JP2014176216A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of preventing occurrence of bottom-up of surplus power.SOLUTION: A power supply system comprises: a first power path 60 connected to a photovoltaic power generation unit 10 and commercial power supply 200; a second power path 70 connected to a power distribution board 50; a third power path 80; a changeover switch 91 for connecting either of the first power path 60 and third power path 80 to the second power path 70; a bypass power path 100 for connecting the first power path 60 and second power path 70; a first switch 110 provided on the bypass power path 100; and a second switch 120 provided on the second power path 70 in the vicinity of the changeover switch 91. Power distribution through the first switch 110 is disabled and power distribution through the second switch 120 is enabled, only when the photovoltaic power generation unit 10 does not generate power and an on-vehicle type power storage device 30 is connected to the third power path 80.

Description

  The present invention relates to a technology of a power supply system provided in a house or the like.

  Conventionally, a technique for supplying electric power from an electric power supply system provided in a house or the like to an electric vehicle or a plug-in hybrid vehicle and charging a relatively large power storage device (storage battery) included in the electric vehicle or the like has been publicly known. Yes. For example, as described in Patent Document 1.

  Patent Document 1 also describes that power can be effectively utilized by introducing a solar power generation unit (solar power generation system) into the power supply system. In such a power supply system, for example, it is possible to supply power charged in a power storage device such as an electric vehicle or power generated in a solar power generation unit to a load used in a house or the like. .

  Here, in the power supply system as described above, surplus power generated in the solar power generation unit (remaining power without being used in a load such as a house) is sold (power sale) to an electric power company.

  When power from a relatively large power storage device of an electric vehicle or the like is supplied to a load such as a house, there is almost no need to supply power from the solar power generation unit to the load. The majority of the power from will be sold. Thus, a situation (so-called surplus increase in surplus power) occurs as if the surplus power generated in the photovoltaic power generation unit has increased. In such a situation where surplus power has been raised, for example, when charging a midnight power to a power storage device such as an electric vehicle, the midnight power with a low unit price is actually sold at a high unit price. Is unreasonable. Therefore, in such a power supply system, it is assumed in advance that the surplus power will rise, and the purchase price of the surplus power is uniformly reduced.

  However, since electric vehicles and the like are movable, surplus power is often not raised during the daytime when they often go out. Nevertheless, the above-described power supply system is disadvantageous in that the unit price of surplus power can be reduced uniformly.

JP 2012-39832 A

  The present invention has been made in view of the situation as described above, and the problem to be solved is that it is possible to prevent the surplus power from being raised, and it is therefore necessary to uniformly reduce the purchase price of the surplus power. There is no power supply system.

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

  That is, in claim 1, a power generation unit capable of generating power using natural energy, a distribution board for distributing power to a load, a first power path connected to the power generation unit and a commercial power source, and A second power path connected to the distribution board, a third power path capable of connecting a power storage device, and either the first power path or the third power path can be connected to the second power path Switch, a bypass power path that connects the first power path and the second power path without going through the switch, and a first switch that is provided in the bypass power path and switches whether power can be distributed. And a second switch that is provided between a connection part of the second power path with the changeover switch and a connection part of the bypass power path, and switches whether or not power can be distributed. When power is generated in the power generation unit, or when the power storage device is not connected to the third power path, power can be distributed through the first switch, and through the second switch. Disabling power distribution makes it impossible to supply power from the third power path to the distribution board, power generation is not performed in the power generation unit, and the power storage device is connected to the third power path. Only when it is connected to the first switch, disabling the distribution of power through the first switch, and enabling the distribution of power through the second switch, the connected to the third power path The power of the power storage device can be supplied to the distribution board via the changeover switch.

  In claim 2, in an emergency in which power from the commercial power supply cannot be supplied, the power flow through the first switch is disabled and the power flow through the second switch is enabled. The power of the power storage device connected to the third power path can be supplied to the distribution board via the changeover switch.

