Power Control System

Abstract

A power control system (1) includes: a power generation mechanism (21) using a renewable energy; a first DC bus line (100) that is connected to the power generation mechanism and corresponds to a first voltage; a DC / DC conversion device (110) that is connected to the first DC bus line and can convert the first voltage to a second voltage lower than the first voltage; a second DC bus line (200) that is connected to the DC / DC conversion device and corresponds to the second voltage; a power generation device (51) that is electrically connected to the second DC bus line; and a power generation fuel generation device (41) that is electrically connected to the second DC bus line, is connected to the power generation device, and generates a fuel used in the power generation device to generate power.

Description

[Technical Field]

[0001] The present disclosure relates to power control systems. [Background technology]

[0002] In recent years, efforts to achieve the Sustainable Development Goals (SDGs) have been expanding. As a result, attention is being paid to power control systems that utilize renewable energy sources such as solar, wind, and geothermal power, rather than the conventional method of generating electricity using fossil fuels such as oil, coal, and liquefied natural gas.

[0003] In this type of power control system, the amount of power generated fluctuates greatly depending on factors such as weather, season, and location. Furthermore, the power consumption of the consumer (load) such as homes and stores also fluctuates. This results in a power surplus or shortage depending on the balance between power generation and power consumption. Therefore, efforts have recently been made to stabilize power supply using fuel cells and water electrolysis devices. Patent Document 1 discloses a DC bus control system using fuel cells and water electrolysis devices. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 103059

[0005] In a typical power control system, each device is connected to a single DC bus line via a DC / DC converter. Furthermore, in the case of fuel cells and water electrolysis devices, the voltage specifications are lower than those of power supply devices, so the DC bus line and each device must be connected via two DC / DC converters. Therefore, when electrically connecting a water electrolysis device and a fuel cell, a large power loss occurs. Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, one object of the present invention is to provide a power control system that can stabilize power while suppressing power loss. [Means for solving the problem]

[0007] According to one embodiment of the present invention, there is provided a power control system including: a power generation mechanism that uses renewable energy; a first DC bus line connected to the power generation mechanism and corresponding to a first voltage; a DC / DC conversion device connected to the first DC bus line and capable of converting the first voltage to a second voltage lower than the first voltage; a second DC bus line connected to the DC / DC conversion device and corresponding to the second voltage; a power generation fuel production device electrically connected to the second DC bus line and connected to the power generation device, for producing fuel to be used for power generation by the power generation device.

[0008] In the above power control system, the power generation mechanism may be a solar cell.

[0009] The above power control system may further include a power storage mechanism connected to the second DC bus line and configured to store the power generated by the power generation mechanism.

[0010] 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.

[0011] The above power control system may further include a control device that controls activation and deactivation of the power generation device and the power generation fuel generation device in accordance with a voltage value of the DC current on the first DC bus line.

[0012] The above power control system may include a first DC / AC conversion device connected to the first DC bus line, a second DC / AC conversion device connected to the second DC bus line, and a load connected to the first DC / AC conversion device and the second DC / AC conversion device, and when a voltage of the first DC bus line satisfies a predetermined condition, the control device may supply power from the second DC / AC conversion device to the load. [Effects of the Invention]

[0013] According to one embodiment of the present invention, it is possible to provide a power control system that can stabilize power while suppressing power loss. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an overall configuration diagram of a power control system according to an embodiment of the present invention; [Figure 2] FIG. 2 is a block diagram of a control device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a functional block diagram of a control unit according to an embodiment of the present invention. [Figure 4] 1 is a flowchart of a control method according to an embodiment of the invention. [Figure 5A] 1 is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention; [Figure 5B] 1 is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention; [Figure 5C] 1 is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention; [Figure 6A] 1 is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention; [Figure 6B] 1 is a schematic diagram showing the relationship between time and power in a power control system according to an embodiment of the present invention; [Figure 7] 1 is a schematic diagram showing the flow of power in a power control system according to an embodiment of the present invention; [Figure 8] 1 is an overall configuration diagram of a power control system according to an embodiment of the present invention; [Figure 9] 1 is an overall configuration diagram of a power control system according to an embodiment of the present invention; [Figure 10] 1 is a flowchart of a control method according to an embodiment of the invention. [Figure 11] FIG. 1 is an overall configuration diagram of a conventional power control system. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, each embodiment of the invention disclosed in this application will be described with reference to the drawings. However, the present invention can be embodied in various forms without departing from the spirit of the invention, and should not be construed as being limited to the description of the embodiments exemplified below.

