Power consignment planning device, power consignment planning method, and power consignment planning program

Abstract

To provide a power consignment planning device which minimizes entire cost while taking into consideration CO2 emissions, renewable energy derived power amounts and delivery cost of an environmental certificates.SOLUTION: A power consignment planning device 100 comprises: a power cost calculation section for calculating a consignment charge and an electricity rate of a first base including a demand facility generated in accordance with a power amount bought from a retailing electricity undertaker and power generation cost of a second base including a power generation facility; a decarbonization indicator calculation section for calculating CO2 emissions and renewable energy derived power amounts; a certificate cost calculation section for calculating certificate cost representing a delivery amount and delivery cost of environmental certificates required for achieving a preset goal value regarding any one of the CO2 emissions and the renewable energy derived power amounts; and a demand-supply planning section for formulating a planning value of a consignment power reception amount so as to minimize total cost including the consignment charge, the electricity rate and certificate cost of the first base and the power generation cost of the second base while the total of the consignment power reception amount and the bought power amount satisfies a prediction value of a demand amount of power of the first base.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a power transmission planning device.

Background Art

[0002] Self-delivery, in which power generated using on-site power generation facilities is transmitted to another site of the company via the power transmission and distribution network of a general power transmission and distribution company, is widespread. In self-delivery, by transmitting power generated from renewable energy such as solar power generation, it is possible to contribute not only to reducing power costs such as electricity bills but also to reducing carbon dioxide (hereinafter referred to as CO2) emissions.

[0003] For example, in the planning device of Patent Document 1, in the transmission from a site equipped with a storage battery to another site, a transmission plan is made to minimize the objective function representing the total metered charge among the electricity bill and the transmission charge, so as to reduce the power cost. Also, by optimizing the objective function related to the CO2 emission amount, the CO2 emission amount can be reduced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional planning device, the amount of power derived from renewable energy is not considered, and the concept of environmental certificates that can convert the amount of power derived from non-renewable energy into the amount of power derived from renewable energy cannot be applied. Furthermore, since environmental certificates cannot be handled, the procurement cost of environmental certificates cannot be considered either. For this reason, there has been a problem that it is impossible to create a transmission plan that minimizes costs while achieving target values regarding the CO2 emission amount, the amount of power derived from renewable energy, or both.

[0006] The present disclosure has been made to solve the above problems, and while achieving target values related to CO2 emissions, the amount of power derived from renewable energy, or both, considering the amount of power derived from renewable energy or environmental certificates, it enables the creation of a power transmission plan that minimizes the total cost considering the procurement cost of environmental certificates. The purpose is to provide a power transmission planning device, a power transmission planning method, and a power transmission planning program.

Means for Solving the Problems

[0007] The power transmission planning device according to the present disclosure includes: a power cost calculation unit that calculates a transmission fee generated according to the received transmission power amount when a first site having demand facilities receives transmission from a second site having power generation facilities, an electricity fee generated according to the power purchase amount from a retail electricity provider regarding the first site, and a power generation cost generated according to the power generation amount of the power generation facilities at the second site; a decarbonization index calculation unit that calculates the CO2 emissions amount and the amount of power derived from renewable energy for the received transmission power amount and the power purchase amount from the second site; a certificate cost calculation unit that calculates a certificate cost representing the procurement amount and procurement cost of environmental certificates required to achieve a preset target value regarding at least one of the CO2 emissions amount and the amount of power derived from renewable energy; and a supply-demand planning unit that determines whether to perform transmission so that the total of the received transmission power amount and the power purchase amount satisfies the predicted value of the power demand at the first site, and while the transmission fee, electricity fee, and certificate cost at the first site, and the total cost including the power generation cost at the second site are minimized, formulates a planned value of the received transmission power amount when performing transmission.

[0008] The power transmission planning method according to the present disclosure includes: a step of calculating a transmission fee generated according to the received transmission amount when a first site having demand facilities receives transmission from a second site having power generation facilities, an electricity fee generated according to the amount of electricity purchased from a retail electricity supplier with respect to the first site, and a power generation cost generated according to the power generation amount of the power generation facilities at the second site; a step of calculating the amount of CO2 emissions and the amount of electricity derived from renewable energy with respect to the received transmission amount and the purchased electricity amount from the second site; a step of calculating a certificate cost representing the procurement amount and procurement cost of environmental certificates required to achieve a preset target value with respect to at least either the amount of CO2 emissions or the amount of electricity derived from renewable energy; a step of determining whether to perform transmission so that the total of the received transmission amount and the purchased electricity amount satisfies the predicted value of the power demand at the first site, and the total cost including the transmission fee, electricity fee, and certificate cost at the first site and the power generation cost at the second site is minimized, and formulating a planned value of the received transmission amount when performing transmission. Further, the power transmission planning program according to the present disclosure causes each of the above steps to be executed.

Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a power transmission planning device, a power transmission planning method, and a power transmission planning program that can create a transmission plan that minimizes the overall cost considering the procurement cost of environmental certificates while achieving a target value related to the amount of CO2 emissions, the amount of electricity derived from renewable energy, or both.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

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Figure 10

Figure 11

Figure 12

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Figure 14

Figure 15

Modes for Carrying Out the Invention

[0011] Embodiment 1. Embodiment 1 will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing the configuration of the first base 311 and the second base 321 in Embodiment 1, and FIG. 2 is a block diagram showing the power transmission planning device 100 in Embodiment 1. In FIG. 1, the first base 311 having the demand facility 211 receives power transmission from the second base 321 having the power generation facility 212. The first base 311 can procure power from a retail electricity provider (not shown) separately from the transmission from the second base 321. Here, FIG. 1 shows an example in which each base has only one demand facility 211 and one power generation facility 212, but the example is not limited to this, and two or more demand facilities 211 or two or more power generation facilities 212 may be provided.

[0012] As shown in FIG. 2, the power transmission planning device 100 is connected to the terminals 111 installed at the first base 311 and the second base 321, respectively. This connection method is not limited at all. For example, it may be directly connected by a signal line such as a coaxial cable, or may be connected via the Internet or an intranet. In addition to the connection with the terminal 111, the power transmission planning device 100 is connected to a general power transmission and distribution company (not shown) and a retail electricity provider (not shown), and is further connected to at least one of an environmental certificate exchange (not shown) which is a place for trading environmental certificates for proving the environmental value of power and an environmental certificate issuing company (not shown). Here, the connection destination of the power transmission planning device 100 is not limited to these, and for example, it may be connected to a weather information server that provides weather forecasts and performance information.

[0013] The terminal 111 outputs at least one of the actual value of the demand amount of the demand facility 211 (hereinafter referred to as the facility demand actual value) and the actual value of the power generation amount of the power generation facility 212 (hereinafter referred to as the facility power generation actual value) of the installed base, for example, at 30-minute intervals. Corresponding to the example in FIG. 1, the terminal 111 installed at the first base 311 outputs the facility demand actual value of the demand facility 211, and the terminal 111 installed at the second base 321 outputs the facility power generation actual value of the power generation facility 212. Here, the values output by the terminal 111 are not limited to the facility demand achievement value or the facility power generation achievement value. For example, the achievement value of the fuel consumption of the power generation facility 212 may be output. Further, the various values output by the terminal 111 are output in association with the time when the terminal 111 acquires the value from the demand facility 211 or the power generation facility 212, and the terminal ID (Identifier), which is an identifier uniquely assigned to each terminal 111. The power transmission plan device 100 can identify which base the various values output from the plurality of terminals 111 belong to using the terminal ID.

[0014] In the present disclosure, the demand, power generation, achievement values, predicted values (details will be described later), and planned values (details will be described later) related to these are described separately for the values related to the entire base and the values related to each facility within the base. Specifically, when indicating the value related to the facility, the name of the value is expressed using "facility" as a prefix, such as the above-mentioned facility power generation achievement value or facility demand achievement value. When indicating the value without particular notice, it is the value for each base. However, when there is only one demand facility 211 or power generation facility 212 in each base, the value related to the facility and the value related to the entire base are the same. Also, not only the demand and power generation, but also the various values and amounts in the present disclosure are values for each time unit (hereinafter referred to as frames) for which a transmission plan is made in 30-minute increments, when not particularly indicated.

[0015] Furthermore, a display device (not shown) and an input device (not shown) are connected to the power transmission plan device 100. The display device is, for example, an LCD (Liquid Crystal Display), and the input device is, for example, a keyboard or a mouse. Here, the display device and the input device may be integrated and realized by a touch panel or the like.

[0016] Next, the internal configuration of the power transmission planning device 100 will be described. The power transmission planning device 100 includes a demand prediction unit 11 that calculates the predicted demand value (hereinafter referred to as the demand prediction value) of each site, a power transmission and reception planned value (hereinafter referred to as the power transmission and reception plan value) that is determined by the supply and demand planning unit 12 so that the total of the power transmission and reception amount received by the first site 311 from the second site 321 and the power purchase amount procured by the first site 311 from the retail electricity business operator satisfies the demand prediction value of the first site 311, a decarbonization index calculation unit 13 that calculates the CO2 emission amount and the amount of electricity from renewable energy (hereinafter referred to as the renewable energy electricity amount) for the power transmission and reception amount and the power purchase amount from the retail electricity business operator, a certificate cost calculation unit 14 that calculates the procurement amount of environmental certificates (hereinafter referred to as the certificate required amount) and the procurement cost (hereinafter referred to as the certificate cost) required to achieve a preset target value for at least one of the CO2 emission amount and the renewable energy electricity amount, and a power cost calculation unit 15 that calculates the transmission fee generated according to the power transmission and reception amount, the electricity fee generated according to the power purchase amount, and the power generation cost generated according to the power generation amount of the power generation facility 212 owned by the second site 321. Here, the supply and demand planning unit 12 is characterized in that it determines the power transmission and reception plan value so that the total cost including the certificate cost, the transmission fee, the electricity fee, and the power generation cost is minimized.

[0017] Here, the hardware configuration of the power transmission planning device 100 will be described with reference to FIG. 3. FIG. 3 is a block diagram showing a configuration example of a computer system that realizes the power transmission planning device 100. The power transmission planning device 100 is realized by executing a program (hereinafter referred to as the power transmission planning program) in which the processing performed by the power transmission planning device 100 on the computer system is described. As shown in FIG. 3, this computer system includes an arithmetic unit 131, a storage device 132, a communication device 133, a display controller 134, and a device controller 135, which are connected via a system bus 136. Here, FIG. 3 is an example, and the configuration of the computer system is not limited to the example of FIG. 3. In addition, although an example in which the power transmission planning device 100 is realized by a single computer system is shown, it may be realized by a plurality of computer systems or a cloud system.

[0018] The arithmetic unit 131 is a processor such as a CPU (Central Processing Unit), and executes a power transmission plan program. The storage device 132 includes various memories such as a RAM (Random Access Memory) and a storage device such as a hard disk, stores the power transmission plan program executed by the arithmetic unit 131 and necessary data obtained in the process of processing, and is used as a temporary storage area for the program. The communication device 133 is a receiver and a transmitter that perform communication processing. The display controller 134 performs control to display on the display device a display screen in the power transmission plan program executed by, for example, the arithmetic unit 131. The device controller 135 acquires an operation signal from an input device related to various setting value inputs and transmits it to the power transmission plan program executed by the arithmetic unit 131.

[0019] The supply-demand planning unit 12, the decarbonization index calculation unit 13, the certificate cost calculation unit 14, and the power cost calculation unit 15 of the power transmission plan device 100 are realized by the power transmission plan program executed by the arithmetic unit 131 shown in FIG. 3. Among the demand prediction units 11, the calculation of the demand prediction value is realized by the power transmission plan program executed by the arithmetic unit 131 shown in FIG. 3, and the data acquisition from the terminal 111 is realized by the communication device 133 shown in FIG. 3.

[0020] Returning to FIG. 2, based on the facility demand actual value acquired from the terminal 111, the demand prediction unit 11 estimates the demand prediction value of the first base point 311 at the time when the actual power supply and demand (hereinafter referred to as actual supply and demand) is performed. When the second base point 321 has the demand facility 211, the demand prediction value is similarly estimated for the second base point 321. Specifically, a prediction function with time as a parameter for the demand prediction value is set in advance for each day of the week, and the demand prediction value at the time when the actual supply and demand is performed is calculated using this function and the date and time information. Further, the demand prediction unit 11 compares the demand prediction value at the past time calculated from this function with the total value of the facility demand actual values, that is, the demand actual value of the entire base point, and corrects the difference. For example, when the demand prediction value for a certain past time is 95 kWh and the demand actual value at that time is 100 kWh, 5 kWh is added to the subsequently calculated demand prediction value for correction. Further, the demand prediction unit 11 stores the calculated demand prediction value in the storage device 132. Here, the method for calculating the prediction value is not limited to this example. The temperature acquired from the weather information server may be included as a parameter of the prediction function. A prediction function may be set for each facility to calculate the facility demand prediction value, which is corrected by the facility demand actual value and then totaled to calculate the demand prediction value of the entire base point.

[0021] The supply and demand planning unit 12 formulates a power transmission and reception plan value such that the total of the power transmission and reception amount received on consignment from the second base point 321 and the power purchase amount from the retail electricity business operator satisfies the demand prediction value of the first base point 311, and the total cost including the certificate cost, the power transmission fee, the electricity fee related to power purchase, and the power generation cost of the second base point 321 is minimized. Here, in FIG. 1, one example of the second base 321 was shown, but the present invention is not limited to this example, and two or more second bases 321 may exist, and the first base 311 may receive a consignment from a plurality of second bases 321. Therefore, the above total cost can be expressed as in Equation (1) using a variable i that specifies which of the plurality of second bases 321 it is. In Equation (1), since the certificate cost, the consignment fee, the power generation cost, and the electricity fee are based on the consignment received power amount as a variable, the above processing performed by the supply-demand planning unit 12 corresponds to solving for the consignment received power amount that minimizes the total cost shown in Equation (1). Here, this solution method is not limited in any way, and for example, a suitable solution method may be appropriately selected according to the calculation accuracy and processing speed, such as the dynamic programming method.

[0022]

Number

[0023] The supply-demand planning unit 12 causes the certificate cost calculation unit 14 to calculate the certificate cost, and causes the power cost calculation unit 15 to calculate the consignment fee, the electricity fee, and the power generation cost in a shared manner. Hereinafter, this series of calculation processes, that is, the process of solving for the consignment received power amount that minimizes the total cost shown in Equation (1) will be described with reference to FIG. 4. FIG. 4 is a flowchart showing the process of calculating the minimum total cost.

