JP2014192964A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system which allows for enhancement of convenience, by combining a system interconnecting storage battery system with a non-system interconnecting storage battery system.SOLUTION: A power supply system 1 includes a photovoltaic power generation unit 10, a system interconnecting storage battery system 30 capable of supplying power to loads, and a non-system interconnecting storage battery system 40 capable of supplying power to a specific load 300 in the loads mentioned above. The power supply system 1 can supply power to the loads mentioned above, while apparently charging or discharging power from the photovoltaic power generation unit 10 and a commercial power supply 200. In a case of emergency where power from the commercial power supply 200 cannot be supplied, power charged in the non-system interconnecting storage battery system 40 is supplied automatically to the specific load 300, and when the power charged in the non-system interconnecting storage battery system 40 is reduced to a predetermined level or below, power charged in the system interconnecting storage battery system 30 can be supplied to the specific load 300.

Description

  The present invention relates to a technology of a power supply system that includes a power generation unit capable of generating power using natural energy and a storage battery system that has a storage battery that stores power and can supply power to a load.

  2. Description of the Related Art Conventionally, a technology of a power supply system including a power generation unit that can generate power using natural energy and a storage battery system that has a storage battery that stores power and can supply power to a load has become publicly known. ing. For example, as described in Patent Document 1.

  The power supply system described in Patent Document 1 has a so-called non-system-connected storage battery system, and in the event of a power failure (emergency), power from the power generation unit (solar power generation unit) is stored in the storage battery (power storage device). Electric power can be discharged (supplied) from the storage battery to a specific load while being charged. Thereby, the electric power generated in an emergency can be used efficiently.

  However, when such a non-system-connected storage battery system is used, in a situation where power generation in the power generation unit such as at night is impossible, the storage battery continues to discharge without being charged. However, it was disadvantageous in that it was limited and inconvenient.

JP 2013-31339 A

  The present invention has been made in view of the above situation, and the problem to be solved is to improve convenience by combining a grid-connected storage battery system with a non-system-connected storage battery system. It is to provide a power supply system capable of achieving the above.

  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 storage battery that stores power, a grid-connected storage battery system that can supply power to a load, and power A non-system interconnection storage battery system having a storage battery for storing and capable of supplying power to a specific load among the loads, and appropriately charging or discharging the power from the power generation unit and the commercial power source However, in the case of an emergency in which power from the commercial power supply cannot be supplied, the power charged in the non-system interconnection storage battery system is supplied to a specific load. When automatically supplied and the power charged in the non-system-connected storage battery system decreases below a predetermined value, the power charged in the system-connected storage battery system is supplied to the specific load. But Those which are function.

  According to a second aspect of the present invention, in the event of an emergency, when only the electric power charged in the non-system interconnection storage battery system is supplied to the specific load, the electric power generated in the power generation unit is It charges a system type storage battery system.

  According to a third aspect of the present invention, surplus power that is generated by the power generation unit and cannot be charged in the non-system-connected storage battery system is charged in the system-connected storage battery system.

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

  In claim 1, in addition to the power charged in the non-system-connected storage battery system, the power charged in the system-connected storage battery system can be supplied to a specific load, thereby continuing for a longer time. Thus, power can be supplied to a specific load, and convenience can be improved.

  In claim 2, since necessary power can be appropriately supplied to a specific load while charging the non-system interconnection storage battery system with the power generated in the power generation unit, the power generated in an emergency is It can be used efficiently.

  According to the third aspect, the electric power generated in an emergency can be used efficiently without being wasted.

1 is a block diagram showing an overall configuration of a power supply system according to an embodiment of the present invention. The block diagram which showed the supply aspect of the electric power in normal time. The block diagram which showed a mode that a non-system connection type | formula storage battery system discharges while charging in an emergency. The block diagram which showed a mode that a non-system connection type | formula storage battery system performed only discharge in emergency. The block diagram which showed a mode that the grid connection type storage battery system started discharge in an emergency. The block diagram which showed a mode that charge also to a grid connection type | formula storage battery system in emergency.

  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). The power supply system 1 mainly includes a photovoltaic power generation unit 10, a distribution board 20, a grid-connected storage battery system 30, a non-system-connected storage battery system 40, and the like.

  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, which is natural energy, and is configured by 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 solar power generation unit 10 is connected to the first power conditioner 11.

