Control system

Abstract

To predict the power demand of a first group of equipment that operates with DC power and a second group of equipment that operates with AC power in advance, and optimally allocate power between the first and second groups of equipment.SOLUTION: In a control system, a processor 210 includes a first power demand prediction unit 210b, a second power demand prediction unit 210c, a power generation amount prediction unit 210d, and a power supply control unit 210e. The first power demand prediction unit 210b predicts a first power demand amount which is a power demand amount of a first group of equipment operating with DC power. The second power demand prediction unit 210c predicts a second power demand amount which is a power demand amount of a second group of equipment operating with AC power. The power generation amount prediction unit 210d predicts a power generation amount of a solar panel 102 that supplies power to the first group of equipment and the second group of equipment. The power supply control unit 210e controls power supply to the first group of equipment and the second group of equipment on the basis of the first power demand amount, the second power demand amount, and the power generation amount of the solar panel 102.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] Conventionally, a technology has been known that assumes that DC power is supplied preferentially to DC loads depending on the actual amount of power generated by solar panels and fuel cells, then AC power is supplied preferentially to AC loads by a power conditioner, and finally AC power is supplied to an AC power grid (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-41886 A Summary of the Invention [Problem to be solved by the invention]

[0004] The amount of electricity generated by solar power fluctuates depending on the weather, sunlight, etc. Furthermore, when electricity generated by solar power is allocated to both equipment that runs on DC power and equipment that runs on AC power, the electricity demand in both equipment also fluctuates from moment to moment.

[0005] However, the technology described in Patent Document 1 supplies power to DC loads and then AC loads according to the actual power generation amount, and finally compensates for the shortfall in the power supply amount of the AC loads with the AC power system, but does not take into consideration the fluctuation in the future power demand of the DC loads and AC loads. For this reason, it is difficult to optimally supply power to each of the DC loads and AC loads according to the fluctuation in the future power demand.

[0006] In view of the above problems, an object of the present disclosure is to provide a control system capable of predicting in advance the power demand of a first group of equipment that operates on DC power and a second group of equipment that operates on AC power, and optimally allocating power to the first group of equipment and the second group of equipment. [Means for solving the problem]

[0007] The gist of the present disclosure is as follows.

[0008] (1) The control system includes a first power demand prediction unit, a second power demand prediction unit, a power generation amount prediction unit, and a power supply control unit. The first power demand prediction unit predicts a first power demand. The first power demand is the power demand of a first equipment group. The first equipment group operates on DC power. The second power demand prediction unit predicts a second power demand. The second power demand is the power demand of a second equipment group. The second equipment group operates on AC power. The power generation amount prediction unit predicts the power generation amount of a solar panel that supplies power to the first equipment group and the second equipment group. The power supply control unit controls power supply to the first equipment group and the second equipment group based on the first power demand, the second power demand, and the power generation amount of the solar panel.

[0009] (2) The control system described in (1) above supplies the power generated by the solar panels to the first equipment group with priority over the second equipment group. The control system supplies surplus power generated by the solar panels to the second equipment group.

[0010] (3) In the control system described in (1) or (2) above, when the amount of power generation is equal to or less than the first power demand, the power supply control unit supplies the power generated by the solar panel only to the first group of equipment.

[0011] (4) In the control system according to any one of (1) to (3), when the amount of power generated is greater than the first power demand and is equal to or less than the sum of the first power demand and the second power demand, the power supply control unit supplies the power generated by the solar panel to the first equipment group with priority. In this case, the power supply control unit supplies the surplus power generated by the solar panel to the second equipment group.

[0012] (5) In the control system according to any one of (1) to (4) above, when the amount of power generation is greater than the sum of the first power demand and the second power demand, the power supply control unit supplies the power generated by the solar panel to the first equipment group and the second equipment group. In this case, the power supply control unit supplies surplus power generated by the solar panel to a storage battery for storage.

[0013] (6) In the control system described in (4) above, when the amount of power generation is greater than the first power demand and is equal to or less than the sum of the first power demand and the second power demand, the power supply control unit supplies the power stored in the storage battery to the second group of equipment.

[0014] (7) The control system described in any one of (1) to (6) above further includes the solar panel, the first equipment group, and the second equipment group. The solar panel receives sunlight and generates power. The first equipment group is supplied with the power generated by the solar panel. The second equipment group is supplied with the power generated by the solar panel.

[0015] (8) The control system according to (5) or (6) above includes the storage battery. The storage battery stores the electric power generated by the solar panel.

[0016] (9) A control device for a solar power generation system includes a first power demand prediction unit, a second power demand prediction unit, a power generation prediction unit, and a power supply control unit. The first power demand prediction unit predicts a first power demand. The first power demand is the power demand of a first equipment group. The first equipment group operates on DC power. The second power demand prediction unit predicts a second power demand. The second power demand is the power demand of a second equipment group. The second equipment group operates on AC power. The power generation prediction unit predicts the power generation of a solar panel that supplies power to the first equipment group and the second equipment group. The power supply control unit controls power supply to the first equipment group and the second equipment group based on the first power demand, the second power demand, and the power generation of the solar panel.

