Power management apparatus, power management system, and power management method

Abstract

The management device has a first calculation section that calculates an amount of third power that can be supplied based on a power generation condition of first power using a renewable energy and a condition of second power after the first power is stored to an electricity storage system, a second calculation section that calculates a supply amount of power supplied to a user based on demand information of the user, and a decision section that decides, based on the supply amount of power supplied to the user, an amount of power that is traded in a power market among the third power and an amount of power that is traded bilaterally with the user without using the power market.

Description

Technical Field

[0001] This invention relates to power management devices, power management systems, and power management methods. Background Technology

[0002] There is currently a virtual power plant (VPP), which is a mechanism that unifies the control of distributed energy resources such as renewable energy, power generation equipment, batteries or electric vehicles, thereby providing functions similar to a power plant.

[0003] Furthermore, there is a known method for electricity trading that can stably supply electricity generated from renewable energy sources such as solar or wind power. For example, there is a known method for electricity trading that determines the electricity trading market for which electricity trading takes place based on electricity prices, capacity, and renewable energy identification information in the electricity trading market, and conducts electricity trading based on the energy storage status of the energy storage system (for example, see Patent Document 1).

[0004] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2023-160733 Summary of the Invention The technical problem that the invention aims to solve The prior art disclosed in Patent Document 1 only addresses market transactions in the electricity market. However, relying solely on market transactions presents the problem that revenue can decline if market conditions deteriorate.

[0005] One aspect of the present invention is made in view of the above-mentioned problems, with the aim of enabling electricity generated from renewable energy sources to be supplied at a more stable price.

[0006] Methods for solving problems A management device according to one aspect of the present invention comprises: a first calculation unit that calculates the amount of a third power available for supply based on the power generation status of a first power source utilizing renewable energy and the status of a second power source obtained by storing the first power source in a power storage system; a second calculation unit that calculates the amount of power supplied to the user based on user demand information; and a decision unit that, based on the amount of power supplied to the user, determines, within the third power source, the amount of power to be traded in the electricity market and the amount of power not traded bilaterally with the user through the electricity market.

[0007] The effects of the invention According to one aspect of the invention, it is possible to supply electricity generated from renewable energy sources at a more stable price. Attached Figure Description

[0008] 【 Figure 1The diagram shows an example of the system structure of the power management system involved in this embodiment.

[0009] 【 Figure 2 [A diagram used to illustrate the outline of the power management method involved in this embodiment.]

[0010] 【 Figure 3 [A diagram showing an example of a computer's hardware structure.]

[0011] 【 Figure 4 The diagram shows an example of the functional structure of the power management device involved in this embodiment.

[0012] 【 Figure 5A [1] An example diagram showing the information managed by the power management device involved in this embodiment.

[0013] 【 Figure 5B [Figure 2] shows an example diagram of the information managed by the power management device involved in this embodiment.

[0014] 【 Figure 6A [3] An example diagram showing the information managed by the power management device involved in this embodiment is shown.

[0015] 【 Figure 6B [4] An example diagram showing the information managed by the power management device involved in this embodiment is shown.

[0016] 【 Figure 6C [5] An example diagram showing the information managed by the power management device involved in this embodiment.

[0017] 【 Figure 7A [6] An example diagram showing the information managed by the power management device involved in this embodiment is shown.

[0018] 【 Figure 7B [7] An example diagram showing the information managed by the power management device involved in this embodiment is shown.

[0019] 【 Figure 8 [1] Sequence diagram of the processing example of the power management system involved in Example 1.

[0020] 【 Figure 9 [2] Sequence diagram of the processing example of the power management system involved in Example 1.

[0021] 【 Figure 10 [1] Sequence diagram of the processing example of the power management system involved in Example 2.

[0022] 【 Figure 11 The flowchart of the decision processing example involved in Example 2.

[0023] 【 Figure 12 [2] Sequence diagram of the processing example of the power management system involved in Example 2. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in this specification and the accompanying drawings, redundant descriptions of constituent elements having substantially the same functional structure are omitted by assigning the same reference numerals.

[0025] <System Structure> Figure 1 This is an example diagram illustrating the system structure of the power management system involved in this embodiment. The power management system 100 is, for example, a system that uses an energy storage system 120 to manage electricity generated from renewable energy sources such as solar or wind power, so as to stably supply and sell it to users 20 and the electricity market 30, etc.

[0026] exist Figure 1 In the example, the power management system 100 includes a power management device 110 capable of communicating with one or more power generation systems 10, energy storage systems 120, user systems 21, and power market systems 31, as well as an energy storage system 120. In this embodiment, the power management device 110 is equivalent to a virtual power plant (VPP).

[0027] The power generation system 10 is, for example, a power plant that generates electricity using renewable energy sources such as solar or wind power. Furthermore, the power generation system 10 is not limited to industrial power generation systems; for example, it may include multiple residential solar power generation systems. Additionally, the power management system 100 may include at least a portion of the power generation system 10, or it may be a system utilizing an external power generation system 10.

[0028] The energy storage system 120 is, for example, a battery (e.g., an industrial energy storage system and a grid battery) that stores the electricity generated by the power generation system 10 using renewable energy (hereinafter referred to as renewable energy electricity) according to the settings from the power management device 110.

[0029] User 20 purchases electricity supplied by electricity retailers, such as businesses, factories, merchants, or other retailers, from the electricity management system 100. User system 21 is the information processing device or information processing system used by user 20.

[0030] The electricity market 30 is a market for trading electricity, including electricity from renewable energy sources. The electricity market 30 includes, for example, the wholesale electricity market, the supply and demand regulation market, the capacity market, and the non-fossil value trading market. The wholesale electricity market is a market for trading electricity volume (kWh). The supply and demand regulation market is a market for trading regulatory capacity used to balance electricity supply and demand. The non-fossil value trading market is a market for trading certificates representing the "non-fossil value" of electricity generated using renewable energy sources or non-fossil fuels such as nuclear power.