The first power conditioner 11 includes a DC / AC inverter (not shown) and the like, and converts power appropriately. Specifically, the first power conditioner 11 converts the DC power generated in the solar power generation unit 10 into AC power by the DC / AC inverter and outputs the AC power.
In addition, the first power conditioner 11 has an operation changeover switch (not shown) for switching ON and OFF of the “self-sustaining operation mode” at the time of a power failure (emergency when the power from the commercial power supply 200 cannot be supplied). In addition to being provided, an emergency outlet (not shown) from which power can be taken out when the self-sustaining operation mode is ON is provided. The emergency outlet is connected to a first switch 44 described later.

  The distribution board 20 distributes the supplied power to a load (not shown). The distribution board 20 is connected to the commercial power source 200 and the first power conditioner 11. The distribution board 20 is connected to each of the loads, and can distribute power according to the demand (power consumption) of the load.

  Here, the load is a circuit to which an electric appliance that consumes electric power in the house or the like is connected. The load is provided, for example, for each room or for each outlet dedicated to a device that consumes a large amount of power. The loads are connected to the distribution board 20 respectively.

  The grid-connected storage battery system 30 is a system that can charge and discharge electric power, and is operated in a state of being connected to a commercial power source 200 (an electric power system of an electric power company). More specifically, the grid-connected storage battery system 30 is connected to the commercial power source 200 while being connected to the commercial power source 200, and can supply power to all loads in the house or the like. . The grid-connected storage battery system 30 mainly includes a storage battery 31 and a second power conditioner 32.

  The storage battery 31 is configured to be able to charge and discharge electric power. The storage battery 31 is composed of a lithium ion battery.

The second power conditioner 32 includes a DC / DC converter (not shown), a bidirectional inverter, and the like, and converts power appropriately. The second power conditioner 32 is connected to the storage battery 31 and the distribution board 20. The second power conditioner 32 can convert the AC power supplied from the commercial power source 200 or the solar power generation unit 10 through the distribution board 20 into DC power and charge the storage battery 31. More specifically, the second power conditioner 32 transforms AC power supplied from the commercial power supply 200 or the solar power generation unit 10 via the distribution board 20 to an appropriate voltage by the DC / DC converter. Can be charged into the storage battery 31 by being converted into AC power by the bidirectional inverter. The second power conditioner 32 can convert the DC power from the storage battery 31 into AC power and supply (discharge) it to the distribution board 20. More specifically, the second power conditioner 32 converts the DC power from the storage battery 31 into AC power by the bidirectional inverter, and then transforms the DC power into an appropriate voltage by the DC / DC converter. Can be supplied (discharged).
The second power conditioner 32 is connected to an emergency outlet of the first power conditioner 11. The second power conditioner 32 can charge the storage battery 31 with the power supplied from the solar power generation unit 10 via the first power conditioner 11.
In addition, the second power conditioner 32 has an operation changeover switch (not shown) for switching ON and OFF of the “self-sustaining operation mode” at the time of a power failure (emergency when the power from the commercial power supply 200 cannot be supplied). In addition to being provided, an emergency outlet (not shown) from which power can be taken out when the self-sustaining operation mode is ON is provided. The emergency outlet is connected to a third switch 46 described later.

  A switch (not shown) is provided between the second power conditioner 32 and the distribution board 20, and the second power conditioner 32 (the grid-connected storage battery system 30) and the commercial power source 200 are connected ( It is possible to switch to a parallel state) or a disconnected state (disconnected state).

  The non-system-connected storage battery system 40 is a system that can charge and discharge electric power, and is operated without being connected to the commercial power source 200. More specifically, the non-system-connected storage battery system 40 is not connected to the commercial power source 200 (unlike the system-connected storage battery system 30 described above), and some of the loads in the house or the like Electric power can be supplied to (a specific load 300 described later). The non-system-connected storage battery system 40 mainly includes a storage battery 41, a charger 42, a third power conditioner 43, a first switch 44, a second switch 45, a third switch 46, a charging switch 47, and a bypass switch 48. It has.

  The storage battery 41 is configured to be able to charge and discharge electric power. The storage battery 41 is composed of a lithium ion battery.

  The charger 42 includes an AC / DC converter (not shown) and the like, and is connected to the storage battery 41. The charger 42 converts the supplied AC power into DC power by the AC / DC converter and charges the storage battery 41.

