Power supply system

Abstract

Provided is a power supply system capable of efficiently supplying power to a load using a plurality of power sources. The power supply system supplies power to an external load and comprises: a hydrogen supply unit including a hydrogen generating device that generates hydrogen by electrolysis; a hydrogen storage unit including a first storage device and a second storage device that store hydrogen obtained from the hydrogen supply unit; a fuel cell unit including a fuel cell that generates power based on hydrogen supplied from the hydrogen storage unit; a power storage unit including a first power storage device and a second power storage device that store power obtained from the fuel cell; and a control unit. The control unit switches the supply source of hydrogen to the fuel cell to the first storage device, the second storage device, and both the first storage device and the second storage device. Power is supplied to the load from any one of the first power storage device, the second power storage device, and both the first power storage device and the second power storage device.

Description

Technical Field

[0001] The present invention relates to a power supply system and the like. Background Art

[0002] Conventionally, as in Patent Document 1, a charging and discharging device for an electric vehicle has been proposed that stores electric power and supplies the stored electric power to an electric vehicle or the like.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-208132 Summary of the invention

[0006] However, the charge and discharge control of a plurality of power storage devices is not considered.

[0007] Therefore, an object of the present invention is to provide a power supply system or the like capable of efficiently supplying power to a load using a plurality of power sources.

[0008] The power supply system involved in the present invention supplies power to an external load, wherein the power supply system comprises: a hydrogen supply unit, which includes a hydrogen generating device that generates hydrogen by electrolysis; a hydrogen storage unit, which includes a first storage device and a second storage device, which store hydrogen obtained from the hydrogen supply unit; a fuel cell unit, which includes a first fuel cell and a second fuel cell, which generate electricity based on the hydrogen supplied from the hydrogen storage unit; a power storage unit, which includes a first power storage device that stores power obtained from the first fuel cell, and a second power storage device that stores power obtained from the second fuel cell; and a control unit.

[0009] The control unit switches and controls the supply source of hydrogen to the first fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device.

[0010] The control unit switches and controls the supply source of hydrogen to the second fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device.

[0011] Electric power is supplied to the load from the first power storage device, the second power storage device, or from one of the first power storage device and the second power storage device.

[0012] The hydrogen can be filled by one of the plurality of hydrogen storage devices (for example, the first storage device), and hydrogen can be supplied to the fuel cell by another hydrogen storage device (for example, the second storage device).

[0013] Furthermore, one of the plurality of fuel cells (for example, the first fuel cell) can be put to rest, and the other fuel cell can supply electric power to the power storage device (for example, the second fuel cell).

[0014] Furthermore, electric power can be supplied to an external load using a power storage device that is not being charged (for example, the first power storage device).

[0015] Therefore, filling and releasing of hydrogen can be performed safely.

[0016] In addition, the burden on the fuel cell and the power storage device can be reduced, making them less likely to deteriorate.

[0017] Preferably, when the first power storage device supplies electric power to the load, the control unit stops supplying hydrogen to the first fuel cell and enables supply of hydrogen to the second fuel cell.

[0018] When the second power storage device supplies electric power to the load, the control unit stops supplying hydrogen to the second fuel cell and enables supply of hydrogen to the first fuel cell.

[0019] When electric power is supplied from the first power storage device and the second power storage device to the load, the control unit stops supplying hydrogen to the first fuel cell and the second fuel cell.

[0020] Furthermore, preferably, the fuel cell unit includes a third fuel cell that generates electric power based on hydrogen supplied from the hydrogen storage unit.

[0021] The power storage unit includes a third power storage device that stores electric power obtained by the third fuel cell.

[0022] The control unit controls switching of the supply source of hydrogen to the first fuel cell to the first storage device, the second storage device, the third storage device, and at least two of the first storage device, the second storage device, and the third storage device.

[0023] The control unit controls switching of the supply source of hydrogen to the second fuel cell to the first storage device, the second storage device, the third storage device, and at least two of the first storage device, the second storage device, and the third storage device.

[0024] In addition, preferably, when hydrogen is supplied from the first storage device to at least one of the first fuel cell, the second fuel cell and the third fuel cell, the control unit stops supplying hydrogen from the hydrogen generating device to the first storage device, and creates a state in which hydrogen can be supplied from the hydrogen generating device to the second storage device.

[0025] When hydrogen is supplied from the second storage device to at least one of the first fuel cell, the second fuel cell and the third fuel cell, the control unit stops supplying hydrogen from the hydrogen generating device to the second storage device and creates a state in which hydrogen can be supplied from the hydrogen generating device to the first storage device.

[0026] Furthermore, preferably, the power supply system includes a first conversion unit including a first conversion device, a second conversion device, and a third conversion device.

[0027] The first conversion device converts the current form of the electric power from the first fuel cell from direct current to alternating current, and further from alternating current to direct current, and converts it to a predetermined voltage so as to be stored in the first power storage device.

[0028] The second conversion device converts the current form of the electric power from the second fuel cell from direct current to alternating current, and further from alternating current to direct current, and converts it to a predetermined voltage so as to be stored in the second power storage device.

[0029] The third conversion device converts the current form of the electric power from the third fuel cell from direct current to alternating current, and further from alternating current to direct current, and converts it to a predetermined voltage so as to be stored in the third power storage device.

[0030] Compared with a method of supplying electric power to the power storage device without converting the electric power into alternating current, it is possible to easily adjust the voltage to a voltage suitable for charging the power storage device.