[0016] In the drawings referred to in this embodiment, identical parts or parts having similar functions are designated by the same or similar reference numerals (reference numerals simply consisting of a number followed by A, B, etc.). Furthermore, for the sake of convenience, the dimensional ratios in the drawings may differ from the actual ratios, and some components may be omitted from the drawings.

[0017] Furthermore, although voltage is used in the description in this specification, voltage can be replaced with power or current, power can be replaced with current or voltage, and current can be replaced with voltage or power.

[0018] First Embodiment (1-1. Configuration of Power Control System 1) Hereinafter, the power control system according to this embodiment will be described with reference to the drawings.

[0019] Fig. 1 is an overall configuration diagram of a power control system 1 according to this embodiment. As shown in Fig. 1, the power control system 1 includes a control device 10, a solar power generation unit 20, a storage battery unit 30, a water electrolysis unit 40, a fuel cell unit 50, a first DC bus line 100, a second DC bus line 200, a DC / DC converter 110, a DC / AC converter 120, and a load 90.

[0020] The photovoltaic power generation unit 20 , the storage battery unit 30 , the DC / DC converter 110 , and the DC / AC converter 120 are directly connected to the first DC bus line 100 .

[0021] The solar power generation unit 20 includes a solar cell 21 and a DC / DC converter 23. The solar cell 21 generates electric power by utilizing sunlight. The DC / DC converter 23 converts the voltage value of the DC current generated by the solar cell 21 so that it matches the voltage value of the DC current on the first DC bus line 100.

[0022] The storage battery unit 30 includes a storage battery 31 and a DC / DC converter 33. The storage battery 31 stores power generated by the power control system 1. The DC / DC converter 33 converts the voltage value of the DC current flowing through the first DC bus line 100 to conform to the voltage specification of the storage battery 31 in order to store surplus power in the power control system 1 in the storage battery 31.

[0023] The DC / DC converter 110 is connected to the first DC bus line 100 and the second DC bus line 200. The DC / DC converter 110 converts (steps down) the voltage value of the DC current flowing through the first DC bus line 100 so that it matches the voltage value of the DC current flowing through the second DC bus line 200. The DC / DC converter 110 also converts (steps up) the voltage value of the DC current flowing through the second DC bus line 200 so that it matches the voltage value of the DC current on the first DC bus line 100. The DC voltage value flowing through the first DC bus line 100 corresponds to a first voltage. The voltage value flowing through the second DC bus line 200 corresponds to a second voltage. The second voltage is lower than the first voltage. In this example, the first voltage is 400 V and the second voltage is 48 V.

[0024] The DC / AC converter 120 converts the direct current flowing through the first DC bus line 100 into alternating current. The load 90 represents each device that consumes power. For example, the load 90 includes various electrical devices such as a television, air conditioner, electric light, washing machine, refrigerator, and personal computer.

[0025] The water electrolysis unit 40 and the fuel cell unit 50 are electrically connected to a second DC bus line 200 .

[0026] 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 DC current on the second DC bus line 200 so that it conforms to the specified voltage value of the water electrolysis device 41.

[0027] The fuel cell unit 50 includes a fuel cell 51 and a DC / DC converter 53. The fuel cell 51 generates power through an electrochemical reaction using hydrogen produced in the water electrolysis device 41 and stored in the hydrogen storage device 45. The DC / DC converter 53 converts the voltage value of the DC current produced in the fuel cell 51 so that it matches the voltage value of the DC current on the second DC bus line 200.

