Power control method

Abstract

This system provides a power control system that stabilizes power supply while minimizing power loss. [Solution] The power control system 1 includes a photovoltaic power generation unit 20 and a battery unit 30 directly connected to a first DC bus line 100, a DC / DC converter 110 that steps down the voltage value of the DC current flowing through the first DC bus line to match the voltage value of the DC current flowing through the second DC bus line 200, and a water electrolysis unit 40 and a fuel cell unit 50 electrically connected to the second DC bus line 200. The water electrolysis unit includes a water electrolysis device 41, which generates hydrogen using the electrolysis of water and stores the generated hydrogen in a hydrogen storage device 45, and the fuel cell unit includes a fuel cell 51, which generates electricity by an electrochemical reaction using the hydrogen stored in the hydrogen storage device.

Description

Technical Field

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

Background Art

[0002] In recent years, efforts towards Sustainable Development Goals (SDGs) have been expanding. Moreover, power control systems that utilize renewable energy such as sunlight, wind power, and geothermal energy have attracted attention, replacing 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 generated power fluctuates significantly depending on weather, season, location, etc. Also, the power consumption of the consuming side (loads) such as houses and stores changes. Therefore, an excess or shortage of power occurs according to the power supply-demand balance between generation and consumption. Thus, recently, efforts have been underway to stabilize power using fuel cells and water electrolysis devices. Patent Document 1 discloses a DC bus control system using a fuel cell and a water electrolysis device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] In the case of a normal power control system, each device is connected to a single DC bus line via a DC / DC converter. Also, 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 line and each device via two DC / DC converters. Therefore, when connecting a water electrolysis device and a fuel cell electrically, a large power loss occurs.

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, one of the objectives 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, a power control system is provided, which includes 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 to 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; and a power generation fuel generation device electrically connected to the second DC bus line and also connected to the power generation device, which generates fuel for use in power generation for the power generation device.

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

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

[0010] In the above-described 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 include a control device that controls the driving and stopping of the power generator and the power generation fuel generator according to the voltage value of the DC current in the first DC bus line.

[0012] In the power control system described above, the system includes a first DC / AC converter connected to the first DC bus line, a second DC / AC converter connected to the second DC bus line, and a load connected to the first DC / AC converter and the second DC / AC converter. When the voltage of the first DC bus line satisfies predetermined conditions, the control device may supply power from the second DC / AC converter to the load. [Effects of the Invention]

[0013] According to one embodiment of the present invention, a power control system can be provided that can stabilize power while suppressing power loss. [Brief explanation of the drawing]

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

Embodiments for Implementing 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 implemented in various forms without departing from the gist thereof, and is not to be construed as being limited to the description content of the embodiments illustrated below.

[0016] In the drawings referred to in this embodiment, the same parts or parts having the same function are denoted by the same reference numerals or similar reference numerals (reference numerals with A, B, etc. appended after the numbers). Also, the dimensional ratios in the drawings may be different from the actual ratios for convenience of explanation, and a part of the configuration may be omitted from the drawings.

[0017] Also, 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 while referring to the drawings.

[0019] Figure 1 is an overall configuration diagram of the power control system 1 in this embodiment. As shown in Figure 1, the power control system 1 includes a control device 10, a photovoltaic power generation unit 20, a battery storage 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, and a DC / AC converter 120, and a load 90.

[0020] The solar power generation unit 20, the battery storage 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 electricity using sunlight. The DC / DC converter 23 converts the voltage value of the DC current generated by the solar cell 21 to match the voltage value of the DC current in the first DC bus line 100.

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

[0024] The DC / AC converter 120 converts the DC current flowing through the first DC bus line 100 into AC current. The load 90 represents various devices that consume power. For example, the load 90 may include various electrical devices such as televisions, air conditioners, lights, washing machines, refrigerators, and personal computers.

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

[0026] The water electrolysis unit 40 includes a water electrolyzer 41 and a DC / DC converter 43. The water electrolyzer 41 generates hydrogen using the electrolysis of water. The generated hydrogen is stored in a hydrogen reservoir 45. The DC / DC converter 43 converts the voltage value of the DC current in the second DC bus line 200 to match the specified voltage value of the water electrolyzer 41.