[0031] In addition, preferably, the power supply system comprises: a power generation unit, which includes at least one power generation unit including a first power generation unit that generates DC power based on natural energy and a second power generation unit that generates AC power based on natural energy; a compression unit that compresses hydrogen obtained by a hydrogen generation device; and a power generation unit that generates power based on natural energy without converting it into electricity.

[0032] The hydrogen generator performs electrolysis based on the electric power from the power generation unit.

[0033] The compression unit is driven based on the power obtained from the power generation unit.

[0034] The power generated by the power generation unit is used to drive the compression unit. Therefore, a large amount of hydrogen can be generated by efficiently performing electrolysis using the power obtained by the power generation unit.

[0035] Furthermore, preferably, the hydrogen supply unit includes a pump that supplies the electrolyte to the hydrogen generator.

[0036] The pump and the compressor are driven based on the power obtained by the power generation part.

[0037] In addition, preferably, the power generation unit generates a rotational force as a power based on at least one of wind power and waves.

[0038] The compression unit is driven based on the rotational force obtained by the power generation unit.

[0039] Preferably, the power supply system includes a power generation unit including at least one of a first power generation device that generates DC power based on natural energy and a second power generation device that generates AC power based on natural energy.

[0040] The hydrogen generator performs electrolysis based on the electric power from the power generation unit.

[0041] The power supply system involved in the present invention supplies power to an external load, wherein the power supply system comprises: a hydrogen supply unit, which includes a hydrogen generation device that generates hydrogen by electrolysis; a hydrogen storage unit, which includes a first storage device and a second storage device, which store hydrogen obtained from the hydrogen supply unit; a fuel cell unit, which includes a fuel cell that generates electricity based on the hydrogen supplied from the hydrogen storage unit; a power storage unit, which includes a first power storage device and a second power storage device, which store power obtained from the fuel cell; and a control unit.

[0042] The control unit controls switching of the supply source of hydrogen to the fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device.

[0043] Electric power is supplied to the load from the first power storage device, the second power storage device, or from one of the first power storage device and the second power storage device.

[0044] The hydrogen can be filled by one of the plurality of hydrogen storage devices (for example, the first storage device), and hydrogen can be supplied to the fuel cell by another hydrogen storage device (for example, the second storage device).

[0045] Furthermore, electric power can be supplied to an external load using a power storage device that is not being charged (for example, the first power storage device).

[0046] Therefore, filling and releasing of hydrogen can be performed safely.

[0047] In addition, the burden on the power storage device can be reduced, making it less likely to deteriorate.

[0048] Effects of the Invention

[0049] As described above, according to the present invention, it is possible to provide a power supply system or the like that can efficiently supply power to a load using a plurality of power sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a configuration diagram of the power supply system according to the first embodiment.

[0051] Figure 2 It is a configuration diagram of a power supply system according to the second embodiment. DETAILED DESCRIPTION

[0052] Hereinafter, the first embodiment will be described with reference to the drawings.

[0053] In addition, the embodiments are not limited to the following embodiments. In addition, the content described in one embodiment can also be applied to other embodiments in principle. In addition, the embodiments and modifications can be appropriately combined.

[0054] (Power supply system 1)

[0055] The power supply system 1 of the first embodiment includes a power generation unit 10, a power generation unit 20, a hydrogen supply unit 30, a compression unit 40, a hydrogen storage unit 50, a fuel cell unit 60, a first conversion unit 70, a power storage unit 80, a second conversion unit 90, a first valve B1 to a seventh valve B7, and a first switch S1 to a third switch S3 (see Figure 1 ).

[0056] (Control Unit 3)

[0057] The control unit 3 controls each unit of the power supply system 1 .

[0058] In particular, the first valve B1 and the like are controlled based on the power generation state of the power generation unit 10 , the electrolyte filling state in the hydrogen generator 31 , the hydrogen filling state in the hydrogen storage unit 50 , the power storage state of the power storage unit 80 , the use state of the load 100 , and the like.

[0059] For example, the control unit 3 controls the switching of the hydrogen supply source to the first fuel cell 61 to the first storage device 51 , the second storage device 52 , the third storage device 53 , and at least two of the first storage device 51 , the second storage device 52 , and the third storage device 53 .

[0060] In addition, the control unit 3 controls the switching of the supply source of hydrogen to the second fuel cell 62 to the first storage device 51, the second storage device 52, the third storage device 53, and at least two of the first storage device 51, the second storage device 52 and the third storage device 53.

[0061] For example, when the first power storage device 81 supplies power to the load 100 , the control unit 3 stops supplying hydrogen to the first fuel cell 61 and enables supply of hydrogen to the second fuel cell 62 and the third fuel cell 63 .

[0062] When the second power storage device 82 supplies electric power to the load 100 , the control unit 3 stops supplying hydrogen to the second fuel cell 62 and sets the state in which hydrogen can be supplied to the first fuel cell 61 and the third fuel cell 63 .

[0063] When the third power storage device 83 supplies electric power to the load 100 , the control unit 3 stops supplying hydrogen to the third fuel cell 63 and sets the state in which hydrogen can be supplied to the first fuel cell 61 and the second fuel cell 62 .

[0064] When electric power is supplied from the first power storage device 81 , the second power storage device 82 , and the third power storage device 83 to the load 100 , the control unit 3 stops supplying hydrogen to the first fuel cell 61 , the second fuel cell 62 , and the third fuel cell 63 .

