Control system

Abstract

To provide a control system that can grow crops in an optimal environment within a closed space while increasing an amount of electricity generated by solar power generation.SOLUTION: A control system 100 controls solar power generation by multiple solar panels 102. The multiple solar panels 102 are arranged at the top of a closed space. Crops are grown in the closed space. The control system 100 includes a saturation deficit acquisition unit 210b, a power generation amount acquisition unit 210c, and a panel control unit 210d. The saturation deficit acquisition unit 210b acquires the saturation deficit in the closed space. The power generation amount acquisition unit 210c acquires a power generation amount of the solar panels 102. The panel control unit 210d controls the spatial arrangement of the solar panels 102 based on the saturation deficit and the power generation amount.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a control system used for solar power generation.

Background Art

[0002] A solar sharing system is known in which solar power generation equipment is installed in the upper space of agricultural land and solar power generation is carried out while operating agriculture (Patent Document 1). Patent Document 1 describes that when the solar radiation amount is equal to or greater than the light saturation point of the crops cultivated in the farmland, the inclination angle of the light receiving surface of the solar panel with respect to the incident direction of sunlight is made closer to a right angle as compared with the case where the solar radiation amount is less than the light saturation point.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the photosynthesis amount of plants varies depending on the aperture of the stomata. The technique described in Patent Document 1 only assumes the control of the inclination angle of the solar panel based on the light saturation point. Even if the inclination angle of the solar panel is controlled based on the light saturation point, it is difficult to obtain a sufficient photosynthesis amount if the aperture of the stomata of the plants is small. Therefore, with the technique described in Patent Document 1, there is a risk that the crops cannot grow in a sufficient environment.

[0005] In addition, when the inclination angle of the solar panel is controlled based on the light saturation point, the inclination angle is different from the angle that maximizes the power generation amount. Therefore, with the technique described in Patent Document 1, there are cases where the power generation amount by the solar panel cannot be maximized.

[0006] Furthermore, in solar sharing using a greenhouse, it may be necessary to control the temperature inside the greenhouse to decrease. However, the technology described in Patent Document 1 does not assume decreasing the temperature inside the greenhouse in such a case.

[0007] In view of the above problems, an object of the present disclosure is to provide a control system that enables crops cultivated in a closed space to grow in a more suitable environment and increases the power generation amount by solar power generation.

Means for Solving the Problems

[0008] The gist of the present disclosure is as follows.

[0009] (1) The control system controls solar power generation by a plurality of solar panels. The plurality of solar panels are arranged on the upper part of a closed space. Crops are cultivated in the closed space. The control system includes a saturation deficit acquisition unit, a power generation amount acquisition unit, and a panel control unit. The saturation deficit acquisition unit acquires the saturation deficit inside the closed space. The power generation amount acquisition unit acquires the power generation amount of the solar panels. The panel control unit controls the spatial arrangement of the solar panels based on the saturation deficit and the power generation amount.

[0010] (2) In the control system according to (1) above, the panel control unit includes a panel position control unit and a panel angle control unit. The panel position control unit controls the position of the solar panels based on the saturation deficit. The panel position control unit changes the size of the light transmission region between adjacent solar panels. The panel angle control unit controls the tilt angle of the solar panels based on the power generation amount.

[0011] (3) In the control system according to (2) above, the panel position control unit makes the size of the light transmission region larger as the saturation deficit is smaller.

[0012] (4) In the above (2) or (3), the panel position control unit controls the position of the solar panel so as to reduce the difference between the saturation difference and the target value of the saturation difference corresponding to the crop cultivated in the closed space.

[0013] (5) The control system includes a ventilation control unit in any of the above (1) to (4). The ventilation control unit controls a ventilation device that ventilates the air inside the closed space and the air outside the closed space. The ventilation control unit increases the ventilation amount by the ventilation device as the saturation difference becomes smaller.

[0014] (6) The control system includes a mist spraying control unit in any of the above (1) to (5). The mist spraying control unit sprays mist inside the closed space. The mist spraying control unit increases the mist spraying amount by the mist spraying device as the saturation difference becomes larger.

[0015] (7) In the above (4), the panel angle control unit controls the tilt angle so that the power generation amount of the solar panel becomes larger in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value.

[0016] (8) In the above (7), the panel angle control unit controls the tilt angle so that the angle between the direction of solar radiation and the normal of the light receiving surface of the solar panel becomes smaller.

[0017] (9) In the above (4), the panel angle control unit controls the tilt angle so that the power generation amount of the solar panel becomes larger within a range where the solar radiation amount in the closed space does not exceed the light saturation point of the crop cultivated in the closed space in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value.

[0018] (10) In the above (9), the panel angle control unit controls the tilt angle of the solar panel so that the angle between the direction of solar radiation and the normal of the light receiving surface of the solar panel becomes smaller.

[0019] (11) In the above (4), when the deviation between the saturation difference and the target value is equal to or less than a predetermined value, the panel position control unit controls the position of the solar panel to change the size of the light transmission area, thereby controlling the temperature in the closed space to the target value determined according to the crop.

[0020] (12) In the above (5), when the deviation between the saturation difference and its target value is equal to or less than a predetermined value, the ventilation control unit controls the ventilation device, thereby controlling the temperature in the closed space to the target value determined according to the crop.

[0021] (13) In the above (6), when the deviation between the saturation difference and its target value is equal to or less than a predetermined value, the mist spraying control unit controls the mist spraying device, thereby further reducing the temperature of the solar panel and controlling the temperature in the closed space to the target value determined according to the crop.

Effect of the Invention

[0022] According to the present disclosure, an object of the present disclosure is to provide a control system capable of growing crops cultivated in a closed space in a more suitable environment and increasing the power generation amount by solar power generation.

Brief Description of the Drawings

[0023]

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[0024] Hereinafter, some embodiments according to the present disclosure will be described with reference to the drawings. However, these descriptions are intended to merely exemplify preferred embodiments of the present disclosure, and are not intended to limit the present disclosure to such specific embodiments. In the following description, similar components are given the same reference numerals, and duplicate descriptions will be omitted as appropriate.

[0025] As an example, as shown in FIG. 1, a solar power generation control system 100 according to the present embodiment includes a solar panel 102 and a storage battery 124, and is used in the form of a completely self-consumption on-site PPA. In the on-site PPA, a power generation company 300 installs the control system 100 on the premises of a consumer 350, and supplies power generated by the control system 100 to the consumer 350 on-site. The power generation company 300 and the consumer 350 enter into a power purchase agreement, i.e., a PPA. Based on the PPA, the power generation company 300 installs the control system 100, and also owns and manages the control system 100. Based on the PPA, the consumer 350 pays a power fee to the power generation company 300.

[0026] In the case of a completely self-consumption type, all the power generated by the control system 100 is self-consumed within the premises of the consumer 350. Therefore, the power generated by the control system 100 is supplied only to the facilities within the premises of the consumer 350, and the power is not supplied to the transmission network, distribution network, etc. of other power systems.

