Power control system and power control method

Abstract

To provide a power control system and a power control method, which can appropriately take in account various costs.SOLUTION: A power control system includes: a power generation facility for generating power; a power charge / discharge facility for charging and discharging power; a power consumption facility for consuming power; and a control device for controlling a part or all of generated power of the power generation facility, charge / discharge power of the power charge / discharge facility and power consumption of the power consumption facility. The control device controls a part or all of power in a planning period based on a first value which is the value obtained by dividing a first cost which is the cost over the entire life cycle of the power generation facility by a total generated power amount during an operation period of the power generation facility, a second value which is the value obtained by dividing a second cost which is the cost over the entire life cycle of the power charge / discharge facility by a total discharged power amount during the operation period of the charge / discharge facility, a prediction value of consumption power in a prescribed planning period, and a prediction value of generated power in the planning period.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a power control system and a power control method. [Background technology]

[0002] Patent Document 1 describes the following power generation control system that aims to suppress increases in maintenance costs caused by control content. That is, the power generation control system described in Patent Document 1 is a power generation control system that controls multiple power generation facilities, and includes a calculation unit that calculates the maintenance costs of the multiple power generation facilities that vary according to the control content for the power output values ​​of each of the multiple power generation facilities, and a control unit that controls the power output values ​​of each of the multiple power generation facilities based on the calculated maintenance costs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-141509 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the power generation control system described in Patent Document 1 aims to suppress increases in maintenance costs, and has a problem in that it may not be possible to appropriately consider costs other than maintenance costs.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a power control system and a power control method that can appropriately take various costs into consideration. [Means for solving the problem]

[0006] In order to solve the above problems, the power control system of the present disclosure includes a power generation equipment that generates power, a charging / discharging equipment that charges and discharges power, a power consumption equipment that consumes power, and a control device that controls some or all of the generated power of the power generation equipment, the charging / discharging power of the charging / discharging equipment, and the power consumption of the power consumption equipment, and the control device controls some or all of the above during a planning period based on a first value that is a value obtained by dividing a first cost, which is a cost over the entire life cycle of the power generation equipment, by a total amount of power generated during an operating period of the power generation equipment, a second value that is a value obtained by dividing a second cost, which is a cost over the entire life cycle of the charging / discharging equipment, by a total amount of power discharged during an operating period of the charging / discharging equipment, a predicted value of the power consumption during a specified planning period, and a predicted value of the generated power during the planning period.

[0007] A power control method according to the present disclosure includes using a power generation equipment that generates power, a charging / discharging equipment that charges / discharges power, a power consumption equipment that consumes power, and a control device that controls some or all of the generated power of the power generation equipment, the charging / discharging power of the charging / discharging equipment, and the power consumption of the power consumption equipment, the control device controlling some or all of the generated power of the power generation equipment during a planning period based on a first value that is a value obtained by dividing a first cost, which is a cost over the entire life cycle of the power generation equipment, by a total amount of power generated during an operating period of the power generation equipment, a second value that is a value obtained by dividing a second cost, which is a cost over the entire life cycle of the charging / discharging equipment, by a total amount of power discharged during the operating period of the charging / discharging equipment, a predicted value of the power consumption during a specified planning period, and a predicted value of the generated power during the planning period. Effect of the Invention

[0008] According to the power control system and power control method of the present disclosure, various costs can be appropriately taken into consideration. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing a configuration example of a power control system according to an embodiment of the present disclosure. [Diagram 2] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Diagram 3] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 4] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Diagram 5] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 6] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 7] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 8] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 9] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 10] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 11] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 12] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 13] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 14] 1 is a schematic diagram for explaining an example of operation of a power control system according to an embodiment of the present disclosure. FIG. [Figure 15] FIG. 1 is a schematic block diagram illustrating a configuration of a computer according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a power control system and a power control method according to an embodiment of the present disclosure will be described with reference to Figs. 1 to 15. Fig. 1 is a block diagram showing a configuration example of a power control system according to an embodiment of the present disclosure. Figs. 2 to 14 are schematic diagrams for explaining an operation example of the power control system according to an embodiment of the present disclosure. Fig. 15 is a schematic block diagram showing the configuration of a computer according to an embodiment of the present disclosure.

