JP2015047020A - Power supply system - Google Patents

Power supply system Download PDF

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JP2015047020A
JP2015047020A JP2013177397A JP2013177397A JP2015047020A JP 2015047020 A JP2015047020 A JP 2015047020A JP 2013177397 A JP2013177397 A JP 2013177397A JP 2013177397 A JP2013177397 A JP 2013177397A JP 2015047020 A JP2015047020 A JP 2015047020A
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power
storage device
distribution board
fuel cell
power storage
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JP2013177397A
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JP5852067B2 (en
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真宏 原田
Masahiro Harada
真宏 原田
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大和ハウス工業株式会社
Daiwa House Industry Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/40Energy efficient batteries, ultracapacitors, supercapacitors or double-layer capacitors charging or discharging systems or methods, e.g. auxiliary power consumption reduction, resonant chargers or dischargers, resistive losses minimisation

Abstract

Electric power that does not hinder the learning function of a fuel cell, can effectively use all of the electric power generated by the fuel cell, and can efficiently charge the electric power generated by the power generation unit Provide a supply system.
When the power storage device 40 is DC-charged (DC charging) by the power directly supplied from the solar power generation unit 30 to the power storage device 40, and the arrangement of the power storage device 40 is switched to the downstream side of the distribution board 10. The electric power discharged from the power storage device 40 can be supplied to the distribution board 10 from the downstream side, and the fuel cell 80 can supply the distribution board 10 to supply the surplus power to the power storage device 40. When the arrangement of 40 is switched to the upstream side of the distribution board 10, the electric power discharged from the power storage device 40 can be supplied to the distribution board 10 from the upstream side, and the fuel cell 80 learns based on the supplied electric power. The function can be executed.
[Selection] Figure 5

Description

  The present invention relates to a technology of a power supply system.

  Conventionally, a distribution board that is connected to a commercial power source and distributes power to a load, and a learning function that is connected between the commercial power source and the distribution board and learns information about the power consumption of the load, It is possible to generate electric power according to a power generation plan that is updated as appropriate based on the learning function, a fuel cell that supplies the generated electric power to the distribution board, chargeable / dischargeable electric power, A technology of a power supply system including a power storage device that supplies the distribution board is known. For example, as described in Patent Document 1.

  The technology (power interchange system) described in Patent Document 1 is connected to a commercial power supply, and is connected between a distribution board (DC distribution board) that distributes power to a load, and between the commercial power supply and the distribution board. And having a learning function for learning information related to the power consumption of the load, capable of generating power according to a power generation plan that is appropriately updated based on the learning function, and supplying the generated power to the distribution board And a power storage device (storage battery) capable of charging and discharging electric power and supplying the discharged electric power to the distribution board.

  With such a configuration, in the technology described in Patent Document 1, not only electric power from a commercial power supply but also electric power from a fuel cell or a power storage device can be supplied to a distribution board, and load is supplied by electric power from these supply sources. The power consumption can be covered. In the fuel cell, by executing the learning function, the power generated by the fuel cell can be supplied to the distribution board when the amount of power consumed by the load is relatively large.

  However, in the technique described in Patent Document 1, a predetermined problem may occur due to the arrangement of each device.

Below, the predetermined problem resulting from arrangement | positioning of each apparatus in the technique of patent document 1 is demonstrated using FIGS. 7-9.
7 to 9 show the configuration of the technique described in Patent Document 1 in a simplified manner as appropriate.

  In the technique described in Patent Document 1 shown in FIG. 7 (hereinafter referred to as “first system 501”), commercial power supply 100 and distribution board 510 are connected via first power path 520. The fuel cell 580 is disposed upstream of the distribution board 510. In addition, the power storage device 540 is disposed on the upstream side of the fuel cell 580. A power generation unit 530 that can generate power using natural energy is disposed upstream of the power storage device 540.

  In such a first system 501, when the power generated by the fuel cell 580 is supplied to the distribution board 510 and surplus power (surplus power) is generated, the power storage device 540 is more than the fuel cell 580. Since it is arranged on the upstream side, the power storage device 540 cannot be charged with the surplus power. That is, the first system 501 has a problem that not all of the electric power generated by the fuel cell 580 can be effectively used.

  Further, in order to avoid such a problem that occurs in the first system 501, the technique shown in FIG. 8 (hereinafter referred to as “second system 502”) is assumed. In the second system 502, the arrangement of the power storage device 540 is different from that of the first system 501. Specifically, the power storage device 540 is connected to the distribution board 510 via the second power path 550 and is disposed on the downstream side of the distribution board 510.

  In such a second system 502, when surplus power (surplus power) is generated by supplying power generated by the fuel cell 580 to the distribution board 510, the surplus power is passed through the second power path 550. Via the power storage device 540 and can be charged. That is, all of the electric power generated by the fuel cell 580 can be used effectively, and problems that occur in the first system 501 can be avoided.