[0027] The fuel cell unit 50 includes a fuel cell 51 and a DC / DC converter 53. The fuel cell 51 generates electricity by an electrochemical reaction using hydrogen produced in the water electrolyzer 41 and stored in the hydrogen reservoir 45. The DC / DC converter 53 converts the voltage value of the DC current produced in the fuel cell 51 to match the voltage value of the DC current in the second DC bus line 200.

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

[0029] (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.

[0030] The control unit 101 controls the operation of each part of the power control system 1. The control unit 101 includes a processor equipped with, for example, a arithmetic processing unit exemplified by a CPU (Central Processing Unit), and memory exemplified by ROM (Read On Memory) and RAM (Random Access Memory). The control unit 101 monitors, for example, the operation status of each unit, the voltage value of the DC current in the first DC bus line 100, and the voltage value of the DC current in the second DC bus line 200, and controls each device. By monitoring the voltage value of the DC current in the first DC bus line 100 and the voltage value of the DC current in the second DC bus line 200, the control unit 101 can detect abnormalities in the voltage values ​​of the first DC bus line 100 and the second DC bus line 200, respectively.

[0031] The storage unit 103 can use memory, solid state drive (SSD) semiconductor memory, magnetic recording media (magnetic tape, magnetic disk, etc.), optical recording media, magneto-optical recording media, and storage-capable elements that serve as storage media. The storage unit 103 has the function of storing control programs and various types of information used in the control programs.

[0032] The display unit 105 displays control information based on the control unit 101. In this case, the display unit 105 may display the control information via a GUI (Graphical User Interface). In addition, if an abnormality is detected in the power control system 1, the display unit 105 may display abnormality information. Note that the display unit 105 is not necessarily provided depending on the configuration of the control device 10.

[0033] The communication unit 107 transmits and receives information with each device based on the control of the control unit 101.

[0034] Furthermore, in addition to the control unit 101, storage unit 103, display unit 105, and communication unit 107, the control device 10 may also be provided with a notification unit for notifying abnormalities. Lights and buzzers may be used in the notification unit.

[0035] Figure 3 is a functional block diagram of the control unit 101. As shown in Figure 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 acquisition unit 1011 has the function of acquiring the voltage value of the DC current in the first DC bus line 100. The acquisition unit 1011 also has the function of acquiring the voltage value of the DC current in the second DC bus line 200.

[0037] The determination unit 1013 has the function of determining whether the voltage value of the DC current satisfies a predetermined condition (whether or not it is a voltage higher than the reference voltage).

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

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

[0040] The control device 10 in Figure 2 acquires the voltage value of the first DC bus line 100 (step S101). Figure 5A is a schematic diagram showing the time variation of the voltage of the first DC bus line 100, and is also a schematic diagram showing the relationship between the difference between the power from the solar power generation unit 20 in Figure 1 and the power consumption consumed by the load 90, and time. As shown in Figure 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 predetermined conditions. Specifically, the control device 10 determines whether the acquired voltage of the first DC bus line 100 is higher than the reference voltage Vo (step S103).

[0042] Figure 5B is a schematic diagram showing the relationship between voltage fluctuations and time during the operation of the fuel cell 51. As shown in Figure 5B, the voltage increases by +ΔV from the reference voltage V0 as the fuel cell 51 is operated from time T1 to time T2. In other words, the operation of the fuel cell 51 allows the power control system 1 to switch to a direction that increases the voltage of the first DC bus line 100 (replenishes power).

[0043] Figure 5C is a schematic diagram showing the relationship between voltage fluctuations and time during the operation of the water electrolysis device 41. As shown in Figure 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 switch to a direction that reduces the voltage of the first DC bus line 100 (consumes power).