[0065] In addition, for example, when hydrogen is supplied from the first storage device 51 to at least one of the first fuel cell 61, the second fuel cell 62 and the third fuel cell 63, the control unit 3 stops supplying hydrogen from the hydrogen generating device 31 to the first storage device 51, and creates a state in which hydrogen can be supplied from the hydrogen generating device 31 to the second storage device 52.

[0066] When hydrogen is supplied from the second storage device 52 to at least one of the first fuel cell 61, the second fuel cell 62 and the third fuel cell 63, the control unit 3 stops supplying hydrogen from the hydrogen generating device 31 to the second storage device 52, and creates a state in which hydrogen can be supplied from the hydrogen generating device 31 to the first storage device 51.

[0067] The specific control contents will be described later.

[0068] (Power generation unit 10)

[0069] The power generation section 10 includes a first power generation device 11 and a second power generation device 12 .

[0070] The first power generation device 11 is a power generation device (power generation device derived from renewable energy) that generates DC power based on natural energy (renewable energy) such as a solar power generation device.

[0071] The first power generating device 11 is always in a state capable of generating power.

[0072] The electric power obtained by the first power generation device 11 is supplied to the hydrogen generator 31 .

[0073] The first power generating device 11 includes a backflow prevention device such as a diode.

[0074] The second power generation device 12 is a power generation device (power generation device derived from renewable energy) that generates AC power based on natural energy (renewable energy) such as a wind power generation device or a wave power generation device.

[0075] The second power generating device 12 is always in a state capable of generating power.

[0076] However, when the second power generator 12 is a wind power generator and the wind force received by the second power generator 12 exceeds a predetermined wind force, the second power generator 12 is in a state where it cannot generate power.

[0077] The electric power obtained by the second power generation device 12 is supplied to the hydrogen generator 31 .

[0078] The second power generation device 12 includes an AC / DC converter that converts the current form of the electric power generated by the second power generation device 12 from alternating current to direct current.

[0079] (Power Generation Unit 20)

[0080] The power generation unit 20 generates power such as rotational force based on natural energy without converting it into electric power.

[0081] For example, the power generation unit 20 is composed of a turbine or the like, and generates a rotational force as the power based on wind power, waves, geothermal heat, or the like.

[0082] The rotational force generated by the power generating unit 20 is transmitted to the pump 33, the first compression device 41, and the second compression device 42 (see Figure 1 dashed arrow).

[0083] (Hydrogen supply unit 30)

[0084] The hydrogen supply unit 30 includes a hydrogen generator 31 , a pump 33 , and an electrolyte storage unit 35 .

[0085] The hydrogen generator 31 generates hydrogen by electrolyzing an electrolyte such as water.

[0086] The hydrogen obtained by the hydrogen generator 31 is stored in the hydrogen storage unit 50 (the first storage device 51 and the second storage device 52 ) via the compressor 40 (the first compressor 41 and the second compressor 42 ).

[0087] The oxygen generated by electrolysis may be released into the atmosphere, or may be used in the fuel cell unit 60 described later.

[0088] The pump 33 draws the electrolyte from the electrolyte storage unit 35 and supplies the electrolyte to the hydrogen generator 31 .

[0089] Mechanical elements (such as the screw blade) included in the pump 33 are driven (rotated) based on the rotational force transmitted from the power generating unit 20 .

[0090] However, when the rotational force transmitted from the power generating unit 20 is insufficient, the pump 33 is driven based on the electric power supplied from the first power generating device 11 or the second power generating device 12. That is, the mechanical elements included in the pump 33 are also driven (rotated) by electric devices such as motors.

[0091] The electrolyte storage section 35 stores the electrolyte.

[0092] As the electrolyte, water such as tap water may be used, or water obtained by the reaction of hydrogen and oxygen in the fuel cell section 60 may be used.

[0093] (Compression section 40)

[0094] The compression unit 40 includes a first compression device 41 and a second compression device 42 .

[0095] In order to store hydrogen in the first storage device 51 , the first compression device 41 compresses the hydrogen obtained from the hydrogen generation device 31 .

[0096] The mechanical elements (turbine and the like) included in the first compression device 41 are driven (rotated) based on the rotational force transmitted from the power generating unit 20 .

[0097] However, when the rotational force transmitted from the power generating unit 20 is insufficient, the first compression device 41 is driven based on the power supplied from the first power generating device 11 or the second power generating device 12. That is, the mechanical elements included in the first compression device 41 are also driven (rotated) by electric devices such as motors.

[0098] The second compressor 42 compresses the hydrogen obtained from the hydrogen generator 31 in order to store the hydrogen in the second storage device 52 .

[0099] The mechanical elements (turbine and the like) included in the second compression device 42 are driven (rotated) based on the rotational force transmitted from the power generating section 20 .

[0100] However, when the rotational force transmitted from the power generating unit 20 is insufficient, the second compression device 42 is driven based on the power supplied from the first power generating device 11 or the second power generating device 12. That is, the mechanical elements included in the second compression device 42 are also driven (rotated) by electric devices such as motors.

[0101] (Hydrogen storage unit 50)

[0102] The hydrogen storage unit 50 includes a first storage device 51 and a second storage device 52 .

[0103] The first storage device 51 stores hydrogen in a compressed state.

[0104] The second storage device 52 stores hydrogen in a compressed state.

[0105] The hydrogen stored in the first storage device 51 and the hydrogen stored in the second storage device 52 are supplied to the fuel cell section 60 (the first fuel cell 61 , the second fuel cell 62 , and the third fuel cell 63 ).