[0017] (10) A method for controlling a solar power generation system includes a first step, a second step, a third step, and a fourth step. The first step predicts a first power demand. The first power demand is the power demand of a first equipment group. The first equipment group operates on DC power. The second step predicts a second power demand. The second power demand is the power demand of a second equipment group. The second equipment group operates on AC power. The third step predicts a power generation amount of a solar panel that supplies power to the first equipment group and the second equipment group. The fourth step controls power supply to the first equipment group and the second equipment group based on the first power demand, the second power demand, and the power generation amount of the solar panel.

[0018] (11) The program causes a computer to function as first means, second means, third means, and fourth means. The first means predicts a first power demand. The first power demand is the power demand of a first equipment group. The first equipment group operates on DC power. The second means predicts a second power demand. The second power demand is the power demand of a second equipment group. The second equipment group operates on AC power. The third means predicts a power generation amount of a solar panel that supplies power to the first equipment group and the second equipment group. The fourth means controls power supply to the first equipment group and the second equipment group based on the first power demand, the second power demand, and the power generation amount of the solar panel. Effect of the Invention

[0019] According to the present disclosure, a control system is provided that is capable of predicting in advance the power demand of a first group of equipment that operates on DC power and a second group of equipment that operates on AC power, and optimally allocating power to the first group of equipment and the second group of equipment. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration of a fully self-consumption on-site PPA. [Diagram 2] 1 is a schematic diagram showing the exterior of a factory equipped with a solar power generation system according to an embodiment of the present disclosure. [Diagram 3] 1 is a schematic diagram showing a configuration of a solar power generation system according to a first embodiment. [Figure 4] FIG. 2 is a schematic diagram showing the configuration of a control device and its surroundings. [Diagram 5] FIG. 2 is a functional block diagram of a processor. [Figure 6] 1 is a characteristic diagram showing a temporal change in the amount of electricity used (actual value) on the same day of the previous year when the amount of electricity demand is predicted. [Figure 7] FIG. 7 is a diagram showing the detailed power usage in the time period from 6:00 to 18:00 with respect to the actual values ​​of the power usage in FIG. 6. [Figure 8]FIG. 8 is a diagram showing a case where, in contrast to FIG. 7, the equipment belonging to the DC power supply group and the equipment belonging to the AC power supply group have changed from the previous year on the day for predicting the power demand. [Figure 9] 4 is a flowchart showing a process performed by a processor of the control device. [Figure 10] FIG. 11 is a schematic diagram showing the configuration of a solar power generation system according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] 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.

[0022] (First embodiment) As an example, the photovoltaic power generation control system 100 according to the present embodiment is used in the form of a completely self-consumption on-site PPA. In the on-site PPA, as shown in FIG. 1, 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 (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.

[0023] In the case of a completely self-consumption type, all of 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 facilities within the premises of the consumer 350, and the power is not supplied to the power transmission network, power distribution network, etc. of other power systems.

[0024] In the completely self-consumption type, when the amount of power generated by the control system 100 is surplus to the amount of power required by the consumer 350, the surplus is stored in a storage battery. When the amount of power generated by the control system 100 is insufficient for the amount of power required by the consumer 350, the shortfall is made up for by the power stored in the storage battery. In addition, the shortfall may be made up by the consumer 350 purchasing power from an existing power company 400.

[0025] In this embodiment, a case where the consumer 350 is a factory owner is illustrated. The power generation business operator 300 installs the control system 100 shown in FIG. 1 in a factory 500 shown in FIG. 2. The consumer 350 may be someone other than the factory owner, and the control system 100 may be installed in a facility, building, or the like other than the factory 500. The control system 100 includes a solar panel 102, and the solar panel 102 is installed on the roof of the factory 500, for example. The control system 100 supplies electricity generated by solar power generation to various facilities provided in the factory 500.

[0026] The factory 500 is equipped with equipment belonging to a DC power supply group 510 and equipment belonging to an AC power supply group 520. The equipment belonging to the DC power supply group 510 operates on DC power. The equipment belonging to the DC power supply group 510 is supplied with DC power generated by the solar panel 102.

[0027] On the other hand, the equipment belonging to the AC power supply group 520 operates on AC power. The equipment belonging to the AC power supply group 520 receives DC power that is converted into AC power generated by the solar panel 102 and is supplied with the power.

[0028] As shown in Fig. 3, the control system 100 includes a solar panel 102, a connection box 104, a DC / AC high-frequency inverter 106, a high-frequency transformer 108, an AC / DC converter 110, an earth leakage breaker 112, a DC device switch 114, an AC power supply switch 116, a storage battery power supply switch 118, a DC / AC converter 120, a blending unit 121, an earth leakage breaker 122, an AC device switch 124, a DC / DC converter 126, a storage battery 128, and a control device 200. The control system 100 also includes equipment belonging to a DC power supply group 510 and equipment belonging to an AC power supply group 520. In Fig. 3, the dashed arrows extending from the control device 200 to the DC device switch 114, the AC power supply switch 116, the AC device switch 124, and the storage battery power supply switch 118 indicate signal lines through which control signals for driving these switches are transmitted. The dashed arrow extending from the control device 200 to the blending unit 121 indicates a signal line through which a control signal for controlling the blending unit 121 is transmitted.

