Photovoltaic power generation system and control device

Abstract

To provide a photovoltaic power generation system and a control device which suppress poor growth of a field crop and fluctuation in power supply amount.SOLUTION: A photovoltaic power generation system comprises: a first photovoltaic power generation device equipped with a first solar panel which is connected to a load on a consumer side, and arranged above a farmland, and an operation mechanism which operates the first solar panel such that the first solar panel shields the farmland; a first power conversion device arranged between the first solar panel and the load; a power storage device connected to the first power conversion device; a first measurement part which measures a first power generation amount generated by the first solar panel; a second measurement part which measures the temperature of the farmland; and a control part which controls the first power conversion device so as to supply at least a part of electric power generated by the first solar panel to the power storage device on the basis of the total power generation amount including the first power generation amount, and controls an action of the operation mechanism on the basis of the temperature of the farmland measured by the second measurement part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] There is a photovoltaic power generation system provided with solar panels that are also used as a means for adjusting the amount of sunlight that falls on agricultural crops grown on farmland. Patent Document 1 discloses a photovoltaic power generation system that determines, based on the temperature of the farmland, that high-temperature damage will occur to the crops grown on the farmland, and when it is determined that it is not nighttime, operates solar panels installed above the farmland so as to increase the area of ​​the shadow cast on the farmland. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 073779 Summary of the Invention [Problem to be solved by the invention]

[0004] The amount of power generated by a solar power generation system fluctuates depending on weather and other meteorological conditions. Therefore, the amount of power supplied from the solar power generation system may fluctuate depending on the fluctuations in the amount of power generated by the solar power generation system. For solar power generation systems installed on agricultural land, it is also necessary to suppress fluctuations in the amount of power supplied.

[0005] The present disclosure provides a photovoltaic power generation system and a control device that suppresses damage to crop growth and fluctuations in the amount of power supply. [Means for solving the problem]

[0006] In a first aspect, the system includes a first solar power generation device comprising: a first solar panel connected to a load on the consumer side and placed above farmland; and an operating mechanism for operating the first solar panel so that the first solar panel shades the farmland; a first power conversion device placed between the first solar panel and the load; a power storage device connected to the first power conversion device; a first measurement unit for measuring a first amount of power generated by the first solar panel; a second measurement unit for measuring the temperature of the farmland; and a control unit for controlling the first power conversion device to supply at least a portion of the power generated by the first solar panel to the power storage device based on a total amount of power generation including the first amount of power generation, and for controlling the operation of the operating mechanism based on the temperature of the farmland measured by the second measurement unit.

[0007] In a second aspect, a control device is provided that controls at least a first power conversion device that is placed between a first solar panel placed above farmland and a load on the consumer side and connected to a power storage device, and an operating mechanism that operates the first solar panel so that the first solar panel shades the farmland, wherein the control device controls the first power conversion device to supply at least a portion of the electricity generated by the first solar panel to the power storage device based on the total power generation amount including the first power generation amount generated by the first solar panel, and controls the operating mechanism based on the temperature of the farmland. [Effects of the Invention]

[0008] According to the technology of the present disclosure, it is possible to suppress damage to crop growth and fluctuations in the amount of power supply. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a system configuration diagram that is a schematic diagram illustrating an example of the overall configuration of a solar power generation system according to an embodiment. [Figure 2] 1 is a schematic perspective view showing a configuration example of a first solar power generation device of a solar power generation system according to an embodiment. FIG. [Figure 3]FIG. 2 is a block diagram showing a configuration example of a control unit of the solar power generation system according to the embodiment. [Figure 4] 4 is a flowchart showing an example of an operation when controlling a charge / discharge operation of a power storage device in a solar power generation system according to an embodiment. [Figure 5] 4 is a flowchart showing an example of an operation when controlling an operating mechanism in the solar power generation system according to the embodiment. [Figure 6] 5 is a flowchart showing an example of an operation when controlling a cooling mechanism in the solar power generation system according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a solar power generation system 1 according to an embodiment will be described with reference to the drawings. Note that "connection" is not limited to physical connection, but may also mean electrical connection. For example, connecting an object A to an object B is not limited to the case where the object A is conductively connected to the object B (for example, at the same potential), but may also include the case where the object A is conductively connected to the object B via the object C.

[0011] <Overall structure> 1 to 3, a configuration example of a solar power generation system 1 according to an embodiment is shown. FIG. 1 is a schematic system configuration diagram showing an example of the overall configuration of the solar power generation system 1 according to an embodiment. FIG. 2 is a schematic perspective view showing an example of the configuration of a first solar power generation device 10 of the solar power generation system 1 according to an embodiment. FIG. 3 is a block diagram showing an example of the configuration of a control unit 60 of the solar power generation system 1 according to an embodiment. The control unit 60 is an example of a "control device."

[0012] As shown in FIG. 1 , the solar power generation system 1 includes a first solar power generation device 10, a first power conversion device 20, a power storage device 30, a first measurement unit 40, a second measurement unit 50, and a control unit 60. The solar power generation system 1 may further include other components such as a cooling mechanism 71, a second power conversion device 73, a second solar power generation device 80, a third measurement unit 83, and a third power conversion device 85. These components included in the solar power generation system 1 may form a power transmission and distribution network called a microgrid. Hereinafter, the power transmission and distribution network including the solar power generation system 1 will be simply referred to as the "power transmission and distribution network."

[0013] An example of a destination of the power generated in the solar power generation system 1 is a load 3 operating in a customer's facility 2. An example of the customer's facility 2 is production equipment such as a factory. However, the customer's facility 2 is not limited to this. Another example of the load 3 is an electric motor such as a motor for driving various mechanical devices installed in the facility 2. However, the load 3 is not limited to this. Also, the number of loads 3 shown in the figure is three, but is not limited to this.

[0014] As shown in Fig. 1, a first solar panel 11 of a first solar power generation device 10 and a load 3 are connected to each other via an electric line such as a power transmission line. A distribution board 4 that distributes power to devices in a facility 2 including the load 3 is preferably disposed between the first solar panel 11 and the load 3. The load 3 is also connected to a second solar power generation device 80 and receives power generated by a second solar panel 81 of the second solar power generation device 80. The second solar power generation device 80 is disposed, for example, on the premises or on a building within the facility 2. However, the location of the second solar power generation device 80 is not limited thereto.