[0031] Electricity market system 31 is an information processing device or information processing system used for market transactions in electricity market 30.

[0032] The power management device 110 is an information processing device with a computer architecture, or a system containing multiple computers. The power management device 110 can be communicatively connected to the power generation system 10, the energy storage system 120, the user system 21, and the power market system 31, for example, through communication networks such as the Internet and LAN (Local Area Network).

[0033] The power management device 110 has the function of combining the following two for trading: for example, the function of retail supplying renewable energy generated by the power generation system 10 and the electricity stored in the energy storage system 120 as a bilateral transaction to the user 20; and market trading in the power market 30.

[0034] Here, bilateral transactions refer to a transaction method where buyers and sellers directly agree on prices and quantities without going through a market. In market transactions, prices are determined by the balance of supply and demand, but in bilateral transactions, the buying and selling prices can be freely determined regardless of market supply and demand. For example, it is known that when supply and demand balance deteriorates and output control occurs, market prices may drop to 0.01 yen / kWh. When renewable energy operators are third parties, they can obtain stable or fixed income by charging at this time, storing the cheaply purchased electricity in batteries, and then supplying the electricity to users through time transfer.

[0035] Figure 2 This is a diagram used to illustrate an overview of the power management method involved in this embodiment. Figure 2 In the middle, assuming retailer 210 utilizes Figure 1 The power management device 110 described herein manages the renewable energy power generated by the power generation system 10 (hereinafter referred to as the first power) and the power stored in the energy storage system 120 (hereinafter referred to as the second power).

[0036] In step S1, the power management device 110 predicts the power generation of the power generation system 10 based on the power generation status of the power generation system 10. For example, the power management device 110 predicts the power generation 201 of each power generation system 10 for the next day based on the power generation status of each power generation system 10, and sums up the predicted power generation 201 to predict the first power generation 202 as the overall power generation of the power generation system 10 for the next day.

[0037] In step S2, the power management device 110 predicts the amount of electricity 205 to be supplied to user 20 based on the user 20's demand information. Here, the electricity supplied to the user includes first electricity as renewable energy and second electricity that has been stored as renewable energy.

[0038] In step S3, the power management device 110 sets the remaining power 204, after deducting the power supply 205 supplied to user 20 from the power generation 202 of the first power generation of the next day, as the charging plan for the energy storage system 120 for the next day, for example, by charging the energy storage system 120. Furthermore, if the power supply 205 supplied to user 20 cannot be supplemented by the power generation 202 of the first power generation of the next day alone, the power management device 110 sets the discharging plan for the energy storage system 120 for the next day, for example, by discharging the insufficient power 207.

[0039] Thus, on the next day, retailer 210 can not only supply the first power generated by power generation system 10 to user 20 (step S4), but also supply the insufficient power 207 released by energy storage system 120 as the second power to user 20 (step S5).

[0040] Furthermore, if a shortfall of electricity 208 remains after deducting the insufficient electricity 207 released by the energy storage system 120 from the remaining electricity 204 used to charge the energy storage system 120, the retailer 210 forecasts the market price and sells the shortfall of electricity 208 in the electricity market 30 according to the market price. Preferably, the retailer 210 bids or selects a trading partner for the commodity with the highest price based on the market price forecast and bilateral prices. Preferably, if the market price forecast is low, the retailer 210 can store the shortfall of electricity 208 in the energy storage system 120, or it can be stored in the energy storage system 120 and then supplied to other users.

[0041] As described above, the power management system 100 of this embodiment combines market transactions and bilateral transactions, enabling increased flexibility in electricity procurement prices even when market prices fall. This is achieved through time shifts caused by energy storage, the selection of various market commodities, and the combination of bilateral transactions. Furthermore, it stabilizes revenue by fixing the supply price (from the selling price when the battery discharges). Moreover, even when market prices rise, the power management system 100 can stably supply renewable energy electricity.

[0042] <Hardware Structure> The power management device 110 according to this embodiment has, for example, Figure 3 The hardware structure of the computer 300 shown is illustrated. Alternatively, the power management device 110 may be implemented by multiple computers 300.

[0043] Figure 3 This is a diagram illustrating an example of computer hardware architecture. (For example...) Figure 3 As shown, the computer 300 includes a CPU (Central Processing Unit) 301, ROM (Read Only Memory) 302, RAM (Random Access Memory) 303, HDD (Hard Disk Drive) 304, input device 305, display device 306, communication I / F (Interface) 307, and external I / F 308. The CPU 301, ROM 302, and RAM 303 constitute what is called a computer. The various hardware components of the computer 300 are interconnected via bus lines 309. Furthermore, the input device 305 and display device 306 can also be connected to the external I / F 308 for use.

[0044] The CPU 301 reads programs and data from storage devices such as ROM 302 or HDD 304 into RAM 303, and performs processing to control the overall computer 300 and its various functions. In addition to (or replacing) the CPU 301, the computer 300 may also have a GPU (Graphics Processing Unit).

[0045] ROM 302 is an example of a non-volatile semiconductor memory (storage device) that retains programs and data even when power is cut off. ROM 302 functions as the main storage device, storing various programs and data required by the CPU 301 to execute various programs installed in HDD 304. Specifically, ROM 302 stores boot programs such as BIOS (Basic Input / Output System) and EFI (Extensible Firmware Interface) that are executed when the computer 300 starts, as well as OS (Operating System) settings or network settings and other data.

[0046] RAM 303 is an example of a volatile semiconductor memory (storage device) whose programs and data are erased when power is cut off. RAM 303 is, for example, DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory). RAM 303 provides the working area that unfolds when various programs installed in HDD 304 are executed by CPU 301.