[0106] (Fuel Cell Section 60)

[0107] The fuel cell section 60 includes a first fuel cell 61 , a second fuel cell 62 , and a third fuel cell 63 .

[0108] The first fuel cell 61 , the second fuel cell 62 , and the third fuel cell 63 are power generation devices (fuel cells) that generate power based on hydrogen supplied from at least one of the first storage device 51 and the second storage device 52 .

[0109] (First Converting Unit 70)

[0110] The first conversion unit 70 includes a first conversion device 71 , a second conversion device 72 , and a third conversion device 73 .

[0111] The first conversion device 71 has a DC / AC inverter and an AC / DC converter, and converts the current form of the power from the first fuel cell 61 from DC to AC and then from AC to DC, and converts the voltage to a specified value for storage in the first power storage device 81 .

[0112] The second conversion device 72 has a DC / AC inverter and an AC / DC converter, and converts the current form of the power from the second fuel cell 62 from DC to AC and then from AC to DC, and converts the voltage to a specified value for storage in the second power storage device 82 .

[0113] The third conversion device 73 has a DC / AC inverter and an AC / DC converter, and converts the current form of the power from the third fuel cell 63 from DC to AC and then from AC to DC, and converts the voltage to a specified value for storage in the third power storage device 83.

[0114] (Electricity Storage Unit 80)

[0115] The power storage unit 80 includes a first power storage device 81 , a second power storage device 82 , and a third power storage device 83 .

[0116] The first power storage device 81 , the second power storage device 82 , and the third power storage device 83 are arranged in parallel.

[0117] The first power storage device 81 includes a charging device and a power storage device for storing the electric power from the first fuel cell 61 .

[0118] The second power storage device 82 includes a charging device for storing the electric power from the second fuel cell 62 and a power storage device.

[0119] The third power storage device 83 includes a charging device and a power storage device for storing the electric power from the third fuel cell 63 .

[0120] (Second Converter 90)

[0121] The second conversion unit 90 includes a fourth conversion device 91 , a fifth conversion device 92 , and a sixth conversion device 93 .

[0122] The fourth conversion device 91 includes a DC / AC inverter, and converts the current form of the electric power from the first power storage device 81 from direct current to alternating current, and converts the voltage to a predetermined value (for example, three-phase 200 V) for driving the load 100 .

[0123] The fifth conversion device 92 includes a DC / AC inverter, and converts the current form of the electric power from the second power storage device 82 from direct current to alternating current, and converts the voltage to a predetermined value (for example, three-phase 200 V) for driving the load 100 .

[0124] The sixth conversion device 93 has a DC / AC inverter, and converts the current form of the electric power from the third power storage device 83 from direct current to alternating current, and converts the voltage into a predetermined value (for example, three-phase 200 V) for driving the load 100 .

[0125] (1st valve B1, 2nd valve B2)

[0126] The first valve B1 is provided between the hydrogen generating device 31 and the first compressing device 41 .

[0127] The first valve B1 controls the amount of hydrogen supplied from the hydrogen generating device 31 to the first compressing device 41 .

[0128] The second valve B2 is provided between the hydrogen generator 31 and the second compressor 42 .

[0129] The second valve B2 controls the amount of hydrogen supplied from the hydrogen generating device 31 to the second compressing device 42 .

[0130] (3rd valve B3, 4th valve B4)

[0131] The third valve B3 is provided between the first storage device 51 and the first to third fuel cells 61 to 63 , and is provided on the hydrogen discharge side of the first storage device 51 .

[0132] The third valve B3 controls the amount of hydrogen supplied from the first storage device 51 to at least one of the first to third fuel cells 61 to 63 .

[0133] The fourth valve B4 is provided between the second storage device 52 and the first to third fuel cells 61 to 63 , and is provided on the hydrogen discharge side of the second storage device 52 .

[0134] The fourth valve B4 controls the amount of hydrogen supplied from the second storage device 52 to at least one of the first to third fuel cells 61 to 63 .

[0135] (5th valve B5 to 7th valve B7)

[0136] The fifth valve B5 is provided between the first storage device 51 to the second storage device 52 and the first fuel cell 61 , and is provided on the hydrogen inlet side of the first fuel cell 61 .

[0137] The fifth valve B5 controls the amount of hydrogen supplied from at least one of the first storage device 51 and the second storage device 52 to the first fuel cell 61 .

[0138] The sixth valve B6 is provided between the first storage device 51 to the second storage device 52 and the second fuel cell 62 , and is provided on the hydrogen inlet side of the second fuel cell 62 .

[0139] The sixth valve B6 controls the amount of hydrogen supplied from at least one of the first storage device 51 and the second storage device 52 to the second fuel cell 62 .

[0140] The seventh valve B7 is provided between the first storage device 51 to the second storage device 52 and the third fuel cell 63 , and is provided on the hydrogen inlet side of the third fuel cell 63 .

[0141] The seventh valve B7 controls the amount of hydrogen supplied from at least one of the first storage device 51 and the second storage device 52 to the third fuel cell 63 .

[0142] (1st switch S1 to 3rd switch S3)

[0143] The first switch S1 is provided between the first power storage device 81 and the fourth conversion device 91 .

[0144] The first switch S1 performs on-off control of the power supply from the first power storage device 81 to the fourth conversion device 91 .

[0145] The second switch S2 is provided between the second power storage device 82 and the fifth conversion device 92 .