[0015] <First solar power generation device 10> Next, a configuration example of the first solar power generation device 10 will be described. As shown in FIG. 2, the first solar power generation device 10 is a solar power generation device installed on farmland 10L. The farmland 10L shown in the figure includes a paddy field where rice is grown as the farm crop 10C, and a field where wheat, soybeans, chives, etc. are grown as the farm crop 10C. However, the farmland 10L may also be farmland where other farm crops 10C are grown. The farm crop 10C grown on the farmland 10L will be referred to as "farm crop 10C" hereinafter.

[0016] The first solar power generation device 10 includes a first solar panel 11 and an operating mechanism 12. Preferably, the first solar power generation device 10 further includes a support mechanism 13 that supports the first solar panel 11 (see FIG. 2). The support mechanism 13 includes, for example, a support column 131, a beam portion 132, and an axial member 133. The axial member 133 is rotatably attached to the beam portion 132 and supports the first solar panel 11. However, the configuration of the support mechanism 13 is not limited to this.

[0017] The first solar panel 11 is connected to a load 3 on the consumer side. The first solar panel 11 is also installed above the farmland 10L. The first solar panel 11 is a flat-plate member having a photoelectric conversion unit on its main surface that receives sunlight and converts the light energy of the received sunlight into electric power. In the example shown in FIG. 2, the first solar power generation device 10 includes a plurality of first solar panels 11 arranged along both the width and depth directions above the farmland 10L.

[0018] The amount of power generated by the first solar panel 11 in response to received sunlight is referred to as the "first amount of power generation." When the first solar power generation device 10 includes multiple first solar panels 11 as shown in FIG. 2, the "first amount of power generation" corresponds to the total amount of power generated by each of the multiple first solar panels 11. It is preferable that each of the wires extending from the multiple first solar panels 11 is connected to a connection means such as a connection box installed near the first solar panel 11. The connection box is arranged in an electric path connecting the first solar panel 11 and the load 3.

[0019] First solar panel 11 shades at least a portion of farmland 10L. By first solar panel 11 shading at least a portion of farmland 10L, the amount of sunlight on crop 10C is reduced, and the growth temperature of crop 10C can be lowered.

[0020] Examples of the shading operation of the first solar panel 11 include the following. For example, when the sun is at meridian altitude, if the first solar panel 11 is operating and the orientation of the first solar panel 11 becomes approximately horizontal or nearly horizontal with respect to the farmland 10L, the first solar panel 11 covers the farmland 10L and shades most of the farmland 10L. This increases the area of ​​the shadow cast on the farmland 10L, reducing the amount of sunlight on the crops 10C. As a result, the growth temperature of the crops 10C can be lowered. In contrast, if the first solar panel 11 is operating so as to increase its inclination with respect to the farmland 10L, the shading rate decreases. In other words, the area of ​​the shadow cast on the farmland 10L decreases. As a result, the amount of sunlight on the crops 10C increases and the growth temperature of the crops 10C rises. Furthermore, when the sun's altitude is not at meridian altitude, if the angle of incidence of the sun's rays on the first solar panel 11 becomes approximately perpendicular, most of the farmland 10L can be shaded. On the other hand, the shading rate decreases as the angle of incidence of light from the sun on the first solar panel 11 becomes smaller or larger than perpendicular. Note that the first solar panel 11 may be provided with a member for increasing the shading rate, such as an extension plate that can be extended along the extension direction of the first solar panel 11.

[0021] Here, "shading rate" refers to the percentage of the area of ​​the shadow cast on the farmland 10L relative to the area of ​​the farmland 10L. When the first solar panel 11 shades the farmland 10L and casts a shadow over the entire area of ​​the farmland 10L, the shading rate is 100%. In contrast, when no shadow of the first solar panel 11 is cast on the farmland 10L, the shading rate is 0%. The shading rate changes depending on the tilt angle of the first solar panel 11 relative to the farmland 10L (hereinafter referred to as "tilt angle of the first solar panel 11").

[0022] The tilt angle when the first solar panel 11 is horizontal to the farmland 10L is defined as "0°." The tilt angle when the first solar panel 11 is perpendicular to the farmland 10L is defined as "90°." When adjusting the shading rate, the accuracy of adjusting the shading rate can be further improved by taking into account the altitude and azimuth angle of the sun.

[0023] The operating mechanism 12 operates the first solar panel 11 so that the first solar panel 11 shades the farmland 10L. An example of the operating mechanism 12 is an actuator such as a motor. The operating mechanism 12 is attached to, for example, an axis member 133 of the support mechanism 13. The axis member 133 rotates in response to the rotation of the operating mechanism 12. This causes the first solar panel 11 to rotate, and the tilt angle of the first solar panel 11 can be changed. As a result, the shading rate can be adjusted. However, the configuration and arrangement of the operating mechanism 12 are not limited to this.

[0024] Operating mechanism 12 operates first solar panel 11, thereby adjusting the tilt angle and shading rate of first solar panel 11. By increasing the shading rate, the growth temperature of crop 10C can be lowered even when crop 10C is exposed to a growing environment with high daytime temperatures. This makes it possible to suppress high-temperature damage to crop 10C. Note that examples of high-temperature damage when crop 10C is rice include white immature rice and poor ripening. Increasing the shading rate can reduce the probability of high-temperature damage, such as white immature rice and poor ripening. Meanwhile, growth damage to crop 10C when crop 10C receives insufficient sunlight can be addressed by, for example, bringing the tilt angle of first solar panel 11 closer to 90° and reducing the shading rate.

[0025] The operating mechanism 12 may operate the first solar panel 11 so that the photoelectric conversion unit of the first solar panel 11 tracks the sun in accordance with changes in the altitude and azimuth angle of the sun. The operating mechanism 12 may also operate the first solar panel 11 for another purpose.

[0026] Examples of operation modes of the operating mechanism 12 include a shading rate adjustment mode and a sun tracking mode. The shading rate adjustment mode is an operation mode in which the first solar panel 11 is operated to adjust the shading rate. The shading rate adjustment mode may include a "strong shading mode" in which the degree of shading is relatively increased depending on the magnitude of the shading rate, and a "weak shading mode" in which the degree of shading is relatively decreased. The range of the shading rate in the strong shading mode may be set as appropriate. Examples of the range of the shading rate in the strong shading mode include shading rate ranges of 30% to 100%, 40% to 90%, and 50% to 80%. The range of the shading rate in the weak shading mode may be set as appropriate. Examples of the range of the shading rate in the weak shading mode include shading rate ranges of 0% to 10%, 10% to 25%, and 15% to 45%. However, the shading rate in the weak shading mode does not exceed the shading rate in the strong shading mode. The sun tracking mode is an operation mode in which the first solar panel 11 is operated to track the sun.