[0027] When the amount of power generated by the control system 100 is surplus with respect to the amount of power required by the consumer 350, the surplus is stored in the storage battery 124. And when the amount of power generated by the control system 100 is insufficient with respect to the amount of power required by the consumer 350, the shortage is compensated by the power stored in the storage battery 124. Also, the shortage may be compensated by the consumer 350 purchasing power from the existing power company 400.

[0028] As shown in FIG. 2, the control system 100 includes, for example, a solar panel 102, a junction box 104, a DC / AC high-frequency inverter 106, a high-frequency transformer 108, a leakage breaker 110, a power supply switch 112, an AC / DC converter 118, a battery power supply switch 120, a DC / DC converter 122, a battery 124, and a control device 200. Further, the control system 100 may further include a first motor 38, a second motor 39, a third motor 42, a fourth motor 44, various sensors 50, a ventilation device 60, a mist spraying device 70, a pressure pump 80, and electrical equipment 90. From the perspective of realizing the control according to the present embodiment, the control system 100 only needs to include the first motor 38, the second motor 39, the third motor 42, the fourth motor 44, various sensors 50, the ventilation device 60, the mist spraying device 70, and the control device 200. And other configurations of the control system 100 may be additional elements. In FIG. 2, the dashed arrows extending from the control device 200 to the power supply switch 112 and the battery power supply switch 120 indicate signal lines through which control signals for driving these switches are transmitted. Also, the solid arrows extending from the control device 200 to the first motor 38, the second motor 39, the third motor 42, and the fourth motor 44 indicate signal lines through which control signals for driving these motors are transmitted. Also, the solid arrows extending from the control device 200 to the ventilation device 60, the mist spraying device 70, and the pressure pump 80 indicate signal lines through which control signals for driving these devices are transmitted. Further, the solid arrow extending from the sensor 50 to the control device 200 indicates a signal line through which the detection signal of the sensor 50 is transmitted.

[0029] The solar panel 102 generates electricity by receiving sunlight. The solar panel 102 is composed of, for example, a plurality of solar cell modules, and each solar cell module is composed of a plurality of solar cells. The solar cells convert solar energy into electric power when irradiated with sunlight. The junction box 104 integrates, for example, the DC output generated by each solar cell module into one cable by taking out the output cables.

[0030] The DC / AC high-frequency inverter 106 converts the power generated by the solar panel 102 from DC to AC. The high-frequency transformer 108 transforms the AC converted by the DC / AC high-frequency inverter 106 to a desired voltage. The leakage breaker 110 cuts off the current when the AC current becomes excessive. The power supply switch 112 is composed of an electromagnetic switch and is a switch for supplying the power generated by the solar panel 102 to the electrical equipment 90. The electrical equipment 90 is equipment provided within the site of the consumer 350. The electrical equipment 90 can operate with the power generated by the solar panel 102. When the power supply switch 112 is turned on, power is supplied to the electrical equipment 90. On the other hand, when the power supply switch 112 is turned off, the power supply to the electrical equipment 90 is stopped.

[0031] The AC / DC converter 118 converts the AC transformed by the high-frequency transformer 108 to DC. The battery power supply switch 120 is composed of an electromagnetic switch and is a switch for supplying the surplus power to the battery 124 as needed. When the battery power supply switch 120 is turned on, power is supplied to the battery 124. On the other hand, when the battery power supply switch 120 is turned off, the power supply to the battery 124 is stopped. The DC / DC converter 122 performs voltage conversion to store the DC voltage converted by the AC / DC converter 118 in the battery 124. The battery 124 stores the surplus power generated by the solar panel 102 when the battery power supply switch 120 is on. The control system 100 according to the present embodiment is a fully self-consumption type, stores all the surplus power generated by the solar panel 102 in the battery 124, and does not sell electricity to the power company 400.

[0032] In this embodiment, a greenhouse 10 shown in FIG. 3 is installed within the site of the customer 350. As shown in FIG. 3, the greenhouse 10 is an enclosed space surrounded by side walls 12 and a roof 14. Crops are cultivated inside the greenhouse 10. The roof 14 of the greenhouse 10 is composed of a light-transmissive film. Sunlight passes through the light-transmissive film of the roof 14 and enters the interior of the greenhouse 10. Thereby, the temperature inside the greenhouse 10 can be raised. Note that the incident direction of sunlight is, in FIG. 3, perpendicular to the ground as an example and is indicated by a dashed arrow.

[0033] As shown in FIG. 3, the solar panel 102 is installed inside the greenhouse 10. The solar panel 102 is provided directly below the roof 14. The light-transmissive film constituting the roof 14 is replaced every predetermined period, for example, every one to several years. If the solar panel 102 is installed on the roof 14, it is necessary to remove the solar panel 102 when replacing the light-transmissive film, which causes an obstacle to the replacement work. In this embodiment, since the solar panel 102 is installed inside the greenhouse 10, the light-transmissive film can be easily replaced without removing the solar panel 102.

[0034] The greenhouse 10 includes a first solar power generation unit 20 and a second solar power generation unit 22. Note that the greenhouse 10 may include three or more solar power generation units. The first solar power generation unit 20 includes a plurality of solar panels 102. The solar panels 102 of the first solar power generation unit 20 are arranged at a predetermined interval along the inclined direction of the roof 14.

[0035] Similarly, the second solar power generation unit 22 includes a plurality of solar panels 102. The solar panels 102 of the second solar power generation unit 22 are arranged at a predetermined interval along the inclined direction of the roof 14, similar to the solar panels 102 of the first solar power generation unit 20.

[0036] Note that the intervals along the inclination direction of the roof 14 of the plurality of solar panels 102 of the first solar power generation unit 20 may be the same as the intervals along the inclination direction of the roof 14 of the plurality of solar panels 102 of the second solar power generation unit 22.

[0037] The first solar power generation unit 20 and the second solar power generation unit 22 are arranged in two upper and lower layers. The first solar power generation unit 20 is arranged in the upper layer than the second solar power generation unit 22. The solar panels 102 of the first solar power generation unit 20 and the solar panels 102 of the second solar power generation unit 22 are arranged such that a light-transmitting region through which sunlight passes is formed between adjacent edges in the inclination direction of the roof 14. For example, the solar panels 102 of the first solar power generation unit 20 and the solar panels 102 of the second solar power generation unit 22 are arranged such that an opening 24 through which sunlight passes is formed between adjacent edges.

[0038] The solar panels 102 of the second solar power generation unit 22 are movable relative to the solar panels 102 of the first solar power generation unit 20 in the inclination direction of the roof 14. Specifically, the solar panels 102 of the second solar power generation unit 22 are movable in the direction of arrow A1 shown in FIG. 3. When the solar panels 102 of the second solar power generation unit 22 move in the direction of arrow A1, the horizontal width W of the opening 24 changes. Thereby, the amount of solar radiation of the sunlight irradiated into the greenhouse 10 changes.