[0024] The supply and demand planning unit 12 sets an initial value of the entrusted power transmission and reception amount corresponding to each second base 321 by the number I of the second bases 321 (step S01). The combination of the entrusted power transmission and reception amounts from each of the second bases 321 thus set is hereinafter referred to as a pattern of the entrusted power transmission and reception amount. Here, when power transmission and reception from a certain second base 321 is not performed, the entrusted power transmission and reception amount is set to a value of 0. Step S01 is a process of setting a pattern of the entrusted power transmission and reception amount. In FIG. 4, m is a variable that specifies one of a plurality of patterns of the entrusted power transmission and reception amounts. The supply and demand planning unit 12 outputs the set pattern of the entrusted power transmission and reception amount to the decarbonization index calculation unit 13 and the power cost calculation unit 15. Here, the initial value of each entrusted power transmission and reception amount may be arbitrarily determined. For example, in consideration of the gist of self-power transmission in which power that does not emit CO2 or emits little CO2 is exchanged by power transmission and reception, and power is purchased unavoidably if there is insufficient power, it may be set to the rated output of the power generation facility 212. However, the total value of the entrusted power transmission and reception amounts must not exceed the demand forecast value.

[0025] Furthermore, the supply and demand planning unit 12 calculates the power purchase amount according to Equation (2) and outputs it to the decarbonization index calculation unit 13 and the power cost calculation unit 15 (step S02). Equation (2) is based on the constraint condition that the total of the entrusted power transmission and reception amount and the power purchase amount satisfies the demand forecast value. Here, the entrusted power transmission and reception amount must not exceed the total value of the facility capacities of the power generation facilities 212 possessed by the second base 321, which is also a constraint condition. In addition, the constraint conditions are not limited to these. For example, an upper limit value may be added to the entrusted power transmission and reception amount in consideration of the tie-line capacity, and constraint conditions regarding the power purchase amount may be added in consideration of the contract with the retail electricity business operator.

[0026]

Number

[0027] The decarbonization index calculation unit 13 calculates the CO2 emission amount and the renewable energy power amount for the entrusted power transmission and reception amount and the power purchase amount output by the supply and demand planning unit 12, and outputs the calculated CO2 emission amount and renewable energy power amount to the certificate cost calculation unit 14 (step S03).

[0028] The CO2 emissions are calculated separately as the CO2 emissions from the transmitted power received and the CO2 emissions from the purchased electricity. When the CO2 emissions are described without special notice, the sum of these is represented. When the transmitted power received is the target, it is calculated as shown in Equation (3). In Equation (3), the fuel consumption per unit power generation may be read from the value stored in the storage device 132 in advance, or may be calculated by Equation (3a). The carbon emissions per unit fuel consumption and the conversion factor between carbon emissions and CO2 emissions may be read from the value stored in the storage device 132 in advance, or the value may be obtained from the terminal 111 via the communication device 133. In Equation (3a), the fuel consumption per unit power generation for each facility may be read from the value stored in the storage device 132 in advance, or may be obtained from the terminal 111 via the communication device 133. Also, n indicates which power generation facility 212 among the one or more power generation facilities 212 owned by the second site 321, and the number of facilities indicates the number of power generation facilities 212 owned by the second site 321. When calculating the fuel consumption per unit power generation, the calculation method is not limited to Equation (3a). The various values stored in the storage device 132 may be input by the input device, or may be obtained from the terminal 111 via the communication device 133.

[0029]

Number

[0030] Here, the part other than the transmitted power received on the right side of Equation (3), that is, the product of the fuel consumption per unit power generation, the carbon emissions per unit fuel consumption, and the conversion factor between carbon emissions and CO2 emissions, will hereinafter be referred to as the CO2 emissions conversion value. This CO2 emissions conversion value becomes zero because no fuel is used in the case of a power generation method that uses only natural energy existing in nature, such as solar power generation (hereinafter referred to as PV, the abbreviation of the English notation Photo-Voltaic) or wind power generation.

[0031] On the one hand, when the purchased electricity quantity is the target, the decarbonization index calculation unit 13 calculates the CO2 emission amount (purchased electricity) by multiplying the CO2 emission coefficient announced by the retail electricity business operator by the purchased electricity quantity as shown in formula (4). Here, the CO2 emission coefficient reads and uses the value stored in the storage device 132 in advance. The value stored in the storage device 132 may be input by the input device or may be acquired from the retail electricity business operator via the communication device 133. CO2 emission amount (purchased electricity) = purchased electricity quantity × CO2 emission coefficient …(4)

[0032] Similar to the CO2 emission amount, the renewable energy electricity quantity is calculated separately into the renewable energy electricity quantity derived from the entrusted power transmission and reception quantity and the renewable energy electricity quantity derived from the purchased electricity quantity. When the renewable energy electricity quantity is described without special notice, it represents the sum of these. When the entrusted power transmission and reception quantity is the target, the decarbonization index calculation unit 13 calculates the renewable energy electricity quantity (entrusted power transmission) as shown in formula (5). Here, the renewable energy ratio regarding the entrusted power transmission and reception quantity may read the value stored in the storage device 132 in advance, or may be calculated by formula (6) using the facility information and the facility power generation amount of the power generation facility 212 owned by the second base point 321 that is the power transmission source. In formula (6), the facility power generation amount indicates the power generation amount for each power generation facility 212, and n indicates which power generation facility 212 among one or more power generation facilities 212 owned by the second base point 321. Therefore, the sum of the products of the facility power generation amount and whether it is renewable energy corresponds to the total renewable energy electricity quantity generated at the second base point 321. The facility power generation amount is acquired from the terminal 111 via the communication device 133. Whether it is renewable energy is a value in the range from 0 to 1 indicating whether it is derived from renewable energy, and is the facility information stored in the storage device 132 in advance. For example, it is 0 for coal-fired power generation and 1 for PV, but in a power generation method such as biomass power generation where fuels derived from renewable energy and non-renewable energy can be mixed, the value is a value other than 0 and 1.

[0033]

Number

[0034]

Number

[0035] On the one hand, when the purchased electricity quantity is the target, the decarbonization index calculation unit 13 calculates the renewable energy power quantity (purchased electricity) by multiplying the purchased electricity quantity by the renewable energy ratio related to the purchased electricity quantity. This is obtained by setting i to 1 in Equation (5) and replacing "transferred power quantity" with "purchased electricity quantity". Here, the renewable energy ratio related to the purchased electricity quantity is a value published by the retail electricity business operator, and this value is stored in the storage device 132 in advance, read out, and used. The value stored in the storage device 132 may be input by the input device or obtained from the retail electricity business operator via the communication device 133.

[0036] The certificate cost calculation unit 14 calculates the required certificate quantity and certificate cost necessary for achieving a preset target value with respect to at least one of the CO2 emission quantity and the renewable energy power quantity output by the decarbonization index calculation unit 13, and outputs the calculated required certificate quantity and certificate cost to the supply-demand planning unit 12 (step S04). Here, the required certificate quantity may be described separately for the purchased electricity quantity and the transferred power quantity in the calculation process, but when it is described simply as the required certificate quantity without special notice, it represents the sum of these. This distinction is assumed because the certificate unit price may be different between the environmental certificate for the purchased electricity quantity and the environmental certificate for the transferred power quantity.

[0037] The required quantity of certificates for achieving the target value of renewable energy power (hereinafter referred to as the renewable energy power target value) can be easily calculated as shown in Equation (7) because the unit of the environmental certificate is the same as the unit of electric energy. Specifically, the certificate cost calculation unit 14 acquires the renewable energy power quantity calculated by the decarbonization index calculation unit 13, reads out the preset renewable energy power target value from the storage device 132, and calculates the required quantity of certificates (power purchase) according to Equation (7). The required quantity of certificates (consignment) is set to 0 regardless of the required quantity of certificates (power purchase). Here, when the required quantity of certificates (power purchase) calculated by Equation (7) is a negative value, it indicates that the target value has been achieved, and the required quantity of certificates (power purchase) becomes 0. Also, although the required quantity of certificates (consignment) is set to 0 regardless of the required quantity of certificates (power purchase), this is not limited to this example. An upper limit value may be set for the required quantity of certificates (power purchase), and the excess over this upper limit value may be used as the required quantity of certificates (consignment). Also, the setting of the target value is performed by inputting it through the input device and storing it in the storage device 132. Although an example of setting the target value in terms of the quantity of renewable energy power has been shown, this is not limited to this example. The target value may be set as the ratio of the quantity of renewable energy power to the total demand (i.e., the renewable energy ratio). In this case, the certificate cost calculation unit 14 multiplies the predicted demand value by the renewable energy ratio determined as the target value to obtain the quantity of renewable energy power, so that Equation (7) can be applied. Required quantity of certificates (power purchase) = Quantity of renewable energy power - Renewable energy power target value …(7)

[0038] On the other hand, the calculation of the required quantity of certificates for achieving the target value of CO2 emissions (hereinafter referred to as the CO2 emission target value) is a more complex calculation process compared to the calculation of the required quantity of certificates for achieving the renewable energy power target value. The calculation process of the required quantity of certificates for achieving this CO2 emission target value will be described in more detail with reference to FIG. 5. FIG. 5 is a flowchart showing the process by which the certificate cost calculation unit 14 calculates the required quantity of certificates for achieving the CO2 emission target value. Here, FIG. 5 shows an example where there is one second base point 321, that is, an example where there is only one consignment received power quantity and the CO2 emissions derived from the consignment received power quantity respectively.

[0039] The certificate cost calculation unit 14 acquires the CO2 emission amount calculated by the decarbonization index calculation unit 13, reads out the preset CO2 emission target value from the storage device 132, and compares their magnitudes (step S11). If the result in step S11 is YES, that is, if the CO2 emission amount exceeds the CO2 emission target value, the excess amount over the CO2 emission target is calculated based on the difference between the CO2 emission amount and the CO2 emission target value (step S12). On the other hand, if the result in step S11 is NO, that is, if the CO2 emission amount is less than or equal to the CO2 emission target value, the required certificate amount becomes 0 (step S13). Subsequently, the certificate cost calculation unit 14 compares the excess amount over the CO2 emission target with the CO2 emission amount derived from the purchased electricity amount according to formula (4) (step S14). If the result in step S14 is YES, that is, if the excess amount over the CO2 emission target is less than or equal to the CO2 emission amount derived from the purchased electricity amount, the required certificate amount (for purchased electricity) is calculated according to formula (8) (step S15). Since step S15 corresponds to the calculation process of the required certificate amount when applying the environmental certificate only to the purchased electricity amount, the required certificate amount (for entrusted power reception) becomes 0. Required certificate amount (for purchased electricity) = Excess amount over CO2 emission target ÷ CO2 emission coefficient …(8) On the other hand, if the result in step S14 is NO, that is, if the excess amount over the CO2 emission target is greater than the CO2 emission amount derived from the purchased electricity amount, the required certificate amount (for entrusted power reception) is calculated according to formula (9) (step S16). Since step S16 corresponds to the calculation process of the required certificate amount when applying the environmental certificate to the entire purchased electricity amount and a part of the entrusted power reception amount, the required certificate amount (for purchased electricity) is equal to the purchased electricity amount. The certificate cost calculation unit 14 outputs the required certificate amount calculated in step S13, S15, or S16 to the supply and demand planning unit 12. Required certificate amount (for entrusted power reception) = {Excess amount over CO2 emission target - CO2 emission amount (for purchased electricity)} ÷ CO2 emission amount conversion value …(9)

[0040] Here, in step S14, the CO2 emissions amount derived from the purchased power is used for the determination in consideration of the operation purpose of self-delivery, which is to receive power supply that does not emit CO2 or emits less CO2 by self-delivery and, unavoidably, purchase power from non-renewable energy to supplement the insufficient power. This is based on the assumption of applying the environmental certificate to the purchased power amount. On the other hand, not limited to this example, the CO2 emissions amount derived from the received power through delivery may also be used for the determination in step S14. In this case, in formula (9), the calculation is performed by replacing the CO2 emissions amount derived from the purchased power with the CO2 emissions amount derived from the received power through delivery.

[0041] Also, when there are multiple second bases 321, that is, when there are multiple received power amounts through delivery, it is necessary to distinguish between the received power amount through delivery to which the environmental certificate is applied and the received power amount through delivery to which the environmental certificate is not applied. In this case, if it is assumed that the environmental certificate is applied to the total amount of the received power amount through delivery from the first to the s-th second base 321, formula (9) can be expressed as formula (9a) using the variable s. In this case, for the received power amount through delivery from the (s + 1)-th second base 321, the environmental certificate is partially applied. Also, when the environmental certificate is applied to the total amount of all received power amounts through delivery in addition to the total amount of the purchased power amount, needless to say, the required certificate amount is equal to the sum of the purchased power amount and the total amount of the received power amount through delivery, and the calculations of formula (9) or formula (9a) are not necessary.

[0042]

Equation

[0043] In addition, in the above process where the certificate cost calculation unit 14 calculates the required amount of certificates, an example of a calculation method conforming to the GHG Protocol (GHG is an abbreviation for Green-house Gas), which assumes that the CO2 emission coefficient regarding the amount of power corresponding to the acquired environmental certificates is 0, is shown. However, the method is not limited to this example. For example, it may be a calculation method conforming to the Law Concerning the Promotion of Measures to Cope with Global Warming (hereinafter referred to as the "Global Warming Law"), in which the CO2 emissions after the application of environmental certificates are calculated as in Equation (10). At this time, regarding Equation (10), when "CO2 emissions" is replaced with "CO2 emission target value" and "the amount of acquired environmental certificates" is replaced with "required amount of certificates", and considering that the difference between the CO2 emissions and the CO2 emission target value is the excess amount of CO2 emissions exceeding the target, Equation (11) is derived through equation transformation, so that the required amount of certificates in the calculation method conforming to the Global Warming Law can be calculated. Here, the national average emission coefficient is a value published by the Agency for Natural Resources and Energy and is stored in the storage device 132 in advance using an input device. The certificate cost calculation unit 14 reads the value from the storage device 132 and uses it for calculation. CO2 emissions = CO2 emissions (consignment) + CO2 emissions (purchased electricity) - Amount of acquired environmental certificates × national average emission coefficient …(10) Required amount of certificates = Excess amount of CO2 emissions exceeding the target ÷ national average emission coefficient …(11)

[0044] Furthermore, the certificate cost calculation unit 14 calculates the certificate cost by multiplying the calculated required amount of certificates by the certificate unit price, and outputs it to the supply and demand planning unit 12. Here, the certificate unit price is acquired via the communication device 133 from at least one of the environmental certificate exchange and the environmental certificate issuing business operator. Also, for example, when the certificate unit price for the required amount of certificates (purchased electricity) is different from the certificate unit price for the required amount of certificates (consignment), the certificate cost may be calculated separately for each of the required amount of certificates (purchased electricity) and the required amount of certificates (consignment).