[0027] <First power conversion device 20> Next, a configuration example of the first power conversion device 20 will be described. The first power conversion device 20 is disposed between the first solar panel 11 and the load 3. The first power conversion device 20 is connected to the first solar panel 11 and also to the load 3. The first power conversion device 20 is also connected to the power storage device 30. That is, the first solar panel 11, the load 3, and the power storage device 30 are connected to each other via the first power conversion device 20.

[0028] The first power conversion device 20 is preferably a so-called hybrid power conditioner that integrally includes a component that adjusts the power and voltage value generated by the first solar panel 11 and a component that adjusts the power and voltage value charged to and discharged from the power storage device 30. However, the first power conversion device 20 is not limited to a hybrid power conditioner. For example, the first power conversion device 20 may be a combination of multiple power conversion devices, including a power conditioner that adjusts the power and voltage value generated by the first solar panel 11 and another power conditioner that adjusts the power and voltage value charged to and discharged from the power storage device 30.

[0029] The first power conversion device 20 includes power supply circuits such as an inverter circuit and a converter circuit. The inverter circuit of the first power conversion device 20 converts DC power, including, for example, power generated by the first solar panel 11 and power discharged from the power storage device 30, into AC power. The first power conversion device 20 supplies the AC power converted by the inverter circuit to the load 3. The converter circuit of the first power conversion device 20 also increases or decreases the voltage value of the DC power generated by the first solar panel 11. The first power conversion device 20 supplies the DC power having a voltage value increased or decreased by the converter circuit to the power storage device 30.

[0030] <Electricity storage device 30> Next, a configuration example of the power storage device 30 will be described. The power storage device 30 is connected to the first power conversion device 20. At least a portion of the power generated by the first solar panel 11 is supplied to the power storage device 30 through the first power conversion device 20. The power storage device 30 is charged with the power supplied through the first power conversion device 20. In contrast, power discharged from the power storage device 30 is supplied to the load 3, for example, through the first power conversion device 20. However, the supply destination of the power discharged from the power storage device 30 is not limited to the load 3. The power discharged from the power storage device 30 may be supplied to, for example, the operating mechanism 12 of the first solar power generation device 10 or the cooling mechanism 71. Note that, as an operation mode of the power storage device 30, an operation mode in which power is charged may be referred to as a "charging mode." Furthermore, an operation mode in which power is discharged may be referred to as a "discharging mode."

[0031] Examples of the storage battery built into the power storage device 30 include a lithium ion battery, a lead storage battery, and a nickel-metal hydride battery. However, the type of storage battery built into the power storage device 30 is not limited to these. The number of storage batteries built into the power storage device 30 is also not limited.

[0032] <Various measuring units> Next, configuration examples of various measurement units including the first measurement unit 40 and the second measurement unit 50 will be described. The first measurement unit 40 measures the first amount of power generated by the first solar panel 11. Examples of the first measurement unit 40 include electrical measurement units such as a current sensor, a voltage sensor, and a watt-hour meter that are arranged between the first solar panel 11 and the load 3 or inside the first power conversion device 20. The first measurement unit 40 outputs an electrical signal indicating the measured first amount of power generation to the control unit 60. However, the first measurement unit 40 is not limited to these.

[0033] The second measurement unit 50 measures the temperature of the farmland 10L. An example of the second measurement unit 50 is a temperature sensor that measures the temperature around the farmland 10L. However, the second measurement unit 50 is not limited to this. The second measurement unit 50 sequentially measures the temperature around the farmland 10L, for example, at a predetermined time interval. The second measurement unit 50 sequentially outputs electrical signals indicating the sequentially measured temperatures around the farmland 10L to the control unit 60. The temperature measured by the second measurement unit 50 may be considered the growth temperature of the crop 10C.

[0034] In addition to the second measurement unit 50, other measurement units such as an illuminance sensor 51 and a camera 52 may be provided near the farmland 10L. The illuminance sensor 51 measures the illuminance of sunlight irradiating the farmland 10L. Preferably, the illuminance sensor 51 sequentially measures the illuminance of the farmland 10L at predetermined time intervals. The illuminance sensor 51 sequentially outputs electrical signals indicating the measured illuminance to the control unit 60. The illuminance measured by the illuminance sensor 51 may be converted into the amount of sunlight on the farmland 10L or the crops 10C. The hours of sunlight on the farmland 10L or the crops 10C may be calculated based on the illuminance measured by the illuminance sensor 51. The process of converting the amount of sunlight on the farmland 10L or the crops 10C and the process of calculating the hours of sunlight may be performed by the illuminance sensor 51 or the control unit 60.

[0035] Camera 52 captures images or videos of farmland 10L including crop 10C. Camera 52 may capture images of farmland 10L at any timing. For example, camera 52 may sequentially capture images of farmland 10L at predetermined time intervals. Camera 52 sequentially outputs electrical signals representing the captured images to control unit 60. If farmland 10L is a paddy field or a field, the heading time of rice as crop 10C or the flowering time of wheat, soybeans, chives, etc. as crop 10C can be identified based on the images captured by camera 52. The heading time of rice or the flowering time of wheat, soybeans, chives, etc. may be identified by image processing performed by camera 52 or control unit 60. Hereinafter, the heading time of rice grown in a paddy field and the flowering time of crops grown in a field may be collectively referred to as the "heading time, etc." Furthermore, information indicating the heading time, etc. may be referred to as "heading information, etc."

[0036] <Cooling mechanism> Next, the configuration of cooling mechanism 71 will be described. Cooling mechanism 71 cools crop 10C. It is preferable that cooling mechanism 71 operates mainly at night. When the nighttime temperature in farmland 10L is high, the possibility of high-temperature damage such as white immature rice and poor ripening increases, just as when the daytime temperature is high. By operating cooling mechanism 71 at night when first solar panel 11 is not generating electricity, the growth temperature of crop 10C can be constantly lowered. However, cooling mechanism 71 may operate not only at night but also during the day.

[0037] Examples of cooling mechanism 71 include an air blower such as a circulator, a water spray mechanism, a heat pump, and an irrigation water supply mechanism (a water supply pump, a gate mechanism that supplies irrigation water to farmland 10L, etc.). However, the configuration of cooling mechanism 71 is not limited to these. Cooling mechanism 71 may also be a device that lowers the growth temperature of crops 10C by lowering the soil, water temperature, ambient temperature, etc. of farmland 10L.

[0038] 1, the cooling mechanism 71 is preferably connected to the power storage device 30. That is, the cooling mechanism 71 is preferably operated by power discharged from the power storage device 30. This allows the cooling mechanism 71 to operate without the need for a separate power supply dedicated to operating the cooling mechanism 71. As a result, costs can be reduced.