[0044] Figures 6A and 6B are schematic diagrams that combine the relationship between the voltage of the first DC bus line 100 and time shown in Figure 5A with the relationship between the operation of the fuel cell and water electrolyzer and time shown in Figures 5B and 5C. In this embodiment, the control device 10 switches the operation of the fuel cell 51 and the water electrolyzer 41 on and off according to the voltage of the first DC bus line 100. Specifically, if the voltage of the first DC bus line 100 is higher than the reference voltage V0 and there is a surplus of power, the water electrolyzer 41 is driven to produce hydrogen. Conversely, if 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] At this point, we focus on the moment when the voltage of the first DC bus line 100 in Figure 6A switches from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0. In Figure 6(A), the portion 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 shown in Figure 6(B). In Figure 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 when the operation of turning off the water electrolysis device 41, which was driven when the voltage of the first DC bus line 100 was at a high voltage, and the operation of turning on the fuel cell 51, which will be driven from now on, overlap. In other words, as shown in Figure 6B, when switching voltages, the goal 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 driven 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 sends a signal to the water electrolyzer 41 and the fuel cell 51 to instruct them to stop and start (step S107). At this time, in the case of the water electrolyzer 41 and the fuel cell 51, abrupt changes in the internal electrochemical reactions may cause damage or a reduction in lifespan. For this reason, it is desirable for the control device 10 to change the voltage gradually when starting or stopping the water electrolyzer and the fuel cell, so there is a period when the water electrolyzer 41 and the fuel cell 51 are running 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, and the voltage of the first DC bus line 100 becomes higher than the reference voltage V0 (step S103; Yes), the control device 10 sends a signal to the water electrolyzer 41 and the fuel cell 51 to instruct them to stop the fuel cell 51 and to start the water electrolyzer 41 (step S105). In this case as well, as when the voltage of the first DC bus line 100 changes from a voltage higher than the reference voltage V0 to a voltage lower than the reference voltage V0, abrupt changes in the electrochemical reactions inside the water electrolyzer 41 and the fuel cell 51 may cause damage or a reduction in their lifespan. For this reason, it is desirable for the control device 10 to change the voltage gradually when starting or stopping the water electrolyzer and the fuel cell, so there is a period when the water electrolyzer 41 and the fuel cell 51 are running simultaneously.

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

[0048] During the period when the water electrolyzer 41 and the fuel cell 51 are operating simultaneously, as shown in Figure 1, the power output from the fuel cell 51 is supplied to the first DC bus line 100 and simultaneously to the water electrolyzer 41 via the second DC bus line 200. This situation is shown in Figure 7.

[0049] Here, we compare a conventional power control system with the power control system according to this embodiment. Figure 11 is a configuration diagram of a conventional power control system 500. Conventional power control systems do not have a second DC bus line 200 as shown in Figure 1 of this application. The specified voltage values ​​in the water electrolyzer 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 this case, it is difficult to perform voltage conversion with a single DC / DC converter, so in the conventional power control system, as shown in Figure 11, two converters, DC / DC converter 110 and DC / DC converter 43, are arranged between the first DC bus line 100 and the water electrolyzer 41. Similarly, two converters, DC / DC converter 111 and 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 electrolyzer 41 and the fuel cell 51 are operating simultaneously, power is supplied from the fuel cell 51 to the water electrolyzer 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, the voltage is converted four times by the DC / DC converters because the power passes through four DC / DC converters, resulting in significant power loss.

[0051] However, in this embodiment, as shown in Figure 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 without passing through the first DC bus line 100. This reduces the number of voltage conversions by the DC / DC converter to two, and as a result, power loss can be suppressed. In other words, by using this embodiment, power stabilization can be achieved while suppressing power loss.

[0052] <Second Embodiment> This embodiment describes a power control system different from that of the first embodiment. Specifically, an example is described in which devices other than the water electrolyzer 41 and fuel cell 51 are connected to the second DC bus line.

[0053] (2-1. Configuration of Power Control System 1A) Figure 8 is an overall configuration diagram of the power control system 1A in this embodiment. As shown in Figure 8, the power control system 1A may include a control device 10, a photovoltaic power generation unit 20, a battery storage 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 battery storage 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 battery unit 60 and a capacitor unit 70 are connected to the second DC bus line 200.

[0055] The battery unit 60 includes a battery 61 and a DC / DC converter 63. The battery 61 stores the power generated by 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 match the specified voltage of the battery 61 in order to store the surplus power from the power control system 1A in the battery 61.

[0056] 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 DC current flowing through the second DC bus line 200 to match the specified voltage of the capacitor 71 in order to store the surplus power from the power control system 1A in the capacitor 71.

