchangeable power bidding unit 45 of the base device 2a of the second embodiment.

[0154] In this embodiment, the central device 1b determines a price signal indicating the unit price for power interchange between the bases 3 and transmits the determined price signal to the base device 2b. The price signal may be determined as a single unit price, or, for example, as X yen / kWh for power less than x [kWh] and Y yen / kWh for power greater than x [kWh] and power less than x + y [kWh]. Furthermore, the central device 1b may predict the price of non-fossil fuel energy certificates and then determine the price signal to be lower than the predicted price of non-fossil fuel energy certificates. The transceiver unit 21 of the base device 2b stores the received price signal in the information storage unit 41. The plan creation unit 42 uses the price signal to create a supply and demand plan, as in the second embodiment, and outputs the created supply and demand plan to the available interchange amount determination unit 47. The available interchange amount determination unit 47 determines the available interchange amount based on the supply and demand plan and outputs the determined available interchange amount to the transceiver unit 21. The transmitter / receiver 21 transmits the available amount to the central device 1b. When the transmitter / receiver 21 receives a contract result (described later) from the central device 1b, the transmitter / receiver 21 stores the contract result in the information storage unit 41, and the plan creation unit 42 recreates a supply and demand plan using the contract result stored in the information storage unit 41. The plan creation unit 42 stores the created supply and demand plan in the plan storage unit 43.

[0155] The central device 1b includes a transceiver unit 11, an agreement processing unit 17, and a price signal determination unit 18. The price signal determination unit 18 determines a price signal and outputs it to the transceiver unit 11. The transceiver unit 11 transmits the price signal to the base device 2b. The agreement processing unit 17 performs agreement processing based on the available interchange amount received from the base device 2b and outputs the agreement result to the transceiver unit 11. The agreement result includes the determined unit price and interchange amount. The transceiver unit 11 transmits the agreement result to the corresponding base device 2b. There are no particular restrictions on the method of agreement processing, and a general method can be used. Furthermore, the agreement processing unit 17 creates a trading plan for the energy trading market based on the agreement result, outputs the trading plan to the transceiver unit 11, and the transceiver unit 11 transmits the trading plan to the trading support device 32.

[0156] FIG. 16 is a flowchart showing an example of a supply and demand plan creation processing procedure in the base device 2b of this embodiment. The plan creation unit 42 of the base device 2b executes step S1 described in the first embodiment, similar to the plan creation unit 13 of the central device 1 of the first embodiment. The base device 2b receives a price signal (step S61). Specifically, the transmitter / receiver 21 receives the price signal from the central device 1b and stores it in the information storage unit 41. Note that the timing for performing step S61 is not limited to the example shown in FIG. 16; the price signal may be transmitted from the central device 1b periodically, or may be transmitted from the central device 1b when the value of the price signal is changed.

[0157] The plan creation unit 42 of the base device 2b executes step S2 described in embodiment 1, similarly to the plan creation unit 13 of the central device 1 in embodiment 1. Note that the input information acquired in step S2 is input information used in step S3b, which will be described later.

[0158] Next, the base device 2b creates a supply and demand plan (step S3b). In detail, the plan creation unit 42 sets a unit price for power interchange using the price signal, and solves an optimization problem in the same manner as in the first embodiment, using equation (1) described in the first embodiment as an objective function and equations (3) to (12) described in the first embodiment as constraints, thereby determining each variable so as to minimize the objective function or make the objective function equal to or less than a threshold value.

[0159] Next, base device 2b transmits the available interchangeable amount (step S62). In detail, plan creation unit 42 outputs the supply and demand plan created in step S3b to available interchangeable amount determination unit 47. Then, available interchangeable amount determination unit 47 determines the available interchangeable amount based on the supply and demand plan received from plan creation unit 42, outputs the determined available interchangeable amount to transmission / reception unit 21, and transmission / reception unit 21 transmits the available interchangeable amount to central device 1b. Step S52 and subsequent steps are the same as those in the second embodiment.