[0146] The second switch S2 performs on-off control of the power supply from the second power storage device 82 to the fifth conversion device 92 .

[0147] The third switch S3 is provided between the third power storage device 83 and the sixth conversion device 93 .

[0148] The third switch S3 performs on-off control of the power supply from the third power storage device 83 to the sixth conversion device 93 .

[0149] For example, when the third valve B3, the sixth valve B6, and the seventh valve B7 are in the open state, and the fourth valve B4 and the fifth valve B5 are in the closed state, hydrogen is supplied from the first storage device 51 to the second fuel cell 62 and the third fuel cell 63. Thus, power is supplied from the second fuel cell 62 to the second power storage device 82, and power is supplied from the third fuel cell 63 to the third power storage device 83.

[0150] At this time, the second switch S2 and the third switch S3 are in the open state, and the supply of electric power from the second power storage device 82 and the third power storage device 83 to the load 100 is stopped.

[0151] (Motion Control)

[0152] The operation control of the first valve B1 and the like by the control unit 3 will be described.

[0153] The power generation section 10 (the first power generation device 11 and the second power generation device 12 ) and the power generation section 20 are always driven.

[0154] However, the first power generation device 11 is a solar power generation device, and when light is not sufficiently supplied at night, the first power generation device 11 generates almost no electricity.

[0155] The second power generator 12 is a wind power generator, and when there is almost no wind, the second power generator 12 generates almost no electricity.

[0156] The power generation unit 20 generates a rotational force based on wind power, and when there is almost no wind, the power generation unit 20 generates almost no rotational force.

[0157] When the electric power P11 supplied from the first power generation device 11 and the second power generation device 12 is large and equal to or greater than the electric power threshold value Thp, hydrogen is generated.

[0158] (Control of Power Supply to Power Generation Unit 20)

[0159] When the rotation amount rv1 of the power generation unit 20 per unit time is large and reaches or exceeds the rotation amount threshold value Thrv, the control unit 3 supplies the electric power from the first power generation device 11 and the second power generation device 12 to the hydrogen generation device 31. In this case, the pump 33, the first compression device 41, and the second compression device 42 are driven based on the rotational force transmitted from the power generation unit 20.

[0160] When the rotation amount rv1 per unit time of the power generation unit 20 is less than the rotation amount threshold value Thrv, the control unit 3 supplies the electric power from the first power generation device 11 and the second power generation device 12 to the hydrogen generation device 31, the pump 33, the first compression device 41, and the second compression device 42. In this case, the pump 33, the first compression device 41, and the second compression device 42 are driven based on the electric power from the first power generation device 11 and the second power generation device 12.

[0161] (Control of Supplying Electrolyte to Hydrogen Generator 31)

[0162] When the remaining amount qv1 of the electrolyte in the hydrogen generator 31 is less than the remaining amount threshold Thqv, the control unit 3 operates the pump 33 so as to supply the electrolyte from the electrolyte storage unit 35 to the hydrogen generator 31 .

[0163] (Hydrogen Discharge Control of the First Storage Device 51 and the Second Storage Device 52)

[0164] When the hydrogen filling rate (first hydrogen filling rate rh1 ) in the first storage device 51 is less than the hydrogen filling rate threshold thrh, the controller 3 opens the first valve B1 to supply hydrogen from the hydrogen generator 31 via the first compressor 41 to the first storage device 51 .

[0165] When the hydrogen filling rate (second hydrogen filling rate rh2 ) in the second storage device 52 is less than the hydrogen filling rate threshold thrh, the control unit 3 opens the second valve B2 to supply hydrogen from the hydrogen generating device 31 via the second compressing device 42 to the second storage device 52 .

[0166] However, when the power P11 supplied from the first power generation device 11 and the second power generation device 12 is less than the power threshold Thp, hydrogen cannot be generated, so the control unit 3 closes the first valve B1 and the second valve B2.

[0167] (Charge and Discharge Control of First Power Storage Device 81)

[0168] When the charging rate (first charging rate R1) of the first power storage device 81 is less than the charging rate threshold value Thrc, and the first hydrogen filling rate rh1 is large and reaches or exceeds the hydrogen filling rate threshold value thrh, the control unit 3 sets the third valve B3 and the fifth valve B5 to the open state so that hydrogen is supplied from the first storage device 51 to the first fuel cell 61. In this case, the control unit 3 sets the first switch S1 to the open state so that power is not supplied from the first power storage device 81 to the load 100 via the fourth conversion device 91.

[0169] The first fuel cell 61 generates electricity based on hydrogen supplied from the first storage device 51 , and supplies the electricity to the first power storage device 81 via the first conversion device 71 .

[0170] When the first charging rate R1 is less than the charging rate threshold value Thrc, and the second hydrogen filling rate rh2 is large and reaches or exceeds the hydrogen filling rate threshold value thrh, the control unit 3 sets the fourth valve B4 and the fifth valve B5 to the open state so that hydrogen is supplied from the second storage device 52 to the first fuel cell 61. In this case, the control unit 3 sets the first switch S1 to the open state so that power is not supplied from the first power storage device 81 to the load 100 via the fourth conversion device 91.

[0171] The first fuel cell 61 generates electricity based on the hydrogen supplied from the second storage device 52 , and supplies the electricity to the first power storage device 81 via the first conversion device 71 .

