Power control system

Abstract

The invention discloses a power control system. Comprising a power generation mechanism (21) using renewable energy sources, a first DC bus (100) connected to the power generation mechanism and corresponding to a first voltage, and a DC / DC converter (110) connected to the first DC bus and capable of converting the first voltage into a second voltage lower than the first voltage, a second DC bus (200) connected to the DC / DC converter and corresponding to the second voltage; a power generation device (51) electrically connected to the second DC bus; and a power generation fuel generation device (41) electrically connected to the second DC bus and connected to the power generation device and generating fuel for power generation at the power generation device.

Description

Technical Field

[0001] The present disclosure relates to a power control system. Background Art

[0002] In recent years, the Sustainable Development Goals (SDGs) have been expanding. Based on this, the power control system that uses renewable energy such as solar energy, wind power, and geothermal energy, instead of the conventional method of generating electricity using fossil fuels such as oil, coal, and liquefied natural gas, has attracted attention.

[0003] In such power control systems, the generated power varies greatly depending on the weather, season, location, etc. In addition, the power consumption of the consumption side (load) of houses and stores, etc. also changes. Therefore, depending on the power supply and demand balance between power generation and consumption, there is a surplus or shortage of power. Therefore, recently, initiatives to stabilize power using fuel cells and water electrolysis devices are being taken. Patent document 1 discloses a direct current (DC) bus control system using a fuel cell and a water electrolysis device.

[0004] Prior art literature Patent Literature Patent Document 1: International Publication No. 2019 / 103059 In the case of a general power control system, each device is connected to a DC bus through a DC / DC converter. In addition, in the case of a fuel cell or a water electrolysis device, since the voltage specification value is lower than that of the power supply device, it is necessary to connect the DC bus to each device through two DC / DC converters. Therefore, when the water electrolysis device and the fuel cell are electrically connected, a large power loss occurs. Summary of the invention

[0005] Problem that the invention aims to solve Therefore, one of the objects of the present invention is to provide a power control system capable of suppressing power loss and stabilizing power.

[0006] Means used to solve problems According to one embodiment of the present invention, there is provided an electric power control system, comprising: a power generation mechanism using renewable energy; a first DC bus connected to the power generation mechanism and corresponding to a first voltage; a DC / DC converter connected to the first DC bus and capable of converting the first voltage into a second voltage lower than the first voltage; a second DC bus connected to the DC / DC converter and corresponding to the second voltage; a power generation device electrically connected to the second DC bus; and a power generation fuel generating device electrically connected to the second DC bus and to the power generation device to generate fuel for power generation in the power generation device.

[0007] In the above power control system, the power generation mechanism may be a solar cell.

[0008] The above-mentioned power control system may include a power storage mechanism connected to the second DC bus and configured to store the power generated by the power generation mechanism.

[0009] In the above power control system, the power generation device may be a fuel cell, and the power generation fuel generation device may be a water electrolysis device.

[0010] The above-mentioned power control system may include a control device for controlling the driving and stopping of the power generation device and the power generation fuel production device according to the voltage value of the DC current in the first DC bus.

[0011] In the above-mentioned power control system, it includes a first DC / AC converter connected to the first DC bus; a second DC / AC converter connected to the second DC bus, and a load connected to the first DC / AC converter and the second DC / AC converter. When the voltage of the first DC bus meets the specified conditions, the control device can also supply power to the load from the second DC / AC converter.

[0012] Effects of the Invention According to one embodiment of the present invention, it is possible to provide a power control system capable of suppressing power loss and stabilizing power. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a diagram showing the overall configuration of a power control system according to one embodiment of the present invention.

[0014] Figure 2 This is a block diagram of a control device according to one embodiment of the present invention.

[0015] Figure 3 This is a functional block diagram of a control unit according to one embodiment of the invention.

[0016] Figure 4 This is a flowchart of a control method according to one embodiment of the invention.

[0017] Figure 5A This is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention.

[0018] Figure 5B This is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention.

[0019] Figure 5CThis is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention.

[0020] Fig. 6A This is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention.

[0021] Figure 6B This is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention.

[0022] Figure 7 It is a schematic diagram showing the flow of power in a power control system according to one embodiment of the present invention.

[0023] Figure 8 It is a diagram showing the overall configuration of a power control system according to one embodiment of the present invention.

[0024] Fig. 9 It is a diagram showing the overall configuration of a power control system according to one embodiment of the present invention.