  However, in the second system 502, when the power storage device 540 is discharged and supplies the discharged power to the distribution board 510 from the downstream side, the discharged power is not distributed via the first power path 520. It is supplied to the board 510. Here, the fuel cell 580 is configured to be able to execute a function (learning function) that acquires information related to power flowing through the first power path 520 and learns information related to power consumption of the load based on the acquired information. The That is, in the second system 502, since the electric power discharged from the power storage device 540 is supplied to the distribution board 510 without passing through the first power path 520, the fuel cell 580 cannot execute the learning function. Thus, the second system 502 has a problem that the learning function of the fuel cell 580 is hindered.

  Further, in the second system 502, when the power generated by the power generation unit 530 is supplied to the power storage device 540 and charged, the power (DC power) generated by the power generation unit 530 is once converted into AC power. After that, it is necessary to convert it to DC power again. Thus, since it is necessary to convert electric power a plurality of times, there is a problem that conversion loss occurs and charging cannot be performed efficiently.

JP 2011-101532 A

  The present invention has been made in view of the above situation, and the problem to be solved is that the learning function of the fuel cell is not hindered and that all the power generated by the fuel cell is effectively utilized. Furthermore, it is to provide a power supply system that can efficiently charge the power generated by the power generation unit.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to claim 1, a distribution board connected to a commercial power source and distributing power to a load, and connected between the commercial power source and the distribution board, learns information on power consumption of the load. A fuel cell that has a learning function, can generate power according to a power generation plan that is appropriately updated based on the learning function, and that supplies the generated power to the distribution board; A power storage device that supplies the discharged power to the distribution board; and a power generation unit that is connected to the power storage device and is capable of generating power using natural energy and that supplies the generated power to the power storage device. Switching means for switching the arrangement of the power storage device to be either upstream or downstream of the distribution board, and the electric power supplied directly from the power generation unit to the power storage device Power storage device is DC And when the arrangement of the power storage device is switched to the downstream side of the distribution board, the power discharged from the power storage device can be supplied to the distribution board from the downstream side, and the fuel cell When the surplus power supplied to the distribution board can be supplied to the power storage device, and the arrangement of the power storage device is switched to the upstream side of the distribution board, the power discharged from the power storage device is upstream. The distribution panel can be supplied from the side, and the fuel cell can execute the learning function based on the supplied power.

  According to a second aspect of the present invention, all the electric power generated by the power generation unit is supplied to the power storage device.

  According to a third aspect of the present invention, when the fuel cell is generating power when the power storage device is discharged, the arrangement of the power storage device is switched to the downstream side of the distribution board, and the power storage device is discharged. When the fuel cell is not generating power, the arrangement of the power storage device is switched to the upstream side of the distribution board.

  According to a fourth aspect of the present invention, there is provided a disconnector for disconnecting from the commercial power source when a power failure occurs.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, the learning function of the fuel cell is not hindered, all of the electric power generated by the fuel cell can be used effectively, and furthermore, the electric power generated by the power generation unit is efficiently charged. Can do.

  In Claim 2, all the electric power generated by the power generation unit can be preferentially utilized by the power storage device.

  In claim 3, depending on whether or not the fuel cell is generating power, the learning function of the fuel cell is not hindered, and all of the power generated by the fuel cell can be used effectively, The electric power generated by the power generation unit can be charged efficiently.

  In claim 4, even if a power failure occurs, the fuel cell can generate electric power.

The block diagram which showed the structure of the electric power supply system which concerns on one Embodiment of this invention. Similarly, the schematic diagram shown about the supply aspect of the electric power in the case of making an electrical storage apparatus charge electric power among the supply aspects of the electric power regarding charging / discharging of an electrical storage apparatus. Similarly, the schematic diagram shown about the 1st supply aspect among the supply aspects of the electric power in the case of discharging electric power from an electrical storage apparatus. Similarly, the schematic diagram shown about the 2nd supply aspect among the supply aspects of the electric power in the case of discharging electric power from an electrical storage apparatus. Similarly, the schematic diagram shown about the supply mode of the electric power of a power supply system at the time of a power failure. Similarly, the block diagram which showed the structure of the solar power generation part and the electrical storage apparatus. The schematic diagram which showed the 1st structure which is an example of the conventional electric power supply system. The schematic diagram which showed the 2nd structure which is an example of the conventional electric power supply system. Similarly, the block diagram which showed the 2nd structure.

Below, the structure of the electric power supply system 1 which is one Embodiment of the "electric power supply system" concerning this invention is demonstrated using FIG.
In the following description, “upstream side” and “downstream side” are defined based on the supply direction of power from the commercial power supply 100.

  The power supply system 1 is provided in a house, supplies power from the commercial power supply 100, the fuel cell 80, and the like to the distribution board 10 and supplies it to a load (not shown) (in-house load). The power supply system 1 is configured so as to be capable of interconnecting with the commercial power source 100 (capable of grid interconnection). The power supply system 1 mainly includes a distribution board 10, a first power path 20, a solar power generation unit 30, a power storage device 40, a second power path 50, a third power path 60, a fourth power path 70, a fuel cell 80, A disconnector 90 is provided.

  The distribution board 10 distributes the power supplied from the power supply source to the load according to the power consumption of the load. The distribution board 10 is connected to the commercial power source 100, the solar power generation unit 30, the fuel cell 80, and the power storage device 40, which are power supply sources, via a predetermined path, and power from these is appropriately supplied.