[0172] When the first charging rate R1 is large and reaches or exceeds the charging rate threshold value Thrc, the control unit 3 turns on the first switch S1 so that power is supplied from the first power storage device 81 to the load 100 via the fourth conversion device 91. At this time, preferably, the fifth valve B5 is turned off so that power is not supplied from the first fuel cell 61 to the first power storage device 81 via the first conversion device 71.

[0173] (Charge and Discharge Control of Second Power Storage Device 82)

[0174] When the charging rate (second charging rate R2) of the second power storage device 82 is less than the charging rate threshold value Thrc, and the first hydrogen filling rate rh1 is large and reaches or exceeds the hydrogen filling rate threshold value thrh, the control unit 3 sets the third valve B3 and the sixth valve B6 to the open state so that hydrogen is supplied from the first storage device 51 to the second fuel cell 62. In this case, the control unit 3 sets the second switch S2 to the open state so that power is not supplied from the second power storage device 82 to the load 100 via the fifth conversion device 92.

[0175] The second fuel cell 62 generates electric power based on the hydrogen supplied from the first storage device 51 , and supplies the electric power to the second power storage device 82 via the second conversion device 72 .

[0176] When the second charging rate R2 is less than the charging rate threshold value Thrc, and the second hydrogen filling rate rh2 is large and reaches or exceeds the hydrogen filling rate threshold value thrh, the control unit 3 sets the fourth valve B4 and the sixth valve B6 to the open state so that hydrogen is supplied from the second storage device 52 to the second fuel cell 62. In this case, with respect to the control unit 3, the control unit 3 sets the second switch S2 to the open state so that power is not supplied from the second power storage device 82 to the load 100 via the fifth conversion device 92.

[0177] The second fuel cell 62 generates electric power based on the hydrogen supplied from the second storage device 52 , and supplies the electric power to the second power storage device 82 via the second conversion device 72 .

[0178] When the second charging rate R2 is large and reaches or exceeds the charging rate threshold value Thrc, the control unit 3 turns on the second switch S2 so that power is supplied from the second power storage device 82 to the load 100 via the fifth conversion device 92. At this time, preferably, the sixth valve B6 is turned off so that power is not supplied from the second fuel cell 62 to the second power storage device 82 via the second conversion device 72.

[0179] (Charge and Discharge Control of Third Power Storage Device 83)

[0180] When the charging rate (third charging rate R3) of the third power storage device 83 is less than the charging rate threshold value Thrc, and the first hydrogen filling rate rh1 is large and reaches or exceeds the hydrogen filling rate threshold value thrh, the control unit 3 sets the third valve B3 and the seventh valve B7 to the open state so that hydrogen is supplied from the first storage device 51 to the third fuel cell 63. In this case, the control unit 3 sets the third switch S3 to the open state so that power is not supplied from the third power storage device 83 to the load 100 via the sixth conversion device 93.

[0181] The third fuel cell 63 generates electricity based on the hydrogen supplied from the first storage device 51 , and supplies the electricity to the third power storage device 83 via the third conversion device 73 .

[0182] When the third charging rate R3 is less than the charging rate threshold value Thrc, and the second hydrogen filling rate rh2 is large and reaches or exceeds the hydrogen filling rate threshold value thrh, the control unit 3 sets the fourth valve B4 and the seventh valve B7 to the open state so that hydrogen is supplied from the second storage device 52 to the third fuel cell 63. In this case, the control unit 3 sets the third switch S3 to the open state so that power is not supplied from the third power storage device 83 to the load 100 via the sixth conversion device 93.

[0183] The third fuel cell 63 generates electricity based on the hydrogen supplied from the second storage device 52 , and supplies the electricity to the third power storage device 83 via the third conversion device 73 .

[0184] When the third charging rate R3 is large and reaches or exceeds the charging rate threshold value Thrc, the control unit 3 turns on the third switch S3 so that the third power storage device 83 supplies power to the load 100 via the sixth conversion device 93. At this time, preferably, the seventh valve B7 is turned off so that power is not supplied from the third fuel cell 63 to the third power storage device 83 via the third conversion device 73.

[0185] (Application example of charge and discharge control)

[0186] When the power consumed by the load 100 is large and the first charging rate R1, the second charging rate R2, and the third charging rate R3 are all increased to or above the charging rate threshold Thrc, the control unit 3 turns on the first switch S1, the second switch S2, and the third switch S3 so as to supply power from the first power storage device 81, the second power storage device 82, and the third power storage device 83 to the load 100. At this time, preferably, the fifth valve B5, the sixth valve B6, and the seventh valve B7 are turned off so as not to supply power from the first fuel cell 61 to the first power storage device 81, from the second fuel cell 62 to the second power storage device 82, and from the third fuel cell 63 to the third power storage device 83.

[0187] Furthermore, the control unit 3 opens the first valve B1 and the second valve B2 so as to supply hydrogen from the hydrogen generator 31 to the first storage device 51 and the second storage device 52 .

[0188] (Effects of installing multiple hydrogen storage devices, fuel cells, and power storage devices)

[0189] Hydrogen filling can be performed by one of the plurality of hydrogen storage devices (for example, the first storage device 51 ), and hydrogen can be supplied to the fuel cell by another hydrogen storage device (for example, the second storage device 52 ).

[0190] Furthermore, one of the plurality of fuel cells (for example, the first fuel cell 61 ) can be put to rest, and the other fuel cell can supply electric power to the power storage device (for example, the second fuel cell 62 ).

[0191] Furthermore, electric power can be supplied to the external load 100 using the power storage device (for example, the first power storage device 81 ) that is not being charged.

