Power operation system

Abstract

To provide a power operation system that maximizes a profit in operation of power in a power relative transaction and power market transaction.SOLUTION: A power operation system has a control unit including: one or more acquisition units selected out of a state acquisition unit for acquiring various states of a storage battery such as the storage battery's charging rate, capacity deterioration state, and battery temperature, a power sale price acquisition unit for acquiring a power sale price prediction value, an imbalance rate acquisition unit for acquiring an imbalance rate prediction value, a power generation amount acquisition unit for acquiring a power generation amount prediction value, and a power demand amount acquisition unit for acquiring a power demand amount prediction value; a plan creation unit that on the basis of some or all of the acquired state of storage battery and power generation equipment or power consumption equipment, power sale price, imbalance rate, power generation amount and power demand amount prediction value, creates one or more selected from a storage battery charging / discharging plan, power generation sales plan, and power generation procurement plan that maximize a power operation profit; and a storage unit that stores a constraint condition constraining operation of the storage battery and an avoidance measure for the constraint.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a power operation system. [Background technology]

[0002] Conventionally, in power generation methods that are easily affected by weather conditions, such as solar power generation and wind power generation, attempts have been made to buy and sell electricity in accordance with hourly fluctuations in the amount of power generated.

[0003] Patent Document 1 describes an electricity management system that creates a power generation plan based on electricity demand forecast data created from individual electricity demand information on the electricity demand side and weather information, as well as a bidding plan based on the power generation plan and an expected exchange price that is assumed for the bidding conditions and settlement price at the electricity exchange. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-303411 A Summary of the Invention [Problem to be solved by the invention]

[0005] Although the conventional technology creates a power generation plan and a bidding plan, it does not suggest maximizing profits by optimizing power operations such as power generation, consumption, purchase and sale, and storage by using the prediction of power purchase and sale prices in the power trading market and the characteristics of storage batteries. In particular, due to the change over time in the charging and discharging capacity based on the characteristics of storage batteries, there have been cases where opportunities to make profits in bilateral power transactions and power market transactions have been missed.

[0006] The present invention provides an electricity operation system that maximizes profits in bilateral electricity transactions and electricity operation in electricity market transactions, based on predictions of fluctuations in electricity buying and selling prices in the electricity trading market, changes in the charging and discharging performance of storage batteries, and operational constraints. [Means for solving the problem]

[0007] A power operation system according to one embodiment of the present invention comprises: a state acquisition unit that acquires a current state and a predicted future state of the storage battery, including at least one of the state of charge (SOC), state of health (SOH), and battery temperature of the storage battery, and a current state and a predicted future state of a power generation facility or a power consumption facility; an electricity trading price acquisition unit for acquiring a predicted value of a future electricity trading price in the electricity trading market; an imbalance fee acquisition unit that acquires a future imbalance fee predicted value; a power generation amount acquiring unit for acquiring a predicted value of a future power generation amount; and a power demand acquiring unit for acquiring a predicted value of a future power demand amount; and one or more acquisition units selected from a plan creation unit that creates all or part of a charge / discharge plan, a power generation sales plan, and a demand procurement plan for the storage battery that maximizes the power operation profit based on all or part of the current state and future state prediction of the storage battery, the current state and future state prediction of the power generation equipment or the power consumption equipment, the power purchase and sale price prediction value, the imbalance fee prediction value, the power generation amount prediction value, and the power demand amount prediction value acquired by the selected acquisition unit; A storage unit that stores constraint conditions that restrict operation of the storage battery and measures to avoid the constraints; has.

[0008] According to the present invention, the current and future state of the storage battery and the state of other power generation equipment or power consumption equipment, future electricity buying and selling prices and imbalance charges, and information that will affect the amount of electricity generated and the amount of electricity demand are obtained, and based on that information, a storage battery charging and discharging plan, an electricity generation and sales plan, and a demand procurement plan (hereinafter referred to as "electricity operation plans" in this specification) are created, thereby maximizing the user's profits from electricity operations.

[0009] In addition, the power operation system according to one aspect of the present invention further includes: A determination unit that determines an area in which the created charge / discharge plan, power generation / sales plan, and demand procurement plan need to be changed based on the stored constraint conditions; In the section determined by the determination unit, The revenue from electricity operations when changes are made to the charging and discharging plan, the power generation and sales plan, and the demand procurement plan, The power operating profit when measures to avoid the constraints are implemented, and The power operation profit when the charging / discharging plan, the power generation / sales plan, and the demand procurement plan are changed and measures to avoid the constraints are implemented, A calculation and comparison unit that calculates and compares two or more selected from a plan determination unit that changes the charge / discharge plan, the power generation / sales plan, and the demand procurement plan or implements measures to avoid constraint conditions based on the comparison result of the calculation / comparison unit; has. According to the present invention, even if circumstances (constraints) that affect electricity trading arise or are predicted to arise after the plan is created, the impact on the user's electricity operation profits can be reduced and profits can be maximized by comparing the electricity operation profits based on the newly created revised plan with the electricity operation profits when measures are implemented to avoid the constraints, and the electricity operation profits when both are implemented.

[0010] In one aspect of the power operation system of the present invention, The constraints include the duration of charging and discharging due to temperature changes in the storage battery, the upper and lower limit temperatures at which charging and discharging are stopped, the amount of current during charging and discharging, and the upper and lower limits of the SOC. According to the present invention, by creating a charging / discharging plan, a power generation / sales plan, and a demand procurement plan taking into account constraints on the use of the storage battery, the plans can be made to reflect actual conditions.

[0011] In one aspect of the power operation system of the present invention, Avoidance measures include adjusting the charge / discharge rate of the battery, cooling or heating the battery. According to the present invention, by implementing measures to avoid constraints on the use of a storage battery, it is possible to increase the degree of freedom in operating the storage battery.