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

  In claim 1, by making it possible to supply power from the power storage device to the distribution board only when power generation is not performed in the power generation unit and the power storage device is connected to the third power path, It is possible to prevent the surplus power from being raised. As a result, it is not necessary to uniformly reduce the purchase price of surplus power.

  According to the second aspect of the present invention, the electric power from the power storage device can be effectively utilized in an emergency where the electric power from the commercial power source cannot be supplied.

1 is a block diagram showing an overall configuration of a power supply system according to an embodiment of the present invention. The figure which showed the flowchart of control of a 1st switch and a 2nd switch. The figure which showed a mode that electric power was supplied to the distribution board in the state in which the 1st switch was switched to ON. The figure which showed a mode that the electric power from a vehicle-mounted power storage device is supplied to a distribution board at the time of a power failure. The figure which showed a mode that the electric power from a commercial power source was supplied to the distribution board in the state in which electric power generation is not made in the solar power generation part. The figure which showed a mode that the electric power from a vehicle-mounted electrical storage apparatus was supplied to the distribution board in the state in which electric power generation is not made in the solar power generation part.

  Below, the structure of the electric power supply system 1 which concerns on one Embodiment of this invention is demonstrated using FIG.

  The power supply system 1 is provided in a house or the like, and appropriately supplies power from a commercial power source 200, power generated using sunlight, and the like to a load (in-home load) 300. The power supply system 1 mainly includes a photovoltaic power generation unit 10, a first power conditioner 20, an in-vehicle power storage device 30, a second power conditioner 40, a distribution board 50, a first power path 60, a second power path 70, A third power path 80, a switch unit 90, a bypass power path 100, a first switch 110, a second switch 120, a photovoltaic power generation detection sensor 130, a power storage device detection sensor 140, and a control device 150 are provided.

  The solar power generation unit 10 is an embodiment of the power generation unit according to the present invention. The solar power generation unit 10 is a device that generates power using sunlight, and includes a solar cell panel or the like. The solar power generation unit 10 is installed in a sunny place such as on the roof of a house, for example.

  The first power conditioner 20 includes an inverter circuit (not shown) and the like, and converts power appropriately. Specifically, the first power conditioner 20 is connected to the solar power generation unit 10, converts the DC power generated in the solar power generation unit 10 into AC power, and outputs the AC power.

  The in-vehicle power storage device 30 is composed of a lithium ion battery or the like and is mounted on an electric vehicle (EV) that is a traveling body. The in-vehicle power storage device 30 is a relatively large (large capacity) power storage device that supplies electric power for running an electric vehicle. The in-vehicle power storage device 30 can charge power and can discharge the charged power.

  The second power conditioner 40 includes an inverter circuit (not shown) and the like, and converts power appropriately. Specifically, the second power conditioner 40 can be connected to the in-vehicle power storage device 30 and converts the DC power from the in-vehicle power storage device 30 into AC power and outputs it.

  The distribution board 50 distributes the supplied power to loads 300, 300,. The distribution board 50 is connected to loads 300, 300,..., Which will be described later, and can distribute power according to the demand (power consumption) of the loads 300, 300,.

  Here, the loads 300, 300,... Are circuits to which electrical appliances that consume electric power are connected in the house or the like. The loads 300, 300,... Are provided, for example, for each room or for each outlet dedicated to a device that consumes a large amount of power. The loads 300, 300... Are connected to the distribution board 50, respectively.

  The 1st electric power path | route 60 is a path | route for distribute | circulating electric power comprised with the conducting wire etc. As shown in FIG. The first power path 60 is connected to the photovoltaic power generation unit 10 via the first power conditioner 20 and to the commercial power source 200.

  The second power path 70 is a path for distributing power, which is configured by a conductive wire or the like. The second power path 70 is connected to the distribution board 50.

  The third power path 80 is a path configured to circulate power, which is composed of a conductive wire or the like. The third power path 80 can be connected to the in-vehicle power storage device 30 via the second power conditioner 40.