[0025] Fig.10 This is a flowchart of a control method according to one embodiment of the invention.

[0026] Fig.11 This is the overall structure diagram of the previous power control system. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present invention disclosed in the present application will be described with reference to the accompanying drawings. However, the present invention can be implemented in various ways without departing from the gist thereof, and should not be construed as being limited to the description of the embodiments illustrated below.

[0028] In the drawings referred to in this embodiment, the same parts or parts having the same functions are marked with the same reference numerals or similar reference numerals (only with reference numerals such as A and B added after the numbers). In addition, for the sake of convenience of explanation, the dimensional ratios in the drawings may be different from the actual ratios, or part of the structure may be omitted from the drawings.

[0029] In addition, although voltage is used for explanation in this specification, voltage may be replaced by power or current, power may be replaced by current or voltage, and current may be replaced by voltage or power.

[0030] <First Embodiment> (1-1. Configuration of Power Control System 1) Hereinafter, a power control system according to the present embodiment will be described with reference to the drawings.

[0031] Figure 1 FIG. 1 is a general diagram of the power control system 1 according to the present embodiment. Figure 1 As shown, the power control system 1 includes a control device 10, a solar power generation unit 20, a battery unit 30, a water electrolysis unit 40, a fuel cell unit 50, a first DC bus 100, a second DC bus 200, a DC / DC converter 110, a DC / AC converter 120, and a load 90.

[0032] The solar power generation unit 20 , the battery unit 30 , the DC / DC converter 110 , and the DC / AC converter 120 are directly connected to the first DC bus 100 .

[0033] The solar power generation unit 20 includes a solar cell 21 and a DC / DC converter 23. The solar cell 21 generates electricity using sunlight. The DC / DC converter 23 converts the voltage value of the DC current generated by the solar cell 21 to be suitable for the voltage value of the DC current of the first DC bus 100.

[0034] The battery unit 30 includes a battery 31 and a DC / DC converter 33. The battery 31 stores power generated by the power control system. The DC / DC converter 33 converts the voltage value of the direct current flowing through the first DC bus 100 to match the specification voltage of the battery 31 in order to store the surplus power in the power control system 1 in the battery 31.

[0035] The DC / DC converter 110 is connected to the first DC bus 100 and the second DC bus 200. The DC / DC converter 110 converts (steps down) the voltage value of the DC current flowing through the first DC bus 100 to be suitable for the voltage value of the DC current flowing through the second DC bus 200. In addition, the DC / DC converter 110 converts (steps up) the voltage value of the DC current flowing through the second DC bus 200 to be suitable for the voltage value of the DC current in the first DC bus 100. The DC voltage value flowing through the first DC bus 100 corresponds to the first voltage. The voltage value flowing through the second DC bus 200 corresponds to the second voltage. The second voltage is lower than the first voltage. In this example, the first voltage is 400V and the second voltage is 48V.

[0036] The DC / AC converter 120 converts the DC current flowing through the first DC bus 100 into AC current. The load 90 represents various devices that consume power. For example, the load 90 includes various electrical devices such as televisions, air conditioners, electric lights, washing machines, refrigerators, and personal computers.

[0037] The water electrolysis unit 40 and the fuel cell unit 50 are electrically connected to the second DC bus 200 .

[0038] The water electrolysis unit 40 includes a water electrolysis device 41 and a DC / DC converter 43. The water electrolysis device 41 generates hydrogen by electrolysis of water. The generated hydrogen is stored in a hydrogen storage device 45. The DC / DC converter 43 converts the voltage value of the direct current in the second DC bus 200 to be suitable for the specified voltage value of the water electrolysis device 41.

[0039] The fuel cell unit 50 includes a fuel cell 51 and a DC / DC converter 53. The fuel cell 51 generates electricity through an electrochemical reaction using hydrogen generated in the water electrolysis device 41 and stored in the hydrogen storage 45. The DC / DC converter 53 converts the voltage value of the direct current generated by the fuel cell 51 to be suitable for the voltage value of the direct current of the second DC bus 200.

[0040] In the above description, the water electrolysis device 41 and the fuel cell 51 are connected via the hydrogen storage device 45. Therefore, the fuel cell 51 can generate electricity using hydrogen supplied from the water electrolysis device 41. That is, the water electrolysis device 41 can generate fuel used for power generation in the fuel cell 51, and can therefore be referred to as a power generation fuel generation device.

[0041] (1-2. Control device) Figure 2 is a block diagram of the control device 10 . The control device 10 includes at least a control unit 101 , a storage unit 103 , a display unit 105 , and a communication unit 107 .