[0160] FIG. 17 is a diagram illustrating another example of a method for determining a price signal according to this embodiment. In the example illustrated in FIG. 14, the system operator determines the price signal. However, in the example illustrated in FIG. 17, the buyer's site presents the price signal and the requested amount of power interchange to the system operator. At the buyer's site, the base device 2b may, for example, create a supply-demand plan using the unit price of power interchange as a variable, as in step S3a of the second embodiment, thereby determining the price signal and the requested amount. Alternatively, the price signal and the requested amount may be determined by other methods. The system operator presents the price signal and the requested amount received from the buyer's site to the seller's site. At the seller's site, the base device 2b creates a supply-demand plan using the price signal, as described in this embodiment, and transmits the available amount to the central device 1b. The central device 1b performs a contract process using the received available amount as described in this embodiment, and transmits the contract results to the seller's site and the base device 2b at the buyer's site. As a result, the base devices 2b at the seller's base and the buyer's base create supply and demand plans that reflect the results of the agreement.

[0161] As described above, in this embodiment, the supply and demand plan created by base device 2b is a supply and demand plan for one of multiple bases 3 at which power interchange is possible. A price signal indicating the unit price for power interchange is received from central device 1b, and available-for-interchange amount determination unit 47 determines the available-for-interchange amount using a provisionally determined supply and demand plan determined using the price signal. Transmitter / receiver 21 transmits the available-for-interchange amount to central device 1b and receives the agreement result from central device 1b. Plan creation unit 42 then creates a supply and demand plan based on the agreement result.

[0162] The central device 1b and the base device 2b of this embodiment are also realized by a computer system having the configuration illustrated in FIG. 10, similar to the central device 1 and the base device 2 of the first embodiment.

[0163] The price signal determination unit 18 shown in Fig. 15 is realized by the control unit 101 shown in Fig. 10 executing a computer program stored in the storage unit 103 shown in Fig. 10. The storage unit 103 shown in Fig. 10 is also used to realize the price signal determination unit 18 shown in Fig. 15.

[0164] The available exchange amount determination unit 47 shown in Fig. 15 is realized by executing a computer program stored in the storage unit 103 shown in Fig. 10 by the control unit 101 shown in Fig. 10. The available exchange amount determination unit 47 shown in Fig. 15 is also realized by using the storage unit 103 shown in Fig. 10.

[0165] As described above, in this embodiment, the base device 2b calculates the available interchange amount using a price signal, and the central device 1b determines the interchange amount. Also in this embodiment, a supply and demand plan is created that separates power generation and demand into renewable energy and non-renewable energy so that the objective function, which is the cost of consumers, is below a threshold value under constraints including achieving the target value of the renewable energy ratio. Therefore, a supply and demand plan that can achieve the target renewable energy ratio can be created.

[0166] Embodiment 4 FIG. 18 is a diagram showing an example of the configuration of a power resource management device according to a fourth embodiment. The configuration and operation of the power management system according to this embodiment are the same as those of the first embodiment, except that a power resource management device 8 shown in FIG. 18 is added. The power resource management device 8 manages the power resource of the power storage facility 7 at the base 3. Components having the same functions as those in the first embodiment are given the same reference numerals as those in the first embodiment, and redundant explanations will be omitted. Below, differences from the first embodiment will be mainly explained.

[0167] In this embodiment, when transmitting a control command value, the central device 1 also transmits the ratio of the renewable energy portion to the non-renewable energy portion in the control command value together with the control command value to the base device 2. The transmitter / receiver 21 of the base device 2 outputs the control command value together with the ratio of the renewable energy portion to the non-renewable energy portion to the equipment control unit 24, and the equipment control unit 24 outputs a charge / discharge command to the power storage equipment 7 based on the control command value, and transmits the control command value together with the ratio of the renewable energy portion to the non-renewable energy portion to the power resource management device 8.