[0012] In one aspect of the power operation system of the present invention, The power operating revenue can be calculated using one or more selected from the cost of electricity associated with the implementation of the avoidance measures, the cost of electricity used for auxiliary equipment installed in the storage battery, the cost of electricity used for auxiliary equipment installed in the power generation facility, and the imbalance cost. According to the present invention, by calculating the power operating profit taking into account the costs incurred in measures to avoid the constraints on the use of storage batteries, it becomes possible to calculate a power operating profit that is more in line with reality and to perform optimization calculations to maximize profits. Effect of the Invention

[0013] According to the power operation system of the present invention, the power operation plan is optimized based on the current and future states of the storage battery, the states and predictions of other power generation facilities or power consumption facilities, the predicted value of the power buying and selling price in the power trading market, the predicted value of the imbalance charge, the predicted value of the power generation amount, and the predicted value of the power demand amount, and the equipment required for power usage, the storage battery, and the equipment associated with the storage battery, etc., thereby maximizing the power operation profit of the user. Even if a circumstance (constraint condition) that affects the power buying and selling occurs after the plan is created, the impact on the power operation profit of the user can be suppressed and the power operation profit can be maximized by comparing the power operation profit based on the newly created revised plan with the power operation profit when measures to avoid the constraint condition are implemented, and the power operation profit when both are implemented. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing an embodiment of a system configuration of a power operation system of the present invention; [Diagram 2] FIG. 1 is a schematic diagram illustrating an embodiment of hardware constituting a power operation system of the present invention. [Diagram 3] 1 is a schematic diagram showing an embodiment of the relationship between the power operation system of the present invention, resources including power generation facilities, demand facilities, storage batteries, etc., and electricity buyers such as various electricity trading markets and electricity retailers. [Figure 4]FIG. 4 is a block diagram showing functions executed in a control unit. [Diagram 5] 1 is a graph showing the relationship between the state of charge (SOC) and the spot market price when a storage battery is used for a certain period of time. [Figure 6] 4 is a flowchart showing the creation and execution of a power operation plan including a charge / discharge plan, a power generation / sales plan, and a demand procurement plan in the power operation system of the present invention. [Figure 7A] FIG. 3 is a diagram showing the relationship between the charge / discharge elapsed time and the SOC of the storage battery in the first embodiment of the present invention. [Figure 7B] FIG. 3 is a diagram showing the relationship between the charge / discharge elapsed time and the SOC of the storage battery in the first embodiment of the present invention. [Figure 8] FIG. 11 is a diagram showing the relationship between the charge / discharge elapsed time and the SOC of a storage battery in accordance with the second embodiment of the present invention. [Figure 9] FIG. 11 is a diagram showing the relationship between the charge / discharge elapsed time and the SOC of a storage battery in accordance with a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The power operation system of the present invention will be described below.

[0016] [1. Overall structure] FIG. 1 shows an embodiment of the overall system configuration of a power operation system according to the present invention. In the power operation system of the present invention in FIG. 1, a management server 1 managed by a system administrator, a user usage server 2 used by a user of the power operation system, and an external organization server 3 are connected to each other so as to be able to communicate with each other via a network NW. The form of the network NW is not particularly limited, and for example, Bluetooth (registered trademark), Wi-Fi, LAN (Local Area Network), the Internet, etc. can be adopted. The user usage server 2 is connected to a user terminal such as a smartphone, a tablet PC, or a desktop PC, and the user operates the user terminal to connect to the network NW and perform data communication with other devices. The external organization server 3 is a server other than the management server 1 and the user usage server 2, which exchanges information with the power operation system of the invention, and includes servers owned by OCCTO and JPEX, and servers that manage power generation facilities.

[0017] [1.1 Hardware configuration of the power operation system] Next, the hardware configuration of the power operation system of the present invention will be described. Fig. 2 is a schematic diagram of the hardware constituting the power operation system of the present invention (power operation system 20). As shown in Fig. 2, this system includes a control unit 210, an input unit 220, a storage device 230, a display unit 240, a communication unit 250, and an output unit 260, which are connected via a system bus 270.

[0018] In FIG. 2, the control unit 210 is, for example, a processor such as a CPU, and executes a program in which the processing in the power operation system 20 is described. The input unit 220 is, for example, composed of a keyboard, a mouse, etc., and is used by a user of the computer system to input various information. The storage device 230 includes various memories such as a RAM (Random Access Memory) and a ROM (Read Only Memory), as well as storage devices such as a hard disk and an SSD, and stores application programs to be executed by the control unit 210 and necessary data obtained in the process of processing. The storage device 230 may also be used as a temporary storage area during program execution. The display unit 240 is composed of a display, an LCD (liquid crystal display panel), etc., and displays various screens to the user. The communication unit 250 is a receiver and a transmitter that perform communication processing. The output unit 260 is, for example, a printer. Note that FIG. 2 is just an example, and the hardware configuration of power operation system 20 is not limited to the example of FIG.

[0019] Here, an example of the operation until an application program for executing the functions of power operation system 20 is in an executable state will be described. For example, the application program is downloaded from a CD-ROM or DVD-ROM set in a CD (Compact Disc)-ROM drive or DVD (Digital Versatile Disc)-ROM drive (not shown), or downloaded via a transmission medium such as the Internet via communication unit 250, and then installed in power operation system 20 having the above-mentioned configuration. When the application program is executed, the program is started from storage device 230. In this state, control unit 210 executes the functions of power operation system 20 according to the application program started from storage device 230.

[0020] The application programs for executing the functions of power operation system 20 do not necessarily need to be stored in storage device 230, and may be stored in, for example, an external storage device and executed by accessing via a network. When executing the functions of power operation system 20 via a network, the system may be designed to require the user to input a user ID, a password, or the like.