[0011] As shown in FIG. 1, a power control system 1 according to an embodiment of the present disclosure includes a power generation facility 2, a charging / discharging facility 3, a power consumption facility 4, and a control device 5.

[0012] The power generation facility 2 is a facility that generates electric power. The electric power generated by the power generation facility 2 is supplied to the charging / discharging facility 3, the electric power consumption facility 4, an electric power system (not shown), and the like. The power generation facility 2 includes one or more power generation devices that convert renewable energy such as solar, hydroelectric, wind, and geothermal energy, and fossil energy such as coal, oil, and natural gas, into electric power and output the converted power. The power generation facility 2 may also include a heat source device that generates thermal energy such as steam, and a device that generates other energy such as kinetic energy and electromagnetic energy, in conjunction with power generation. In this embodiment, the power generation facility 2 includes a photovoltaic power generation (hereinafter also abbreviated as "PV") device having a solar panel and a PCS (Power Conditioning System; power control system). The power generation facility 2 also controls (for example, suppresses) the generated electric power (or the amount of generated electric power) directly or indirectly via another control device based on a predetermined control signal output by the control device 5.

[0013] The charging / discharging equipment 3 is equipment that charges and discharges electric power. The charging / discharging equipment 3 includes one or more power storage equipment 31 and one or more charge / discharge control equipment (not shown) that controls charging / discharging electric power for the power storage equipment 31. The charging / discharging equipment 3 charges the power storage equipment 31 with electric power generated by the power generation equipment 2 or electric power supplied from the power grid, and supplies electric power discharged from the power storage equipment 31 to the power consumption equipment 4 or the power grid. In this embodiment, the charging / discharging equipment 3 includes a battery energy storage system (BESS (Battery Energy Storage System)) including a battery (storage battery or secondary battery) and a PCS. The charging / discharging equipment 3 controls the charging / discharging electric power (or the amount of charging / discharging electric power) directly or indirectly via another control device based on a predetermined control signal output by the control device 5.

[0014] The power consumption equipment 4 is equipment that consumes power. The power consumption equipment 4 consumes, for example, power generated by the power generation equipment 2, power discharged by the charging / discharging equipment 3, and power supplied from a power grid. The power consumption equipment 4 includes, for example, one or more electric devices installed in a facility such as a factory, and some or all of the electric devices can control (increase or decrease) their power consumption (or power consumption amount) directly based on a predetermined control signal output by the control device 5 or indirectly via another control device or the like. However, the power consumption equipment 4 may operate without receiving commands from the power control system 1, for example, when operating production equipment based on a production plan of the factory.

[0015] The control device 5 is configured using, for example, one or more computers and their peripheral devices. The control device 5 controls a part or all of the generated power of the power generation facility 2, a part or all of the charged / discharged power of the charging / discharging facility 3, and a part or all of the power consumed by the power consumption facility 4. However, the control device 5 does not have to control the power consumption of the power consumption facility 4. That is, in the present disclosure, the control device 5 controlling a part or all of the generated power, the charged / discharged power, and the power consumed includes a case where the control device 5 does not control the power consumption. In this embodiment, the control device 5 controls the power generated by the power generation facility 2, the charging and discharging power of the charging and discharging facility 3, and part or all of the power consumption of the power consumption facility 4 during the planning period, based on a first value obtained by dividing a first cost, which is the cost over the entire life cycle of the power generation facility 2, by the total amount of power generated during the operation period of the power generation facility 2, a second value obtained by dividing a second cost, which is the cost over the entire life cycle of the charging and discharging facility 3, by the total amount of power discharged during the operation period of the charging and discharging facility 3, a predicted value of the power consumption of the power consumption facility 4 during a predetermined planning period, and a predicted value of the power generated by the power generation facility 2 during the planning period, as described below. Here, the life cycle corresponds to the period from the birth to the end of the facility, and is, for example, the period from the start of construction of the power generation facility 2 to disposal, or the period from the start of construction of the charging and discharging facility 3 to disposal. The operating period is the period during which the facility is actually operated. The second cost includes a cost when the contracted power is exceeded and a cost required for replacing the power storage equipment 31 of the charging / discharging equipment 3. Examples of cost increase elements associated with the operation of the charging / discharging equipment 3 corresponding to the second cost include an increase in electricity charges from the next month onward when the contracted power is exceeded, and a battery replacement cost when it becomes necessary to replace the battery of the power storage equipment 31 of the charging / discharging equipment 3 during the equipment operation period. The control device 5 controls part or all of the power generation by the power generation equipment 2, the charging / discharging power by the charging / discharging equipment 3, and the power consumption by the power consumption equipment 4 during the planning period so that the difference between the predicted value of the first value and the first value and the difference between the predicted value of the second value and the second value, which are predicted in association with the operation of the planning period, become small.The control device 5 may be configured as, for example, an element of an EMS (Energy Management System).

