Control System

Abstract

To supply AC whose quality is different to each apparatus according to the quality of AC required by each apparatus.SOLUTION: A control system supplies power to a plurality of apparatuses. The apparatuses are preliminarily classified into a first apparatus group and a second apparatus group. The first apparatus group is operated by first AC. The second apparatus group is operated by second AC whose distortion rate is larger than that of the first AC. The control system has a power supply control unit 212d. The power supply control unit 212d supplies the first AC by commercial power to the first apparatus group. Further, the power supply control unit 212d supplies the second AC whose distortion rate is larger than that of the first AC generated by a solar panel to the second apparatus group.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] It has been known to provide a power supply line that supplies commercial power to AC equipment, a power supply line that supplies power from a commercial power source and DC power generation equipment to AC equipment, a power supply line that supplies power from DC power generation equipment to DC equipment, and a power supply line that supplies power from a commercial power source and DC power generation equipment to DC equipment (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-41782 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, some equipment used in factories requires high-quality sine wave AC with little distortion. On the other hand, some of these equipment can operate satisfactorily with low-quality sine wave or square wave AC. For example, air conditioning equipment and heating equipment can operate satisfactorily with low-quality AC.

[0005] However, the technology described in Patent Document 1 does not assume that AC power will be supplied to each device according to the quality of AC required by each device. As a result, there is a possibility that high-quality AC will be supplied to devices that can operate satisfactorily even with low-quality AC.

[0006] In particular, when power generated by a solar power generation system is supplied to equipment that operates on alternating current, the direct current must be converted to alternating current using an inverter. If a high-performance inverter is used to improve the quality of the alternating current for equipment that can operate satisfactorily even with low-quality alternating current, there is a problem that the cost of introducing the high-performance inverter increases.

[0007] In view of the above-mentioned problems, an object of the present disclosure is to provide a control system capable of supplying AC power of different qualities to each device according to the quality of AC required by each device. [Means for solving the problem]

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

[0009] (1) A control system supplies power to a plurality of devices. The plurality of devices are pre-classified into a first device group and a second device group. The first device group operates on a first AC. The second device group operates on a second AC having a higher distortion factor than the first AC. The control system includes a power supply control unit. The power supply control unit supplies the first AC from commercial power to the first device group. The power supply control unit also supplies the second AC generated by a solar panel and having a higher distortion factor than the first AC to the second device group.

[0010] (2) The control system according to (1) above further includes a power generation amount prediction unit and a power demand acquisition unit. The power generation amount prediction unit predicts the amount of power generated by the solar panel. The power demand acquisition unit acquires the amount of power demand of the second device group. When the amount of power demand and the amount of power generated satisfy a predetermined condition, the power supply control unit supplies the first AC to the second device group.

[0011] (3) In the control system of (2) above, the power supply control unit supplies the second AC to the second device group when the amount of power generated is greater than the power demand of the second device group, and supplies the first AC to the second device group when the amount of power generated is equal to or less than the power demand of the second device group.

[0012] (4) In the control system described above in (3), when the amount of power generated is greater than the amount of power demanded by the second group of devices, the power supply control unit supplies the surplus power generated by the solar panel to the storage battery for storage.

[0013] (5) In the control system of (2) above, the plurality of devices are pre-classified into the first device group, the second device group, and a third device group. The third device group operates on a third AC having a higher distortion factor than the second AC generated by the solar panel. The power demand acquisition unit further acquires the power demand of the third device group. When the amount of power generated is greater than the sum of the power demands of the second device group and the third device group, the power supply control unit supplies the second AC to the second device group and the third AC to the third device group.

[0014] (6) In the control system described above in (5), when the amount of power generated is less than or equal to the sum of the power demands of the second device group and the third device group and is greater than the power demand of the third device group, the power supply control unit supplies the first AC to the second device group and supplies the third AC to the third device group.

[0015] (7) In the control system described above in (6), the power supply control unit supplies the first AC to the second device group and the third device group when the amount of power generated is less than or equal to the power demand of the third device group.

[0016] (8) In the control system described above in (5), when the amount of power generated is greater than the sum of the power demands of the second group of devices and the third group of devices, the power supply control unit supplies the surplus power generated by the solar panel to the storage battery for storage.

[0017] (9) The control system according to any one of (1) to (8) above further includes the solar panel that receives sunlight and generates electricity.

[0018] (10) In the control system described above in (4) or (8), the control system further includes the storage battery that stores the power generated by the solar panel.

[0019] (11) In the control system described above in (2), the power demand acquisition unit predicts the power demand of the second device group and acquires the predicted power demand.

[0020] (12) In the control system described above in (5), the power demand acquisition unit predicts the power demand of the third device group and acquires the predicted power demand.

[0021] (13) A control device of a solar power generation control system includes a power supply control unit. The control system supplies power to a plurality of devices. The plurality of devices are pre-classified into a first device group and a second device group. The first device group operates on a first AC. The second device group operates on a second AC having a higher distortion factor than the first AC. The power supply control unit supplies the first AC from commercial power to the first device group. Furthermore, the power supply control unit supplies the second AC having a higher distortion factor than the first AC generated by the solar panel to the second device group.