[0192] Therefore, filling and releasing of hydrogen can be performed safely.

[0193] In addition, the burden on the fuel cell and the power storage device can be reduced, making them less likely to deteriorate.

[0194] (Effect of supplying power to the power storage device after conversion from DC to AC)

[0195] Compared with a method of supplying electric power to the power storage device without converting the electric power into alternating current, it is possible to easily adjust the voltage to a voltage suitable for charging the power storage device.

[0196] (Effect of using the power generating unit 20)

[0197] The compressor is driven by the power generated by the power generation unit 20. Therefore, the power obtained by the power generation unit 10 can be used to efficiently perform electrolysis to generate a large amount of hydrogen.

[0198] (Application examples of the number of storage devices, fuel cells, and power storage devices)

[0199] In the first embodiment, an example of using two storage devices (a first storage device 51 and a second storage device 52), three fuel cells (a first fuel cell 61, a second fuel cell 62, and a third fuel cell 63), and three power storage devices (a first power storage device 81, a second power storage device 82, and a third power storage device 83) is described.

[0200] However, the number of storage devices may be 3 or more. In addition, the number of fuel cells may be 2 or 4 or more. In addition, the number of power storage devices may be 2 or 4 or more.

[0201] Alternatively, only one fuel cell may be provided (see the second embodiment). Figure 2 ).

[0202] In this case, the first fuel cell 61 supplies power to the first conversion device 71, the second conversion device 72, and the third conversion device 73. In addition, a fourth switch S4 for controlling the on / off of the power supply from the first fuel cell 61 to the first conversion device 71, a fifth switch S5 for controlling the on / off of the power supply from the first fuel cell 61 to the second conversion device 72, and a sixth switch S6 for controlling the on / off of the power supply from the first fuel cell 61 to the third conversion device 73 are provided.

[0203] (Effects of installing multiple hydrogen storage devices and power storage devices)

[0204] Hydrogen filling can be performed by one of the plurality of hydrogen storage devices (for example, the first storage device 51 ), and hydrogen can be supplied to the fuel cell by another hydrogen storage device (for example, the second storage device 52 ).

[0205] Furthermore, electric power can be supplied to the external load 100 using the power storage device (for example, the first power storage device 81 ) that is not being charged.

[0206] Therefore, filling and releasing of hydrogen can be performed safely.

[0207] In addition, the burden on the power storage device can be reduced, making it less likely to deteriorate.

[0208] Several embodiments of the present invention have been described, but the above embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments may be implemented in various other ways, and various omissions, substitutions, and changes may be made without departing from the scope of the invention. The above embodiments and their variations are included in the invention and its equivalent scope recorded in the claims, as are those included in the scope of the invention and its purport.

[0209] Description of Reference Numerals

[0210] 1. Power supply system

[0211] 3. Control Unit

[0212] 10 Power Generation Department

[0213] 1111st power generation device

[0214] 12 Second power generation device

[0215] 20 Power generation unit

[0216] 30 Hydrogen supply unit

[0217] 31 Hydrogen generation device

[0218] 33 Pump

[0219] 35 Electrolyte storage

[0220] 40 Compression

[0221] 411st compression device

[0222] 42 Second compression device

[0223] 50 Hydrogen storage

[0224] 51 1st storage device

[0225] 52 Second storage device

[0226] 60 Fuel Cell Department

[0227] 61 No.1 Fuel Cell

[0228] 62 No. 2 Fuel Cell

[0229] 63 No.3 Fuel Cell

[0230] 701st Conversion Unit

[0231] 71 1st conversion device

[0232] 72 Second conversion device

[0233] 73 3rd conversion device

[0234] 80 Power storage unit

[0235] 81 First power storage device

[0236] 82 Second power storage device

[0237] 83 Third power storage device

[0238] 90 No. 2 Conversion Unit

[0239] 91 4th conversion device

[0240] 92 No. 5 conversion device

[0241] 93 No. 6 conversion device

[0242] 100 load

[0243] B1 valve 1

[0244] B2 Second valve

[0245] B3 Valve 3

[0246] B4 No.4 valve

[0247] B5 No.5 valve

[0248] B6 No. 6 valve

[0249] B7 valve 7

[0250] P11 Electric power supplied from the first power generation device and the second power generation device

[0251] qv1 Remaining amount of electrolyte in the hydrogen generator

[0252] R1: First charging rate (charging rate of the first power storage device)

[0253] R2: Second charging rate (charging rate of the second power storage device)

[0254] R3: third charging rate (charging rate of the third power storage device)

[0255] rh1 1st hydrogen filling rate (hydrogen filling rate of the 1st storage device)

[0256] rh2 second hydrogen filling rate (hydrogen filling rate of the second storage device)