[0039] <Second power conversion device 73> The second power conversion device 73 is disposed between the power storage device 30 and the cooling mechanism 71. The second power conversion device 73 is connected to both the power storage device 30 and the cooling mechanism 71. The second power conversion device 73 may also be connected to the operation mechanism 12 of the first solar power generation device 10. It is preferable that the power storage device 30, the cooling mechanism 71, and the operation mechanism 12 are connected to each other via the second power conversion device 73.

[0040] The second power conversion device 73 includes an inverter circuit that converts DC power discharged from the power storage device 30 into AC power, and a converter circuit that increases or decreases the voltage value of the DC power discharged from the power storage device 30. For example, from the viewpoint of space saving, the second power conversion device 73 is preferably a power conditioner that integrally includes a component that converts the power and voltage value supplied to the cooling mechanism 71 and a component that converts the power and voltage value supplied to the operating mechanism 12. However, the second power conversion device 73 may also be a combination of multiple power conditioners, such as a power conditioner that converts the power and voltage value supplied to the cooling mechanism 71 and another power conditioner that converts the power and voltage value supplied to the operating mechanism 12.

[0041] <Second solar power generation device 80> The second solar power generation device 80 is provided, for example, in a customer facility 2. The second solar power generation device 80 includes a second solar panel 81. The second solar panel 81 is connected to the load 3, for example, via a third power conversion device 85 and a distribution board 4. The second solar power generation device 80 preferably includes a plurality of second solar panels 81.

[0042] The second solar panel 81 is a flat-plate member having a photoelectric conversion unit on its main surface that receives sunlight and converts the light energy of the received sunlight into electricity. The amount of power generated by the second solar panel 81 in response to received sunlight is referred to as the "second amount of power generation." The second amount of power generation generated by the second solar panel 81 is measured by the third measurement unit 83.

[0043] Examples of the third measurement unit 83 include an electrical measurement unit such as a current sensor, a voltage sensor, or a watt-hour meter that is arranged between the second solar panel 81 and the load 3 or inside the third power conversion device 85. The third measurement unit 83 outputs an electrical signal indicating the measured second power generation amount to the control unit 60. However, the third measurement unit 83 is not limited to these.

[0044] <Control unit 60> As shown in FIG. 1 , the control unit 60 is connected to the first power conversion device 20 and the first measurement unit 40, and controls the first power conversion device 20 to supply at least a portion of the power generated by the first solar panel 11 to the power storage device 30 based on the total power generation amount including the first power generation amount. The power generated by the first solar panel 11 that is not supplied to the power storage device 30 is supplied to the load 3 via the first power conversion device 20. This allows the power equivalent to the first power generation amount to be appropriately distributed between the load 3 and the power storage device 30 when the amount of sunlight on the farmland 10L is high and, for example, the first power generation amount exceeds the amount of power consumed by the load 3. Furthermore, when the amount of sunlight on the farmland 10L is low, the power stored in the power storage device 30 can be supplied to the load 3. As a result, fluctuations in the amount of power supplied from the solar power generation system 1 to the load 3 can be suppressed.

[0045] The control unit 60 is connected to each of the operating mechanism 12 and the second measurement unit 50, and controls the operation of the operating mechanism 12 based on the temperature of the farmland 10L measured by the second measurement unit 50. In the illustrated example, the power discharged from the power storage device 30 is supplied to the operating mechanism 12 and the cooling mechanism 71 through the second power conversion device 73. Therefore, it is preferable that the control unit 60 adjusts the amount of power supplied to the operating mechanism 12 and the cooling mechanism 71 through control of the second power conversion device 73.

[0046] The control unit 60 may be connected to each of the illuminance sensor 51, the camera 52, and the third measurement unit 83. The control unit 60 may control the first power conversion device 20 and the second power conversion device 73 based on the electrical signals output from the illuminance sensor 51, the camera 52, and the third measurement unit 83, respectively.

[0047] Next, a configuration example of the control unit 60 will be described. As shown in Fig. 3, the control unit 60 includes an arithmetic processing unit 61, a storage unit 62, and a communication unit 63. The arithmetic processing unit 61, the storage unit 62, and the communication unit 63 are connected to each other via a bus 68.

[0048] The arithmetic processing unit 61 is a processor that controls and processes various operations in the control unit 60. A CPU (Central Processing Unit) is an example of the arithmetic processing unit 61. The arithmetic processing unit 61 may also be configured with other electronic circuits that perform the same functions as a processor such as a CPU.

[0049] The storage unit 62 stores programs executed by the arithmetic processing unit 61 and various data required for executing the programs. An example of the storage unit 62 is a non-volatile storage medium such as a ROM (Read Only Memory).

[0050] The communication unit 63 is a communication interface equipped with components such as communication circuits and antennas for communicating with other components such as the operating mechanism 12, the first power conversion device 20, the first measurement unit 40, the second measurement unit 50, the illuminance sensor 51, the camera 52, the second power conversion device 73, and the third measurement unit 83, or with an information processing device such as an external server.

[0051] Next, various functions of the arithmetic processing unit 61 will be described. The arithmetic processing unit 61 functions as each of means such as an acquisition means 611, a total power generation amount calculation means 612, a charge / discharge control means 613, an average temperature calculation means 614, and an operating mechanism control means 615. The arithmetic processing unit 61 may also function as a cooling mechanism control means 616. The arithmetic processing unit 61 executes a program stored in the storage unit 62 to cause the control unit 60 to function as each of these means. The program may be provided by being stored in a computer-readable storage medium, or may be provided via a communication network such as the Internet.

[0052] The acquisition means 611 receives electrical signals from the first measurement unit 40, the second measurement unit 50, the illuminance sensor 51, the camera 52, the third measurement unit 83, etc. through the communication unit 63, and acquires various information related to the first power generation amount, the second power generation amount, the temperature, illuminance, images, etc. of the farmland 10L. In addition, the acquisition means 611 may acquire other information, such as weather information for the area including the farmland 10L, from an information processing device such as an external server.

[0053] The total power generation amount calculation means 612 calculates the total power generation amount including the first power generation amount generated by the first solar panel 11. When the solar power generation system 1 includes the second solar power generation device 80, the total power generation amount calculation means 612 calculates the total power generation amount by adding the second power generation amount generated by the second solar panel 81 to the first power generation amount. When the solar power generation system 1 includes power generation devices other than the first solar power generation device 10 and the second solar power generation device 80, the total power generation amount calculation means 612 calculates the total power generation amount by adding the power generation amounts generated by the other power generation devices to the first power generation amount and the second power generation amount.