  The switch unit 90 is a part that switches a power distribution route. The switch unit 90 is connected to the first power path 60, the second power path 70, and the third power path 80, respectively. The switch unit 90 mainly includes a changeover switch 91.

  The changeover switch 91 switches the power distribution route. Specifically, the changeover switch 91 can be switched to a state where the first power path 60 and the second power path 70 are connected, or a state where the third power path 80 and the second power path 70 are connected.

The changeover switch 91 is changed by a resident such as a house provided with the power supply system 1 or another person using the power supply system 1.
Specifically, when the resident or the like does not wish to supply the power from the in-vehicle power storage device 30 to the distribution board 50 (that is, distributes the power from the solar power generation unit 10 and the commercial power source 200). When it is desired to supply to the electrical panel 50), the changeover switch 91 is switched to a state in which the first power path 60 and the second power path 70 are connected.
Moreover, when the said resident etc. desires to supply the electric power from the vehicle-mounted power storage device 30 to the distribution board 50 (namely, the electric power from the solar power generation part 10 and the commercial power source 200 is supplied to the distribution board 50). The switch 91 is switched to a state in which the third power path 80 and the second power path 70 are connected.

  The bypass power path 100 is a path for distributing power, which is composed of a conducting wire or the like. One end of the bypass power path 100 is connected to the first power path 60. The other end of the bypass power path 100 is connected to the second power path 70.

  The first switch 110 switches whether power can be distributed. The first switch 110 is provided in the middle of the bypass power path 100. When the first switch 110 is switched on, power can flow through the first switch 110, and when the first switch 110 is switched off, power cannot flow through the first switch 110.

  The second switch 120 switches whether power can be distributed. The second switch 120 is provided in the middle of the second power path 70. More specifically, the second switch 120 is provided between the connection part between the second power path 70 and the switch unit 90 and the connection part between the second power path 70 and the bypass power path 100. When the second switch 120 is switched on, power can flow through the second switch 120, and when the second switch 120 is switched off, power cannot flow through the second switch 120.

  The photovoltaic power generation detection sensor 130 detects whether the photovoltaic power generation unit 10 is generating power. The photovoltaic power generation detection sensor 130 is provided in the first power path 60. More specifically, the photovoltaic power generation detection sensor 130 is provided in the vicinity of the connection portion between the first power path 60 and the first power conditioner 20. The photovoltaic power generation detection sensor 130 detects whether power is being generated in the photovoltaic power generation unit 10 by detecting power supplied from the photovoltaic power generation unit 10 via the first power conditioner 20. Can do.

  The power storage device detection sensor 140 detects whether the in-vehicle power storage device 30 is connected to the second power conditioner 40. The power storage device detection sensor 140 is provided in the third power path 80. The power storage device detection sensor 140 detects power supplied from the in-vehicle power storage device 30 via the second power conditioner 40, so that the in-vehicle power storage device 30 is connected to the second power conditioner 40. Can be detected.

  The control device 150 manages information in the power supply system 1 and controls the operation of each device. The control device 150 includes a storage unit such as a RAM and a ROM, an arithmetic processing unit such as a CPU, and the like.

  The control device 150 is connected to the first switch 110 and the second switch 120 (not shown), respectively, and can control the operation (ON / OFF switching) of the first switch 110 and the second switch 120. At this time, the control device 150 ensures that the ON / OFF states of the first switch 110 and the second switch 120 are always in conflict (that is, when one is ON, the other is always OFF). ) Control exclusively.

  The control device 150 is connected to the solar power generation detection sensor 130 and the power storage device detection sensor 140, respectively, and can receive information on the power detected by the solar power generation detection sensor 130 and the power storage device detection sensor 140.

  The control device 150 is connected to other units of the power supply system 1 (not shown), and can acquire and manage information regarding the power supply system 1.