[0257] The amount of rotation per unit time of the rv1 power generation unit

[0258] S1 1st switch

[0259] S2 2nd switch

[0260] S3 3rd switch

[0261] S4 4th switch

[0262] S5 5th switch

[0263] S6 6th switch

[0264] Thp Power Threshold

[0265] Thqv remaining amount threshold

[0266] Thrc Charge rate threshold

[0267] thrh Hydrogen filling rate threshold

[0268] Thrv rotation threshold

Claims

1. A power supply system for supplying power to an external load, wherein: The power supply system comprises: a hydrogen supply unit including a hydrogen generator that generates hydrogen by electrolysis; a hydrogen storage unit including a first storage device and a second storage device for storing hydrogen obtained from the hydrogen supply unit; a fuel cell unit including a first fuel cell and a second fuel cell that generate electricity based on hydrogen supplied from the hydrogen storage unit; a power storage unit including a first power storage device for storing the power obtained by the first fuel cell and a second power storage device for storing the power obtained by the second fuel cell; as well as Control Department, The control unit switches and controls the supply source of hydrogen to the first fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device. The control unit switches and controls the supply source of hydrogen to the second fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device. supplying electric power to the load from the first power storage device, the second power storage device, or both of the first power storage device and the second power storage device, When the first power storage device supplies electric power to the load, the control unit stops supplying hydrogen to the first fuel cell and enables supplying hydrogen to the second fuel cell. When the second power storage device supplies electric power to the load, the control unit stops supplying hydrogen to the second fuel cell and enables supplying hydrogen to the first fuel cell. The control unit stops supplying hydrogen to the first fuel cell and the second fuel cell when electric power is supplied from the first power storage device and the second power storage device to the load.

2. The power supply system according to claim 1, wherein: The fuel cell unit includes a third fuel cell that generates electricity based on hydrogen supplied from the hydrogen storage unit. The power storage unit includes a third power storage device that stores the electric power obtained by the third fuel cell.

3. The power supply system according to claim 2, wherein: When hydrogen is supplied from the first storage device to at least one of the first fuel cell, the second fuel cell, and the third fuel cell, the control unit stops supplying hydrogen from the hydrogen generating device to the first storage device, and forms a state in which hydrogen can be supplied from the hydrogen generating device to the second storage device. When hydrogen is supplied from the second storage device to at least one of the first fuel cell, the second fuel cell and the third fuel cell, the control unit stops supplying hydrogen from the hydrogen generating device to the second storage device and creates a state in which hydrogen can be supplied from the hydrogen generating device to the first storage device.

4. The power supply system according to claim 2 or 3, wherein: The power supply system comprises: a first conversion unit including a first conversion device, a second conversion device, and a third conversion device; The first conversion device converts the current form of the electric power from the first fuel cell from direct current to alternating current, and further from alternating current to direct current, and converts the electric power to a predetermined voltage so as to be stored in the first power storage device. The second conversion device converts the current form of the electric power from the second fuel cell from direct current to alternating current, and further from alternating current to direct current, and converts it to a predetermined voltage so as to be stored in the second power storage device. The third conversion device converts the current form of the electric power from the third fuel cell from direct current to alternating current, and further from alternating current to direct current, and converts the electric power to a predetermined voltage so as to be stored in the third power storage device.

5. A power supply system for supplying power to an external load, wherein: The power supply system comprises: a hydrogen supply unit including a hydrogen generator that generates hydrogen by electrolysis; a hydrogen storage unit including a first storage device and a second storage device for storing hydrogen obtained from the hydrogen supply unit; a fuel cell unit including a first fuel cell and a second fuel cell that generate electricity based on hydrogen supplied from the hydrogen storage unit; a power storage unit including a first power storage device for storing the power obtained by the first fuel cell and a second power storage device for storing the power obtained by the second fuel cell; Control Department; a power generation unit including at least one of a first power generation device for generating direct current power based on natural energy and a second power generation device for generating alternating current power based on natural energy; a compression unit that compresses the hydrogen obtained by the hydrogen generation device; as well as A power generation unit that generates power based on natural energy without converting it into electricity, The control unit switches and controls the supply source of hydrogen to the first fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device. The control unit switches and controls the supply source of hydrogen to the second fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device. supplying electric power to the load from the first power storage device, the second power storage device, or both of the first power storage device and the second power storage device, The hydrogen generation device performs electrolysis based on the electric power from the power generation unit, The compression unit is driven based on the power obtained by the power generation unit.

6. The power supply system according to claim 5, wherein: The hydrogen supply unit includes: a pump for supplying electrolyte to the hydrogen generator; The pump and the compression unit are driven based on power obtained by the power generation unit.

7. The power supply system according to claim 5, wherein: The power generation unit generates a rotational force as the power based on at least one of wind power and waves. The compression part is driven based on the rotational force obtained by the power generation part.

8. The power supply system according to any one of claims 1 to 3, wherein: The power supply system includes a power generation unit including at least one of a first power generation device that generates DC power based on natural energy and a second power generation device that generates AC power based on natural energy. The hydrogen generator performs electrolysis based on the electric power from the power generation section.

9. A power supply system for supplying power to an external load, wherein: The power supply system comprises: a hydrogen supply unit including a hydrogen generator that generates hydrogen by electrolysis; a hydrogen storage unit including a first storage device and a second storage device for storing hydrogen obtained from the hydrogen supply unit; a fuel cell section including a fuel cell that generates electricity based on hydrogen supplied from the hydrogen storage section; a power storage unit including a first power storage device and a second power storage device that store the power obtained by the fuel cell; Control Department; a power generation unit including at least one of a first power generation device for generating direct current power based on natural energy and a second power generation device for generating alternating current power based on natural energy; a compression unit that compresses the hydrogen obtained by the hydrogen generation device; as well as A power generation unit that generates power based on natural energy without converting it into electricity, The control unit switches and controls the supply source of hydrogen to the fuel cell to the first storage device, the second storage device, or both the first storage device and the second storage device. supplying electric power to the load from the first power storage device, the second power storage device, or both of the first power storage device and the second power storage device, The hydrogen generation device performs electrolysis based on the electric power from the power generation unit, The compression unit is driven based on the power obtained by the power generation unit.

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