[0039] As shown in FIG. 4, the second solar power generation unit 22 includes a first guide rail 30 and a second guide rail 32. The first guide rail 30 and the second guide rail 32 are made of channel materials. The first guide rail 30 and the second guide rail 32 are arranged such that the channel-shaped recesses face each other. The longitudinal directions of the first guide rail 30 and the second guide rail 32 are arranged along the inclination direction of the roof 14. Both ends of the solar panel 102 in the direction orthogonal to the inclination direction of the roof 14 are inserted into the opposing recesses of the first guide rail 30 and the second guide rail 32. Thereby, the solar panel 102 is supported by the first guide rail 30 and the second guide rail 32. The solar panel 102 is configured to be slidable in the direction of arrow A1 with respect to the first guide rail 30 and the second guide rail 32.

[0040] In the inclination direction of the roof 14, a plurality of solar panels 102 are connected by a wire 34. Both ends of the wire 34 are wound around the first pulley 36 and the second pulley 37, respectively. Each of the first pulley 36 and the second pulley 37 at both ends of the wire 34 is driven by a first motor 38 and a second motor 39. When each of the first motor 38 and the second motor 39 drives the first pulley 36 and the second pulley 37 at both ends of the wire 34, the plurality of solar panels 102 slide simultaneously in the direction of arrow A1. The first motor 38 includes a first sensor 38a that detects the rotation angle of the first motor 38. The second motor 39 includes a second sensor 39a that detects the rotation angle of the second motor 39. Based on the correlation between the rotation angles of the first motor 38 and the second motor 39 and the width W of the opening 24, the width of the opening W is obtained from the rotation angles of the first motor 38 and the second motor 29.

[0041] In addition, the second solar power generation unit 22 includes a shaft 40 extending in a direction orthogonal to the inclination direction of the roof 14. The shaft 40 is fixed to the first guide rail 30 and the second guide rail 32. The shaft 40 is driven by a third motor 42. When the shaft 40 is driven by the third motor 42, the first guide rail 30 and the second guide rail 32 rotate in the direction of arrow A2 about the shaft 40. Further, the second solar power generation unit 22 includes a shaft 46 extending in the inclination direction of the roof 14. The shaft 46 is fixed to a pedestal 48 that supports the third motor 42. The shaft 46 is driven by a fourth motor 44. When the shaft 46 is driven by the fourth motor 44, the pedestal 48 rotates in the direction of arrow A3 about the shaft 46, and the third motor 42 and the shaft 40 also rotate in the direction of arrow A3 about the shaft 46. As a result, the first guide rail 30 and the second guide rail 32 rotate in the direction of arrow A3 about the shaft 46. As described above, by controlling the rotation angles of the two shafts, the shaft 40 and the shaft 46, the inclination angle of the solar panel 102 with respect to the incident direction of sunlight changes. The third motor 42 includes a third sensor 42a that detects the rotation angle of the third motor 42. Based on the correlation between the rotation angle of the third motor 42 and the inclination angle of the solar panel 102, the inclination angle of the solar panel 102 with the shaft 40 as the rotation center can be obtained from the rotation angle of the third motor 42. The fourth motor 44 includes a fourth sensor 44a that detects the rotation angle of the fourth motor 44. Based on the correlation between the rotation angle of the fourth motor 44 and the inclination angle of the solar panel 102, the inclination angle of the solar panel 102 with the shaft 46 as the rotation center can be obtained from the rotation angle of the fourth motor 44. In the following description, the inclination angle of the solar panel 102 is represented by the inclination angle with the shaft 40 as the rotation center and the inclination angle with the shaft 46 as the rotation center.

[0042] The solar panel 102 of the first solar power generation unit 20 is basically fixed to the greenhouse 10 so that it cannot move relative to the greenhouse 10. On the other hand, the first solar power generation unit 20 may be rotatable about a predetermined axis, similar to the second solar power generation unit 22. And it may be configured such that the tilt angle of the solar panel 102 with respect to the incident direction of sunlight changes accordingly. Also, the first solar power generation unit 20 may be configured such that the solar panel 102 is movable along the inclination direction of the roof 14, similar to the second solar power generation unit 22.

[0043] The various sensors 50 include sensors provided inside the greenhouse 10, such as a temperature sensor for detecting the temperature inside the greenhouse 10, a humidity sensor for detecting the relative humidity inside the greenhouse 10, and a pyranometer for detecting the solar radiation amount inside the greenhouse 10. Also, the various sensors 50 include sensors provided outside the greenhouse 10, such as an outside air temperature sensor. Further, the various sensors 50 include a first sensor 38a for detecting the rotation angle of the first motor 38, a second sensor 39a for detecting the rotation angle of the second motor 39, a third sensor 42a for detecting the rotation angle of the third motor 42, a sensor for detecting the temperature of the solar panel 102, and a sensor for detecting the power generation amount of the solar panel 102.

[0044] The ventilation device 60 ventilates the air inside the greenhouse 10 and the air outside the greenhouse 10. The ventilation device 60 is composed of, for example, a ventilation fan, and is configured to be able to control the ventilation amount by controlling the rotation amount of the ventilation fan. The ventilation device 60 may be configured to include a window provided on the side wall 12 or the roof 14 and a motor for opening and closing the window.

[0045] The mist spraying device 70 is provided inside the greenhouse 10. The mist spraying device 70 sprays mist inside the greenhouse 10 to lower the temperature inside the greenhouse 10. As an example, the mist spraying device 70 is a pressurized type device that sprays water compressed by a pressurizing pump 80 as mist from fine holes. By spraying the mist by the mist spraying device 70, fine water particles evaporate, and the temperature inside the greenhouse 10 decreases due to the heat of vaporization.

[0046] In addition, the mist spraying device 70 is capable of spraying mist on the lower surface of the solar panel 102. The power generation efficiency of the solar panel 102 decreases by approximately 0.5% for every 1°C increase in temperature when the temperature of the solar panel 102 is at or above the preferred temperature (25°C). Also, the power generation efficiency may decrease even at extremely low temperatures. Therefore, the mist spraying device 70 sprays mist on the lower surface of the solar panel 102 to maintain the temperature of the solar panel 102 at a temperature with higher power generation efficiency. Note that the mist spraying device 70 may spray warm water.

[0047] As shown in FIG. 3, a water storage tank 82 is buried underground around the greenhouse 10. Rainwater flowing down from the roof 14 is stored in the water storage tank 82. The rainwater stored in the water storage tank 82 is supplied to the mist spraying device 70 by the operation of a pressurizing pump 80. The pressurizing pump 80 compresses the rainwater stored in the water storage tank 82 and pumps it up to the height where the mist spraying device 70 is provided. Also, the pressurizing pump 80 pumps the rainwater to the mist spraying device 70 against the pressure loss due to the piping. The mist spraying device 70 sprays the rainwater pumped by the pressurizing pump 80 as mist.