[0047] HDD 304 is an example of a non-volatile storage device that stores programs, data, and other data. Programs stored in HDD 304 include, for example, an operating system (OS) that forms the basis of the computer 300 and various applications that provide functions on the OS. Alternatively, the computer 300 may use a storage device that uses flash memory as the storage medium (e.g., an SSD: SolidState Drive) instead of HDD 304.

[0048] Input device 305 includes touch panels, operation keys and buttons, keyboards and mice, or microphones for users to input various signals, such as voice. Display device 306 consists of a liquid crystal or organic EL (Electro-Luminescence) display for showing images, and speakers for outputting voice data. Communication I / F 307 is an interface for connecting to a communication network N, enabling data communication between computer 300 and external devices. External I / F 308 is an interface for connecting to external devices. External devices include drive devices such as driver 310.

[0049] The drive unit 310 is a device for setting the recording medium 311. The recording medium 311, as referred to here, includes media that optically, electrically, or magnetically record information, such as CD-ROMs, floppy disks, and magneto-optical disks. Furthermore, the recording medium 311 may also include semiconductor memories such as ROMs or flash memory that electrically record information. Thus, the computer 300 can read from and write to the recording medium 311 via an external I / F 308.

[0050] Additionally, various programs installed in the HDD 304 can be installed, for example, by placing the distributed recording medium 311 in a drive unit 310 connected to the external I / F 308, and by having the drive unit 310 read the various programs recorded on the recording medium 311. Alternatively, various programs installed in the HDD 304 can also be installed via communication I / F 307 by downloading from a network different from the communication network.

[0051] <Functional Structure> Figure 4 This is an example diagram illustrating the functional structure of the power management device according to this embodiment. The power management device 110 implements, for example, [the following is an example of its functionality] by executing a predetermined program in a computer included in the power management device 110. Figure 4 The functional structures shown are as follows. Figure 4 In the example, the power management device 110 has various functional structures, including a communication unit 401, a power generation forecasting unit (first forecasting unit) 402, a power supply calculation unit (first calculation unit) 403, a power demand forecasting unit (second forecasting unit) 404, a power supply calculation unit (second calculation unit) 405, a decision unit 406, a charge / discharge control unit 407, a supply performance management unit 408, a certificate management unit 409, a transaction management unit 410, and a storage unit 411. Furthermore, at least some of the above functional structures can also be implemented in hardware.

[0052] The communication unit 401, for example, uses the communication I / F 307 to connect the power management device 110 to the communication network N and performs communication processing to communicate with the power generation system 10, the energy storage system 120, the user system 21, and the power market system 31.

[0053] The power generation forecasting unit (first forecasting unit) 402 performs a first forecasting process to forecast the amount of first power generated, based on the power generation status of first power generated using renewable energy.

[0054] For example, the power management device 110 receives power from the power generation system 10 such as Figure 5AThe power generation status notification 510 shown is an example of a first power generation status. The power generation status notification 510 contains time-series power generation data 511a, 511b, and 511c from one or more power generation systems 10. Figure 5A In the example, the time series power generation data 511a, 511b, and 511c store power generation (kW) data monitored at a 1-minute interval.

[0055] The power generation forecasting unit 402 uses time-series power generation data 511a, 511b, and 511c, for example... Figure 5B As shown, time series forecasts 521a, 521b, and 521c are used to predict the power generation of more than one power generation system 10 on the following day.

[0056] The methods for predicting power generation can be, for example, statistical predictions using environmental forecasting data such as sunshine duration and temperature, or predictions based on machine learning. In this embodiment, no particular limitation is placed on the method for predicting power generation.

[0057] exist Figure 5B In the example, the predicted values ​​521a, 521b, and 521c of the time series store the predicted power generation values ​​for each power generation system for 10 days, arranged every 30 minutes. The power generation prediction unit 402, for example, predicts the first power generation 520 for the next day by summing the predicted values ​​521a, 521b, and 521c of the time series.

[0058] Furthermore, the power management device 110 does not necessarily need to have a power generation prediction unit 402. For example, the power management device 110 may obtain prediction results from the power generation prediction unit 402 of the power generation system 10 or the system that manages the power generation system 10, or from an independent prediction system.

[0059] The power calculation unit (first calculation unit) 403 can perform a first calculation process to calculate the amount of third power that can be supplied, based on the power generation status of the first power and the status of the second power stored in the energy storage system 120.

[0060] For example, the power management device 110 receives power from the energy storage system 120 such as Figure 6A The battery status notification 610 is shown. Figure 6AIn the example, the power storage status notification 610 includes time-series charge / discharge plan data 611 and SoC (State of Charge) data 612 representing the power storage status of the power storage system 120. Furthermore, the power storage status of the power storage system 120 is an example of a second power status. The charge / discharge plan data 611 uses negative values ​​to indicate charging and positive values ​​to indicate discharging, indicating whether the power storage system 120 is charging or discharging every minute. The SoC data 612 is an indicator representing the charge rate or state of charge of the power storage system 120.

[0061] The power calculation unit 403 can calculate, for example, the amount of second power that the energy storage system 120 can supply on the next day based on the charge / discharge plan data 611 and the SoC data 612. Furthermore, the power calculation unit 403 can calculate the amount of third power that the power management system 100 can supply on the next day based on the first power generation 520 predicted by the power generation forecast unit 402 and the amount of second power that the energy storage system 120 can supply on the next day. As another example, the power calculation unit 403 can also use the first power generation 520 predicted by the power generation forecast unit 402 on the next day as the amount of third power that can be supplied on the next day.

[0062] The demand power forecasting unit (second forecasting unit) 404 performs a second forecasting process to calculate the power demand of user 20 based on the demand information of user 20.

[0063] For example, the power management device 110 receives data from the user system 21 such as... Figure 6B The demand information 620 shown is included. The demand information 620 includes, for example, user 20's contract information 621 and user 20's electricity demand data 622.