  Next, control modes of the first switch 110 and the second switch 120 by the control device 150 in the power supply system 1 configured as described above will be described with reference to FIG.

In step S101, the control device 150 determines whether or not a power failure has occurred (in an emergency). That is, the control device 150 determines whether or not the power from the commercial power source 200 is in a state where it cannot be supplied for some reason. The determination can be performed using a sensor or the like that detects power from the commercial power source 200.
When determining that a power failure has occurred, the control device 150 proceeds to step S104.
When it is determined that a power failure has not occurred, the control device 150 proceeds to step S102.

In step S <b> 102, the control device 150 determines whether the solar power generation unit 10 is not generating power and the in-vehicle power storage device 30 is connected to the second power conditioner 40.
When it is determined that the photovoltaic power generation unit 10 is not generating power and the in-vehicle power storage device 30 is connected to the second power conditioner 40, the control device 150 proceeds to step S104.
When the control device 150 determines that the photovoltaic power generation unit 10 is generating power or the in-vehicle power storage device 30 is not connected to the second power conditioner 40, the control device 150 proceeds to step S103.

In step S103, the control device 150 switches the first switch 110 to ON and the second switch 120 to OFF.
After performing the process of step S103, the control device 150 performs the process of step S101 again.

On the other hand, in step S104, the control device 150 switches the first switch 110 to OFF and the second switch to ON.
After performing the process of step S104, the control device 150 performs the process of step S101 again.

  Hereinafter, the power supply mode when the first switch 110 and the second switch 120 are controlled by the control device 150 will be described with reference to FIGS. 2 to 7.

  First, a power supply mode when the control device 150 switches the first switch 110 to ON and the second switch 120 to OFF (step S103 in FIG. 2) will be described.

  As described above, no power failure has occurred (step S101 in FIG. 2), the solar power generation unit 10 is generating power, or the in-vehicle power storage device 30 is connected to the second power conditioner 40. If not (step S102 in FIG. 2), the control device 150 switches the first switch 110 to ON and the second switch 120 to OFF (step S103 in FIG. 2).

  As shown in FIG. 3, in this case, the power from the photovoltaic power generation unit 10 and the power from the commercial power source 200 are distributed through the first power path 60, the bypass power path 100, and the second power path 70 in order. Supply to the board 50 is possible. A resident or the like can use the load 300 using the supplied power.

  Further, when the amount of power from the solar power generation unit 10 exceeds the amount of power used by the load 300, the surplus power (surplus power) is allowed to flow backward to the commercial power source 200 and sold to the power company (power sale) )can do.

  In this state, as shown in FIG. 3, the in-vehicle power storage device 30 mounted on the electric vehicle is connected to the second power conditioner 40, and the changeover switch 91 is connected to the second power path 70 and the third power by a resident or the like. Even if it is switched to connect to the power path 80 (a resident or the like wishes to supply power from the in-vehicle power storage device 30 to the distribution board 50), the second switch 120 is turned off. Therefore, the power from the in-vehicle power storage device 30 is not supplied to the distribution board 50.

  That is, in this state, the surplus power generated in the solar power generation unit 10 is increased by supplying power from the in-vehicle power storage device 30 to the distribution board 50 (so-called surplus power raising). Will not occur. Therefore, in such a power supply system 1, it is not necessary to uniformly reduce the purchase unit price of surplus power on the assumption that the surplus power will rise.

  Next, the power supply mode when the control device 150 switches the first switch 110 to OFF and the second switch 120 to ON (step S104 in FIG. 2) will be described.

  As described above, when a power failure occurs (in an emergency) (step S101 in FIG. 2), the control device 150 switches the first switch 110 to OFF and the second switch 120 to ON (FIG. 2). 2 step S104).