[0045] Returning to FIG. 4, the power cost calculation unit 15 calculates the transmission fee generated according to the transmission and reception power amount, the electricity fee generated according to the power purchase amount, and the power generation cost generated according to the power generation amount of the power generation facility 212 of the second base 321 by using the transmission and reception power amount and the power purchase amount output by the supply and demand planning unit 12, and outputs the result to the supply and demand planning unit 12 (step S05). This step S05 may be performed in parallel with steps S03 and S04. Here, since the transmission fee and the power generation cost are defined as different values for each second base 321, they are calculated for the number I of the second bases 321.

[0046] Specifically, for the transmission fee and the electricity fee, a unit price proportional to the target power amount is set by the general power transmission and distribution operator and the retail electricity operator, respectively. The power cost calculation unit 15 calculates the transmission fee and the electricity fee by using the transmission and reception power amount and the power purchase amount according to the fee calculation methods specified by the respective operators. The power generation cost is calculated as shown in Equation (12). Here, the power generation cost is the cost generated when generating the transmission and reception power amount to the first base 311 among the power generation amounts of the second base 321. In Equation (12), the power generation cost is defined only by the fuel cost, but the calculation method of the power generation cost is not limited to this example, and the maintenance cost and depreciation cost of the power generation facility 212 may be apportioned according to the transmission and reception power amount and added. Also, the fuel consumption per unit power generation amount may be read from the value stored in the storage device 132 in advance, or may be calculated by Equation (3a). When calculating by Equation (3a), the fuel consumption per unit power generation amount for each facility may be read from the value stored in the storage device 132 in advance, or may be acquired from the terminal 111 via the communication device 133. Also, the fuel unit price may be stored in the storage device 132 in advance using the input device and the value may be read, or the actual value output by the terminal 111 via the communication device 133 may be acquired.

[0047]

Number

[0048] Here, when the supply areas of the general power transmission and distribution operators to which the first base 311 belongs are different from those of the general power transmission and distribution operators to which the second base 321 belongs, a JEPX trading fee (JEPX is an abbreviation for Japan Electric Power Exchange, the English notation for the Japan Power Exchange) corresponding to the usage fee of the tie line connecting these supply areas is further required. For this reason, the power cost calculation unit 15 may calculate the JEPX trading fee in addition to the entrusted power fee, electricity fee, and power generation cost. The JEPX trading fee is also a unit price proportional to the target power quantity, and the power cost calculation unit 15 calculates the JEPX trading fee using the power quantity to be entrusted to different supply areas among the entrusted power reception quantities.

[0049] The supply and demand planning unit 12 calculates the total cost by formula (1) using the certificate cost calculated in step S05, the entrusted power fee, electricity fee, and the power generation cost of the second base 321 calculated in step S06, and stores it in the storage device 132 (step S06). Here, when storing the total cost in the storage device 132, the supply and demand planning unit 12 stores the entrusted power reception quantity, power purchase quantity, and the required certificate quantity in this case in the storage device 132 in association with each other. Furthermore, the supply and demand planning unit 12 changes the pattern of the entrusted power reception quantity output to the decarbonization index calculation unit 13 and the power cost calculation unit 15, and repeatedly executes the processes of S00 to S06. Here, the pattern may be all combinations of entrusted power reception quantities that satisfy the constraint conditions, or a part thereof. Also, for such processing, for example, when using the dynamic programming method, the intermediate results calculated in each step may be stored in the storage device 132 and reused in the calculation of the next loop. Thereby, the calculation load can be reduced and the processing speed can be improved.

[0050] Furthermore, the supply-demand planning unit 12 selects the minimum value from the total costs stored in the storage device 132, and determines the entrusted power transmission and reception amount associated with the minimum total cost as the entrusted power transmission and reception planned value (step S07). Here, the supply-demand planning unit 12 stores the determined entrusted power transmission and reception planned value in the storage device 132, and outputs the required certificate amount and certificate cost corresponding to these planned values to the certificate procurement unit 31 and the notification unit 32. Further, similar to the entrusted power transmission and reception planned value, the supply-demand planning unit 12 may further determine the power purchase amount associated with the minimum total cost as the planned value of the power purchase amount (hereinafter, the power purchase planned value), and store it in the storage device 132.

[0051] Here, the process of step S06 of storing the total cost in the storage device 132 may be performed only when it is smaller than the total cost calculated last time, that is, only the minimum total cost is stored in the storage device 132, and the process of step S07 of selecting the minimum total cost may be omitted.

[0052] Returning to FIG. 2, in addition to the above configuration, the power transmission planning device 100 includes a power generation facility control unit 21 that controls the output of the power generation facility 212, a certificate procurement unit 31 that procures environmental certificates by at least one of purchase from an environmental certificate issuing operator and transactions at an environmental certificate exchange, and a notification unit 32 that performs a notification operation when at least one of the required certificate amount and the certificate cost exceeds a preset threshold value.

[0053] Here, in comparison with the hardware configuration shown in FIG. 3, various arithmetic processes performed by the power generation facility control unit 21, the certificate procurement unit 31, and the notification unit 32 are realized by a power transmission planning program executed by the arithmetic device 131. Further, the transmission of the control signal to the terminal 111 performed by the power generation facility control unit 21 and the communication related to the certificate procurement with the environmental certificate exchange or the environmental certificate issuing operator performed by the certificate procurement unit 31 are realized by the communication device 133. Further, the control of the display device for the screen display performed by the notification unit 32 is realized by the display controller 134.

[0054] Returning to FIG. 2, the power generation facility control unit 21 calculates the required power generation amount of the power generation facility 212 owned by the second base 321 and controls the output of the power generation facility 212. Specifically, the power generation facility control unit 21 reads out the entrusted power transmission and reception planned value formulated by the supply and demand planning unit 12 from the storage device 132 and uses this as the required power generation amount of the power generation facility 212. Further, the power generation facility control unit 21 transmits a control signal indicating the calculated required power generation amount to the terminal 111 of the second base 321 via the communication device 133. The power generation facility 212 under the control of the terminal 111 that has received the control signal controls its output so as to satisfy the required power generation amount indicated by the control signal as much as possible. For example, in the case where the power generation facility 212 is a power generation facility having a synchronous generator such as a diesel generator, an AVR (Automatic Voltage Regulator, not shown) that controls the field current increases or decreases the field current so as to satisfy the required power generation amount indicated by the received control signal, and controls the output power of the power generation facility 212. Here, when there are a plurality of power generation facilities 212, for example, further control may be performed so as to share the output power based on the facility capacity of the power generation facility 212.

[0055] The certificate procurement unit 31 procures environmental certificates corresponding to the required amount of certificates by at least either trading at an environmental certificate exchange or purchasing from an environmental certificate issuing business operator. Specifically, the certificate procurement unit 31 acquires at least either the required amount of certificates (power purchase) or the required amount of certificates (entrusted transmission) output by the supply and demand planning unit 12. Further, the certificate procurement unit 31 outputs a signal representing a purchase request for environmental certificates to the environmental certificate exchange or the environmental certificate issuing business operator via the communication device 133 regarding the required amount of certificates (power purchase), the required amount of certificates (entrusted transmission), or both, and procures environmental certificates. Among the plurality of types of environmental certificates, for example, non-fossil certificates are traded at JEPX as an environmental certificate exchange. In this case, the certificate procurement unit 31 outputs a signal representing a purchase request for the required amount of certificates to JEPX via the communication device 133 to place a bid and procures environmental certificates.

[0056] The notification unit 32 performs a notification operation when at least one of the required quantity of certificates and the certificate cost exceeds their respective preset thresholds. Specifically, the notification unit 32 acquires the required quantity of certificates and the certificate cost output by the supply-demand planning unit 12, reads out the respective thresholds previously stored in the storage device 132, and compares their magnitudes. When the required quantity of certificates exceeds the threshold, the notification unit 32 generates a screen display indicating the excess and performs control to display the screen display on the display device to the display controller 134. The notification operation regarding the certificate cost is the same. Here, an example of displaying on the display device that the threshold has been exceeded has been shown, but it is not limited to this example, and an LED (Light Emitting Diode) may be separately provided and made to light up or blink. Also, the preset threshold is input by the input device and stored in the storage device 132. Further, this threshold may distinguish between the required quantity of certificates (purchased electricity) and the required quantity of certificates (entrusted power transmission) and be set for each of them.

[0057] In this way, the demand prediction unit 11 calculates the demand prediction value, the supply-demand planning unit 12 formulates the entrusted power reception and transmission plan value so that the total of the entrusted power reception and transmission quantity and the purchased electricity quantity satisfies the demand prediction value, the decarbonization index calculation unit 13 calculates the CO2 emission quantity and the renewable energy power quantity for the entrusted power reception and transmission quantity and the purchased electricity quantity from the retail electricity business operator, the certificate cost calculation unit 14 calculates the required quantity of environmental certificates and the procurement cost necessary for achieving the decarbonization index target including at least one of the CO2 emission quantity and the renewable energy power quantity, the power cost calculation unit 15 calculates the entrusted power fee, the electricity fee, and the power generation cost, and further, the supply-demand planning unit 12 formulates the entrusted power reception and transmission plan value so that the total cost of the certificate cost calculated by the certificate cost calculation unit 14, the entrusted power fee, the electricity fee, and the power generation cost calculated by the power cost calculation unit 15 is minimized. Therefore, it is possible to provide the power transmission planning device 100 that can create a transmission plan that minimizes the total cost including the certificate cost in addition to the entrusted power fee, the electricity fee, and the power generation cost while achieving the target value regarding the CO2 emission quantity, the power quantity derived from renewable energy, or both.

[0058] Although one example of the first base 311 has been shown, the present invention is not limited to this example, and two or more first bases 311 may exist. In this case, the power transmission plan device 100 may perform the same processing for each of the plurality of first bases 311. That is, under the constraint conditions of supply-demand balance, the power transmission and reception amounts that minimize the total cost shown in Equation (1) may be solved for the number of first bases 311. Thereby, even when there are a plurality of first bases 311 that receive power transmission, the power transmission and reception planned values for each base can be determined so that the cost for each base is minimized. Alternatively, the power transmission plan device 100 may regard the plurality of first bases 311 as one wide-area base and perform the same processing for the wide-area base. That is, under the constraint conditions of supply-demand balance for each first base 311, only one power transmission and reception amount that minimizes the total cost may be solved. In this case, the total cost can be expressed as in Equation (1a) using the variable k indicating a specific first base 311. Thus, even when a plurality of demand bases are installed dispersedly, the power transmission and reception planned values that achieve overall optimization can be determined.

[0059]

Number

[0060] In addition, although an example has been shown in which the power cost calculation unit 15 performs a notification operation when at least one of the certificate requirement amount and the certificate cost calculated by the certificate cost calculation unit 14 exceeds each preset threshold value, the present invention is not limited to this example, and a notification operation may be performed when the power transmission fee, the electricity fee, and the power generation cost calculated by the power cost calculation unit 15 exceed each preset threshold value. Thereby, it becomes possible to perform a notification operation regarding the cost related to all supply powers that cover the demand amount of each base.

[0061] Embodiment 2. Embodiment 2 will be described in detail with reference to FIGS. 6 and 7. FIG. 6 is a schematic diagram showing the configuration of the first base 311 and the second base 321 in Embodiment 2, and FIG. 7 is a block diagram showing the power transmission planning device 100 in Embodiment 2. In Embodiment 2, the first base 311 has a self-base power generation facility 213 capable of output adjustment, and the power transmission planning device 100 is different from Embodiment 1 in that it controls the self-base power generation facility 213. Here, among the components shown in FIGS. 6 and 7, those with the same reference numerals as FIGS. 1 and 2 indicate the same or corresponding parts, and the description thereof will be omitted.

[0062] In FIG. 6, the first base 311 has a self-base power generation facility 213 in addition to the demand facility 211. That is, the first base 311 according to Embodiment 2 can not only receive power transmission from the second base 321 and procurement from a retail electricity business operator as in Embodiment 1, but also use the generated power of the self-base power generation facility 213. Here, FIG. 6 shows an example in which the first base 311 has only one demand facility 211 and one self-base power generation facility 213, but is not limited to this example, and may have two or more demand facilities 211 or two or more self-base power generation facilities 213.

[0063] In FIG. 7, in the power transmission planning device 100 according to Embodiment 2, the power generation facility control unit 21 is connected to the terminal 111 of the first base 311. The other configurations are the same as those in Embodiment 1, and the description of the same configurations will be omitted.

[0064] The terminal 111 can output the facility demand actual value of the demand facility 211, the facility power generation actual value of the power generation facility 212, and the facility power generation actual value of the self-base power generation facility 213. Corresponding to FIG. 6, the terminal 111 installed at the first base 311 outputs the facility demand actual value of the demand facility 211 and the facility power generation actual value of the self-base power generation facility 213. The terminal 111 installed at the second base 321 outputs the facility power generation actual value of the power generation facility 212 as in Embodiment 1.

[0065] The supply and demand planning unit 12 formulates a power transmission and reception plan value and a self-site power generation plan value (hereinafter referred to as the self-site power generation plan value) such that the total of the power transmission and reception amount received from the second site 321, the power purchase amount from the retail electricity business operator, and the power generation amount of the self-site power generation facility 213 (hereinafter referred to as the self-site power generation amount) satisfies the demand prediction value, and the total cost including the certificate cost, the power transmission fee, the electricity fee, the power generation cost of the second site 321, and the power generation cost generated according to the self-site power generation amount (hereinafter referred to as the self-site power generation cost) is minimized. Here, in FIG. 6, an example of one second site 321 is shown, but it is not limited to this example, and two or more second sites 321 may exist, and the first site 311 may receive power transmission from a plurality of second sites 321. Therefore, the above total cost can be expressed as in Equation (13) using the variable i that identifies which of the plurality of second sites 321 it is. In Equation (13), since the certificate cost, the power transmission fee, the power generation cost, the electricity fee, and the self-site power generation cost are functions of at least either the power transmission and reception amount or the self-site power generation amount as variables, the above processing performed by the supply and demand planning unit 12 corresponds to solving for the power transmission and reception amount and the self-site power generation amount that minimize the total cost shown in Equation (13). Here, this solution method is not limited in any way, similar to the solution method of Equation (1), and a suitable solution method may be appropriately selected according to the calculation accuracy and processing speed.