  In addition, in this embodiment, a load is a circuit connected to the electrical appliance etc. in which electric power is consumed in a house. The load is provided, for example, for each room or for each outlet dedicated to a device that consumes a large amount of power such as an air conditioner, and is connected to the distribution board 10 (not shown).

  The first power path 20 is a path through which power can be distributed. The first power path 20 is composed of a conducting wire or the like. The first power path 20 has one side connected to the commercial power supply 100 and the other side connected to the distribution board 10. As described above, the commercial power supply 100 and the distribution board 10 are configured to allow power to flow through the first power path 20.

The solar power generation unit 30 is a device that generates power using sunlight (natural energy). The solar power generation unit 30 includes a solar panel (PV) 31 and the like which will be described later. The solar power generation unit 30 is installed in a sunny place such as on the roof of a house. The solar power generation unit 30 generates electric power (DC power) and outputs the generated electric power.
A detailed description of the configuration of the solar power generation unit 30 will be given later.

The power storage device 40 is a device that can charge power and can discharge the charged power. The power storage device 40 includes a storage battery 44, a changeover switch 41, and the like which will be described later. The power storage device 40 can discharge the charged power and supply it to the distribution board 10. In addition, the power storage device 40 is configured to be capable of load following operation that appropriately changes the amount of electric power to be discharged as necessary.
A detailed description of the configuration of the power storage device 40 and the changeover switch 41 of the power storage device 40 will be given later.

  The second power path 50 is a path through which power can be distributed. The second power path 50 is constituted by a conducting wire or the like. The second power path 50 has one side connected to the power storage device 40 and the other side connected to the solar power generation unit 30. As described above, the power storage device 40 and the solar power generation unit 30 are configured to allow power to flow through the second power path 50.

  The third power path 60 is a path through which power can be distributed. The third power path 60 is composed of a conducting wire or the like. The third power path 60 has one side connected to the distribution board 10 and the other side connected to the power storage device 40 (more specifically, the changeover switch 41 of the power storage device 40). As described above, the distribution board 10 and the power storage device 40 are configured to allow power to flow through the third power path 60.

  The fourth power path 70 is a path through which power can be distributed. The fourth power path 70 is composed of a conducting wire or the like. The fourth power path 70 has one side connected to the middle part of the first power path 20 (hereinafter referred to as “second connection part 22”), and the other side connected to the power storage device 40 (more specifically, the power storage device 40. To the changeover switch 41). As described above, the distribution board 10 and the power storage device 40 are configured to allow power to flow through the first power path 20 and the fourth power path 70.

  The fuel cell 80 is a device that generates electric power using a supplied fuel such as hydrogen. The fuel cell 80 includes a hot water storage unit (not shown) and can boil hot water in the hot water storage unit using heat generated during power generation. The fuel cell 80 includes a polymer electrolyte fuel cell (PEFC), a control unit, and the like. The fuel cell 80 generates power according to a power generation plan to be described later, and outputs the generated power. The fuel cell 80 is connected between the second connection portion 22 and the distribution board 10 in the first power path 20 (hereinafter referred to as “first connection portion 21”). Thus, the fuel cell 80 can supply the generated power to the distribution board 10 through the first power path 20. In the present embodiment, when the fuel cell 80 is generating power, the power generated by the fuel cell 80 is set to be supplied to the distribution board 10 in preference to the power from other sources. Is done.

  Further, the fuel cell 80 has a function of learning information related to the power consumption of the load based on predetermined information (more specifically, information on the power supplied to the distribution board 10 via the first power path 20) ( Hereinafter, it is referred to as “learning function”). The fuel cell 80 can appropriately update (create) the power generation plan based on the information learned by the learning function. The power generation plan is for estimating a time period and a day of the week when the amount of power consumed by the load is relatively large, and controlling the power generation of the fuel cell 80 so as to generate power in the estimated time period and a day of the week. Refers to the plan.

  Thus, the power generated by the fuel cell 80 when the amount of power consumed by the load is relatively large (at the optimal timing) by generating power according to the power generation plan that is updated as appropriate. Can be supplied to the distribution board 10. That is, the electric power generated by the fuel cell 80 can be used efficiently, and the amount of electric power (the amount of power purchased) supplied from the commercial power supply 100 to the distribution board 10 can be reduced to save electric power charges. .

  In the present embodiment, the fuel cell 80 is set so that the maximum power generation amount is 700 W. Further, in the present embodiment, the fuel cell 80 is stopped regularly (or irregularly) for reasons such as maintenance and the amount of hot water in the hot water storage unit being a certain amount or more, and the operation is stopped. It is set not to generate electricity while

  Further, the fuel cell 80 is configured to be able to acquire information related to the power supplied to the distribution board 10 via the first power path 20 other than the power generated by the fuel cell 80. The fuel cell 80 can acquire (calculate) information related to the power supplied to the distribution board 10 (that is, power consumption of the load) based on the acquired information and information related to the power generated by the fuel cell 80. Composed. In this way, the fuel cell 80 can acquire and learn information related to the power consumption of the load, and can appropriately update (create) the power generation plan based on the learned information.