[0021] FIG. 3 is a schematic diagram showing the relationship between the power operation system of the present invention, resources including power generation facilities, demand facilities, storage batteries, etc., and electricity buyers such as various electricity trading markets and electricity retailers.

[0022] [1.2 Exchange of information with external organizations, etc.] In order to create a power operation plan including a charge / discharge plan, a power generation sales plan, and a demand procurement plan, the power operation system 20 communicates data with each power generation facility, power generation business operators, power generation contractors, power consumption facilities, consumers, storage batteries, aggregators, the power trading market, retail electricity business operators, the Agency for Cross-regional Coordination of Electricity Generation, external organizations including information senders, and users of the power operation system 20 via a network NW. The data communication is performed by a communication unit 250.

[0023] [1.2.1 Information exchange with external facilities, etc.] The power operation system 20 acquires information from the power generation equipment, such as the amount of power generated in each time period, whether or not output suppression is performed, whether or not equipment is broken, and the operation status. In this specification, the equipment refers to power generation equipment such as solar power generation, wind power generation, hydroelectric power generation, geothermal power generation, biomass power generation, thermal power generation, and nuclear power generation. The power operation system 20 also acquires information from the power consumption equipment, such as the amount of power demand in each time period, whether or not an energy management system is present in the power consumption equipment and control instructions from the system, and whether or not equipment is broken. Furthermore, the power operation system 20 also acquires information related to the amount of power charged in the storage battery and the operation status. In addition to the information acquired from each equipment, the power generation equipment, the power consumption equipment, and the storage battery also acquire information on predicted values.

[0024] The power generation equipment and the storage battery may be installed, for example, on the premises of a specific consumer. In this case, the power operation system 20 can acquire information related to power generation, such as the amount of power generated by the power generation equipment, the power generation time, and the power generation efficiency, and information related to the state of the storage battery, such as the temperature state of the storage battery including the temperature of each cell, the SOC (State of Charge), the number of cycles elapsed, the degree of deterioration, and the SOH (State of Health), based on time-series information detected by a sensor installed in the power generation equipment. The control unit 210 (state acquisition unit 2102) exchanges information between the power operation system 20 and the external equipment, and the acquired information is stored in the storage device 230.

[0025] [1.2.2 Information exchange with electricity purchasers and sellers] The generation sales plan and demand procurement plan are submitted to the OCCTO.

[0026] The power operation system 20 must submit to OCCTO, as a power generation and sales plan or a demand procurement plan, a plan for the next day, created for every 48 frames in 30-minute units, by 12:00 on the day before the power supply and demand day. In addition, after the submission of the plan for the next day, in order to respond to changes in information related to power supply and demand, the submitted plan may be changed and a new plan (for the day) may be submitted by the gate closing time (one hour before the actual supply and demand). In addition, when selling (discharging) the power charged in the storage battery, or when purchasing and charging power from the grid to function as a grid storage battery, bidding is conducted for buying and selling at JPEX or the like. For these, the optimal bidding market, bidding conditions, bidding timing, bidding amount, and bidding method must be selected for each 30-minute unit, and the plan creation unit 2107 in the power operation system 20 creates a power operation plan that maximizes the power generation company's power operation profits by taking these conditions into consideration, and submits the plan automatically or manually. Information is exchanged between the power operation system 20 and JPEX or the like by the control unit 210, and the transmitted and acquired information is stored in the storage device 230. Note that the timing of plan creation and the number of frames per day are merely examples, and are not limited to these.

[0027] The power operation system 20 also exchanges information with power buyers and sellers. The power buyers and sellers include a spot market 41, an hourly market 42, a supply and demand adjustment market 43, a capacity market 44, a retail electricity supplier 45 that supplies power based on a bilateral contract, and other power buyers 46 including general electricity transmission and distribution companies. Exchanges with the power buyers and sellers, such as transaction price information in each market and information related to power buying and selling with the retail electricity supplier 45, are performed using the communication unit 250 by data communication via the network NW between each external institution server 3 that manages the power buyers and sellers.

[0028] [1.2.3 Information exchange with information senders] In addition to information on power generation equipment 31, 32, 33, power consumption equipment 34, 35, and storage battery 36 acquired by the status acquisition unit 2102, the power operation system 20 acquires information necessary for creating a power operation plan, including a charge / discharge plan, a power generation and sales plan, and a demand procurement plan, from an external information sender 50. The information acquired from these information senders 50 includes meteorological information 51 acquired from a weather company, power plant accidents and outages, power usage restriction activation record information, planned power outage activation record information, power generation facility information 52 related to calculation indexes used to calculate correction charges, current information 53 related to accidents and the economy, power system utilization wide-area reserve margin information 54 published by the Organization for Cross-area Power Co., Inc. (OCCTO) 47, power market information 55 related to imbalance charges, imbalance amounts, trading information in the spot market 41, trading information in the time-ahead market 42, trading information in the supply and demand adjustment market 43, trading information in the capacity market 44, and other current information, but is not limited to these as long as it is information that can affect power operation plans including charging and discharging plans, power generation sales plans, and demand procurement plans. The power operation system 20 acquires information from these information senders 50 by the status acquisition unit 2102 using data communication via the network NW. Information is exchanged between power operation system 20 and information sender 50 by control unit 210 , and the acquired information is stored in storage device 230 .

[0029] [1.2.4 Submission of plan to OCCTO] Contractors and power generation contractors submit power generation sales plans or demand procurement plans to OCCTO 47. To this end, users submit power generation sales plans or demand procurement plans and exchange other information by data communication via a network NW between the management server 1 of this plan creation system and the external agency server 3 owned by OCCTO 47.