[0016] In this embodiment, the control device 5 uses the levelized cost of energy (LCOE) as an index for equipment operation (equipment control), and controls each piece of equipment (or sets a control target for each piece of equipment) so that the deviation between the LCOE in actual operation and the target value is as small as possible, with the planned value of LCOE as a target value. In this embodiment, three types of levelized costs are used as the LCOE (levelized cost of energy). The first levelized cost is the LCOE (Levelized Cost of Electricity), which is the value (yen / kWh) obtained by dividing the cost of the entire life cycle of the power generation equipment 2 by the total amount of power generated during the operation period. In this embodiment, this cost is also called PV-LCOE. The notation PV-LCOE corresponds to the fact that the power generation equipment 2 in this embodiment is equipped with a photovoltaic power generation device as an example, and is also an notation for distinguishing between BESS-LCOE and Grid-LCOE, which will be described later. The second levelized cost is LCOS (Levelized Cost Of Storage), which is a value (yen / kWh) obtained by dividing the cost of the entire life cycle of the charging / discharging equipment 3 by the total amount of discharged power during the operation period. In this embodiment, this levelized cost is also called BESS-LCOE. And the third levelized cost is a value (yen / kWh) obtained by dividing the power fee incurred when purchasing power from the grid during the operation period of the power generation equipment 2 or the charging / discharging equipment 3 by the total amount of purchased power. In this embodiment, this levelized cost is also called Grid-LCOE. However, other levelized costs may be used in other embodiments of the present disclosure. In this embodiment, when the three types of levelized costs are collectively referred to, they are simply called LCOE. In addition, the planned value of LCOE is a predicted value of the cost per unit energy that is estimated when the equipment is introduced and that is incurred when generating or charging / discharging energy throughout the entire life cycle by using the equipment. The planned value of LCOE can be an important factor as a criterion for judgment when introducing the equipment, for example. Therefore, it is expected that the actual value (cost per unit energy) will be equal to or less than the planned value (or within a certain range from the planned value).In this embodiment, the control device 5 uses the LCOE to control the operation of the facility by taking into consideration various costs other than the operation cost, such as facility cost, disposal cost, and battery replacement cost of the BESS.

[0017] FIG. 2 shows a basic calculation formula (1) of LCOE used by the control device 5. In formula (1), t is a variable that represents the number of years that have passed since the start of operation, with the year when operation began being set as year 0. Σ is a function that adds the variables in Σ while incrementing t by 1, until the year when the last cost is incurred. The variable Ct represents the cost incurred in year t. The cost includes, for example, construction costs, fixed costs, variable costs, disposal costs, etc. The variable Et represents the input / output energy in year t. Here, the input / output energy is, for example, generated power, discharged power, etc. The variable r is a discount rate for converting the cost into the present value of the year when operation began.

[0018] 3 shows an example of the LCOE (formula (2)) used by the control device 5 for the power generation facility 2 in this embodiment. The LCOE in formula (2) (corresponding to the above-mentioned PV-LCOE) is a value (first value) obtained by dividing a first cost (the numerator on the right side of formula (2)), which is the cost over the entire life cycle of the power generation facility 2, by the total amount of power generated during the operation period of the power generation facility 2 (the denominator on the right side of formula (2)). The LCOE in formula (2) represents the average power generation cost per unit amount of power generated. In addition, in formula (2), LCOE is the levelized cost of electricity [yen / kWh], Capital_t ("_t" represents the subscript t) is the construction cost [yen], O&M_t is the operation and maintenance cost [yen / year], Fuel_t is the fuel cost [yen / year], Carbon_t is the CO2 (carbon dioxide) emission cost [yen / year], D_t is the decommissioning cost [yen], kWh is the annual power generation amount [kWh / year], r is the discount rate [%], and t is the number of years since the equipment started operation [years]. As described above, if the power generation equipment 2 includes equipment that generates other energy, for example, the cost [yen / MJ] of the heat source equipment can be converted at 1Wh=3600J and expressed in yen / kWh, so that electricity and heat can be treated in an integrated manner. In addition, since formula (2) includes the carbon dioxide emission cost in the numerator, it is possible to take into consideration, for example, operation that takes into account the reduction of carbon dioxide emissions.