[0054] The total power generation amount calculation means 612 may calculate the total power generation amount by referring to other information such as weather information for the area including the farmland 10L. That is, the total power generation amount may be an actual measured value of the first power generation amount, the second power generation amount, etc., or may be a predicted value based on the actual measured values ​​of the first power generation amount, the second power generation amount, etc. and weather information, etc.

[0055] The charge / discharge control means 613 controls the first power conversion device 20 to switch the power storage device 30 between a charge mode and a discharge mode based on a comparison result between the total power generation amount calculated by the total power generation amount calculation means 612 and a threshold value Th1. The threshold value Th1 is an example of a "first threshold value." The threshold value Th1 is a value that can be set appropriately. An example of the threshold value Th1 is 500 kWh.

[0056] If the total power generation amount is equal to or greater than the threshold value Th1 as a result of comparing the total power generation amount with the threshold value Th1, the charge / discharge control means 613 controls the first power conversion device 20 to operate the power storage device 30 in a charging mode. The first power conversion device 20 controlled by the charge / discharge control means 613 supplies at least a portion of the power generated by the first solar panel 11 to the power storage device 30.

[0057] At this time, depending on whether the total power generation amount is equal to or greater than a threshold Th11 that is greater than the threshold Th1, the charge / discharge control means 613 controls the first power conversion device 20 to adjust the charge rate, which is the rate of the charge amount charged to the power storage device 30 out of the first power generation amount. For example, when the total power generation amount is equal to or greater than the threshold Th11, the charge / discharge control means 613 controls the first power conversion device 20 so that the power storage device 30 charges with power corresponding to a relatively large first charge rate. The first charge rate is a value that can be set as appropriate. An example of the first charge rate is a charge rate between 10% and 20%. On the other hand, when the total power generation amount is below the threshold Th11, the charge / discharge control means 613 controls the first power conversion device 20 so that the power storage device 30 charges with power corresponding to a relatively small second charge rate. The second charge rate is a value that can be set as appropriate. An example of the second charge rate is a charge rate between 0% and 10%. This makes it possible to supply an appropriate amount of power to the power storage device 30 depending on the total power generation amount. As a result, it is possible to suppress fluctuations in the amount of power supplied to the load 3. An example of a method for adjusting the charge ratio in the first power conversion device 20 is a method for adjusting the time during which current is passed through an electric circuit in the first power conversion device 20 that connects the first solar panel 11 and the power storage device 30. However, the method for adjusting the charge ratio in the first power conversion device 20 is not limited to this.

[0058] On the other hand, when the total power generation amount is below the threshold value Th1 as a result of comparing the total power generation amount with the threshold value Th1, the charge / discharge control means 613 controls the first power conversion device 20 to operate the power storage device 30 in a discharge mode. Specifically, the charge / discharge control means 613 controls the first power conversion device 20 to energize an electric path in the first power conversion device 20 that connects the power storage device 30 and the load 3. This makes it possible to supply at least a part of the power that has been charged in the power storage device 30 to the load 3 even when the total power generation amount is small. As a result, it is possible to suppress fluctuations in the amount of power supplied to the load 3.

[0059] The average temperature calculation means 614 calculates the average temperature of the farmland 10L over a predetermined period of time (hereinafter referred to as the "average temperature") from multiple pieces of temperature information sequentially measured by the second measurement unit 50. Here, when the farmland 10L is a paddy field and the farm crop 10C grown in the farmland 10L is rice, the average temperature calculation means 614 calculates a first period from the rice heading time to the current time based on heading information indicating the heading time of the rice, as premise information for calculating the average temperature. Furthermore, when the farmland 10L is a field, the average temperature calculation means 614 may calculate the first period from the flowering time to the current time based on information indicating the flowering time of crops such as wheat, soybeans, and Chinese chives grown in the field, as premise information for calculating the average temperature. In other words, the average temperature calculation means 614 calculates the first period based on the heading information indicating the heading time. Furthermore, the average temperature calculation means 614 calculates the average temperature of the farmland 10L over the first period of time based on the temperatures of the farmland 10L sequentially measured by the second measurement unit 50. The first period is a value that can be set as appropriate. An example of the first period is a period of around 20 days. The method of acquiring the information on heading, etc., which indicates the time of heading, etc., is arbitrary. For example, the information on heading, etc., may be acquired by analyzing images or videos captured by the camera 52. Furthermore, the information on heading, etc., entered into an information processing terminal by the manager of the farmland 10L, etc., may be acquired via the communication unit 63.

[0060] The operating mechanism control means 615 controls the operation of the operating mechanism 12 based on the comparison result between the average temperature calculated by the average temperature calculation means 614 and a threshold value Th2. The threshold value Th2 is a value that can be set appropriately. An example of the threshold value Th2 is 20°C. The threshold value Th2 is an example of a "second threshold value."

[0061] When the average temperature is below threshold Th2 as a result of comparing the average temperature with threshold Th2, operating mechanism control means 615 may operate operating mechanism 12 in the weak shading mode of the shading rate adjustment mode. For example, even when the average temperature is low enough to be below threshold Th2, growth impairment of crop 10C may occur. Therefore, when the average temperature is below threshold Th2, by reducing the shading rate and increasing the amount of sunlight reaching farmland 10L, it is possible to suppress growth impairment of crop 10C that may occur at low temperatures.

[0062] When the average temperature exceeds a threshold value Th3, which is greater than the threshold value Th2, as a result of comparing the average temperature with the threshold value Th2, the operating mechanism control means 615 may operate the operating mechanism 12 in a strong shading mode of the shading rate adjustment mode. The threshold value Th3 is a value that can be set as appropriate. An example of the threshold value Th3 is 26°C. The threshold value Th3 is an example of a "third threshold." For example, when the average temperature is high, such as being equal to or greater than the threshold value Th3, the shading rate can be increased and the amount of sunlight reaching the farmland 10L can be reduced, thereby suppressing growth disorders of the crops 10C that may occur at high temperatures.

[0063] Furthermore, operating mechanism control means 615 may operate operating mechanism 12 in the sun tracking mode when the average temperature is equal to or greater than threshold value Th2 and equal to or less than threshold value Th3. When the average temperature is within the range of equal to or greater than threshold value Th2 and equal to or less than threshold value Th3, it is assumed that the temperature is suitable for growing crop 10C. Operating mechanism control means 615 can appropriately switch between the shading rate adjustment mode and the sun tracking mode depending on the degree of need to suppress growth disorders of crop 10C. However, when the average temperature is equal to or greater than threshold value Th2 and equal to or less than threshold value Th3, operating mechanism control means 615 may operate operating mechanism 12 in another operating mode, such as the shading rate adjustment mode.