[0168] The power resource management device 8 includes a charge / discharge command acquisition unit 81, a resource-specific SOC calculation unit 82, an SOC acquisition unit 83, an SOC storage unit 84, and an SOC output unit 85. The charge / discharge command acquisition unit 81 receives a control command value and a ratio between a renewable energy portion and a non-renewable energy portion from the device control unit 24, and outputs the received control command value and ratio to the resource-specific SOC calculation unit 82. The SOC storage unit 84 stores, as SOCs by resource, SOC1, which is the SOC of the renewable energy portion, and SOC2, which is the SOC of the non-renewable energy portion. The resource-specific SOC calculation unit 82 calculates the charge / discharge amount of the renewable energy portion and the charge / discharge amount of the non-renewable energy portion using the control command value and the ratio. In the case of charging, the resource-specific SOC calculation unit 82 updates SOC1 stored in the SOC storage unit 84 with a value obtained by multiplying the calculated charge / discharge amount (charge amount) of the renewable energy portion by the charging efficiency and adding the result to SOC1. In the case of discharging, the resource-specific SOC calculation unit 82 updates SOC1 stored in the SOC storage unit 84 with a value obtained by multiplying the calculated charge / discharge amount (discharge amount) of the renewable energy portion by 1 / discharge efficiency and adding the result to SOC1. Note that the charge / discharge amount is assumed to be a positive value in the case of charging and a negative value in the case of discharging. In the case of charging, the resource-specific SOC calculation unit 82 updates SOC2 stored in the SOC storage unit 84 with a value obtained by multiplying the calculated charge / discharge amount (charge amount) of the non-renewable energy portion by the charging efficiency and adding the result to SOC2. In the case of discharging, the resource-specific SOC calculation unit 82 updates SOC2 stored in the SOC storage unit 84 with a value obtained by multiplying the calculated charge / discharge amount (discharge amount) of the non-renewable energy portion by 1 / discharge efficiency and adding the result to SOC2.

[0169] The SOC output unit 85 transmits SOC1 and SOC2 stored in the SOC storage unit 84 to the base device 2. The SOC acquisition unit 83 acquires SOC information indicating the SOC of the power storage facility 7 from the power storage facility 7 and outputs the acquired SOC information to the resource-based SOC calculation unit 82. The resource-based SOC calculation unit 82 reads out SOC1 and SOC2 stored in the SOC storage unit 84, and if there is a difference between SOC1+SOC2 and the SOC indicated by the SOC information that is equal to or greater than a threshold, updates SOC1 and SOC2 stored in the SOC storage unit 84 based on the ratio of SOC1+SOC2 to the SOC indicated by the SOC information, thereby making SOC1+SOC2 stored in the SOC storage unit 84 match the SOC indicated by the SOC information.

[0170] The base device 2 may transmit the SOC1 and SOC2 received from the power resource management device 8 as actual values ​​to the central device 1. Furthermore, a display unit (not shown) in the base device 2 or the power resource management device 8 may display the SOC1 and SOC2. In this embodiment, the power resource management device 8 manages the SOC for each resource, so that the amount of power stored in the power storage facility 7 can be grasped by dividing it into renewable energy and non-renewable energy portions.

[0171] Although an example in which the power resource management device 8 is added to the power system of the first embodiment has been described here, the power resource management device 8 may be added to the power systems of the second and third embodiments in the same way.

[0172] The power resource management device 8 of this embodiment is also realized by a computer system having the configuration exemplified in FIG. 10, similar to the central device 1 of the first embodiment.

[0173] The resource-specific SOC calculation unit 82 shown in Fig. 18 is realized by the control unit 101 shown in Fig. 10 executing a computer program stored in the storage unit 103 shown in Fig. 10. The storage unit 103 shown in Fig. 10 is also used to realize the resource-specific SOC calculation unit 82 shown in Fig. 18. The SOC storage unit 84 shown in Fig. 18 is a part of the storage unit 103 shown in Fig. 10. The charge / discharge command acquisition unit 81, the SOC acquisition unit 83, and the SOC output unit 85 shown in Fig. 18 are realized by the communication unit 105 shown in Fig. 10.