[0029] The solar panel 102 receives sunlight and generates electricity. The solar panel 102 is made up of multiple solar cell modules, and each solar cell module is made up of multiple solar cell cells. The solar cell receives sunlight and converts the solar energy into electricity. The junction box 104, for example, combines output cables that extract DC output generated by each solar cell module into a single cable.

[0030] The DC / AC high frequency inverter 106 converts the power generated by the solar panel 102 from direct current to alternating current. The high frequency transformer 108 transforms the alternating current converted by the DC / AC high frequency inverter 106 to a desired voltage. The blending unit 121 connects the output line from the high frequency transformer 108 in parallel with the alternating current power system AC of the power company 400, and changes the blending ratio of the output of the high frequency transformer 108 and the output of the alternating current power system AC under the control of the control device 200. For this reason, the blending unit 121 is equipped with a sensor that detects the output of the high frequency transformer 108 and a sensor that detects the output of the alternating current power system AC. Since the system is a completely self-consumption type, the power generated by the solar panel 102 is not supplied to the power company 400. For this reason, a reverse power relay (RPR) prevents reverse power flow to the alternating current power system AC. The AC / DC converter 110 converts the alternating current transformed by the high frequency transformer 108 to direct current. The earth leakage breaker 112 cuts off the current when the direct current becomes excessive. The DC device switches 114 are composed of electromagnetic switches, and are switches that turn on / off the flow of DC to each piece of equipment in the DC power feeding group 510. Normally, all of the DC device switches 114 are set to on.

[0031] The AC power supply switch 116 is configured by an electromagnetic switch, and is a switch for supplying surplus power to the AC power supply group 520 as necessary when power generated by the solar panel 102 is supplied to the DC power supply group 510. As will be described in detail later, the AC power supply switch 116 is controlled to be turned on / off by the control device 200.

[0032] When the AC power supply switch 116 is on, the DC / AC converter 120 converts surplus power output from the AC / DC converter 110 and remaining after being supplied to the DC power supply group 510 into AC power. The earth leakage breaker 122 cuts off the AC current when the current becomes excessive. The AC device switch 124 is an electromagnetic switch that turns on / off the flow of AC to each piece of equipment in the AC power supply group 520. Under normal circumstances, all of the AC device switches 124 are set to on.

[0033] The storage battery power supply switch 118 is configured by an electromagnetic switch, and is a switch for supplying surplus power to the storage battery 128 as necessary when power generated by the solar panel 102 is supplied to the DC power supply group 510 and the AC power supply group 520. As will be described in detail later, the AC power supply switch 116 is controlled to be turned on / off by the control device 200. The DC / DC converter 126 converts the voltage of the DC converted by the AC / DC converter 110 to store it in the storage battery 128. The storage battery 128 stores the surplus power generated by the solar panel 102. The control system 100 according to this embodiment is a completely self-consumption type, and stores all surplus power generated by the solar panel 102 in the storage battery 128 and does not sell the power to the power company 400.

[0034] As described above, when power is supplied to the AC power supply group 520, the number of conversion stages is increased by converting DC to AC compared to when power is supplied to the DC power supply group 510, resulting in a larger conversion loss. For this reason, the control device 200 allocates power generated by solar power generation to the DC power supply group 510 with priority based on the prediction of the power demand of each of the DC power supply group 510 and the AC power supply group 520, and converts the resulting surplus power to AC and allocates it to the AC power supply group 520. This makes it possible to suppress the conversion loss.

[0035] 4, the control device 200 includes a processor 210, a memory 212, and a communication interface 214. The processor 210 includes one or more central processing units (CPUs) and their peripheral circuits. The processor 210 may further include other arithmetic circuits such as a logic arithmetic unit, a numerical arithmetic unit, or a graphic processing unit.

[0036] The memory 212 includes, for example, a readable and writable semiconductor memory, i.e., a random access memory (RAM), a read-only semiconductor memory, i.e., a read only memory (ROM), a non-volatile memory, etc. Furthermore, the memory 212 may be a storage medium such as a semiconductor memory card, a hard disk, or an optical storage medium.

[0037] The communication interface 214 includes interface circuitry for connecting the control device 200 to the AC powered switch 116, the battery powered switch 118, or an external communication network 220 such as the Internet.

[0038] 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.

[0039] As shown in Fig. 5, the processor 210 includes an information acquisition unit 210a, a first power demand prediction unit 210b, a second power demand prediction unit 210c, a power generation prediction unit 210d, a power supply control unit 210e, and a learning unit 210f. Each of these units included in the processor 210 is a functional module realized by a computer program that runs on the processor 210, for example. That is, each of these units included in the processor 210 is configured by the processor 210 and a program for making the processor 210 function, that is, software. The program may be recorded in the memory 212 included in the control device 200 or a recording medium connected from the outside. Alternatively, each of these units included in the processor 210 may be a dedicated arithmetic circuit provided in the processor 210.

