Power supply and demand system

Abstract

To provide a power demand / supply system which can efficiently adjust demand / supply balance of electric power in a factory.SOLUTION: A power demand / supply system used in a factory manufacturing a vehicle comprises: an on-vehicle secondary battery which is mounted on a vehicle capable of traveling in the factory through remote control in a manufacturing process in the factory; a central rechargeable battery which can supply appliances in the factory with electric power; a charger which can supply electric power accumulated in the central rechargeable battery to the on-vehicle secondary battery; a power incoming device which can supply electric power accumulated in the on-vehicle secondary battery to the central rechargeable battery; and a power generation facility which is equipped in the factory to be capable of supplying electric power generated in the power generation facility to the central rechargeable battery.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This disclosure relates to a power supply and demand system.

Background Art

[0002] For example, Patent Document 1 discloses a vehicle traveling method in a manufacturing system for manufacturing a vehicle, in which the vehicle is remotely controlled to travel from the end of the assembly line of the manufacturing system to the parking lot of the manufacturing system.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a manufacturing system, fluctuations in power consumption due to loads and fluctuations in the supply and demand of renewable energy may occur. In the manufacturing system, no technology has been studied for realizing the power supply and demand of the entire manufacturing system including the secondary battery mounted on the vehicle during manufacturing.

Means for Solving the Problems

[0005] This disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present disclosure, a power supply system for use in a factory that manufactures vehicles is provided. The power supply system comprises: an on-board secondary battery mounted on a vehicle that can travel within the factory by remote control during the manufacturing process of the factory; a central storage battery capable of supplying power to the factory's equipment; a charging device capable of supplying power stored in the central storage battery to the on-board secondary battery; a power receiving device capable of supplying power stored in the on-board secondary battery to the central storage battery; and a power generation facility provided in the factory, the power generation facility capable of supplying power generated by the power generation facility to the central storage battery. This type of power supply and demand system allows for the entire factory to have a power supply and demand system by utilizing on-board secondary batteries installed in vehicles during the manufacturing process as an energy resource capable of supplying and demanding power to a central battery. (2) The power supply and demand system of the above form may further include a control unit that acquires the trend of the amount of power generated by the power generation equipment and the trend of the amount of power consumed by the central storage battery, and uses the acquired trend of the amount of power generated by the power generation equipment and the trend of the amount of power consumed by the central storage battery to determine the target charge rate of the central storage battery. This type of power supply and demand system allows for the adjustment of the power supply and demand balance throughout the entire factory by installing a control unit. (3) In the power supply and demand system of the above configuration, the control unit may determine the target charge rate of the central battery using the trend in the number of vehicles produced at the factory. This type of power supply and demand system allows for improved accuracy in power supply and demand estimation by determining the number of onboard secondary batteries, which are easy to adjust the charge level of during the manufacturing process. (4) In the power supply and demand system of the above configuration, the control unit may prompt the charging device to charge the on-board secondary battery when the charge level of the central storage battery is above a predetermined upper limit or is expected to be above the upper limit. This type of power supply and demand system allows for more efficient adjustment of the power supply and demand balance in factories by prioritizing the use of onboard rechargeable batteries, which have easily adjustable charge levels during the manufacturing process, as an energy resource. (5) In the power supply and demand system of the above configuration, the control unit may prompt charging from the on-board secondary battery to the central battery via the power receiving device when the charge level of the central battery is below a predetermined lower limit or is expected to be below the lower limit. This type of power supply and demand system allows for more efficient adjustment of the power supply and demand balance in factories by prioritizing the use of onboard rechargeable batteries, which have easily adjustable charge levels during the manufacturing process, as an energy resource. This disclosure can also be implemented in various forms other than power supply systems. For example, it can be implemented in the form of a power supply and demand adjustment device, a remote automatic driving system, a power demand adjustment method, a central battery charging method, a server, a vehicle manufacturing method, a charging device, a charging device control method, a computer program that implements the control method, a non-temporary recording medium that stores the computer program, etc. [Brief explanation of the drawing]

[0007] [Figure 1] An explanatory diagram showing the schematic configuration of a power supply and demand system as a first embodiment of this disclosure. [Figure 2] An explanatory diagram showing the configuration of the remote control device and the vehicle. [Figure 3] A flowchart illustrating the processing routine for adjusting electricity supply and demand. [Figure 4] An explanatory diagram showing an example of the change in the charge level of the central battery. [Modes for carrying out the invention]

[0008] A. First Embodiment: Figure 1 is an explanatory diagram showing the schematic configuration of a power supply and demand system 800 as a first embodiment of the present disclosure. The power supply and demand system 800 manages the power supply and demand of a factory fuel cell (FC) that manufactures vehicles 100. Vehicles 100 include, for example, passenger cars, trucks, buses, and construction vehicles. The power supply and demand system 800 comprises energy resources including a central battery 80, a power generation facility 90 capable of charging the central battery 80, batteries 120 mounted on the vehicles 100, and a charging device 200 capable of charging the batteries 120.