[0030] In this specification, consumers include, but are not limited to, public facilities such as schools, government offices, and hospitals, manufacturer factories, commercial facilities such as supermarkets, stores, corporate offices, residential facilities, logistics facilities, and disaster prevention base facilities. In addition, in recent years, balancing groups (hereinafter referred to as BGs) have been used as groups of businesses that settle imbalances in electricity trading, and power generation BGs, which are BGs formed by power generation contractors, and their members, and demand BGs, which are BGs formed by retail electricity suppliers, etc., and their members are also assumed to be users of the power operation system 20.

[0031] Electricity trading markets include, for example, a spot market 41, an hourly market 42, a supply and demand adjustment market 43, and a capacity market 44. Electricity trading is carried out by computer, and businesses participating in trading submit bids via the Internet or the like. When participating in trading in the electricity trading market, businesses formulate a power generation sales plan, a demand procurement plan, and a bidding plan, including the selection of a market in which to bid, taking into consideration the amount of power generated, the amount of power demanded, the cost required for power generation, the cost required for power supply, the cost required for controlling the storage battery, the maximum output of the generator, the contracted power, and the market price.

[0032] The storage battery 36 may be used as a renewable energy storage battery that temporarily stores the power supplied from a power generation facility using renewable energy, or may be used as a system storage battery that buys and sells power to the system, but is not limited to these. For example, the storage battery 36 may be installed for the purpose of increasing profits by selling surplus power, which is obtained by subtracting the power demand described below from the power supplied from the power generation facility using renewable energy, during a time period when the market price of JPEX is high. Alternatively, the storage battery 36 may be installed for the purpose of using the storage battery as a means of covering the power demand during a time period when the amount of power supplied from the power generation facility using renewable energy decreases. In addition, the storage battery 36 may purchase electricity in advance from the spot market 41 and store it in preparation for the case where the amount of electricity generated by the power generation equipment (solar power) 31 does not meet the electricity demand of the power consumption equipment (motor) 34, the power consumption equipment (lights) 35, etc. As the storage battery 36, a known storage battery such as a NAS battery, a redox flow battery, or a lithium ion battery may be used, or a storage battery that will be newly developed and provided in the future may be used. In order to avoid operational restrictions on the storage battery due to heat generation or absorption during charging and discharging, and to avoid deterioration of the storage battery, a device for extending the life of the storage battery may be installed, a temperature adjustment function such as a cooling fan or a heater may be provided, or an auxiliary device having a temperature adjustment function may be installed.

[0033] [2. Functions of the Power Operation System] Next, the configuration of control unit 210 in power operation system 20 will be described. Fig. 4 is a block diagram showing functions executed by control unit 210. As described above, power operation system 20 includes control unit 210 that starts and controls application programs for realizing each function, and storage device 230 that stores application programs and data. Functions executed by control unit 210 include an acquisition unit 2101, a plan creation unit 2107, a determination unit 2108, a calculation and comparison unit 2109, a plan determination unit 2110, and a storage unit 2111.

[0034] The acquisition unit 2101 is a function for acquiring information for creating plans such as a charge / discharge plan, a power generation / sales plan, and a demand procurement plan, and includes, but is not limited to, one or more selected from a state acquisition unit 2102, a power buying / selling price acquisition unit 2103, an imbalance fee acquisition unit 2104, a power generation amount acquisition unit 2105, and a power demand amount acquisition unit 2106, which will be described later. Furthermore, in this specification, when there is no need to distinguish between the state acquisition unit 2102, the power buying / selling price acquisition unit 2103, the imbalance fee acquisition unit 2104, the power generation amount acquisition unit 2105, and the power demand amount acquisition unit 2106, which will be described later, they may be simply referred to as the acquisition unit 2101.

[0035] The status acquisition unit 2102 acquires information on the current status and future status prediction (including information used to predict the future status of the hardware) of the hardware required for power operation by the power operation system 20. In particular, information on the power generation equipment (photovoltaic) 31, the power generation equipment (wind) 32, the power generation equipment (other) 33, the power consumption equipment (motor) 34, the power consumption equipment (lights) 35, the storage battery 36, and other resources 37 is acquired. The information on the power generation facilities 31, 32, and 33 includes information on deterioration or failure of each generator in the facilities, information on suspension due to maintenance, etc., and information required to predict current or future total power generation amount, power generation efficiency, power generation time, etc. may be acquired. This information may be acquired from sensors installed in the power generation facilities 31, 32, and 33. The information on the power consumption equipment 34, 35 includes operation information of each power consumption equipment within the facility, information on deterioration and failure, information on suspension due to maintenance, etc., and obtains information necessary to predict current or future total power demand, power consumption time, etc.

[0036] The information on the storage battery 36 is information for grasping the charging and discharging capacity of the storage battery 36, and includes, for example, the temperature of the storage battery 36, the state of charge (SOC), the state of health (SOH), the presence or absence of a malfunction, the number of charges and discharges since the start of operation, the operation history, the charge and discharge efficiency including the PCS efficiency, the response speed, the required auxiliary power amount, and other information on the current state and prediction of the future state of the storage battery, which is acquired as information necessary for formulating a future charge and discharge plan for the storage battery. Such information may be acquired from a sensor installed in the storage battery 36.

[0037] The information acquired by the status acquisition unit 2102 is not limited to information on the power generation facilities 31, 32, and 33, the power consumption facilities 34 and 35, and the storage battery 36, but also includes hardware information that may affect the processing of the power operation system 20, such as the deterioration state of the power transmission facility. Furthermore, the information acquired by the status acquisition unit 2102 is not limited to actual values ​​such as the deterioration state of the power generation facilities 31, 32, and 33 and the charge / discharge capacity of the storage battery 36, but may be predicted values ​​for the future. The timing of acquiring the information may be as design data when the operation of the power operation system 20 starts, or as real-time data at the end of operation or during operation.