[0019] FIG. 4 shows an example of LCOS (Equation (3)) used by the control device 5 for the charging / discharging facility 3 in this embodiment. The LCOS in Equation (3) (corresponding to the above-mentioned BESS-LCOE) is a value (second value) obtained by dividing the second cost (numerator on the right side of Equation (3)), which is the cost over the entire life cycle of the charging / discharging facility 3, by the total discharged power amount (denominator on the right side of Equation (3)) during the operation period of the charging / discharging facility 3. The LCOS in Equation (3) represents the average discharge cost per unit of discharged power amount. The LCOS in Equation (3) represents the levelized discharge cost [yen / kWh]. The numerator on the right side of Equation (3) is a new addition of the elements Elec_Penalty_t (increased power purchase cost (penalty) [yen / kWh]) and Batt_t (BESS battery replacement cost [yen / kWh]) to the numerator on the right side of Equation (2). The kWh in the denominator represents the annual discharged power amount [kWh / year].

[0020] In this embodiment, for example, the LCOS of the BESS is calculated by adding the following penalty elements when the EMS cannot operate the BESS appropriately: (1) the power cost increase when the contracted power is exceeded (Elec_Penalty_t), and (2) the power cost increase due to the occurrence of battery replacement (Batt_t). At the start of operation, Elec_Penalty_t and Batt_t are set to zero. If the BESS cannot be operated appropriately and the contracted power is exceeded, the contracted power must be increased thereafter. For example, if the contracted power unit price is 1,815 yen / kW / month and the contracted power increase is 100kW, the increase in purchased power costs will be 181,500 yen / month (2,178,000 yen / year). This is added as Elec_Penalty_t to calculate the LCOS. If a battery replacement becomes necessary during the operation period of the facility based on a separately calculated prediction of the battery life of the BESS, for example, if the battery cost is 40,000 yen / kWh and the battery capacity is 100 kWh, the battery replacement cost will be 4,000,000 yen. This is set as Batt_t and added only to the year t in which the battery replacement occurs to calculate the LCOS. As a result, the LCOS of the BESS will increase if (1) the contracted power is exceeded, or (2) a battery replacement occurs. By using this index to select an operation mode that minimizes LCOS, it becomes possible to select the optimal operation mode that prevents (1) and (2).

[0021] FIG. 5 shows an example of LCOE (formula (4)) used when the control device 5 purchases power from the grid in this embodiment. The LCOE in formula (4) (corresponding to the above-mentioned Grid-LCOE) is a value obtained by dividing the cost over the entire life cycle of the purchased power (the numerator on the right side of formula (4)) by the total amount of power purchased during the operation period (the denominator on the right side of formula (4)). The LCOE in formula (4) represents the average power purchase cost per unit amount of purchased power. The LCOE in formula (4) represents the levelized power purchase cost [yen / kWh]. In formula (4), Contract_Electric_Feet is the contract power charge [yen], Power_Charget is the metered charge [yen / kWh], and kWh is the annual amount of purchased power [kWh / year]. In formula (4), the purchased power from the power company is expressed in the same form as formula (2) by setting construction cost = contract power charge and fuel cost = metered charge. The calculation of LCOS (BESS-LCOE) takes into account the increased costs that occur when the contracted power is exceeded. However, this is only taken into account in the LCOS calculation until the contracted power is exceeded. After the contracted power is actually exceeded, the increased costs of LCOS are reset and the contracted power charge of Grid-LCOE is increased.