[0009] The central battery 80 handles the supply and demand of electricity with various energy resources inside and outside the factory fuel cell. The central battery 80 is an industrial battery and can employ, for example, lithium-ion batteries or sodium-sulfur batteries. Battery 120 is a rechargeable on-board secondary battery, such as a lithium-ion battery or nickel-metal hydride battery. Battery 120 stores electricity used to power the vehicle 100. Battery 120 may further include an auxiliary battery with a low voltage capable of supplying power to the auxiliary equipment of the vehicle 100. The central battery 80 can be charged with, for example, electricity purchased from power generation equipment 90 and businesses OS outside the factory fuel cell. Business OS includes, for example, electricity retailers S1, renewable energy power generators S2, and general consumers S3.

[0010] The power generation equipment 90 generates electricity that can be used in the factory fuel cell. The power generation equipment 90 can employ renewable energy sources such as solar, wind, geothermal, small-scale hydropower, and biomass. The power generation equipment 90 may also include generators that utilize fossil fuels such as oil, coal, and natural gas. The electricity generated by the power generation equipment 90 is supplied to the central battery 80.

[0011] The charging device 200 supplies power from the central battery 80 to the vehicle 100's battery 120. In the example shown in Figure 1, the charging device 200 includes a non-contact charging device 200A that performs power transmission using magnetic field resonant coupling, and a contact charging device 200B that charges by connecting a power supply connector to the vehicle 100. The charging device 200 may consist of either a non-contact type or a contact type alone. In this embodiment, as will be described later, the charging device 200A is laid on the vehicle 100's track RT and can receive power transmitted from the vehicle 100's battery 120 in a non-contact manner and supply it to the central battery 80. By providing power transmission and reception equipment on the vehicle 100's track RT, it becomes easy to use the vehicle 100's battery 120 while it is running to adjust the power supply and demand. Furthermore, in the supply and demand of power between the vehicle 100 and the charging device 200, from the viewpoint of suppressing power loss, it is preferable to use the contact-type charging device 200B, which has high power transmission efficiency, in preference to the non-contact-type charging device 200A. Also, in the supply and demand of power between the vehicle 100 and the charging device 200A, from the viewpoint of suppressing power loss, it is preferable to prioritize power transmission when the vehicle 100 is stopped rather than when the vehicle 100 is moving. However, in this case, it is preferable to do so on the premise that it does not affect the productivity of the vehicle 100. The charging device 200A may be configured to perform only either charging from the central storage battery 80 to the battery 120, or charging from the battery 120 to the central storage battery 80.

[0012] As shown in Figure 1, the power supply and demand system 800 may also be provided with auxiliary batteries 82 as an energy resource. The auxiliary batteries 82 are provided for each process or building in the manufacturing process of the factory fuel cell. The auxiliary batteries 82 are electrically connected to the central battery 80 and supply power received from the central battery 80 to each process, etc. If the State of Charge (SOC) of the central battery 80 becomes higher than a predetermined charge level, power is supplied from the central battery 80 to the auxiliary batteries 82 in order to suppress degradation of the central battery 80 and avoid full charge. Also, if the charge level of the central battery 80 becomes lower than a predetermined charge level, power is supplied from the auxiliary batteries 82 to the central battery 80 in order to suppress degradation of the central battery 80. In other words, the auxiliary batteries 82 have the function of mitigating excesses and deficiencies in the charge level of the central battery 80. Note that the central battery 80 and the auxiliary batteries 82 may be singular or any number of two or more.

[0013] The power supply and demand system 800 may further include a power supply and demand adjustment device 600, a remote control device 300, a process control device 400, and a charging device management device 500. The process control device 400 manages manufacturing information for each process in the manufacturing process of the factory fuel cell, as well as the amount of power consumed in each process. "Manufacturing information" refers to, for example, the factory fuel cell's operating plan, the number of work-in-progress items, the number of products being processed, and the planned number of products to be manufactured per unit period. The charging device management device 500 controls the transmission and reception of power by the charging device 200 and manages the amount of power related to the transmission and reception of power by the charging device 200.