[0038] The storage unit 2111 executes a function of storing, in the storage device 230, information that affects the processing of the power operation system 20, in addition to the information acquired by the status acquisition unit 2102. In particular, the storage unit 2111 also stores, in the storage device 230, constraint conditions that affect the operation of the storage battery 36 used in the power operation system 20 and methods of measures to avoid the constraints. Here, the constraint conditions that affect the operation of the storage battery 36 include an optimum operating temperature range in which charging and discharging are stopped due to temperature changes during charging and discharging, a current amount range for safely performing charging and discharging, and upper and lower SOC limits for preventing deterioration of the storage battery 36.

[0039] The power buying and selling price acquisition unit 2103 acquires a predicted value of the power buying and selling price in the power trading market. For example, the power buying and selling price acquisition unit 2103 may calculate a predicted value of the power buying and selling price in the power trading market, or may acquire a predicted value of the power buying and selling price from an external institution or a contractor. In addition, when multiple trading markets such as the spot market 41 and the time-ahead market 42 must be considered, a predicted value of the market price for each trading market is acquired. The method of predicting the power buying and selling price in the power trading market is not particularly limited, and a known method can be used. For example, the power buying and selling price may be predicted based on past performance information, weather information, calendar information, etc. in the target area, or may be calculated using a learned model that has been trained to learn the relationship between these information and past performance values ​​of the power buying and selling prices as teacher data.

[0040] The imbalance fee acquisition unit 2104 acquires a predicted value of the future imbalance fee. The imbalance fee acquisition unit 2104 may calculate the predicted value of the imbalance fee, or may acquire the predicted value of the imbalance fee by receiving it from, for example, an external organization or a contractor. The method of predicting the imbalance fee is not particularly limited, and a known method can be used. For example, the imbalance fee may be predicted based on past performance information, weather information, calendar information, etc. in the target area, or the imbalance fee may be calculated using a trained model that has been trained on the relationship between these information and past actual imbalance fee values ​​as training data.

[0041] The power generation amount acquisition unit 2105 predicts the amount of power generation and the time of power generation in solar, wind, hydroelectric, or other facilities or areas capable of generating power based on the operation plan and weather information of the power generation facility. The power generation amount acquisition unit 2105 may, for example, calculate a predicted value of the amount of power generation, or may acquire a predicted value of the amount of power generation from, for example, an external organization or a contractor. For example, in the case of solar power generation, the amount of power generation and the time of power generation of the solar power generation facility can be predicted based on the amount of solar radiation, the hours of sunshine, the power generation efficiency of the solar power generation device, and the like based on the weather forecast information of the area where the solar power generator is installed. The power generation efficiency of the solar power generation facility also varies depending on factors such as aging deterioration of the solar panel used, dirt, and the angle of the panel, so it may be calculated using a predetermined calculation formula weighted for each of these factors. Alternatively, it may be calculated using a learned model in which the relationship between the factors and past power generation results values ​​are learned as teacher data. Also, in the case of wind power generation, the meteorological information used for prediction is wind speed and direction, etc., while in the case of hydroelectric power generation, it is rainfall, etc., but otherwise they are similar and therefore description will be omitted.

[0042] The power demand acquisition unit 2106 predicts the power demand of a specific consumer or within an area. In this case, the power demand can be calculated based on information on the characteristics of the consumer or consumers located in the area (factories, stores, hospitals, schools, offices, etc.) and factors that affect the demand (such as characteristics of major machines in factories), as well as information on the operation plans of these consumers (production plans in factories, business schedules in stores, etc.). Furthermore, factors that affect the power demand may include forecast information on the weather (e.g., weather, temperature, humidity) at the point where the demand occurs. The power demand acquisition unit 2106 may, for example, calculate a forecast value of the power demand, or may obtain a forecast value of the amount of power generated from, for example, an external agency or a contractor. The method of predicting the power demand is not particularly limited, and known methods can be used. For example, the power demand may be predicted based on past performance information, weather information, calendar information, etc. in the target area, or the power demand may be calculated using a trained model that has been trained on the relationship between these information and past power demand performance values ​​as teacher data.

[0043] The power demand acquisition unit 2106 can include, as the power demand, the power for operating the power generation equipment 31, 32, 33 and the storage battery 36, the power for adjusting the charge / discharge amount of the storage battery 36, and the amount of power used to operate cooling accessories (e.g., air-cooled fans) or heating accessories (e.g., heaters) for maintaining the temperature of the storage battery 36 within the optimum operating temperature range.

[0044] The plan creation unit 2107 creates an electric power operation plan so as to maximize the user's electric power operation profit based on some or all of the current state and future state prediction of the storage battery 36, the current state and future state prediction of the power generation equipment or the power consumption equipment (including the auxiliary equipment used for cooling or heating the storage battery), the acquired electric power buying and selling price prediction value, the imbalance charge prediction value, the power generation prediction value, and the power demand prediction value. Note that, during the operation of the power generation equipment 31, 32, and 33, if the power generation prediction value and the actual value in the initially created electric power operation plan become significantly different or are predicted to become significantly different, if the power demand prediction value and the actual value become significantly different or are predicted to become significantly different, if the transaction price in the electric power trading market changes significantly or are predicted to change significantly, or if cooling of the storage battery 36 becomes necessary to maintain the initial electric power operation plan, the plan creation unit 2107 may be capable of changing the electric power operation plan at any time. The electric power operation plan may be automatically updated based on preset conditions, and it is preferable that the automatic update can be stopped and the electric power operation plan can be changed manually at the user's will. Furthermore, when an instruction to create a revised operation plan is given by the determining unit 2108 described below, the plan creating unit 2107 creates a revised operation plan for the section instructed by the determining unit 2108 .