  The disconnector 90 disconnects the power supply system 1 from the commercial power supply 100. The disconnector 90 is connected to the upstream side of the second connecting portion 22 in the first power path 20. The circuit breaker 90 is turned on during normal times (when there is no power failure). When the disconnecting device 90 is turned on, the power supply system 1 can be connected to the commercial power supply 100 (can be connected to the grid). On the other hand, the circuit breaker 90 is turned off in an emergency (when a power failure occurs). When the circuit breaker 90 is turned off, the power supply system 1 is disconnected from the commercial power supply 100, and the power supply system 1 becomes inoperable with the commercial power supply 100 (system interconnection is impossible).

  Below, the structure of the changeover switch 41 which the electrical storage apparatus 40 has is demonstrated in detail.

  The change-over switch 41 is used to switch the power distribution and the direction between the distribution board 10 and the power storage device 40. The changeover switch 41 is provided at a connection portion between the third power path 60 and the fourth power path 70 and the power storage device 40.

  More specifically, in the changeover switch 41, when both the contact 46 on the third power path 60 side and the contact 47 on the fourth power path 70 side are turned off, the distribution board 10 and the power storage device 40 are Not connected. That is, when both the contact 46 on the third power path 60 side and the contact 47 on the fourth power path 70 side are turned off, the distribution board 10 and the power storage device 40 are in a state in which power distribution is not possible. Can be switched to.

  Further, in the changeover switch 41, when the contact 46 on the third power path 60 side is turned on and the contact 47 on the fourth power path 70 side is turned off, the distribution board 10 and the power storage device 40 are connected to each other. The three power paths 60 are connected. That is, when the contact 46 on the third power path 60 side is turned on and the contact 47 on the fourth power path 70 side is turned off, the distribution board 10 and the power storage device 40 pass through the third power path 60. Through which the power can be distributed. In such a case, the power storage device 40 is located on the downstream side of the distribution board 10.

  Further, in the changeover switch 41, when the contact 47 on the fourth power path 70 side is turned on and the contact 46 on the third power path 60 side is turned off, the distribution board 10 and the power storage device 40 are connected to each other. The first power path 20, the fourth power path 70 and the changeover switch 41 are connected. That is, when the contact 47 on the fourth power path 70 side is turned on and the contact 46 on the third power path 60 side is turned off, the distribution board 10 and the power storage device 40 are connected to the first power path 20 and The state is switched to a state in which power can be distributed via the fourth power path 70. In such a case, the power storage device 40 is located on the upstream side of the distribution board 10.

  As described above, the changeover switch 41 included in the power storage device 40 can switch the arrangement of the power storage device 40 so that it is either upstream or downstream of the distribution board 10.

  Below, the supply mode of the electric power of the electric power supply system 1 at the time of normal (when there is no power failure) is demonstrated easily.

  The solar power generation unit 30, the fuel cell 80, the power storage device 40 (switching switch 41), and the disconnector 90 are each connected to a control device (not shown), and various information is managed by the control device. Various operations such as changing the direction of power distribution are controlled.

  Electric power from the commercial power supply 100 is supplied to the distribution board 10 via the first power path 20. Further, the electric power generated by the fuel cell 80 is supplied to the distribution board 10 via the first power path 20. Thus, a resident such as a house can turn on the lighting or use a cooking utensil or an air conditioner by the power from the commercial power source 100 or the fuel cell 80. Further, similarly to the power from the commercial power supply 100 and the power generated by the fuel cell 80, the power generated by the solar power generation unit 30 can be supplied to the distribution board 10 via a predetermined path.

  As described above, the power (load power consumption) distributed to the load by the distribution board 10 is generated not only from the commercial power supply 100 but also from the power generated by the fuel cell 80 or the solar power generation unit 30. Can use the power. Thereby, the amount of electric power (amount of power purchased) supplied from the commercial power supply 100 to the distribution board 10 can be reduced, and the electric power charge can be saved.

  Further, when the power consumption of the load can be provided only by the power generated by the fuel cell 80 and surplus power (surplus power) is generated in the power generated by the fuel cell 80, the surplus power is converted into the commercial power source 100. You can reverse the current and sell electricity. In addition, when the power consumption of the load can be provided only by the power generated by the fuel cell 80, the power generated by the solar power generation unit 30 can be flown back to the commercial power source 100 and sold. As a result, power charges can be saved, and economic benefits can be obtained.

  Further, the power from the commercial power source 100 and the power generated by the fuel cell 80 can be supplied to the power storage device 40 through the first power path 20, the distribution board 10, and the third power path 60 to be charged. . And the electric power charged in the electrical storage apparatus 40 is discharged as needed, and is supplied to the distribution board 10 via the predetermined | prescribed path | route mentioned later. In this way, the power consumption of the load can be covered by charging / discharging of the power storage device 40, so that the amount of power (amount of power purchased) supplied from the commercial power supply 100 to the distribution board 10 can be reduced, and the power charge can be saved. it can. Similarly to the power from the commercial power source 100 and the power generated by the fuel cell 80, the power generated by the solar power generation unit 30 is also supplied to the distribution board 10 through the second power path 50 and charged. Can be made.