[0042] The control unit 101 controls the driving of each part of the power control system 1. The control unit 101 includes a calculation processing device such as a central processing unit (CPU) and a processor equipped with a memory such as a read-only memory (ROM) and a random access memory (RAM). The control unit 101 monitors the driving state of each unit, the voltage value of the DC current in the first DC bus 100, and the voltage value of the DC current in the second DC bus 200, and controls each device. The control unit 101 can detect abnormalities in the voltage value of the first DC bus 100 and the voltage value of the second DC bus 200 by monitoring the voltage value of the DC current in the first DC bus 100 and the voltage value of the DC current in the second DC bus 200.

[0043] As the storage unit 103, in addition to a memory, a semiconductor memory of a solid state drive (SSD), etc., a storage element such as a magnetic recording medium (a magnetic tape, a magnetic disk, etc.), an optical recording medium, a magneto-optical recording medium, a storage medium, etc. is used. The storage unit 103 has a function of storing a control program and various information used in the control program.

[0044] The display unit 105 displays control information based on the control of the control unit 101. At this time, the display unit 105 can display the control information via a graphical user interface (GUI). In addition, when an abnormality is detected in the power control system 1, the display unit 105 can display abnormality information on the display unit. In addition, depending on the state of the control device 10, the display unit 105 may not necessarily be configured.

[0045] The communication unit 107 transmits and receives information to and from each device based on the control of the control unit 101 .

[0046] Furthermore, the control device 10 may be provided with a notification unit for notifying of abnormality in addition to the control unit 101, the storage unit 103, the display unit 105, and the communication unit 107. The notification unit may be a lamp or a buzzer.

[0047] Figure 3 is a functional block diagram of the control unit 101. Figure 3 As shown, the control unit 101 includes an acquisition unit 1011 , a determination unit 1013 , and a drive instruction unit 1015 as functional units.

[0048] The acquisition unit 1011 has a function of acquiring a voltage value of a DC current in the first DC bus 100 . The acquisition unit 1011 also has a function of acquiring a voltage value of a DC current in the second DC bus 200 .

[0049] The determination unit 1013 has a function of determining whether the voltage value of the DC current satisfies a predetermined condition (whether it is a voltage higher than a reference voltage).

[0050] The drive instruction unit 1015 has a function of instructing the water electrolysis device 41 and the fuel cell 51 to drive and stop.

[0051] (1-3. Power control method) Next, a power control method will be described. Figure 4 is a flow chart of a power control method. Figure 5A 6A-C and 6A-B are schematic diagrams showing the relationship between time and voltage in the power control system 1 .

[0052] Figure 2 The control device 10 obtains a voltage value of the first DC bus 100 (step S101 ). Figure 5A 1 is a schematic diagram showing the time variation of the voltage of the first DC bus 100, and also shows the time variation of the voltage of the first DC bus 100. Figure 1 Schematic diagram of the relationship between the difference between the power of the solar power generation unit 20 and the power consumed by the load 90 and time. Figure 5AAs shown, the voltage of the first DC bus 100 always fluctuates. The control device 10 always obtains and monitors the voltage of the first DC bus 100.

[0053] Next, the control device 10 determines whether the acquired voltage satisfies a predetermined condition. Specifically, the control device 10 determines whether the acquired voltage of the first DC bus 100 is higher than the reference voltage Vo (step S103 ).

[0054] Figure 5B Schematic diagram showing the relationship between the change in voltage and time during the driving of the fuel cell 51. Figure 5B As shown, the fuel cell 51 is driven from time T1 to time T2 to increase the voltage from the reference voltage V0 by +ΔV. That is, the fuel cell 51 is driven to switch the power control system 1 to increase the voltage of the first DC bus 100 (supplement power).

[0055] Figure 5C Schematic diagram showing the relationship between voltage variation and time during the driving of the water electrolysis device 41. Figure 5C As shown, the water electrolysis device 41 is driven in the range of time T3 to time T4, and the voltage is reduced from the reference voltage V0 by -ΔV. That is, by driving the water electrolysis device 41, the power control system 1 can be switched to a direction of reducing the voltage of the first DC bus 100 (consuming power).