[0045] The determination unit 2108 determines an interval for which a change in the power operation plan created by the plan creation unit 2107 is required, based on the constraint conditions of the storage battery 36 stored in the memory device 230. For example, when the temperature of the storage battery 36 deviates from the operating temperature range, it determines that a revised operation plan needs to be created.

[0046] FIG. 5 shows the relationship between the SOC of the storage battery 36 and the spot market price when a conventional storage battery is used for a certain period of time. When selling (discharging) surplus power charged in the storage battery 36, it is preferable to sell the power when the spot market price is high. In the example of FIG. 5, the SOC curves downwards at 8 hours, 48 ​​hours, and 70 hours after the start of operation, which are circled in the figure (switching from discharging to charging). Since the spot market price remains relatively high in these time periods compared to the surrounding time periods, it is preferable to sell as much power as possible, but in both cases, the SOC switches to charging at around 40%. This is because the discharge is restricted for safety reasons due to the rise in the temperature of the storage battery 36, and the discharge is automatically changed to pause or charging, which means that an opportunity to sell power when the spot market price is high is missed. In response to this, the power operation system 20 cools the storage battery 36 with a cooling fan installed in the storage battery 36, thereby lowering the lower limit of SOC during discharge to below around 40%, making it possible to sell power when the spot market price is high. The cooling is not limited to the time period in which the temperature constraint is violated, and cooling may be started (pre-cooling) prior to the time period in which the temperature constraint is expected to be violated in the future.

[0047] If it is predicted based on past performance data that the temperature of the storage battery 36 will exceed the upper limit of the operating temperature due to discharging, in order to prevent the temperature of the storage battery 36 from rising further due to discharging, the determination unit 2108 reviews the power operation plan to change, limit or suppress the operation pattern of the storage battery 36, and determines whether or not it is necessary to take measures such as canceling the discharge of the storage battery 36, reducing the amount of discharge of the storage battery 36, or dividing the discharge of the storage battery 36. The same applies when it is predicted that the temperature of the storage battery 36 will exceed the lower limit of the operating temperature.

[0048] Constraints on the storage battery 36 include a rise or fall in temperature of the storage battery 36, a degree of deterioration of the storage battery 36, and a lack of capacity of the storage battery 36. Furthermore, the constraints are not limited to the storage battery 36, but also include operational constraints on power transmission equipment and power generation equipment.

[0049] The determining unit 2108 instructs the plan creating unit 2107 to create a revised operation plan by changing the original power operation plan for the section for which it is determined that the power operation plan needs to be changed.

[0050] The calculation / comparison unit 2109 calculates and compares two or more selected from the power operation profit when the power operation plan is changed, the power operation profit when measures to avoid the constraints are implemented and the original power operation plan is maintained, and the power operation profit when measures to avoid the constraints are implemented and the original power operation plan is also changed, in the section determined by the determination unit 2108. Note that this power operation profit may be a profit that takes into account the cost of the amount of power used to cool or heat the storage battery, other auxiliary power costs, imbalance costs, etc., as described above.

[0051] The plan determination unit 2110 changes the power operation plan and / or implements measures to avoid the constraint conditions based on the comparison result of the calculation and comparison unit 2109. The decision on whether or not to change the power operation plan may be made automatically based on predetermined conditions, or may be made manually by the user himself / herself.

[0052] The power operation plan creation process in power operation system 20 will be described with reference to the flowchart of FIG. In the power operation system 20, the plan creation unit 2107 creates a power operation plan to maximize power operation profits based on information such as the current state and predicted future state of the storage battery 36, the current state and predicted future state of other power generation equipment or power consumption equipment, predicted power buying and selling prices, predicted imbalance charges, predicted power generation amount, predicted power demand amount, etc. (S101). If it is found that operation based on the created power operation plan will result in restrictions on charging and discharging the storage battery 36 (S102: YES), the determination unit 2108 determines the section (time period) in which the power operation plan should be changed (S104), and instructs the plan creation unit 2107 to create a revised operation plan (S105). Even if it is not possible to predict that restrictions will occur in the charging and discharging of the storage battery 36 (S102: NO), if information that will affect the power operation plan, such as a large fluctuation in the power buying and selling price in the power trading market, is obtained (S103: YES), the determination unit 2108 determines the section (time period) in which the plan should be changed (S104) and instructs the plan creation unit 2107 to create a revised operation plan or an avoidance measure operation plan in the case where an avoidance measure is adopted (S105). If no information that will affect the power operation plan is obtained (S103: NO), the plan determination unit 2110 performs charge and discharge control of the storage battery, power generation and sales, or power supply and procurement based on the original power operation plan (S109).

[0053] The plan creation unit 2107, which has received the instructions to create the corrected operation plan and the avoidance action operation plan, creates the corrected operation plan and the avoidance action operation plan (S106, S112). In order to create the avoidance action operation plan, the plan creation unit 2107 determines the avoidance action to be adopted (S111). The avoidance action is determined based on the magnitude of the constraint that occurs in the charging and discharging of the storage battery 36. For example, if the expected degree of exceeding the temperature constraint is predicted to be 0 degrees or more, a plan is made to operate the air-cooling fan during that time period, but if the expected degree of exceeding the temperature constraint is predicted to be 5 degrees or more, a avoidance action operation plan is created to operate the air-cooling fan three hours prior to that time period. Thereafter, the calculation and comparison unit 2109 calculates the power operation profit for each of the corrected operation plan and the avoidance action operation plan (including a plan in which both are implemented) (S107), determines the plan with the highest power operation profit (S108), and the plan determination unit 2110 instructs operation according to the corrected operation plan (S110), operation according to the avoidance action operation plan (S113), or operation according to a plan that combines both (S114). EXAMPLES

[0054] Hereinafter, a specific embodiment of the power operation system of the present invention will be described. [Embodiment 1: Use of the battery as a grid battery] In the first embodiment of the present invention, a power generation company uses a storage battery for a grid (hereinafter, referred to as a first storage battery in this embodiment) and buys and sells the charged electricity in the spot market. The first storage battery is equipped with a cooling fan to prevent a temperature rise during discharge. In order to increase the power generation company's power operation profits, the battery is charged when the spot market price is low and sold when the spot market price is high, and there is no limit on the number of charge and discharge cycles.