[0064] exist Figure 6B In the example, contract information 621 includes information such as contracted electricity, contracted unit price, and renewable energy ratio. However, this is just an example; this information could also be associated with, for example, a Customer ID and stored in storage unit 411, etc. Contracted electricity is the maximum amount of electricity that user 20 can use. Contracted unit price is the cost per unit of electricity, which may vary over time. Renewable energy ratio refers to the proportion of renewable energy power supplied to user 20. Figure 6B The example shows that, since the proportion of renewable energy is 100%, all the electricity supplied to user 20 is based on renewable energy (first electricity and second electricity).

[0065] Demand Power Forecasting Department 404, for example, according to Figure 6B The power demand data for user 20 shown is 622, as follows: Figure 6CAs shown, the electricity demand 631 of user 20 is predicted for the next day. For example, the electricity demand forecasting unit 404 can use industry-standard methods such as "High 4 of 5" to predict the electricity demand 631 of user 20. Alternatively, the electricity demand forecasting unit 404 can predict the electricity demand 631 of user 20 by classifying past electricity consumption data into days of the week, business days, non-business days, etc., and then performing linear interpolation. In this embodiment, there are no particular limitations on the method for predicting the electricity demand of user 20.

[0066] Furthermore, the power management device 110 does not necessarily need to have a demand power forecasting unit 404. For example, the power management device 110 can also obtain the forecast results from the demand power forecasting unit 404 provided in the user system 21, etc.

[0067] The power supply calculation unit 405 calculates the amount of electricity to be supplied to user 20 based on the forecast results of the demand power forecasting unit 404 and the contract information 621 of user 20. For example, the power supply calculation unit 405 calculates the amount of electricity to be supplied to user 20 by multiplying the electricity demand of user 20 by the proportion of renewable energy. Furthermore, when there are multiple users 20, the power supply calculation unit 405 sums up the amount of electricity supplied to each user to calculate the amount of electricity to be supplied to user 20.

[0068] The decision-making unit 406 performs decision processing, and based on the amount of electricity supplied to user 20, determines the amount of electricity to be traded in the electricity market 30 and the amount of electricity to be traded bilaterally with user 20 without going through the electricity market 30, from the available third electricity supply.

[0069] For example, the decision unit 406 prioritizes allocating the available third-party electricity to the electricity traded bilaterally with user 20. Furthermore, the decision unit 406 considers the remaining third-party electricity after removing the electricity traded bilaterally with user 20 from the available third-party electricity as candidates for market trading in the electricity market 30.

[0070] Preferably, the decision unit 406 further determines the amount of electricity to be traded in the electricity market 30 based on price information (electricity price and price of non-fossil certificates, etc.) in the electricity market 30. For example, the decision unit 406 bases its decision on, for example, the price of electricity in the electricity market 30 and the price of non-fossil certificates, etc. Figure 7A The next day's market price forecast data 710 shows that during periods of high market prices, the amount of electricity traded in the electricity market 30 is increased. On the other hand, during periods of low market prices, the decision unit 406 increases the amount of first electricity stored in the energy storage system 120 and reduces or cancels the amount of electricity traded in the electricity market 30.

[0071] The charge / discharge control unit 407 executes charge / discharge control processing to control the charging and discharging of the energy storage system 120 based on the amount of electricity traded in the electricity market 30, the amount of electricity traded bilaterally with the user 20, or the amount of first electricity stored in the energy storage system 120, as determined by the decision unit 406. For example, the charge / discharge control unit 407, as in... Figure 2 As explained in step S3, the settings of the next-day energy storage system 120 are updated in order to discharge the insufficient power 207. In addition, the charge and discharge control unit 407 also updates the settings of the next-day energy storage system 120 in order to charge the amount of the first power generated by the power generation system 10 and the amount of the first power stored in the energy storage system 120 determined by the determination unit 406.

[0072] The Supply Performance Management Department 408 performs supply performance management processing to manage the performance of renewable energy electricity supplied to User 20. For example, the Supply Performance Management Department 408 manages data on the renewable energy electricity supplied to User 20 and provides User 20 with information such as... Figure 7B The actual renewable energy supply figure shown is 720.

[0073] Certificate Management Department 409 performs certificate management processing for renewable energy electricity certificates. For example, Certificate Management Department 409 manages the generation and supply performance of renewable energy electricity and, through external certificate issuing agencies, certifies the environmental value of renewable energy electricity. Furthermore, Certificate Management Department 409 provides user 20 with certificates for the renewable energy electricity supplied to user 20. Renewable energy electricity certificates include, but are not limited to, non-fossil certificates or green electricity certificates.

[0074] The Transaction Management Department 410 performs transaction management processing for market transactions in the electricity market 30. For example, when market prices are high, the Transaction Management Department 410 will sell the first electricity determined by the Decision Department 406 in the electricity market 30. Similarly, the Transaction Management Department 410 sells certificates for renewable energy electricity in the electricity market 30.

[0075] Storage Department 411 stores various data, information, programs, and settings, including renewable energy supply performance 720 managed by Supply Performance Management Department 408 and renewable energy power certificates managed by Certificate Management Department 409.

[0076] also, Figure 4 The functional structure of the power management device 110 shown is merely an example. For instance, the power generation forecasting unit 402 or the demand power forecasting unit 404 could also be located outside the power management device 110. Furthermore, Figure 4The functional structures of the power management device 110 shown can also be distributed among multiple devices. For example, the demand power forecasting unit 404, the supply power calculation unit 405, and the supply performance management unit 408 can also be located in a supply and demand management device 420 or other devices that are independent of the power management device 110.

[0077] <Processing Flow> Next, the processing flow of the power management method involved in this embodiment will be explained.

[0078] [Example 1] Figure 8 This is a sequence diagram (1) illustrating an example of a power management system process according to Embodiment 1. The process, for example, has... Figure 1 An example of the processing performed by the power management system 100 of the system architecture shown before (e.g., the day before) supplying renewable energy power to user 20.