[0040] The information acquiring unit 210a acquires various pieces of information transmitted from the server 230 via the communication network 220. The information acquiring unit 210a also acquires various pieces of information related to the control system 100, such as the state of charge of the storage battery 128, that is, SOC (State of Charge).

[0041] The first power demand prediction unit 210b predicts the power demand of a first equipment group operating on DC power. That is, the first power demand prediction unit 210b predicts a first power demand indicating the power demand of equipment belonging to the DC power supply group 510. The second power demand prediction unit 210c predicts the power demand of a second equipment group operating on AC power. That is, the second power demand prediction unit 210c predicts a second power demand indicating the power demand of equipment belonging to the AC power supply group 520.

[0042] For example, the first power demand forecasting unit 210b and the second power demand forecasting unit 210c forecast the power demand based on the actual value of the power usage of the factory 500 on the same day of the previous year when the power demand is forecasted. The vertical axis of FIG. 6 indicates the power usage (kWh) on the same day of the previous year when the power demand is forecasted, and the horizontal axis indicates the time on the same day of the previous year. In addition, the characteristic C1 shown by the solid line in FIG. 6 indicates the total power usage of the equipment belonging to the DC power supply group 510, and the characteristic C2 shown by the dashed line indicates the total power usage of the equipment belonging to the AC power supply group 520. As shown in FIG. 6, during the daytime hours (6:00 to 18:00) when the factory 500 is operating, the power usage of the equipment belonging to the DC power supply group 510 and the power usage of the equipment belonging to the AC power supply group 520 are higher than during the hours when the factory 500 is not operating.

[0043] 7 shows the actual values ​​of the amount of power usage in FIG. 6, in detail every 30 minutes, showing the operation status of each of the equipment belonging to the DC power supply group 510 and the equipment belonging to the AC power supply group 520, and the total amount of power usage of each of the DC and AC. As shown in FIG. 7, the operation status can be "in use" or "stopped". The equipment belonging to the DC power supply group 510 is communication equipment A, air conditioning equipment B, temperature control equipment C, and others. The equipment belonging to the AC power supply group 520 is power equipment D, control equipment E, analytical equipment F, and others. The memory 212 of the control device 200 stores the amount of power usage on any past day as shown in FIG. 6 and FIG. 7.

[0044] The first power demand forecasting unit 210b forecasts the first power demand based on the actual value of the power usage of the facilities belonging to the DC power supply group 510 on the same day of the previous year. When the facilities belonging to the DC power supply group 510 are the same as those of the previous year, the first power demand forecasting unit 210b can set the actual value of the power usage on the same day of the previous year as the first power demand. In this case, for example, the forecast value of the first power demand for the time period from 11:00 to 11:30 on the day for forecasting the power demand is 815.00 (kWh) from FIG. 7.

[0045] Similarly, the second power demand forecasting unit 210c forecasts the second power demand based on the actual value of the power usage of the equipment belonging to the AC power supply group 520 on the same day of the previous year. When the equipment belonging to the AC power supply group 520 is the same as that of the previous year, the second power demand forecasting unit 210c can set the actual value of the power usage on the same day of the previous year as the second power demand. In this case, for example, the forecast value of the second power demand for the time period from 17:00 to 17:30 on the day on which the power demand is forecasted is 685.00 (kWh) from FIG. 7. Note that the first power demand forecasting unit 210b and the second power demand forecasting unit 210c may forecast using the actual value of the power usage on the same day of the week as the day on which the power demand is forecasted and the day closest to the same day of the previous year, instead of the actual value of the power usage on the same day of the previous year.

[0046] If the equipment belonging to the DC power supply group 510 and the equipment belonging to the AC power supply group 520 have changed from the previous year, the first power demand prediction unit 210b and the second power demand prediction unit 210c predict the first power demand and the second power demand based on the actual value of the amount of power used by the factory 500 on the same day of the previous year to the day on which the power demand is predicted, and the change in the equipment.

[0047] In FIG. 8, on the day for predicting the power demand, an air conditioner ΔB is added to the equipment belonging to the DC power supply group 510 on the same day of the previous year shown in FIG. 7. Therefore, the total power consumption of the DC power supply group 510 is expected to increase by the amount of the air conditioner ΔB. Also, in FIG. 8, on the day for predicting the power demand, an analytical instrument ΔF is added to the equipment belonging to the AC power supply group 520 on the same day of the previous year shown in FIG. 7. Therefore, the total power consumption of the AC power supply group 520 is expected to increase by the amount of the analytical instrument ΔF. The air conditioner ΔB is scheduled to be "in use" in the time slot of 11:00 to 15:00. Therefore, when predicting the power demand for the time slot of 11:00 to 15:00, the first power demand prediction unit 210b predicts the first power demand by adding the predicted value of the power consumption of the added air conditioner ΔB to the actual value of the power consumption on the same day of the previous year shown in FIG. 7. 8, the rated power consumption of air conditioner ΔB is 0.8 (kW), and the contribution rate is 55%. The first power demand prediction unit 210b calculates a prediction value of the power consumption of air conditioner ΔB by multiplying the rated power consumption by the usage time in one day and the contribution rate.