[0014] The remote control device 300 transports the vehicle 100 within the manufacturing process at the factory fuel cell by remotely controlling the vehicle 100 to move automatically. Transporting the vehicle 100 using remotely controlled automatic movement is also called "self-propelled transport."

[0015] As shown in the lower part of FIG. 1, the factory FC is equipped with a pre-process 50, a post-process 60, and a runway RT for the vehicle 100. The runway RT is a conveyance section for the vehicle 100 between each process, or a section where the completed vehicle 100 is conveyed to the shipping yard PA where it waits for shipment. Each process may exist over a plurality of locations having different sites. "The vehicle 100 travels within the factory FC" includes the case where the vehicle 100 travels not only on a private road but also on a public road in order to move between processes at a plurality of locations.

[0016] The pre-process 50 and the post-process 60 are various processes belonging to the manufacturing process of the vehicle 100. The pre-process 50 is, for example, an assembly process of assembling vehicle parts such as the battery 120 to the vehicle body. The post-process 60 is, for example, an inspection process of the vehicle 100. The vehicle 100 is completed as a product after finishing the post-process 60. The completed vehicle 100 travels to the shipping yard PA by remote control and is shipped to the corresponding shipping destination for each vehicle 100.

[0017] FIG. 2 is an explanatory diagram showing the configurations of the remote control device 300 and the vehicle 100. The vehicle 100 includes a vehicle communication unit 190, a motor 140, a battery 120, an ECU (Electronic Control Unit) 180, and a power receiving device and a power transmitting device. The vehicle communication unit 190 performs wireless communication with external devices of the vehicle 100 such as the remote control device 300 connected to the network 72 via the access point 70 within the factory FC. The vehicle communication unit 190 may transmit information such as the charging rate of the battery 120 to the charging device 200, the remote control device 300, etc.

[0018] The power receiving device includes a power receiving circuit 150, a power receiver 152, and a power receiving resonance circuit 154. The power receiver 152 is a power feeding inlet or the like corresponding to the power feeding connector of the charging device 200B. The power receiving resonance circuit 154 includes a power receiving coil and a power receiving resonance capacitor (not shown). The power receiving circuit 150 is a rectifier, a DC / DC converter, or the like. When AC power is supplied from the power receiver 152 or the power receiving resonance circuit 154, the power receiving circuit 150 converts the supplied AC power into DC power by the rectifier. The converted DC power is supplied to the battery 120 via the DC / DC converter.

[0019] The power transmitting device includes a power transmitting circuit 160 and a power transmitting resonance circuit 164. The power transmitting circuit 160 is an inverter or the like. The power transmitting circuit 160 converts the DC power supplied from the battery 120 into AC power of an operating frequency and supplies it to the power transmitting resonance circuit 164. The power transmitting circuit 160 may include a rectifying circuit, a filter circuit, or the like. The power transmitting resonance circuit 164 includes a power transmitting coil and a power transmitting resonance capacitor (not shown).

[0020] The charging device 200A includes a power transmitting device 250A and a power receiving device 260A. The power transmitting device 250A includes a power transmitting resonance circuit 254 and a power transmitting circuit 250, and the power receiving device 260A includes a power receiving resonance circuit 264 and a power receiving circuit 260. The power transmitting circuit 250 is an inverter or the like. The power receiving circuit 260 is a rectifier, a DC / DC converter, or the like. The power receiving resonance circuit 264 includes a power receiving coil and a power receiving resonance capacitor (not shown). The power transmitting resonance circuit 254 includes a power transmitting coil and a power transmitting resonance capacitor (not shown). When AC power is supplied from the power receiving resonance circuit 264, the power receiving circuit 260 converts the supplied AC power into DC power by the rectifier. The converted DC power is supplied to the central battery 80 via the DC / DC converter.

[0021] The power transmission resonant circuit 254 and power reception resonant circuit 264 of the charging device 200A are arranged continuously over the entire length of the track RT. When the power transmission resonant circuit 254 and the power reception resonant circuit 154 of the vehicle 100 face each other, an induced electromotive force is generated in the power reception resonant circuit 154. Similarly, when the power reception resonant circuit 264 and the power transmission resonant circuit 164 of the vehicle 100 face each other, an induced electromotive force is generated in the power reception resonant circuit 264. In this embodiment, the power transmission circuit 250 and the power reception circuit 260 are controlled by the charging device management device 500. The exchange of power between the battery 120 and the charging device 200A is controlled by the charging device management device 500.