[0022] (14) A control method for a solar power generation control system includes a first step, a second step, and a third step. The control system supplies power to a plurality of devices. The plurality of devices are pre-classified into a first device group and a second device group. The first device group operates on a first AC. The second device group operates on a second AC having a higher distortion factor than the first AC. In the first step, a power generation amount prediction unit predicts the amount of power generated by the solar panel. In the second step, a power demand acquisition unit acquires the power demand of the second device group. In the third step, a power supply control unit supplies the second AC to the second device group when the amount of power generated is greater than the power demand of the second device group. In addition, in the third step, the power supply control unit supplies the first AC to the second device group when the amount of power generated is equal to or less than the power demand of the second device group.

[0023] (15) A program for a solar power generation control system causes a computer to function as first means, second means, and third means. The control system supplies power to a plurality of devices. The plurality of devices are pre-classified into a first device group and a second device group. The first device group operates on a first AC. The second device group operates on a second AC having a higher distortion factor than the first AC. The first means predicts the amount of power generated by the solar panels. The second means acquires the power demand of the second device group. The third means supplies the second AC to the second device group when the amount of power generated is greater than the power demand of the second device group. Furthermore, the third means supplies the first AC to the second device group when the amount of power generated is equal to or less than the power demand of the second device group. [Effects of the Invention]

[0024] According to the present disclosure, a control system is provided that is capable of supplying AC power of different qualities to each device according to the quality of AC required by each device. [Brief explanation of the drawings]

[0025] [Figure 1]FIG. 1 is a schematic diagram showing an example of the configuration of a fully self-consumption on-site PPA. [Figure 2] 1 is a schematic diagram showing the exterior of a factory equipped with a control system according to an embodiment of the present disclosure. [Figure 3] This figure shows the maximum allowable harmonic current and distortion rate for Class A, Class B, and Class C as specified in the Agency for Natural Resources and Energy's "Guidelines for Harmonic Suppression Measures for Home Appliances and General-Purpose Products (December 2000)." [Figure 4] FIG. 1 is a schematic diagram illustrating a configuration of a control system according to an embodiment. [Figure 5] FIG. 2 is a schematic diagram showing the configuration of a control device and its peripherals. [Figure 6] FIG. 2 is a functional block diagram of a processor. [Figure 7] 10 is a diagram for explaining power supply to devices in a high-quality device group, a medium-quality device group, and a low-quality device group by a power supply control unit of a processor. FIG. [Figure 8] FIG. 1 is a schematic diagram showing an example of the configuration of a simplified DC / AC high frequency inverter. [Figure 9] 4 is a flowchart showing a process performed by a processor of the control device. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, several 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 will be given the same reference numerals, and duplicate descriptions will be omitted as appropriate.

[0027] As an example, a solar power generation control system 100 according to this embodiment includes a solar panel 102 and a storage battery 114, and is used in the form of a completely self-consumption on-site PPA. In an 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 electricity generated by the control system 100 to the consumer 350 on-site. The power generation company 300 and the consumer 350 conclude a power purchase agreement, or 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 electricity charges to the power generation company 300.

[0028] In the case of a completely self-consumption type, all of the power generated by the control system 100 is 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.

[0029] If the amount of power generated by the control system 100 is in excess of the amount of power required by the consumer 350, the surplus is stored in the storage battery 114. If 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 114. Alternatively, the shortfall may be made up by the consumer 350 purchasing power from an existing power company 400.

[0030] In this embodiment, a case where the consumer 350 is a factory owner is exemplified. The power generation company 300 installs the control system 100 in a factory 500 shown in FIG. 2 . Note that the consumer 350 may be a party other than the factory owner, and the control system 100 may be installed in a facility or building other than the factory 500. The solar panel 102 of the control system 100 is installed on the roof of the factory 500, for example. The control system 100 supplies solar-generated electricity to various facilities provided in the factory 500.

[0031] The factory 500 is equipped with multiple pieces of equipment that operate on AC, and the multiple pieces of equipment are pre-classified into equipment belonging to a high-quality equipment group 510, equipment belonging to a medium-quality equipment group 520, and equipment belonging to a low-quality equipment group 530 according to the quality of the AC supplied. The equipment belonging to the high-quality equipment group 510 operates on AC from commercial power. The equipment belonging to the medium-quality equipment group 520 is capable of operating on AC generated by the solar panels 102 and of lower quality than commercial power. The equipment belonging to the low-quality equipment group 530 is capable of operating on AC generated by the solar panels 102 and of even lower quality than the AC on which the equipment in the medium-quality equipment group 520 operates. Here, "low quality AC" refers to, for example, a high distortion rate of the AC. The equipment belonging to the medium-quality equipment group 520 is capable of operating on AC with a higher distortion rate than commercial power, and the equipment belonging to the low-quality equipment group 530 is capable of operating on AC with an even higher distortion rate than the AC on which the equipment in the medium-quality equipment group 520 operates.