  The third power conditioner 43 includes a DC / AC inverter (not shown) and the like, and converts power appropriately. The third power conditioner 43 is connected to the storage battery 41. The third power conditioner 43 can convert the DC power from the storage battery 41 into AC power by the DC / AC inverter and supply (discharge) the AC power to a specific load 300 described later.

  Here, the specific load 300 is a circuit to which an electric appliance or the like that consumes power in the house or the like is connected, and in particular, there is a high need to supply power in an emergency (power failure). For example, in the case of a house, an emergency outlet (for power failure) provided in the living room or lighting can be selected as the specific load 300. Although one specific load 300 is shown in the figure, a plurality of loads can actually be received.

  The first switch 44, the second switch 45, the third switch 46, the charging switch 47, and the bypass switch 48 are used to switch the power distribution. When each switch is switched ON, power can flow through the switch, and when each switch is switched OFF, power cannot flow through the switch.

The first switch 44 is provided in a portion where the power distribution path connected to the emergency outlet of the first power conditioner 11 is connected to the non-system interconnection storage battery system 40.
The second switch 45 is provided in a portion where the power distribution path connected to the distribution board 20 is connected to the non-system interconnection storage battery system 40.
The third switch 46 is provided at a portion where the power distribution path connected to the emergency outlet of the second power conditioner 32 is connected to the non-system interconnection storage battery system 40.
The charging switch 47 is provided in a power distribution path that connects the first switch 44, the second switch 45, the third switch 46, and the charger 42.
The bypass switch 48 is provided in a power distribution path that connects the first switch 44, the second switch 45, the third switch 46, and the specific load 300 so as to bypass the charger 42.

In the power supply system 1 configured as described above, information on each part is managed by a control device (not shown), and the operation of each part is automatically controlled by the control device.
For example, the control device relates to the presence / absence of power supply from the commercial power source 200 (that is, whether or not a power failure has occurred), the presence / absence of power generation in the solar power generation unit 10, and the remaining charge of the storage battery 31 and storage battery 41 Information is received from sensors of each unit and managed. In addition, the control device includes operations of the first switch 44, the second switch 45, the third switch 46, the charging switch 47, and the bypass switch 48, the first power conditioner 11, the second power conditioner 32, and the charging. The operation of the device 42 and the third power conditioner 43 can be controlled.

  Below, the supply mode of the electric power in the electric power supply system 1 comprised as mentioned above is demonstrated.

  First, with reference to FIG. 2, a power supply mode in a normal state, that is, in a state where no power failure has occurred and power from the commercial power source 200 can be supplied will be described.

  In a normal state, the second switch 45 and the bypass switch 48 are switched ON, and the first switch 44, the third switch 46, and the charging switch 47 are switched OFF.

  In this case, the electric power from the solar power generation unit 10 and the commercial power source 200 is supplied to the distribution board 20 and appropriately distributed to the load. At this time, if the electric power required by the load can be sufficiently provided by the electric power from the solar power generation unit 10, the supply of electric power from the commercial power source 200 (power purchase) is stopped to reduce the electric bill. Can be saved.

  In addition, the storage battery 31 of the grid-connected storage battery system 30 is appropriately charged with the power from the solar power generation unit 10 and the commercial power supply 200, and the power charged in the storage battery 31 is supplied to the distribution board 20 as appropriate. By charging the storage battery 31 with surplus power (surplus power) generated by the solar power generation unit 10 and not being used in the load, or power from the commercial power source 200 at midnight (electric power at low cost) , No power is wasted and electricity costs can be saved.

  The power supplied to the distribution board 20 can be supplied to the specific load 300 via the second switch 45 and the bypass switch 48. Furthermore, the electric power charged in the storage battery 41 of the non-system interconnection storage battery system 40 is also supplied to the specific load 300 as appropriate.

  In this way, during normal times, in addition to the power from the photovoltaic power generation unit 10 and the commercial power source 200, the power from the grid-connected storage battery system 30 can be supplied to the distribution board 20 (and thus the load). It is said. Furthermore, in addition to the power from the solar power generation unit 10, the commercial power source 200, and the grid-connected storage battery system 30, the power from the non-system-connected storage battery system 40 can be supplied to the specific load 300.

  Next, a power supply mode in an emergency will be described with reference to FIGS.

  As shown in FIG. 3, in an emergency, first, the first switch 44 and the charging switch 47 are switched ON, and the second switch 45, the third switch 46, and the bypass switch 48 are switched OFF.