[0022] In this embodiment, when introducing the power generation equipment 2 and the charging / discharging equipment 3 into the power control system 1, an LCOE planning curve is created based on, for example, the equipment introduction cost and the amount of power generation expected at the time of introduction. As an example, a case is shown in which a PV and a BESS are installed in a factory and the factory is operated with electricity purchased from an electric power company. In this case, an LCOE planning curve is created for the PV, the BESS, and the purchased electricity.

[0023] Figure 6 shows an example of an LCOE planning curve for PV. In Figure 6, the horizontal axis represents the total amount of power generated over the life cycle, and the vertical axis represents the PV-LCOE, and the relationship between the total amount of power generated and the PV-LCOE is shown as an LCOE planning curve. In addition, the planned value of LCOE can be set on the LCOE planning curve. The planned LCOE value (xx yen / kWh) can be set on the LCOE planning curve based on the planned value of the total amount of power generated by the power generation facility 2 and the planned value of the cost at that time.

[0024] FIG. 7 shows an example of an LCOE planning curve for a BESS. In FIG. 7, the horizontal axis represents the total discharged energy over the life cycle, and the vertical axis represents the BESS-LCOE, and the relationship between the total discharged energy and the BESS-LCOE is shown as an LCOE planning curve. In addition, the planned value of LCOE can be set on the LCOE planning curve. The planned LCOE value (yen / kWh) can be set on the LCOE planning curve based on the planned value of the total discharged energy to be discharged by the charging / discharging equipment 3 and the planned value of the cost at that time.

[0025] In this embodiment, the BESS is based on the reduction of the contract power by the BESS, and when the contract power is expected to be exceeded, the contract power increase cost is added to increase the LCOE. Also, when the battery replacement is expected, the battery replacement cost is added to increase the LCOE. This expresses the value that the BESS provides to the EMS.

[0026] FIG. 8 shows an example of an LCOE planning curve for power purchase. In FIG. 8, the horizontal axis represents the amount of power purchased over the life cycle, and the vertical axis represents Grid-LCOE, and the relationship between the total amount of power purchased and Grid-LCOE is shown as an LCOE planning curve. The planned value of LCOE can be set on the LCOE planning curve. The planned value of the total amount of power purchased that is to be set as the planned value for power purchase in the power control system 1 and the planned value of the cost at that time can be set on the LCOE planning curve. Note that the LCOE planning curve shown in FIG. 8 is based on the premise that the contract fee will not be exceeded over the entire life cycle, but for example, after the contract power is exceeded once, the contract power will be increased, that is, the Grid-LCOE will rise.

[0027] Next, an example of control of the power generation equipment 2 and the charging / discharging equipment 3 by the control device 5 based on the LCOE planned value set as described above will be described. Fig. 9 shows an example of a processing flow by the control device 5 using the LCOE. The control device 5 performs an operation simulation using the predicted data in the order of the prediction process (P1) to the planning process (P2) to calculate the LCOE predicted with the operation for a predetermined planning period. Here, the predetermined planning period is, for example, 24 hours until the next day, and the planned values ​​of each input / output power of each facility are calculated for each unit time (for example, every 30 minutes).

[0028] 9, in a prediction process P1, power consumption by the power consumption equipment 4 for 24 hours in the next day is predicted based on (1) past performance data, (2) weather data (temperature, solar radiation, etc.), and (3) demand characteristic information (operation days, operation plans for large demand, etc.), and the PV power generation amount by the power generation equipment 2 is predicted. Note that the prediction process P1 may be performed by the control device 5 using an existing method, or may be performed by a device other than the control device 5 and the result may be notified to the control device 5.