[0079] In step S801, the power generation prediction unit 402 of the power management device 110 receives a power generation status notification from the power generation system 10 via the communication unit 401. For example, the power generation prediction unit 402 receives a notification such as... Figure 5A The power generation status notification shown is 510.

[0080] In step S802, the power generation prediction unit 402 predicts the first power generation of the power generation system 10 based on the received power generation status notification. For example, the power generation prediction unit 402 predicts the first power generation of the power generation system 10 based on the received power generation status notification 510, such as... Figure 5B As explained, the predicted first power generation of the power generation system on the 10th day is 520.

[0081] In step S803, the power supply calculation unit 403 of the power management device 110 receives a power storage status notification from the energy storage system 120 via the communication unit 401. For example, the power supply calculation unit 403 receives, for instance, a notification about the energy storage status. Figure 6A The battery status notification shown is 610.

[0082] In step S804, the power calculation unit 403 can calculate the amount of third power that can be supplied to the recipient. For example, the power calculation unit 403 can calculate the amount of second power that the energy storage system 120 can supply on the next day based on the charge / discharge plan data 611 and SoC data 612 included in the received energy storage status notification 610. Furthermore, the power calculation unit 403 can calculate the amount of third power that the power management system 100 can supply on the next day based on the first power generation 520 predicted by the power generation forecast unit 402 for the next day, and the amount of second power that the energy storage system 120 can supply on the next day.

[0083] In step S805, the demand power forecasting unit 404 of the power management device 110 receives demand information from the user system 21 via the communication unit 401. For example, the demand power forecasting unit 404 receives, for example, demand information such as demand forecasting unit 404 receiving ... Figure 6B The required information shown is 620.

[0084] In step S806, the demand power forecasting unit 404 forecasts the power demand of user 20 based on the received demand information. For example, the demand power forecasting unit 404 forecasts the power demand of user 20 based on the received demand information 620, such as... Figure 6C As explained, the user's electricity demand is predicted for 20 days from now.

[0085] In step S807, the power supply calculation unit 405 of the power management device 110 calculates the amount of electricity to be supplied to user 20. For example, the power supply calculation unit 405 calculates the amount of electricity to be supplied to user 20 on the next day based on the electricity demand of user 20 predicted by the demand power forecasting unit 404 and the contract information 621 contained in the demand information 620. For example, the power supply calculation unit 405 calculates the amount of electricity to be supplied to user 20 on the next day by multiplying the electricity demand of user 20 on the next day by the renewable energy ratio contained in the contract information 621.

[0086] In step S808, the decision unit 406 of the power management device 110 obtains market price forecast data from, for example, the power market system 31. For example, the decision unit 406 obtains... Figure 7A The market price forecast data for the next day shown is 710.

[0087] In step S809, the decision unit 406, based on the amount of electricity supplied to user 20 the following day, determines the amount of electricity to be traded in the electricity market 30 and the amount to be traded bilaterally with user 20 from the available third electricity supply. For example, the decision unit 406 prioritizes allocating the available third electricity to the electricity traded bilaterally with user 20. Furthermore, the decision unit 406 determines the amount of electricity to be traded in the electricity market 30 based on acquired market price forecast data.

[0088] In step S810, the charge / discharge control unit 407 of the power management device 110 sets a charge / discharge instruction (plan) for the energy storage system 120 based on the amount of electricity traded in the electricity market 30 and the amount of electricity traded bilaterally with the user 20, as determined by the decision unit 406. For example, during a period when the amount of first-order electricity generated by the power generation system 10 is less than the amount supplied to the user 20, the charge / discharge control unit 407 instructs the energy storage system 120 to discharge. Furthermore, during a period when the amount of first-order electricity generated by the power generation system 10 is greater than the amount supplied to the user 20, and when the amount of electricity traded in the electricity market 30 is low (or nonexistent), the charge / discharge control unit 407 instructs the energy storage system 120 to charge.

[0089] In step S811, the transaction management unit 410 of the power management device 110 submits a bid (auction) for renewable energy power to the power market system 31 based on the amount of electricity to be traded in the power market 30 as determined by the decision unit 406.

[0090] In step S812, when a bid for renewable energy power is successfully executed, a notification of the successful bid is sent from the electricity market system 31 to the power management device 110. Furthermore, if the decision unit 406 determines that the electricity volume to be traded in the electricity market 30 is 0, then steps S811 and S812 are omitted.

[0091] Figure 9 This is a sequence diagram (2) illustrating an example of a power management system process involved in Embodiment 1. This process, for example, has... Figure 1 The power management system 100 with the system structure shown completes the execution of... Figure 8 An example of processing performed after the previous processing (e.g., the next day).

[0092] In step S901, the power generation system 10 generates first electricity using renewable energy. Furthermore, in step S902, the first electricity generated by the power generation system 10 is supplied to the energy storage system 120 and users such as 20.

[0093] In step S903, the energy storage system 120 follows... Figure 8 In step S810, the power is charged and discharged according to the charge / discharge indication set by the power management device 110. For example, the energy storage system 120 charges the first power during the time period when the charge / discharge indication is "charging". On the other hand, during the time period when the charge / discharge indication is "discharging", the energy storage system 120 supplies the second power to the user 20 by discharging the second power formed by storing the first power in the energy storage system 120 (step S904).

[0094] In step S905, the power supply performance management unit 408 of the power management device 110 receives a power generation status notification from the power generation system 10 via the communication unit 401. The format of this power generation status notification is, for example, similar to... Figure 5A The same applies to the power generation status notification 510.

[0095] In step S906, the supply performance management unit 408 receives a power storage status notification from the power storage system 120 via the communication unit 401. The format of this power storage status notification is, for example, similar to... Figure 6A The battery status notification in 610 should be the same.

[0096] In step S907, the supply performance management department 408 registers the performance of supplying renewable energy electricity to user 20.