[0032] As described above, the control system 100 includes a first device group that operates on a first AC from commercial power, a second device group that operates on a second AC that is power generated by the solar panel 102 and has a higher distortion factor than the first AC, and a third device group that operates on a third AC that is power generated by the solar panel 102 and has a higher distortion factor than the second AC. As an example, the distortion factor of the second AC is greater than 5% and less than or equal to 8%, and the distortion factor of the third AC is greater than 8%.

[0033] Note that when the control system 100 includes the high quality equipment group 510 and only one of the medium quality equipment group 520 and the low quality equipment group 530, the first equipment group is the high quality equipment group 510, and the second equipment group is either the medium quality equipment group 520 or the low quality equipment group 530. Also, when the low quality equipment group 530 is integrated into the medium quality equipment group 520, the first equipment group is the high quality equipment group 510, and the second equipment group is an equipment group formed by integrating the medium quality equipment group 520 and the low quality equipment group 530.

[0034] Here, the AC sine wave is expressed by the following equation (1).

[0035]

number

[0036] In equation (1), b0 is the DC component, A1, A2, A3, A n is the amplitude of the sine wave, ω is the angular frequency of the fundamental wave, t is time, and Θ is the phase. However, in power systems, harmonics with even n often do not occur. The distortion factor is a percentage of the fundamental wave input current, and is expressed as A to A1. n The ratio (=A n / A1). More specifically, the distortion factor of AC can be expressed as the ratio of the effective values of the fundamental wave and all harmonics, and can be measured using a distortion factor meter. In this embodiment, the distortion factor of AC may also be defined as the distortion factor of the fifth harmonic (=A5 / A1). For example, if a fundamental wave voltage of 200V (60Hz) contains a 300Hz, 10V sine wave component, A5 / A1=0.05, and the distortion factor of the fifth harmonic is 5%.

[0037] As another example, the equipment belonging to the high-quality equipment group 510 may be Class A equipment as defined in the Agency for Natural Resources and Energy's "Guidelines for Harmonic Suppression Measures for Home Appliances and General-Purpose Products (December 2000)." Class A equipment includes balanced three-phase equipment and all equipment that does not belong to other classes, such as vacuum cleaners and high-pressure washers. The equipment belonging to the medium-quality equipment group 520 may be Class B equipment as defined in the same guidelines. Class B equipment includes handheld power tools, portable tools, arc welders, and the like. The equipment belonging to the low-quality equipment group 530 may be Class C equipment as defined in the same guidelines. Class C equipment includes lighting equipment, and the like.

[0038] According to the above guidelines, the allowable limits for harmonics in each class, Class A, Class B, and Class C, are specified as shown in Figure 3. Harmonics in the input current of Class A equipment must not exceed the maximum allowable harmonic current shown in Figure 3, and harmonics in the input current of Class B equipment must not exceed the maximum allowable harmonic current shown in Figure 3 (1.5 times the maximum harmonic current of Class A equipment). Furthermore, harmonics in the input current of Class C equipment must not exceed the maximum distortion factor shown in Figure 3.

[0039] As described above, in this embodiment, the multiple devices in the factory 500 are classified in advance according to the quality of the AC supplied, and high-quality, medium-quality, and low-quality AC are supplied to the respective groups. Supplying power generated by the solar panel 102 to the devices in the high-quality device group 510 requires a high-performance inverter to improve the quality of the AC. Meanwhile, the devices in the medium-quality device group 520 and the low-quality device group 530 can operate without sufficiently improving the quality of the AC generated by the solar panel 102. Therefore, by supplying high-quality commercial AC to the high-quality device group 510 and AC generated by the solar panel 102 to the medium-quality device group 520 and the low-quality device group 530, a high-performance inverter is not required, simplifying the inverter configuration.

[0040] 4 , the control system 100 includes a solar panel 102, a junction box 104, a ground fault circuit interrupter 106, a DC / AC high frequency inverter 108, a DC / AC high frequency inverter 110, a battery power feed switch 112, a battery 114, a high-quality equipment power feed switch 120, a high-quality equipment individual switch 122, a medium-quality equipment power feed switch 124, a medium-quality equipment individual switch 126, a low-quality equipment power feed switch 128, a low-quality equipment individual switch 130, a zero-phase voltage detector (ZPD) 140, a power purchase breaker 142, a reverse power relay (RPR) 144, a high-frequency transformer 146, and a control device 200. The control system 100 also includes devices belonging to a high-quality equipment group 510, a medium-quality equipment group 520, and a low-quality equipment group 530. However, these devices may be configured separately from the control system 100. In FIG. 3 , solid lines indicate power lines. Furthermore, dashed arrows extending from the control device 200 to the high-quality equipment power supply switch 120, the high-quality equipment individual switch 122, the medium-quality equipment power supply switch 124, the medium-quality equipment individual switch 126, the low-quality equipment power supply switch 128, and the low-quality equipment individual switch 130 indicate signal lines through which control signals for driving these switches are transmitted. These switches are electromagnetic switches driven in response to control signals. Dashed lines extending from the control device 200 to the DC / AC high-frequency inverter 108, the DC / AC high-frequency inverter 110, the zero-phase voltage detector 140, and the reverse power relay 144 indicate signal lines through which control signals for driving these switches are transmitted. Furthermore, dashed lines extending from the reverse power relay 144 to the power lines indicate CT (Current Transformer) lines used to transform a large current into a small current.