[0029] In the planning process (P2), based on the predicted values ​​of power consumption and PV power generation calculated in the prediction process P1, planned values ​​of received power, power consumption, PV power generation, and charge / discharge power are set for multiple scenarios (in the example shown in FIG. 9, (1) a scenario in which PV output is suppressed to avoid reverse power, (2) a scenario in which PV surplus is utilized by utilizing a BESS, (3) a scenario in which demand equipment is controlled to create demand, etc.). Then, for each scenario, the LCOE and CO2 emissions for the planning period are calculated, for example, by the control device 5. Next, the control device 5 determines planned values ​​(control policy) of the power generation of the power generation equipment 2, the charging / discharging power of the charging / discharging equipment 3, and part or all of the power consumption of the power consumption equipment 4 during the planning period so that the difference (ΔPV-LCOE) between the predicted value of the first value (PV-LCOE) and the first value (PV-LCOE (planned LCOE value before the installation of the equipment)) and the difference (ΔBESS-LCOE) between the predicted value of the second value (BESS-LCOE) and the second value (BESS-LCOE (planned LCOE value before the installation of the equipment)) predicted in accordance with the operation during the planning period are small. The predicted value of the first value and the predicted value of the second value can be, for example, a predicted value when it is assumed that the planning period (24 hours of the next day) continues during the life cycle, a predicted value when the planned value is updated between the actual value up to the previous day and the plan (24 hours of the next day), and the like. The planned value can be determined, for example, by the control device 5 presenting several options and determining one from the options in accordance with the operator's instructions, or by the control device 5 determining the planned value so as to minimize the difference.

[0030] Fig. 10 shows an example of the process flow up to the decision of a control policy. Fig. 10 shows an example in which the power generation and storage facilities are only PV and BESS, and shows the process flow for deciding a control policy for two scenarios (mode (1): effective use of PV and mode (2): extending the life of BESS). First, in a prediction process P1, PV power prediction (next day) (step S1) and power consumption prediction (next day) (step S2) are performed.

[0031] Next, in the planning process (P2), a planned value (target value) in the planning period in the case of PV total power generation and BESS charging / discharging in mode (1) is set (step S3), and a planned value (target value) in the planning period in the case of PV output restriction and no BESS charging / discharging in mode (2) is set (step S4). Next, an LCOE calculation (PV and BESS) in mode (1) is performed (step S5), and an LCOE calculation (PV, BESS) in mode (2) is performed (step S6). Next, for example, an operation mode in which ΔLCOE is minimized is selected (here, ΔLCOE=ΔPV-LCOE+ΔBESS-LCOE) (step S7). Note that ΔLCOE is the difference between the LCOE planned value before the installation of the equipment and the predicted value in the planning period (24 hours of the next day), ΔPV-LCOE is the difference for PV-LCOE, and ΔBESS-LCOE is the difference for BESS-LCOE.

[0032] FIG. 11 shows an example of each planned value of the input / output power of each facility in mode (1): PV effective use and mode (2): BESS long life. FIG. 12 shows an example of ΔPV-LCOE. FIG. 12 shows a curve of LCOE planned values, LCOE planned values, a predicted value of PV-LCOE on the next day in mode (1) PV effective use mode, and a predicted value of PV-LCOE on the next day in mode (2) BESS long life mode, with the horizontal axis being the power generation amount and the vertical axis being the PV-LCOE. The entire horizontal axis corresponds to a part of the total power generation amount of the lifetime cycle shown in FIG. 6. In this case, the difference of mode (1) is the smallest on the LCOE planned curve.

[0033] FIG. 13 shows an example of ΔBESS-LCOE. FIG. 13 shows a curve of the LCOE planning value, the LCOE planning value, the predicted value of the BESS-LCOE on the next day in the PV efficient use mode of mode (1), and the predicted value of the BESS-LCOE on the next day in the BESS long life mode of mode (2), with the horizontal axis being the discharge amount and the vertical axis being the BESS-LCOE. The entire horizontal axis corresponds to a part of the total discharge amount of the life cycle shown in FIG. 7. In this case, under the same discharge amount, the difference in mode (1) is the smallest. In addition, since the ΔLCOE (=ΔPV-LCOE+ΔBESS-LCOE) obtained by adding up the ΔPV-LCOE shown in FIG. 12 and the ΔBESS-LCOE shown in FIG. 13 for each mode is the smallest in the PV efficient use mode of mode (1), in this case, the PV efficient use mode of mode (1) is adopted.

[0034] FIG. 14 shows another example of ΔBESS-LCOE. FIG. 14 shows a curve of the LCOE planning value, a predicted value of the BESS-LCOE on the next day in the PV effective utilization mode of mode (1), and a predicted value of the BESS-LCOE on the next day in the BESS long life mode of mode (2), with the horizontal axis representing the discharge amount and the vertical axis representing the BESS-LCOE. The entire horizontal axis corresponds to a part of the total discharge amount of the life cycle shown in FIG. 7. FIG. 14 also shows an example of a case where the contract power is exceeded in the prediction, and an example of a case where a battery replacement occurs. As shown in FIG. 14, when the contract power is exceeded in the prediction, and when a battery replacement occurs, the LCOE rises sharply in this case. From the viewpoint of minimizing the LCOE, such a mode is not selected.