[0048] Similarly, analytical instrument ΔF is scheduled to be "in use" from 8:00 to 12:00. Therefore, when predicting the power demand from 8:00 to 12:00, the second power demand prediction unit 210c predicts the second power demand by adding the predicted value of the power usage of the added analytical instrument ΔF to the actual value of the power usage on the same day of the previous year shown in FIG. 7. As shown in FIG. 8, the rated power consumption of analytical instrument ΔF is 0.3 (kW), and the contribution rate is 65%. The second power demand prediction unit 210c calculates the predicted value of the power usage of analytical instrument ΔF by multiplying the rated power consumption by the usage time in one day and the contribution rate.

[0049] 8 shows an example in which equipment of facilities belonging to DC power supply group 510 on the same day of the previous year is added. On the other hand, when some equipment is abolished or removed, the first power demand forecasting unit 210b and the second power demand forecasting unit 210c predict the first power demand and the second power demand from the actual values ​​of the power usage on the same day of the previous year, excluding the actual values ​​of the power usage of the abolished or removed equipment.

[0050] In FIG. 8, for example, when air conditioner B and air conditioner ΔB are set to a constant temperature and operated continuously, they perform on / off control and output adjustments according to the functions of the equipment. Temperature regulator C also performs on / off control similar to that of the air conditioner. In addition, room temperature changes occur due to the introduction of outside air into the room. Analytical equipment F and ΔF may also have different operating units when observing samples and when analyzing them. In this way, there may be factors in the power consumption of equipment that are relatively difficult to predict.

[0051] Therefore, when a discrepancy occurs between the actual value and the predicted value of the amount of power usage, the contribution rate of each device for which a discrepancy occurs is adjusted so as to satisfy the following formula. The adjusted contribution rate is sequentially stored in memory 212. As an example, when the absolute value of the difference between the actual value and the predicted value exceeds a predetermined threshold, for example, 5% of the actual value, the contribution rate of each device is adjusted. Actual power consumption per day = Rated power consumption of the device (kW) x usage time per day (h) x contribution rate (%) This allows the first power demand and the second power demand to be predicted with greater accuracy in the subsequent prediction of power usage.

[0052] The first power demand prediction unit 210b may be configured with a trained model that has been machine-learned to predict the first power demand. Similarly, the second power demand prediction unit 210c may be configured with a trained model that has been machine-learned to predict the second power demand. In this case, the learning unit 210f may, for example, input values ​​x1, x2, x3, x4, and x5, and training data y t A trained model is created from multiple datasets consisting of the training data y t is being calculated, and the output value from the output layer for this input value is y. If the squared error is used as the error function, the squared error E is E=(1 / 2)·(yy t ) 2 It can be calculated as follows.

[0053] The learning unit 210f inputs the input values ​​included in the data set to the neural network, and calculates the output value y obtained and the training data y included in the data set. t Then, in order to minimize the sum of the squared errors E obtained from a plurality of learning data sets, the learning unit 210f performs, for example, backpropagation, stochastic gradient descent, or other calculations to calculate the weights w and biases b of each node, thereby creating a trained model. Note that, if teacher data cannot be detected, the learning unit 210f may create a trained model by unsupervised learning or reinforcement learning.

[0054] When the learning unit 210f creates a trained model equivalent to the first power demand prediction unit 210b, the input values ​​x1, x2, x3, x4, and x5 are, for example, parameters of the shipment amount of various products manufactured in the factory 500, a production plan, the operation status and operation time of various pieces of equipment belonging to the DC power supply group 510, room temperature, outside temperature, and set temperature of air conditioners or temperature regulators. Here, the production plan may include a scheduled shipment amount and a process plan. The air conditioners or temperature regulators are equipment belonging to the DC power supply group 510 as described above. In addition, the teacher data y t are actual values ​​of the amount of power used by various equipment belonging to the DC power supply group 510. As a result, when data on the planned shipment amount of various products, the operation schedule of various equipment, time, and temperature are input to the created trained model, a predicted value of the first power demand is output from the trained model. When the learning unit 210f creates a trained model equivalent to the second power demand forecasting unit 210c, the input values ​​x1, x2, x3, x4, and x5 may include, for example, the same shipment amount, production plan, operation status, operation time, room temperature, and outside temperature as above, as well as the accumulated usage time indicating the deterioration degree of the power equipment, the required accuracy of the control equipment, and the sample temperature at the time of analysis required for the analysis equipment. Here, the operation status and operation time are the operation status and operation time of various equipment belonging to the high current power supply group 520, and the power equipment, the control equipment, and the analysis equipment are equipment belonging to the AC power supply group 520 as described above. In addition, the teacher data y tare the actual values ​​of the amount of power used by various facilities belonging to the high current power supply group 520.