[0066]

Number

[0067] The supply and demand planning unit 12 is the same as in Embodiment 1 in that it causes the certificate cost calculation unit 14 to calculate the certificate cost and the power cost calculation unit 15 to calculate the power transmission fee, the electricity fee, and the power generation cost in a shared manner. In addition, the supply and demand planning unit 12 further causes the power cost calculation unit 15 to calculate the self-site power generation cost. Hereinafter, this series of calculation processes, that is, the process of solving for the power transmission and reception amount and the self-site power generation amount that minimize the total cost shown in Equation (13) will be described with reference to FIG. 8. FIG. 8 is a flowchart showing a part of the process for obtaining the minimum total cost in Embodiment 2.

[0068] Similar to step S01 in Embodiment 1, the supply-demand planning unit 12 sets initial values of the entrusted power transmission and reception amounts corresponding to each of the second bases 321, in number I, of the second bases 321 (step S31). Furthermore, the supply-demand planning unit 12 sets an initial value of the on-site power generation amount (step S32). The set on-site power generation amount is output to the decarbonization index calculation unit 13 and the power cost calculation unit 15. Here, the initial value of the on-site power generation amount may be arbitrarily determined.

[0069] Furthermore, the supply-demand planning unit 12 calculates the power purchase amount according to Equation (14) and outputs it to the decarbonization index calculation unit 13 and the power cost calculation unit 15 (step S33). Equation (14) is based on the constraint condition that the sum of the entrusted power transmission and reception amount, the power purchase amount, and the on-site power generation amount satisfies the demand prediction value. Here, as the same constraint condition as in Embodiment 1, the entrusted power transmission and reception amount shall not exceed the total value of the installed capacities of the power generation facilities 212 of the second bases 321. Similarly, the on-site power generation amount shall not exceed the total value of the installed capacities of the on-site power generation facilities 213 of the first base 311, which is also a constraint condition. Also, the constraint conditions are not limited to these, and further constraint conditions may be added as in Embodiment 1.

[0070]

Number

[0071] In addition to the entrusted power transmission and reception amount and the power purchase amount, the decarbonization index calculation unit 13 further includes the on-site power generation amount as a target to calculate the CO2 emission amount and the renewable energy power amount, and outputs the calculated CO2 emission amount and renewable energy power amount to the certificate cost calculation unit 14 (step S34). The CO2 emissions and renewable energy power generation amount related to the transmitted and received power amount and the purchased power amount can be calculated in the same manner as in Embodiment 1 using the transmitted and received power amount and the purchased power amount obtained from the demand and supply planning unit 12. The CO2 emissions of the on-site power generation amount can be calculated by substituting i with 1 representing the on-site location (the number of on-site locations I = 1) and replacing "transmitted and received power amount" with "on-site power generation amount" in Equation (3). The renewable energy power generation amount of the on-site power generation amount can be calculated by substituting i with 1 representing the on-site location (the number of on-site locations I = 1) and replacing "transmitted and received power amount" with "on-site power generation amount" in Equation (5). The renewable energy ratio related to the on-site power generation amount may be read from a value pre-stored in the storage device 132, or may be calculated by Equation (6) using the equipment information and the equipment power generation amount of the on-site power generation facility 213. In this way, the CO2 emissions and the renewable energy power generation amount are calculated for each of the transmitted and received power amount, the purchased power amount, and the on-site power generation amount. However, when specifically referring to the CO2 emissions or the renewable energy power generation amount without special notice, it represents the sum of those calculated for each of the transmitted and received power amount, the purchased power amount, and the on-site power generation amount.

[0072] Similar to Embodiment 1, the certificate cost calculation unit 14 calculates the required certificate quantity and the certificate cost necessary to achieve a preset target value for at least one of the CO2 emissions and the renewable energy power generation amount output by the decarbonization index calculation unit 13, and outputs the calculated required certificate quantity and the certificate cost to the demand and supply planning unit 12 (step S35). Here, the required certificate quantity may be described separately as related to the purchased power amount and as related to the transmitted and received power amount and the on-site power generation amount in the process of calculation. However, when specifically referring to the required certificate quantity without special notice, it represents the sum of these. This distinction is assumed because the certificate unit price may differ between the environmental certificate related to the purchased power amount and the environmental certificate related to the transmitted and received power amount and the on-site power generation amount.

[0073] Of the certificate required quantity for achieving the renewable energy power target value, the certificate required quantity (purchased power) is calculated by Equation (7) in the same manner as in Embodiment 1. The certificate required quantity (consignment + on-site power generation) is set to 0 regardless of the certificate required quantity (purchased power). Here, when the certificate required quantity (purchased power) calculated by Equation (7) becomes a negative value, it indicates that the target value has been achieved, and the certificate required quantity (purchased power) becomes 0. Also, although the certificate required quantity (consignment + on-site power generation) is set to 0 regardless of the certificate required quantity (purchased power), this is not limited to this example, and an upper limit value may be set for the certificate required quantity (purchased power), and the amount exceeding this upper limit value may be used as the certificate required quantity (consignment + on-site power generation). Also, similar to Embodiment 1, the target value may be set as a renewable energy ratio instead of the renewable energy power amount. In this case, the certificate cost calculation unit 14 multiplies the demand prediction value by the renewable energy ratio determined as the target value to obtain the renewable energy power amount, so that Equation (7) can be applied.

[0074] The calculation process of the certificate required quantity for achieving the CO2 emission target value will be described in more detail with reference to FIG. 9. FIG. 9 is a flowchart showing a part of the process in which the certificate cost calculation unit 14 calculates the certificate required quantity for achieving the CO2 emission target value in Embodiment 2. Here, FIG. 9 shows an example where the second base 321 is one example, that is, an example where there is only one consignment power reception amount and the CO2 emission amount derived from the consignment power reception amount respectively.

[0075] The certificate cost calculation unit 14 performs the processes up to steps S11 to S14 in Embodiment 1. If YES in step S14, that is, when the CO2 emission excess amount is less than or equal to the CO2 emission amount derived from the purchased power amount, the process of step S15 is continued, and the certificate required quantity (purchased power) can be calculated. In this case, the certificate required quantity (consignment + on-site power generation) becomes 0. On the other hand, when the answer in step S14 is NO, the certificate cost calculation unit 14 determines whether the amount obtained by subtracting the CO2 emissions from the purchased power from the excess CO2 emissions target is less than or equal to the CO2 emissions from the on-site power generation (step S21). If the answer in step S21 is YES, the calculation of formula (15) (step S22) is performed. If the answer in step S21 is NO, the calculation of formula (16) (step S23) is performed, thereby calculating the required certificate quantity (subcontracted + on-site power generation). Here, step S22 corresponds to the calculation process of the required certificate quantity when applying environmental certificates to the total amount of purchased power and a part of the on-site power generation. Also, step S23 corresponds to the calculation process of the required certificate quantity when applying environmental certificates to the total amount of purchased power, the total amount of on-site power generation, and a part of the subcontracted received power. In either case of steps S22 and S23, the required certificate quantity (purchased power) is equal to the purchased power. Also, the CO2 emissions (purchased power + on-site power generation) represent the sum of the CO2 emissions from the purchased power and the CO2 emissions from the on-site power generation. Required certificate quantity (subcontracted + on-site power generation) = {Excess CO2 emissions target - CO2 emissions (purchased power)} ÷ CO2 emissions conversion value (on-site power generation) …(15) Required certificate quantity (subcontracted + on-site power generation) = {Excess CO2 emissions target - CO2 emissions (purchased power + on-site power generation)} ÷ CO2 emissions conversion value (subcontracted) + on-site power generation amount …(16)

[0076] Here, in the calculation of the required certificate quantity, the determination was made in the order of the CO2 emissions from the purchased power (step S14) and the CO2 emissions from the on-site power generation (step S21). However, this is not limited to this example, and this order may be reversed, or the determination may be made using the CO2 emissions from the subcontracted received power.

[0077] Also, when there are multiple second bases 321, that is, when there are multiple amounts of power received and transmitted on consignment, it is necessary to distinguish between the amount of power received and transmitted on consignment to which the environmental certificate is applied and the amount of power received and transmitted on consignment to which the environmental certificate is not applied. In this case, if it is assumed that the environmental certificate is applied to the total amount of the power received and transmitted on consignment from the first to the s-th second base 321, Equation (16) can be expressed as Equation (16a) using the variable s. In this case, for the amount of power received and transmitted on consignment from the (s + 1)-th second base 321, the environmental certificate will be partially applied. Also, in addition to the total amount of power purchased and the total amount of power generated at the own base, when the environmental certificate is applied to the total amount of all the power received and transmitted on consignment, needless to say, the environmental certificate is equal to the sum of the power purchased, the power generated at the own base, and the total amount of the power received and transmitted on consignment, and the calculations of Equation (16) or Equation (16a) are unnecessary.

[0078] [Number]

[0079] Also, in the above process where the certificate cost calculation unit 14 calculates the required amount of certificates, an example of a calculation method conforming to the GHG protocol that regards the CO2 emission coefficient for the amount of power for which the environmental certificate is procured as 0 is shown, but it is not limited to this example. For example, similar to Embodiment 1, a calculation method conforming to the temperature difference method may be used.

[0080] Furthermore, the certificate cost calculation unit 14 calculates the certificate cost by multiplying the calculated required amount of certificates by the certificate unit price, and outputs it to the supply and demand planning unit 12. Here, the certificate unit price is acquired via the communication device 133 from at least one of the environmental certificate exchange and the environmental certificate issuing business operator. Also, for example, when the certificate unit price of the required amount of certificates (power purchase) is different from the required amount of certificates (transmission + power generation at the own base), the certificate cost may be calculated separately for each of the required amount of certificates (power purchase) and the required amount of certificates (transmission + power generation at the own base).

[0081] Returning to FIG. 8, the power cost calculation unit 15 calculates the transmission fee, electricity fee, power generation cost of the second base 321, and self-base power generation cost using the entrusted power transmission amount, power purchase amount, and self-base power generation amount output by the supply and demand planning unit 12, and outputs them to the supply and demand planning unit 12 (step S36). This step S36 may be performed in parallel with steps S34 and S35. Here, since the transmission fee and power generation cost are defined as different values for each second base 321, they are calculated for the number I of the second bases 321. Here, the calculation methods of the transmission fee, electricity fee, and power generation cost of the second base 321 are the same as those in Embodiment 2. The self-base power generation cost can be calculated by substituting i = 1 representing the self-base (the number I of self-bases = 1) and reading "entrusted power transmission amount" as "self-base power generation amount" in Equation (12). Also, in Equation (12), the fuel usage amount per unit power generation amount and the fuel unit price may be stored in the storage device 132 in advance using the input device and their values read out, or the actual values output by the terminal 111 via the communication device 133 may be acquired.

[0082] The supply and demand planning unit 12 calculates the total cost according to Equation (13) using the certificate cost calculated in step S35 and the transmission fee, electricity fee, power generation cost of the second base 321, and self-base power generation cost calculated in step S36, and stores it in the storage device 132 (step S37). Here, when storing the total cost in the storage device 132, the supply and demand planning unit 12 stores the entrusted power transmission amount, power purchase amount, self-base power generation amount used in the calculation, and the certificate required amount in this case in the storage device 132 in an associated manner.

[0083] Furthermore, similar to Embodiment 1, the supply and demand planning unit 12 changes the pattern of the entrusted power transmission amount and the self-base power generation amount output to the decarbonization index calculation unit 13 and the power cost calculation unit 15 so as to satisfy the constraint conditions, and repeatedly performs the processes of S31 to S37.

[0084] Furthermore, similar to step S07 of Embodiment 1, the supply and demand planning unit 12 selects the minimum value from the total costs stored in the storage device 132, determines the power transmission and reception planned value associated with the minimum total cost as the power transmission and reception planned value, and determines the on-site power generation planned value associated with the minimum total cost as the on-site power generation planned value (step S38). Here, the supply and demand planning unit 12 stores the determined power transmission and reception planned value and on-site power generation planned value in the storage device 132, and outputs the certificate required quantity and certificate cost corresponding to these planned values to the certificate procurement unit 31 and the notification unit 32. In addition, similar to the power transmission and reception planned value and on-site power generation planned value, the supply and demand planning unit 12 may further determine the power purchase planned value associated with the minimum total cost, and store it in the storage device 132.

[0085] Returning to FIG. 7, in addition to controlling the output of the power generation facility 212 of the second base 321, the power generation facility control unit 21 controls the output of the on-site power generation facility 213 of the first base 311. Specifically, the power generation facility control unit 21 reads the on-site power generation planned value formulated by the supply and demand planning unit 12 from the storage device 132, and transmits a control signal indicating the on-site power generation planned value to the terminal 111 of the first base 311 via the communication device 133. The on-site power generation facility 213 subordinate to the terminal 111 that has received the control signal controls its output so as to satisfy the on-site power generation planned value indicated by the control signal as much as possible. Here, when there are a plurality of on-site power generation facilities 213, for example, the output power may be further controlled so as to be shared based on the equipment capacity of the on-site power generation facilities 213.

[0086] Similarly, the power transmission planning device 100 configured as described above can create a transmission plan that minimizes the total cost including the certificate cost in addition to the transmission fee, electricity fee, and power generation cost while achieving the target values regarding the CO2 emissions, the amount of power derived from renewable energy, or both. Further, since the self-site power generation planning value is determined by the supply-demand planning unit 12 and the output of the self-site power generation facility 213 can be controlled by the power generation facility control unit 21, it is possible to create a transmission plan that minimizes the above total cost for the first site 311 having the self-site power generation facility 213, and it is possible to control the output of the self-site power generation facility 213 based on the self-site power generation planning value.

[0087] Modification Example of Embodiment 2 The modification example of Embodiment 2 will be described in detail with reference to FIG. 10. FIG. 10 is a block diagram showing the performance monitoring function of the power transmission planning device 100. The power transmission planning device 100 of this modification example has a performance monitoring function of controlling the self-site power generation facility 213 based on various performance values acquired from the terminal 111 in addition to the configuration of determining the transmission and reception planning values and the self-site power generation planning value of Embodiment 2 and controlling the output of the self-site power generation facility 213. Here, in FIG. 10, those having the same reference numerals as the respective configurations shown in FIG. 7 indicate the same or corresponding parts. Further, although FIG. 10 shows only the configuration related to the performance monitoring function, it may further include the demand prediction unit 11, the supply-demand planning unit 12, and the power cost calculation unit 15 shown in FIG. 7.

[0088] The terminal 111 installed at the first site 311 outputs the facility demand performance value of the demand facility 211 and the facility power generation performance value of the self-site power generation facility 213, in addition to the performance value of the transmission and reception power amount received from the second site 321 (hereinafter referred to as the transmission and reception performance value) and the performance value of the power purchase amount from the retail electricity business operator (hereinafter referred to as the power purchase performance value).