[0174] <Example of supply and demand plan display> Fig. 19 is a diagram showing an example of a display screen of a supply and demand plan created in the first to fourth embodiments. The supply and demand plan is displayed, for example, by a display unit (not shown in Figs. 2 and 18) in the central device 1 and the base device 2 in the first and fourth embodiments, or a display unit (not shown in Figs. 12 and 15) in the base devices 2a and 2b in the second and third embodiments. In this embodiment, a supply and demand plan is created separately for renewable energy and non-renewable energy, so that renewable energy and non-renewable energy can be displayed separately, as shown in Fig. 19.

[0175] In the example shown in FIG. 19, for one base 3, the upper row displays the supply and demand of electricity related to renewable energy, the middle row displays the supply and demand of electricity related to non-renewable energy, and the lower row displays the combined supply and demand of electricity from renewable energy and non-renewable energy. In FIG. 19, the horizontal axis represents time, and the vertical axis represents the amount of electricity or SOC. The amount of electricity supplied is represented by bars, and the demand is represented by a solid broken line. The dashed line represents the SOC of the power storage facility 7. PV represents the amount of electricity generated by solar power generation, Interchange IN represents the amount supplied by power interchange, Retail represents the amount purchased from a retail electricity supplier, and Discharge represents the amount discharged from the power storage facility 7. Note that FIG. 19 is an example, and the specific items to be illustrated, the display format, etc. are not limited to the example shown in FIG. 19.

[0176] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or different embodiments may be combined with each other. It is also possible to omit or modify parts of the configurations as long as they do not deviate from the gist of the invention. [Explanation of symbols]

[0177] 1, 1a, 1b Central device, 2, 2-1 to 2-M, 2a-1, 2b-1 Base device, 3-1 to 3-M Base, 4-1 to 4-NR Renewable energy power generation facility, 5-1 to 5-NNR Non-renewable energy power generation facility, 6 Load, 7, 7-1, 7-2 Storage facility, 8 Power resource management device, 11, 21 Transmitting and receiving unit, 12, 41 Information storage unit, 13, 42 Plan creation unit, 14, 43 Plan storage unit, 15, 46 Command generation unit, 16, 44 Sorting unit, 17 Agreement processing unit, 18 Price signal determination unit, 22 Facility information storage unit, 23 Actual value acquisition unit, 24 Equipment control unit, 31 Forecasting unit, 32 Trading support unit, 33 Plan submission support unit, 34 Electricity market trading system, 35 Cross-regional operation system, 45 Power exchange bidding unit, 47 Interchangeable amount determination unit, 81 charge / discharge command acquisition unit, 82 resource-specific SOC calculation unit, 83 SOC acquisition unit, 84 SOC storage unit, 85 SOC output unit.

Claims

1. a plan creation unit that creates an electricity supply and demand plan by determining, as variables, the amount of electricity supplied from the business operator to the electricity distribution line of the consumer, the amount of electricity supplied from the electricity storage facility of the consumer to the electricity distribution line of the consumer, the amount of electricity consumed by the load of the consumer, and the amount of electricity used to charge the electricity storage facility with a mixture of renewable energy and non-renewable energy, respectively, by dividing the amount of electricity into renewable energy and non-renewable energy, so as to satisfy the target value, using a target value of the ratio of renewable energy to the electricity consumed by the consumer, a predicted value of the electricity demand of the consumer, a predicted value of the amount of electricity generated by renewable energy at the consumer's power generation facility, the ratio of renewable energy to the amount of electricity generated by the power generation facility of the consumer, and the ratio of renewable energy to the amount of electricity supplied from the business operator selling electricity to the electricity distribution line of the consumer; A power management device comprising:

2. Manage multiple bases of the customer; The supply and demand plan includes an amount of power to be exchanged between the bases, The power management device according to claim 1 , wherein the plan creation unit determines the amount of power interchange separately for renewable energy and non-renewable energy.