[0041] The solar panel 102 receives sunlight and generates electricity. The solar panel 102 is made up of multiple solar cell modules, each of which is made up of multiple solar cell cells. The solar cell receives sunlight and converts solar energy into electricity. The junction box 104, for example, combines the output cables that extract the DC output generated by each solar cell module into a single cable. The earth leakage breaker 106 cuts off the DC current when it becomes excessive.

[0042] In addition, commercial power is supplied to the control system 100 from a power company 400. The commercial power supplied from the power company 400 is fed to the devices belonging to the high-quality device group 510. The commercial power is supplied to a high-frequency transformer 146 via a power purchase breaker 142. The commercial power is, for example, 3φ3W 6.6 kV. The power purchase breaker 142 cuts off the commercial power current when it becomes excessive. A zero-phase sequence voltage detector 140 detects the neutral point voltage of the commercial power. A reverse power relay 144 detects reverse power based on the neutral point voltage. When the reverse power relay 144 detects reverse power, a reverse power flow is occurring, so the medium-quality equipment power supply switch 124 and the low-quality equipment power supply switch 128 are turned off.

[0043] The high-frequency transformer 146 transforms the AC commercial power to a desired voltage. When the high-quality device power supply switch 120 is on, the AC output from the high-frequency transformer 146 is supplied to the devices in the high-quality device group 510. Specifically, when the high-quality device power supply switch 120 is on, the AC power output from the high-frequency transformer 146 is supplied to the devices whose high-quality device individual switches 122 are on, depending on the on / off state of each of the high-quality device individual switches 122. In this embodiment, since the high-quality device group 510 is always supplied with commercial power, the high-quality device power supply switch 120 may be always on.

[0044] Meanwhile, the DC power generated by solar panel 102 is supplied to DC / AC high frequency inverter 108, DC / AC high frequency inverter 110, and battery power feed switch 118. DC / AC high frequency inverter 108 and DC / AC high frequency inverter 110 convert the power generated by solar panel 102 from DC to AC and output AC power. The AC power output from DC / AC high frequency inverter 108 is supplied to the devices in medium-quality equipment group 520 when medium-quality equipment power feed switch 124 is off. Specifically, when medium-quality equipment power feed switch 124 is off, the AC power output from DC / AC high frequency inverter 108 is supplied to the devices whose medium-quality equipment individual switches 126 are on, depending on the on / off state of each medium-quality equipment individual switch 126. On the other hand, when the medium-quality equipment power supply switch 124 is on, the AC power output from the high-frequency transformer 146 is supplied to the equipment whose medium-quality equipment individual switch 126 is on, depending on the on / off state of each medium-quality equipment individual switch 126. As will be described in detail later, the on / off of the medium-quality equipment power supply switch 124 is controlled by the control device 200.

[0045] DC / AC high frequency inverter 108 outputs a second AC current of sufficient quality to operate the equipment in medium quality equipment group 520. When the equipment in medium quality equipment group 520 is class B equipment shown in FIG. 3, DC / AC high frequency inverter 108 is configured so that the harmonic current of the output AC is equal to or less than the maximum allowable harmonic current of class B shown in FIG.

[0046] Similarly, when the low-quality equipment power supply switch 128 is off, the AC power output from the DC / AC high frequency inverter 110 is supplied to the equipment in the low-quality equipment group 530. Specifically, when the low-quality equipment power supply switch 128 is off, the AC power output from the DC / AC high frequency inverter 110 is supplied to the equipment whose low-quality equipment individual switch 130 is on, in accordance with the on / off state of each of the low-quality equipment individual switches 130. On the other hand, when the low-quality equipment power supply switch 128 is on, the AC power output from the high-frequency transformer 146 is supplied to the equipment whose low-quality equipment individual switch 130 is on, in accordance with the on / off state of each of the low-quality equipment individual switches 130. As will be described in detail later, the on / off of the low-quality equipment power supply switch 128 is controlled by the control device 200.

[0047] DC / AC high frequency inverter 110 outputs a third AC current of sufficient quality to operate the equipment in low-quality equipment group 530. When the equipment in low-quality equipment group 530 is class C equipment shown in FIG. 3, DC / AC high frequency inverter 110 is configured so that the harmonic distortion rate of the output AC current is within the allowable limits for the distortion rate of class C shown in FIG. 3.