[0089] When a difference occurs in at least any one of between the demand prediction value and the demand performance value, between the transmission and reception planning value and the transmission and reception performance value, and between the power purchase planning value and the power purchase performance value, the power generation facility control unit 21 controls the output of the self-site power generation facility 213 so as to eliminate the difference.

[0090] Specifically, the power generation facility control unit 21 sums up the facility demand actual values output by the terminal 111 for the number of demand facilities 211 to calculate the demand actual value, subtracts the demand prediction value stored in the storage device 132 from the demand actual value to calculate the difference (hereinafter referred to as the demand increase amount). Since the demand increase amount is literally the increase amount of the demand quantity, it contributes to the deficit side of the power supply and demand. Further, the power generation facility control unit 21 calculates the difference (hereinafter referred to as the entrusted power transmission increase amount) by subtracting the entrusted power transmission planned value stored in the storage device 132 from the entrusted power transmission actual value output by the terminal 111, and calculates the difference (hereinafter referred to as the purchased power increase amount) by subtracting the purchased power planned value stored in the storage device 132 from the purchased power actual value output by the terminal 111. Since the entrusted power transmission increase amount and the purchased power increase amount are the increase amounts of the procurement quantity, they contribute to the surplus side of the power supply and demand. Furthermore, the power generation facility control unit 21 calculates the required power generation amount of the on-site power generation facility 213 as shown in Equation (17), and controls the output of the on-site power generation facility 213 so as to satisfy the required power generation amount. Here, when there are a plurality of on-site power generation facilities 213, for example, further control may be performed so as to share the output power based on the facility capacity of the power generation facility 212. Required power generation amount = Demand increase amount - (Entrusted power transmission increase amount + Purchased power increase amount) …(17)

[0091] The decarbonization index calculation unit 13 recalculates the CO2 emission amount and the renewable energy power amount for the entrusted power transmission actual value, the purchased power actual value, and the actual value of the on-site power generation amount (hereinafter referred to as the on-site power generation actual value) output by the terminal 111, and outputs them to the certificate cost calculation unit 14. These calculation methods are the same as those in Embodiment 2.

[0092] The certificate cost calculation unit 14 recalculates the required certificate quantity and the certificate cost required to achieve the respective preset target values for at least either the CO2 emission amount and the renewable energy power amount recalculated by the decarbonization index calculation unit 13, and outputs them to the certificate procurement unit 31 and the notification unit 32. These calculation methods are the same as those in Embodiment 2.

[0093] The certificate procurement unit 31 procures environmental certificates corresponding to the required quantity of certificates recalculated by the certificate cost calculation unit 14. The procurement method is the same as in Embodiments 1 and 2. The notification unit 32 performs a notification operation when at least either the required quantity of certificates or the certificate cost recalculated by the certificate cost calculation unit 14 exceeds each preset threshold value. The detailed notification operation is the same as in Embodiments 1 and 2.

[0094] Similarly, the power transmission plan device 100 configured in this way can create a transmission plan and a self-supplying power generation plan that minimize the total cost including the certificate cost in addition to the transmission fee, electricity fee, and power generation cost while achieving the target values related to the CO2 emission amount, the amount of power derived from renewable energy, or both. Furthermore, since the terminal 111 outputs the actual values of power transmission and reception and the actual values of power purchase, and the power generation facility control unit 21 controls the output of the self-supplying power generation facility 213 so as to eliminate the difference between the predicted value of the demand amount, the planned value of the power transmission and reception amount, and the planned value of the power purchase amount and their respective actual values, the self-supplying power generation facility 213 can compensate for the variation even when there is a variation in any of the actual values. Also, the decarbonization index calculation unit 13 recalculates the CO2 emission amount and the renewable energy power amount for various actual values, and the certificate cost calculation unit 14 calculates the required quantity of certificates and the certificate cost based on the recalculated CO2 emission amount and renewable energy power amount, so that the actual value of the certificate cost can be presented.

[0095] In this modification example, a power cost calculation unit 15 may be provided to recalculate the power generation cost based on the actual value of self-supplying power generation. In this case, a threshold value related to the power generation cost may be set in advance, and when the recalculated power generation cost exceeds the threshold value, the notification unit 32 may further perform a notification operation.

[0096] Embodiment 3. Embodiment 3 will be described in detail with reference to FIGS. 11 and 12. FIG. 11 is a schematic diagram showing the configurations of the first base 311 and the second base 321 in Embodiment 3, and FIG. 12 is a block diagram showing the power transmission planning device 100 in Embodiment 3. In Embodiment 3, the first base 311 has a power storage facility 214, and the power transmission planning device 100 is different from Embodiment 1 in that it controls the power storage facility 214. Here, among the components shown in FIGS. 11 and 12, those with the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts, and the description thereof will be omitted.

[0097] In FIG. 11, the first base 311 has a power storage facility 214 in addition to the demand facility 211. That is, the first base 311 according to Embodiment 3 can not only receive power transmission from the second base 321 and procurement from the retail electricity business operator as in Embodiment 1, but also use the discharge power of the power storage facility 214. Here, FIG. 11 shows an example in which the first base 311 has only one demand facility 211 and one self-base power generation facility 213, but the present invention is not limited to this example, and it may have two or more demand facilities 211 or two or more power generation facilities 212.

[0098] In FIG. 12, the power transmission planning device 100 according to Embodiment 3 further includes a power storage facility management unit 22 that stores the power storage amount and charge / discharge history of the power storage facility 214 and calculates the CO2 emission amount and renewable energy amount included in the power storage amount, and a power storage facility control unit 23 that controls the charge / discharge of the power storage facility 214. Other configurations are the same as those in Embodiment 1, and the description of the same configurations will be omitted.

[0099] Here, in comparison with the hardware configuration shown in FIG. 3, among the power storage facility management unit 22, for example, calculations such as the calculation of CO2 emissions and the amount of renewable energy power are realized by the power transmission plan program executed by the arithmetic unit 131, and the storage of the stored power amount and the charge / discharge history is realized by the storage device 132. Among the power storage facility control unit 23, the calculations related to the control of charge and discharge are realized by the power transmission plan program executed by the arithmetic unit 131, and the transmission of the control signal to the terminal 111 is realized by the communication device 133. Also, for both the power storage facility management unit 22 and the power storage facility control unit 23, the acquisition of data from the terminal 111 is realized by the communication device 133.

[0100] Returning to FIG. 12, in addition to the facility demand actual value of the demand facility 211 and the facility power generation actual value of the power generation facility 212, the terminal 111 can output the power transmission / reception actual value, the power purchase actual value, and the actual value of the charge / discharge amount of the power storage facility 214 (hereinafter referred to as the charge / discharge actual value). Corresponding to FIG. 11, the terminal 111 installed at the first base 311 outputs the facility demand actual value of the demand facility 211, the power transmission / reception actual value from the second base 321, the power purchase actual value from the retail electricity business operator, and the charge / discharge actual value of the power storage facility 214. The terminal 111 installed at the second base 321 outputs the facility power generation actual value of the power generation facility 212 in the same manner as in the first embodiment.

[0101] The power storage facility management unit 22 stores the stored power amount and the charge / discharge history of the power storage facility 214, and calculates the CO2 emissions and the amount of renewable energy power included in the stored power amount. Regarding the CO2 emissions among these, the power storage facility 214 not only stores the CO2 emissions generated during the power generation of the amount of power used for charging (hereinafter referred to as the charging amount) in addition to the amount of power, that is, it is considered that the stored power amount contains CO2 and is discharged during discharge. Therefore, it corresponds to calculating the CO2 emissions stored in the power storage facility 214.

[0102] As a specific processing operation, the power storage facility management unit 22 calculates the CO2 emissions and the amount of renewable energy power for the charging amount of the power storage facility 214 in the same manner as the decarbonization index calculation unit 13. Specifically, when the power storage facility 214 is charged by the entrusted power reception amount, the power storage facility management unit 22 calculates the CO2 emission amount for the charging amount according to Equation (3), and when the power storage facility 214 is charged by the power purchase amount, the power storage facility management unit 22 calculates the CO2 emission amount for the charging amount according to Equation (4). Here, the fuel usage per unit power generation amount, the carbon emission amount per unit fuel usage amount, the conversion coefficient between the carbon emission amount and the carbon dioxide emission amount, and the CO2 emission coefficient in Equations (3) and (4) are read from those stored in the storage device 132 in advance and used. The values stored in the storage device 132 may be input by the input device, or may be acquired from the terminal 111 or the retail electricity business operator via the communication device 133. Furthermore, the power storage facility management unit 22 calculates the renewable energy power amount according to Equation (5) for the charging amount. In this way, every time charging is performed, the power storage facility management unit 22 calculates the CO2 emission amount and the renewable energy power amount corresponding to the charging amount, and adds them to the CO2 emission amount and the renewable energy power amount included in the power storage amount before charging. The power storage facility management unit 22 stores the CO2 emission amount and the renewable energy power amount included in the power storage amount after charging calculated in this way as the charge and discharge history.

[0103] On the other hand, when the power storage facility 214 discharges, the CO2 emission amount corresponding to the discharge amount is calculated according to Equation (18). Here, similarly, the renewable energy power amount corresponding to the discharge amount can be calculated by replacing "CO2 emission amount" in Equation (18) with "renewable energy power amount". In this way, every time discharging is performed, the power storage facility management unit 22 calculates the CO2 emission amount and the renewable energy power amount corresponding to the discharge amount, and subtracts them from the CO2 emission amount and the renewable energy power amount included in the power storage amount before discharge. The power storage facility management unit 22 stores the CO2 emission amount and the renewable energy power amount included in the power storage amount after discharge calculated in this way as the charge and discharge history. CO2 emission amount corresponding to the discharge amount = CO2 emission amount included in the power storage amount before discharge × (discharge amount ÷ power storage amount before discharge) …(18)

[0104] The supply-demand planning unit 12 formulates a power transmission and reception planned value and a planned value of the discharge amount (hereinafter referred to as the discharge planned value) so that the total of the power transmission and reception amount received from the second base 321, the power purchase amount from the retail electricity business operator, and the discharge amount of the power storage facility 214 satisfies the demand prediction value, and the total cost including the certificate cost, the power transmission fee, the electricity fee, and the power generation cost of the second base 321 is minimized. Here, in FIG. 11, an example of one second base 321 is shown, but it is not limited to this example, and there may be two or more second bases 321, and the first base 311 may receive power transmission from a plurality of second bases 321. Therefore, the above total cost becomes as shown in Equation (1) in the same manner as in Embodiment 1 by using the variable i that specifies which of the plurality of second bases 321 it is. In Equation (1), since the certificate cost, the power transmission fee, the power generation cost, and the electricity fee are variables depending on at least one of the power transmission and reception amount and the discharge amount, the above processing performed by the supply-demand planning unit 12 corresponds to solving the power transmission and reception amount and the discharge amount that minimize the total cost shown in Equation (1). Here, this solution method is not limited in any way as in Embodiment 1, and a suitable solution method may be appropriately selected according to the calculation accuracy and processing speed.

[0105] The supply-demand planning unit 12 is the same as in Embodiment 1 in that it causes the certificate cost calculation unit 14 to calculate the certificate cost and the power cost calculation unit 15 to calculate the power transmission fee, the electricity fee, and the power generation cost in a shared manner. Hereinafter, this series of calculation processes, that is, the process of solving the power transmission and reception amount and the discharge amount that minimize the total cost shown in Equation (1) will be described with reference to FIG. 13. FIG. 13 is a flowchart showing a part of the process of calculating the minimum total cost in Embodiment 3.

[0106] The supply-demand planning unit 12 sets an initial value of the power transmission and reception amount corresponding to each second base 321 by the number I of the second bases 321 in the same manner as in step S01 in Embodiment 1 (step S41). Furthermore, the supply-demand planning unit 12 sets an initial value of the discharge amount (step S42). The set discharge amount is output to the decarbonization index calculation unit 13. Here, the initial value of the discharge amount may be arbitrarily determined within a range not exceeding the stored power amount of the power storage facility 214 owned by the first base 311.

[0107] Furthermore, the supply-demand planning unit 12 calculates the power purchase amount by replacing the "self-generation amount" in formula (14) with the "discharge amount", and outputs it to the decarbonization index calculation unit 13 and the power cost calculation unit 15 (step S43). This calculation of the power purchase amount is based on the constraint condition that the total of the entrusted transmission and reception amount, the power purchase amount, and the discharge amount satisfies the demand prediction value. Here, as the same constraint condition as in the first embodiment, the entrusted transmission and reception amount must not exceed the total value of the installed capacities of the power generation facilities 212 of the second base 321. Also, it is one of the constraint conditions that the discharge amount is determined within a range not exceeding the stored power amount of the power storage facility 214. Also, the constraint conditions are not limited to these, and additional constraint conditions may be added as in the first embodiment.

[0108] The decarbonization index calculation unit 13 calculates the CO2 emission amount and the renewable energy power amount by further including the discharge amount in addition to the entrusted transmission and reception amount and the power purchase amount, and outputs the calculated CO2 emission amount and renewable energy power amount to the certificate cost calculation unit 14 (step S44). The CO2 emission amount and the renewable energy power amount regarding the entrusted transmission and reception amount and the power purchase amount can be calculated in the same manner as in the first embodiment using the entrusted transmission and reception amount and the power purchase amount obtained from the supply-demand planning unit 12. The CO2 emission amount and the renewable energy power amount corresponding to the discharge amount can be calculated by formula (18) using the discharge amount obtained from the supply-demand planning unit 12. In this way, the CO2 emission amount and the renewable energy power amount are calculated for each of the entrusted transmission and reception amount, the power purchase amount, and the discharge amount. However, when particularly described as the CO2 emission amount or the renewable energy power amount without special notice, it represents the sum of those calculated for each of the entrusted transmission and reception amount, the power purchase amount, and the discharge amount.