[0097] In step S908, the supply performance management department 408, based on the performance of supplying electricity to user 20, generates a record as follows: Figure 7B The actual renewable energy supply performance 720 is shown and notified to the user system 21.

[0098] [Example 2] Figure 10 This is a sequence diagram (1) illustrating an example of a power management system process according to Embodiment 2. The process, for example, has... Figure 1 The power management system 100 shown in the diagram is another example of the processing performed by the system before (e.g., the day before) supplying renewable energy power to user 20. Additionally, in Figure 10 In the processing, the processing of steps S801-807 and S810-812 is the same as... Figure 8 The processing described herein is the same, so the explanation is omitted here.

[0099] In step S1001, the decision unit 406 of the power management device 110 calculates the amount of fourth power, which is the difference between the first power generation predicted by the power generation prediction unit 402 and the power supply to the user 20 calculated by the power supply calculation unit 405. The amount of fourth power calculated here is positive when there is surplus first power and negative when there is insufficient first power.

[0100] In step S1002, the transaction management unit 410 of the power management device 110 obtains price signals such as market prices, prices from other companies, or predicted prices predicted by forecasting companies from the power market system 31, for example.

[0101] In step S1003, the transaction management unit 410 predicts the market price (e.g., the market price for the next day) based on the acquired price signal. Similarly, the power management device 110 can also have the function of predicting the market price of the power market 30. However, in Embodiment 2, the power management device 110 can also acquire market price prediction data from an external source, as in Embodiment 1.

[0102] In step S1004, the decision unit 406 performs, for example... Figure 11 The decision processing is shown.

[0103] Figure 11 This is a diagram illustrating an example of the decision processing involved in Embodiment 2. The processing is shown, for example, as follows: Figure 10 An example of the decision processing performed by the decision unit 406 in step S1004.

[0104] In step S1101, the decision unit 406 determines whether the process is within a time period where the fourth power is >0 (the fourth power is a positive value). If the process is within a time period where the fourth power is >0, the decision unit 406 moves the processing to step S1102. On the other hand, if the process is not within a time period where the fourth power is >0, the decision unit 406 moves the processing to step S1105.

[0105] After proceeding to step S1102, the decision unit 406 determines whether the market price during that time period is cheap (whether it is below a predetermined threshold). If the market price is cheap, the decision unit 406 proceeds to step S1103. On the other hand, if the market price is not cheap, the decision unit 406 proceeds to step S1104.

[0106] After moving from step S1102 to step S1103, the decision unit 406 decides to charge the fourth power into the energy storage system 120 during that time period. In this way, the decision unit 406 calculates the amount of remaining or insufficient fourth power based on the generation of the first power and the power supply to the user 20, and stores the fourth power in the energy storage system 120 during the time period when the fourth power is remaining, especially during periods when the electricity market price is cheaper.

[0107] After moving from step S1102 to step S1104, the decision unit 406 decides to put the fourth electricity of that time period up for sale in the electricity market 30.

[0108] After moving from step S1101 to step S1105, the decision unit 406 determines whether the time period belongs to a period where the fourth power is <0 (the fourth power is a negative value). If the fourth power is <0, the decision unit 406 moves the processing to step S1106. On the other hand, if the fourth power is not <0, the decision unit 406 ends. Figure 11 The processing.

[0109] After moving to step S1106, the decision unit 406 sets the discharge plan of the energy storage system 120 to make up for the insufficient amount of fourth power during that time period.

[0110] pass Figure 11 The decision-making unit 406 can determine the destination of surplus renewable energy supply when there is surplus renewable energy, and the amount of renewable energy discharged when the renewable energy supplied to users 20 is insufficient.

[0111] in addition, Figure 11 The processing is an example of the decision processing determined by decision unit 406. For example, in Figure 11 In step S1103, the decision unit 406 may also decide to use at least a portion of the remaining power during that time period as power to supply other systems that store the remaining power.

[0112] Figure 12 This is a sequence diagram (2) illustrating an example of a power management system process involved in Embodiment 2. This process, for example, has... Figure 1 The power management system 100 with the system structure shown completes the execution of... Figure 10 An example of processing performed after the current processing (e.g., the next day). Additionally, Figure 12 Processing in steps S901 to S906 Figure 9 The processing described herein is the same, so the explanation is omitted here.

[0113] In step S1201, the power management device 110's supply performance management unit 408 registers the power generation performance of renewable energy.

[0114] In step S1202, the certificate management unit 409 of the power management device 110 obtains a renewable energy power certificate from the certificate issuing authority based on the actual power generation performance of renewable energy power. Furthermore, under the current system, once renewable energy power is stored in a storage system 120 or similar device, the power released from the storage system 120 is no longer considered renewable energy power; therefore, it needs to be certified to demonstrate that the power released from the storage system 120 is based on renewable energy power.

[0115] In step S1203, the Supply Performance Management Department 408 sends the renewable energy power supply performance and the renewable energy power certificates supplied to the user system 21.

[0116] In step S1204, if the generated renewable energy power exceeds the supplied renewable energy power, the transaction management department 410 sells certificates in the electricity market 30.

[0117] As described above, the power management system 100 according to this embodiment combines market transactions and bilateral transactions, which increases the flexibility of power procurement even when market conditions deteriorate, and achieves revenue stabilization and supply stabilization by fixing the supply price.

[0118] (Variation Example 1) In the above embodiments, it is described that the energy storage system 120 is a battery (e.g., an industrial energy storage system) that stores renewable energy power generated by the power generation system 10 using renewable energy. However, this is only an example, and the energy storage system 120 may also include multiple residential energy storage systems, or multiple EVs (electric vehicles), etc.

[0119] (Variation Example 2) In addition, the energy storage system 120 may also include, for example, a hydrogen production device that uses renewable energy power to produce hydrogen, an organic hydride production device that uses renewable energy power to produce organic hydrides, or a pumped-storage power generation system that uses renewable energy power for pumped-storage energy storage.