3. The power management device according to claim 2, wherein the plan creation unit creates the supply and demand plan so that the sum of the costs at the multiple bases and the costs required to operate the power interchange is below a threshold value.

4. The power management device described in Claim 2, characterized in that the amount of power transferred is transferred from one or more other bases to the base to which the power is transferred.

5. the supply and demand plan is a supply and demand plan at one of a plurality of bases at which power interchange is possible, The power management device an interchange power bidding unit that generates bidding data including an interchange amount and a unit price for the interchange of power; a transmitting / receiving unit that transmits the bidding data to a central device that performs contract processing for the power interchange and receives a contract result from the central device; Equipped with The power management device according to claim 1 , wherein the plan creation unit creates the supply and demand plan based on the agreement result.

6. the supply and demand plan is a supply and demand plan at one of a plurality of bases at which power interchange is possible, The power management device a transceiver that receives a price signal indicating a unit price for the power interchange from a central device that performs contract processing for the power interchange; an available amount determination unit that determines an available amount of power using the supply and demand plan that has been provisionally determined using the price signal; Equipped with the transmitting and receiving unit transmits the available amount to the central device and receives a contract result from the central device; The power management device according to claim 1 , wherein the plan creation unit creates the supply and demand plan based on the agreement result.

7. creating the supply and demand plan for each target creation period, which is a period into which a target setting period, which is a period for which the target value is set, is divided into a plurality of periods; and setting a period target value, which is a target value for the ratio of renewable energy for each target creation period, based on the target value; The power management device of any one of claims 1 to 6, characterized in that the plan creation unit uses actual values ​​of the renewable energy ratio during the target setting period to reset the period target value for the period after the period for which the actual values ​​have been acquired, and creates the supply and demand plan using the reset period target value.

8. a base device that is installed at each base and creates an electricity supply and demand plan by determining, as variables, the amount of electricity supplied from the business operator to the electricity distribution line of the consumer, the amount of electricity supplied from the electricity storage equipment of the consumer to the electricity distribution line of the consumer, the amount of electricity consumed by the load of the consumer, and the amount of electricity used to charge the electricity storage equipment with a mixture of renewable energy and non-renewable energy, each divided into renewable energy and non-renewable energy, so as to satisfy the target value, using a target value for the ratio of renewable energy to the electricity consumed by the consumer, a predicted value for the electricity demand of the consumer, a predicted value for the amount of electricity generated by renewable energy at the consumer's power generation facility, the renewable energy ratio of the amount of electricity generated by the power generation facility of the consumer, and the renewable energy ratio of the amount of electricity supplied from the business operator selling electricity to the electricity distribution line of the consumer; a central device that performs processing for agreeing on power interchange between the bases; Equipped with the base device transmits bidding data including an amount of power to be substituted and a unit price for the power interchange to a central device; the central device performs the contract processing based on the bid data received from the base device and transmits a contract result to the base device; The base device receives a contract result from the central device, and creates the supply and demand plan based on the contract result.