  Below, the electric power supply aspect regarding charging / discharging of the electrical storage apparatus 40 among the electric power supply aspects of the electric power supply system 1 mentioned above is demonstrated in detail.

  First, of the power supply modes related to charging / discharging of the power storage device 40, a power supply mode in the case where the power storage device 40 is charged with power will be described with reference to FIG.

  As shown in FIG. 2, in the power supply mode when the power storage device 40 is charged with power, the changeover switch 41 is turned on when the contact 46 on the third power path 60 side is turned on. The contact 47 is turned off. That is, in the power supply mode in the case where the power storage device 40 is charged with power, the distribution board 10 and the power storage device 40 are switched to a state in which power can be distributed via the third power path 60. Thus, the power storage device 40 is connected to the downstream side of the distribution board 10.

  With such a configuration, for example, when surplus power (surplus power) is generated by supplying power generated by the fuel cell 80 to the distribution board 10, the surplus power is transmitted via the third power path 60. The power storage device 40 can be supplied and charged. That is, all the electric power generated by the fuel cell 80 can be used effectively.

  2 shows a state where only the electric power generated by the fuel cell 80 is supplied to the power storage device 40, the electric power from the commercial power source 100 and the electric power generated by the solar power generation unit 30 are also shown. Similarly, the power storage device 40 can be supplied and charged.

  Next, among the power supply modes related to charging / discharging of the power storage device 40, a power supply mode when discharging power from the power storage device 40 will be described.

Note that the power supply mode in the case of discharging power from the power storage device 40 is a different supply mode depending on whether or not the fuel cell 80 is generating power.
More specifically, the power supply mode when discharging power from the power storage device 40 includes a supply mode when the fuel cell 80 is generating power (hereinafter referred to as “first supply mode”), and a fuel cell. It is divided into a supply mode (hereinafter referred to as “second supply mode”) when 80 is not generating power.

  Below, the 1st supply aspect is demonstrated in detail among the supply aspects of the electric power in the case of discharging electric power from the electrical storage apparatus 40. FIG.

  As shown in FIG. 3, in the first supply mode, in the changeover switch 41, the contact 46 on the third power path 60 side is turned on and the contact 47 on the fourth power path 70 side is turned off. That is, in the first supply mode, the distribution board 10 and the power storage device 40 are switched to a state in which power can be distributed via the third power path 60. Thus, the power storage device 40 is connected to the downstream side of the distribution board 10.

  First, the power generated by the fuel cell 80 is supplied to the distribution board 10 via the first power path 20. Then, when the power consumption of the load cannot be met only with the power supplied from the fuel cell 80 (that is, when the power consumption of the load is 700 W or more of the maximum power generation amount of the fuel cell 80), the power consumption is insufficient. Electric power for supplementing electric power (insufficient electric power) is supplied from the power storage device 40 to the distribution board 10.

  Specifically, when the shortage of power occurs, the power storage device 40 discharges a power amount corresponding to the power amount of the shortage power. Then, the electric power discharged from the power storage device 40 is supplied to the distribution board 10 from the downstream side via the third power path 60. In addition, when the power discharged from the power storage device 40 alone cannot cover the insufficient power, the power from the commercial power supply 100 is further supplied to the distribution board 10.

  The fuel cell 80 is configured to be able to acquire information related to the power supplied to the distribution board 10 via the first power path 20 other than the power generated by the fuel cell 80. That is, when the electric power from the commercial power source 100 is supplied to the distribution board 10 via the first electric power path 20, the fuel cell 80 can acquire information regarding the supplied electric power. Thereby, the fuel cell 80 can acquire information related to the power (power consumption of the load) supplied to the distribution board 10 based on the acquired information and information related to the power generated by itself. For example, when power from the commercial power source 100 is supplied to the distribution board 10 via the first power path 20, the fuel cell 80 has at least the amount of power consumed by the load (maximum power generation of the fuel cell 80. It is possible to acquire (learn) information that the amount is 700 W or more.

  In this way, the fuel cell 80 has information on the power consumption of the load in the learned time zone and day of the week (that is, the amount of power consumption of the load is at least 700 W or more, and the maximum power generation in the learned time zone and day of the week. Information) that it is sufficient to generate a large amount of electric power. Thus, in the first supply mode, the fuel cell 80 can learn information on the power consumption of the load, and the learning function is not hindered.

  Below, a 2nd supply aspect is demonstrated in detail among the supply aspects of the electric power in the case of discharging electric power from the electrical storage apparatus 40. FIG.

  As shown in FIG. 4, in the second supply mode, in the changeover switch 41, the contact 47 on the fourth power path 70 side is turned on and the contact 46 on the third power path 60 side is turned off. That is, in the second supply mode, the distribution board 10 and the power storage device 40 are switched to a state in which power can be distributed via the first power path 20 and the fourth power path 70. Thus, the power storage device 40 is connected to the upstream side of the distribution board 10.