[0055] The power generation amount prediction unit 210d predicts the amount of power generated by the solar panel 102. For example, the power generation amount prediction unit 210d predicts the amount of power generated by the solar panel 102 based on meteorological information acquired from the external server 230 by the information acquisition unit 210a.

[0056] The power generation prediction unit 210d may be configured with a trained model that has been machine-learned to predict the power generation amount of the solar panel 102. In this case, the learning unit 210f may, in the same manner as described above, for example, input values ​​x1, x2, x3, x4, and x5 and training data y t When the learning unit 210f creates a trained model corresponding to the power generation amount prediction unit 210d, the input values ​​x1, x2, x3, x4, and x5 are, for example, meteorological information such as the amount of solar radiation, weather, temperature, and wind force. t is the actual value of the amount of power generated by the solar panel 102. As a result, when parameters such as the amount of solar radiation, weather, temperature, and wind power are input to the created trained model, a predicted value of the amount of power generated by the solar panel 102 is output from the trained model.

[0057] The power supply control unit 210e controls power supply to the facilities belonging to the DC power supply group 510 and the facilities belonging to the AC power supply group 520 based on the first power demand, the second power demand, and the power generation amount of the solar panel 102, i.e., the predicted power generation amount.

[0058] When the predicted power generation amount is equal to or less than the first power demand amount, the power supply control unit 210e supplies the power generated by the solar panel 102 only to the equipment belonging to the DC power supply group 510. Specifically, in this case, the power supply control unit 210e turns off the AC power supply switch 116. As a result, all the power generated by the solar panel 102 is supplied to the DC power supply group 510.

[0059] For example, when the predicted value of the power demand of the air conditioners belonging to the DC power supply group 510 becomes extremely large and the predicted power generation becomes equal to or less than the first power demand, the power supply control unit 210e supplies the power generated by the solar panel 102 only to the equipment belonging to the DC power supply group 510. At this time, since the predicted power generation, the first power demand, and the second power demand are predicted, the portion of the first power demand and the second power demand that is not satisfied by the predicted power generation can also be predicted in advance. Therefore, the power supply control unit 210e can reduce the power purchased from the power company 400 by turning off at least a part of the DC device switch 114 and the AC device switch 124 based on the prediction. In this case, the power consumption of the air conditioners belonging to the DC power supply group 510 can be reduced by taking measures such as taking in outside air into the factory 500 in advance.

[0060] Furthermore, when the predicted power generation amount is greater than the first power demand amount and is equal to or less than the sum of the first power demand amount and the second power demand amount, the power supply control unit 210e preferentially supplies the power generated by the solar panel 102 to the equipment belonging to the DC power supply group 510, and supplies the surplus of the power generated by the solar panel 102 to the equipment belonging to the AC power supply group 520. Specifically, in this case, the power supply control unit 210e turns on the AC power supply switch 116. As a result, the power generated by the solar panel 102 is sent to the DC power supply group 510 to satisfy the first power demand amount. Furthermore, the surplus of the power is sent to the AC power supply group 520, and a part of the second power demand amount is satisfied by the power generated by the solar panel 102. When power is supplied to the equipment belonging to the AC power supply group 520, it is necessary to reconvert the DC power, which has been once converted to a low voltage of, for example, 210V or less in order to supply the DC power supply group 510, into AC power. For this purpose, at the input stage of the DC / AC converter 120, it is necessary to perform multi-stage boosting to convert the power to a high voltage DC power of, for example, 400 V or more, and then convert the power to AC. For this reason, a certain input impedance is generated at the input stage of the DC / AC converter 120. Therefore, when the AC power supply switch 116 is turned on, the power generated by the solar panel 102 is preferentially sent to the DC power supply group 510. Then, the surplus power after the power generated by the solar panel 102 is sent to the DC power supply group 510 is sent to the AC power supply group 520.

[0061] When a part of the second power demand is satisfied by the power generated by the solar panel 102, the remainder of the second power demand is satisfied by purchasing power from the power company 400. For example, when the predicted power generation amount is expected to be greater than the first power demand and to be equal to or less than the sum of the first power demand and the second power demand, the amount of power to be purchased from the power company 400 can be calculated in advance, and power can be supplied in a planned manner so that the second power demand of the AC power supply group 520 is satisfied. By allocating surplus DC power to AC power supply during the peak of AC usage, it is also possible to cut peak power when purchasing power to make up for a shortage of AC power. In addition, since it is possible to predict the portion of the second power demand that is not satisfied by the power generated by the solar panel 102, the power supply control unit 210e can turn off at least a part of the AC device switch 124, thereby suppressing the power purchased from the power company 400.