[0022] Motor 140 is, for example, an AC synchronous motor and functions as both an electric motor and a generator. When motor 140 functions as an electric motor, it is driven using power stored in battery 120 as its power source. The output of motor 140 is transmitted to the wheels via a reduction gear and axle. When vehicle 100 is decelerated, motor 140 functions as a generator utilizing the rotation of the wheels and generates regenerative power. When power supplied from charging device 200 to power receiving device, as well as regenerative power generated by motor 140, is supplied to battery 120, battery 120 is charged and its State of Charge (SOC) increases. A Power Control Unit (PCU) having an inverter, a boost converter, and a DC / DC converter may be connected between battery 120 and motor 140.

[0023] The ECU 180 is mounted on the vehicle 100 and performs various controls on the vehicle 100. The ECU 180 is equipped with memory such as an HDD, optical recording medium, and semiconductor memory, and a CPU as a central processing unit. By executing various computer programs stored in memory, the CPU realizes functions such as the driving control unit that performs driving control of the vehicle 100. "Driving control" refers to, for example, adjustment of acceleration, speed, and steering angle. In remote control, the ECU 180 controls each actuator mounted on the vehicle 100 according to the remote control control signals received from the remote control device 300 via the vehicle communication unit 190. The ECU 180 also calculates the charge level of the battery 120 using, for example, the cell voltage, current, and temperature of the battery 120.

[0024] The remote control device 300 comprises a CPU 310 as a central processing unit, a storage device 320, and a remote communication unit 390. These are interconnected via an internal bus, interface circuits, etc. The remote communication unit 390 communicates with the vehicle 100 and the power supply and demand adjustment device 600, etc., via the network 72.

[0025] The storage device 320 is, for example, RAM, ROM, HDD (hard disk drive), SSD (solid state drive), etc. The computer program stored in the storage device 320 is executed by the CPU 310, causing the CPU 310 to function as a remote control unit 312 and a charge rate acquisition unit 314. However, some or all of these functions may be configured by hardware circuits. The charge rate acquisition unit 314 acquires the charge rate of the battery 120 from the vehicle 100. The acquired charge rate of the battery 120 is output to the power supply and demand adjustment device 600.

[0026] The remote control unit 312 transmits a control signal to the vehicle 100 via the remote communication unit 390 requesting remote control of the vehicle 100. When the vehicle 100 receives the request for remote control, the ECU 180 implements driving control, and as a result, the vehicle 100 drives automatically. The remote control unit 312 analyzes images of the vehicle 100 acquired by the camera CA located in the factory FC and causes the ECU 180 to execute driving control of the vehicle 100. The remote control unit 312 adjusts the relative position of the vehicle 100 with respect to a target route pre-set on the track RT through image analysis, thereby causing the vehicle 100 to drive along the target route.

[0027] Returning to Figure 1, the power supply and demand adjustment device 600 manages the supply and demand of electricity at the factory fuel cell (FC) by consolidating energy resources within the factory FC and the operator's OS. The power supply and demand adjustment device 600 can also be called an aggregator. The power supply and demand adjustment device 600 comprises a CPU 610 as a central processing unit, storage devices 620 such as RAM, ROM, HDD, and SSD, and a communication unit 690 with wireless communication capabilities. These are connected to each other via an internal bus and interface circuits. The communication unit 690 is a communication device for communicating with external devices such as the vehicle 100, power generation equipment 90, remote control device 300, process control device 400, and charging device management device 500. By executing a program stored in the storage device 620, the CPU 610 realizes some or all of the functions of the control unit 612 and other components.

[0028] The control unit 612 adjusts the supply and demand of electricity within the factory fuel cell by centrally managing energy resources. The supply and demand of electricity within the factory fuel cell includes, for example, the amount of electricity purchased from the operator OS, the amount of electricity generated by the power generation equipment 90, and the amount of electricity consumed by the central battery 80. Specifically, the control unit 612 acquires the trends in the supply and demand of electricity from each energy resource. The control unit 612 determines the target charge rate of the central battery 80 in order to avoid imbalances in the acquired trends in the supply and demand of electricity. The control unit 612 controls each energy resource in order to achieve the determined target charge rate.