  In this state, as shown in FIG. 4, when the changeover switch 91 is switched to connect the third power path 80 and the second power path 70 by a resident or the like, it is connected to the second power conditioner 40. The electric power from the in-vehicle power storage device 30 can be supplied to the distribution board 50 through the third power path 80, the switch unit 90, and the second power path 70 in order. A resident or the like can use the load 300 using the supplied power. In this case, since the first power path 60 and the second power path 70 are not connected, the power from the solar power generation unit 10 is not supplied to the distribution board 50.

  Even if the changeover switch 91 is switched to connect the first power path 60 and the second power path 70 by a resident or the like, the commercial power source 200 is out of power, and at the time of the power outage, the photovoltaic power generation unit Since no power is generated by 10, no power is supplied to the distribution board 50.

  Thus, in an emergency (when a power failure occurs), even if the power from the in-vehicle power storage device 30 can be supplied to the distribution board 50, the power from the photovoltaic power generation unit 10 is sold. As a result, there is no increase in surplus power. Therefore, in such a power supply system 1, it is not necessary to uniformly reduce the purchase unit price of surplus power on the assumption that the surplus power will rise. In an emergency, the electric power from the in-vehicle power storage device 30 can be supplied to the distribution board 50, so that the electric power can be effectively used.

  Further, as described above, the control device is also used when the photovoltaic power generation unit 10 is not generating power and the in-vehicle power storage device 30 is connected to the second power conditioner 40 (step S102 in FIG. 2). 150 switches the first switch 110 to OFF and the second switch 120 to ON (step S104 in FIG. 2).

  In this state, as shown in FIG. 5, when the changeover switch 91 is switched to connect the first power path 60 and the second power path 70 by a resident or the like, the power from the commercial power source 200 is The one power path 60, the switch unit 90, and the second power path 70 are circulated in order and can be supplied to the distribution board 50. A resident or the like can use the load 300 using the supplied power. In this case, since the third power path 80 and the second power path 70 are not connected, even if the in-vehicle power storage device 30 is connected to the second power conditioner 40, the power from the in-vehicle power storage device 30 Is not supplied to the distribution board 50.

  In addition, as shown in FIG. 6, when the changeover switch 91 is switched to connect the third power path 80 and the second power path 70 by a resident or the like, the vehicle mounted on the second power conditioner 40 Electric power from the power storage device 30 can be supplied to the distribution board 50 through the third power path 80, the switch unit 90, and the second power path 70 in order. A resident or the like can use the load 300 using the supplied power. In this case, since the first power path 60 and the second power path 70 are not connected, the power from the commercial power source 200 is not supplied to the distribution board 50.

  As described above, when the solar power generation unit 10 is not generating power and the in-vehicle power storage device 30 is connected to the second power conditioner 40, the power from the in-vehicle power storage device 30 is divided. Even if the power can be supplied to the panel 50, the power from the solar power generation unit 10 is not sold, so that the surplus power does not rise. Therefore, in such a power supply system 1, it is not necessary to uniformly reduce the purchase unit price of surplus power on the assumption that the surplus power will rise. In such a case, by making it possible to supply power from the in-vehicle power storage device 30 to the distribution board 50, the power can be used effectively.

As described above, the power supply system 1 according to the present embodiment is
A solar power generation unit 10 (power generation unit) capable of generating power using natural energy;
A distribution board 50 for distributing power to the load 300;
A first power path 60 connected to the photovoltaic power generation unit 10 and the commercial power source 200;
A second power path 70 connected to the distribution board 50;
A third power path 80 to which the in-vehicle power storage device 30 (power storage device) can be connected;
A change-over switch 91 that can connect either the first power path 60 or the third power path 80 and the second power path 70;
A bypass power path 100 that connects the first power path 60 and the second power path 70 without going through the changeover switch 91;
A first switch 110 that is provided in the bypass power path 100 and switches whether power can be distributed;
A second switch 120 provided between a connection part of the second power path 70 with the changeover switch 91 and a connection part of the bypass power path 100, and for switching the power distribution;
Comprising
When power is generated in the solar power generation unit 10 or when the in-vehicle power storage device 30 is not connected to the third power path 80, power can be distributed via the first switch 110, and By disabling the distribution of power through the two switches 120, the power from the third power path 80 cannot be supplied to the distribution board 50,
Only when the photovoltaic power generation unit 10 is not generating power and the in-vehicle power storage device 30 is connected to the third power path 80, the power distribution through the first switch 110 is disabled and the first By allowing power to flow through the two switches 120, the power of the in-vehicle power storage device 30 connected to the third power path 80 can be supplied to the distribution board 50 via the changeover switch 91. is there.