[0028] As described above, the water electrolysis device 41 and the fuel cell 51 are connected via the hydrogen storage device 45. This allows the fuel cell 51 to generate electricity using hydrogen supplied from the water electrolysis device 41. In other words, the water electrolysis device 41 can generate fuel for the fuel cell 51 to use in power generation, and therefore can be called a power generation fuel generating device.

[0029] (1-2. Control device) 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.

[0030] The control unit 101 controls the operation of each unit of the power control system 1. The control unit 101 includes, for example, a processor equipped with an arithmetic processing unit such as a CPU (Central Processing Unit) and memories such as a ROM (Read-On Memory) and a RAM (Random Access Memory). The control unit 101 monitors, for example, the operating state of each unit, the voltage value of the DC current on the first DC bus line 100, and the voltage value of the DC current on the second DC bus line 200, and controls each device. By monitoring the voltage value of the DC current on the first DC bus line 100 and the voltage value of the DC current on the second DC bus line 200, the control unit 101 can detect abnormalities in the voltage value of the first DC bus line 100 and the voltage value of the second DC bus line 200, respectively.

[0031] The storage unit 103 may be a memory, a semiconductor memory such as an SSD (Solid State Drive), a magnetic recording medium (magnetic tape, magnetic disk, etc.), an optical recording medium, a magneto-optical recording medium, or a storage element that can store data. The storage unit 103 has a function of storing a control program and various information used in the control program.

[0032] The display unit 105 displays the control information based on the control of the control unit 101. At this time, the display unit 105 may display the control information via a GUI (Graphical User Interface). Furthermore, when an abnormality is detected in the power control system 1, the display unit 105 may display abnormality information on the display unit. Note that the display unit 105 does not necessarily have to be provided depending on the aspect of the control device 10.

[0033] The communication unit 107 transmits and receives information to and from each device under the control of the control unit 101.

[0034] The control device 10 may also be provided with a notification unit that notifies of abnormalities, in addition to the control unit 101, storage unit 103, display unit 105, and communication unit 107. The notification unit may be a light or a buzzer.

[0035] Fig. 3 is a functional block diagram of the control unit 101. As shown in Fig. 3, the control unit 101 includes an acquisition unit 1011, a determination unit 1013, and a drive instruction unit 1015 as functional units.

[0036] The acquiring unit 1011 has a function of acquiring the voltage value of the DC current in the first DC bus line 100. The acquiring unit 1011 also has a function of acquiring the voltage value of the DC current in the second DC bus line 200.

[0037] The determining unit 1013 has a function of determining whether the voltage value of the direct current satisfies a predetermined condition (whether the voltage is higher than the reference voltage).

[0038] The drive instruction unit 1015 has a function of instructing the water electrolysis device 41 and the fuel cell 51 to drive or stop.

[0039] (1-3. Power control method) Next, the power control method will be described. Fig. 4 is a flowchart of the power control method. Figs. 5A to 5C and Figs. 6A to 6B are schematic diagrams showing the relationship between time and voltage in the power control system 1.

[0040] The control device 10 in Fig. 2 acquires the voltage value of the first DC bus line 100 (step S101). Fig. 5A is a schematic diagram showing the change in the voltage of the first DC bus line 100 over time, and is also a schematic diagram showing the relationship between time and the difference between the power from the photovoltaic power generation unit 20 in Fig. 1 and the power consumption by the load 90. As shown in Fig. 5A, the voltage of the first DC bus line 100 is constantly fluctuating. The control device 10 constantly acquires and monitors the voltage of the first DC bus line 100.

[0041] 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 line 100 is higher than the reference voltage V0. It is determined whether the voltage is high (step S103).

[0042] 5B is a schematic diagram showing the relationship between time and voltage fluctuations during operation of the fuel cell 51. As shown in FIG. 5B, when the fuel cell 51 is operated in the range from time T1 to time T2, the voltage increases by +ΔV from the reference voltage V0. In other words, when the fuel cell 51 is operated, the power control system 1 can be switched to increase the voltage of the first DC bus line 100 (supplement power).