[0029] For predicting electricity supply and demand, machine learning models using neural networks (NNs), for example, can be used. Machine learning models suitable for time series analysis using historical data are used. For predicting electricity supply and demand, models with architectures such as recurrent neural networks (RNNs), convolutional neural networks (CNNs), general regression neural networks (General Regression Neural Networks), or random forests are preferred. In this embodiment, a learning model equipped with an RNN having a recurrent structure such as long short-term memory (LSTM) capable of long-term time series analysis is employed. The machine learning model stored in the memory device 620 is a trained model that uses historical electricity supply and demand data from energy resources as training data. As a training method for the neural network, support vector machines (SVMs) or backpropagation are preferably used. Furthermore, various methods such as regression analysis (including multiple regression analysis) and multivariate analysis may be used to forecast electricity supply and demand, not just machine learning.

[0030] The control unit 612 predicts, for example, the amount of electricity generated per unit time by the photovoltaic power generation device in the power generation facility 90. In this case, the amount of electricity generated per unit time by the photovoltaic power generation device is set as the dependent variable. Solar radiation intensity, the time of day (24 hours), solar altitude, binary data indicating whether it is daytime or not, and weather information such as weather and temperature are set as independent variables. Note that solar altitude is the angle to the sun measured with the horizon direction being zero degrees and the zenith being 90 degrees. The control unit 612 uses the predicted trend of electricity generation to determine the target charge level of the central battery 80.

[0031] The control unit 612 may further determine the target charge rate of the central battery 80 by predicting the trend in the power consumption of the central battery 80 using manufacturing information. The control unit 612 may also determine the target charge rate of the central battery 80 by predicting the trend in the power consumption of the central battery 80 using, for example, the trend in the number of vehicles 100 produced in the factory fuel cell. The trend in the number of vehicles 100 produced can be obtained using manufacturing information for each process and the order quantity of vehicles 100 obtained from the process control device 400. When the number of vehicles 100 produced is large, the amount of power consumed in each process and each vehicle 100 may be larger than when the number is small. Also, if the number of vehicles 100 produced is large, the number of batteries 120 in the factory fuel cell increases, so the total amount of power in the factory fuel cell may increase. Therefore, by using the trend in the number of vehicles 100 produced, the accuracy of predicting the trend in the charge rate of the central battery 80 can be improved.

[0032] The control unit 612 may further determine the target charge level of the central battery 80 using the manufacturing status of the factory fuel cell. "Manufacturing status" refers to the deviation of the actual manufacturing time from the target manufacturing time. "Target manufacturing time" is the target value of the manufacturing time required to process one vehicle 100. The target manufacturing time is sometimes called "cycle time". If manufacturing is behind schedule, the amount of electricity consumed in each process and each vehicle 100 may be higher than usual. By using the manufacturing status of each process, the accuracy of predicting the trend of the charge level of the central battery 80 can be improved.

[0033] The control unit 612 may further determine the target charge rate of the central battery 80 using the trend of the amount of electricity received from outside the factory fuel cell, such as the operator's OS. The control unit 612 may also determine the target charge rate of the central battery 80 using power generation failures at the operator's OS due to accidents, or abnormalities in power transmission between energy resources.

[0034] Figure 3 is a flowchart showing the processing routine for power supply and demand adjustment in this embodiment. This flow is started, for example, when the power supply and demand adjustment device 600 is turned on, or at a predetermined power supply and demand adjustment timing. This flow may be executed repeatedly at predetermined time intervals, such as one hour or one day.

[0035] In step S10, the change in the charge rate of the central battery 80 per unit time is predicted. In step S20, it is checked whether the charge rate of the central battery 80 within that unit time is within a predetermined reference range, including a predetermined reference value. If it is within the reference range (S20: within the reference range), the control unit 612 controls each energy resource so that the power consumption of the central battery 80 is in line with the reference value.

[0036] Figure 4 is an explanatory diagram showing an example of the change in the charge level of the central battery 80. As shown in Figure 4, the charge level of the central battery 80 is set up with a predetermined upper limit USL, a lower limit LSL, and a reference value CP for the purpose of managing the charge level of the central battery 80. The range between the lower limit LSL and the upper limit USL is the reference range.

[0037] As shown in region D1 of Figure 4, if the charge level of the central battery 80 exceeds or is predicted to exceed the upper limit USL of the reference range (S20: above the upper limit), the control unit 612 proceeds to step S60. In step S60, the control unit 612 increases the demand for power stored in the central battery 80 in order to reduce the charge level of the central battery 80. As a result, it is possible to suppress or prevent the charge level of the central battery 80 from exceeding the upper limit USL.