[0048] As described above, the second AC output from DC / AC high frequency inverter 108 and the third AC output from DC / AC high frequency inverter 110 are of lower quality than the first AC of the commercial power. Furthermore, the third AC output from DC / AC high frequency inverter 110 is of lower quality than the second AC output from DC / AC high frequency inverter 108. By grouping the equipment in factory 500 according to the quality of the AC supplied, even with this configuration, the equipment in medium-quality equipment group 520 and low-quality equipment group 530 can each operate sufficiently. Therefore, the configurations of DC / AC high frequency inverter 108 and DC / AC high frequency inverter 110 can be simplified, reducing manufacturing costs.

[0049] In particular, DC / AC high frequency inverter 110 can be configured even more simply than DC / AC high frequency inverter 110. The alternating current output from DC / AC high frequency inverter 110 may be, for example, a square wave, depending on the performance of the devices in low-quality device group 530.

[0050] Battery power supply switch 112 is a switch for supplying surplus power to battery 114 as needed when power generated by solar panel 102 is supplied to devices in medium-quality equipment group 520 and low-quality equipment group 530. As will be described in detail later, battery power supply switch 112 is controlled to be turned on or off by control device 200.

[0051] 5, the control device 200 includes a processor 210 as a computer, 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 unit, a numerical calculation unit, or a graphics processing unit.

[0052] 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.

[0053] The communication interface 214 has an interface circuit for connecting the control device 200 to components of the control system 100, such as the high-quality equipment power feed switch 120, the medium-quality equipment power feed switch 124, the low-quality equipment power feed switch 128, and the battery power feed switch 118. The communication interface 214 also has an interface circuit for connecting the control device 200 to an external communication network 220, such as the Internet.

[0054] 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.

[0055] As shown in Fig. 6, the processor 210 includes an information acquisition unit 210a, a power demand acquisition unit 210b, a power generation amount prediction unit 210c, a power supply control unit 210d, and a learning unit 210e. Each of these units included in the processor 210 is a functional module implemented by, for example, a computer program running on the processor 210. 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, i.e., software. The program may be recorded in the memory 212 included in the control device 200 or in 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.

[0056] The information acquisition unit 210a acquires various pieces of information transmitted from the server 230 via the communication network 220. The information acquisition unit 210a also acquires various pieces of information related to the control system 100, such as the state of charge of the storage battery 114, i.e., SOC (State of Charge).

[0057] The power demand obtaining unit 210b obtains the power demand of each of the high-quality equipment group 510, the medium-quality equipment group 520, and the low-quality equipment group 530.

[0058] For example, there is a case where the power demand amounts of the high-quality equipment group 510, the medium-quality equipment group 520, and the low-quality equipment group 530 are determined in advance in a demand plan. In this case, the power demand acquisition unit 210b acquires the power demand amounts of the high-quality equipment group 510, the medium-quality equipment group 520, and the low-quality equipment group 530 from the demand plan. The demand plan may be stored in the memory 212 of the control device 200.

[0059] Furthermore, the power demand obtaining unit 210b may predict the amount of power demand for each of the high-quality device group 510, the medium-quality device group 520, and the low-quality device group 530, and obtain the predicted amount of power demand.

[0060] The power demand acquisition unit 210b may be configured with a trained model that has been machine-learned to predict the power demand. In this case, the learning unit 210e may acquire, 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 obtained, and if the output value from the output layer for this input value is y, if the square error is used as the error function, the square error E is E=(1 / 2)·(yy t ) 2 It can be calculated as follows.

[0061] The learning unit 210e inputs the input values included in the data set to the neural network, and compares the obtained output value y with the training data y included in the data set. t Then, the learning unit 210e calculates the weight w and bias b of each node by performing calculations such as backpropagation or stochastic gradient descent to minimize the sum of squared errors E obtained from multiple learning datasets, thereby creating a trained model. Note that if training data cannot be detected, the learning unit 210e may create a trained model by unsupervised learning or reinforcement learning.

[0062] When the learning unit 210e creates a trained model for predicting the power demand of the high-quality equipment group 510, the input values x1, x2, x3, x4, and x5 are, for example, parameters such as the shipment volume of various products manufactured in the factory 500, the production plan, the operating status of the equipment belonging to the high-quality equipment group 510, the operating time and the accumulated usage time indicating the degree of deterioration of the equipment, the room temperature, and the outside temperature. Here, the production plan may include the planned shipment volume and the process plan. In addition, the training data y t is the actual value of the amount of power used by the equipment belonging to the high-quality equipment group 510. As a result, when parameters such as the planned shipment volume of various products, the operation schedule of various equipment, time, and temperature are input into the created trained model, a predicted value of the amount of power demand for the high-quality equipment group 510 is output from the trained model.

[0063] The power generation amount prediction unit 210c predicts the amount of power generated by the solar panel 102. For example, the power generation amount prediction unit 210c predicts the amount of power generated by the solar panel 102 based on weather information acquired by the information acquisition unit 210a from the external server 230.