[0048] In this embodiment, the mist spraying device 70 sprays rainwater, but the mist spraying device 70 may also spray tap water. When spraying mist by tap water pressure, the pressurizing pump 80 and the water storage tank 82 may not be provided.

[0049] The crops cultivated in the greenhouse 10 open the stomata on their leaves to absorb carbon dioxide, which is a material for photosynthesis. Also, the crops perform transpiration by opening the stomata on their leaves and release water vapor, that is, moisture, from the stomata. When the crops close the stomata to suppress transpiration in order to retain the moisture in their bodies, the amount of carbon dioxide absorbed decreases and photosynthesis is suppressed.

[0050] In this embodiment, attention is paid to the aperture of stomata for optimizing transpiration and carbon dioxide absorption, and the aperture of stomata is optimized. Crops adjust the aperture of stomata according to changes in environmental factors, and the most important environmental factor is the moisture state, that is, humidity. Therefore, the aperture of stomata varies greatly depending on humidity. From the perspective of promoting photosynthesis of crops and growing crops optimally, in order not to close the stomata, instead of humidity management based on relative humidity, management of vapor pressure deficit related to temperature and humidity is effective.

[0051] Therefore, in this embodiment, taking the optimal vapor pressure deficit corresponding to the crop as the target value, the environment in the greenhouse 10 is adjusted so that the vapor pressure deficit in the greenhouse 10 becomes the target value. More specifically, the environment in the greenhouse 10 is adjusted so that the deviation between the vapor pressure deficit and its target value is equal to or less than a predetermined value.

[0052] The vapor pressure deficit indicates the difference between the maximum amount of water vapor that a certain air can hold, that is, the saturated water vapor amount, and the absolute humidity, and is an index indicating how much room there is for a certain temperature of air to contain water vapor. On the other hand, relative humidity (%) is the ratio of the actual water vapor amount to the saturated water vapor amount.

[0053] The moisture state of plants is more strongly affected by the vapor pressure deficit than by relative humidity, and the optimal vapor pressure deficit for growth varies depending on the crop, but is generally about 3 to 7 g / m 3 or so. Under such conditions, the stomata open moderately and both photosynthesis and transpiration are promoted. When the vapor pressure deficit becomes larger than necessary, the transpiration amount becomes excessively large, the plant closes its stomata, and photosynthesis is suppressed. On the other hand, when the vapor pressure deficit becomes smaller than necessary, the air becomes excessively humid, and transpiration is less likely to occur even if the stomata are open.

[0054] More specifically, the optimal vapor pressure deficit for strawberry growth is about 3 to 5 g / m 3 or so, and the optimal vapor pressure deficit for tomato growth is 3 to 7 g / m 3This is the degree. When the saturation deficit becomes smaller than necessary under high humidity conditions, transpiration stops, causing an adverse effect on crop cultivation. For example, when the crop is a tomato, there is a problem that the water that should originally be transpired flows into the fruit, resulting in crop deterioration. Also, when transpiration stops, the flow of nutrient absorption in the crop's body stops, making it easier for nutrient deficiencies to occur. Further, for example, when the crop is a strawberry, the suppression of transpiration causes a decrease in calcium content, which is a factor in the occurrence of a physiological disorder called tip burn.

[0055] The relative humidity in the greenhouse 10 varies in the range of about 40 to 100% depending on factors such as the transpiration of the crop, the outside air temperature, the solar radiation amount, and the ventilation amount. It is extremely difficult to control only the humidity without affecting other environmental factors. Therefore, the management of the saturation deficit in relation to temperature and humidity is effective.

[0056] The saturation deficit is calculated from the following formulas (1) to (3) based on the air temperature [°C] and the relative humidity [%].

[0057]

Number

[0058] A map showing the values of the saturation deficit according to the air temperature [°C] and the relative humidity [%] is shown in FIG. 5. As described above, the optimal saturation deficit for tomato growth is 3 to 7 g / m 3 This is the degree. The range R1 of the saturation deficit appropriate for tomato growth, the range R2 of the saturation deficit with a larger transpiration amount than the range R1, and the range R3 of the saturation deficit with a more difficult transpiration than the range R1 are shown in FIG. 5. When the crop is a tomato, for example, by controlling the saturation deficit in the greenhouse 10 with the median value of the optimal saturation deficit range of 3 to 7 g / m 3 as the target value, the stomata of the tomato leaves open appropriately, promoting photosynthesis.

[0059] In addition, in the present embodiment, the inclination angle of the solar panel 102 is adjusted so that the power generation amount of the solar panel becomes maximum in a state where the saturation difference is controlled to a target value. As a result, the amount of solar radiation irradiated on the solar panel 102 increases, and the power generation amount of the solar panel 102, that is, the conversion efficiency from solar energy to electrical energy increases.

[0060] In addition, in the present embodiment, the inclination angle of the solar panel 102 is adjusted so that the amount of solar radiation in the greenhouse 10 is below the light saturation point of the crops cultivated in the greenhouse 10 in a state where the saturation difference is controlled to a target value. The light saturation point and the light compensation point of typical crops are shown in FIG. 6. For example, the light saturation point of strawberries is about 20,000 to 25,000 (LUX). Also, the light saturation point of tomatoes is about 40,000 to 70,000 (LUX). When the amount of solar radiation in the greenhouse 10 exceeds the light saturation point, the photosynthesis amount of the crops does not increase even if the amount of solar radiation in the greenhouse 10 is further increased. By adjusting the inclination angle so that the amount of solar radiation in the greenhouse 10 is below the light saturation point of the crops cultivated in the greenhouse 10, the amount of solar radiation irradiated on the solar panel 102 increases, and the power generation amount of the entire control system 100 increases. The light compensation point is the lower limit value of the amount of solar radiation at which the amount of carbon dioxide absorbed by the leaves through photosynthesis is equal to the amount of carbon dioxide released by the respiration of the plant.

[0061] In addition, in the present embodiment, in a state where the saturation difference is controlled to a target value, the temperature in the greenhouse 10 is adjusted to a target value according to the crops cultivated in the greenhouse 10. The cultivation temperature according to the variety of heat-loving vegetables, that is, the optimum germination temperature and the optimum growth temperature are shown in FIG. 7. Also, the cultivation temperature according to the variety of medium-temperature vegetables, that is, the optimum germination temperature and the optimum growth temperature are shown in FIG. 8. Also, the cultivation temperature according to the variety of cool-season vegetables, that is, the optimum germination temperature and the optimum growth temperature are shown in FIG. 9. As an example, the target value of the cultivation temperature according to the crops is the median value of the temperature ranges shown in FIGS. 7 to 9.

[0062] As shown in FIG. 10, the control device 200 includes a processor 210, a memory 212, and a communication interface 214. The processor 210 includes one or more CPUs (Central Processing Units) and their peripheral circuits. The processor 210 may further include other arithmetic circuits such as a logical arithmetic unit, a numerical arithmetic unit, or a graphic processing unit.