[0043] 5C is a schematic diagram showing the relationship between time and voltage fluctuations during operation of the water electrolysis device 41. As shown in Fig. 5C, when the water electrolysis device 41 is operated in the range from time T3 to time T4, the voltage drops by -ΔV from the reference voltage V0. In other words, when the water electrolysis device 41 is operated, the power control system 1 can be switched to a direction in which the voltage of the first DC bus line 100 is reduced (power is consumed).

[0044] 6A and 6B are schematic diagrams that combine the relationship between the voltage of the first DC bus line 100 and time shown in FIG. 5A with the relationship between the drive of the fuel cell and the water electrolysis device and time shown in FIGS. 5B and 5C. In this embodiment, the control device 10 switches between drive and stop of the fuel cell 51 and the water electrolysis device 41 depending on the voltage of the first DC bus line 100. Specifically, when the voltage of the first DC bus line 100 is higher than the reference voltage V0 and there is a power surplus, the water electrolysis device 41 is driven to produce hydrogen. Conversely, when the voltage of the first DC bus line 100 is lower than the reference voltage V0 and there is a power shortage, the fuel cell 51 is driven to replenish the power.

[0045] Attention is now focused on the time when the voltage of the first DC bus line 100 in FIG. 6A switches from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0. The area in FIG. 6A where the voltage of the first DC bus line 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 area is enlarged and illustrated in FIG. 6B. In FIG. 6B, when the voltage of the first DC bus line 100 switches from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0, there is a period during which the operation to turn off the water electrolysis device 41, which was operating when the voltage of the first DC bus line 100 was high, overlaps with the operation to turn on the fuel cell 51, which will now be operating as the voltage drops below the reference voltage V0. In other words, when the voltage is switched as shown in FIG. 6B, the aim is to always maintain the voltage of the first DC bus line 100 at the reference voltage V0, so the fuel cell 51 and the water electrolysis device 41 may be operating simultaneously for a certain period of time. Specifically, when the voltage of the first DC bus line 100 switches from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0 (step S103; No), the control device 10 transmits a signal to the water electrolysis device 41 and the fuel cell 51 to instruct them to stop the water electrolysis device 41 and to start the fuel cell 51 (step S107). At this time, if the electrochemical reaction inside the water electrolysis device 41 and the fuel cell 51 is suddenly changed, they may be damaged or their lifespan may be shortened. For this reason, it is desirable for the control device 10 to gradually change the voltage when starting or stopping the water electrolysis device and the fuel cell, and therefore there is a period during which the water electrolysis device 41 and the fuel cell 51 are operating simultaneously.

[0046] Furthermore, when the voltage of the first DC bus line 100 switches 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 signals to the water electrolysis device 41 and the fuel cell 51 to instruct them to stop the fuel cell 51 and to start the water electrolysis device 41 (step S105). In this case, as when the voltage of the first DC bus line 100 transitions from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0, a ​​sudden change in the electrochemical reaction inside the water electrolysis device 41 and the fuel cell 51 may result in damage or a shortened lifespan. For this reason, it is desirable for the control device 10 to gradually change the voltage when starting or stopping the water electrolysis device and the fuel cell, so there is a period when the water electrolysis device 41 and the fuel cell 51 are operating simultaneously.

[0047] After transmitting each instruction signal to the water electrolysis device 41 and the fuel cell 51 (steps S105 and S107), the control device 10 loops to a process of acquiring the voltage (voltage value) of the first DC bus line (step S101).

[0048] During this period when the water electrolysis device 41 and the fuel cell 51 are simultaneously operating, the power output from the fuel cell 51 is supplied to the first DC bus line 100 and also to the water electrolysis device 41 via the second DC bus line 200, as shown in Fig. 1. The situation at this time is shown in Fig. 7.

[0049] Here, a comparison is made between a conventional power control system and the power control system according to this embodiment. FIG. 11 is a configuration diagram of a conventional power control system 500. The conventional power control system does not include the second DC bus line 200 as shown in FIG. 1 of the present application. The specified voltage values ​​of the water electrolysis device and fuel cell may be approximately 20 times or more lower than the voltage value of the DC current flowing through the first DC bus line 100. In such cases, it is difficult to perform voltage conversion using a single DC / DC converter. Therefore, in the conventional power control system, as shown in FIG. 11, two converters, a DC / DC converter 110 and a DC / DC converter 43, are arranged between the first DC bus line 100 and the water electrolysis device 41. Similarly, two converters, a DC / DC converter 111 and a DC / DC converter 53, are arranged between the first DC bus line 100 and the fuel cell 51.