[0064] The power generation amount prediction unit 210c 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 210e may, as in the above, use, for example, input values x1, x2, x3, x4, and x5 and training data y t When the learning unit 210e creates a trained model corresponding to the power generation amount prediction unit 210c, 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 power. 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 into the created trained model, a predicted value of the amount of power generated by the solar panel 102 is output from the trained model.

[0065] The power supply control unit 210d supplies a first AC power from commercial power to the first device group, and supplies a second AC power having a higher distortion rate than the first AC power generated by the solar panel 102 to the second device group. Specifically, the power supply control unit 210d supplies the first AC power to the second device group when the power demand and predicted power generation amount of the second device group satisfy predetermined conditions. In the following description, it is assumed that the power supply control unit 210d always supplies the first AC power from commercial power to the first device group, and controls the high-quality device power supply switch 120 to be always on.

[0066] Furthermore, when the control system 100 includes a first device group and a second device group, if the predicted power generation amount is greater than the power demand of the second device group, the power supply control unit 210d supplies the second device group with the second AC. Furthermore, if the predicted power generation amount is equal to or less than the power demand of the second device group, the power supply control unit 210d supplies the first AC to the second device group. For example, when the control system 100 includes a high-quality device group 510 as the first device group and a medium-quality device group 520 as the second device group, the power supply control unit 210d turns off the medium-quality device power supply switch 124 if the predicted power generation amount is equal to or less than the power demand of the second device group. As a result, commercial power is sent to the medium-quality device group 520, and the power demand of the medium-quality equipment group 520 is met.

[0067] Furthermore, when control system 100 includes a first device group and a second device group, if the predicted power generation amount is equal to or less than the power demand of the second device group and the SOC of storage battery 114 is equal to or greater than a predetermined value, power supply control unit 210d may supply the power stored in storage battery 114 to the second device group. In this case, power supply control unit 210d turns off medium-quality device power supply switch 124 and turns on storage battery power supply switch 112. As a result, the power stored in storage battery 114 is sent to medium-quality equipment group 520.

[0068] Furthermore, when the control system 100 includes a first device group and a second device group, if the predicted power generation amount is greater than the power demand of the second device group, the power supply control unit 210d supplies surplus power generated by the solar panel 102 to the storage battery 114 for storage. Specifically, the power supply control unit 210d turns on the storage battery power supply switch 112. As a result, the surplus power generated by the solar panel 102 is stored in the storage battery 114.

[0069] Furthermore, when control system 100 includes first, second, and third device groups, if the predicted power generation amount is greater than the total power demand of the second and third device groups, power supply control unit 210d supplies the second device group with the second AC and the third AC to the third device group. Specifically, power supply control unit 210d turns off medium-quality device power supply switch 124 and low-quality device power supply switch 128. As a result, power generated by solar panel 102 is sent to devices in medium-quality equipment group 520 and low-quality equipment group 530, and the power demand of medium-quality equipment group 520 and low-quality equipment group 530 is met.

[0070] Furthermore, when the control system 100 includes first, second, and third device groups, if the predicted power generation amount is equal to or less than the sum of the power demands of the second and third device groups and is greater than the power demand of the third device group, the power supply control unit 210d supplies the first AC to the second device group and the third AC to the third device group. Specifically, the power supply control unit 210d turns on the medium-quality device power supply switch 124 and turns off the low-quality device power supply switch 128. As a result, commercial power is supplied to the devices in the medium-quality device group 520, thereby satisfying the power demand of the medium-quality device group 520. Furthermore, power generated by the solar panel 102 is supplied to the devices in the low-quality device group 530, thereby satisfying the power demand of the low-quality equipment group 530.

[0071] Furthermore, when control system 100 includes first, second, and third device groups, if the predicted power generation amount is equal to or less than the power demand of the third device group, power supply control unit 210d supplies the first AC to the second and third device groups. Specifically, power supply control unit 210d turns on both medium-quality device power supply switch 124 and low-quality device power supply switch 128. This sends commercial power to the devices in medium-quality device group 520 and low-quality device group 530, satisfying the power demand of medium-quality device group 520 and low-quality device group 530.

[0072] Furthermore, when the control system 100 includes first, second, and third device groups, if the predicted power generation amount is greater than the total power demand of the second device group and the third device group, the power supply control unit 210d supplies surplus power generated by the solar panel 102 to the storage battery 114 for storage. Specifically, the power supply control unit 210d also turns on the storage battery power supply switch 112. As a result, the surplus power generated by the solar panel 102 is stored in the storage battery 114.

[0073] In addition, the power supply control unit 210d may turn off the DC / AC high frequency inverter 108 when the medium-quality equipment power supply switch 124 is turned on, and may turn off the DC / AC high frequency inverter 110 when the low-quality equipment power supply switch 124 is turned on.

[0074] When the power demand acquisition unit 210b predicts the power demand of each device group, the power supply control unit 210d controls the power supply to each device group and the storage battery 114 based on the predicted values of the power demand and the amount of power generation. Therefore, the power supply to each device group and the storage battery 114 is optimally controlled in accordance with future fluctuations in the power demand and the amount of power generation.