  And the electrical storage apparatus 40 discharges the electric power of the electric energy equivalent to the electric energy of the electric power consumption of load. Then, the electric power discharged from the power storage device 40 is supplied to the distribution board 10 from the upstream side via the fourth power path 70 and the first power path 20. Then, when the power consumption of the load cannot be met only with the power supplied from the power storage device 40, the power for compensating for the insufficient power (insufficient power) is supplied from the commercial power supply 100 to the distribution board 10 from the upstream side. Is done.

  The fuel cell 80 is configured to be able to acquire information related to the power supplied to the distribution board 10 via the first power path 20 other than the power generated by the fuel cell 80. That is, in the fuel cell 80, when the power from the power storage device 40 is supplied to the distribution board 10 via the fourth power path 70 and the first power path 20, the power from the commercial power supply 100 is further received as the first power. When supplied to the distribution board 10 via the path 20, information regarding the supplied power can be acquired. Thereby, the fuel cell 80 uses the acquired information and the information related to the power generated by itself (that is, the information that the power generation is not performed), and the power supplied to the distribution board 10 (the power consumption of the load). ) Can be obtained.

  Thus, the fuel cell 80 can learn information regarding the power consumption of the load in the learned time zone and day of the week. Thus, in the second supply mode, the fuel cell 80 can learn information regarding the power consumption of the load, and the learning function is not hindered.

  In addition, when the power consumption of the load cannot be provided only by the power supplied from the power storage device 40, the power generated by the solar power generation unit 30 is used as power to make up for insufficient power (insufficient power). You can also. In such a case, the electric power generated by the solar power generation unit 30 is supplied from the upstream side to the distribution board 10 via the fourth power path 70 and the first power path 20 in the same manner as the power from the power storage device 40. Supplied. That is, in the second supply mode, even when the electric power generated by the solar power generation unit 30 is supplied to the distribution board 10, the fuel cell 80 can learn information on the power consumption of the load, and the learning function Is not disturbed.

  Thus, in the power supply system 1, when the power is discharged from the power storage device 40, the power supply mode is switched even if the fuel cell 80 is generating power or not generating power. Thus, the learning function of the fuel cell 80 can be prevented from being hindered.

  Below, the supply aspect of the electric power of the electric power supply system 1 at the time of a power failure is demonstrated using FIG.

  As shown in FIG. 5, when a power failure occurs, the disconnector 90 is turned off, the power supply system 1 is disconnected from the commercial power supply 100, and the power supply system 1 cannot be connected to the commercial power supply 100 (system interconnection). Impossible). Here, the fuel cell 80 is set to be inoperable if it is in a state where it can be interconnected with the commercial power source 100 (a grid connection is possible) when a power failure occurs. However, in this embodiment, since the power supply system 1 becomes inoperable with the commercial power supply 100 (system incapability) when a power failure occurs, the fuel cell 80 can be operated as in the case of no power failure. Become. In this way, even when a power failure occurs, the fuel cell 80 can be operated to generate electric power, and convenience can be improved.

  Further, as shown in FIG. 5, even when a power failure occurs, the power supply mode when discharging power from the power storage device 40 is the second supply mode. That is, even when a power failure occurs, the fuel cell 80 can learn information about the power consumption of the load, and the learning function is not hindered.

  Moreover, in this embodiment, it sets so that the electric power discharged from the electrical storage apparatus 40 at the time of a power failure may be 200V. As a result, an electric appliance or fuel cell 80 having a relatively large amount of power consumption such as a general air conditioner can be operated. Here, converting the electric power discharged from the power storage device 40 to 200V is not good in conversion efficiency. However, as will be described later, the power storage device 40 can efficiently charge (direct current) power generated by the solar power generation unit 30, and thus can continuously discharge the power. Thus, when a power failure occurs, it is possible to increase the choices of devices to be used (electric appliances, fuel cells 80, etc.).

  Below, the structure of the solar power generation part 30 and the electrical storage apparatus 40 is demonstrated in detail using FIG.

  The solar power generation unit 30 includes a solar panel (PV: Photovoltaic) 31 and a DC / DC converter 32.

  The solar panel 31 generates DC power by sunlight. The solar panel 31 outputs the generated DC power. The solar panel 31 is connected to the DC / DC converter 32 on the power output side. Thus, the DC power generated by the solar panel 31 is input to the DC / DC converter 32.

  The DC / DC converter 32 performs control to convert DC power input from the solar panel 31 into a predetermined voltage so that the maximum power can be extracted from the solar panel 31. The DC / DC converter 32 outputs DC power converted into a predetermined voltage. In the DC / DC converter 32, the power output side is connected to the power storage device 40 (more specifically, between the AC / DC converter 42 and the DC / DC converter 43 in the power storage device 40) via the second power path 50. Is done. Thus, the DC / DC converter 32 outputs the DC power converted into a predetermined voltage to the AC / DC converter 42 or the DC / DC converter 43 of the power storage device 40.

  Thus, all the electric power generated by the solar power generation unit 30 is temporarily supplied to the power storage device 40 (more specifically, the AC / DC converter 42 or the DC / DC converter 43). Thereby, all the electric power generated by the solar power generation unit 30 can be preferentially utilized by the power storage device 40. Specifically, the electric power generated by the solar power generation unit 30 is charged in the storage battery 44 as described later, or output from the power storage device 40 and sold for power as required by the power storage device 40. be able to.