[0050] Therefore, during the period when the water electrolysis device 41 and the fuel cell 51 are operating 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, and 43). At this time, power loss occurs when each converter converts voltage. As a result, in conventional power control systems, power goes through four DC / DC converters, and the DC / DC converters convert voltage four times, resulting in significant power loss.

[0051] However, in the present embodiment, as shown in Fig. 7 , the water electrolysis unit 40 and the fuel cell unit 50 are connected in parallel to the second DC bus line 200. When the water electrolysis device 41 and the fuel cell 51 are driven simultaneously, the power from the fuel cell flows to the water electrolysis device via the second DC bus line 200, not via the first DC bus line 100. This reduces the number of times voltage is converted by the DC / DC converter to two, thereby reducing power loss. In other words, by using this embodiment, power stabilization can be achieved while reducing power loss.

[0052] Second Embodiment In this embodiment, a power control system different from that in Embodiment 1 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 line will be described.

[0053] (2-1. Configuration of power control system 1A) Fig. 8 is an overall configuration diagram of a power control system 1A according to this embodiment. As shown in Fig. 8, the power control system 1A may include a control device 10, a solar power generation unit 20, a storage battery unit 30, a water electrolysis unit 40, a fuel cell unit 50, a first DC bus line 100, a second DC bus line 200, a DC / DC converter 110, a DC / AC converter 120, and a load 90, as well as a storage battery unit 60 and a capacitor unit 70.

[0054] In this embodiment, in addition to the water electrolysis unit 40 and the fuel cell unit 50, a storage battery unit 60 and a capacitor unit 70 are connected to the second DC bus line 200.

[0055] The storage battery unit 60 includes a storage battery 61 and a DC / DC converter 63. The storage battery 61 stores power generated in the power control system 1A. The DC / DC converter 63 converts the voltage value of the DC current flowing through the second DC bus line 200 to conform to the specified voltage of the storage battery 61 in order to store surplus power in the power control system 1A in the storage battery 61.

[0056] The capacitor unit 70 includes a capacitor 71 and a DC / DC converter 73. The capacitor 71 stores the power generated in the power control system 1A. The DC / DC converter 73 converts the voltage value of the DC current flowing through the second DC bus line 200 to conform to the specified voltage of the capacitor 71 in order to store surplus power in the power control system 1A in the capacitor 71.

[0057] As described above, the power control system 1A includes a power storage mechanism for storing power, such as a storage battery 61 or a capacitor 71, connected to the second DC bus line 200. This allows the power generated by the fuel cell 51 to be stored in the storage battery 61 or the capacitor 71, reducing the number of times voltage is converted compared to when the power is stored in the storage battery 31. Therefore, by using this embodiment, power loss can be suppressed and power stabilization can be achieved.

[0058] In this embodiment, in addition to the storage battery unit 60 and the capacitor unit 70, other electrical devices may be directly connected to the second DC bus line 200.

[0059] <Third embodiment> In this embodiment, a power control system different from that in the second embodiment will be described. Specifically, a DC / AC converter is connected to the second DC bus line 200, and a method of supplying power to a load will be described.

[0060] (3-1. Configuration of power control system 1B) Fig. 9 is an overall configuration diagram of a power control system 1B according to this embodiment. As shown in Fig. 9, the power control system 1B may include a DC / AC converter 210 in addition to a control device 10, a solar power generation unit 20, a storage battery unit 30, a water electrolysis unit 40, a fuel cell unit 50, a first DC bus line 100, a second DC bus line 200, a DC / DC converter 110, a DC / AC converter 120, a load 90, a storage battery unit 60, and a capacitor unit 70.

[0061] In this embodiment, in addition to the water electrolysis unit 40, the fuel cell unit 50, the storage battery unit 60, and the capacitor unit 70, a DC / AC converter 210 may be connected to the second DC bus line 200.