[0075] The learning unit 210e creates a learned model equivalent to the power demand acquisition unit 210b or the power generation amount prediction unit 210c using the above-mentioned method.

[0076] An example of power supply to devices in high-quality equipment group 510, medium-quality equipment group 520, and low-quality equipment group 530 according to predicted power generation and power demand will be described. As an example, in Fig. 7, the devices in low-quality equipment group 530 are Lighting 1, Lighting 2, a refrigerator, and a freezer. The devices in medium-quality equipment group 520 are Microscope 1, Microscope 2, and tools. The devices in high-quality equipment group 510 are three-phase 200V devices, a high-pressure washer, an inspection device, and an analysis device.

[0077] 7, when the amount of power generation > (power demand of high-quality equipment group 510 + power demand of medium-quality equipment group 520 + power demand of low-quality equipment group 530), solar-powered power is supplied to the devices in low-quality equipment group 530 and medium-quality equipment group 520. On the other hand, commercial power is supplied to the devices in high-quality equipment group 510. In this case, surplus power generated by solar panel 102 is stored in storage battery 114.

[0078] Furthermore, even when (power demand of high-quality equipment group 510 + power demand of medium-quality equipment group 520 + power demand of low-quality equipment group 530)≧power generation amount>(power demand of medium-quality equipment group 520 + power demand of low-quality equipment group 530), solar-powered power is supplied to the devices in low-quality equipment group 530 and medium-quality equipment group 520. On the other hand, commercial power is supplied to the devices in high-quality equipment group 510. In this case, surplus power generated by solar panel 102 is stored in storage battery 114.

[0079] Furthermore, if (power demand of medium-quality equipment group 520 + power demand of low-quality equipment group 530)≧power generation amount>power demand of low-quality equipment group 530, solar power is supplied to the devices in low-quality equipment group 530. On the other hand, commercial power is supplied to the devices in high-quality equipment group 510 and medium-quality equipment group 520. In this case, power is not stored in storage battery 114.

[0080] Furthermore, when the amount of power generated is less than or equal to the amount of power demanded by low-quality equipment group 530, commercial power is supplied to all of the devices in high-quality equipment group 510, medium-quality equipment group 520, and low-quality equipment group 530. In this case, power is not generally stored in storage battery 114. However, because commercial power is supplied to all of high-quality equipment group 510, medium-quality equipment group 520, and low-quality equipment group 530, storage battery power supply switch 112 may be turned on to store the power generated by solar panel 102 in storage battery 114.

[0081] If the amount of power generation is greater than the total power demand of high-quality equipment group 510, medium-quality equipment group 520, and low-quality equipment group 530, it is theoretically possible to supply power generated by solar panel 102 to all of the high-quality, medium-quality, and low-quality equipment. However, even in such a case, in this embodiment, commercial power is supplied to the equipment in high-quality equipment group 510. Therefore, for example, if high-quality equipment group 510 is made up of Class A equipment shown in FIG. 3, the harmonics of the input current of the equipment in high-quality equipment group 510 will reliably satisfy the maximum allowable harmonic current shown in FIG. 3.

[0082] With the above-described configuration of the control system 100, the DC / AC high frequency inverter 108 and the DC / AC high frequency inverter 110 are configured as simple inverters. FIG. 8 shows an example of the configuration of the DC / AC high frequency inverter 110, which is a low-cost inverter with a DC to AC conversion efficiency of 98.5% or more. Although the configuration shown in FIG. 8 does not include a smoothing LC filter, a hierarchical control circuit, and the like that are normally installed, even such a simplified configuration can be applied to the DC / AC high frequency inverter 110. Note that FIG. 8 shows the connection state between the solar panel 102 and the DC / AC high frequency inverter 110, and does not show the connection box 104 and the earth leakage breaker 106. In FIG. 8, e i is the inverter output voltage, e L is the reactor voltage drop, e c is the power system voltage, i c indicates the inverter output current.

[0083] Next, the chronological flow of processing by processor 210 will be described with reference to Fig. 9. First, time t is set to the current time t (step S10). Next, power demand acquisition unit 210b acquires the power demand (At) of high-quality equipment group 510 at time t (step S12). Next, power demand acquisition unit 210b acquires the power demand (Bt) of medium-quality equipment group 520 at time t (step S14). Next, power demand acquisition unit 210b acquires the power demand (Ct) of low-quality equipment group 530 at time t (step S16).

[0084] Next, the power generation amount prediction unit 210c predicts the power generation amount (Gt) of the solar panel 102 at time t (step S18). Next, it is determined whether Gt>At+Bt+Ct (step S20). If Gt>At+Bt+Ct, the power supply control unit 210d turns on the high-quality device power supply switch 120, turns off the medium-quality device power supply switch 124 and the low-quality device power supply switch 128, and turns on the storage battery power supply switch 112 (step S22).