[0057] As described above, the power control system 1A is equipped with an energy storage mechanism, such as a battery 61 or a capacitor 71, which is connected to the second DC bus line 200. This allows the power generated by the fuel cell 51 to be stored in the battery 61 or capacitor 71, reducing the number of voltage conversions compared to when the power is stored in the battery 31. Therefore, by using this embodiment, power stabilization can be achieved while suppressing power loss.

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

[0059] <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 line 200, and a method for supplying power to the load will be described.

[0060] (3-1. Configuration of Power Control System 1B) Figure 9 is an overall configuration diagram of the power control system 1B in this embodiment. As shown in Figure 9, the power control system 1B may include a control device 10, a photovoltaic power generation unit 20, a battery storage 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, and a DC / AC converter 120, a load 90, a battery storage unit 60, and a capacitor unit 70, in addition to a DC / AC converter 210.

[0061] In this embodiment, in addition to the water electrolysis unit 40, fuel cell unit 50, battery unit 60, and capacitor unit 70, a DC / AC converter 210 may also 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 AC current and supplies the AC current to the load 90.

[0063] (3-2. Power Control Methods) Next, we will explain the power control method. Figure 10 is a flowchart of the power control method.

[0064] The control device 10 acquires the voltage value of the first DC bus line 100 (step S201). The control device 10 continuously 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 meets predetermined conditions (step S203). Specifically, it determines whether there is an abnormality in the power control system 1B. Examples of abnormalities in this case include momentary low voltage or emergencies such as power outages.

[0066] Under normal conditions, i.e., when no abnormality is detected (step S203; No), the control device 10 instructs the power supply to the load 90 via the DC / AC converter 120 (also called 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 known as the second DC / AC converter) (step S207).

[0068] By using this embodiment, in a power control system, if an abnormality is detected, the second DC bus line can be used as an emergency power source, enabling a stable power supply during emergencies.

[0069] (modified version) Within the scope of the spirit of the present invention, a person skilled in the art can conceive of various modifications and alterations, and it is understood that such modifications and alterations also fall within the scope of the present invention. For example, any addition, deletion, or design change of components, or addition, omission, or modification of processing conditions, made by a person skilled in the art to the above-described embodiments, are also included within the scope of the present invention, as long as they retain the gist of the present invention.

[0070] In the first embodiment of the present invention, an example was shown in which the power control system includes a photovoltaic power generation unit, but the present invention is not limited thereto. For example, instead of a photovoltaic power generation unit, a unit having a power generation mechanism using wind power, geothermal power, biomass power, hydroelectric power, thermoelectric power, or other renewable energy may be used, or these power generation mechanisms may be used in appropriate combinations.

[0071] In the first embodiment of the present invention, an example was shown in which a fuel cell is used as the power generation device and a water electrolysis device is used as the power generation fuel production device, but the present invention is not limited thereto. 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 was shown in which a single reference voltage (V0) is used in the power generation device (fuel cell) and the power generation fuel production device (water electrolysis device), but the present invention is not limited thereto. Different reference voltages may be set in the power generation device (fuel cell) and the power generation fuel production device (water electrolysis device). In this case, the number of unnecessary starts and stops due to minor voltage fluctuations can be reduced. [Explanation of Symbols]

[0073] 1... Power control system, 10... Control device, 20... Solar power generation unit, 21... Solar cell, 23... DC / DC converter, 30... Battery storage unit, 31... Battery, 33... DC / DC converter, 40... Water electrolysis unit, 41... Water electrolysis device, 43... DC / DC converter, 45... Hydrogen storage unit, 50... Fuel cell unit, 51... Fuel cell, 53... DC / DC converter, 60... Battery storage 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...Memory 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

[Claim 1] A power generation mechanism using renewable energy, A first DC bus line, which is connected to the aforementioned power generation mechanism and corresponds to the first voltage, A DC / DC converter 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 is connected to the DC / DC converter and corresponds to the second voltage, A power generation device electrically connected to the second DC bus line, The system includes a power generation fuel generator that is electrically connected to the second DC bus line and also connected to the power generation device, and which generates fuel for use in power generation for the power generation device, Power control system.

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