[0062] The DC / AC converter 210 converts the DC current flowing through the second DC bus line 200 into an AC current and supplies the AC current to the load 90 .

[0063] (3-2. Power control method) Next, the power control method will be described with reference to the flowchart of FIG.

[0064] The control device 10 acquires the voltage value of the first DC bus line 100 (step S201). The control device 10 constantly acquires and monitors the voltage value (power value).

[0065] Next, the control device 10 determines whether the voltage value of the first DC bus line satisfies a predetermined condition (step S203). Specifically, the control device 10 determines whether an abnormality exists in the power control system 1B. The abnormality in this case may be a momentary low voltage or an emergency such as a power outage.

[0066] In a normal state, that is, when no abnormality is detected (step S203; No), the control device 10 instructs the supply of power to the load 90 via the DC / AC converter 120 (also referred to as the first DC / AC converter) (step S205).

[0067] If an abnormality is detected (step S203; Yes), the control device 10 instructs the supply of power to the load 90 via the DC / AC converter 210 (also referred to as the second DC / AC converter) (step S207).

[0068] By using this embodiment, when an abnormality is detected in the power control system, the second DC bus line can be used as an emergency power source, and a stable supply of power can be achieved in an emergency.

[0069] (Variation) Within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications and alterations, and it is understood that these modifications and alterations also fall within the scope of the present invention. For example, to the above-described embodiments, a person skilled in the art may appropriately add, delete, or modify components, or add, omit, or change conditions of processing, and these modifications are also included within the scope of the present invention as long as they include the gist of the present invention.

[0070] In the first embodiment of the present invention, an example has been shown in which the power control system includes a solar power generation unit, but the present invention is not limited to this. For example, instead of a solar power generation unit, a unit having a power generation mechanism that uses wind power generation, geothermal power generation, biomass power generation, hydroelectric power generation, temperature difference power generation, or other renewable energy may be used, or these power generation mechanisms may be used in appropriate combination.

[0071] In the first embodiment of the present invention, an example was shown in which a fuel cell was used as the power generation device and a water electrolysis device was used as the 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 be used as the power generation device.

[0072] In the first embodiment of the present invention, an example has been shown in which a single reference voltage (V0) is used for 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. Separate reference voltages may 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 start-up and shutdowns due to minor voltage fluctuations can be reduced. [Explanation of symbols]

[0073] 1 Power control system, 10 Control device, 20 Photovoltaic 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 line, 101, control unit, 103, storage unit, 105, display unit, 107, communication unit, 110, DC / DC converter, 120, DC / AC converter, 200, second DC bus line, 210, DC / AC converter, 1011, acquisition unit, 1013, determination unit, 1015, drive instruction unit

Claims

1. A power generation mechanism using renewable energy, a first DC bus line connected to the power generation mechanism and corresponding to a first voltage; a DC / DC converter connected to the first DC bus line and capable of converting the first voltage into a second voltage lower than the first voltage; a second DC bus line connected to the DC / DC converter and corresponding to the second voltage; a power generation device electrically connected to the second DC bus line; a power generation fuel generating device electrically connected to the second DC bus line and connected to the power generation device, the power generation fuel generating device generating fuel for use in power generation by the power generation device; a control device that controls activation and deactivation of the power generation device and the power generation fuel production device in accordance with a voltage value of the DC current on the first DC bus line, Power control system.

2. the power generation mechanism is a solar cell; The power control system of claim 1 .

3. a power storage mechanism connected to the second DC bus line and configured to store the electric power generated by the power generation mechanism; The power control system of claim 1 .

4. the power generation device is a fuel cell, The power generation fuel generating device is a water electrolysis device. The power control system of claim 1 .

5. a first DC / AC conversion device connected to the first DC bus line; a second DC / AC conversion device connected to the second DC bus line; a load connected to the first DC / AC conversion device and the second DC / AC conversion device; When the voltage of the first DC bus line satisfies a predetermined condition, the control device supplies power to the load via the second DC / AC conversion device. The power control system of claim 1 .

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