[0056] Fig. 6A and Figure 6B is Figure 5A Based on the relationship between the voltage and time of the first DC bus 100 shown, the Figure 5B and Figure 5C Schematic diagram of the relationship between the driving of the fuel cell and the water electrolysis device and time. In the case of this embodiment, the control device 10 switches the driving and stopping of the fuel cell 51 and the water electrolysis device 41 in response to the voltage of the first DC bus 100. Specifically, when the voltage of the first DC bus 100 is higher than the reference voltage V0 and there is surplus power, the water electrolysis device 41 is driven to generate hydrogen. Vice versa, when the voltage of the first DC bus 100 is lower than the reference voltage V0 and there is insufficient power, the fuel cell 51 is driven to supplement the power.

[0057] At this time, pay attention to Fig. 6A The time point at which the voltage of the first DC bus 100 is switched from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0. Fig. 6A In FIG. 1 , a portion where the voltage of the first DC bus 100 switches from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0 is enclosed by a dotted line, and the enclosed range is enlarged and illustrated in FIG. Figure 6BIn. Figure 6B In the example, when the voltage of the first DC bus 100 is switched from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0, a ​​period of overlap occurs in which the operation of ending the driving of the water electrolysis device 41, which is driven when the voltage of the first DC bus 100 is high, and the operation of starting the driving of the fuel cell 51, which is driven after the voltage becomes lower than the reference voltage V0, overlaps. Figure 6B As shown, when the voltage is switched, in order to always maintain the voltage of the first DC bus 100 at the reference voltage V0, the fuel cell 51 and the water electrolysis device 41 are sometimes driven simultaneously for a certain period. Specifically, when the voltage of the first DC bus 100 is switched from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0, when the voltage of the first DC bus 100 is lower than the reference voltage V0 (step S103: No), the control device 10 sends a signal for instructing the water electrolysis device 41 to stop and the fuel cell 51 to drive to the water electrolysis device 41 and the fuel cell 51 (step S107). At this time, when the water electrolysis device 41 and the fuel cell 51 are used, if the internal electrochemical reaction changes suddenly, there is a risk of damage or shortening of life. Therefore, when the control device 10 drives or stops the water electrolysis device and the fuel cell, it is preferred to change the voltage slowly, so as to generate a period in which the water electrolysis device 41 and the fuel cell 51 are driven simultaneously.

[0058] In addition, when the voltage of the first DC bus 100 becomes higher than the reference voltage V0 by switching the voltage of the first DC bus 100 from a voltage lower than the reference voltage V0 to a voltage higher than the reference voltage V0 (step S103: Yes), the control device 10 transmits a signal for instructing the stop of the fuel cell 51 and the driving of the water electrolysis device 41 to the water electrolysis device 41 and the fuel cell 51 (step S105). In this case, similar to the case where the voltage of the first DC bus 100 changes from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0, if the electrochemical reaction inside the water electrolysis device 41 and the fuel cell 51 changes rapidly, there is a possibility that the water electrolysis device 41 and the fuel cell 51 may be damaged or their lifespan may be shortened. Therefore, when driving or stopping the water electrolysis device and the fuel cell, the control device 10 preferably changes the voltage slowly, so that a period in which the water electrolysis device 41 and the fuel cell 51 are driven simultaneously occurs.

[0059] After transmitting the instruction signals to the water electrolysis device 41 and the fuel cell 51 (steps S105 and S107 ), the control device 10 returns to the process of obtaining the voltage (voltage value) of the first DC bus (step S101 ).

[0060] Thus, during the period when the water electrolysis device 41 and the fuel cell 51 are driven simultaneously, Figure 1In the embodiment, the power output from the fuel cell 51 is supplied to the first DC bus 100, and is also supplied to the water electrolysis device 41 via the second DC bus 200. Figure 7 shown.

[0061] Here, a conventional power control system is compared with the power control system according to the present embodiment. Fig.11 FIG. 5 is a diagram showing the structure of a conventional power control system 500. The conventional power control system is not like the one of the present application. Figure 1 The second DC bus 200 is provided in this manner. The rated voltage value of the water electrolysis device and the fuel cell is sometimes about 20 times lower than the voltage value of the DC current flowing through the first DC bus 100. In this case, since it is difficult to perform voltage conversion with a single DC / DC converter, in conventional power control systems, such as Fig.11 As shown, two converters, namely, a DC / DC converter 110 and a DC / DC converter 43, are arranged between the first DC bus 100 and the water electrolysis device 41. Similarly, two converters, namely, a DC / DC converter 111 and a DC / DC converter 53, are arranged between the first DC bus 100 and the fuel cell 51.