[0109] Similar to Embodiment 1, the certificate cost calculation unit 14 calculates the required amount of certificates and the certificate cost necessary for achieving the preset target value with respect to at least either the CO2 emission amount or the renewable energy power amount output by the decarbonization index calculation unit 13, and outputs the calculated required amount of certificates and the certificate cost to the supply and demand planning unit 12 (step S45). Here, the required amount of certificates may be described separately as related to the electricity purchase amount and as related to the entrusted power reception amount and the discharge amount in the calculation process. However, when simply described as the required amount of certificates without special notice, it represents the sum of these. This distinction is assumed because the certificate unit price may differ between the environmental certificate related to the electricity purchase amount and the environmental certificate related to the entrusted power reception amount and the discharge amount. Among the required amount of certificates for achieving the renewable energy power target value, the required amount of certificates (electricity purchase) is calculated by Equation (7) in the same manner as in Embodiment 1. The required amount of certificates (entrusted + discharge) is set to 0 regardless of the required amount of certificates (electricity purchase). Here, when the required amount of certificates (electricity purchase) calculated by Equation (7) becomes a negative value, it indicates that the target value has been achieved, and the required amount of certificates (electricity purchase) becomes 0. Also, although the required amount of certificates (entrusted + discharge) is set to 0 regardless of the required amount of certificates (electricity purchase), this is not limited to this example. An upper limit value may be set for the required amount of certificates (electricity purchase), and the amount exceeding this upper limit value may be used as the required amount of certificates (entrusted + discharge). Also, similar to Embodiments 1 and 2, the target value may be set as the renewable energy ratio instead of the renewable energy power amount. In this case, the certificate cost calculation unit 14 multiplies the demand forecast value by the renewable energy ratio determined as the target value to obtain the renewable energy power amount, so that Equation (7) can be applied. The required amount of certificates for achieving the CO2 emission target value can be calculated in the same manner as in Embodiment 2 by replacing "self-site power generation amount" with "discharge amount" and "CO2 emission amount derived from self-site power generation amount" with "CO2 emission amount corresponding to the discharge amount". Furthermore, the certificate cost calculation unit 14 calculates the certificate cost by multiplying the calculated required certificate quantity by the certificate unit price, and outputs it to the supply and demand planning unit 12. Here, the certificate unit price is obtained via the communication device 133 from at least one of the environmental certificate exchange and the environmental certificate issuing operator. Also, for example, when the certificate unit price for the required certificate quantity (purchased electricity) is different from the certificate unit price for the required certificate quantity (consignment + power discharge), the certificate cost may be calculated separately for each of the required certificate quantity (purchased electricity) and the required certificate quantity (consignment + power discharge).

[0110] The power cost calculation unit 15 calculates the consignment fee, electricity fee, and power generation cost of the second base 321 using the consignment received power quantity and purchased power quantity output by the supply and demand planning unit 12, and outputs it to the supply and demand planning unit 12 (step S46). These calculation methods are the same as those in the first embodiment. This step S46 may be performed in parallel with steps S44 and S45. Here, since the consignment fee and power generation cost are defined as different values for each second base 321, they are calculated for the number I of the second bases 321.

[0111] The supply and demand planning unit 12 calculates the total cost by the formula (1) using the certificate cost calculated in step S45 and the consignment fee, electricity fee, and power generation cost of the second base 321 calculated in step S46, and stores it in the storage device 132 (step S47). Here, when storing the total cost in the storage device 132, the supply and demand planning unit 12 stores the consignment received power quantity, purchased power quantity, power discharge quantity used in the calculation, and the required certificate quantity in this case in the storage device 132 in association with each other.

[0112] Furthermore, the supply and demand planning unit 12 changes the pattern of the consignment received power quantity and the power discharge quantity output to the decarbonization index calculation unit 13 and the power cost calculation unit 15 so as to satisfy the constraint conditions, in the same manner as in the first embodiment, and repeatedly performs the processes of S41 to S47.

[0113] Furthermore, in the same manner as step S07 of Embodiment 1, the supply and demand planning unit 12 selects the minimum value from the total costs stored in the storage device 132, determines the power transmission and reception planned value associated with the minimum total cost as the power transmission and reception planned value, and determines the discharge amount associated with the minimum total cost as the discharge planned value (step S48). Here, the supply and demand planning unit 12 stores the determined power transmission and reception planned value and discharge planned value in the storage device 132, and outputs the certificate required amount and certificate cost corresponding to these planned values to the certificate procurement unit 31 and the notification unit 32. In addition, similar to the power transmission and reception planned value and the discharge planned value, the supply and demand planning unit 12 may further determine the power purchase planned value of the power purchase amount associated with the minimum cost, and store it in the storage device 132.

[0114] Returning to FIG. 12, the power storage facility control unit 23 controls the discharge output of the power storage facility 214 owned by the first base 311. Specifically, the power storage facility control unit 23 reads out the discharge planned value formulated by the supply and demand planning unit 12 from the storage device 132, and transmits a control signal indicating the discharge planned value to the terminal 111 of the first base 311 via the communication device 133. The power storage facility 214 subordinate to the terminal 111 that has received the control signal controls the output so as to satisfy the discharge planned value indicated by the control signal. More specifically, for example, a PCS (Power Conditioning System) that orthogonally converts the output power of the power storage facility 214 controls the discharge output of the power storage facility 214 so as to satisfy the discharge planned value indicated by the control signal as much as possible. Here, when there are a plurality of power storage facilities 214, for example, the control may be further performed so as to share the output power based on the facility capacity of the power storage facility 214.

[0115] Similarly, the power transmission planning device 100 configured as described above can create a transmission plan that minimizes the total cost including the certificate cost in addition to the transmission fee, electricity fee, and power generation cost while achieving the target values related to the CO2 emission amount, the amount of power derived from renewable energy, or both. Further, since the discharge plan value is determined by the supply and demand planning unit 12 and the output of the power storage facility 214 can be controlled by the power storage facility control unit 23, it is possible to create a transmission plan that minimizes the above total cost for the first base point 311 having the power storage facility 214, and to control the output of the power storage facility 214 based on the discharge plan value.

[0116] In the present embodiment, the power storage facility management unit 22 calculates the CO2 emission amount and the renewable energy power amount corresponding to the discharge amount each time discharge is performed by the formula (18), and stores the CO2 emission amount and the renewable energy power amount included in the stored power amount as the charge and discharge history. However, the present invention is not limited to this example, and the CO2 emission amount and the renewable energy power amount corresponding to the discharge amount may be arbitrarily determined with the CO2 emission amount and the renewable energy power amount included in the stored power amount before discharge as the upper limit, and the CO2 emission amount and the renewable energy power amount corresponding to the past discharge amount may be changed, and the CO2 emission amount and the renewable energy power amount included in the past stored power amount stored as the charge and discharge history may be rewritten. Specifically, for the past discharge stored as the charge and discharge history, the power storage facility management unit 22 arbitrarily determines and changes the CO2 emission amount corresponding to the discharge amount with the CO2 emission amount included in the stored power amount before discharge as the upper limit, and subtracts it from the CO2 emission amount included in the stored power amount before discharge. The power storage facility management unit 22 rewrites the CO2 emission amount included in the stored power amount after discharge recalculated in this way as the charge and discharge history for the past discharge. Here, this rewriting process can be performed for the renewable energy power amount in the same manner as the CO2 emission amount. Accordingly, in preparation for a frame at a future time when it is predicted that the supply amount of renewable energy power will decrease due to reasons such as bad weather, etc., among the past discharge amounts of the power storage facility 214, the renewable energy power amount can be reduced, and the renewable energy power amount that can be discharged at the frame at the future time can be conserved. Further, in preparation for a frame at a future time when an increase in CO2 emissions is predicted for the same reason, etc., the CO2 emissions amount corresponding to the past discharge amount of the power storage facility 214 can be increased, and the CO2 emissions amount corresponding to the discharge amount at the frame at the future time can be reduced.

[0117] Similarly, in the present embodiment, the power storage facility management unit 22 calculates the CO2 emissions amount and the renewable energy power amount corresponding to the charging amount each time charging is performed by at least any one of formulas (3), (4), and (5), and stores the CO2 emissions amount and the renewable energy power amount included in the stored power amount as a charge-discharge history. However, the present invention is not limited to this example, and the CO2 emissions amount and the renewable energy power amount corresponding to the past charging amount may be changed, and the CO2 emissions amount and the renewable energy power amount included in the past stored power amount stored as the charge-discharge history may be rewritten. Specifically, among the past charging stored as the charge-discharge history, for example, charging by the entrusted power reception amount may be changed to charging by the power purchase amount. In this case, the power storage facility management unit 22 recalculates the CO2 emissions amount corresponding to the charging amount calculated by formula (3) by formula (4), and adds it to the CO2 emissions amount included in the stored power amount before charging. Further, the power storage facility management unit 22 reads "entrusted power reception amount" as "power purchase amount" in formula (5) and recalculates the renewable energy power amount corresponding to the charging amount, and adds it to the renewable energy power amount included in the stored power amount before charging. The power storage facility management unit 22 rewrites the CO2 emissions amount and the renewable energy power amount included in the stored power amount after charging recalculated in this way as the charge-discharge history for the past charging. Charging by the entrusted power reception amount may be changed to charging by the power purchase amount. Accordingly, the amount of power used for past charging can be changed so as to increase or decrease, for example, the CO2 emissions amount and the renewable energy power amount included in the stored power amount of the power storage facility 214.

[0118] Modification Example of Embodiment 3 A modification of Embodiment 3 will be described in detail with reference to FIG. 14. FIG. 14 is a block diagram showing the performance monitoring function of the power transmission and distribution planning device 100. The power transmission and distribution planning device 100 of this modification has a performance monitoring function of controlling the power storage facility 214 based on various performance values acquired from the terminal 111, in addition to the configuration of formulating the transmission and reception power plan value and the discharge plan value of Embodiment 3 and controlling the output of the power storage facility 214. Here, in FIG. 14, components denoted by the same reference numerals as those shown in FIG. 12 indicate the same or corresponding parts. Further, although FIG. 14 shows only the configuration related to the performance monitoring function, it may further include the demand prediction unit 11, the supply and demand planning unit 12, the power cost calculation unit 15, and the power storage facility management unit 22 shown in FIG. 12.

[0119] When a difference occurs in at least any one of the demand prediction value and the demand actual value, the transmission and reception power plan value and the transmission and reception power actual value, and the power purchase plan value and the power purchase actual value, the power storage facility control unit 23 controls the output of the power storage facility 214 so as to eliminate the difference. Specifically, the power storage facility control unit 23 calculates, in the same manner as in the modification of Embodiment 2, the demand increase amount, which is the difference between the demand actual value and the demand prediction value, the transmission increase amount, which is the difference between the transmission and reception power actual value and the transmission and reception power plan value, and the power purchase increase amount, which is the difference between the power purchase actual value and the power purchase plan value. Further, the power storage facility control unit 23 calculates the required discharge amount of the power storage facility 214 as shown in Equation (19), and controls the output of the power storage facility 214 within the range allowed by the power storage amount so as to satisfy the required discharge amount. Here, when there are a plurality of power storage facilities 214, for example, further control may be performed so as to share the output power based on the facility capacity of the power storage facilities 214. Required discharge amount = Demand increase amount - (Transmission increase amount + Power purchase increase amount) …(19)

[0120] The decarbonization index calculation unit 13 recalculates the CO2 emission amount and the renewable energy power amount for the transmission and reception power actual value, the power purchase actual value, and the discharge amount actual value (hereinafter referred to as the discharge actual value) output by the terminal 111, and outputs them to the certificate cost calculation unit 14. These calculation methods are the same as those in Embodiment 3.

[0121] The certificate cost calculation unit 14 recalculates the required certificate quantity and certificate cost necessary for achieving the respective preset target values for at least either the CO2 emissions amount or the renewable energy power amount recalculated by the decarbonization index calculation unit 13, and outputs the results to the certificate procurement unit 31 and the notification unit 32. These calculation methods are the same as those in Embodiment 3.

[0122] The certificate procurement unit 31 procures environmental certificates corresponding to the required certificate quantity recalculated by the certificate cost calculation unit 14. The procurement method is the same as that in Embodiments 1 to 3. The notification unit 32 performs a notification operation when at least either the required certificate quantity or the certificate cost recalculated by the certificate cost calculation unit 14 exceeds the respective preset threshold values. The detailed notification operation is the same as that in Embodiments 1 to 3.

[0123] Similarly, the power transmission planning device 100 configured in this way can create a transmission plan and a power discharge plan that minimize the total cost including the certificate cost in addition to the transmission fee, electricity fee, and power generation cost while achieving the target values related to the CO2 emissions amount, the power amount derived from renewable energy, or both. Furthermore, the terminal 111 outputs the transmission and reception actual values and the power purchase actual values, and the power storage facility control unit 23 controls the output of the power storage facility 214 so as to eliminate the differences between the predicted demand value, the planned transmission and reception power amount, and the planned power purchase amount and their respective actual values. Therefore, even if there are fluctuations in any of the actual values, the power storage facility 214 can compensate for the fluctuations within the range allowed by the stored power amount. Also, the decarbonization index calculation unit 13 recalculates the CO2 emissions amount and the renewable energy power amount for various actual values, and the certificate cost calculation unit 14 calculates the required certificate quantity and the certificate cost based on the recalculated CO2 emissions amount and renewable energy power amount. Therefore, the actual value of the certificate cost can be presented.

[0124] In this modified example, the decarbonization index calculation unit 13 calculates the CO2 emission amount and the renewable energy power amount corresponding to the discharge actual value in the same manner as in Embodiment 3, that is, by the formula (18). However, the present invention is not limited to this example, and the CO2 emission amount and the renewable energy power amount included in the power storage amount before discharge may be set as the upper limit, and any value may be determined. Specifically, the power transmission plan device 100 further includes a power storage facility management unit 22. The decarbonization index calculation unit 13 acquires the CO2 emission amount and the renewable energy power amount included in the power storage amount from the power storage facility management unit 22, and arbitrarily determines the CO2 emission amount and the renewable energy power amount corresponding to the discharge actual value with the CO2 emission amount and the renewable energy power amount as the upper limit. Thereby, for example, when the demand actual value increases with respect to the demand prediction value, by discharging the renewable energy power amount among the power storage amounts of the power storage facility 214, an increase in the required amount of certificates can be suppressed. Further, for example, when there is a margin for achieving the CO2 emission target value, by increasing the CO2 emission amount corresponding to the discharge actual value, the CO2 emission amount included in the power storage amount of the power storage facility 214 can be reduced.

[0125] In addition, in Embodiments 1 to 3, as one of the constraint conditions for the supply-demand planning unit 12 to minimize the total cost, it was mentioned that the amount of power to be consigned does not exceed the total value of the equipment capacities of the power generation facilities 212. However, this is not limited to this example, and instead of the equipment capacity, a predicted value of the power generation amount of the power generation facilities 212 at the second base 321 serving as the consignment source (hereinafter referred to as the equipment power generation predicted value) may be used. In this case, the power consignment planning device 100 newly includes a power generation prediction unit (not shown) that calculates the equipment power generation predicted value. Specifically, regarding the equipment power generation predicted value of the power generation facilities 212 at the second base 321, for example, if it is PV, a prediction function using the solar radiation amount as a parameter, or if it is wind power generation, a prediction function using the wind volume as a parameter is set in advance. Using this function and the time-series solar radiation amount or wind volume information acquired from, for example, a weather information server, the equipment power generation predicted value at the time when actual supply and demand is performed is calculated. Further, the power generation prediction unit compares the equipment power generation predicted value at a past time calculated from this function with the equipment power generation actual value, and corrects the difference. This correction process is the same as the process performed by the demand prediction unit 11 on the demand predicted value. Here, the method for calculating the predicted value is not limited to this example, and for example, time may be included as a parameter of the prediction function. Thereby, a suitable consignment plan can be formulated when the power generation facilities 212 at the second base 321 serving as the consignment source have difficulty in adjusting the output, such as PV or wind power generation, and may not be able to exhibit the output according to the equipment capacity.