  The power storage device 40 includes an AC / DC converter 42, a storage battery 44, and a DC / DC converter 43 in addition to the changeover switch 41 described above.

  The AC / DC converter 42 is a so-called bidirectional converter. AC / DC converter 42 is connected between changeover switch 41 and DC / DC converter 43 in power storage device 40.

  When AC power is supplied from the distribution board 10 to the power storage device 40, the AC / DC converter 42 converts the supplied AC power into DC power. The AC / DC converter 42 outputs the converted DC power. The AC / DC converter 42 is connected to the DC / DC converter 43 on the output side of DC power. In this way, the DC power converted by the AC / DC converter 42 is input to the DC / DC converter 43.

  In addition, when the DC power converted by the DC / DC converter 43 is input, the AC / DC converter 42 converts the DC power into AC power. The AC / DC converter 42 outputs the converted AC power. The AC / DC converter 42 is connected to the changeover switch 41 on the output side of the AC power. Thus, the AC power converted by the AC / DC converter 42 is supplied to the distribution board 10 by the changeover switch 41 via a predetermined path.

  Note that the AC / DC converter 42 is supplied not only with the DC power converted by the DC / DC converter 43 but also with the DC power supplied from the photovoltaic power generation unit 30 to the power storage device 40, and Even when the battery 44 is output without being charged, the DC power is converted into AC power.

  The storage battery 44 is configured to be able to charge and discharge electric power. In this embodiment, the storage battery 44 is constituted by a lithium ion battery.

  The DC / DC converter 43 controls charging / discharging of the storage battery 44. The DC / DC converter 43 is a so-called bidirectional converter. DC / DC converter 43 is connected between AC / DC converter 42 and storage battery 44 in power storage device 40.

  When controlling the discharge of the storage battery 44, the DC / DC converter 43 converts the power charged in the storage battery 44 into a predetermined voltage suitable for discharge. The DC / DC converter 43 outputs the converted DC power. The DC / DC converter 43 is connected to the AC / DC converter 42 on the power output side. Thus, the electric power converted by the DC / DC converter 43 is input to the AC / DC converter 42.

  Further, when the DC / DC converter 43 controls the charging of the storage battery 44, the DC power from the AC / DC converter 42 or the solar power generation unit 30 (more specifically, the DC / DC converter 32) is converted into the storage battery 44. Convert to the optimal voltage according to the charging status. The DC / DC converter 43 charges the storage battery 44 with the converted DC power.

  As described above, in the power supply system 1, the direct-current power generated by the solar power generation unit 30 can be directly supplied to the power storage device 40 and charged (DC charging). Thereby, since it is not necessary to provide a power conditioner or the like for converting the DC power generated by the solar power generation unit 30 into AC power, the configuration of the present system can be simplified. Moreover, there is no need to convert the DC power generated by the solar power generation unit 30 into AC power and then convert it again into DC power. That is, since it is not necessary to convert electric power multiple times, it is possible to prevent a conversion loss from occurring. In this way, the DC power generated by the solar power generation unit 30 can be efficiently charged in the power storage device 40.

As described above, the power supply system 1 is
A distribution board 10 connected to a commercial power source 100 and distributing power to a load;
Connected between the commercial power supply 100 and the distribution board 10 and has a learning function for learning information on the power consumption of the load, and can generate power according to a power generation plan that is appropriately updated based on the learning function A fuel cell 80 for supplying the generated power to the distribution board 10;
A power storage device 40 capable of charging and discharging electric power and supplying the discharged electric power to the distribution board 10;
A solar power generation unit 30 (power generation unit) connected to the power storage device 40 and capable of generating power using natural energy (sunlight) and supplying the generated power to the power storage device 40;
A change-over switch 41 (switching means) for switching the arrangement of the power storage device 40 so that it is either upstream or downstream of the distribution board;
Comprising
The power storage device 40 is DC-charged (DC charged) by the power supplied directly from the solar power generation unit 30 to the power storage device 40,
When the arrangement of the power storage device 40 is switched to the downstream side of the distribution board 10, the electric power discharged from the power storage device 40 can be supplied to the distribution board 10 from the downstream side, and the fuel cell 80 is able to supply the power storage device 40 with surplus power supplied to the distribution board 10;
When the arrangement of the power storage device 40 is switched to the upstream side of the distribution board 10, the power discharged from the power storage device 40 can be supplied to the distribution board 10 from the upstream side. Based on this, the fuel cell 80 can execute the learning function.

  With such a configuration, the learning function of the fuel cell 80 is not hindered, and all the electric power generated by the fuel cell 80 can be used effectively, and further, the electric power generated by the solar power generation unit 30 can be used. It can be charged efficiently.

In addition, the power supply system 1
All of the electric power generated by the solar power generation unit 30 is supplied to the power storage device 40.

  With such a configuration, all of the electric power generated by the solar power generation unit 30 can be preferentially utilized by the power storage device 40.