[0085] If Gt≦At+Bt+Ct in step S20, it is determined whether Gt>Bt+Ct (step S24). If Gt>Bt+Ct, the power supply control unit 210d turns on the high-quality device power supply switch 120, turns off the medium-quality device power supply switch 124 and the low-quality device power supply switch 128, and turns on the storage battery power supply switch 112 (step S26).

[0086] If Gt≦Bt+Ct in step S24, it is determined whether Gt>Ct (step S28). If Gt>Ct, the power supply control unit 210d turns on the high-quality device power supply switch 120 and the medium-quality device power supply switch 124, turns off the low-quality device power supply switch 128, and turns off the battery power supply switch 112 (step S30).

[0087] If Gt≦Ct in step S28, power supply control unit 210d turns on high-quality equipment power supply switch 120, medium-quality equipment power supply switch 124, and low-quality equipment power supply switch 128, and turns off storage battery power supply switch 112 (step S32). Note that because commercial power is supplied to all of high-quality equipment group 510, medium-quality equipment group 520, and low-quality equipment group 530, storage battery power supply switch 112 may be turned on and the power generated by solar panel 102 may be stored in storage battery 114. After steps S22, S26, S30, and S32, time t is set to t+Δt (step S34), and the processing from step S12 onwards is performed again.

[0088] As described above, according to this embodiment, the power supply control unit 212d of the processor 212 supplies the first device group with a first AC powered by commercial power, and supplies the second device group with a second AC power having a higher distortion factor than the first AC power generated by the solar panel 102. This simplifies the configuration of the inverter that converts the DC power of the solar panel 102 into AC power, thereby reducing the manufacturing cost of the control system 100. [Explanation of symbols]

[0089] 100 Control System 102 Solar Panels 104 Junction box 106 Earth leakage breaker 108 DC / AC high frequency inverter 110 DC / AC high frequency inverter 112 Battery power supply switch 114 Storage battery 116 AC power supply switch 118 Battery power supply switch 120 High-quality equipment power supply switch 122 high quality equipment individual switches 124 Medium Quality Equipment Power Supply Switch 126 Medium Quality Equipment Individual Switch 128 Low-quality equipment power supply switch 130 Low-quality equipment individual switch 140 Zero-phase voltage detector (ZPD) 140 Zero-phase voltage detector 142 Power purchase breaker 144 Reverse Power Relay (RPR) 146 High Frequency Transformer 200 control device 210 processors 210a Information acquisition section 210b Electricity demand acquisition section 210c Power generation forecast section 210d Power supply control unit 210e 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 High Quality Equipment Group 520 Medium Quality Equipment Group 530 Low Quality Equipment Group

Claims

1. A control system that supplies power to a plurality of devices that are pre-classified into a first device group that operates on a first AC and a second device group that operates on a second AC having a distortion factor greater than that of the first AC, a power supply control unit that supplies the first AC power generated by commercial power to the first device group and supplies the second AC power generated by a solar panel and having a distortion rate higher than that of the first AC power to the second device group; a power generation amount prediction unit that predicts the power generation amount of the solar panel; a power demand acquisition unit that acquires the power demand of the second device group, The power supply control unit a control system that supplies the first AC power to the second device group when the magnitude relationship between the power demand amount and the power generation amount satisfies a predetermined condition.

2. 2. The control system according to claim 1, wherein the power supply control unit supplies the second AC to the second device group when the amount of power generation is greater than the power demand of the second device group, and supplies the first AC to the second device group when the amount of power generation is equal to or less than the power demand of the second device group.

3. 3. The control system according to claim 2, wherein when the amount of power generated is greater than the amount of power demand of the second device group, the power supply control unit supplies surplus power generated by the solar panel to a storage battery for storage.

4. The plurality of devices are pre-classified into the first device group, the second device group, and a third device group that operates on a third AC having a distortion factor greater than that of the second AC generated by the solar panel, the power demand acquisition unit further acquires the power demand of the third device group; The power supply control unit 2. The control system according to claim 1, wherein when the amount of power generation is greater than the sum of the power demands of the second device group and the third device group, the second AC is supplied to the second device group and the third AC is supplied to the third device group.

5. The power supply control unit 5. The control system according to claim 4, wherein when the amount of power generation is equal to or less than the sum of the power demands of the second device group and the third device group and is greater than the power demand of the third device group, the first AC is supplied to the second device group and the third AC is supplied to the third device group.

6. The power supply control unit The control system according to claim 5 , wherein when the amount of power generation is equal to or less than the amount of power demand of the third device group, the first AC is supplied to the second device group and the third device group.

7. 5. The control system according to claim 4, wherein when the amount of power generated is greater than the sum of the power demands of the second device group and the third device group, the power supply control unit supplies surplus power generated by the solar panel to a storage battery for storage.

8. The control system according to claim 1 , wherein the power demand acquisition unit predicts a power demand of the second device group and acquires the predicted power demand.

9. The control system according to claim 4 , wherein the power demand acquisition unit predicts the power demand of the third device group and acquires the predicted power demand.

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