[0062] Therefore, during the period when the water electrolysis device 41 and the fuel cell 51 are driven simultaneously, power is supplied from the fuel cell 51 to the water electrolysis device 41 via four DC / DC converters (DC / DC converters 53, 111, 110, 43). At this time, each converter will generate power loss when converting the voltage. As a result, in the conventional power control system, since four DC / DC conversions are performed, the number of voltage conversions performed by the DC / DC converters is four, resulting in large power loss.

[0063] However, in the case of this embodiment, if Figure 7 As shown, the water electrolysis unit 40 and the fuel cell unit 50 are connected in parallel to the second DC bus 200. When the water electrolysis device 41 and the fuel cell 51 are driven simultaneously, when the power from the fuel cell flows to the water electrolysis device, it does not pass through the first DC bus 100 but passes through the second DC bus 200. Therefore, since the number of voltage conversions of the DC / DC converter can be reduced to two, power loss can be suppressed. That is, by using this embodiment, power loss can be suppressed and power stability can be achieved.

[0064] <Second Embodiment> In this embodiment, a power control system different from that in the first embodiment will be described. Specifically, an example in which devices other than the water electrolysis device 41 and the fuel cell 51 are connected to the second DC bus will be described.

[0065] (2-1. Configuration of Power Control System 1A) Figure 8 FIG. 1 is a general diagram of the power control system 1A according to the present embodiment. Figure 8 As shown, in addition to the control device 10, the solar power generation unit 20, the battery unit 30, the water electrolysis unit 40, the fuel cell unit 50, the first DC bus 100, the second DC bus 200, the DC / DC converter 110 and the DC / AC converter 120 and the load 90, the power control system 1A can also include a battery unit 60 and a capacitor unit 70.

[0066] In the present embodiment, in addition to the water electrolysis unit 40 and the fuel cell unit 50 , a battery unit 60 and a capacitor unit 70 are also connected to the second DC bus 200 .

[0067] The battery unit 60 includes a battery 61 and a DC / DC converter 63. The battery 61 stores the power generated in the power control system 1A. The DC / DC converter 63 converts the voltage value of the direct current flowing through the second DC bus 200 to match the specification voltage of the battery 61 in order to store the surplus power in the power control system 1A in the battery 61.

[0068] The capacitor unit 70 includes a capacitor 71 and a DC / DC converter 73. The capacitor 71 stores the power generated by the power control system 1A. The DC / DC converter 73 converts the voltage value of the direct current flowing through the second DC bus 200 to fit the specification voltage of the capacitor 71 in order to store the surplus power in the power control system 1A in the capacitor 71.

[0069] In the above, the power control system 1A includes a power storage mechanism such as the battery 61 and the capacitor 71 connected to the second DC bus 200 for storing power. Therefore, the power generated by the fuel cell 51 can be stored in the battery 61 or the capacitor 71, and the number of voltage conversions can be reduced compared to the case of storing in the battery 31. Therefore, by using this embodiment, power loss can be suppressed and power stability can be achieved.

[0070] Furthermore, in the present embodiment, in addition to the battery unit 60 and the capacitor unit 70 , other electrical devices may be directly connected to the second DC bus 200 .

[0071] <Third Embodiment> In this embodiment, a power control system different from that of the second embodiment will be described. Specifically, a DC / AC converter is connected to the second DC bus 200, and a method of supplying power to a load will be described.

[0072] (3-1. Configuration of Power Control System 1B) Fig. 9 FIG. 1 is a general diagram of the power control system 1B according to the present embodiment. Fig. 9 As shown, in addition to the control device 10, the solar power generation unit 20, the battery unit 30, the water electrolysis unit 40, the fuel cell unit 50, the first DC bus 100, the second DC bus 200, the DC / DC converter 110 and the DC / AC converter 120, the load 90, the battery unit 60 and the capacitor unit 70, the power control system 1B can also include a DC / AC converter 210.

[0073] In this embodiment, in addition to the water electrolysis unit 40 , the fuel cell unit 50 , the battery unit 60 , and the capacitor unit 70 , a DC / AC converter 210 may also be connected to the second DC bus 200 .

[0074] The DC / AC converter 210 converts the direct current flowing through the second DC bus 200 into alternating current, and supplies the alternating current to the load 90 .

[0075] (3-2. Power control method) Next, a power control method will be described. Fig.10 is a flow chart of a power control method.

[0076] The control device 10 obtains the voltage value of the first DC bus 100 (step S201 ). The control device 10 always obtains and monitors the voltage value (power value).