  As described above, the distribution board 50 distributes the electric power from the in-vehicle power storage device 30 only when the solar power generation unit 10 is not generating power and the in-vehicle power storage device 30 is connected to the third power path 80. It is possible to prevent the surplus power from rising. As a result, it is not necessary to uniformly reduce the purchase price of surplus power.

In addition, the power supply system 1
In an emergency in which power from the commercial power source 200 cannot be supplied, the power distribution through the first switch 110 is disabled and the power distribution through the second switch 120 is enabled. The electric power of the connected in-vehicle power storage device 30 can be supplied to the distribution board 50 via the changeover switch 91.

  With this configuration, it is possible to effectively use the power from the in-vehicle power storage device 30 in an emergency where the power from the commercial power source 200 cannot be supplied.

  In the present embodiment, the control device 150 controls the operations of the first switch 110 and the second switch 120, but the present invention is not limited to this. For example, the first switch 110 and the second switch 120 may be configured to operate based on electric power from the commercial power supply 200 using magnet switches (electromagnetic switches).

  Moreover, in this embodiment, although the solar power generation part 10 which generate | occur | produces electricity using sunlight was illustrated as a power generation part which can generate electric power using natural energy, this invention is not limited to this, For example, It may generate electricity using other natural energy such as wind power.

  In the present embodiment, the photovoltaic power generation detection sensor 130 and the power storage device detection sensor 140 detect power, but the present invention is not limited to this. That is, the solar power generation detection sensor 130 and the power storage device detection sensor 140 each determine whether power is generated in the solar power generation unit 10, whether the in-vehicle power storage device 30 is connected to the second power conditioner 40, For example, a voltage or current may be detected as long as it can be detected.

1 Power supply system 10 Solar power generation unit (power generation unit)
30 On-vehicle power storage device (power storage device)
50 distribution board 60 first power path 70 second power path 80 third power path 90 switch unit 91 changeover switch 100 bypass power path 110 first switch 120 second switch 200 commercial power supply 300 load

Claims (2)

A power generation unit capable of generating power using natural energy;
A distribution board that distributes power to the load;
A first power path connected to the power generation unit and the commercial power source;
A second power path connected to the distribution board;
A third power path to which the power storage device can be connected;
A changeover switch capable of connecting either the first power path or the third power path and the second power path;
A bypass power path connecting the first power path and the second power path without going through the changeover switch;
A first switch that is provided in the bypass power path and switches whether power can be distributed;
A second switch that is provided between a connection portion of the second power path with the changeover switch and a connection portion of the bypass power path, and switches whether power can be distributed;
Comprising
When power is generated in the power generation unit, or when the power storage device is not connected to the third power path, power can be distributed through the first switch, and the second switch By disabling the distribution of power through, it is impossible to supply power from the third power path to the distribution board,
Only when power generation is not performed in the power generation unit and the power storage device is connected to the third power path, the power distribution through the first switch is disabled, and the second switch is By enabling the distribution of power through, it is possible to supply the power of the power storage device connected to the third power path to the distribution board via the changeover switch,
Power supply system. In an emergency in which power from the commercial power supply cannot be supplied, the power distribution through the first switch is disabled and the power distribution through the second switch is enabled. The power of the connected power storage device can be supplied to the distribution board via the changeover switch.
The power supply system according to claim 1.

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