[0038] The control unit 612 performs, for example, at least one of the following processes in order to increase the demand for power stored in the central battery 80. (1) A process of charging the battery 120 from the central storage battery 80 via the charging device 200A. However, in this case, it is preferable to avoid the State of Charge (SOC) of the battery 120 falling into the degradation range of the battery 120. (2) A process to drive each vehicle 100 in a driving manner that removes the restrictions that suppress the power consumption of the battery 120. Examples of restrictions that suppress the power consumption of the battery 120 include, for example, restrictions on the acceleration and speed of the vehicle 100, and restrictions on the number of starts and stops. (3) A process to increase the amount of charge from the central battery 80 to the auxiliary battery 82, or a process to increase the power consumption of the auxiliary battery 82. (4) A process to remove the power consumption restrictions imposed by loads within the factory fuel cell, such as air conditioning, lighting, and production equipment. (5) Processing to reduce the amount of electricity purchased from the service provider's OS.

[0039] For example, if the solar radiation intensity is stronger than usual during a predetermined time period, the amount of electricity generated by the photovoltaic power generation device as the power generation equipment 90 will increase. As a result, as shown from time t1 to time t2 in Figure 4, it is predicted that the amount of electricity stored in the central battery 80 will be higher than the reference value. In this case, the control unit 612 will increase the demand for electricity stored in the central battery 80 in order to lower the target charge rate of the central battery 80. Specifically, the control unit 612 will increase the amount of electricity supplied from the central battery 80 to the auxiliary battery 82 and the amount of electricity supplied from the charging device 200 to the battery 120 of the vehicle 100 during that time period. As a result, the target charge rate of the central battery 80 during that time period can be brought closer to the reference value.

[0040] As shown in region D2 of Figure 4, if the charge level of the central battery 80 is below the lower limit LSL of the reference range, or is predicted to be below the lower limit LSL (S20: below the lower limit), the control unit 612 moves the process to step S40. In step S40, the control unit 612 reduces the demand for power stored in the central battery 80 in order to increase the charge level of the central battery 80. As a result, it is possible to suppress or prevent the charge level of the central battery 80 from falling below the lower limit LSL.

[0041] The control unit 612 performs, for example, at least one of the following processes in order to reduce the demand for power stored in the central battery 80. (1) A process of charging the central storage battery 80 from the battery 120 via the charging device 200A. However, in this case, it is preferable to avoid the State of Charge (SOC) of the battery 120 falling into the degradation range of the battery 120. Furthermore, it is preferable that the power supply from the battery 120 to the central storage battery 80 be restricted to being performed only under predetermined conditions. These predetermined conditions include, for example, when the amount of power generated by the power generation equipment 90 and the amount of power supplied from the operator OS outside the factory FC are expected to fall below a predetermined amount. By configuring it in this way, it is possible to suppress or prevent power depletion during the self-propelled transport of the vehicle 100. (2) A process to drive each vehicle 100 using a driving method that suppresses the power consumption of the battery 120. Examples of driving methods that suppress the power consumption of the battery 120 include reducing the acceleration and speed of the vehicle 100, and reducing the number of starts and stops of the vehicle 100. (3) Processing to suppress power consumption of the auxiliary battery 82. (4) Processing to reduce the power consumption of equipment in each process within the factory fuel cell, such as air conditioning, lighting, and production equipment. (5) A process to increase the amount of electricity purchased from the service provider's OS.

[0042] If the control unit 612 acquires weather information indicating that it will rain during a predetermined time period, such as from time t3 to time t4 as shown in Figure 4, the amount of power generated by the solar power generation device as the power generation equipment 90 will decrease. Therefore, it is predicted that the amount of charge stored in the central battery 80 will fall below the reference value, as shown from time t3 to time t4 in Figure 4. In this case, the control unit 612 may, for example, determine a target charge rate so that the charge rate of the central battery 80 is higher in advance for the period from time t1 to time t2, which is before the time period in question. In the example in Figure 4, the control unit 612 may be set not to lower the charge rate of the central battery 80 in region D1. In this case, it is possible to prevent the amount of charge stored in the central battery 80 from falling below the reference value without adjusting the charge rate of the central battery 80 in region D2.