9. a base device that is installed at each base and creates an electricity supply and demand plan by determining, as variables, the amount of electricity supplied from the business operator to the electricity distribution line of the consumer, the amount of electricity supplied from the electricity storage equipment of the consumer to the electricity distribution line of the consumer, the amount of electricity consumed by the load of the consumer, and the amount of electricity used to charge the electricity storage equipment with a mixture of renewable energy and non-renewable energy, each divided into renewable energy and non-renewable energy, so as to satisfy the target value, using a target value for the ratio of renewable energy to the electricity consumed by the consumer, a predicted value for the electricity demand of the consumer, a predicted value for the amount of electricity generated by renewable energy at the consumer's power generation facility, the renewable energy ratio of the amount of electricity generated by the power generation facility of the consumer, and the renewable energy ratio of the amount of electricity supplied from the business operator selling electricity to the electricity distribution line of the consumer; a central device that determines a price signal indicating a unit price for power interchange between the bases and transmits the price signal to the base devices; Equipped with The base device receives the price signal from the central device, determines an available amount of power to be supplied using a supply and demand plan provisionally determined using the price signal, and calculates the available amount of power to be supplied by to the central device, the central device performs contract processing based on the available amount received from the base device and transmits a contract result to the base device; The base device receives a contract result from the central device, and creates the supply and demand plan based on the contract result.

10. a forecasting device that forecasts the power demand and the amount of power generated by renewable energy at a consumer; a power management device that creates a power supply and demand plan by determining, as variables, the amount of power supplied from the business operator to the power distribution line of the consumer, the amount of power supplied from the power storage facility of the consumer to the power distribution line, the amount of power consumed by the load of the consumer, and the amount of power used to charge the power storage facility with a mixture of renewable energy and non-renewable energy, respectively, by dividing them into renewable energy and non-renewable energy, so as to satisfy the target value, using the target value of the ratio of renewable energy to the power consumed by the consumer, the predicted value of the power demand predicted by the prediction device, the predicted value of the power generation amount predicted by the prediction device, the ratio of renewable energy to the amount of power generated by the power generation facility of the consumer, and the ratio of renewable energy to the amount of power supplied from the business operator selling electricity to the power distribution line of the consumer; A power management system comprising:

11. a trading support device that supports trading processing in the electricity trading market based on the supply and demand plan created by the electricity management device; The power management system according to claim 10, further comprising:

12. a plan submission support device that creates a supply and demand plan to be submitted to a cross-regional operation system that manages wide-area power supply and demand based on the supply and demand plan created by the power management device, and transmits the supply and demand plan to be submitted to the cross-regional operation system; 12. The power management system according to claim 10, further comprising:

13. A power management method in a power management device, comprising: Obtaining a predicted value of the consumer's power demand and a predicted value of the amount of power generated by renewable energy; A power management method characterized by creating a power supply and demand plan by using a target value for the ratio of renewable energy to the power consumed by the consumer, a forecast value for the power demand, the forecast value for the amount of power generated, the ratio of renewable energy to the amount of power generated by the consumer's power generation equipment, and the ratio of renewable energy to the amount of power supplied from a business selling electricity to the consumer's distribution line, to satisfy the target value by determining as variables the amount of power supplied from the business to the consumer's distribution line, the amount of power supplied from the consumer's power storage equipment to the distribution line, the amount of power consumed by the consumer's load, and the amount of power used when charging the power storage equipment with a mixture of renewable energy and non-renewable energy, each divided into renewable energy and non-renewable energy.

14. In the computer system, obtaining a predicted value of power demand of a consumer and a predicted value of power generation amount by renewable energy; a step of creating an electricity supply and demand plan by determining, as variables, the amount of electricity supplied from the utility to the electricity distribution line of the consumer, the amount of electricity supplied from the utility to the electricity distribution line of the consumer, the amount of electricity supplied from the utility to the electricity distribution line of the consumer, the amount of electricity consumed by the consumer's load, and the amount of electricity used to charge the electricity storage facility with a mixture of renewable energy and non-renewable energy, respectively, by dividing the amount of electricity into renewable energy and non-renewable energy, so as to satisfy the target value, using the target value of the ratio of renewable energy to the electricity consumed by the consumer, the predicted value of the electricity demand, the predicted value of the electricity power generation, the ratio of renewable energy to the amount of electricity generated by the consumer's power generation facility, and the ratio of renewable energy to the amount of electricity supplied from the utility to the electricity distribution line of the consumer, A power management program characterized by executing the above.

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