[0064] For example, if the average temperature is equal to or greater than threshold value Th2 and equal to or less than threshold value Th3, the operating mechanism control means 615 may further execute the following processing. That is, if the maximum temperature of the farmland 10L during a second period from a time after the heading time, etc., to the present time is equal to or greater than threshold value Th4, the operating mechanism control means 615 may operate the operating mechanism 12 in the strong shading mode of the shading rate adjustment mode. The second period is a value that can be set as appropriate. An example of the second period is any number of days between 5 and 10 days. The threshold value Th4 is a value that can be set as appropriate. An example of threshold value Th4 is 30°C. The threshold value Th4 is an example of a "fourth threshold value."

[0065] The operating mechanism control means 615 may operate the operating mechanism 12 in the weak shading mode of the shading rate adjustment mode when the average air temperature is equal to or greater than the second threshold and equal to or less than the third threshold, and the minimum air temperature of the farmland 10L during the second period is equal to or less than a threshold Th5 that is smaller than the threshold Th4. The threshold Th5 is a value that can be set as appropriate. An example of the threshold Th5 is 16°C. The threshold Th5 is an example of a "fifth threshold." The operating mechanism control means 615 may operate the operating mechanism 12 in the sun tracking mode when the maximum air temperature of the farmland 10L during the second period is below the threshold Th4 and the minimum air temperature of the farmland 10L during the second period is above the threshold Th5.

[0066] Even if the temperature environment can be determined to be appropriate for the growth of crop 10C from the perspective of the average temperature during the first period, operating mechanism control means 615 can control the operation of operating mechanism 12 by further referring to information indicating other temperature environments, such as the most recent maximum and minimum temperatures during the second period. This allows operating mechanism 12 to operate appropriately from the perspective of preventing damage to crop growth, even if the temperature during the second period suddenly rises or falls, for example.

[0067] The operating mechanism control means 615 may appropriately control the operation of the operating mechanism 12 based on other information, such as the amount of sunlight on the farmland 10L during a predetermined period, the temperature of the farmland 10L during periods other than the first period and the second period, etc. The operating mechanism control means 615 may communicate with a processing unit included in the operating mechanism 12 and directly control the operation of the operating mechanism 12. Alternatively, the operating mechanism control means 615 may indirectly control the operation of the operating mechanism 12 by controlling the second power conversion device 73 to adjust the power supply time of an electric circuit within the second power conversion device 73 connecting the power storage device 30 and the operating mechanism 12. For example, in the sun tracking mode, the operating mechanism control means 615 may control the operating mechanism 12 based on data on the tilt angle of the first solar panel 11 stored in the memory unit 62 or data on the tilt angle of the first solar panel 11 instructed from an external server via the communication unit 63. In the strong shading mode and the weak shading mode, the operating mechanism control means 615 may obtain data on the tilt angle of the first solar panel 11 corresponding to the shading rate of each mode from the memory unit 62 or from an external server via the communication unit 63, and control the operating mechanism 12.

[0068] The cooling mechanism control means 616 controls the second power conversion device 73 to operate the cooling mechanism 71 when it is determined that the current time is nighttime based on a timing means such as a timer built into the calculation processing unit 61 and illuminance information from the illuminance sensor 51, and when the temperature of the farmland 10L is equal to or higher than a threshold value Th6. The threshold value Th6 is a value that can be set as appropriate. An example of the threshold value Th6 is 27°C. The threshold value Th6 is an example of a "sixth threshold value."

[0069] When the cooling mechanism 71 is connected to the power storage device 30 through the second power conversion device 73, the cooling mechanism control means 616 controls the second power conversion device 73 to supply the electricity discharged from the power storage device 30 to the cooling mechanism 71 when it is currently nighttime and the temperature of the farmland 10L at the current time is higher than or equal to the threshold value Th6.

[0070] <Operation> Next, the operation of the solar power generation system 1 according to the embodiment will be described with reference to Fig. 4 to Fig. 6. Fig. 4 is a flowchart showing an example of the operation when controlling the charge / discharge operation of the power storage device 30 in the solar power generation system 1 according to the embodiment. Fig. 5 is a flowchart showing an example of the operation when controlling the operating mechanism 12 in the solar power generation system 1 according to the embodiment. Fig. 6 is a flowchart showing an example of the operation when controlling the cooling mechanism 71 in the solar power generation system 1 according to the embodiment.

[0071] <Control of charging and discharging operation of power storage device 30> 4, an example of the operation when controlling the charge / discharge operation of the power storage device 30 will be described. In step S11, the total power generation amount calculation means 612 of the control unit 60 calculates the total power generation amount including the first power generation amount generated by the first solar panel 11 and the second power generation amount generated by the second solar panel 81.

[0072] Subsequently, in step S12, the charge / discharge control means 613 of the control unit 60 compares the total power generation amount with a threshold value Th1 and determines whether the total power generation amount is equal to or greater than the threshold value Th1. If the charge / discharge control means 613 determines that the total power generation amount is equal to or greater than the threshold value Th1, it controls the first power conversion device 20 to operate the power storage device 30 in a charging mode.

[0073] Next, in step S13, the charge / discharge control means 613 compares the total power generation amount with a threshold value Th11 and determines whether the total power generation amount is equal to or greater than the threshold value Th11. If the charge / discharge control means 613 determines that the total power generation amount is equal to or greater than the threshold value Th11, in step S14, the charge / discharge control means 613 controls the first power conversion device 20 so that the power storage device 30 charges with power corresponding to a first charging rate. On the other hand, if the charge / discharge control means 613 determines that the total power generation amount is below the threshold value Th11, in step S15, the charge / discharge control means 613 controls the first power conversion device 20 so that the power storage device 30 charges with power corresponding to a second charging rate.

[0074] On the other hand, if the charge / discharge control means 613 determines in step S12 that the total power generation amount is below the threshold value Th1, then in step S16, the charge / discharge control means 613 controls the first power conversion device 20 to operate the storage device 30 in a discharge mode.

[0075] <Control of operating mechanism 12> Next, an example of the operation when controlling the operating mechanism 12 will be described with reference to Fig. 5. In step S21, the average temperature calculation means 614 of the control unit 60 calculates the average temperature of the farmland 10L during the first period from the time of heading etc. to the present time, based on the temperature information sequentially measured by the second measurement unit 50.