[0055] The main operational constraints of this battery were that the battery temperature had to be kept within a certain range, the DC current had to be kept below a certain level, and charging and discharging had to be performed according to the SOC state. 7A and 7B show the relationship between the charge / discharge elapsed time and the SOC of the storage battery in the first embodiment. For example, suppose that the SOC of the first storage battery was 50.0% at 8:00 a.m. on Monday. Since the spot market price was predicted to be very high on the following Tuesday, in order to maximize the operating profit of the first storage battery, it is desired to sell (discharge) as much electricity as possible during the period when the spot market price is high. However, according to the power generation and sales plan and the power operation plan, which included the storage battery operation plan, that were submitted by the previous day, Sunday, the SOC was expected to be 100.0% at the end of the day on Monday, so a plan was made to sell (discharge) electricity on Tuesday in the frame when the spot market price was predicted to be the highest.

[0056] However, if the planned five-hour continuous power selling (discharging) was to continue, the temperature rise of the first storage battery would be large, exceeding the upper limit of the operating temperature, resulting in operational constraints, and it was predicted that power selling (discharging) would only be possible up to 40.0% SOC (Fig. 7A). Therefore, a new plan was made to operate the cooling fan to cool the first storage battery during the power selling (discharging) time on Tuesdays. Although the operation of the cooling fan also consumes electricity, this can be achieved by utilizing electricity purchased when the spot market price is low, which helps prevent a deterioration in power operation revenue. As a result, power selling (discharging) could be continued until the SOC decreased to about 10.0%, generating large power operation revenue (Fig. 7B).

[0057] [Embodiment 2: Using a storage battery as a renewable energy storage battery] In the second embodiment of the present invention, a power generation company installs a solar power generation facility on the roof of a factory of a company that is a power consumer, and uses a storage battery (hereinafter, referred to as the second storage battery in this embodiment) attached to the power generation facility. The second storage battery is equipped with a cooling fan to prevent a temperature rise during discharge. Of the electricity generated by the solar power generation equipment (hereinafter referred to as the generated electricity in this embodiment), the electricity consumed in the factory is sold as self-consumption electricity at a fixed price based on the power purchase agreement (PPA) that the power generation company has concluded with the company.

[0058] When the amount of generated power exceeds the amount of self-consumption, the surplus power can be sold on the spot market. However, when the electricity price on the spot market is low, the surplus power is not sold on the spot market as it is, but is temporarily charged in a second storage battery installed next to the plant, and is sold as the power consumption of the factory at a fixed price based on the PPA contract during the time when power generation is not being performed. Here, the main operational constraints of the storage battery are largely three points, as in the first embodiment, that is, the storage battery temperature must be kept within a certain range, the DC current must be kept below a certain level, and charging and discharging must be performed according to the SOC state.

[0059] FIG. 8 shows the relationship between the charge / discharge elapsed time and the SOC of the storage battery in the second embodiment. For example, assume that the SOC of the storage battery was 50.0% at 8:00 a.m. on Monday. Since it was predicted that the spot market price would be very low during the day on the following Tuesday, in order to maximize the profits from selling electricity, the company decided not to sell surplus electricity to the market even if it was generated, but to charge the storage battery as much as possible, and then sell the electricity to consumers as nighttime power consumption at the factory during the hours after sunset when there is no power generated from the solar power generation equipment. On the other hand, according to the power generation sales plan and storage battery operation plan submitted by the previous day, Sunday, the SOC was expected to be 90.0% at the end of Monday, and based on the obtained power generation amount and power demand forecast for Tuesday, it was predicted that a certain amount of surplus electricity would be generated in the three hours between 11:00 and 14:00.

[0060] Therefore, we considered temporarily charging all of the surplus electricity into the second storage battery, but found that if we charged the entire amount, the SOC would exceed 100.0%. Therefore, we changed the plan to sell electricity in advance between 3:00 and 7:00 on Tuesdays, as shown in Figure 8, and charge the entire amount of surplus electricity generated during the day in a state where the SOC has been reduced to 10.0%. In the revised plan, we decided to start the air-cooling fan installed on the second storage battery in advance from Monday night in order to prevent the temperature of the second storage battery from rising when it is discharged and ensure that electricity can be sold, and the power consumption associated with the operation of the air-cooling fan was included in the power demand when calculating the revenue from electricity trading. As a result, the entire amount of surplus electricity could be charged during the day on Tuesday, and then after sunset, the electricity could be sold to consumers as the factory's overnight power consumption, generating significant revenue from power operations.

[0061] [Embodiment 3: Using a storage battery as a renewable energy storage battery] In the third embodiment of the present invention, as in the second embodiment, a photovoltaic power generation facility is installed on the roof of a factory of a company that is a power consumer, and a storage battery (hereinafter, referred to as the third storage battery in this embodiment) is also used. The third storage battery is equipped with a cooling fan to prevent a rise in temperature during discharge. Of the power generated by the photovoltaic power generation facility (hereinafter, referred to as the generated power amount in this embodiment), the power consumed in the factory is sold as self-consumption power at a fixed price based on a power purchase agreement (PPA) concluded between the power generation company and the company.

[0062] When the amount of generated power exceeds the amount of self-consumption, the surplus power can be sold on the spot market. However, when the electricity price in the spot market is low, the surplus power is not sold directly on the spot market, but is temporarily charged in the third storage battery installed next to the battery, and is sold collectively when the spot market price is high. Here, the main operational constraints of the storage battery are largely three points, as in the first and second embodiments, namely, that the storage battery temperature must be kept within a certain range, that the direct current must be kept below a certain level, and that charging and discharging must be performed according to the SOC state.