[0062] Furthermore, when the predicted power generation amount is greater than the sum of the first power demand and the second power demand, the power supply control unit 210e supplies the power generated by the solar panel 102 to the equipment belonging to the DC power supply group 510 and the equipment belonging to the AC power supply group 520, and supplies the surplus power generated by the solar panel 102 to the storage battery 128 for storage. Specifically, in this case, the power supply control unit 210e turns on the AC power supply switch 116 and turns on the storage battery power supply switch 118. As a result, the power generated by the solar panel 102 is sent to both the DC power supply group 510 and the AC power supply group 520, and both the first power demand and the second power demand are satisfied by the power generated by the solar panel 102. Furthermore, the surplus power generated by the solar panel 102 is stored in the storage battery 128.

[0063] Furthermore, when the predicted power generation amount is greater than the first power demand and is equal to or less than the sum of the first power demand and the second power demand, and when the SOC of the storage battery 128 is equal to or greater than a predetermined value, the power supply control unit 210e may supply the power stored in the storage battery 128 to the equipment belonging to the AC power supply group 520. In this case, specifically, the power supply control unit 210e may turn on the AC power supply switch 116 and the storage battery power supply switch 118, appropriately adjust the output voltage from the storage battery 128 by the DC / DC converter 126, and supply the power stored in the storage battery 128 to the AC power supply switch 116.

[0064] For example, when the predicted power generation amount is expected to be greater than the first power demand and equal to or less than the sum of the first power demand and the second power demand, the power supply control unit 210e uses both the power purchase from the power company 400 and the power supply from the storage battery 128 to supply power to the equipment belonging to the AC power supply group 520. At this time, the power supply control unit 210e calculates an optimal mixing ratio of the power purchase from the power company 400 and the power supply from the storage battery 128, and controls the mixing ratio of the blending unit 121 and the on / off of the storage battery power supply switch 118 based on the mixing ratio. The control of the mixing ratio of the blending unit 121 is performed based on the detection value of the sensor provided in the blending unit 121. This makes it possible to supply power in a planned manner so that the second power demand is satisfied by both the power supply by the power purchase and the power supply from the storage battery 128. The optimal mixing ratio is a mixing ratio at which the electricity charge by the power purchase is the lowest. For example, when fine weather is forecast for the next day, the predicted power generation amount and the stored power amount will increase, so that the power stored in the storage battery 128 can be intentionally used to supply power to the equipment belonging to the AC power supply group 520, thereby reducing the compensation from the power grid. This makes it possible to reduce the peak value of power purchased. When the second power demand amount is satisfied only by the power supply from the storage battery 128, power purchase from the power company 400 is not necessary.

[0065] The learning unit 210f creates a learned model corresponding to the first power demand prediction unit 210b, the second power demand prediction unit 210c, or the power generation amount prediction unit 210d, by the above-mentioned method.

[0066] The time-series flow of the above processing by the processor 210 will be described with reference to Fig. 9. First, time t is set to the current time t (step S10). Next, the first power demand prediction unit 210b predicts a first power demand (t) at time t (step S12). Next, the second power demand prediction unit 210c predicts a second power demand (t) at time t (step S14).

[0067] Next, the power generation amount prediction unit 210d predicts the power generation amount (t) of the solar panel 102 at time t (step S16). Next, it is determined whether the power generation amount (t)≦the first power demand (t) (step S18), and if the power generation amount (t)≦the first power demand (t), the power supply control unit 210e turns off the AC power supply switch 116 (step S20).

[0068] If the power generation amount (t)>the first power demand (t) in step S18, it is determined whether the power generation amount (t)≦(the first power demand (t)+the second power demand (t)) (step S22). If the power generation amount (t)≦(the first power demand (t)+the second power demand (t)), the power supply control unit 210e turns on the AC power supply switch 116 (step S24).

[0069] If the power generation amount (t)>(first power demand amount (t)+second power demand amount (t)) in step S22, the power supply control unit 210e turns on the AC power supply switch 116 and also turns on the battery power supply switch 118 (step S26). After steps S20, S24, and S26, the time t is set to t+Δt (step S28), and the processes from step S12 onwards are performed again.

[0070] As described above, according to the first embodiment, power supply to the facilities belonging to the DC power supply group 510 and the AC power supply group 520 is controlled based on the first power demand, the second power demand, and the predicted power generation amount. By controlling power supply to the facilities belonging to the DC power supply group 510 and the AC power supply group 520 based on the predicted values, it becomes possible to optimally supply power to each of the DC power supply group 510 and the AC power supply group 520 in accordance with future fluctuations in the power demand.

[0071] Second Embodiment As shown in FIG. 10, the control system 100 of the second embodiment is configured to include a solar panel 102, a connection box 104, a DC / DC converter 130, an earth leakage breaker 112, a DC equipment switch 114, an AC power supply switch 116, a storage battery power supply switch 118, a DC / AC converter 120, a blending unit 121, an earth leakage breaker 122, an AC equipment switch 124, a DC / DC converter 126, and a storage battery 128.