[0076] Subsequently, in step S22, the operating mechanism control means 615 of the control unit 60 compares the average temperature with the threshold value Th2, and determines whether or not the average temperature is lower than the threshold value Th2.

[0077] If the operating mechanism control means 615 determines that the average temperature is below threshold value Th2, then in step S23, it determines whether the average temperature for the last few hours (e.g., one hour) from the current point in time is below threshold value Th21. Here, threshold value Th21 is a value that can be set as appropriate. An example of threshold value Th21 is 16°C. If the operating mechanism control means 615 determines that the average temperature for the last few hours from the current point in time is below threshold value Th21, then in step S24, it causes the operating mechanism 12 to operate in the weak shading mode of the shading rate adjustment mode.

[0078] On the other hand, if the operating mechanism control means 615 determines in step S23 that the average temperature for the last few hours from the current time point is equal to or higher than the threshold value Th21, the operating mechanism control means 615 determines in step S25 whether the sunshine hours of the farmland 10L in the first time period satisfy the insufficient sunshine condition. An example of the insufficient sunshine condition is whether the sunshine hours of the farmland 10L in the first time period are 800 hours or less.

[0079] If the operating mechanism control means 615 determines that the sunshine hours of the farmland 10L in the first period satisfy the sunshine shortage condition, it controls the operating mechanism 12 to operate preferentially in the weak shading mode only during a predetermined time period within 24 hours from the current time in step S26. On the other hand, if the operating mechanism control means 615 determines that the sunshine hours of the farmland 10L in the first period do not satisfy the sunshine shortage condition (i.e., determines that there is no sunshine shortage), it controls the operating mechanism 12 to operate in the sun tracking mode in step S27.

[0080] On the other hand, if the operating mechanism control means 615 determines in step S22 that the average temperature is equal to or greater than the threshold value Th2, then in step S28 the operating mechanism control means 615 determines whether the average temperature is equal to or greater than a threshold value Th3. If the operating mechanism control means 615 determines that the average temperature is equal to or greater than the threshold value Th3, then in step S29 the operating mechanism control means 615 determines whether the average temperature for the last few hours (e.g., one hour) from the current point in time is equal to or greater than a threshold value Th31. Here, the threshold value Th31 is a value that can be set as appropriate. An example of the threshold value Th31 is 30°C. If the operating mechanism control means 615 determines that the average temperature for the last few hours from the current point in time is equal to or greater than the threshold value Th31, then in step S30 the operating mechanism 12 is operated in the strong shading mode of the shading rate adjustment mode. In contrast, in step S29, if the operating mechanism control means 615 determines that the average temperature for the last few hours from the current point in time is below the threshold value Th31, it executes a step similar to step S27 and operates the operating mechanism 12 in sun tracking mode.

[0081] If the operating mechanism control means 615 determines in step S28 that the average temperature is below threshold value Th3, then in step S31 the operating mechanism control means 615 determines whether the maximum temperature of the farmland 10L in the second period is equal to or higher than threshold value Th4. If the operating mechanism control means 615 determines that the maximum temperature of the farmland 10L in the second period is equal to or higher than threshold value Th4, it executes steps similar to those in step S29 and thereafter.

[0082] On the other hand, if the operating mechanism control means 615 determines in step S31 that the maximum temperature of the farmland 10L in the second period is below threshold value Th4, then in step S32 the operating mechanism control means 615 determines whether the minimum temperature of the farmland 10L in the second period is below threshold value Th5. If the operating mechanism control means 615 determines that the minimum temperature of the farmland 10L in the second period is below threshold value Th5, it executes steps similar to the steps from step S23 onwards. On the other hand, if the operating mechanism control means 615 determines in step S32 that the minimum temperature of the farmland 10L in the second period is equal to or higher than threshold value Th5, it executes steps similar to step S27 and controls the operating mechanism 12 to operate in sun tracking mode.

[0083] Note that the period of "several hours immediately preceding the present time" in step S23 is an example of a "third period." Furthermore, the period of "several hours immediately preceding the present time" in step S29 is an example of a "fourth period." The third period and the fourth period may be the same period or different periods. The third period and the fourth period are periods shorter than the second period.

[0084] <Control of cooling mechanism 71> Next, an example of the operation when controlling the cooling mechanism 71 will be described with reference to Fig. 6. In step S41, the cooling mechanism control means 616 of the control unit 60 determines whether or not it is currently nighttime based on information sequentially measured by a timing means such as a timer built into the arithmetic processing unit 61 and the illuminance sensor 51.

[0085] If the cooling mechanism control means 616 determines that the current time is nighttime, in step S42, it determines whether the temperature of the farmland 10L at the current time is higher than or equal to the threshold value Th6 based on the temperature information measured by the first measuring unit 40.

[0086] If cooling mechanism control means 616 determines that the current temperature of farmland 10L is equal to or higher than threshold value Th6, then in step S43, it outputs a control signal to second power conversion device 73 to supply power to cooling mechanism 71. As a result, power discharged from power storage device 30 is supplied to cooling mechanism 71 via second power conversion device 73. As a result, cooling mechanism 71 operates. By operating cooling mechanism 71 at night, the growth temperature of crop 10C can be lowered even if crop 10C is exposed to a high-temperature environment at night. This can further reduce damage to the growth of crop 10C.

[0087] When the cooling mechanism control means 616 determines that the temperature of the farmland 10L at the current time point is lower than the threshold value Th6, it does not output a control signal to the second power conversion device 73. In other words, the cooling mechanism 71 does not operate.

[0088] Although the embodiments have been described above, they are presented as examples and the present invention is not limited to the above embodiments. The above embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as set forth in the claims. [Explanation of symbols]

[0089] 1. Solar power generation system 2. Customer facilities 3. Load 4 Distribution board 10. First solar power generation device 10L farmland 10C Crops 11 First solar panel 12 Operating mechanism 13 Support mechanism 20 First power conversion device 30 Electricity storage device 40 First Measurement Section 50 Second Measurement Section 51 Illuminance sensor 52 Camera 60 Control Unit 71 Cooling mechanism 73 Second power conversion device 80 Second solar power generation device 83 Third Measurement Section 85 Third power converter

Claims

1. a first solar power generation device including a first solar panel connected to a load on a consumer side and arranged above farmland, and an operating mechanism that operates the first solar panel so that the first solar panel shades the farmland; a first power conversion device disposed between the first solar panel and the load; a power storage device connected to the first power conversion device; a first measurement unit that measures a first amount of power generated by the first solar panel; a second measuring unit that measures the temperature of the farmland; a control unit that controls the first power conversion device to supply at least a portion of the power generated by the first solar panel to the power storage device based on a total power generation amount including the first power generation amount, and that controls the operation of the operating mechanism based on the temperature of the farmland measured by the second measurement unit; A solar power generation system comprising:

2. the control unit controls the first power conversion device to discharge the power stored in the power storage device to the load based on the total power generation amount. The solar power generation system according to claim 1 .