[0120] For example, hydrogen produced using renewable energy in a hydrogen production facility can be stored in a storage tank and used to generate electricity in a fuel cell or hydrogen power generation device. Alternatively, organic hydrides can be produced using renewable energy in an organic hydride production facility, and the hydrogen extracted from the organic hydrides through a dehydrogenation reaction can be introduced into a power generation device to generate electricity. Thus, the energy storage system 120 according to this embodiment can include various systems that directly or indirectly store renewable energy electricity.

[0121] Furthermore, the inclusion of an organic hydride manufacturing device in the energy storage system 120 has the advantage that organic hydrides, compared to batteries or hydrogen, can be stored for extended periods without loss, thus providing a regulating capacity over long periods. In addition, organic hydrides have the advantage of being usable as a power source for supply and demand regulation even in areas not covered by urban gas pipelines.

[0122] (Variation Example 3) exist Figure 11 In step S1101 of the decision processing described above, the decision unit 406 charges the energy storage system 120 with the remaining power during that time period. However, it is not limited to this; the decision unit 406 may also decide to use at least a portion of the remaining power during that time period as power to supply various systems that store remaining power, such as hydrogen production units, organic hydride production units, or pumped-storage power generation systems. In this case, Figure 11In step S1106, the decision unit 406 only needs to set a power generation plan using hydrogen, organic hydrides or pumped hydro storage to make up for the insufficient amount of fourth electricity during that time period.

[0123] In summary, according to this embodiment, electricity generated from renewable energy sources can be supplied at a more stable price and with less impact from weather and time.

[0124] <Supplement> The functions of the embodiments described above can be implemented by one or more processing circuits. Here, "processing circuit" in this specification includes processors such as CPUs or GPUs implemented by electronic circuits and programmed by software to perform various functions, or devices such as ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), FPGAs (Field Programmable Gate Arrays), or conventional circuit modules designed to perform the functions described above.

[0125] <Summary of Implementation Methods> This specification discloses at least the power management device, power management system, power management method, and procedure listed below.

[0126] (Note 1) A power management device, comprising: The first calculation unit calculates the amount of third electricity that can be supplied, based on the power generation status of the first electricity generated using renewable energy sources and the status of the second electricity obtained by storing the first electricity in an energy storage system. The second calculation unit calculates the amount of electricity to be supplied to the user based on the user's demand information, and The decision-making department, based on the amount of electricity supplied to the user, determines the amount of the third electricity that will be traded in the electricity market and the amount that will be traded bilaterally with the user without going through the electricity market.

[0127] (Note 2) The power management device according to Appendix 1 has a first prediction unit that predicts the amount of power generated based on the power generation status. The first calculation unit calculates the amount of the third power based on the prediction result from the first prediction unit and the status of the second power stored in the energy storage system.

[0128] (Note 3) According to the power management device described in Appendix 1 or Appendix 2, the power generation status includes time-series data of the power generation of one or more power generation systems that generate the first power. The status of the second power includes time-series information on the charging and discharging of one or more energy storage systems storing the first power, or time-series data on the stored capacity.

[0129] (Note 4) The power management device according to any one of Annexes 1 to 3 has a second forecasting unit that forecasts the user's power demand based on the user's demand status. The second calculation unit calculates the amount of electricity supplied to the user based on the prediction results from the second prediction unit and the user's contract information.

[0130] (Note 5) According to the power management device described in Appendix 4, the demand status includes time-series data representing the power consumption of one or more users. The contract information includes at least one of the following: contracted electricity volume, contracted unit price, and proportion of renewable energy.

[0131] (Note 6) According to any one of the appendices 1 to 5, the decision-making unit further determines the amount of electricity to be traded in the electricity market based on electricity price information in the electricity market.

[0132] (Note 7) According to any one of Appendix 1 to Appendix 6, the decision unit further determines the amount of the first power stored in the energy storage system.

[0133] (Note 8) According to the power management device described in Appendix 7, the decision-making unit further determines, based on the power price information in the power market, the amount of electricity to be traded in the power market and the amount of the first power stored in the energy storage system.

[0134] (Note 9) According to the power management device described in Appendix 7 or Appendix 8, the decision unit Calculate the amount of remaining or insufficient fourth power based on the amount of the third power and the required power. During the remaining time period of the fourth electricity, the fourth electricity will be stored in the energy storage system during periods when the market price of electricity is below a specified threshold.

[0135] (Postscript 10) The power management device according to any one of Appendix 7 to Appendix 9 has a charge and discharge control unit that controls the charging and discharging of the energy storage system based on the amount of electricity traded in the electricity market, the amount of electricity traded with the user, or the amount of the first power stored in the energy storage system as determined by the decision unit.

[0136] (Postscript 11) According to the power management device described in Appendix 7, the decision unit further determines the amount of the first power supplied to the hydrogen production device that uses the power to generate hydrogen, or the organic hydride manufacturing device that uses the power to generate organic hydrides.

[0137] (Postscript 12) According to the power management device described in Appendix 11, the third type of power that can be supplied includes power generated by the hydrogen or the organic hydride.

[0138] (Postscript 13) The power management device according to Appendix 12 has a certificate management department that manages certificates for the electricity generated from the renewable energy source. When the actual generation of the first type of electricity using the renewable energy exceeds the actual supply of the first type of electricity, the certificate management department will trade the certificate for the difference between the generation and supply of the first type of electricity in the electricity market.

[0139] (Postscript 14) A power management system comprising an energy storage system and a power management device. The power management device has, The first calculation unit calculates the amount of third electricity that can be supplied, based on the power generation status of the first electricity generated using renewable energy and the status of the second electricity obtained by storing the first electricity in the energy storage system. The second calculation unit calculates the amount of electricity to be supplied to the user based on the user's demand information, and The decision-making department, based on the amount of electricity supplied to the user, determines the amount of the third electricity that will be traded in the electricity market and the amount that will not be traded bilaterally with the user through the electricity market.