[0126] In addition, in Embodiments 1 to 3, the first base 311 has been shown as having only the demand facility 211, or having a self-base power generation facility 213 or a power storage facility 214 with adjustable output in addition to the demand facility 211. However, the present invention is not limited to this example. For example, it may further have a renewable energy power generation facility (not shown, hereinafter referred to as a renewable energy power generation facility) that is difficult to adjust output, such as PV or wind power transmission. In this case, the terminal 111 installed at the first base 311 outputs the facility power generation actual value of the renewable energy power generation facility in addition to the facility demand actual value. The power consignment plan device 100 includes the above-described power generation prediction unit. The power generation prediction unit calculates the facility power generation predicted value of the renewable energy power generation facility using the facility power generation actual value acquired from the terminal 111, and sums up the values for the number of renewable energy power generation facilities to calculate the predicted power generation amount (hereinafter referred to as the renewable energy power generation predicted value) by the renewable energy power generation facilities at the first base 311. Further, when the certificate cost calculation unit 14 calculates the required certificate amount for achieving the renewable energy power target value, the required certificate amount (power purchase) may be calculated as shown in Equation (7b) instead of Equation (7). Required certificate amount (power purchase) = Renewable energy power amount - Renewable energy power target value - Renewable energy power generation predicted value…(7b) In addition, in Embodiment 1, the supply-demand planning unit 12 may formulate a power consignment reception plan value such that the sum of the consignment reception power amount, the power purchase amount, and the renewable energy power generation predicted value satisfies the demand predicted value of the first base 311, while the total cost including the certificate cost, the consignment fee, the electricity fee, and the power generation cost of the second base 321 is minimized. In addition, in Embodiment 2, the supply-demand planning unit 12 may formulate a power consignment reception plan value and a self-base power generation plan value such that the sum of the consignment reception power amount, the power purchase amount, the self-base power generation amount, and the renewable energy power generation predicted value satisfies the demand predicted value, while the total cost including the certificate cost, the consignment fee, the electricity fee, the power generation cost of the second base 321, and the self-base power generation cost is minimized. In addition, in Embodiment 3, the supply-demand planning unit 12 may formulate a power consignment reception plan value and a discharge plan value such that the sum of the consignment reception power amount, the power purchase amount, the discharge amount of the power storage facility 214, and the renewable energy power generation predicted value satisfies the demand predicted value, while the total cost including the certificate cost, the consignment fee, the electricity fee, and the power generation cost of the second base 321 is minimized. Thus, even when the first base 311 has a renewable energy power generation facility, it is possible to create a transmission plan that minimizes the total cost including the certificate cost in addition to the transmission fee, electricity fee, and power generation cost while achieving the target values regarding the CO2 emission amount, the amount of power derived from renewable energy, or both of them.

[0127] Also, in the modification of Embodiment 2, although an example is shown in which the power generation facility control unit 21 controls the output of the on-site power generation facility 213 so as to eliminate the difference when a difference occurs in at least any one of between the demand prediction value and the demand actual value, between the transmission and reception plan value and the transmission and reception actual value, and between the power purchase plan value and the power purchase actual value, the present invention is not limited to this example. When the first base 311 has a renewable energy power generation facility, when a difference occurs between the renewable energy power generation prediction value and the actual value of the power generation amount by the renewable energy power generation facility of the first base 311 (hereinafter referred to as the renewable energy power generation actual value), the output of the on-site power generation facility 213 may be controlled so as to eliminate the difference. In this case, the power transmission planning device 100 includes the above-described power generation prediction unit, and the power generation prediction unit calculates a renewable energy power generation prediction value using the facility power generation actual value acquired from the terminal 111 and stores it in the storage device 132. Further, the power generation facility control unit 21 sums up the facility power generation actual values acquired from the terminal 111 for the number of renewable energy power generation facilities to calculate the renewable energy power generation actual value, and subtracts the renewable energy power generation prediction value stored in the storage device 132 from the renewable energy power generation actual value to calculate a difference (hereinafter referred to as the power generation increase amount). Furthermore, the power generation facility control unit 21 calculates the required power generation amount of the on-site power generation facility 213 as shown in Expression (17a), and controls the output of the on-site power generation facility 213 so as to satisfy the required power generation amount. Required power generation amount = Demand increase amount - (Transmission increase amount + Power purchase increase amount + Power generation increase amount) …(17a)

[0128] Similarly, in the modification of Embodiment 3, when the first base 311 has a renewable energy power generation facility, the energy storage facility control unit 23 may control the output of the energy storage facility 214 so as to eliminate the difference when a difference occurs between the predicted renewable energy power generation value and the actual renewable energy power generation value. In this case, the power transmission and reception planning device 100 includes the above-described power generation prediction unit, and the power generation prediction unit calculates a predicted renewable energy power generation value using the actual power generation value of the facility acquired from the terminal 111 and stores it in the storage device 132. Further, the energy storage facility control unit 23 totals the actual power generation values of the facilities acquired from the terminal 111 for the number of renewable energy power generation facilities to calculate the actual renewable energy power generation value, subtracts the predicted renewable energy power generation value stored in the storage device 132 from the actual renewable energy power generation value to calculate the power generation increase amount. Further, the energy storage facility control unit 23 calculates the required discharge amount of the energy storage facility 214 as shown in Equation (19a), and controls the output of the energy storage facility 214 within the range allowed by the stored energy amount so as to satisfy the required discharge amount. Required discharge amount = Increased demand - (Increased transmission + Increased power purchase + Increased power generation) …(19a) Thereby, even when the first base 311 has a renewable energy power generation facility, it is possible to compensate for fluctuations in the power generation amount by the renewable energy power generation facility within the range allowed by the facility capacity of the on-site power generation facility 213 or the stored energy amount of the energy storage facility 214.

[0129] Further, in Embodiments 1 to 3, the supply and demand planning unit 12 has shown an example of formulating the power transmission and reception plan value so that the total cost including at least the certificate cost, the transmission fee, the electricity fee related to power purchase, and the power generation cost of the second base 321 is minimized. However, the present invention is not limited to this example. For example, the power transmission and reception plan value may be formulated so as to minimize the total cost further including the cost corresponding to the usage fee of the tie line, that is, the JEPX transaction fee calculated by the power cost calculation unit 15. Here, in Embodiment 3, the discharge plan value of the energy storage facility 214 may be formulated so as to minimize the total cost, and in Embodiment 2, the on-site power generation plan value of the on-site power generation facility 213 may be formulated so as to minimize the total cost further including the on-site power generation cost. Thereby, even when self-transmission is performed via a tie line to the supply areas of different general power transmission and distribution operators, it is possible to formulate a power transmission and reception plan value, a discharge plan value, or an on-site power generation plan value such that the total cost including the cost corresponding to the usage fee is minimized.

[0130] Also, in Embodiments 1 to 3, although the second base 321 has been shown as an example having only the power generation facility 212, it is not limited to this example and may have the demand facility 211. In this case, the power generation facility control unit 21 may determine the required power generation amount of the power generation facility 212 in consideration of the demand prediction value of the second base 321. Specifically, the power generation facility control unit 21 reads out from the storage device 132 the demand prediction value of the second base 321 calculated by the demand prediction unit 11 and the entrusted power transmission and reception planned value formulated by the supply and demand planning unit 12, and sets the sum of these as the required power generation amount of the power generation facility 212. Further, when having the demand facility 211, since the second base 321 can be regarded as the first base 311 having the self-base power generation facility 213 while being the second base, a entrusted power transmission and reception planned value that minimizes the total cost may be formulated. In this case, since the total cost can be expressed by Equation (13), the entrusted power transmission and reception planned value is formulated in the same manner as in Embodiment 2. Thereby, for all bases having the demand facility 211, a entrusted power transmission and reception planned value that minimizes the total cost can be formulated.

[0131] Also, in Embodiments 1 to 3, although the decarbonization index calculation unit 13 has been shown as an example of using the renewable energy ratio pre-stored in the storage device 132 or calculating the renewable energy ratio by Equation (6) in the calculation of the renewable energy amount (entrusted), it is not limited to this example. When the second base 321 has the demand facility 211 in addition to the power generation facility 212, for example, an arbitrary renewable energy ratio may be adopted under the upper limit value shown in Equation (20). Here, the formula transformation from the first line to the second line of formula (20) uses the relationship shown in formula (21). Further, formula (20) shows an example where all of the power consumption of the demand facility 211 at the second base 321 is the power generated from non-renewable energy (hereinafter referred to as non-renewable power) among the power generation amounts at the second base 321. It is assumed that the non-renewable power is maximally utilized within the base and the amount of renewable energy power to be consigned to the first base 311 is maximally increased. That is, when the second base 321 has the demand facility 211, it corresponds to the fact that the amount of renewable energy power to be consigned to the first base 311 can be arbitrarily determined within the upper limit value. Thereby, for example, when it is desired to reduce the certificate required amount of the first base 311, a consignment plan can be formulated to preferentially consign the amount of renewable energy power to the first base 311.

[0132] [Number]

[0133] Similarly, in Embodiment 3, the second base 321 may further have a power storage facility 214, for example, to smooth the output fluctuations when it is difficult to adjust the output of the power generation facility 212. The power storage facility management unit 22 may calculate the amount of renewable energy power included in the stored power not only for the power storage facility 214 of the first base 311 but also for the power storage facility 214 of the second base 321. The power storage facility control unit 23 may control the charge and discharge of not only the power storage facility 214 of the first base 311 but also the power storage facility 214 of the second base 321. In this case, the decarbonization index calculation unit 13 may adopt an arbitrary renewable energy ratio under the upper limit values shown in, for example, formula (22) or formula (23) in the calculation of the amount of renewable energy power (consignment). Here, Equation (22) shows an example where the charging amount of the power storage facility 214 at the second base 321 is entirely covered by non-renewable energy power. It is assumed that by charging, the non-renewable energy power is maximally utilized within the base, and the amount of renewable energy power to be sent to the first base 311 is maximally increased. Also, Equation (23) shows an example where the discharging amount of the power storage facility 214 at the second base 321 is entirely renewable energy power. It is assumed that by discharging, the amount of renewable energy power to be sent to the first base 311 is maximally increased. That is, when the second base 321 has the power storage facility 214, it corresponds to the fact that the amount of renewable energy power to be sent to the first base 311 can be arbitrarily determined within the range allowed by the stored power amount. Thereby, a transmission plan can be formulated to preferentially send the renewable energy power to the first base 311.

[0134]

Number

[0135] Also, in Embodiment 3, the power storage facility management unit 22 calculates the amount of renewable energy power corresponding to the charging amount by Equation (5) each time charging is performed, and stores the amount of renewable energy power included in the stored power amount as the charge / discharge history. However, it is not limited to this example, and the amount of renewable energy power corresponding to the past charging amount may be changed, and the amount of renewable energy power included in the past stored power amount stored as the charge / discharge history may be rewritten. For example, when the second base 321 has the demand facility 211 in addition to the power generation facility 212, the power storage facility management unit 22 may arbitrarily change the renewable energy ratio in Equation (5) based on the upper limit value shown in Equation (20) for charging with respect to the past entrusted power reception amount stored as the charge-discharge history, and recalculate the renewable energy amount corresponding to the charge amount. Further, the power storage facility management unit 22 adds the renewable energy amount corresponding to the recalculated charge amount to the renewable energy amount included in the power storage amount before charging. The power storage facility management unit 22 rewrites the renewable energy amount included in the power storage amount after charging thus recalculated as the charge-discharge history. Here, as another example, when the second base 321 has the power storage facility 214 in addition to the power generation facility 212, the power storage facility management unit 22 may arbitrarily change the renewable energy ratio in Equation (5) based on the upper limit value shown in, for example, Equation (22) or Equation (23) and recalculate the renewable energy amount corresponding to the charge amount. Thereby, in preparation for a frame at a future time when it is expected that the supply amount of the renewable energy amount will decrease due to reasons such as bad weather, the renewable energy amount included in the power storage amount can be increased.

[0136] Also, in Embodiments 1 to 3, the supply-demand planning unit 12 has shown an example of formulating the entrusted power reception / supply plan value so that the total cost for a certain frame is minimized. However, the present invention is not limited to this example. For example, the entrusted power reception / supply plan value may be formulated so that the total cost for a week is minimized. In this case, for example, in Embodiment 1, a loop related to frames is added outside steps S00 to S07 in FIG. 4, the total cost for each frame is calculated and integrated, and in step S08, the minimum value may be selected from the integrated total cost for the week. Thereby, even when the total cost fluctuates greatly depending on the time and the optimal stacking in each frame does not become optimal for a week, for example, the entrusted power reception / supply plan value can be formulated so that the total cost for that period is minimized.

[0137] In Embodiments 1 to 3, the preset target values of CO2 emissions and renewable energy power generation are shown as values for each time slot, but are not limited to this example. For example, they may be set as monthly values. In this case, the certificate cost calculation unit 14 distributes the monthly target value to set the target value for each time slot. Here, the target value for each time slot may be evenly distributed for each time slot from the monthly target value. For example, coefficients may be set for each time slot using an input device to change the distribution for each time slot. Thereby, even when the monthly target value is set by an operator or a government ordinance, the power transmission and reception plan value can be formulated so as to achieve this and minimize the total cost.

[0138] In Embodiments 1 to 3, the minimum total cost means the minimum among the total costs corresponding to the patterns of power transmission and reception amounts in a plurality of power transmission and reception plan value candidates considered by the supply and demand planning unit 12. Specifically, for example, in step S01 in FIG. 4 (Embodiment 1), step S31 in FIG. 8 (Embodiment 2), and step S41 in FIG. 13 (Embodiment 3). For example, when the combinations of power transmission and reception amounts are enormous, in order to shorten the processing time, it is conceivable to narrow down some of the candidates considered by the supply and demand planning unit 12 and evaluate the total cost. In that case, even if there is a combination with a lower total cost that was not considered, if the one with the minimum total cost among the considered candidates is selected, the effect of being able to reduce the cost compared to the case of not selecting it can be obtained.