3. The control unit total power generation amount calculation means for calculating the total power generation amount; a charge / discharge control means for controlling the first power conversion device to switch between a charge mode and a discharge mode of the power storage device based on a comparison result between the total power generation amount and a first threshold value; Equipped with The charge / discharge control means When the total power generation amount is equal to or greater than a first threshold, the first power conversion device is controlled to operate the power storage device in the charging mode and adjust a charging rate that is a rate of a charge amount to be charged to the power storage device out of the first power generation amount; When the total power generation amount is lower than the first threshold, the first power conversion device is controlled to operate the power storage device in the discharge mode. The solar power generation system according to claim 1 or 2.

4. a second solar power generation device including a second solar panel connected to the load; a third measurement unit that measures a second amount of power generated by the second solar panel; Furthermore, the total power generation amount calculation means calculates the total power generation amount including the first power generation amount and the second power generation amount. The solar power generation system according to claim 3 .

5. The agricultural land is a paddy field or a field, The control unit an average temperature calculation means for calculating a first period from the heading time, which is the heading time of rice grown in the paddy field or the flowering time of agricultural crops grown in the field, to a current time based on heading time, etc. information, and for calculating an average temperature of the agricultural land during the first period based on the temperature of the agricultural land measured by the second measurement unit; an operating mechanism control means for controlling the operation of the operating mechanism based on a comparison result between the calculated average temperature and a second threshold value; Equipped with The operating mechanism control means When the average temperature is lower than a second threshold, the operating mechanism is operated in a weak shading mode of a shading rate adjustment mode; When the average temperature exceeds a third threshold value that is greater than the second threshold value, the operating mechanism is operated in a strong shading mode of the shading rate adjustment mode; When the average temperature is equal to or higher than the second threshold value and equal to or lower than the third threshold value, the operating mechanism is operated in a sun tracking mode. The solar power generation system according to claim 1 or 2.

6. The operating mechanism control means When the average temperature is equal to or greater than the second threshold value and equal to or less than the third threshold value, and the maximum temperature of the farmland in a second period from a time point after the heading time, etc. to the current time point is equal to or greater than a fourth threshold value, the operating mechanism is operated in a strong shading mode of the shading rate adjustment mode, or When the average temperature is equal to or higher than the second threshold and equal to or lower than the third threshold, and the minimum temperature of the farmland during the second period is equal to or lower than a fifth threshold that is lower than the fourth threshold, the operating mechanism is operated in a weak shading mode of the shading rate adjustment mode. The solar power generation system according to claim 5 .

7. a cooling mechanism for cooling the farmland; a second power conversion device disposed between the power storage device and the cooling mechanism and connecting the power storage device and the cooling mechanism; Furthermore, the control unit controls the second power conversion device to supply the power discharged from the power storage device to the cooling mechanism when it is currently nighttime and the temperature of the farmland at the current time is equal to or higher than a sixth threshold. The solar power generation system according to claim 1 or 2.

8. A control device that controls at least a first power conversion device that is arranged between a first solar panel arranged above farmland and a load on a consumer side and is connected to a power storage device, and an operating mechanism that operates the first solar panel so that the first solar panel shades the farmland, The control device controlling the first power conversion device to supply at least a portion of the power generated by the first solar panel to a power storage device based on a total power generation amount including a first power generation amount generated by the first solar panel; Controlling the operating mechanism based on the temperature of the farmland. Control device.

9. controlling the first power conversion device to discharge the power stored in the power storage device to the load based on the total power generation amount; The control device according to claim 8.

10. total power generation amount calculation means for calculating the total power generation amount; a charge / discharge control means for controlling the first power conversion device to switch between a charge mode and a discharge mode of the power storage device based on a comparison result between the total power generation amount and a first threshold value; Equipped with The charge / discharge control means When the total power generation amount is equal to or greater than a first threshold, the first power conversion device is controlled to operate the power storage device in the charging mode and adjust a charging rate that is a rate of a charge amount to be charged to the power storage device out of the first power generation amount; When the total power generation amount is lower than the first threshold, the first power conversion device is controlled to operate the power storage device in the discharge mode. The control device according to claim 8 or 9.

11. the total power generation amount calculation means calculates the total power generation amount including the first power generation amount and a second power generation amount generated by a second solar panel connected to the load. The control device according to claim 10.

12. The agricultural land is a paddy field or a field, an average temperature calculation means for calculating a first period from the heading time, which is the time when rice grown in the paddy field or the flowering time of agricultural crops grown in the field, to a current time based on heading time information, and for calculating an average temperature of the agricultural land during the first period based on the temperature of the agricultural land; an operating mechanism control means for controlling the operating mechanism based on a comparison result between the calculated average temperature and a second threshold value; Equipped with The operating mechanism control means When the average temperature is lower than a second threshold, the operating mechanism is operated in a weak shading mode of a shading rate adjustment mode; When the average temperature exceeds a third threshold value that is greater than the second threshold value, the operating mechanism is operated in a strong shading mode of the shading rate adjustment mode; When the average temperature is equal to or higher than the second threshold value and equal to or lower than the third threshold value, the operating mechanism is operated in a sun tracking mode. The control device according to claim 8 or 9.

13. The operating mechanism control means When the average temperature is equal to or greater than the second threshold value and equal to or less than the third threshold value, and the maximum temperature of the farmland in a second period from a time point after the heading time, etc. to the current time point is equal to or greater than a fourth threshold value, the operating mechanism is operated in a strong shading mode of the shading rate adjustment mode, or When the average temperature is equal to or higher than the second threshold and equal to or lower than the third threshold, and the minimum temperature of the farmland during the second period is equal to or lower than a fifth threshold that is lower than the fourth threshold, the operating mechanism is operated in a weak shading mode of the shading rate adjustment mode. The control device according to claim 12.

14. When it is currently nighttime and the temperature of the farmland at the current time is equal to or higher than a sixth threshold, a second power conversion device that is disposed between the power storage device and the cooling mechanism and connects the power storage device and the cooling mechanism is controlled so as to supply the power discharged from the power storage device to a cooling mechanism that cools the farmland. The control device according to claim 8 or 9.

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