[0077] Next, the control device 10 determines whether the voltage value of the first DC bus satisfies a predetermined condition (step S203). Specifically, it determines whether there is an abnormality in the power control system 1B. The abnormality in this case includes an emergency, such as an instantaneous low voltage or a power outage.

[0078] In a normal state, that is, when no abnormality is detected (step S203 : NO), control device 10 instructs load 90 to supply power via DC / AC converter 120 (also referred to as a first DC / AC converter) (step S205 ).

[0079] When an abnormality is detected (step S203 : YES), control device 10 instructs power supply to load 90 via DC / AC converter 210 (also referred to as a second DC / AC converter) (step S207 ).

[0080] By using this embodiment, in the power control system, when an abnormality is detected, the second DC bus can be used as an emergency power supply, and stable power supply in an emergency can be achieved.

[0081] (Variation) Within the scope of the present invention, those skilled in the art can think of various examples of changes and modifications, and it can be understood that these examples of changes and modifications also belong to the scope of the present invention. For example, for the above-mentioned embodiments, those skilled in the art can appropriately add, delete or design elements, or add, omit or change conditions for processing, as long as they have the gist of the present invention, they are included in the scope of the present invention.

[0082] In addition, in the first embodiment of the present invention, an example in which the power control system includes a solar power generation unit is shown, but the present invention is not limited to this. For example, a unit having a power generation mechanism using wind power generation, geothermal power generation, biomass power generation, hydroelectric power generation, temperature difference power generation, or other renewable energy may be used instead of the solar power generation unit, or these power generation mechanisms may be used in combination as appropriate.

[0083] In the first embodiment of the present invention, a fuel cell is used as a power generation device and a water electrolysis device is used as a power generation fuel generation device, but the present invention is not limited to this. For example, an engine such as an internal combustion engine or an external combustion engine may also be used as a power generation device.

[0084] In the first embodiment of the present invention, an example is shown in which the reference voltage uses one reference voltage (V0) in the power generation device (fuel cell) and the power generation fuel generation device (water electrolysis device), but the present invention is not limited to this. Different reference voltage values ​​can be set for the power generation device (fuel cell) and the power generation fuel generation device (water electrolysis device). In this case, the number of unnecessary starts and stops caused by slight voltage fluctuations can be reduced.

[0085] Description of Reference Numerals 1: power control system, 10: control device, 20: solar power generation unit, 21: solar cell 23: DC / DC converter, 30: battery unit, 31: battery, 33: DC / DC converter, 40: water electrolysis unit, 41: water electrolysis device, 43: DC / DC converter, 45: hydrogen storage device, 50: fuel cell unit, 51: fuel cell, 53: DC / DC converter, 60: battery unit, 61: battery, 63: DC / DC converter, 70: capacitor unit, 71: capacitor, 73: DC / DC converter, 90: load, 100: first DC bus, 101: control unit, 103: storage unit, 105: display unit, 107: communication unit, 110: DC / DC converter, 120: DC / AC converter, 200: second DC bus, 210: DC / AC converter, 1011: acquisition unit, 1013: determination unit, 1015: drive instruction unit.

Claims

1. A power control system, wherein: include: Power generation organizations, using renewable energy; A first DC bus, connected to the power generation mechanism and corresponding to a first voltage; A DC / DC converter connected to the first DC bus and capable of converting the first voltage into a second voltage lower than the first voltage; a second DC bus connected to the DC / DC converter and corresponding to the second voltage; a power generation device, electrically connected to the second DC bus; as well as The power generation fuel generating device is electrically connected to the second DC bus and to the power generation device, and generates fuel for power generation in the power generation device.

2. The power control system according to claim 1, wherein: The power generation mechanism is a solar cell.

3. The power control system according to claim 1, wherein: An electric power storage mechanism is provided which is connected to the second DC bus and stores the electric power generated by the electric power generation mechanism.

4. The power control system according to claim 1, wherein: The power generation device is a fuel cell, The power generation fuel generating device is a water electrolysis device.

5. The power control system according to claim 1, wherein: A control device is included for controlling the driving and stopping of the power generation device and the power generation fuel generation device according to the voltage value of the DC current in the first DC bus.

6. The power control system according to claim 5, wherein: include: a first DC / AC converter connected to the first DC bus; a second DC / AC converter connected to the second DC bus; as well as a load connected to the first DC / AC converter and the second DC / AC converter, The control device supplies electric power to the load via the second DC / AC converter when the voltage of the first DC bus satisfies a prescribed condition.

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