[0063] Note that, as described later, a data group when controlling the environmental conditions in the greenhouse 10 for model learning may be acquired in advance. For this reason, as shown in FIG. 10, a storage device 202 for storing these data groups may be connected to the control device 200.

[0064] The memory 212 includes, for example, a readable and writable semiconductor memory, that is, a RAM (Random Access Memory), a read-only semiconductor memory, that is, a ROM (Read only memory), and a non-volatile memory. Further, the memory 212 may be a storage medium such as a semiconductor memory card, a hard disk, or an optical storage medium. The optimal saturation difference corresponding to the type of crop is stored in the memory 212.

[0065] The communication interface 214 corresponds to the communication I / F shown in FIG. 10 and has an interface circuit for connecting the control device 200 to the power supply switch 112 and the battery power supply switch 120. Further, the communication interface 214 has an interface circuit for connecting the control device 200 to the sensor 50, the first motor 38, the second motor 39, the third motor 42, the fourth motor 44, the ventilation device 60, the mist spraying device 70, the pressure pump 80, the electrical equipment 90, and the storage device 202. Furthermore, the communication interface 214 has an interface circuit for connecting to an external communication network 220 such as the Internet.

[0066] The control device 200 is connected to an external server 230 via a communication network 220. The server 230 transmits various types of information such as weather information to the control device 200 via the communication network 220. Note that the weather information may include information on temperature, weather, humidity, atmospheric pressure, wind force, and wind direction.

[0067] As shown in FIG. 11, the processor 210 includes an information acquisition unit 210a, a saturation deficit acquisition unit 210b, a power generation amount acquisition unit 210c, a panel control unit 210d, a ventilation control unit 210g, a mist spraying control unit 210h, a panel angle control unit 210f, and a learning unit 210i. Each of these units included in the processor 210 is a functional module realized by, for example, a computer program operating on the processor 210. That is, each of these units included in the processor 210 is composed of the processor 210 and a program for operating it, that is, software. Further, the program may be recorded in the memory 212 provided in the control device 200 or a recording medium connected externally. Alternatively, each of these units included in the processor 210 may be a dedicated arithmetic circuit provided in the processor 210.

[0068] The information acquisition unit 210a acquires various types of information. The information acquisition unit 210a acquires the information detected by the sensor 50. Specifically, the information acquisition unit 210a acquires the temperature inside the greenhouse 10, the relative humidity inside the greenhouse 10, the solar radiation amount inside the greenhouse 10, and the outside air temperature. Further, the information acquisition unit 210a acquires the rotation angles of the first motor 38, the second motor 39, and the third motor 42, and the temperature of the solar panel 102. In addition, the information acquisition unit 210a acquires the light saturation point and the cultivation temperature corresponding to the crops cultivated inside the greenhouse 10. Note that these light saturation point and cultivation temperature are, for example, those shown in FIGS. 6 to 9 and may be stored in advance in the memory 212. Furthermore, the information acquisition unit 210a acquires various types of information such as weather information from an external server 230 via the communication network 220.

[0069] The saturation difference acquisition unit 210b acquires the saturation difference inside the greenhouse 10. The saturation difference acquisition unit 210b acquires the saturation difference inside the greenhouse 10 based on the temperature inside the greenhouse 10 and the relative humidity inside the greenhouse 10 acquired by the information acquisition unit 210a. Specifically, the saturation difference acquisition unit 210b substitutes the temperature inside the greenhouse 10 and the relative humidity inside the greenhouse 10 into formulas (1) to (3) to acquire the saturation difference inside the greenhouse 10. Also, the saturation difference acquisition unit 210b may apply the temperature inside the greenhouse 10 and the relative humidity inside the greenhouse 10 to the map shown in FIG. 5 to acquire the saturation difference inside the greenhouse 10.

[0070] The power generation amount acquisition unit 210c acquires the power generation amount of the solar panel 102 from a sensor that detects the power generation amount of the solar panel 102. Note that the power generation amount acquisition unit 210c may acquire the conversion efficiency from solar energy to electrical energy by the solar panel 102 instead of the power generation amount of the solar panel 102. In this case, the conversion efficiency is acquired by dividing the power generation amount of the solar panel 102 by the solar irradiance measured outside the greenhouse 10.

[0071] The panel control unit 210d controls the spatial arrangement of the solar panel 102 based on the saturation difference inside the greenhouse 10 acquired by the saturation difference acquisition unit 210b and the power generation amount of the solar panel 102 acquired by the power generation amount acquisition unit 210c. For this purpose, the panel control unit 210d includes a panel position control unit 210e and a panel angle control unit 210f. The panel position control unit 210e controls the position of the solar panel 102 based on the saturation difference inside the greenhouse 10 acquired by the saturation difference acquisition unit 210b, and changes the size of the light transmission region between adjacent solar panels 102. For example, the panel position control unit 210e changes the width W of the opening 24 based on the saturation difference inside the greenhouse 10 acquired by the saturation difference acquisition unit 210b. The panel position control unit 210e makes the size of the light transmission region, that is, the width W of the opening 24, larger as the saturation difference is smaller.

[0072] Specifically, the panel position control unit 210e controls the first motor 38 and the second motor 39 so that the saturation difference in the greenhouse 10 acquired by the saturation difference acquisition unit 210b becomes a target value corresponding to the crop cultivated in the greenhouse 10, and slides the solar panel 102 of the second solar power generation unit 22 in the direction of arrow A1 in FIGS. 3 and 4.

[0073] When the saturation difference is smaller than the target value, the panel position control unit 210e controls the position of the solar panel 102 of the second solar power generation unit 22 so as to raise the temperature in the greenhouse 10. For this purpose, the panel position control unit 210e controls the first motor 38 and the second motor 39 so that the width W of the opening 24 becomes larger as the saturation difference is smaller than the target value. By increasing the width W of the opening 24, the amount of solar radiation irradiated into the greenhouse 10 increases, and the temperature in the greenhouse 10 rises. Therefore, the saturation difference in the greenhouse 10 increases, and the panel position control unit 210e controls the difference between the saturation difference and the target value to be smaller.

[0074] Further, when the saturation difference is larger than the target value, the panel position control unit 210e controls the position of the solar panel 102 of the second solar power generation unit 22 so as to lower the temperature in the greenhouse 10. For this purpose, the panel position control unit 210e controls the first motor 38 and the second motor 39 so that the width W of the opening 24 becomes smaller as the saturation difference is larger than the target value. By decreasing the width W of the opening 24, the amount of solar radiation irradiated into the greenhouse 10 decreases, and the temperature in the greenhouse 10 drops. Therefore, the saturation difference in the greenhouse 10 decreases, and the panel position control unit 210e controls the difference between the saturation difference and the target value to be smaller.