[0043] Furthermore, the control unit 612 may cause each energy resource to take actions such as increasing the amount of electricity purchased from the operator OS, supplying surplus electricity stored in the vehicle 100's battery 120 to the central battery 80, or reducing the vehicle 100's driving speed to suppress power consumption of the battery 120 by self-propelled transport, so that the charge level of the central battery 80 is higher than the reference value. In this case, when comparing the charge level of the battery 120 when the charge level of the central battery 80 is lower than the reference value with the charge level of the battery 120 when the charge level of the central battery 80 is higher than the reference value, the charge level of the battery 120 will be higher when the charge level of the central battery 80 is higher than the reference value.

[0044] In step S70, the control unit 612 checks whether the prediction of the charge rate of the central battery 80 over a predetermined period has been completed. If the prediction is not completed (S70: NO), the control unit 612 returns to step S10. If the prediction for the predetermined period has been completed (S70: YES), this flow is terminated.

[0045] As described above, the power supply and demand system 800 of this embodiment includes a battery 120 mounted on a vehicle 100 that can travel within the factory fuel cell by remote control, a central battery 80 capable of supplying power to the factory fuel cell's equipment, a charging device 200 capable of supplying power stored in the central battery 80 to the battery 120, a power receiving device 260A capable of supplying power stored in the battery 120 to the central battery 80, and a power generation facility 90 capable of supplying generated power to at least the central battery 80. By utilizing the battery 120 mounted on the vehicle 100 as a product, as an energy resource capable of supplying power to the central battery 80, the power supply and demand balance of the factory fuel cell can be adjusted efficiently. The battery 120 mounted on the vehicle 100 as a product is a so-called new product and is suitable for use in adjusting the charge level. Furthermore, as the number of vehicles 100 manufactured increases, the number of batteries 120 also increases, expanding the range of energy resources and allowing for more efficient adjustment of the supply and demand balance.

[0046] The power supply and demand system 800 of this embodiment further includes a control unit 612 that determines the target charge level of the central battery 80 using the trend of power generation from the power generation equipment 90 and the trend of power consumption from the central battery 80. By providing the control unit 612, it is possible to manage energy resources and adjust the power supply and demand balance of the entire factory fuel cell.

[0047] According to the power supply and demand system 800 of this embodiment, the control unit 612 determines the target charge rate of the central battery 80 using the trend in the number of vehicles 100 produced at the factory fuel cell. Batteries 120 that have just been installed in newly manufactured vehicles 100 are easy to adjust the charge rate of and are suitable as energy resources. By using a number of batteries 120 that are suitable as energy resources, the accuracy of power supply and demand estimation can be improved.

[0048] According to the power supply and demand system 800 of this embodiment, the control unit 612 prompts charging of the battery 120 from the charging device 200 when the charge level of the central storage battery 80 is above a predetermined upper limit USL or is predicted to be above the upper limit USL. By preferentially utilizing the battery 120, which is suitable as an energy resource, the power supply and demand balance of the factory fuel cell can be efficiently adjusted. Furthermore, insufficient charge level of the vehicle 100's battery 120 can be suppressed or prevented, thereby suppressing or preventing the vehicle 100 from running out of power while self-propelled transport.

[0049] According to the power supply and demand system 800 of this embodiment, the control unit 612 prompts charging of the central battery 80 from the battery 120 via the charging device 200A when the charge level of the central battery 80 is below a predetermined lower limit LSL or is predicted to be below the lower limit LSL. By preferentially utilizing the battery 120, which is suitable as an energy resource, the power supply and demand balance of the factory fuel cell can be efficiently adjusted.

[0050] B. Other embodiments: (B1) In the above embodiment, an example was shown in which the power supply and demand adjustment device 600 is equipped with a control unit 612, and the control unit 612 determines the target charge rate of the central battery 80. However, the control unit 612 is not required. In this case, for example, an employee who has checked the trend of power generation from the power generation equipment 90 and the trend of power consumption from the central battery 80 can manually adjust the target charge rate of the central battery 80.

[0051] (B2) The vehicle 100 only needs to have a configuration that allows it to be moved by remote control. For example, it may be in the form of a platform having the configuration described below. Specifically, the vehicle 100 only needs to have a configuration that allows it to "drive," "turn," and "stop" by remote control. That is, a "vehicle 100 that can be moved by remote control" does not need to have at least some of the interior parts such as the driver's seat and dashboard installed, at least some of the exterior parts such as the bumper and fenders installed, and a body shell installed. In this case, the remaining parts such as the body shell may be installed on the vehicle 100 before it leaves the factory for shipment, or the remaining parts such as the body shell may be installed on the vehicle 100 after it has left the factory for shipment, while the remaining parts such as the body shell are not installed on the vehicle 100.