[0139] In Embodiments 1 to 3, an example is shown in which the power transmission and reception amount is varied in various ways and the power transmission and reception amount that minimizes the total cost is numerically solved. However, it is not limited to this example. The power transmission and reception amount that minimizes the total cost, the combination of the power transmission and reception amount and the self-generation amount at the base point, or the combination of the power transmission and reception amount and the discharge amount may be analytically solved. The processing in this case will be described with reference to FIG. 15 using the case where the first base point 311 has only the demand facility 211 (Embodiment 1) as an example. FIG. 15 is a flowchart showing the processing for analytically deriving the power transmission and reception amount that minimizes the total cost in Embodiment 1. The demand-supply planning unit 12 analytically solves for the power transmission and reception amount that minimizes the total cost, determines it as the power transmission and reception planned value, and outputs it to the decarbonization index calculation unit 13 (step S51). Further, the demand-supply planning unit 12 calculates the power purchase amount in the same manner as step S02 in FIG. 4, determines it as the power purchase planned value, and outputs it to the decarbonization index calculation unit 13 (step S52). The decarbonization index calculation unit 13 calculates the CO2 emission amount and the renewable energy power amount in the same manner as step 03 in FIG. 4 for the determined power transmission and reception planned value and power purchase planned value, and outputs them to the certificate cost calculation unit 14 (step S53). The certificate cost calculation unit 14 calculates the required certificate amount and the certificate cost necessary to achieve the preset target value for at least one of the calculated CO2 emission amount and renewable energy power amount in the same manner as step S04 in FIG. 4, and outputs them to the demand-supply planning unit 12 (step S54). The power cost calculation unit 15 calculates the transmission fee, the electricity fee, and the power generation cost of the second base 321 using the determined power transmission and reception planned value and power purchase planned value in the same manner as step S05 in FIG. 4, and outputs them to the demand-supply planning unit 12 (step S55). Thus, when it is possible to analytically solve for the power transmission and reception amount that minimizes the total cost, the number of processing steps can be reduced and the processing time can be reduced compared to the case of numerically solving.

[0140] In addition, although multiple embodiments have been described, other than the above disclosure, as long as the features described in each embodiment do not conflict, free combinations of each embodiment, modifications of any component of each embodiment, or omissions of each embodiment are possible. For example, as a combination of Embodiments 2 and 3, the first base 311 may have, in addition to the demand facility 211, a self-base power generation facility 213 and a power storage facility 214. In this case, the power transmission plan device 100 may be such that the power generation facility control unit 21 controls the power generation output of the self-base power generation facility 213, and the power storage facility control unit 23 controls the discharge output of the power storage facility 214. Further, the first base 311 may further have a renewable energy power generation facility. In this case, the power transmission plan device 100 may control the power generation output of the self-base power generation facility 213 and the discharge output of the power storage facility 214 in consideration of the power generation amount of the renewable energy power generation facility. Thereby, even when the first base 311 is equipped with all of the demand facility, the power generation facility, and the power storage facility, it is possible to create a transmission plan that minimizes the total cost including the certificate cost in addition to the transmission fee, the electricity fee, and the power generation cost while achieving the target value regarding the CO2 emission amount, the amount of electricity derived from renewable energy, or both.

Explanation of Signs

[0141] 11 Demand prediction unit, 12 Supply and demand planning unit, 13 Decarbonization index calculation unit, 14 Certificate cost calculation unit, 15 Power cost calculation unit, 21 Power generation facility control unit, 22 Power storage facility management unit, 23 Power storage facility control unit, 31 Certificate procurement unit, 32 Notification unit, 100 Power transmission plan device, 111 Terminal, 211 Demand facility, 212 Power generation facility, 213 Self-base power generation facility, 214 Power storage facility, 311 First base, 321 Second base

Claims

1. When a first base having required equipment receives a consignment from a second base having a power generation facility, a consignment fee generated according to the consignment power reception amount, an electricity fee generated according to the power purchase amount from a retail electricity supplier with respect to the first base, and a power cost calculation unit that calculates a power generation cost generated according to the power generation amount of the power generation facility of the second base; A decarbonization index calculation unit that calculates the amount of CO2 emissions and the amount of electricity from renewable energy with respect to the consignment power reception amount and the power purchase amount from the second base; A certificate cost calculation unit that calculates a certificate cost representing the procurement amount and procurement cost of environmental certificates required to achieve a preset target value with respect to at least one of the CO2 emissions and the amount of electricity from renewable energy; A supply and demand planning unit that formulates a planned value of the consignment power reception amount so that the total cost including the consignment fee, the electricity fee, and the certificate cost of the first base and the power generation cost of the second base is minimized while the sum of the consignment power reception amount and the power purchase amount satisfies the predicted value of the power demand of the first base; A power consignment planning device comprising:

2. When the first base further has a renewable energy power generation facility, The supply and demand planning unit formulates a planned value of the consignment power reception amount so that the total cost is minimized while the sum of the predicted values of the consignment power reception amount, the power purchase amount, and the power generation amount of the renewable energy power generation facility satisfies the predicted value of the demand. The power consignment planning device according to claim 1.

3. When the first base further has a self-base power generation facility with adjustable output, The power cost calculation unit calculates a self-base power generation cost generated according to the self-base power generation amount representing the power generation amount of the self-base power generation facility, The decarbonization index calculation unit further includes the self-base power generation amount as a target and calculates the amount of CO2 emissions and the amount of electricity from renewable energy, The supply and demand planning unit formulates a planned value of the self-base power generation amount so that the total cost further including the self-base power generation cost is minimized while the sum of the consignment power reception amount, the power purchase amount, and the self-base power generation amount satisfies the predicted value of the demand. The power consignment planning device according to claim 1.

4. When the first base further has a renewable energy power generation facility, The power transmission plan unit according to claim 3 is characterized in that, while the total of the predicted values of the entrusted power reception / supply amount, the power purchase amount, the on-site power generation amount, and the power generation amount of the renewable energy power generation facility satisfies the predicted value of the demand amount, the planned value of the on-site power generation amount is determined so that the total cost is minimized.

5. Regarding the first site further having a power storage facility, when the power storage facility performs charging and discharging, a power storage facility management unit that calculates the CO2 emission amount and the amount of power derived from renewable energy corresponding to the charging amount and the discharging amount of the power storage facility, and the CO2 emission amount and the amount of power derived from renewable energy included in the stored power amount after charging and discharging, and stores them as a charging / discharging history is provided. The power transmission plan device according to claim 1.

6. The power storage facility management unit according to claim 5 is characterized in that, regarding past discharges stored as the charging / discharging history, the CO2 emission amount and the amount of power derived from renewable energy corresponding to the discharge amount are changed, and the CO2 emission amount and the amount of power derived from renewable energy included in the past stored power amount are rewritten. The power transmission plan device according to claim 5.

7. The power storage facility management unit according to claim 5 is characterized in that, regarding past charges stored as the charging / discharging history, the CO2 emission amount and the amount of power derived from renewable energy corresponding to the charging amount are changed, and the CO2 emission amount and the amount of power derived from renewable energy included in the past stored power amount are rewritten. The power transmission plan device according to claim 5.

8. The decarbonization index calculation unit calculates the CO2 emission amount and the amount of power derived from renewable energy, further including the discharge amount as a target, The power supply / demand plan unit according to claim 5 is characterized in that, while the total of the entrusted power reception / supply amount, the power purchase amount, and the discharge amount satisfies the predicted value of the demand amount, the planned value of the discharge amount is determined so that the total cost is minimized.

9. When the first site further has a renewable energy power generation facility, The power supply / demand plan unit according to claim 8 is characterized in that, while the total of the predicted values of the entrusted power reception / supply amount, the power purchase amount, the discharge amount, and the power generation amount of the renewable energy power generation facility satisfies the predicted value of the demand amount, the planned value of the discharge amount is determined so that the total cost is minimized.

10. When the first site further has an on-site power generation facility with adjustable output, The power cost calculation unit calculates the on-site power generation cost generated according to the on-site power generation amount representing the power generation amount of the on-site power generation facility. The decarbonization index calculation unit further calculates the CO2 emission amount and the amount of power derived from renewable energy, including the on-site power generation amount and the discharge amount. The power supply and demand planning unit determines the planned value of the on-site power generation amount and the planned value of the discharge amount such that the total cost including the on-site power generation cost is minimized while the total of the power transmission and reception amount, the purchased power amount, the on-site power generation amount, and the discharge amount satisfies the predicted value of the demand. The power transmission planning device according to claim 5.

11. When the first site further has a renewable energy power generation facility, The power supply and demand planning unit determines the planned value of the on-site power generation amount and the planned value of the discharge amount such that the total cost is minimized while the total of the power transmission and reception amount, the purchased power amount, the on-site power generation amount, the discharge amount, and the predicted value of the power generation amount of the renewable energy power generation facility satisfies the predicted value of the demand. The power transmission planning device according to claim 10.

12. The power transmission planning device according to any one of claims 1, 2, 5, 6, 7, 8, and 9, further comprising a power generation facility control unit that controls the output of the power generation facility at the second site based on the planned value of the power transmission and reception amount.

13. Comprising a power generation facility control unit that controls the output of the power generation facility at the second site based on the planned value of the power transmission and reception amount. The power generation facility control unit further controls the output of the on-site power generation facility based on the planned value of the on-site power generation amount. The power transmission planning device according to any one of claims 3, 4, 10, and 11.

14. When a difference occurs between at least any one of the predicted value of the demand, the planned value of the power transmission and reception amount, and the planned value of the purchased power amount and the actual value, it includes a power generation facility control unit that controls the output of the on-site power generation facility to eliminate the difference. The decarbonization index calculation unit recalculates the CO2 emission amount and the amount of power derived from renewable energy for the actual values of the power transmission and reception amount, the purchased power amount, and the on-site power generation amount. The certificate cost calculation unit calculates the procurement quantity and the certificate cost of the environmental certificate required for achieving the preset target value with respect to at least one of the CO2 emission amount and the amount of power derived from renewable energy. The power transmission and distribution planning device according to claim 3 or 10, characterized in that.

15. When a difference occurs between at least one of the predicted value of the demand, the planned value of the power transmission and reception amount, the planned value of the power purchase amount, and the predicted value of the power generation amount of the renewable energy power generation facility and the respective actual values, a power generation facility control unit is provided that controls the output of the self-owned power generation facility so as to eliminate the difference. The decarbonization index calculation unit recalculates the CO2 emission amount and the amount of power derived from renewable energy for the actual values of the power transmission and reception amount, the power purchase amount, and the self-owned power generation amount. The certificate cost calculation unit calculates the procurement quantity and the certificate cost of the environmental certificate required for achieving the preset target value with respect to at least one of the CO2 emission amount and the amount of power derived from renewable energy. The power transmission and distribution planning device according to claim 4 or 11, characterized in that.

16. The power transmission and distribution planning device according to any one of claims 8, 9, 10, and 11, comprising a power storage device control unit that controls the charging and discharging of the power storage device based on the planned value of the discharge amount.

17. When a difference occurs between at least one of the predicted value of the demand, the planned value of the power transmission and reception amount, and the planned value of the power purchase amount and the respective actual values, a power storage device control unit is provided that controls the charging and discharging of the power storage device so as to eliminate the difference. When the power storage device discharges, The decarbonization index calculation unit recalculates the CO2 emission amount and the amount of power derived from renewable energy for the actual values of the power transmission and reception amount, the power purchase amount, and the discharge amount. The certificate cost calculation unit calculates the procurement quantity and the certificate cost of the environmental certificate required for achieving the preset target value with respect to at least one of the CO2 emission amount and the amount of power derived from renewable energy. The power transmission and distribution planning device according to claim 8 or 10, characterized in that.

18. When a difference occurs between at least any one of the predicted value of the required amount, the planned value of the transmitted and received power amount, the planned value of the power purchase amount, and the predicted value of the power generation amount of the renewable energy power generation facility, and the respective actual values, a power storage facility control unit is provided to control the charge and discharge of the power storage facility so as to eliminate the difference. When the power storage facility discharges, The decarbonization index calculation unit recalculates the CO2 emission amount and the amount of power derived from renewable energy with respect to the actual values of the transmitted and received power amount, the power purchase amount, and the discharge amount. The certificate cost calculation unit calculates the procurement amount and the certificate cost of the environmental certificate required for achieving the preset target value with respect to at least any one of the CO2 emission amount and the amount of power derived from renewable energy. The power transmission planning device according to claim 9 or 11.

19. The power transmission planning device according to claim 1, further comprising a certificate procurement unit that procures the procurement amount by at least any one of purchase from an environmental certificate issuing operator and transaction at an environmental certificate exchange.

20. The power transmission planning device according to claim 1, further comprising a notification unit that performs a notification operation when at least any one of the procurement amount and the certificate cost exceeds the preset respective threshold values.

21. A step of calculating a transmission fee generated according to the transmitted and received power amount when a first site having a demand facility receives transmission from a second site having a power generation facility, an electricity fee generated according to the power purchase amount from a retail electricity business operator for the first site, and a power generation cost generated according to the power generation amount of the power generation facility of the second site; A step of calculating the CO2 emission amount and the amount of power derived from renewable energy for the transmitted and received power amount and the power purchase amount from the second site; A step of calculating a procurement amount of an environmental certificate required for achieving a preset target value and a certificate cost representing the procurement cost with respect to at least any one of the CO2 emission amount and the amount of power derived from renewable energy; A step of formulating a planned value of the transmitted and received power amount so that the total cost including the transmission fee, the electricity fee, and the certificate cost of the first site and the power generation cost of the second site is minimized while the sum of the transmitted and received power amount and the power purchase amount satisfies the predicted value of the power demand of the first site; A power transmission planning method comprising:

22. When a first site having required equipment receives a power transmission from a second site having a power generation facility, a process of calculating a transmission fee generated according to the received power transmission amount, an electricity fee generated according to the electricity purchase amount from a retail electricity provider with respect to the first site, and a power generation cost generated according to the power generation amount of the power generation facility of the second site; A process of calculating the amount of CO2 emissions and the amount of electricity from renewable energy with respect to the received power transmission amount and the electricity purchase amount from the second site; A process of calculating a certificate cost representing the procurement amount and procurement cost of environmental certificates required to achieve a preset target value with respect to at least one of the amount of CO2 emissions and the amount of electricity from renewable energy; A process of formulating a planned value of the received power transmission amount so that the total cost including the transmission fee, the electricity fee, and the certificate cost of the first site and the power generation cost of the second site is minimized while the sum of the received power transmission amount and the electricity purchase amount satisfies the predicted value of the power demand of the first site; A power transmission plan program for causing a computer to execute the above.

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