[0075] Also, the panel position control unit 210e controls the position of the solar panel 102 in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value, and changes the size of the light transmission region, that is, the width W of the opening 24, to control the temperature in the greenhouse 10 to a target value determined according to the crop. The panel position control unit 210e controls the first motor 38 and the second motor 39 so that the temperature in the greenhouse 10 becomes the target value corresponding to the crop, and slides the solar panel 102 of the second solar power generation unit 22 in the direction of arrow A1 in FIGS. 3 and 4.

[0076] When the temperature is lower than the target value, the panel position control unit 210e controls the position of the solar panel 102 of the second solar power generation unit 22 so as to raise the temperature in the greenhouse 10 in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value. More specifically, the panel position control unit 210e controls the first motor 38 and the second motor 39 so that the width W of the opening 24 becomes larger as the temperature is lower than the target value. By increasing the width W of the opening 24, the amount of solar radiation irradiated into the greenhouse 10 increases, the temperature in the greenhouse 10 increases, and the temperature is controlled to the target value.

[0077] Also, when the temperature is higher than the target value, the panel position control unit 210e controls the position of the solar panel 102 of the second solar power generation unit 22 so as to lower the temperature in the greenhouse 10 in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value. More specifically, the panel position control unit 210e controls the first motor 38 and the second motor 39 so that the width W of the opening 24 becomes smaller as the temperature is higher than the target value. By decreasing the width W of the opening 24, the amount of solar radiation irradiated into the greenhouse 10 decreases, and the temperature in the greenhouse 10 decreases. Therefore, the temperature in the greenhouse 10 decreases, and the temperature is controlled to the target value.

[0078] The ventilation control unit 210g controls a ventilation device 60 that ventilates the air inside the greenhouse 10 and the air outside the greenhouse 10. The ventilation control unit 210g increases the ventilation amount by the ventilation device 60 as the saturation difference in the greenhouse 10 is smaller, and controls the saturation difference in the greenhouse 10 to a target value according to the crops cultivated in the greenhouse 10.

[0079] The ventilation control unit 210g increases the ventilation amount of the ventilation device 60 as the saturation difference is smaller than the target value. Thereby, the inside of the greenhouse 10 is dehumidified. Therefore, the saturation difference in the greenhouse 10 increases, and the saturation difference is controlled to the target value. For example, at night or in winter, the saturation difference tends to be small due to the low temperature, and the necessity of dehumidification increases. For this reason, control is performed to increase the ventilation amount to perform dehumidification and increase the saturation difference. Note that heating by a heating device may be used in combination for dehumidification.

[0080] Further, the ventilation control unit 210g reduces the ventilation volume of the ventilation device 60 more or sets the ventilation volume to 0 as the saturation deficit is larger than the target value. Thereby, dehumidification in the greenhouse 10 is suppressed. Thus, the saturation deficit in the greenhouse 10 decreases, and the saturation deficit is controlled to the target value.

[0081] Also, the ventilation control unit 210g controls the ventilation device 60 in a state where the deviation between the saturation deficit and its target value is equal to or less than a predetermined value, thereby controlling the temperature in the greenhouse 10 to the target value determined according to the crop.

[0082] When the temperature is lower than the target value, the ventilation control unit 210g controls the ventilation device 60 so as to raise the temperature in the greenhouse 10. More specifically, the ventilation control unit 210g reduces the ventilation volume of the ventilation device 60 more or sets the ventilation volume to 0 as the temperature is lower than the target value. Thereby, the temperature in the greenhouse 10 rises, and the temperature is controlled to the target value.

[0083] When the temperature is higher than the target value, the ventilation control unit 210g controls the ventilation device 60 so as to lower the temperature in the greenhouse 10. More specifically, the ventilation control unit 210g increases the ventilation volume of the ventilation device 60 more as the temperature is higher than the target value. Thereby, the temperature in the greenhouse 10 decreases, and the temperature is controlled to the target value.

[0084] The mist spraying control unit 210h controls a mist spraying device 70 that sprays mist inside the greenhouse 10. The mist spraying control unit 210h increases the mist spraying amount by the mist spraying device 70 as the saturation deficit in the greenhouse 10 is larger, and controls the saturation deficit in the greenhouse 10 to the target value according to the crop cultivated in the greenhouse 10. Specifically, the mist spraying control unit 210h increases the mist spraying amount more as the saturation deficit is larger than the target value. Thereby, the temperature in the greenhouse 10 decreases and the humidity increases, and the saturation deficit is controlled to the target value.

[0085] Further, the mist spraying control unit 210h controls the mist spraying device 70 in a state where the deviation between the saturation deficit and its target value is equal to or less than a predetermined value, thereby controlling the temperature in the greenhouse 10 to the target value determined according to the crop. More specifically, the mist spraying control unit 210h increases the mist spraying amount more as the temperature is higher than the target value. As a result, the temperature in the greenhouse 10 decreases and the temperature is controlled to the target value.

[0086] For example, when the solar radiation amount of sunlight is large, the humidity in the greenhouse 10 tends to decrease regardless of the season, so mist spraying is effective. Thereby, it is possible to supply water vapor into the greenhouse 10 and to cool the inside of the greenhouse 10.

[0087] Further, when the temperature of the solar panel 102 exceeds a predetermined value, the mist spraying control unit 210h sprays mist on the solar panel 102 by the mist spraying device 70 to cool the solar panel 102. Also in this case, the mist spraying control unit 210h controls the mist spraying amount so as to cool the solar panel 102 in a state where the deviation between the saturation deficit and its target value is equal to or less than a predetermined value. As a result, the power generation efficiency of the solar panel 102 increases and the power generation amount of the solar panel 102 increases.

[0088] Note that when the temperature is low and the humidity is high, the effect of mist spraying is relatively low. Therefore, under such conditions, the mist spraying control unit 210h may stop the mist spraying by the mist spraying device 70. Further, the mist spraying control unit 210h may stop the mist spraying by the mist spraying device 70 when the amount of rainwater stored in the water storage tank 82 is equal to or less than a predetermined value.

[0089] Note that when the mist spraying device 70 sprays warm water mist, the mist spraying control unit 210h may increase the mist spraying amount more as the temperature is lower than the target value in a state where the deviation between the saturation deficit and its target value is equal to or less than a predetermined value. As a result, the temperature in the greenhouse 10 rises and the temperature is controlled to the target value.

[0090] When controlling the vapor pressure deficit or temperature inside the greenhouse 10, the panel position control unit 210e, the ventilation control unit 210g, and the mist spraying control unit 210h may be configured to have a learned model.

[0091] For example, the panel position control unit 210e may be configured to have a learned model that has been machine-learned to calculate the width W of the opening 24. In this case, the learning unit 210i, for example, input values x 1 , x 2 , x 3 , x 4 , x 5 and input values x 1 , x 2 , x 3 , x 4 , x 5 and teacher data y t for a plurality of data sets consisting of create a learned model. For a certain input value, teacher data y t is required. When the output value from the output layer for this input value is y and the mean squared error is used as the error function, the mean squared error E is E = (1 / 2)·(y - y t ) 2 is obtained.