[0052] (B3) All or part of the functions of the power supply and demand adjustment device 600, such as the control unit 612, may be provided in at least one of the remote control device 300, the process control device 400, and the charging device management device 500. Also, all or part of the functions of the remote control device 300, such as the remote control unit 312 and the charge rate acquisition unit 314, may be provided in the power supply and demand adjustment device 600. All or part of the functions of the process control device 400 and the charging device management device 500 may be provided in the power supply and demand adjustment device 600.

[0053] (B4) In the above embodiment, examples were shown where the vehicle 100 is a passenger car, truck, bus, and construction vehicle. In contrast, the vehicle 100 may further include various automobiles such as motorcycles and four-wheeled vehicles, as well as trains. It is also possible to make the vehicle 100 a various mobile body other than the vehicle 100. A "mobile body" means an object that can move. Mobile bodies include ships, aircraft, robots, and maglev trains. In this case, the expressions "vehicle" and "car" in this disclosure can be replaced with "mobile body" as appropriate, and the expression "driving" can be replaced with "moving" as appropriate.

[0054] (B5) In the above embodiment, an example was shown in which the control unit 612 determines the target charge rate of the central storage battery 80. In contrast, the control unit 612 may determine the target charge rate of the central storage battery 80 by determining information equivalent to the charge rate of the battery 120, such as the amount of energy stored in the battery 120, electrical capacity, amount of electricity, cell voltage of the battery 120, and cell current of the battery 120, not limited to the charge rate alone.

[0055] The control and methods described herein may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the control and methods described herein may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the control and methods described herein may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0056] This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be replaced or combined as appropriate in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of symbols]

[0057] 50…Front-end process, 60…Back-end process, 70…Access point, 72…Network, 80…Central battery, 82…Auxiliary battery, 90…Power generation equipment, 100…Vehicle, 120…Battery, 140…Motor, 150…Power receiving circuit, 152…Power receiver, 154…Power receiving resonant circuit, 160…Power transmission circuit, 164…Power transmission resonant circuit, 180…ECU, 190…Vehicle communication unit, 200, 200A, 200B…Charging device, 250…Power transmission circuit, 250A…Power transmission device A, 254…Power transmission resonant circuit, 260…Power receiving circuit, 260A…Power receiving device 264…Power receiving resonant circuit, 300…Remote control device, 310…CPU, 312…Remote control unit, 314…Charge rate acquisition unit, 320…Storage device, 390…Remote communication unit, 400…Process control device, 500…Charging device management device, 600…Power supply and demand adjustment device, 610…CPU, 612…Control unit, 620…Storage device, 690…Communication unit, 800…Power supply and demand system, CA…Camera, FC…Factory, OS…Operator, PA…Shipping area, RT…Track, S1…Operator, S2…Renewable energy power generation business operator, S3…General consumer

Claims

1. A power supply and demand system used in a factory that manufactures vehicles, In the manufacturing process of the aforementioned factory, an on-board secondary battery is installed in the vehicle that can travel within the factory by remote control, A central battery capable of supplying power to the equipment of the aforementioned factory, A charging device capable of supplying power stored in the central storage battery to the on-board secondary battery, A power receiving device capable of supplying power stored in the on-board secondary battery to the central battery, A power generation facility installed in the aforementioned factory, the power generation facility capable of supplying the electricity generated by the power generation facility to the central battery, The system includes a control unit that acquires the trends in the amount of power generated by the power generation equipment and the trends in the power consumption of the central battery, and uses the acquired trends in the amount of power generated by the power generation equipment and the trends in the power consumption of the central battery to determine the target charge level of the central battery. Electricity supply and demand system.

2. The power supply and demand system according to claim 1, wherein the control unit determines the target charge rate of the central battery using the trend in the number of vehicles produced at the factory.

3. The power supply and demand system according to claim 1, wherein the control unit prompts the charging device to charge the on-board secondary battery when the charge level of the central storage battery is above a predetermined upper limit or is expected to be above the upper limit.

4. A power supply and demand system according to claim 1, The control unit prompts charging from the on-board secondary battery to the central battery via the power receiving device when the charge level of the central battery is below a predetermined lower limit or is predicted to fall below the lower limit. Electricity supply and demand system.

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