[0140] (Postscript 15) A power management method in which a computer performs the following processes: The process of calculating the amount of available third electricity based on the generation status of the first type of electricity using renewable energy and the status of the second type of electricity obtained by storing the first type of electricity in an energy storage system. The process of calculating the amount of electricity to be supplied to the user based on the user's demand information. Based on the amount of electricity supplied to the user, the processing of the third type of electricity is determined, including the amount traded in the electricity market and the amount traded bilaterally with the user without going through the electricity market.

[0141] (Postscript 16) A storage medium for a program or stored program, wherein a computer is made to execute the power management method of Appendix 15.

[0142] The embodiments of the present invention have been described in detail above, but the embodiments disclosed herein are illustrative and not restrictive in all respects. Various modifications and alterations can be made to the embodiments without departing from the scope and spirit of the appended claims. The matters described in the foregoing embodiments may be employed in other structures and combinations thereof, without contradiction.

[0143] This application claims priority to basic application No. 2024-049863 filed with the Japan Patent Office on March 26, 2024, the entire contents of which are incorporated herein by reference.

[0144] [Attached image labels] 10. Power Generation System 20 users 21 User System 30. Electricity Market 31. Electricity Market System 100 Power Management System 110 Power Management Device 120 energy storage system 402 Power Generation Forecasting Department (First Forecasting Department) 403 Available to the Power Calculation Department (First Calculation Department) 404 Demand Electricity Forecasting Department (Second Forecasting Department) 405 Power Supply Calculation Department (Second Calculation Department) 406 Decision Department 407 Charge / Discharge Control Unit 408 Supply Performance Management Department 409 Certificate Management Department 410 Transaction Management Department

Claims

1. A power management device, comprising: The first calculation unit calculates the amount of third electricity that can be supplied, based on the power generation status of the first electricity generated using renewable energy sources and the status of the second electricity obtained by storing the first electricity in an energy storage system. The second calculation unit calculates the amount of electricity to be supplied to the user based on the user's demand information. The decision-making department, based on the amount of electricity supplied to the user, determines the amount of the third electricity that is traded in the electricity market and the amount that is traded bilaterally with the user without going through the electricity market.

2. The power management device according to claim 1, comprising a first prediction unit that predicts the power generation amount of the first power based on the power generation status. The first calculation unit calculates the amount of the third power based on the prediction result from the first prediction unit and the status of the second power stored in the energy storage system.

3. The power management device according to claim 2, wherein the power generation status includes time-series data of the power generation of one or more power generation systems that generate the first power. The status of the second power includes time-series information on the charging and discharging of one or more energy storage systems storing the first power, or time-series data on the stored capacity.

4. The power management device according to claim 1 or 2, comprising a second prediction unit that predicts the user's power demand based on the user's demand status. The second calculation unit calculates the amount of electricity supplied to the user based on the prediction results from the second prediction unit and the user's contract information.

5. The power management device according to claim 4, wherein the demand status includes time-series data representing the power consumption of one or more users. The contract information includes at least one of the following: contracted electricity volume, contracted unit price, and proportion of renewable energy.

6. The power management device according to claim 1, wherein the decision unit further determines the amount of electricity to be traded in the power market based on the electricity price information in the power market.

7. The power management device according to claim 1, wherein the decision unit further determines the amount of the first power stored in the energy storage system.

8. The power management device according to claim 7, wherein the decision unit further determines, based on power price information in the power market, the amount of electricity to be traded in the power market and the amount of the first power stored in the energy storage system.

9. The power management device according to claim 7, wherein the decision unit calculates the amount of remaining or insufficient fourth power based on the amount of the third power and the required power. During the remaining time period of the fourth electricity, the fourth electricity will be stored in the energy storage system during periods when the market price of electricity is below a specified threshold.

10. The power management device according to any one of claims 7 to 9, comprising a charge-discharge control unit that controls the charging and discharging of the energy storage system based on the amount of electricity traded in the electricity market, the amount of electricity traded with the user, or the amount of the first power stored in the energy storage system as determined by the decision unit.

11. The power management device according to claim 1, wherein the decision unit further determines the amount of the first power supplied to a hydrogen production device that uses the power to generate hydrogen, or an organic hydride manufacturing device that uses the power to generate organic hydrides.

12. The power management device according to claim 11, wherein the third power that can be supplied includes power generated by the hydrogen or the organic hydride.

13. The power management device according to claim 1, comprising a certificate management unit for managing certificates for the electricity based on the renewable energy source. When the actual generation of the first type of electricity using the renewable energy exceeds the actual supply of the first type of electricity, the certificate management department will trade the certificate for the difference between the generation and supply of the first type of electricity in the electricity market.

14. A power management system comprising an energy storage system and a power management device, The power management device has: The first calculation unit calculates the amount of third electricity that can be supplied, based on the power generation status of the first electricity generated using renewable energy and the status of the second electricity obtained by storing the first electricity in the energy storage system. The second calculation unit calculates the amount of electricity to be supplied to the user based on the user's demand information, and The decision-making department, based on the amount of electricity supplied to the user, determines the amount of the third electricity that is traded in the electricity market and the amount that is traded bilaterally with the user without going through the electricity market.

15. A power management method, wherein, The computer performs the following processing: The process of calculating the amount of available third electricity based on the generation status of the first type of electricity using renewable energy and the status of the second type of electricity obtained by storing the first type of electricity in an energy storage system. The process of calculating the amount of electricity to be supplied to the user based on the user's demand information. Based on the amount of electricity supplied to the user, the processing of the third type of electricity is determined, including the amount traded in the electricity market and the amount traded bilaterally with the user without going through the electricity market.

Images