[0092] The learning unit 210i inputs the input values included in the data set into the neural network, and calculates the mean squared error E from the obtained output value y and the teacher data y t included in the data set. Then, the learning unit 210i performs operations such as the error backpropagation method and the stochastic gradient descent method to minimize the sum of the mean squared errors E obtained from a plurality of learning data sets, thereby calculating the weights w and biases b of each node, and creating a learned model. Note that when the teacher data cannot be detected, the learning unit 210i may create a learned model by unsupervised learning or reinforcement learning.

[0093] To create a learned model, a data group when various environmental conditions in the greenhouse 10 are controlled in advance is acquired. The environmental conditions include vapor pressure deficit, solar radiation amount, power generation amount, and temperature. These data groups include meteorological information, the temperature inside the greenhouse 10, the target value of the temperature inside the greenhouse 10, the relative humidity inside the greenhouse 10, the vapor pressure deficit inside the greenhouse 10, the target value of the vapor pressure deficit inside the greenhouse 10, the solar radiation amount inside the greenhouse 10, the width W of the opening 24, the tilt angle of the solar panel 102, the ventilation volume of the ventilation device 60, the mist spray amount of the mist spray device 70, the power generation amount of the solar panel 102, the temperature of the solar panel 102, time, and season information. The data set for learning is composed of these data groups. These data groups may be sequentially acquired in the process of performing the processing of FIG. 12 described later without using the learned model. The acquired data group is stored in the memory 212 of the control device 200 or the storage device 202 connected to the control device 200.

[0094] When the learning unit 210i creates a learned model for calculating the width W of the opening 24, the input values x 1 , x 2 , x 3 , x 4 , x 5 are, as an example, at least a part of the data excluding the width W of the opening 24 which is the teacher data from the above data group. Also, the teacher data y t is the width W of the opening 24. Thus, when the current value of the input value is input to the created learned model, the width W of the opening 24 is output from the learned model. The panel position control unit 210e controls the first motor 38 and the second motor 39 based on the rotation angles of the first motor 38 and the second motor 39 so that the width W of the opening 24 becomes the width W output from the learned model.

[0095] Similarly, the ventilation control unit 210g may be configured to have a learned model machine-learned for calculating the ventilation volume of the ventilation device 60. When the learning unit 210i creates a learned model for calculating the ventilation volume of the ventilation device 60, the input values x 1 , x 2 , x 3 , x 4 , x 5is, as an example, at least a part of the data obtained by removing the ventilation volume of the ventilation device 60, which is the teacher data, from the above data group. Also, the teacher data y t is the ventilation volume of the ventilation device 60. Thus, when the current value of the input value is input to the created learned model, the ventilation volume of the ventilation device 60 is output from the learned model. The ventilation control unit 210g controls the ventilation device 60 so that the ventilation volume of the ventilation device 60 becomes the ventilation volume output from the learned model.

[0096] Similarly, the mist spraying control unit 210h may be configured to have a learned model that has been machine-learned to calculate the mist spraying amount of the mist spraying device 70. When the learning unit 210i creates a learned model for calculating the mist spraying amount, the input values x 1 , x 2 , x 3 , x 4 , x 5 are, as an example, at least a part of the data obtained by removing the mist spraying amount, which is the teacher data, from the above data group. Also, the teacher data y t is the mist spraying amount. Thus, when the current value of the input value is input to the created learned model, the mist spraying amount is output from the learned model. The mist spraying control unit 210h controls the mist spraying device 70 so that the mist spraying amount of the mist spraying device 70 becomes the mist spraying amount output from the learned model.

[0097] The panel angle control unit 210f changes the tilt angle of the solar panel 102 based on the power generation amount acquired by the power generation amount acquisition unit 210c. The panel angle control unit 210f controls the third motor 42 and the fourth motor 44 so that the power generation amount of the solar panel 102 becomes larger in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value, and controls the tilt angle of the solar panel 102 of the second solar power generation unit 22. The power generation amount of the solar panel 102 changes according to the angle between the light receiving surface of the solar panel 102 and the direction of solar radiation. And the direction of solar radiation varies according to the time, season, and the latitude and longitude of the site where the greenhouse 10 is installed. For this reason, the panel angle control unit 210f calculates the direction of solar radiation corresponding to the time, season, and the latitude and longitude of the site where the greenhouse 10 is installed. And the panel angle control unit 210f controls the third motor 42 and the fourth motor 44 so that the angle between the direction of solar radiation and the normal line of the light receiving surface of the solar panel 102 becomes smaller in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value. That is, the panel angle control unit 210f makes the light receiving surface of the solar panel 102 face more directly in the direction of solar radiation in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value.

[0098] Also, the panel angle control unit 210f controls the tilt angle of the solar panel 102 so that it becomes larger within a range where the solar radiation amount in the greenhouse 10 does not exceed the light saturation point of the crops cultivated in the greenhouse 10 in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value. Specifically, the panel angle control unit 210f controls the third motor 42 and the fourth motor 44 so that the angle between the direction of solar radiation and the normal line of the light receiving surface of the solar panel 102 becomes smaller within a range where the solar radiation amount does not exceed the light saturation point, and changes the tilt angle of the solar panel 102 of the second solar power generation unit 22.

[0099] Also, when the power generation amount acquisition unit 210c acquires the conversion efficiency from solar energy to electrical energy by the solar panel 102 instead of the power generation amount by the solar panel 102, the panel angle control unit 210f may control the tilt angle of the solar panel 102 so that the conversion efficiency is maximized.

[0100] In addition, as a result of changing the tilt angle of the solar panel 102, if the saturation difference goes out of the range of the target value, the position of the solar panel 102 is controlled by the panel position control unit 210e, the ventilation amount is controlled by the ventilation control unit 210g, and the mist spray amount is controlled by the mist spray control unit 210h, so that the saturation difference is controlled within the range of the target value.

[0101] When controlling the tilt angle of the solar panel 102, the panel angle control unit 210f may be configured to have a learned model. When the learning unit 210i creates a learned model for calculating the tilt angle of the solar panel 102, the input values x 1 , x 2 , x 3 , x 4 , x 5 are, for example, at least some of the data excluding the tilt angle of the solar panel 102, which is the teacher data, from the above data group. Also, the teacher data y t is the tilt angle of the solar panel 102. Thus, when the current value of the input value is input to the created learned model, the tilt angle of the solar panel 102 is output from the learned model. The mist spray control unit 210h controls the tilt angle of the solar panel 102 so as to be the tilt angle output from the learned model.

[0102] Next, the time-series flow for each control period Δt of the processing of the processor 210 will be described based on the flowchart of FIG. 12. First, in step S10 of FIG. 12, the time is set to t. Next, the information acquisition unit 210a acquires various information (step S12). Next, the saturation difference acquisition unit 210b acquires the saturation difference in the greenhouse 10 (step S13). Next, it is determined whether or not the absolute value of the difference between the saturation difference and its target value is less than or equal to a predetermined value TH1 (step 14). If the absolute value of the difference between the saturation difference and its target value is not less than or equal to the predetermined value TH1 in step S14, as described above, control is performed by the panel position control unit 210e, the ventilation control unit 210g, and the mist spray control unit 210h to make the saturation difference the target value (step 16).