  By switching the second switch 45 to OFF, the non-system interconnection storage battery system 40 and the commercial power source 200 are switched to a disconnected state (disconnected state). At this time, the grid-connected storage battery system 30 is also switched from the commercial power supply 200 (disconnected state).

  In this case, first, power from the storage battery 41 of the non-system-connected storage battery system 40 is supplied to the specific load 300. Thereby, even if a power failure occurs, the specific load 300 can be used immediately.

  In an emergency, the operation switching switches of the first power conditioner 11 and the second power conditioner 32 are operated by a user of the power supply system 1 (such as a resident of the house), and the independent operation mode is switched to ON. Thereby, the electric power from the photovoltaic power generation unit 10 can be taken out from the emergency outlet of the first power conditioner 11, and the electric power from the storage battery 31 of the grid-connected storage battery system 30 is supplied to the second power conditioner 32. It can be removed from the emergency outlet.

  In this state, when the solar power generation unit 10 can generate power, the power from the solar power generation unit 10 is not connected to the non-system-connected storage battery via the first switch 44, the charging switch 47, and the charger 42. The storage battery 41 of the system 40 is charged. That is, the storage battery 41 discharges the power according to the request of the specific load 300 while charging the power from the solar power generation unit 10, and supplies it to the specific load 300. In this way, by charging the storage battery 41 with the power from the solar power generation unit 10 and supplying the necessary power to the specific load 300, the power can be used efficiently.

  Next, as shown in FIG. 4, when power generation in the solar power generation unit 10 is stopped (for example, when sunlight cannot be obtained at night), the first switch 44 is switched OFF.

  Even in this case, the storage battery 41 of the non-system interconnection storage battery system 40 continues to supply power to the specific load 300. That is, in this case, the storage battery 41 cannot be charged, but the power previously charged in the storage battery 41 can be continuously supplied to the specific load 300. Therefore, the specific load 300 can be used even in an emergency and in a situation where the solar power generation unit 10 cannot generate power.

  When the discharge of the storage battery 41 (supply of power to the specific load 300) is continued in the state shown in FIG. 4, the power charged in the storage battery 41 decreases. When the power charged in the storage battery 41 decreases below a predetermined value, the third switch 46 and the bypass switch 48 are turned on and the charging switch 47 is turned off as shown in FIG. .

  The “predetermined value” of the electric power charged in the storage battery 41 is a value that can be arbitrarily set, but is set to a value that is large enough that the discharge of the storage battery 41 does not stop.

  In this case, power from the storage battery 31 of the grid-connected storage battery system 30 is supplied to the specific load 300 via the third switch 46 and the bypass switch 48. As described above, when the charge of the storage battery 41 of the non-system-connected storage battery system 40 decreases to a predetermined value or less, the power from the storage battery 31 of the system-connected storage battery system 30 is supplied to the specific load 300. Thus, the specific load 300 can be used further continuously.

  Moreover, in the state shown in FIG. 3 (a state in which the storage battery 41 of the non-system interconnection storage battery system 40 is discharging power to the specific load 300 while charging the power from the solar power generation unit 10). When the power supplied (charged) from the solar power generation unit 10 to the storage battery 41 is larger than the power supplied (discharged) from the storage battery 41 to the specific load 300, the power is generated in the solar power generation unit 10. All of the electric power cannot be charged in the storage battery 41, and it is left unnecessarily.

  Therefore, when the power charged in the storage battery 41 is larger than the discharged power and the storage battery 31 of the grid-connected storage battery system 30 is not fully charged (that is, there is still room for charging the power), As shown in FIG. 6, surplus power (surplus power) from the photovoltaic power generation unit 10 is transferred to the storage battery 31 of the grid-connected storage battery system 30 via the first power conditioner 11 and the second power conditioner 32. Charge. Thereby, the electric power generated in the solar power generation unit 10 can be efficiently used without wasting it.

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 sunlight (natural energy);
A grid-connected storage battery system 30 having a storage battery 31 for storing power and capable of supplying power to a load;
A non-system-connected storage battery system 40 having a storage battery 41 for storing power and capable of supplying power to a specific load 300 among the loads;
Comprising
A power supply system 1 that supplies power from the solar power generation unit 10 and the commercial power source 200 to the load while appropriately charging or discharging,
If an emergency occurs when power from the commercial power source 200 cannot be supplied,
Automatically supplying the electric power charged in the non-system interconnection storage battery system 40 to a specific load 300;
When the power charged in the non-system-connected storage battery system 40 is reduced to a predetermined value or less, the power charged in the system-connected storage battery system 30 can be supplied to the specific load 300. .