In addition, the power supply system 1
When the fuel cell 80 is generating electricity when the power storage device 40 is discharged, the arrangement of the power storage device 40 is switched to the downstream side of the distribution board 10,
In the case where the fuel cell 80 is not generating power when the power storage device 40 is discharged, the arrangement of the power storage device 40 is switched to the upstream side of the distribution board 10.

  With such a configuration, depending on whether or not the fuel cell 80 is generating power, the learning function of the fuel cell 80 is not hindered, and all of the power generated by the fuel cell 80 can be used effectively. Furthermore, the electric power generated by the solar power generation unit 30 can be charged efficiently.

In addition, the power supply system 1
A disconnector 90 that disconnects from the commercial power source 100 in the event of a power failure is provided.

  With such a configuration, even when a power failure occurs, the fuel cell 80 can generate power.

  In addition, in this embodiment, although the electric power supply system 1 was set as the structure provided in a house, it is not limited to this structure. For example, the power supply system 1 may be configured in a building such as an office or a public facility.

  Moreover, in this embodiment, although it was set as the structure which utilizes sunlight as natural energy in the solar power generation part 30, the "power generation part" which concerns on this invention is not limited to this. The natural energy to be used may be, for example, hydropower, wind power, tidal power and the like.

  In the present embodiment, the maximum power generation amount of the fuel cell 80 is set to be 700 W, but the present invention is not limited to this. For example, the maximum power generation amount of the fuel cell 80 may be 750 W or the like, and the power generation amount may be set to an arbitrary power generation amount.

  Moreover, in this embodiment, although the solar power generation part 30 was set as the structure which has the DC / DC converter 32, it can also be set as the structure which does not have the said DC / DC converter 32 concerned.

  In the present embodiment, the fuel cell 80 is an embodiment of a “fuel cell” according to the present invention. The “fuel cell” according to the present invention is not limited to a polymer electrolyte fuel cell (PEFC), and may have any learning function.

DESCRIPTION OF SYMBOLS 1 Power supply system 10 Distribution board 30 Solar power generation part 40 Power storage device 41 Changeover switch 80 Fuel cell 90 Disconnector

Claims (4)

  1. A distribution board connected to a commercial power source and distributing power to the load;
    It is connected between the commercial power supply and the distribution board, has a learning function for learning information on the power consumption of the load, and can generate power according to a power generation plan that is updated appropriately based on the learning function. A fuel cell for supplying the generated power to the distribution board;
    A power storage device capable of charging and discharging electric power and supplying the discharged electric power to the distribution board;
    A power generation unit connected to the power storage device, capable of generating power using natural energy, and supplying the generated power to the power storage device;
    Switching means for switching the arrangement of the power storage device to be either upstream or downstream of the distribution board; and
    Comprising
    The power storage device is DC-charged by power supplied directly from the power generation unit to the power storage device,
    When the arrangement of the power storage device is switched to the downstream side of the distribution board, the power discharged from the power storage device can be supplied from the downstream side to the distribution board, and the fuel cell is connected to the distribution board. The surplus power supplied to the panel can be supplied to the power storage device,
    When the arrangement of the power storage device is switched to the upstream side of the distribution board, the power discharged from the power storage device can be supplied to the distribution board from the upstream side, and the fuel is based on the supplied power. The battery can perform the learning function;
    A power supply system characterized by that.
  2. Supplying all of the power generated by the power generation unit to the power storage device;
    The power supply system according to claim 1.
  3. When the fuel cell is generating power when the power storage device is discharged, the arrangement of the power storage device is switched to the downstream side of the distribution board,
    When the fuel cell is not generating power when the power storage device is discharged, the arrangement of the power storage device is switched to the upstream side of the distribution board,
    The power supply system according to claim 1 or 2,
  4. A disconnector that disconnects from the commercial power source in the event of a power failure;
    The power supply system according to any one of claims 1 to 3, wherein
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009284590A (en) * 2008-05-20 2009-12-03 Osaka Gas Co Ltd Power generation system
WO2011114422A1 (en) * 2010-03-15 2011-09-22 株式会社正興電機製作所 Power supply system, power supply method, program, recording medium, and power supply controller
JP2012191757A (en) * 2011-03-10 2012-10-04 Osaka Gas Co Ltd Power supply system and power storage system
JP2013090436A (en) * 2011-10-18 2013-05-13 Itochu Enex Co Ltd Power control device, power supply system, power control method and program
JP2014233144A (en) * 2013-05-29 2014-12-11 大和ハウス工業株式会社 Power supply system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009284590A (en) * 2008-05-20 2009-12-03 Osaka Gas Co Ltd Power generation system
WO2011114422A1 (en) * 2010-03-15 2011-09-22 株式会社正興電機製作所 Power supply system, power supply method, program, recording medium, and power supply controller
JP2012191757A (en) * 2011-03-10 2012-10-04 Osaka Gas Co Ltd Power supply system and power storage system
JP2013090436A (en) * 2011-10-18 2013-05-13 Itochu Enex Co Ltd Power control device, power supply system, power control method and program
JP2014233144A (en) * 2013-05-29 2014-12-11 大和ハウス工業株式会社 Power supply system

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