[0063] FIG. 9 shows the relationship between the charge / discharge elapsed time and the SOC of the storage battery in the third embodiment. For example, assume that the SOC of the storage battery was 50.0% at 8:00 a.m. on Monday. Since it was predicted that the price in the spot market would be very low during the day on the following Tuesday, in order to maximize the revenue from selling electricity, the company decided not to sell surplus electricity to the market even if it generated electricity, but to charge the storage battery as much as possible and then sell it all at once when the price in the spot market rises. On the other hand, according to the power generation sales plan and storage battery operation plan submitted by the previous day, Sunday, the SOC was expected to be 90.0% at the end of the day on Monday, and based on the power generation forecast and power demand forecast for Tuesday, it was predicted that a certain amount of surplus electricity would be generated in the three hours between 11:00 and 14:00.

[0064] We considered temporarily charging all of the surplus electricity into the third storage battery, but found that if we charged the entire amount, the SOC would exceed 100.0%. Therefore, we changed the plan to sell electricity in advance between 3:00 and 7:00 on Tuesdays, as shown in Figure 9, and reduce the SOC to about 10.0%, so that we could charge the entire amount of surplus electricity generated during the day. In the revised plan, we decided to operate the cooling fan installed in the third storage battery as necessary to prevent the temperature from rising when the third storage battery is discharged and ensure that electricity can be sold. The power consumption associated with the operation of the cooling fan was included in the electricity demand when calculating the revenue from electricity trading. As a result, the entire amount of surplus electricity could be charged during the day on Tuesday, and then when the spot market price rose, the entire amount could be sold, generating significant revenue from power operations.

[0065] Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within the scope that can achieve the object of the present invention are included in the present invention. [Explanation of symbols]

[0066] 1: Management server, 2: User server, 3: External agency server, 20: Power operation system, 210: Control unit, 220: Input unit, 230: Storage device, 240: Display unit, 250: Communication unit, 260: Output unit, 270: System bus, 2101: Acquisition unit, 2102: Status acquisition unit, 2103: Power purchase price acquisition unit, 2104: Imbalance fee acquisition unit, 2105: Power generation amount acquisition unit, 2106: Power demand amount acquisition unit, 2107: Plan creation unit, 2108: Judgment unit, 2109: Calculation and comparison unit, 2110: Plan determination unit, 21 11: Memory unit, 31: Power generation equipment (solar), 32: Power generation equipment (wind), 33: Power generation equipment (other), 34: Power consumption equipment (motor), 35: Power consumption equipment (lighting), 36: Storage battery, 37: Other resources, 41: Spot market, 42: Hourly market, 43: Supply and demand adjustment market, 44: Capacity market, 45 Retail electricity supplier, 46: Other electricity buyers, 47: Agency for Promotion of Wide-area Coordination of Electric Power Companies, 50: Information source, 51: Meteorological information, 52: Power generation facility information, 53: Current affairs information, 54: Information on wide-area reserve rate for power system utilization, 55: Electricity market information.

Claims

1. a state acquisition unit that acquires a current state and a predicted future state of the storage battery, including at least one of a state of charge (SOC), a state of health (SOH), and a battery temperature of the storage battery, and a current state and a predicted future state of a power generation facility or a power consumption facility; a buying and selling price acquisition unit for acquiring a predicted value of a future electricity buying and selling price in the electricity trading market; an imbalance fee acquisition unit that acquires a future imbalance fee predicted value; a power generation amount acquiring unit for acquiring a predicted value of a future power generation amount; and a power demand acquiring unit for acquiring a predicted value of a future power demand amount; one or more acquisition units selected from a plan creation unit that creates a charge / discharge plan, a power generation sales plan, and a demand procurement plan for the storage battery that maximizes the power operation profit based on some or all of the current state and future state prediction of the storage battery, the current state and future state prediction of the power generation facility or the power consumption facility, the power purchase / sale price prediction value, the imbalance fee prediction value, the power generation amount prediction value, and the power demand prediction value, which are acquired by the selected acquisition unit; A storage unit that stores a constraint condition that restricts an operation of the storage battery and a measure to avoid the constraint; A power operation system having the above configuration.

2. A determination unit that determines an area in which the created charge / discharge plan, power generation / sales plan, and demand procurement plan need to be changed based on the stored constraint conditions; In the section determined by the determination unit, The power operation profit when the charging / discharging plan, the power generation / sales plan, and the demand procurement plan are changed, The power operation profit when the above-mentioned constraint avoidance measures are implemented, and The power operation profit when the charging / discharging plan, the power generation / sales plan, and the demand procurement plan are changed and the measures to avoid the constraints are implemented; and A calculation and comparison unit that calculates and compares two or more selected from A plan determination unit that changes the charge / discharge plan, the power generation / sales plan, and the demand procurement plan or implements measures to avoid the constraint conditions based on a comparison result of the calculation / comparison unit; The power operation system of claim 1 .

3. The constraint conditions include a constraint on a duration of charging / discharging due to a temperature change of the storage battery, a constraint on an upper and lower limit temperature at which charging / discharging is stopped, a constraint on an amount of current during charging / discharging, and a constraint on an upper and lower limit of SOC. The power operation system of claim 2 .

4. The power operation system according to claim 2 , wherein the avoidance measures include adjusting a charge / discharge amount of the storage battery, or cooling or heating the storage battery.

5. The power operation system of claim 2, wherein the power operation revenue can be calculated using one or more selected from the cost of electricity associated with the implementation of the avoidance measures, the cost of electricity used in the power generation equipment and auxiliary equipment installed in the storage battery, and imbalance costs.

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