[0103] In step S14, when the absolute value of the difference between the saturation difference and its target value is less than or equal to a predetermined value TH1, it is determined whether the difference obtained by subtracting the solar radiation amount in the greenhouse 10 from the light saturation point of the crop is 0 or more and less than or equal to a predetermined value TH2 (step 17). If the difference obtained by subtracting the solar radiation amount from the light saturation point in step 17 is not 0 or more and less than or equal to the predetermined value TH2, as described above, the panel angle control unit 210f controls the third motor 42 and the fourth motor 44 to change the tilt angle of the solar panel 102 of the second solar power generation unit 22 (step S20). After step S20, the process proceeds to step S25.

[0104] In step S17, when the difference obtained by subtracting the solar radiation amount from the light saturation point is 0 or more and less than or equal to a predetermined value TH2, it is determined whether the power generation amount of the solar panel 102 is the maximum (step S18). If the power generation amount of the solar panel 102 is not the maximum in step S18, as described above, the panel angle control unit 210f controls the third motor 42 and the fourth motor 44 to change the tilt angle of the solar panel 102 of the second solar power generation unit 22 (step S20). After step S20, the process proceeds to step S25.

[0105] In step S18, when the power generation amount of the solar panel 102 is the maximum, it is determined whether the absolute value of the difference between the temperature in the greenhouse 10 and its target value is less than or equal to a predetermined value TH3 (step 22). If the absolute value of the difference between the temperature and its target value is not less than or equal to the predetermined value TH3, as described above, the temperature is controlled to the target value by the panel position control unit 210e, the ventilation control unit 210g, and the mist spray control unit 210h (step 24). After step S24, the process proceeds to step S25. On the other hand, in step 22, when the absolute value of the difference between the temperature and its target value is less than or equal to the predetermined value TH3, the process proceeds to step S25 without going through step 24.

[0106] In step S25, it is determined again whether or not the absolute value of the difference between the saturation difference and its target value is less than or equal to a predetermined value TH1. If the absolute value of the difference between the saturation difference and its target value is not less than or equal to the predetermined value TH1 in step S25, the saturation difference and the target value are in a state of deviating beyond the predetermined value TH by the processing of step S20 or step S24. Therefore, the processing after step S17 is performed again. In this case, when the processing of step S20 or step S24 is performed again within the same control cycle, the control amount of the angle or the temperature is decreased compared to the previous processing within the same control cycle.

[0107] If the absolute value of the difference between the saturation difference and its target value is less than or equal to the predetermined value TH1 in step S25, the time is set to t = t + Δt (step S26), the process returns to step S12, and in the next control cycle, the processes after step S12 are repeatedly performed.

[0108] As described above, according to the present embodiment, the saturation difference in the greenhouse 10 is controlled according to the crops cultivated in the greenhouse 10. Therefore, the stomata of the crops open appropriately, both photosynthesis and transpiration are promoted, and the crops cultivated in the greenhouse 10 can grow in an optimal environment. In addition, since the inclination angle of the solar panel is controlled so that the power generation amount becomes maximum, the crops can grow in an optimal environment and the power generation efficiency can be improved.

Description of Signs

[0109] 10 Greenhouse 12 Side wall 14 Roof 20 First solar power generation unit 22 Second solar power generation unit 24 Opening 34 Wire 36 First pulley 37 Second pulley 38 First motor 39 Second motor 42 Third motor 44 Fourth motor 40 Shaft 50 Sensor 60 Ventilation device 70 Mist spraying device 80 Pressure pump 82 Water storage tank 90 Electrical equipment 100 Control system 102 Solar panel 104 Junction box 106 DC / AC high-frequency inverter 108 High-frequency transformer 110 Earth leakage breaker 112 Power supply switch 118 AC / DC converter 120 Battery power supply switch 122 DC / DC converter 124 Battery 200 Control device 210 Processor 210a Information acquisition unit 210b Saturation difference acquisition unit 210c Power generation amount acquisition unit 210d Panel control unit 210e Panel position control unit 210f Panel angle control unit 210g Ventilation control unit 210h Mist spraying control unit 210i Learning unit 212 Memory 214 Communication interface 220 Communication network 230 Server 300 Power generation operator 350 Consumer 400 Electric power company

Claims

1. A control system for controlling solar power generation by a plurality of solar panels arranged above a closed space in which crops are cultivated, comprising: a saturation difference acquisition unit that acquires the saturation difference within the closed space; a power generation amount acquisition unit that acquires the power generation amount of the solar panels; a panel control unit that controls the spatial arrangement of the solar panels based on the saturation difference and the power generation amount; A control system comprising:

2. The panel control unit A panel position control unit that controls the position of the solar panels based on the saturation difference and changes the size of the light transmission region between adjacent solar panels; A panel angle control unit that controls the tilt angle of the solar panels based on the power generation amount, the control system according to claim 1.

3. The panel position control unit makes the size of the light transmission region larger as the saturation difference is smaller, the control system according to claim 2.

4. The panel position control unit controls the position of the solar panels so that the difference between the saturation difference and the target value of the saturation difference corresponding to the crops cultivated in the closed space becomes smaller, the control system according to claim 2.

5. Comprising a ventilation control unit that controls a ventilation device that ventilates the air inside the closed space and the air outside the closed space, The ventilation control unit makes the ventilation amount by the ventilation device larger as the saturation difference is smaller, the control system according to claim 1.

6. Comprising a mist spraying control unit that controls a mist spraying device that sprays mist inside the closed space, The mist spraying control unit increases the mist spraying amount by the mist spraying device as the saturation difference is larger, the control system according to claim 1.

7. The panel angle control unit controls the tilt angle so that the power generation amount of the solar panels becomes larger in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value, the control system according to claim 4.

8. The panel angle control unit controls the tilt angle so that the power generation amount of the solar panels becomes larger in a range where the solar radiation amount inside the closed space does not exceed the light saturation point of the crops cultivated in the closed space in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value, the control system according to claim 4.

9. The panel position control unit controls the position of the solar panel to change the size of the light-transmitting area in a state where the deviation between the saturation difference and the target value is equal to or less than a predetermined value, thereby controlling the temperature in the closed space to a target value determined according to the crop. The control system according to claim 4.

10. The ventilation control unit controls the ventilation device in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value, thereby controlling the temperature in the closed space to a target value determined according to the crop. The control system according to claim 5.

11. The mist spraying control unit controls the mist spraying device in a state where the deviation between the saturation difference and its target value is equal to or less than a predetermined value, thereby controlling the temperature in the closed space to a target value. The control system according to claim 6.

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