[0035] (Action and effect) According to this embodiment, the levelized cost of energy (LCOE) [yen / kWh] is introduced as an index that enables the evaluation of energy costs from a life cycle perspective. This makes it possible to handle costs such as fuel costs, O&M costs, initial equipment costs, disposal costs, equipment replacement costs for batteries, etc., CO2 emission costs, and electricity charges in an integrated manner.

[0036] In addition, by calculating the LCOE of a BESS by adding the following factors as the effects or penalty factors that a BESS brings to an EMS: (1) reduced electricity costs due to a reduction in contract demand, and (2) increased electricity costs due to the need to replace batteries, it becomes possible to operate the BESS while taking into account factors (1) and (2).

[0037] In the above configuration, it is also possible to set up an LCOE plan value at the time of facility installation and operation, and update the LCOE using actual measurement data during operation. In this case, by comparing the LCOE plan with the actual results, it is possible to operate in accordance with the asset investment plan.

[0038] As described above, the power control system 1 of this embodiment includes a power generation equipment 2 that generates power, a charging / discharging equipment 3 that charges and discharges the power, a power consumption equipment 4 that consumes the power, and a control device 5 that controls the generated power of the power generation equipment 2, the charged / discharged power of the charging / discharging equipment 3, and some or all of the power consumed by the power consumption equipment 4. The control device 5 controls some or all of the above during the planning period based on a first value (LCOE (PV-LCOE)) obtained by dividing a first cost (the numerator on the right side of formula (2)) which is the cost over the entire life cycle of the power generation facility 2 by the total amount of power generated during the operation period of the power generation facility 2 (the denominator on the right side of formula (2)), a second value (LCOS (BESS-LCOE)) which is the cost over the entire life cycle of the charging / discharging facility 3 by the total amount of power discharged during the operation period of the charging / discharging facility (the denominator on the right side of formula (3)), a predicted value of power consumption during a predetermined planning period, and a predicted value of power generation during the planning period. According to this aspect and each of the following aspects, various costs can be appropriately considered.

[0039] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included.

[0040] Computer Configuration FIG. 15 shows a schematic configuration of a computer according to this embodiment. The computer 90 comprises a processor 91, a main memory 92, a storage 93, and an interface 94. The above-mentioned control device 5 is implemented in a computer 90. The operations of the above-mentioned processing units are stored in the form of a program in a storage 93. The processor 91 reads the program from the storage 93, loads it in a main memory 92, and executes the above-mentioned processing in accordance with the program. The processor 91 also secures storage areas in the main memory 92 corresponding to the above-mentioned storage units in accordance with the program.

[0041] The program may be for realizing a part of the functions to be performed by the computer 90. For example, the program may be for realizing the functions by combining with other programs already stored in the storage or by combining with other programs implemented in other devices. In another embodiment, the computer may include a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to or instead of the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions to be realized by the processor may be realized by the integrated circuit.

[0042] Examples of the storage 93 include a hard disk drive (HDD), a solid state drive (SSD), a magnetic disk, a magneto-optical disk, a compact disc read only memory (CD-ROM), a digital versatile disc read only memory (DVD-ROM), and a semiconductor memory. The storage 93 may be an internal medium directly connected to the bus of the computer 90, or an external medium connected to the computer 90 via an interface 94 or a communication line. In addition, when the program is distributed to the computer 90 via a communication line, the computer 90 that receives the program may load the program into the main memory 92 and execute the above-mentioned process. In at least one embodiment, the storage 93 is a non-transitory tangible storage medium.

[0043] <Additional Notes> The power control system 1 described in this embodiment can be understood, for example, as follows.