[0072] In the control system 100 according to the second embodiment, the DC power generated by the solar panel 102 is supplied to the equipment belonging to the DC power supply group 510 without being converted to AC. For this reason, the control system 100 does not have the DC / AC high-frequency inverter 106, the high-frequency transformer 108, and the AC / DC converter 110 shown in FIG. 3, but has a DC / DC converter 130 that changes the voltage of the DC generated by the solar panel 102. The blending unit 121 connects the output line from the DC / AC converter 120 in parallel with the AC power system AC of the power company 400, and changes the blending ratio of the output of the DC / AC converter 120 and the output of the AC power system AC under the control of the control device 200. With this configuration, the control system 100 according to the second embodiment is simpler than that of the first embodiment, and the cost of introducing the system is reduced. In addition, since AC power is supplied to the AC power supply group 520 after DC voltage is reduced by the DC / DC converter 130, the configuration of the DC / AC converter 120 for AC conversion can be low-voltage, and the wiring can be low-cost low-voltage. Therefore, from this viewpoint as well, costs are significantly reduced.

[0073] DC power generated by solar panel 102 and voltage-converted by DC / DC converter 130 is supplied to facilities belonging to DC power supply group 510. In addition, surplus DC power generated by solar panel 102 is supplied to DC / AC converter 120 when AC power supply switch 116 is on.

[0074] The function of the processor 210 in the second embodiment and the time-series flow of the processing of the processor 210 are the same as those in the first embodiment. In the second embodiment, the power supply control unit 210e of the processor 210 also controls the power supply to the facilities belonging to the DC power supply group 510 and the facilities belonging to the AC power supply group 520 based on the first power demand, the second power demand, and the predicted power generation amount of the solar panel 102. Specifically, the power supply control unit 210e controls the on / off of the AC power supply switch 116 and the on / off of the storage battery power supply switch 118 based on the first power demand, the second power demand, and the predicted power generation amount of the solar panel 102.

[0075] Therefore, in the second embodiment as well, power supply to the equipment belonging to the DC power supply group 510 and the equipment belonging to the AC power supply group 520 is optimally controlled based on the first power demand, the second power demand, and the predicted power generation amount of the solar panel 102.

[0076] As described above, according to the second embodiment, the DC power generated by the solar panel 102 is supplied to the facilities belonging to the DC power supply group 510 without being converted to AC. Therefore, the control system 100 is configured more simply, and the introduction cost of the system is reduced. [Explanation of symbols]

[0077] 100 Control System 102 Solar Panels 104 Junction box 106 DC / AC high frequency inverter 108 High Frequency Transformer 110 AC / DC Converter 112 Earth leakage breaker 114 DC device switch 116 AC power supply switch 118 Battery power supply switch 120 DC / AC Converter 121 Compounding Department 122 Earth leakage breaker 124 AC Device Switch 126 DC / DC Converter 128 Battery 130 DC / DC Converter 200 Control device 210 Processor 210a Information acquisition section 210b First power demand forecasting unit 210c Second Electricity Demand Forecasting Division 210d Power Generation Prediction Section 210e Power supply control unit 210f Learning Department 212 Memory 214 Communication Interface 220 Communication Network 230 Server 300 Power Generation Companies 350 Consumer 400 Electric Power Companies 500 Factories 510 DC Power Supply Group 520 AC Power Supply Group

Claims

1. a first power demand prediction unit that predicts a first power demand, which is a power demand of a first equipment group that operates using DC power; a second power demand prediction unit that predicts a second power demand, which is a power demand of a second equipment group that operates on AC power; a power generation amount prediction unit that predicts the amount of power generation of solar panels that supply power to the first equipment group and the second equipment group; a power supply control unit that controls power supply to the first equipment group and the second equipment group based on the first power demand, the second power demand, and the power generation amount of the solar panel; A control system comprising:

2. 2. The control system according to claim 1, wherein the power generated by the solar panels is supplied preferentially to the first equipment group over the second equipment group, and surplus power generated by the solar panels is supplied to the second equipment group.

3. The control system according to claim 1 , wherein the power supply control unit supplies the power generated by the solar panel only to the first equipment group when the amount of power generation is equal to or less than the first power demand.

4. 2. The control system according to claim 1, wherein when the amount of power generation is greater than the first power demand and is equal to or less than a sum of the first power demand and the second power demand, the power supply control unit preferentially supplies the power generated by the solar panels to the first equipment group and supplies surplus power generated by the solar panels to the second equipment group.

5. 2. The control system according to claim 1, wherein, when the amount of power generation is greater than a sum of the first power demand and the second power demand, the power supply control unit supplies the power generated by the solar panels to the first equipment group and the second equipment group, and supplies surplus power generated by the solar panels to a storage battery for storage.

6. 5. The control system according to claim 4, wherein the power supply control unit supplies the power stored in the storage battery to the second equipment group when the amount of power generation is greater than the first power demand and is equal to or less than a sum of the first power demand and the second power demand.

7. The solar panel receives sunlight and generates electricity; The first facility group to which the power generated by the solar panels is supplied; The second facility group is supplied with electricity generated by the solar panels; and The control system of claim 1 further comprising:

8. The control system according to claim 5 or 6, further comprising a storage battery that stores the power generated by the solar panel.

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