By comprising in this way, in addition to the electric power charged in the non-system interconnection type storage battery system 40, the electric power charged in the system connection type storage battery system 30 can be supplied to the specific load 300. Thus, power can be supplied to the specific load 300 continuously for a longer time, and convenience can be improved.
Further, by using the non-system interconnection storage battery system 40 connected in advance to a specific load, power can be automatically supplied to the specific load 300 in an emergency. As a result, the specific load 300 can be used before the self-sustaining operation mode of the first power conditioner 11 or the second power conditioner 32 is switched to ON.
Moreover, although the electric power charged in the non-system-connected storage battery system 40 can be supplied only to the specific load 300, the system-connected storage battery system 30 is combined in the power supply system 1 according to the present embodiment. Thus, the electric power charged in the grid-connected storage battery system 30 can be supplied to all loads (distribution panel 20) at normal times. As a result, a more convenient power supply system 1 can be provided.

In addition, the power supply system 1
In an emergency, when only the electric power charged in the non-system interconnection storage battery system 40 is supplied to the specific load 300, the electric power generated in the solar power generation unit 10 is used as the non-system interconnection storage battery system. 40 is charged.

By configuring in this way, necessary power can be appropriately supplied to the specific load 300 while charging the non-system interconnection storage battery system 40 with the power generated in the solar power generation unit 10. Electric power generated in an emergency can be used efficiently.
As described above, the grid-connected storage battery system 30 that can perform charging and discharging simultaneously is combined with the grid-connected storage battery system 30 that cannot charge and discharge simultaneously by providing the bidirectional inverter. Thus, power can be used efficiently.

In addition, the power supply system 1
The surplus power that is generated by the solar power generation unit 10 and cannot be charged in the non-system-connected storage battery system 40 is charged in the system-connected storage battery system 30.

  With this configuration, the power generated in an emergency can be used efficiently without being wasted.

In the present embodiment, the solar power generation unit 10 that generates power using sunlight is illustrated as a power generation unit that can generate power using natural energy. However, the present invention is not limited to this, for example, It may generate electricity using other natural energy such as wind power.
Further, in the present embodiment, the storage battery 31 and the storage battery 41 are lithium ion batteries, but the present invention is not limited to this, and may be other batteries (for example, a nickel metal hydride battery).
Moreover, although the operation | movement of each part (the 1st power conditioner 11, the 2nd power conditioner 32, etc.) of the electric power supply system 1 shall be controlled by the control apparatus which is not shown in figure, it is individually controlled by the control part which each part has. The configuration may be controlled.
Further, in the present embodiment, the operation of the operation changeover switch of the first power conditioner 11 and the second power conditioner 32 (that is, switching of the autonomous operation mode ON / OFF) is performed by the user of the power supply system 1. However, the present invention is not limited to this, and may be automatically switched by the control device or the like.

1 Power supply system 10 Solar power generation unit (power generation unit)
30 grid-connected storage battery system 31 storage battery 40 non-system linked storage battery system 41 storage battery 200 commercial power supply 300 specific load

Claims (3)

A power generation unit capable of generating power using natural energy;
A grid-connected storage battery system having a storage battery for storing power and capable of supplying power to a load;
A non-system-connected storage battery system having a storage battery for storing electric power and capable of supplying electric power to a specific load among the loads;
Comprising
A power supply system that supplies power to the load while appropriately charging or discharging power from the power generation unit and a commercial power source,
When the emergency from which the power from the commercial power source cannot be supplied,
Automatically supplying the electric power charged in the non-system interconnection storage battery system to a specific load;
When the power charged in the non-system-connected storage battery system is reduced to a predetermined value or less, the power charged in the system-connected storage battery system can be supplied to the specific load. Features
Power supply system. In an emergency, when only the electric power charged in the non-system interconnection storage battery system is supplied to the specific load, the non-system interconnection storage battery system is charged with the electric power generated in the power generation unit. It is characterized by
The power supply system according to claim 1. The surplus power that is generated by the power generation unit and cannot be fully charged in the non-system-connected storage battery system is charged in the system-connected storage battery system,
The power supply system according to claim 2.

Images