[0044] (1) A power control system 1 according to a first aspect includes a power generation facility 2 that generates power, a charging / discharging facility 3 that charges / discharges the power, a power consumption facility 4 that consumes the power, and a control device 5 that controls the generated power of the power generation facility 2, the charging / discharging power of the charging / discharging facility 3, and a part or all of the power consumption of the power consumption facility 4. The control device 5 calculates a first cost (the numerator on the right side of Equation (2)), which is a cost over the entire life cycle of the power generation facility 2, based on a total amount of power generated during the operation period of the power generation facility 2 (the numerator on the right side of Equation (2)). The part or the whole is controlled during the planning period based on a first value (LCOE (PV-LCOE)), which is a value obtained by dividing the first cost (the numerator on the right side of equation (3)), which is the cost over the entire life cycle of the charging / discharging equipment 3, by the total discharged power amount (the denominator on the right side of equation (3)) during the operation period of the charging / discharging equipment, a second value (LCOS (BESS-LCOE)), which is a value obtained by dividing the second cost (the numerator on the right side of equation (3)), which is the cost over the entire life cycle of the charging / discharging equipment 3, by the total discharged power amount (the denominator on the right side of equation (3)), a predicted value of the power consumption during a predetermined planning period, and a predicted value of the power generation during the planning period. According to this aspect and each of the following aspects, various costs can be appropriately taken into consideration.

[0045] (2) The power control system 1 according to the second aspect is the power control system 1 according to (1), and the second cost (the numerator on the right side of the formula (3)) includes a cost when the contracted power is exceeded (Elec_Penaltyt: increased power purchase cost (penalty) [yen / kWh]) and a cost required for replacing the power storage equipment of the charging / discharging equipment (Battt: BESS battery replacement cost [yen / kWh]). According to this aspect, it is possible to take into account the increase in power cost when the contracted power is exceeded and the increase in power cost due to the occurrence of battery replacement.

[0046] (3) A power control system 1 according to a third aspect is the power control system 1 according to (1) or (2), wherein the control device 5 controls the part or the whole during the planning period so as to reduce a difference between the predicted value of the first value and the first value (ΔPV-LCOE) and a difference between the predicted value of the second value and the second value (ΔBESS-LCOE), which are predicted in association with the operation during the planning period. According to this aspect, the operation of the power generation facility 2 and the charging / discharging facility 3 can be controlled based on a planned value (LCOE planned value) set at the time of installation of the facilities, etc. [Explanation of symbols]

[0047] 1. Power control system 2. Power generation facilities 3…Charging and discharging equipment 4...Power consumption equipment 5. Control device

Claims

1. A power generation facility that generates electricity; A charging and discharging facility for charging and discharging electricity; A power consumption facility that consumes power; a control device that controls a part or all of the generated power of the power generation facility, the charging / discharging power of the charging / discharging facility, and the consumed power of the power consumption facility; Equipped with The control device, a first value obtained by dividing a first cost, which is a cost over the entire life cycle of the power generation facility, by a total amount of power generated during an operation period of the power generation facility; A second value obtained by dividing a second cost, which is a cost over the entire life cycle of the charging / discharging equipment, by a total discharged power amount during an operation period of the charging / discharging equipment; and A predicted value of the power consumption for a predetermined planning period; A predicted value of the generated power during the planning period; and Based on Controlling the part or the whole during the planning period; Power control system.

2. The second cost includes a cost in the case where the contract power is exceeded and a cost required for replacing the power storage equipment of the charging / discharging equipment. The power control system of claim 1 .

3. The control device controls the part or the whole during the planning period so that a difference between a predicted value of the first value and the first value and a difference between a predicted value of the second value and the second value, which are predicted in association with the operation of the planning period, become small.

3. The power control system according to claim 1 or 2.

4. A power generation facility that generates electricity; A charging and discharging facility for charging and discharging electricity; A power consumption facility that consumes power; a control device that controls a part or all of the generated power of the power generation facility, the charging / discharging power of the charging / discharging facility, and the consumed power of the power consumption facility; Using The control device, a first value obtained by dividing a first cost, which is a cost over the entire life cycle of the power generation facility, by a total amount of power generated during an operation period of the power generation facility; A second value obtained by dividing a second cost, which is a cost over the entire life cycle of the charging / discharging equipment, by a total discharged power amount during an operation period of the charging / discharging equipment; and A predicted value of the power consumption for a predetermined planning period; A predicted value of the generated power during the planning period; and Based on controlling said part or all of said during said planning period; A power control method comprising:

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